World of Ham Radio 1997/WOHR97_AmSoft_(1997-02-01).iso/usenets/1995_12/_homebre.txt

Text File | 1997-02-01 | 909KB | 22,715 lines

The World of Ham Radio CD-ROM



From Unknown Sun Dec 03 12:42:18 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.ahc.ameritech.com!ddsw1!news.mcs.net!van-bc!news.rmii.com!newsjunkie.ans.net!howland.reston.ans.net!gatech!newsfeed.internetmci.com!EU.net!peer-news.britain.eu.net!psinntp!psinntp!psinntp!psinntp!voder!nsc!news
From: "Al Koblinski  (W7XA)" <[e-mail]>
Subject: Re: Surface-mount JFETs?
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Organization: National Semiconductor, Santa Clara
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You can get SOT23 surface mount JFETs from National Semiconductor my
distributor Future Electronics (in Canada) readily.  They also have a
smaller retail / mail order operation.  They are in most major cities
and headquartered in Montreal (Pointe Claire).
Regards, Al




From Unknown Sun Dec 03 12:42:19 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!newsfeed.internetmci.com!EU.net!peer-news.britain.eu.net!psinntp!psinntp!psinntp!psinntp!voder!nsc!news
From: "Al Koblinski  (W7XA)" <[e-mail]>
Subject: Re: Mass Production of P.C. boards
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Organization: National Semiconductor, Santa Clara
References: <49fqke$[e-mail]>
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An outfit called Data Circuits in San Jose, CA probably can help.
[phone]
Regards, Al




From Unknown Sun Dec 03 12:42:20 1995
Newsgroups: rec.radio.amateur.homebrew
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From: "Al Koblinski  (W7XA)" <[e-mail]>
Subject: Re: Amp
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National Semiconductor has a variety of IC audio amps that can drive
speakers from a few 100 milliwats to 75 watts. Maybe LM4861 will do ya.
Regards, Al




From Unknown Sun Dec 03 12:42:21 1995
Path: news.epix.net!news.sprintlink.net!hookup!gatech2!usenet.eel.ufl.edu!agis!news.jersey.net!homer.alpha.net!pacifier!news
From: jgoecks <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: help homebrewing 1935 transmitter
Date: 1 Dec 1995 03:42:45 GMT
Organization: Pacifier BBS, Vancouver, Wa.  ([phone])
Lines: 21
Message-ID: <49ltjl$[e-mail]>
References: <49ii8r$[e-mail]>
NNTP-Posting-Host: ip76.van3.pacifier.com

[e-mail] (Jake Hellbach) wrote:
>
> Hello to all,
> I'm want  to build the single tube transmitter that is on the cover of
> the 1995 CQ radio classics calendar. In the article it says the radio
> was in a 1935 QST and I was wondering if anyone has this issue or some
> other construction article on this tx.






The transmitter was probably also published in the ARRL Amateur's
Handbook for a number of years, libraries are more likely to have
that than the old QST.




Jim


From Unknown Sun Dec 03 12:42:22 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!uwm.edu!homer.alpha.net!pacifier!news
From: jgoecks <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How do I keep my computer from spewing rf?
Date: 1 Dec 1995 03:49:48 GMT
Organization: Pacifier BBS, Vancouver, Wa.  ([phone])
Lines: 37
Message-ID: <49lu0s$[e-mail]>
References: <49leke$[e-mail]>
NNTP-Posting-Host: ip76.van3.pacifier.com

[e-mail] () wrote:
>
> I have tried to use my 2m radio with an antenna about 10' away from my
> computer and my radio next to my computer, but all I get is static from
> my computer (I can't even squelch it out)!!! What is the best way to rf
> proof my computer case? I was thinking of covering all of the plastic
> parts (front cover, etc.) with metal door screen and spraying with
> metallic paint (will this work?). I was also going to put torroids on the
> power connections. Is this a good plan of attack? Thanx in advance.
>
> --
> 73 & ttyl     Morgan Patterson



The most likely cause of computer interference is the cabling.  I use
my 2m radio next to my computer all the time with no trouble.  Try
a large ferrite bead on each cable going into the computer.

Make sure all computer case screws are tight.  If the screws are missing
like they are on 90% of computers that someone has been into several
times, the computer may spew forth vast quantities of RF.

If the computer passed the FCC Class B requirements in the US or
whatever you have as an equivalent, you should have no trouble.

Most IBM clone cases are metal, so further shielding shouldn't help
much.  I don't know about other types of computers.

If your 2m rig is a plug into the power outlet type, you may need to
use a different power circuit than the computer uses.


Cheers,


Jim Goecks WA7UKS


From Unknown Sun Dec 03 12:42:23 1995
Path: news.epix.net!news.sprintlink.net!newshub.cts.com!news1.crl.com!nntp.crl.com!howland.reston.ans.net!newsfeed.internetmci.com!uwm.edu!msunews!harbinger.cc.monash.edu.au!newsserver.trl.OZ.AU!pcies4.trl.OZ.AU!ddiamond
From: [e-mail] (Drew Diamond)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: AirDux coil source?
Date: Fri, 1 Dec 1995 11:07:13
Organization: TRL
Lines: 18
Distribution: world
Message-ID: <[e-mail]>
References: <49fld7$[e-mail]>
NNTP-Posting-Host: pc0126.trl.oz.au
Keywords: AirDux coils
X-Newsreader: Trumpet for Windows [Version 1.0 Rev Final Beta #7]

In article <49fld7$[e-mail]> [e-mail] (Cecil A. Moore~) writes:
>From: [e-mail] (Cecil A. Moore~)
>Subject: AirDux coil source?
>Date: 28 Nov 1995 18:45:59 GMT>Anybody know a source for AirDux coils? Any
other brand>of large coils?>thanks and 73, Cecil, KG7BK, OOTC  (not speaking
for my employer)

Cecil; Last time I ordered B&W coils (like AirDux) from Ocean State
Electronics RI, they were out of stock- although they are listed in my
current catalog. Ph 1-800-866-6626.

If you want to make your own; see if you can look up QST Dec.  1934 (yes,
1934) p41 - 42; "Low-Loss Low-Cost Transmitting Coils" by A. Muldoon W1FRQ.
Muldoon desribes how to make AirDux style coils from ordinary materials. He
uses a split wood mandrel for the winding former, and plastic supports.

73, Drew Diamond, VK3XU.



From Unknown Sun Dec 03 12:42:24 1995
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!howland.reston.ans.net!Germany.EU.net!zib-berlin.de!news.tu-chemnitz.de!irz401!news1.urz.tu-dresden.de!server2.rz.uni-leipzig.de!news.uni-jena.de!news.tu-ilmenau.de!prakinf2.PrakInf.TU-Ilmenau.DE!news.uni-stuttgart.de!moritz
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna
Subject: Re: Anyone know a source for Yagi antenna parts
Date: 1 Dec 1995 11:48:44 GMT
Organization: Comp.Center (RUS), U of Stuttgart, FRG
Lines: 15
Message-ID: <49mq2s$[e-mail]>
References: <49i6ih$[e-mail]>
NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de
Xref: news.epix.net rec.radio.amateur.homebrew:11820 rec.radio.amateur.antenna:17420

>I want to find a source for element-to-boom fittings so
>I can build some 2-Meter and 70-cm yagi antennas.  Is there
>any place or person that sells these?

Doug,

Suppliers of (amateur) antennas sell these over here. Maybe they do it also
at your end. However, one thing: you have too use exactly the type
of mounting specified in your design (through the boom, on top of the
boom, isolated or connected..). There are correction factors to the element
lengths for each method. A successful method is mounting the elements
isolated through the boom with nylon rivets.

73, Moritz DL5UH



From Unknown Sun Dec 03 12:42:25 1995
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!infoseek.com!uunet!in1.uu.net!EU.net!chsun!hslrswi!news
From: Trummer Egon <[e-mail]>
Subject: Wanted: Specs for VHF-power tube Philips YD1303
X-Nntp-Posting-Host: cae004.hasler.ascom.ch
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Xref: news.epix.net rec.radio.amateur.equipment:21979 rec.radio.amateur.homebrew:11835 rec.radio.amateur.misc:95014

Hallo


a friend has got a Philips VHF power tube YD1303 and he would
like to have some data sheet or hints where to find further information.
This tube was possibly intended for a PLISCH TV transmitter with
a few hundred watts at 400MHz.


Further informations would be appreciated very much.

73 de HB9HVI, Egon



From Unknown Sun Dec 03 12:42:26 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!ncar!ra.cgd.ucar.edu!tomas
From: [e-mail] (Bob Tomas)
Newsgroups: rec.radio.amateur.homebrew
Subject: receive overload with ts-520s
Date: 1 Dec 1995 16:19:46 GMT
Organization: Climate and Global Dynamics Division/NCAR, Boulder, CO
Lines: 28
Message-ID: <49n9v2$[e-mail]>
NNTP-Posting-Host: ra.cgd.ucar.edu


Hello all,

I have an old ts-520s and live in a neighborhood in which several other
amateurs operate.  Unfortunately, the ts-520s receiver doesn't like
it when there are strong signals present on the band it is tuned to.
It gets mad and the agc kicks in with a vengeance---even if the strong
signal is several 100 kHz away.

I've tried using the attenuator button (20 db); not surprisingly, this helps
a little.  I've also tried turning of the noise blanker (thanks to the reader
who provided the suggestion); not sure if this helps or not yet.  The less
than acceptable solution I've found is to disable the agc when it starts
throwing a tantrum.  I am in search of suggestions/answers:

1) Is this a well known problem with these old rigs?
2) Is there a mod that will/may  help?
3) If my poor uncle were to leave me several hundred dollars, are there used
   rigs out there that deal with strong signals better?
4) If my rich aunt were to leave me several thousand dollars, are there new
   rigs out there that deal with strong signals better?

By the way, I operate cw almost exclusively (as do my neighbors) and the
rig does not have the cw filter installed.

bob
n7nd



From Unknown Sun Dec 03 12:42:27 1995
Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!vixen.cso.uiuc.edu!usenet
From: [e-mail] (Ignacy Misztal)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: receive overload with ts-520s
Date: 1 Dec 1995 16:58:17 GMT
Organization: University of Illinois
Lines: 34
Message-ID: <49nc79$[e-mail]>
References: <49n9v2$[e-mail]>
Reply-To: [e-mail] (Ignacy Misztal)
NNTP-Posting-Host: misz.animal.uiuc.edu
X-Newsreader: IBM NewsReader/2 v1.02

In <49n9v2$[e-mail]>, [e-mail] (Bob Tomas) writes:
>
>Hello all,
>
>I have an old ts-520s and live in a neighborhood in which several other
>amateurs operate.  Unfortunately, the ts-520s receiver doesn't like
>it when there are strong signals present on the band it is tuned to.
>It gets mad and the agc kicks in with a vengeance---even if the strong
>signal is several 100 kHz away.

We had TS-520 and IC-735 side by side during the 1994 field day.
TS-520 showed strong intermods at 80m in the evening while 735 had
none, even with RF preamplifier on.

Most likely, the overloading element in TS-520 is the mixer. If the
mixer is base on MOSFET, perhaps substituting a different type with
higher power would help.

It is also possible that the quartz filter has insufficient
out-of-band attenuation.

One solution would be to rewind the RF input coils for higher Q. I
have seen it done on FT-101ZD, and the difference in intermods on 40m
was spectacular. This modification may not help you much if your
neighbors operate close to your frequency.

Perhaps the best choice would be to sell your TS-520 and buy
something more resistant to overloading, e.g.,  TS-830 or IC-735.

Ignacy Misztal              Ham radio: NO9E, SP8FWB
E-mail: [e-mail]
University Of Illinois      1207 W. Gregory Dr., Urbana, IL 61801, USA
tel. [phone]         Fax: [phone]



From Unknown Sun Dec 03 12:42:28 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!sparky.insinc.net!newsfeed.direct.ca!imci2!newsfeed.internetmci.com!in2.uu.net!spcuna!ritz!aolsz
From: [e-mail] (aolsz)
Subject: Computer Repair Web Site
Organization: Mordor International
Date: Fri, 1 Dec 1995 17:09:22 GMT
X-Newsreader: TIN [version 1.2 PL2]
Message-ID: <[e-mail]>
Lines: 16

COMPUTERCRAFT!
http://www.mordor.com/aolsz/

Dedicated to tech notes on the repair, maintenance, and upgrade of PCs.

The site is maintained by Anthony Olszewski, a professional technicain
with over ten years of experience with all makes and models of the IBM
systems and compatibles - from the original 8088 to the Pentium!

E-mail is [e-mail]

The physical address is 470 Grand Street, Jersey CIty, NJ  07302 USA

The phone numbers are 201-795-0909 and 201-946-1178




From Unknown Sun Dec 03 12:42:29 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!sdd.hp.com!col.hp.com!news.dtc.hp.com!hpscit.sc.hp.com!rkarlqu
From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: The N4TMI Desoldering Contest
Date: 1 Dec 1995 18:01:19 GMT
Organization: Hewlett-Packard
Lines: 16
Message-ID: <49nftf$[e-mail]>
References: <49abeq$[e-mail]> <49mbgn$[e-mail]>
NNTP-Posting-Host: hpscrj.scd.hp.com

In article <49mbgn$[e-mail]>, Wouter de Waal <[e-mail]> wrote:
>
>
>I often use a small profane torch to remove 244s and 245s from blown up
                     ^^^^^^^

>PC multi-io cards. I don't care if the board gets scorched. (It does,
>lemme tell you, I've had boards igniting, do this outside.)
>
>Wouter ZS1KE

Here we have coined a new technical term "profane" describing the
language used by the torch operator when the board catches on fire!

Rick N6RK :-)



From Unknown Sun Dec 03 12:42:30 1995
Path: news.epix.net!news.sprintlink.net!nuclear.microserve.net!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: How To Repair Ceramic Switch?
Date: Fri, 01 Dec 95 20:31:16 GMT
Organization: Microserve Information Systems (800)-380-INET
Lines: 15
Distribution: world
Message-ID: <49p361$[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

I have a ceramic switch wafer that I need to repair.  One of the
fingers is badly burned and melted away where it used to contact
the rotor.  The rotor itself looks OK.

The wafer is a standard size, a little over 2" diameter, and I have
other wafers I could salvage a finger from.  It's easy enough to
drill the head off the rivet and remove the finger, but how to mount
the new finger on the wafer?

Does anyone know if there's a specific size screw or other type of
hardware that can be used for this?

Tnx & 73,

Jack  WB3U


From Unknown Sun Dec 03 12:42:30 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.bctel.net!news.cyberstore.ca!van-bc!unixg.ubc.ca!news.bc.net!rover.ucs.ualberta.ca!news.sas.ab.ca!freenet.edmonton.ab.ca!morganp
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How do I keep my computer from spewing rf?
Date: 1 Dec 1995 22:39:32 GMT
Organization: Edmonton Freenet, Edmonton, Alberta, Canada
Lines: 13
Message-ID: <49o074$[e-mail]>
References: <49leke$[e-mail]> <49lufp$[e-mail]>
NNTP-Posting-Host: freenet.edmonton.ab.ca
X-Newsreader: TIN [version 1.2 PL2.3]

Thanx for all the replies. I have a plastic front on my case so I will
shield that. I will also replace all of the screws that are missing (8 of
them I think (there's actually on 1 screw holding the cover on!). I will
start with putting toroids on just the power cords and if doesn't cure it
I will put a toroid on ever single on of those cables (9 of 'em, I just
counted). Thanx again

--
73 & ttyl     Morgan Patterson
       \\///  Internet: [e-mail]
       (o o)  Ham Radio: VE6MRP
        (_)   "Ok, take your best shot. Aim well: I don't die easy"
----oOO-----OOo---------------------------------------------------------------


From Unknown Sun Dec 03 12:42:31 1995
Path: news.epix.net!news.sprintlink.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!vixen.cso.uiuc.edu!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (KA9EGW)
Newsgroups: rec.radio.amateur.homebrew
Subject: custom chassis/panels/cabinets built
Date: 2 Dec 1995 02:03:58 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 8
Sender: [e-mail]
Message-ID: <49otou$[e-mail]>
Reply-To: [e-mail] (KA9EGW)

Will build chassis, panels, cabinets, enclosures to your specifications
for your homebrew project.  Quality work, reasonable prices, 15 years'
experience building electronic prototypes.

Brian Sherwood KA9EGW
[e-mail]
TEL [phone]
FAX [phone]


From Unknown Sun Dec 03 12:42:32 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!harbinger.cc.monash.edu.au!news.uwa.edu.au!newsman.murdoch.edu.au!newsman.murdoch.edu.au!usenet
From: [e-mail] (Walter Howse)
Newsgroups: rec.radio.amateur.homebrew
Subject: DB6NT HEMT-PA for 24 Ghz
Date: 2 Dec 1995 08:50:33 GMT
Lines: 28
Message-ID: <[e-mail]>
NNTP-Posting-Host: cleo.murdoch.edu.au
X-Newsreader: WinVN 0.99.2
MIME-Version: 1.0

Advice is sought about the HEMT-PA design (10-93) by DB6NT and published
by DC0DA which uses a BAT15 diode to monitor power output.

Can anyone provide information about the impedance of the meter attached
to the BAT15 output monitor (eg 20 Kohm/volt) and what the range of
typical readings might be for particular power levels?

I am also chasing any Australian source of calibration of a waveguide
detector to get a better idea of where we are in the power stakes and of
a directional coupler suitable for measuring return loss.  Can any Aussie
reader please help?

Thanks

73

Wal
--
=========================================================================
=
Dr Walter J Howse                        | [e-mail]
4 Renton St                              | Phone + 61 9 317 2967
Melville                                 | Fax   + 61 9 317 3113
WA Australia  6156                       |
Amateur Radio Station VK6KZ  located OF77vw  Local time UTC + 8
=========================================================================
=



From Unknown Sun Dec 03 12:42:33 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: AirDux coil source?
Date: 2 Dec 1995 09:01:32 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 13
Sender: [e-mail]
Message-ID: <49pm7s$[e-mail]>
References: <49fld7$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <49fld7$[e-mail]>, [e-mail]
(Cecil A. Moore~) writes:

>Anybody know a source for AirDux coils? Any other brand
>of large coils?
>
>thanks and 73, Cecil, KG7BK, OOTC  (not speaking for my employer)
>
>

I have some Cecil.

Tom


From Unknown Sun Dec 03 12:42:34 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!server.iadfw.net!usenet
From: [e-mail] (Kerry Miller)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Kenwood TS-870
Date: Sat, 02 Dec 1995 14:32:04 GMT
Organization: Internet America
Lines: 22
Message-ID: <49po03$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: dal06-02.ppp.iadfw.net
X-Newsreader: Forte Free Agent 1.0.82

jkbe@zeus (John_Bednar) wrote:


>Can anyone offer some information on the new Kenwood TS-870 that
>uses DSP at the IF frequency.

>What's the IF frequency? Has it been reviewed in any of the
>magazines yet? Inpressions? Strong signal performance, etc.?

John,
     I believe the IF is way down at 11KHz, that's how they get the
DSP to work.  Lew McCoy did a good review of it in a recent magazine,
I think CQ, but it may have been 73.  Heard one on the air last week,
the guy sounded clean, but real bassy.  The dsp on transmit may take
more fine tuning than some people are willing to learn how to do.  I
know there is a similar option on my Yaesu FT-990 and if I set it up
wrong, I can sound pretty bad.  Looks like a great rig, though.
Wonder if the next generation will have the dsp in the 9 MHz IF???
Kerry, WD5ABC
[e-mail]




From Unknown Sun Dec 03 12:42:36 1995
Path: news.epix.net!news.sprintlink.net!oronet!news
From: [e-mail] (Jim Weir)
Newsgroups: rec.radio.amateur.homebrew
Subject: PC Board Prototyping - Ham Style
Date: Sat, 02 Dec 1995 15:34:54 GMT
Organization: RST Engineering
Lines: 25
Message-ID: <49q846$[e-mail]>
NNTP-Posting-Host: rst-engr.oro.net
X-Newsreader: Forte Free Agent 1.0.82


I'd like to get a thread started on the cheap and easy ways to do
prototype PC boards.  I started asking questions on the CAD newsgroups
and those folks are so bound up with workstations and thousand dollar
autorouter programs that they just don't understand those of us using
laser printers and fishtank etchers.  I've gotten some damned good
advice and some absolute trash.

My proposal is to start three threads:  PCB software, PCB resists, and
PCB etching.  If anybody objects to me starting these threads in this
newsgroup, say so now.  If anybody has other major topics they'd like
to add to the threads, say so now.

Otherwise on Monday morning...

Jim



Jim Weir VP Engineering  | "We seem to be standing on
RST Engineering          |  the foreskin of technology."
Grass Valley CA 95945    | (Gen Chuck Yeager)
voice/fax [phone]   |
[e-mail]  AR Adv WB6BHI  CFI A&G/Comml Inst A&G/A&P/C-182A N73CQ



From Unknown Sun Dec 03 12:42:37 1995
Path: news.epix.net!news.sprintlink.net!news.heurikon.com!uwvax!uwm.edu!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news
From: Sandy Blaize, W5TVW <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.swap
Subject: Need transistor data!!!
Date: 3 Dec 1995 05:12:32 GMT
Organization: Alligator Amateur Radio of the South
Lines: 20
Message-ID: <49rbk0$32l$[e-mail]>
Xref: news.epix.net rec.radio.amateur.homebrew:11837 rec.radio.swap:52154

I need some data on the following RF transistors.  All have
"house"
numbers on them.  They are in the "helicopter" type package.
185-4104P1 or 4104P1
185-104P1 OR 104P1
185-4164P2 OR 4164P2
185-9181P4 OR 9181P4
185-9181P3 OR 9181P3

I need Power input/output, frequency ratings, typical collector
voltage,
and Class of operation [Class C (FM) or linear service]  I think
these
are "GE" house numbers but I'm not sure.  Have several of each
type
unused.

73,
Sandy W5TVW
[e-mail]


From Unknown Fri Dec 08 19:15:31 1995
Path: news.epix.net!news.sprintlink.net!news.heurikon.com!news.ahc.ameritech.com!ddsw1!news.mcs.net!willis.cis.uab.edu!maze.dpo.uab.edu!info.uah.edu!news.msfc.nasa.gov!newsfeed.internetmci.com!in2.uu.net!brighton.openmarket.com!decwrl!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news
From: Zack Lau <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: (no subject)
Date: Wed, 06 Dec 1995 17:44:39 -0800
Organization: American Radio Relay League
Lines: 9
Message-ID: <[e-mail]>
NNTP-Posting-Host: mgate.arrl.org
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b3 (Win16; I)

> [e-mail] (Wassell, James T.,  Ph.D.) wrote:
> >use silver plated no. 10 or no. 8 wire.  Does anyone know where to buy

You might try asking for Teflon insulated wire.

Allied Electronics sells 500 ft of no. 10 silver plated copper wire
(37 strands of no. 26) for $445.  Phone [phone]

Zack KH6CP/1 [e-mail]


From Unknown Fri Dec 08 19:15:32 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: * Free Newsletter on Passion & Romance *
Date: 6 Dec 1995 09:49:29 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 9
Sender: [e-mail]
Message-ID: <4a4ahp$[e-mail]>
References: <4a2jsi$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <4a2jsi$[e-mail]>, [e-mail]
writes:

>1 SIZZLING love tip

Hmmm, define tip. I'm not sure I want one. Most of us males aren't
inclinded or equipped to enjoy such things, SIZZLING or not!.

Tom


From Unknown Fri Dec 08 19:15:33 1995
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!geraldo.cc.utexas.edu!usenet
From: Bruce Bostwick <[e-mail]>
Newsgroups: sci.electronics,rec.radio.amateur.homebrew
Subject: Re: 12VDC
Date: 8 Dec 1995 21:47:28 GMT
Organization: The University of Texas at Austin, Austin, Texas
Lines: 17
Message-ID: <4aabpg$[e-mail]>
References: <4a9qhe$[e-mail]> <[e-mail]>
NNTP-Posting-Host: pcl-a75.lib.utexas.edu
Xref: news.epix.net sci.electronics:161650 rec.radio.amateur.homebrew:11972

[e-mail] (Steve Work) wrote:
> Also, I do not think that 2^8 combinations is particularly un-secure.
> Remember that the potential intruder would have to not only try all 256
> codes but learn several other details such as frequency, encoding method,
> etc.  All of which make their job much more difficult.  If it were me , I
> would stick with what you know can get to work.

It's worth mentioning that around here, at least, there are people who
specialize in this type of burglary and apparently they're pretty good
at it -- we had a special on the news not too long ago about how easy
it was to break into houses with garage door openers.  I suspect that
most of the job nowadays is in the form of hardware you can buy from
people who sell shady quasi-legal stuff like this (nominally for
educational purposes only, of course, just like 1kW CB linears etc.)
so better not count on store-bought stuff for Fort Knox security ...

<BGB>  http://ccwf.cc.utexas.edu/~lihan/


From Unknown Fri Dec 08 19:15:34 1995
Path: news.epix.net!news.sprintlink.net!news.infi.net!usenet
From: [e-mail] (Richard Scott)
Newsgroups: sci.electronics,rec.radio.amateur.homebrew
Subject: 12VDC "Secure" Receiver/Transmitter Pair
Date: 8 Dec 1995 16:53:02 GMT
Organization: InfiNet
Lines: 26
Message-ID: <4a9qhe$[e-mail]>
Reply-To: [e-mail] (Richard Scott)
NNTP-Posting-Host: fiddle.nc5.infi.net
X-Newsreader: IBM NewsReader/2 v1.09
Xref: news.epix.net sci.electronics:161629 rec.radio.amateur.homebrew:11967


Time to throw a question "over the wall" as I've not been able to locate
a cost-effective, secure solution.

What I'm seeking is basically a short-range DC transmitter/receiver pair
that functions much like a garage door or gate opener (and in fact it is
the latter for which the pair will be used) that offers a fairly-high level
of security.  Note that 12VDC is all that's available to the receiver, as
the gear-motor driven gate is in a remote location (powered by lead-acid
batteries charged by solar panels).

The best thing I've found so far is certainly cost-effective but has only
2^8 combinations and thus isn't very secure.  Anybody got sources for
anything better or schematics or references?  (I'm a physicist -- not an
EE, so while I could ultimately [perhaps with great wailing & gnashing of
teeth] design something that would probably work, I'd much prefer something
_known_ to work!!!)

Thanks for any light anyone would care to shed on the subject

Richard

============================================================================
Mathematics is the science in which we do not know what we are talking about
and we do not care whether what we say about it is true -- Bertrand Russell



From Unknown Fri Dec 08 19:15:35 1995
Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!tir.com!news
From: [e-mail] (Gary Newberry)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 800 for Kenwood?
Date: Mon, 04 Dec 1995 07:59:56 GMT
Organization: The Internet Ramp
Lines: 26
Message-ID: <49u996$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: an6.tir.com
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] wrote:

>Anyone know a 800 number for Kenwood?  There is absolutly no number in any
>of my two users manual and I never got any reply from [e-mail].

>It's been over two months that I have a defective radio now and for a radio
>over 1000$ I think I can have a better way to reach the company.

>If you have a secret number you don't want to post in public then
>reply me at:  [e-mail]

>Thank you very much.

>                                    Internet:  [e-mail]
>                                      Packet:  VE2DLX@VE2SJC.#QBC.PQ.CAN.NA

Try 1-800 Kenwood,  for repair locations/parts .... you ever like look
at their ads in QST, 73  ?

Gary



--
[e-mail] <Gary>



From Unknown Fri Dec 08 19:15:36 1995
Path: news.epix.net!news.sprintlink.net!news1.is.net!news1.i1.net!news1.inlink.com!news.starnet.net!wupost!udel!gatech!newsfeed.internetmci.com!in2.uu.net!fonorola!Rezonet.net!qbc-clic!com18!daniel.lacasse
Newsgroups: rec.radio.amateur.homebrew
In-Reply-To: [e-mail]
Subject: 800 for Kenwood?
From: [e-mail]
Message-ID: <[e-mail]>
Date: Fri, 1 Dec 95 13:50:00 EST
Organization: Babillard COM18 BBS
Lines: 13

Anyone know a 800 number for Kenwood?  There is absolutly no number in any
of my two users manual and I never got any reply from [e-mail].

It's been over two months that I have a defective radio now and for a radio
over 1000$ I think I can have a better way to reach the company.

If you have a secret number you don't want to post in public then
reply me at:  [e-mail]

Thank you very much.

                                    Internet:  [e-mail]
                                      Packet:  VE2DLX@VE2SJC.#QBC.PQ.CAN.NA


From Unknown Fri Dec 08 19:15:37 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!nntp.primenet.com!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: 900 Mhz Homebrew
Date: 5 Dec 1995 01:33:09 GMT
Organization: Primenet Services for the Internet
Lines: 14
Message-ID: <4a07gl$[e-mail]>
NNTP-Posting-Host: usr4.primenet.com
NNTP-Posting-User: mattstr

Does anyone have any schematics for easy to build 902-928 Mhz receivers and/or
transmitters?? I just bought a 900 Mhz repeater but nobody in Arizona
has 900 yet...i'm going to tune the repeater down to the 33 cm ham band.
If anyone has schematics for these things, i would pay for copies of it
and postage costs to mail them to me.  Please help, if you can.

Thanks
Matt

--
-------------------------------------------------------------------------------
mattstr                                   __  __     ____  ___       ___ ____
[e-mail]                     /__)/__) / / / / /_  /\  / /_    /
                                        /   / \  / / / / /__ /  \/ /___  /-------------------------------------------------------------------------------


From Unknown Fri Dec 08 19:15:38 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!dish.news.pipex.net!pipex!bt!btnet!newsfeed.internetmci.com!news.kei.com!newsstand.cit.cornell.edu!newsfeed.cit.cornell.edu!news.tc.cornell.edu!newsserver.sdsc.edu!news.cerf.net!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news
From: Zack Lau <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 900 Mhz Homebrew
Date: Thu, 07 Dec 1995 09:28:04 -0800
Organization: American Radio Relay League
Lines: 18
Message-ID: <[e-mail]>
References: <4a07gl$[e-mail]>
NNTP-Posting-Host: mgate.arrl.org
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b3 (Win16; I)
To: [e-mail]

[e-mail] wrote:
>
> Does anyone have any schematics for easy to build 902-928 Mhz receivers and/or
> transmitters?? I just bought a 900 Mhz repeater but nobody in Arizona
> has 900 yet...i'm going to tune the repeater down to the 33 cm ham band.

You might consider the idea of plugging 2 meter H-Ts into transverters.

The July 1991 QST has a design that uses etched filters.  Its reprinted
in the ARRL UHF/Microwave Projects Manual.  If you need more than 20 mW,
it isn't too challenging to hook up a hybrid power module that will
boost the 20 mW to 10 or 15 watts.  A minor problem is the LO, it isn't
designed for precise frequency netting.  One approach is to use an HF
VXO and multiplier.  The use of two LOs can solve the problem of the
repeater offset, if the radio can't handle it.

Zack KH6CP/1    I've used helical filters to make a 903 transverter
[e-mail]   (4 dB NF/20 mW out) the size of a block of butter.


From Unknown Fri Dec 08 19:15:40 1995
Path: news.epix.net!news.sprintlink.net!clue.callamer.com!biggulp.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: AirDux coil source?
Date: Sun, 3 Dec 1995 17:44:14 -0800
Organization: CallAmerica, San Luis Obispo CA USA
Lines: 21
Message-ID: <[e-mail]>
References: <49fld7$[e-mail]> <49pm7s$[e-mail]>
NNTP-Posting-Host: biggulp.callamer.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
NNTP-Posting-User: cbuttsch
In-Reply-To: <49pm7s$[e-mail]>

Tom, most of the reamining Lumintronics coils that were built in
Sunnyvale, CA were purchased by B and W. Only the popular ones remain so
the selection is somewhat slim, but available.  Cliff Buttschardt W6HDO

On 2 Dec 1995, W8JI Tom wrote:

> In article <49fld7$[e-mail]>, [e-mail]
> (Cecil A. Moore~) writes:
>
> >Anybody know a source for AirDux coils? Any other brand
> >of large coils?
> >
> >thanks and 73, Cecil, KG7BK, OOTC  (not speaking for my employer)
> >
> >
>
> I have some Cecil.
>
> Tom
>
>


From Unknown Fri Dec 08 19:15:41 1995
Path: news.epix.net!news.sprintlink.net!shore4.intercom.net!usenet
From: "Steven A. Bailey" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Book by Kenneth Cornell?
Date: 8 Dec 1995 03:51:46 GMT
Organization: NASA
Lines: 7
Message-ID: <4a8coi$[e-mail]>
NNTP-Posting-Host: modem32.intercom.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 32bit)

Does anyone know where I can find the book titled:

"The low and medium frequency Radio Scrap Book" by
Kenneth Cornell, W2IMB

Thanks, Steve



From Unknown Fri Dec 08 19:15:41 1995
From: Vance Campbell <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Code practice oscillator?
Date: 4 Dec 95 20:14:58 GMT
Organization: Novell, Inc.
Lines: 7
Message-ID: <49vkt1$[e-mail]>
References: <493ksq$[e-mail]>
NNTP-Posting-Host: gronk.provo.novell.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Macintosh; I; PPC)
X-URL: news:493ksq$[e-mail]
Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!infoseek.com!uunet!in1.uu.net!meaddata!newsjunkie.ans.net!howland.reston.ans.net!newsserver.jvnc.net!legba.fpk.novell.com!news.fpk.novell.com!uel!gronk.provo.novell.com!grok.provo.novell.com!usenet

There is a fairly simple circuit in the Boy Scout Radio Merit Badge
book. I haven't tried it so I can't comment, however...

73
Vance WA7ROI




From Unknown Fri Dec 08 19:15:42 1995
Path: news.epix.net!news.sprintlink.net!newsie.dmc.com!news.iii.net!news
From: "Thomas C. J. Sefranek" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Datas MRF 148 ???
Date: 5 Dec 1995 13:41:11 GMT
Organization: SRC
Lines: 14
Message-ID: <4a1i6a$[e-mail]>
References: <49ha2p$[e-mail]>
NNTP-Posting-Host: wa1rhp.iii.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2N (Windows; I; 16bit)
To: [e-mail]

What specs do you need?

Did you try http//:motorola.com ?

MRF148
30 Watts
2 - 175 Mhz
50 VDC
18 db gain @ 30 Mhz.

Enjoy
Tom




From Unknown Fri Dec 08 19:15:43 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!psinntp!psinntp!psinntp!psinntp!main03!landisj
From: [e-mail] (Joe Landis - Systems & Network Mgr)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Drilling PC boards
Message-ID: <[e-mail]>
Date: 5 Dec 95 12:46:38 EST
References: <[e-mail]>
Distribution: world
Organization: North American Drager - Telford, PA
Lines: 28

In article <[e-mail]>, [e-mail] writes:
> A friend of mine (KA3NLV) is a machinist. I was aghast when he showed me how to
> keep a drill bit from wandering (me being a sparky type)!  He chucked the drill
> bit all the way down to within 1/4 inch of the end of the bit in the drill
> press.  He explained that bits are made of hardened steel and the cutting edge
> is quite strong and will not be harmed.  Besides, in this application you are
> never going to use that bit for more that 1/8 inch or so depth anyway.
And you don't cut on the side of a drill anyway :)
>
> Another neat device he showed me was a drilling device (I don't what is
> called,but I seem to recall seeing one at the local hardware store) that has a
> shank about 3/16 inch but it tapers down and has a VERY short drill bit that is
> considerable smaller in diameter (about the right size for PC board holes).
>
> Ray Mack
> WD5IFS
> [e-mail]

It's a center drill. Also when going for best accuracy it's best not to have
the workpiece too far from the drill point when it's at rest.
(Bring the table up to the tool) This will reduce wandering caused by spindle
and colunm flex and slop.

73,
Joe - AA3GN
--
Joe Landis - Systems and Network Manager - North American Drager - Telford, PA
[e-mail]                        ..speaking only for myself, of course..


From Unknown Fri Dec 08 19:15:47 1995
Path: news.epix.net!news.sprintlink.net!news.heurikon.com!uwvax!uwm.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!newsjunkie.ans.net!news.agt.net!news
From: [e-mail] (Steve Mason)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Drilling PC boards
Date: 6 Dec 1995 17:34:11 GMT
Organization: AGT Ltd.
Lines: 15
Distribution: world
Message-ID: <4a4k6j$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: clgrpt05-port-13.agt.net
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.6

In article <[e-mail]>, [e-mail] says...

:>> keep a drill bit from wandering (me being a sparky type)!  He chucked the drill
:>> bit all the way down to within 1/4 inch of the end of the bit in the drill
:>> press.

:>It's a center drill. Also when going for best accuracy it's best not to have
:>the workpiece too far from the drill point when it's at rest.
:>(Bring the table up to the tool) This will reduce wandering caused by spindle
:>and colunm flex and slop.


 Great tips, thanks!




From Unknown Fri Dec 08 19:15:48 1995
Path: news.epix.net!news.sprintlink.net!hookup!usenet.eel.ufl.edu!col.hp.com!news.dtc.hp.com!hpscit.sc.hp.com!rkarlqu
From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: frequency standard using GPS?
Date: 3 Dec 1995 02:49:43 GMT
Organization: Hewlett-Packard
Lines: 48
Message-ID: <49r387$[e-mail]>
References: <48u4bl$[e-mail]> <49h75c$[e-mail]>
NNTP-Posting-Host: hpscrj.scd.hp.com

In article <49h75c$[e-mail]>, Joanne Dow <[e-mail]> wrote:
>In article <48u4bl$[e-mail]>,
>
>It entirely depends on how this 1PPS signal is derived. If there is software
>intervention in its generation then there is little or no hope that it is
>accurate. Most cheap GPS implementations have the entire loop in software. This

In any event, the Motorola Oncore engine (a few hundred dollars) is
quite adequate.

>It was designed with this in mind, I am sure. It is also not a cheap instrument
>such as the Magellans you find at Fry's or other mass marketing shops.

Well, yes, you could buy a whole Magellan at retail for what we OEM the Motorola
engine for.

>>If you just want to check the accuracy of your counter, simply measure
>>the period of the 1 PPS output with averaging turned on.  You can adjust your
>>counter's timebase until it reads exactly 1 second.
>
>It'd also allow you to watch the jitter if you have good enough resolution. (It
>"COULD" be as high as tens of microseconds of jitter for pure software Costas
>Loops.)

We've never seen anything even as high as a whole microsecond.

Note that I said to turn averaging on on the counter!

>As another point in the discussion do not look for a short term average to give
>you an oscillator that is more accurate than about 0.1ppm. (That is "roughly"
>the range of the dithering on the signals. You ain't gonna do any better than
>that on a second by second basis. Note - I say "roughly". I think the precise
>numbers are still quite classified. I do know I designed that stuff so I am not

What is known is this:  the US Naval Research Laboratory tested our receiver
and measured an average error of 50 nsec. compared to UTC.  This is the best
performance that they have measured, at least in the unclassified domain.

>about to use it as a frequency standard reference without at least an hour's
>averaging time.)

Precisely.  We average for around an hour when using quartz oscillators.
We suggest a day or two of continuous operation before expecting maximum
accuracy.  For our cesium based GPS systems, we average for a week! to remove SA.


Rick Karlquist N6RK
[e-mail]


From Unknown Fri Dec 08 19:15:50 1995
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!in1.uu.net!brighton.openmarket.com!decwrl!nntp.crl.com!crl14.crl.com!not-for-mail
From: [e-mail] (Peter Gerba)
Newsgroups: rec.radio.amateur.homebrew
Subject: FS Millen Grid Dip Meters
Date: 4 Dec 1995 00:33:40 -0800
Organization: CRL Dialup Internet Access        [phone]  [Login: guest]
Lines: 8
Message-ID: <49ubp4$[e-mail]>
NNTP-Posting-Host: crl14.crl.com
X-Newsreader: TIN [version 1.2 PL2]

Model 90651:  1) sn 3629 fair/good, crack in meter glass, works well,
w/coil set $75; 2) sn355 fair, w/coils, working, $65; 3) sn4399 meter
complete, no coils, ac cord cut, $20;
4) 90651 Kit sn (), in case,w/coils very good cond. $165

pete
[e-mail]



From Unknown Fri Dec 08 19:15:51 1995
Path: news.epix.net!news.sprintlink.net!news.accessus.net!news.uoregon.edu!europa.chnt.gtegsc.com!news.umbc.edu!haven.umd.edu!purdue!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!Germany.EU.net!news.dfn.de!zrz.TU-Berlin.DE!zib-berlin.de!uni-paderborn.de!news.sni.de!news
From: [e-mail] (W.F.Schroeder)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: FSK Demodulator schematic?
Date: Mon, 04 Dec 1995 09:47:38 GMT
Organization: none
Lines: 81
Message-ID: <49ug56$[e-mail]>
References: <427l66$[e-mail]> <4282vh$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: django.pdb.sni.de
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (RudyKEVY) wrote:

>The op amp circuit you describe is not the one I am after.  That is a
>"comparator" type demodulator and feeds a squared up audio signal to the
>computer where the software does the rest of the job.  This works quite
>well for SSTV and (I am told) fairly well for RTTY, etc.  However I want
>to do the frequency to voltage conversion outside the computer and feed
>some really promising software for the commercial and amateur TOR modes.

HamComm 3.0 supports AMTOR ARQ & FEC modes.  As AMTOR is almost the same as
SITOR it also copies SITOR-A/B and NAVTEX which uses SITOR-B.

Here is a sample NAVTEX transmission i copied last week (11/28/95):

20:53:20 UTC ZCZC GA22
20:53:22 UTC WZ 1809
20:53:23 UTC ENGLAND, SOUTHEAST COAST. RAMSGATE APPROACHES. EAST BRAKE
20:53:33 UTC LIGHTBUOY 51-19N 01-29E MISSING FROM STATION.
20:53:41 UTC
20:53:42 UTC NNNN
20:53:48 UTC
20:53:48 UTC ZCZC GA02
20:53:50 UTC WZ 1769
20:53:51 UTC SCOTLAND, EAST COAST. OUTER APPROACHES TO FIRTH OF FORTH. BERWICK
20:54:02 UTC BANK NORTHWARD. AIRCRAFT WRECKAGE LOCATED VICINITY 56-17N 01-10W.
20:54:14 UTC SALVAGE OPERATIONS IMMINENT. ALL VESSELS REQUESTED TO GIVE AREA
20:54:24 UTC WIDE
20:54:25 UTC BERTH. CANCEL WZ 1752 (GA94).
20:54:31 UTC
20:54:31 UTC NNNN
20:54:51 UTC
20:54:56 UTC CUL
20:54:57 UTC
20:54:57 UTC
20:54:57 UTC  ZCZC GE15
20:54:59 UTC CULLERCOATSRADIO
20:55:02 UTC SHIPPING FORECAST
20:55:05 UTC
20:55:05 UTC 2048 ON TUESDAY 28 NOVEMBER 1995
20:55:11 UTC
20:55:12 UTC THE GENERAL SYNOPSIS AT MIDDAY
20:55:17 UTC LOW SOLE 994 EXPECTED 180 MILES SOUTHWEST OF SHANNON 998 BY
20:55:27 UTC MIDDAY
20:55:28 UTC TOMORROW. LOW SHANNON 998 EXPECTED 80 MILES WEST OF SOLE 998
20:55:39 UTC BY
20:55:40 UTC SAME TIME. NEW LOW EXPECTED TRAFALGAR 998 BY THAT TIME. HIGH
20:55:50 UTC 80
20:55:51 UTC MILES SOUTHWEST OF ICELAND 1028 EXPECTED NORTH UTSIRE 1031 BY
20:56:01 UTC MIDDAY TOMORROW
20:56:03 UTC
20:56:04 UTC THE AREA FORECASTS FOR THE NEXT 24 HOURS ISSUED BY THE MET.
20:56:13 UTC OFFICE
20:56:15 UTC AT 281900 GMT
20:56:17 UTC
20:56:17 UTC VIKING NORTH UTSIRE SOUTH UTSIRE
20:56:23 UTC SOUTHEASTERLY 4 OR 5, OCCASIONALLY 6 AT FIRST. OCCASIONAL RAIN.
20:56:34 UTC MODERATE OR GOOD
20:56:37 UTC
20:56:37 UTC FORTIES CROMARTY FORTH TYNE DOGGER FISHER GERMAN BIGHT
20:56:46 UTC SOUTHEASTERLY 4 OR 5, OCCASIONALLY 6. MAINLY FAIR. GOOD, BECOMING
20:56:58 UTC MODERATE OR POOR IN FISHER AND GERMAN BIGHT
20:57:05 UTC
20:57:05 UTC HUMBER THAMES DOVER WIGHT
20:57:09 UTC SOUTHEASTERLY 4 OR 5, OCCASIONALLY 6 IN WIGHT AT FIRST. SHOWERS.
20:57:21 UTC GOOD
20:57:22 UTC
20:57:22 UTC FAIR ISLE
20:57:24 UTC EASTERLY VEERING SOUTHEASTERLY 4 OR 5, OCCASIONALLY 6. SHOWERS.
20:57:35 UTC GOOD
20:57:36 UTC
20:57:36 UTC FAEROES
20:57:37 UTC NORTHEASTERLY 6 OR 7 VEERING SOUTHEASTERLY 5. MAINLY FAIR. GOOD
20:57:48 UTC
20:57:49 UTC NNNN

Regards
W.F.Schroeder
DL5YEC
(HamComm expert :-)




From Unknown Fri Dec 08 19:15:53 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!howland.reston.ans.net!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Peter L. Williamson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ham-Homebrew Digest V95 #421
Date: 6 Dec 95 06:49:46 GMT
Organization: ucsd usenet gateway
Lines: 36
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

---------------------------
>
>Date: Mon, 04 Dec 95 18:50:10 GMT
>From: [e-mail] (WB3U)
>Subject: PC Board Proto:  Software
>
>   Vance Campbell <[e-mail]> wrote:
>
>>I am interested in some shareware layout and or schematic software that
>>is supported on the major platforms so that everyone can use it.
>
>Same here.  I downloaded a copy of easytrax.zip and it looks pretty
>interesting.  Unfortunately, it won't print to my HP inkjet.  Anyone
>know a freeware/shareware layout program that will?  Alternately, is
>software available to allow an inkjet to emulate a laserjet?
>
>73,
>Jack  WB3U
>
Hello all, I thought I would put in my 2 cents worth.
EASYTRAX is a cut down version of PROTEL AUTOTRAX which I use.  The Laserjet
driver works fine with my HP Deskjet 540 printer.  Alternatively you can
plot to a HP plotter and set the output device to a file, ie create a HPGL
plotter file.  I have seen a few shareware programs which claim to  print
these on a printer eg prtgl128.zip available by ftp
ftp.ee.ualberta.ca/pub/cookbook/softw/ibm/index.html - I havent used it, I
use a commercial program called PRINTIT which will also do the colour overlays.
Try exposing your PCB direct from a paper print - IT WORKS around double
exposure.
Regarding photo resists I have used ELECTROLUBE PRA200H for a number of
years with a mild caustic soda solution as developer. It works a treat, no
nasties in its use and exposes in sunlight or a Suntan lamp in 3-5 minutes,
not critical, I have forgotten some up to 25 minutes and still ok when
developed.  Cost around AUST$35 for a 200mL spray can which lasts for years.
73 Peter L. Williamson VK4AWP  [e-mail]



From Unknown Fri Dec 08 19:15:54 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsjunkie.ans.net!news.agt.net!news
From: [e-mail] (Steve Mason)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.cb,rec.radio.noncomm,rec.radio.scanner,rec.radio
Subject: Re: Hams please read ....
Date: 4 Dec 1995 23:36:07 GMT
Organization: AGT Ltd.
Lines: 12
Message-ID: <4a00l7$[e-mail]>
References: <492ab0$[e-mail]> <znr817238843k@Digex>
NNTP-Posting-Host: clgrpt01-port-18.agt.net
Mime-Version: 1.0
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In article <znr817238843k@Digex>, [e-mail]≡ says...

>Internet lore: the term was derived from the Monty Python skit, were 'spam'
>was said/sung numerous times.  It was a really funny skit, too.

 Bloody Vikings!!

 I guess Nye Vikings to get back on topic...


Steve



From Unknown Fri Dec 08 19:15:55 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!usc!sdd.hp.com!hp-pcd!hpcvra!news
From: Steve Harper <[e-mail]>
Subject: Re: Help Needed: Expert Hackers only (long)
Sender: [e-mail] (news processing)
Message-ID: <[e-mail]>
Date: Fri, 8 Dec 1995 16:51:21 GMT
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; charset=us-ascii
References: <4a799h$[e-mail]>
Nntp-Posting-Host: hpcvdbh.cv.hp.com
Mime-Version: 1.0
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)
Organization: Hewlett-Packard Mobile Computing Division
Lines: 14

Seems to me the simplest and most effective way to do this is use the
"garment".  Most bra's fasten at the back with a couple of little metal
hooks.  Seems like it would be easy to sew into each side of the garment
a little braided (for flexibility) wire which connects to its associated
hook in the back.  Around in front, the two wires go into a miniature two
pin plug.  The plug's mate is in the patient monitor device.  One pin has
a pullup resistor (100 kohm or so) to 3 volts and to the logic sensing
input.  The other side is connected to ground.  If the input ever goes
high, you know the monitor was pulled out, or the garment strap was
unhooked...  Interesting application.  Hope this helps

-Steve Harper-
HP Mobile Computing Div R&D



From Unknown Fri Dec 08 19:15:56 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!nntp.coast.net!harbinger.cc.monash.edu.au!news.rmit.EDU.AU!goanna.cs.rmit.EDU.AU!core.apana.org.au!usenet
From: [e-mail] (P Dettmann)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: High Voltage Capacitors
Date: Tue, 05 Dec 1995 21:29:37 GMT
Organization: Australian Public Access Network Association
Lines: 9
Message-ID: <4a2a7l$[e-mail]>
References: <43rna6$[e-mail]>
NNTP-Posting-Host: suburbia.apana.org.au
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (kennedy) wrote:
>Can anyone tell me of a vendor who can supply a 2000WVDC capacitor
>with a value of at least 1000ufs??

        I guess you dont really mean 1000uf @2kv as this would smooth the
output of the dc supply for a whole town.

                     Peter Dettmann



From Unknown Fri Dec 08 19:15:57 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!SantaFe!usenet
From: Jim Potter <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: High Voltage Capacitors
Date: Tue, 05 Dec 1995 21:05:38 -0700
Organization: JP Accelerator Works, Inc.
Lines: 31
Message-ID: <[e-mail]>
References: <43rna6$[e-mail]> <4a2a7l$[e-mail]>
NNTP-Posting-Host: dial131.roadrunner.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b3 (WinNT; I)

P Dettmann wrote:
>
> [e-mail] (kennedy) wrote:
> >Can anyone tell me of a vendor who can supply a 2000WVDC capacitor
> >with a value of at least 1000ufs??
>
>         I guess you dont really mean 1000uf @2kv as this would smooth the
> output of the dc supply for a whole town.
>
>                      Peter Dettmann1/2 C V^2 = 2000 joules stored energy.  That's big but not
outrageous.  Also, not cheap.  Try:
Chicago Condenser 312-774-6666
Condenser Products Corp. 904-796-3561
High Energy Corp. 215-593-2800
Plastic Capacitors 312-489-2229

There are others, look in your EEM catalog.  The above are some
that I have had satisfactory dealings in the past.  High Energy
Corp, in particular, made me a 6000 J capacitor.  Their one off
prices are pretty good. some of the others want as much for the
first one as the do for the first two on specials.  All of them
will need to know details about the application since there are
many tradeoffs on terms of performance and cost.

Jim

--
James M. Potter, President      E-mail: [e-mail]
JP Accelerator Works, Inc.      URL: www.jpaw.com/jpaw/
2245 47th Street                Voice: 505-662-5804
Los Alamos, NM 87544-1604       FAX: [phone]


From Unknown Fri Dec 08 19:15:58 1995
Path: news.epix.net!news.sprintlink.net!hookup!news.kei.com!newsfeed.internetmci.com!in2.uu.net!mnemosyne.cs.du.edu!nyx10.cs.du.edu!not-for-mail
From: [e-mail] (larry kollar)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How do I keep my computer from spewing rf?
Date: 2 Dec 1995 22:34:17 -0700
Organization: University of Denver, Dept. of Math & Comp. Sci.
Lines: 17
Message-ID: <49rcsq$[e-mail]>
References: <49leke$[e-mail]>
NNTP-Posting-Host: nyx10.cs.du.edu

Thus spake Morgan Patterson (VE6MRP):
>I have tried to use my 2m radio with an antenna about 10' away from my
>computer and my radio next to my computer, but all I get is static from
>my computer (I can't even squelch it out)!!! What is the best way to rf
>proof my computer case?

An easier solution might be to move the antenna.  Sometimes that's all
it takes.

If that doesn't work (or isn't feasible), ferrite chokes on all cables
exiting the computer might help.  That includes the power cord, BTW.

73 de KC4WZK
--
Larry Kollar, Dawsonville GA  | *** Hatred is murder *** (1 Jn 3:15)
[e-mail]      | http://nyx10.cs.du.edu:8001/~lekollar/
                  "His third dimension done been re-VOKED!"


From Unknown Fri Dec 08 19:15:59 1995
Date: 5 Dec 1995 17:00:46 EDT
Path: news.epix.net!news.sprintlink.net!newsat!engineer.mrg.uswest.com!news.uoregon.edu!chi-news.cic.net!io.org!torfree!gts!westonia!feline!humnet.humberc.on.ca!hduff
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Hugh Duff)
Message-ID: <[e-mail]>
Organization: HumberNet LSS, Humber College, Canada
References: <49leke$[e-mail]>
Subject: Re: How do I keep my computer from spewing rf?
Lines: 31


> I have tried to use my 2m radio with an antenna about 10' away from my
> computer and my radio next to my computer, but all I get is static from
> my computer (I can't even squelch it out)!!! What is the best way to rf
> proof my computer case? I was thinking of covering all of the plastic
> parts (front cover, etc.) with metal door screen and spraying with
> metallic paint (will this work?). I was also going to put torroids on the
> power connections. Is this a good plan of attack? Thanx in advance.
>
> --
> 73 & ttyl     Morgan Patterson
>        \\///  Internet: [e-mail]
>        (o o)  Ham Radio: VE6MRP
>         (_)   "Ok, take your best shot. Aim well: I don't die easy"
> ----oOO-----OOo--------------------------------------------------------------
>


I'd say that you're best bet would be to relocate the antenna at a
distance greater than 10 feet away from the computer.
Some computers spew out less RF trash than others, not only due to the
quality of the case but the motherboard design (quality and number of
layers/ground planes) and speed.
If there's an alternate place where the antenna can be relocated to
which is a lot further away then that should be your first step.

Regards...Hugh Duff  VA3TO


---
 ■ NFX v1.3 [000]


From Unknown Fri Dec 08 19:16:00 1995
From: [e-mail] (Watts)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: HR2600-s301?
Date: 8 Dec 1995 12:13:46 -0700
Organization: Colorado State University, Fort Collins, CO  80523
Lines: 11
Message-ID: <4aa2pa$[e-mail]>
NNTP-Posting-Host: lamar.acns.colostate.edu
X-Newsreader: TIN [version 1.2 PL2]
Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!news.erinet.com!test.erinet.com!imci3!news.internetMCI.com!newsfeed.internetmci.com!in2.uu.net!brighton.openmarket.com!decwrl!purdue!yuma!lamar.ColoState.EDU!not-for-mail
Xref: news.epix.net rec.radio.amateur.equipment:22230 rec.radio.amateur.homebrew:11971

I'm about to do the Chipswitch mod to my HR2600, and I noticed a six
pole DIP switch marked 'S301'.  Mine currently has switches 1,2,5 and 6
OFF, 3 and 4 ON.
Anybody know what these switches do, and if they have a function with the
Chipswitch uProc?

Anybody want an old UC-1251 uProc?  ;-)

Galen, KF0YJ

I'm using my 2600 as an IF for transverters.


From Unknown Fri Dec 08 19:16:01 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!newsfeed.direct.ca!usenet
From: [e-mail] (Don Boekenkruger)
Newsgroups: rec.radio.amateur.digital,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.packet
Subject: http://www.burnabyradio.com/ham/brc.html
Date: 6 Dec 1995 06:55:39 GMT
Organization: Internet Direct Inc.
Lines: 36
Message-ID: <4a3epb$[e-mail]>
NNTP-Posting-Host: 204.174.244.165
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.6
Xref: news.epix.net rec.radio.amateur.digital.misc:12959 rec.radio.amateur.equipment:22103 rec.radio.amateur.homebrew:11892

Hello to all who read this message.

I am letting you all know that the Burnaby Radio communications WWW page
is
now running stable, you should be able to check it out at any time.

Some of you had problems before accessing our WWW page, but that problem
should be over now.  We have changed servers so our WWW Page should work
all
the time now.


The page is at "http://www.burnabyradio.com/ham/brc.html"


We are:  Burnaby Radio Communications Ltd.
         4257 E. Hastings Street
         Burnaby, B.C.  Canada
         V5C 2J5
         Phone: [phone]
         Fax:  [phone]
         BBS:  [phone]

WWW: http://www.burnabyradio.com/ham/brc.html

Please visit us!!!

And please fill out our form, and you will receive our latest price
list.

Thanks.


Don Boekenkruger
[e-mail]



From Unknown Fri Dec 08 19:16:02 1995
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!agate!howland.reston.ans.net!math.ohio-state.edu!pacific.mps.ohio-state.edu!usenet
From: James Garland <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: if amps
Date: 6 Dec 1995 19:21:25 GMT
Organization: The Ohio State University
Lines: 10
Message-ID: <4a4qfl$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: maps1.mps.ohio-state.edu
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2N (Windows; I; 16bit)

I think Wayne, WB7WHI, has the correct answer. The source resistance is
computed on the basis of the desired bias point (or, equivalently, drain
current) for the JFET, the tradeoff being noise figure vs. dynamic range.
SInce the gate is grounded to dc, via a gate leak resistor or input
transformer winding, the full bias voltage Vgs is developed across the
source resistor.  In my experience, Rs isn't critical, and it is best to
fiddle with various values in order to find the optimum value. Rs is
usually bypassed for r.f. so that gain isn't sacrificed.
Jim W8ZR



From Unknown Fri Dec 08 19:16:03 1995
Path: news.epix.net!news.sprintlink.net!news.heurikon.com!uwvax!uwm.edu!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (wayne barnhart)
Newsgroups: rec.radio.amateur.homebrew
Subject: if amps
Date: 6 Dec 95 18:04:00 GMT
Organization: ucsd usenet gateway
Lines: 23
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

I'm trying to build an IF amplifier using JFETs. It's a common
source configuration with a parallel LC tuned circuit in the
drain circuit to VCC.

Naturally the source resistor goes to ground, but how do I calculate
its resistance?

I've seen how to calculate source and drain resistances but not
when there is a tuned circuit in the drain.

The resonant frequency of the LC circuit is 50MHz.

Any help would be most gratefully accepted, thanks.
Ian
---------------------------------------------------------
An interesting question, would like to know myself. Could you assume that DC
ignors the tank circuit therefore all the DC bias, Vds, must come from the
source. If so then compute the resistance to provide the required drain
current. I donno, will be watching for an answer.

Wayne Barnhart  WB7WHI                               Dirt is good!
Spokane, Wa.



From Unknown Fri Dec 08 19:16:04 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!nntp.coast.net!col.hp.com!fc.hp.com!jayk
From: [e-mail] (Jay Kesterson K0GU)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: Info on Ten-Tec 6M xverter?
Followup-To: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Date: 5 Dec 1995 19:03:17 GMT
Organization: Morris is a cat, Morse is a code
Lines: 12
Distribution: usa
Message-ID: <4a251l$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: bigdog.fc.hp.com
X-Newsreader: TIN [version 1.2 PL2]
Xref: news.epix.net rec.radio.amateur.equipment:22080 rec.radio.amateur.homebrew:11878

Mark Monninger ([e-mail]) wrote:
: Does Ten-Tec still sell the 6M transverter kit they offerred a couple years
: ago? Does anyone have any experience with it?  I believe it uses a 20M IF,
: right? I'm thinking it might be an interesting companion to a 20M SSB QRP rig.
: Comments? Opinions?
: 73...     Mark   AA7TA

I bought a new one (assembled) from TenTec back in June. Its a great little
unit. Puts out ~10 watts and has good RX. I use the xverter with a FT-1000D
and its much better selectivity wise than my older 6m multi mode.

73, Jay  K0GU                  [e-mail]


From Unknown Fri Dec 08 19:16:05 1995
Path: news.epix.net!news.sprintlink.net!nntp.primenet.com!primenet.primenet.com!markem
From: [e-mail] (Mark Monninger)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Info on Ten-Tec 6M xverter?
Date: Sat, 2 Dec 1995 15:22:03 MST
Organization: Primenet
Lines: 7
Distribution: usa
Message-ID: <[e-mail]>
NNTP-Posting-Host: ip219.phx.primenet.com
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4]
Xref: news.epix.net rec.radio.amateur.equipment:22088 rec.radio.amateur.homebrew:11885

Does Ten-Tec still sell the 6M transverter kit they offerred a couple years
ago? Does anyone have any experience with it?  I believe it uses a 20M IF,
right? I'm thinking it might be an interesting companion to a 20M SSB QRP rig.

Comments? Opinions?

73...     Mark   AA7TA


From Unknown Fri Dec 08 19:16:05 1995
Path: news.epix.net!news.sprintlink.net!news.zeitgeist.net!bdt.com!news.ossi.com!agate!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail](Timothy R. Havens )
Newsgroups: rec.radio.amateur.homebrew
Subject: Info Requested - 2Mbps/10Ghz Data Link Project.
Date: 3 Dec 1995 18:06:50 GMT
Organization: Netcom
Lines: 19
Message-ID: <49sovq$[e-mail]>
NNTP-Posting-Host: ix-tf7-16.ix.netcom.com
X-NETCOM-Date: Sun Dec 03 10:06:50 AM PST 1995

If anyone has had ANY experience constructing or tuning, or
administering a setup as described in the 1994 ARRL Handbook regarding
the 2 Mbps Microwave Data Link for 10Ghz, please share WHATEVER you
know with me.

I am about to attempt this project, and would love to hear from anyone
who has successfully, or even unsuccessfully completed or attempted
this same project.  Your achievements, and failures via email or phone
would be an outstanding benefit to me.

Best Regards,

Happy Holidays,

Email to: WX2L @ ix.netcom.com
PHone:    [phone]

Tim Havens
WX2L


From Unknown Fri Dec 08 19:16:06 1995
Path: news.epix.net!news.sprintlink.net!nntp.coast.net!chi-news.cic.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (VINY N1VC)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Info Requested - 2Mbps/10Ghz Data Link Project.
Date: 4 Dec 1995 23:53:50 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 9
Sender: [e-mail]
Message-ID: <4a0j8u$[e-mail]>
References: <49sovq$[e-mail]>
Reply-To: [e-mail] (VINY N1VC)
NNTP-Posting-Host: newsbf02.mail.aol.com

I only built the dish and feed. It works like a champ. I have not done any
side lobe
measurements, but I can tell you that the forward gain is definately
better than the penny splasher I previously used with the same 2 foot
dish. I also wouldn't be too hung up on the gunnplexer they recommend in
the article. I think you could do just fine with an alpha or door opener
one seen at flea markets. Hope this helps somewhat..

-Viny N1VC


From Unknown Fri Dec 08 19:16:07 1995
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!usenet.hana.nm.kr!usenet.seri.re.kr!news.dacom.co.kr!nntp.coast.net!torn!newshost.uwo.ca!usenet
From: Rick Gerson <rgerson>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Info Requested - 2Mbps/10Ghz Data Link Project.
Date: 7 Dec 1995 19:51:16 GMT
Organization: The University of Western Ontario, London, Ont. Canada
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Hi!
I am interested in this and would like the reference for the article and any
other info to get started on this project.
thank you, rick.



From Unknown Fri Dec 08 19:16:08 1995
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Thomas G. McWilliams)
Subject: Re: JFET Source Resistor
Message-ID: <[e-mail]>
Organization: Jot-Em Down Store and Library
X-Newsreader: TIN [version 1.2 PL1]
References: <4a2jvk$[e-mail]>
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Ian Mitchell ([e-mail]) wrote:
: Naturally the source resistor goes to ground, but how do I calculate
: its resistance?
:
: I've seen how to calculate source and drain resistances but not
: when there is a tuned circuit in the drain.

Just choose a resistor that will give you one or two milliamps of
quiescent current. Then bypass it for 50 MHz. You will probably find
a value in the range of 100 to 1000 ohms will do the trick.

Thomas
ars KI4N


From Unknown Fri Dec 08 19:16:09 1995
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From: [e-mail] (Emarit Ranu)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: JFET Source Resistor
Date: 7 Dec 1995 04:42:37 GMT
Organization: Colorado State University, Fort Collins, CO  80523
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Dave Kirkby ([e-mail]) wrote:
: Now find from the data sheet what gate bias V will give this drain current. Then
: R=Id/V. If the gate is not at DC, you will have to make allowances.
  ^^^^^^

        This is not right, R=V/Id.  Remember V=IR!


--
        -Emarit  73's          [e-mail]
        Electrical Engineering, Colorado State Univeristy
        KG0CQ                 _._  __.  _____  _._.  __._
        Packet:                KG0CQ@KF0UW.#NECO.USA.NOAM
        All generalizations are bad.


From Unknown Fri Dec 08 19:16:10 1995
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From: [e-mail] (Ian Mitchell)
Newsgroups: rec.radio.amateur.homebrew
Subject: JFET Source Resistor
Date: 5 Dec 1995 23:18:12 GMT
Organization: University of Tasmania
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Hi,

I'm trying to build an IF amplifier using JFETs. It's a common
source configuration with a parallel LC tuned circuit in the
drain circuit to VCC.

Naturally the source resistor goes to ground, but how do I calculate
its resistance?

I've seen how to calculate source and drain resistances but not
when there is a tuned circuit in the drain.

The resonant frequency of the LC circuit is 50MHz.

Any help would be most gratefully accepted, thanks.
Ian




From Unknown Fri Dec 08 19:16:11 1995
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From: [e-mail] (Dana Myers)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: JFET Source Resistor
Date: 7 Dec 1995 19:53:18 GMT
Organization: SunSoft South, Los Angeles, CA
Lines: 40
Message-ID: <4a7gne$[e-mail]>
References: <4a2jvk$[e-mail]> <[e-mail]>
NNTP-Posting-Host: sunspot.west.sun.com

In article <[e-mail]>,
Dave Kirkby <[e-mail]> wrote:
>In article [e-mail], [e-mail] (Ian Mitchell) writes:
>> Hi,
>>
>> I'm trying to build an IF amplifier using JFETs. It's a common
>> source configuration with a parallel LC tuned circuit in the
>> drain circuit to VCC.
>>
>> Naturally the source resistor goes to ground, but how do I calculate
>> its resistance?
>>
>> I've seen how to calculate source and drain resistances but not
>> when there is a tuned circuit in the drain.
>>
>> The resonant frequency of the LC circuit is 50MHz.
>>
>> Any help would be most gratefully accepted, thanks.
>> Ian
>>
>>
>Assuming the gate is at ground as far is DC is concerned, it's easy.
>Deceide on the drain current Id, by checking on the data sheet what gives
>optimum performance. The best Id will depend on whether you want
>low-noise, or good strong signal performance.  Now find from the data
>sheet what gate bias V will give this drain current. Then R=Id/V. If the
>gate is not at DC, you will have to make allowances. In practice, the
>required gate bias is not too well defined, so if the Id is critical, I
>would make the source resistor adjustable.

Which is to say, use the same process as you would for a resistive
drain load ;-).

Siliconix has a very nice linear product brief (LPD-2) which discusses
the biasing of FETs and sensitivity to device characteristics.

--
 * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are      *
 * [phone]               | mine and do not necessarily   *
 * [e-mail]      | reflect those of my employer  *


From Unknown Fri Dec 08 19:16:12 1995
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From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Measuring phase-noise with HP 8640B
Date: 3 Dec 1995 21:12:45 GMT
Organization: Hewlett-Packard
Lines: 25
Message-ID: <49t3sd$[e-mail]>
References: <495ui8$[e-mail]> <49i5at$[e-mail]>
NNTP-Posting-Host: hpscrj.scd.hp.com

In article <49i5at$[e-mail]>, Zack Lau  <[e-mail]> wrote:
>
>If you look at the specs for the 8640, they aren't that
>great, because they give it for the oscillator before
>they divide it down.  Done properly, you get 6 dB/octave
>improvement on close-in phase noise you as divide it down,
>so the HF phase noise is bit better than at 448 MHz.

At offsets like 20 kHz., you reach the noise floor
after a few octaves and no longer go down 6 dB/octave.


>BTW If you are looking for a challenging project--may I
>suggest a computer controlled synthesizer that covers the
>HF bands with less phase noise than the HP8640 and spurs
>at least 80 dB down?  Even better if you can turn it
>into a simple construction project for hams to build.
>
>Zack [e-mail]
>

Such a project is in process as you speak.  Stay tuned.

Rick Karlquist N6RK
[e-mail]


From Unknown Fri Dec 08 19:16:14 1995
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (David Stockton)
Subject: Re: Measuring phase-noise with HP 8640B
Sender: [e-mail] (SQF News Admin)
Message-ID: <[e-mail]>
Date: Mon, 4 Dec 1995 15:20:53 GMT
References: <49iqan$[e-mail]>
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Ed Hare ([e-mail]) wrote:
: [e-mail] (Jeff Anderson) wrote:

: >>Ricks post is most informative on this topic. The operative word
: >>in the handbook article is "crude" phase-locked loop. If the
: >>oscillator under test is any good, what they are measuring is the
: >>performance of the '8640.


    It looks like I've missed some interesting posts while our newsfeed's
been broken.   I've not seen the earlier parts of the discussion so my
comments could miss the target somewhat...

    The above is true of all phase noise test systems!


: >Good point. Interestingly, the Handbook stated that the 8640B "has a
: >much cleaner spectral output than most transmitters", and so would be
: >adequate in this application.  I wonder if the ARRL's Lab has compared
: >the results of the 8640B method with those from commercially available
: >phase-noise measurement systems?  How much worse is this technique?  Its
: >virtue is that, if you already have an 8640B, it's very simple.

    The 8640 isn't some wonder gold-standard, but they're a lot easier to
get hold of than 8662s and 8663s !


    In considering phase noise testing, the offset freq range of interest
has to be decided on carefully, the 8640 is particularly good far from
the carrier... incidentally, don't forget the old valved 606 which had a
tracking tank on its output stage - gives very low broadband noise floor.
I modified one for FM so I could lock it back in the days before "off the
peg" phase noise testers.


   Of course, a really good vcxo custom designed for a spot frequency can
always be made, and should be able to outperform all phase noise testers.
you pay in several ways for frequency coverage.


: Yes we have.  We sent a fairly clean transmitter to one of our Technical
: Advisors with a high-end HP phase-noise measurement setup.  We found we
: were within a dB or two, worst case.  I plan to do this once a year or
: so, to keep our Lab-built equipment "self calibrated" against a known,
: calibrated instrument.


   I've plenty of experience with both approaches, and the IC765 plot
was done on one of our fully traceable, calibrated, phase noise systems.

    For HF radios, the 8640 is plenty good enough to outperform existing
radio's synthesisers. A few VCXOs could be built for less than an 8640 for
state of the art performance at spot freqs - when testing synths, you can
take the mountain to mohammad.
    With the VCOs you can always build a pair and measure their JOINT
phase noise as a proof of performance, as Zack suggested for a pair of
8640s. The only way to prove a state of the art clean source may be to
build a pair...


: 73 from ARRL HQ, Ed Hare, KA1CV, ARRL Laboratory Supervisor

    Cheers
            David  GM4ZNX



From Unknown Fri Dec 08 19:16:16 1995
Path: news.epix.net!news.sprintlink.net!cc.iu.net!news
From: [e-mail] (Bob Lombardi)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Measuring phase-noise with HP 8640B
Date: 6 Dec 1995 02:42:16 GMT
Organization: Organized?  I can't even find my car keys
Lines: 88
Message-ID: <4a2vu8$[e-mail]>
References: <495ui8$[e-mail]> <49f4kj$[e-mail]> <49fe2o$[e-mail]> <49hph7$[e-mail]> <49t4fn$[e-mail]> <4a07jb$[e-mail]>
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In article <4a07jb$[e-mail]>, [e-mail] says...
>
>[e-mail] (Richard Karlquist) wrote:
>>In article <49hph7$[e-mail]>,
>>Wes Stewart  <[e-mail]> wrote:
>>>
>>>he works for them<g> The point I was making though is, the 8662 has the
>>>ability to be used over a wide frequency range and has locking capability,
>>>which Glenn's crystal standard does not.
>>>So it the application under discussion, it is pretty much the "golden standard"
>>>and is used as such in many HP phase noise test sets.
>>>
>>>Regards, Wes -- N7WS
>
>>My impression of the role the 8662 plays in the HP 3048 phase noise
>>test set is that it interfaces with the 11729 down converter.  It supplies
>>clean 640 MHz. to it from a special rear panel output available as
>>an option.  The 640 is multiplied to microwave frequencies and used
>>to down convert the microwave signal source to be measured down to
>>the 640 to 1280 MHz.  band.  The 8662 is then locked to the
>>down converted signal.  In most cases, the 8662 is cleaner
>>than the down converted microwave source, so it is a good match.
>
>True as far as it goes. The 640 MHz is used to drive the 11729/A/B/C
>harmonic generator. The 640 MHZ is generated from the internal 10 MHz
>standard by multiplication. There are, however, crystal filters at
>40 and 160 MHz to clean up some of the multiplied junk. Harmonics of this
>signal are used to downconvert a microwave signal to the range of
>5-1280 MHz where the phase detector operates, using the synthesized
>output of the 8662 as the reference.

I was under the impression that the 640 MHz is a from a SAW oscillator,
phase-locked to the 10 MHz in a very narrow loop.  That way you get the
crystal noise characteristics (don't know what N is but whatever N is,
the noise is degraded by 20 log N) inside the LBW, and the good SAW
characteristics outside the LBW.  The VCSO is better than any VCO you're
likely to build or find, if it's made from conventional resonators.


>
>When the input frequency is less than 1280 MHz, it drives the phase
>detector directly and the multiplied output/harmonic multiplier is unused.
>
>>When measuring HF sources, the 8662 is relatively useless.  Either
>>the source is too good for it, or the source is so noisy you can
>>measure it with a spectrum analyzer or modulation domain analyzer,
>>which is far easier.
>
>Hmmm. We have some missile applications where it isn't good enough
>at microwave either. But then, neither is the 11729. However, is there
>no in-between at HF? Both the spectrum analyzers and modulation analyzers
>use synthesized LOs. Are these better than high performance HF oscillators?
>How do you measure phase with a spectrum analyzer? How do you achieve the
>required dynamic range with a spectrum analyzer. This info would be very
>useful to me.
>
>73, Wes
>
>

This isn't my area of "ex-spurt-tease", but the gold standard is a multiplied
crystal, right?  If you generate a comb into the microwave region from a good
quiet source, you mix your microwave signal down to where you can measure it
with a quieter source than the 8662 (which is pretty good, but not a Godsend).
This is the approach that the 3048 test set uses, as well as the Comstron Phase
noise test set, which I've only seen demos of.  (I've used the 3048 long enough
to have a love-hate relationship with it.  Well...a tolerate-hate relationship).

If you can get the output frequency down below 1.5 GHz, the 8568 is a good spec.
analyzer, apparently quieter than the 8566 (its big brother)  You can measure noise
directly on it, subject to the usual problems with measuring phase noise on a spec.
an..  See the tons of HP sales literature/ap notes on this.



73,
Bob


(yes, I wrote FilDes, but I design synthesizers for a living....)


--
Bob Lombardi            WB4EHS in Melbourne, FL          o        \---\---\
[e-mail]    or   [e-mail]        /\            |
Telescope making, optics, astronomy, piano, bicycling  -\ 7   & radio |
I've run out of things I can say in 4 lines.         (*)/(*)          |



From Unknown Fri Dec 08 19:16:18 1995
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usenet
From: Wes Stewart <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Measuring phase-noise with HP 8640B
Date: 7 Dec 1995 05:00:54 GMT
Organization: Arizona Daily Star - AZSTARNET
Lines: 67
Message-ID: <4a5se6$[e-mail]>
References: <495ui8$[e-mail]> <49hph7$[e-mail]> <49t4fn$[e-mail]> <4a07jb$[e-mail]> <4a5dke$[e-mail]>
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[e-mail] (Richard Karlquist) wrote:
>In article <4a07jb$[e-mail]>,
>Wes Stewart  <[e-mail]> wrote:
>>
>>
>>Hmmm. We have some missile applications where it isn't good enough
>>at microwave either. But then, neither is the 11729. However, is there
>>no in-between at HF? Both the spectrum analyzers and modulation analyzers
>
>At HF the 8662 is maybe 30 dB. better than a good spectrum analyzer like
>an HP 3585.  Most crystal oscillators are better than the 8662, and
>most VCO's are noisy enough to be seen on the 3585.  So relatively
>few sources fall into the 8662 niche.

But obviously, some do.
>
>>use synthesized LOs. Are these better than high performance HF oscillators?
>
>In some cases, yes.

But then in those cases, the 8662 is better too, correct? Which is what I
thought I was trying to say.
>
>>How do you measure phase with a spectrum analyzer? How do you achieve the

>You can't measure "phase" with a spectrum analyzer.   You can
>however measure *phase noise* with a spectrum analyzer by looking
>at the noise sidebands.

That was a rhetorical question. How do you separate the phase noise
sidebands from the AM sidebands without phase detection?

>>required dynamic range with a spectrum analyzer.


>Use a wide enough resolution bandwidth so that the noise is less than
>100 dB. down.


What do I do when my spec gives me a number at 100 Hz offset and a different
number at 1 KHz offset...etc,  and I need a 10 Hz BW to do this. Or, sometimes the
phase "noise" isn't noise at all but discrete sidebands which have to be
resolved.

>Regarding modulation domain analyzers (MDA):  you have to supply a clean
>10 MHz reference to them (or use the optional built in 10811 timebase).
>There is no need for a variable signal generator with MDA techniques.
>In some cases, you want to beat the signal down to less than 1 MHz.
>A crystal oscillator with a crystal socket and a dozen or so crystals
>will take care of this.  You get more resolution by down converting.

Well, we've gotten quite far afield from the ham biz, but since we're
here, as an engineer, I would love to build these goodies.  However,
at least where I work, our test equipment is usually racked and stacked
COTS (latest buzzword). So, we open up the HP catalog and
keep you employed :-)

>MDA boxes are ideal for close in phase noise where other techniques
>fall apart.

I'm not real familiar with these, however, don't they just measure
total SSB noise and not "phase" noise. While this is usually the
dominant source, we do have requirements to separate AM & PM.

Wes -- N7WS




From Unknown Fri Dec 08 19:16:19 1995
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From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Measuring phase-noise with HP 8640B
Date: 7 Dec 1995 00:48:14 GMT
Organization: Hewlett-Packard
Lines: 44
Message-ID: <4a5dke$[e-mail]>
References: <495ui8$[e-mail]> <49hph7$[e-mail]> <49t4fn$[e-mail]> <4a07jb$[e-mail]>
NNTP-Posting-Host: hpscrj.scd.hp.com

In article <4a07jb$[e-mail]>,
Wes Stewart  <[e-mail]> wrote:
>
>
>Hmmm. We have some missile applications where it isn't good enough
>at microwave either. But then, neither is the 11729. However, is there
>no in-between at HF? Both the spectrum analyzers and modulation analyzers

At HF the 8662 is maybe 30 dB. better than a good spectrum analyzer like
an HP 3585.  Most crystal oscillators are better than the 8662, and
most VCO's are noisy enough to be seen on the 3585.  So relatively
few sources fall into the 8662 niche.

>use synthesized LOs. Are these better than high performance HF oscillators?

In some cases, yes.

>How do you measure phase with a spectrum analyzer? How do you achieve the

You can't measure "phase" with a spectrum analyzer.   You can
however measure *phase noise* with a spectrum analyzer by looking
at the noise sidebands.

>required dynamic range with a spectrum analyzer. This info would be very

Use a wide enough resolution bandwidth so that the noise is less than
100 dB. down.

>useful to me.
>
>73, Wes

Regarding modulation domain analyzers (MDA):  you have to supply a clean
10 MHz reference to them (or use the optional built in 10811 timebase).
There is no need for a variable signal generator with MDA techniques.
In some cases, you want to beat the signal down to less than 1 MHz.
A crystal oscillator with a crystal socket and a dozen or so crystals
will take care of this.  You get more resolution by down converting.

MDA boxes are ideal for close in phase noise where other techniques
fall apart.

Rick Karlquist N6RK
[e-mail]


From Unknown Fri Dec 08 19:16:20 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!news.cybercomm.net!usenet
From: Stephan Rashkin <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: MFJ QRP SSB Rigs - Worth the $$?
Date: 5 Dec 1995 21:27:53 GMT
Organization: CyberComm Online Services
Lines: 7
Message-ID: <4a2dgp$[e-mail]>
References: <49voub$[e-mail]>
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40 mtr QRP is excellent practically all hours day and night..
great throughout all sunspot cycles..I work 5 watt qrp stations
there continously..

Steve, wa2nhz




From Unknown Fri Dec 08 19:16:21 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!news.cybercomm.net!usenet
From: Stephan Rashkin <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: MFJ QRP SSB Rigs - Worth the $$?
Date: 5 Dec 1995 21:30:51 GMT
Organization: CyberComm Online Services
Lines: 14
Message-ID: <4a2dmb$[e-mail]>
References: <49voub$[e-mail]> <4a2dgp$[e-mail]>
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X-Mailer: Mozilla 1.22 (Windows; I; 16bit)


OOOPS! sorry I was thinking CW again..


Stephan Rashkin <[e-mail]> wrote:
>40 mtr QRP is excellent practically all hours day and night..
>great throughout all sunspot cycles..I work 5 watt qrp stations
>there continously..
>
>Steve, wa2nhz
>
>




From Unknown Fri Dec 08 19:16:22 1995
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From: [e-mail] (Tony Angerame - Sun SE)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: MFJ QRP SSB Rigs - Worth the $$?
Date: 6 Dec 1995 23:41:32 GMT
Organization: Sun Microsystems Inc.
Lines: 12
Distribution: world
Message-ID: <4a59nc$[e-mail]>
References: <49voub$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: mandalay.corp.sun.com

With most Mobile signals down several s-units from the home station antenna it
hardly seems worthwhile to run qrp from the mobile. Unless of course you use the
MFJ to feed a long wire once you camp. Then the Atlas will still be at least two
s-units above the qrp rig. BTW I think the old Atlas is a pretty decent rig albeit
simple. Sure was simple to fix too. I run a 210x in the car and don't worry too
much about theft since I got it for 100 bucks at a flea market.


                                          Tony WA6LZH

"Another happy Atlas user.....Don where are those new rigs anyway????"



From Unknown Fri Dec 08 19:16:24 1995
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From: [e-mail] (Kevin  AstirCS "1U"   KO0B)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: MFJ QRP SSB Rigs - Worth the $$?
Date: Thu, 07 Dec 1995 11:26:03 -0800 (PST)
Organization: Rt66.COM, Public Internet Access in New Mexico
Lines: 35
Message-ID: <4a7b8h$[e-mail]>
References: <49voub$[e-mail]>
NNTP-Posting-Host: 192.153.24.32
X-Newsreader: Forte Free Agent v0.38

Please, could we NOT turn this thread into a debate over the value of
QRP operation?

I would also like to know about these rigs (the 20M in particularf).

I am a sailplane pilot..In the winter it is sometimes possible to
"park" at 20,00' MSL or higher (Yes,  we have O2, and an agreement
with ATC...100% safe...and even legal!)

I often dream of the DX that should be possible ...Higher than most
mountain tops, and MILES from the nearest powerline,ignition system,
or other source of interferance!

I like CW fine, but SSB will be far less distracting, thus safer. Some
may be able to copy CW and fly OK, but I know MY limitations, so have
perished the thought of using my HW-8 in glider..

I have very limited power available from gell-cells, (especially as
temperatures are quite low) and very little room in cockpit. (I'm
6'5", cockpit is not!).  Also,  the rig must not swamp AC band VHF
reciever. MFJ rig looks like the ticket..small, low power, few
controls to distract me......

A zepp  (almost what it was designed for, after all!) at 20K' MSL
should produce a fair signal, QRP or not.

So could we please hear from someone who has USED one of these rigs,
or other (ten-tec??) QRP ssb rigs?

In anticipation of flames: I think homebrew group is a likely place to
look for QRP operators, so, while this is not a hombrew thread, it IS
probably the best place to post such a quiry.

73, de  KO0B



From Unknown Fri Dec 08 19:16:25 1995
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!usenet.hana.nm.kr!usenet.seri.re.kr!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!EU.net!Austria.EU.net!newsfeed.ACO.net!swidir.switch.ch!in2p3.fr!univ-lyon1.fr!elendir
From: [e-mail] (Elendir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: MGF 1402 noise figure. (And S param)
Date: 4 Dec 1995 12:46:52 GMT
Organization: ENST - Telecom Paris
Lines: 15
Message-ID: <49uqjs$[e-mail]>
References: <49a4is$[e-mail]> <49fkbu$[e-mail]>
NNTP-Posting-Host: julia.enst.fr
X-Newsreader: TIN [version 1.2 PL2]

Zack Lau ([e-mail]) wrote:

[...]
: The French representative to contact for back issues is
: Patrick Magnin, F6HYE.  Rus, N7ART is the person to contact
: in the USA.

Okay, thanks for the info. I'll try to do that.

Thanks !

Vince
--
F5RCS - Worldwide Friendship through Amateur Radio
ENST, Ecole Nationale Superieure des Telecommunications, Paris


From Unknown Fri Dec 08 19:16:26 1995
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usenet
From: Wes Stewart <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: MGF 1402 noise figure. (And S param)
Date: 5 Dec 1995 01:11:04 GMT
Organization: Arizona Daily Star - AZSTARNET
Lines: 35
Message-ID: <4a0678$[e-mail]>
References: <49a4is$[e-mail]> <49sq21$[e-mail]> <[e-mail]>
NNTP-Posting-Host: usr1ip51.azstarnet.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)
To: [e-mail]

Ian G3SEK <[e-mail]> wrote:
>
[bandwidth reduction]

>Here are the S-parameters of the MGF1302 (same chip), measured down
>to 100MHz.
>
>!MGF1302-15 S-Parameters
>!Vds=3V  Ids=10mA  Measured by DG6GC. Ref: DUBUS-Info, 2/1993, p.54
>#GHZ S MA R 50
>1      1.000   359.000 3.740   178.00  0.0018  88.00   0.695   358.00
>15     1.000   357.60  3.733   176.85  0.002   87.04   0.693   358.00
>2      0.999   356.50  3.726   175.80  0.004   83.94   0.691   357.20
>3      0.999   354.00  3.713   173.70  0.006   84.65   0.690   355.30
>4      0.998   351.76  3.694   171.42  0.008   83.31   0.687   354.03
>5      0.996   349.29  3.693   169.32  0.011   81.36   0.688   352.63
>6      0.993   346.93  3.697   167.03  0.013   79.94   0.686   351.05
>7      0.991   344.60  3.695   164.82  0.015   78.42   0.684   349.48
>8      0.988   342.13  3.686   162.45  0.018   76.99   0.682   347.84
>9      0.986   339.92  3.680   160.43  0.020   75.06   0.682   346.34

 [other data snipped]

Ian:

I believe some decimal points are missing from the frequency column, yes?

Also, it's unusual to see the angles expressed > =/- 180 deg. Also interesting
to see that my curve fitting predicted these data pretty well:-) Thanks for the
info.

73

Wes -- N7WS



From Unknown Fri Dec 08 19:16:27 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!btnet!demon!mail2news.demon.co.uk!ifwtech.demon.co.uk
From: Ian G3SEK <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: MGF 1402 noise figure. (And S param)
Date: Tue, 05 Dec 1995 07:37:00 +0000
Organization: IFWtech
Lines: 45
Message-ID: <[e-mail]>
References: <49a4is$[e-mail]> <49sq21$[e-mail]> <[e-mail]> <4a0678$[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: ifwtech.demon.co.uk
X-Newsreader: Newswin Alpha 0.9.1
X-SMTP-Posting-Host: ifwtech.demon.co.uk [Tue, 5 Dec 95 14:06:17 GMT]
X-SMTP-Posting-Host: post.demon.co.uk [Tue, 5 Dec 95 14:08:34 GMT]

In article: <4a0678$[e-mail]>  Wes Stewart <[e-mail]>
writes:
:
: Ian G3SEK <[e-mail]> wrote:
: >
: [bandwidth reduction]
:
: >Here are the S-parameters of the MGF1302 (same chip), measured down
: >to 100MHz.
: >
: >!MGF1302-15 S-Parameters
: >!Vds=3V  Ids=10mA  Measured by DG6GC. Ref: DUBUS-Info, 2/1993, p.54
: >#GHZ S MA R 50
: >1      1.000   359.000 3.740   178.00  0.0018  88.00   0.695   358.00
: >15     1.000   357.60  3.733   176.85  0.002   87.04   0.693   358.00
:
: Ian:
:
: I believe some decimal points are missing from the frequency column, yes?
:
: Also, it's unusual to see the angles expressed > =/- 180 deg. Also
: interesting to see that my curve fitting predicted these data pretty well:-)
: Thanks for the info.
:

Sorry about that glitch. There should indeed be decimal points at
the beginning of each line below 1.0GHz. It seems that many types of mailer
software will ignore a period at the beginning of a line.

Yes, the angles >=180deg are unusual, but I thought it better to copy them
exactly as printed in DUBUS. All respectable software should be able to handle
them correctly.

The values should extrapolate quite smoothly to lower frequencies, because the
device itself tends towards simple "triode" behaviour at LF. Still, it's good
to have some genuine measured values for a change.


--
73 from Ian G3SEK          Editor, 'The VHF/UHF DX Book'
                          'In Practice' columnist for RadCom (RSGB)
Professionally:
IFW Technical Services     Clear technical English - anywhere.



From Unknown Fri Dec 08 19:16:28 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!swidir.switch.ch!in2p3.fr!univ-lyon1.fr!elendir
From: [e-mail] (Elendir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: MGF 1402 noise figure. (And S param)
Date: 8 Dec 1995 10:35:16 GMT
Organization: ENST - Telecom Paris
Lines: 15
Message-ID: <4a94d4$[e-mail]>
References: <49a4is$[e-mail]> <49sq21$[e-mail]> <[e-mail]>
NNTP-Posting-Host: julia.enst.fr
X-Newsreader: TIN [version 1.2 PL2]

Ian G3SEK ([e-mail]) wrote:

[...]

Thanks for the info.
I should probably buy the DUBUS more often !

Thank you very much, that should be very valuable !

73 de F5RCS

Vince
--
F5RCS - Worldwide Friendship through Amateur Radio
ENST, Ecole Nationale Superieure des Telecommunications, Paris


From Unknown Fri Dec 08 19:16:29 1995
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!news.kei.com!nntp.coast.net!chi-news.cic.net!uwm.edu!cs.utexas.edu!howland.reston.ans.net!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: More on Talking by Light
Date: 7 Dec 95 15:28:03 GMT
Organization: ucsd usenet gateway
Lines: 30
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

I humbly suggest that 455 KHz is the wrong frequency to choose unless you are
going to use FM.  550 KHz is just as easy to do and then you can use a $7 pocket
radio from radio shack to do the IF.  You can't even get a box to put it in for
$7.  They have something called a flavor radio for $6.99 in the 1994 catalog.
You could use a AM signal to modulate the beam and send the AM from the photo
detector into the antenna of the radio.

On the subject of 4 kids in the same room:

You can do it cheap or you can do it full duplex.

The cheap way simply has everyone listen on the same frequency and only allow
one person to transmit at a time.  If 2 people transmit at the same time nobody
hears anyone else, but we have this now in a lot of communications systems.

One full duplex way is to have 3 receivers on different frequencies for each
child and combine the audio from each receiver into one headset.

Another full duplex way is what was suggested earlier.  It requires 5 receivers
and 5 transmitters for 4 children.  Each child transmits on a unique frequency
to a central repeater.  The central repeater has a receiver for each child's
frequency and combines all 4 signals into one audio signal that is transmitted
on a 5th frequency to all children.

I hope these ideas help.

Ray Mack
WD5IFS
[e-mail]



From Unknown Fri Dec 08 19:16:30 1995
Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!howland.reston.ans.net!vixen.cso.uiuc.edu!uwm.edu!chi-news.cic.net!news.uiowa.edu!uunet!in2.uu.net!nwnews.wa.com!news.halcyon.com!usenet
From: Jay Wicklund <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: More on Talking by Light
Date: Thu, 07 Dec 95 16:14:36 PDT
Organization: Northwest Nexus Inc.
Lines: 16
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: blv-pm12-ip22.halcyon.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage


In article <[e-mail]>,
<[e-mail]> writes:

> I humbly suggest that 455 KHz is the wrong frequency to choose
> unless you are going to use FM.  550 KHz is just as easy to do and
> then you can use a $7 pocket radio from radio shack to do the IF.

As a matter of fact, that was the modulation that I suggested.
Although there is nothing magic about FM, and your ideas for AM
using a cheap radio also sound very attractive.

Jay





From Unknown Fri Dec 08 19:16:31 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!news.cac.psu.edu!ppp2.cac.psu.edu!dlr13
From: [e-mail] (Doug Ripka)
Newsgroups: rec.radio.amateur.homebrew
Subject: NE604 IC
Date: Fri, 8 Dec 1995 08:35:35
Organization: CAC
Lines: 6
Message-ID: <[e-mail]>
NNTP-Posting-Host: ppp2.cac.psu.edu
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B]

I am looking for a source of NE604 IC's.  I need one for the synchronous AM
detector project described in the July 1993 QST.  I can't get hold of the
source listed in the article, Ocean State Electronics.  An help would be
appreciated.

TNX, Doug KA3TTQ


From Unknown Fri Dec 08 19:16:32 1995
Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!infoseek.com!uunet!in1.uu.net!matlock.mindspring.com!usenet
From: [e-mail] (Pieter Ibelings)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Need interconnection cable for HP 8505 Network Analizer
Date: 4 Dec 1995 15:48:10 GMT
Organization: Scientific Atlanta
Lines: 11
Message-ID: <49v57q$[e-mail]>
NNTP-Posting-Host: wave.mindspring.com
Mime-Version: 1.0
X-Newsreader: WinVN 0.99.2
Xref: news.epix.net rec.radio.amateur.equipment:22025 rec.radio.amateur.homebrew:11848

I am in desperate need of a pair of cables that go between the display
unit and the RF unit on the HP 8505 Network Analizers. I just purchased 2
of these and cannot use them because I don't have the cables. Please point
me to where I can get these. The cable has 5 or 6 coax connections and
around 17 other connectors.

73's
Thanks
AC4OP
Pieter Ibelings



From Unknown Fri Dec 08 19:16:33 1995
Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!usenet
From: [e-mail] (Pieter Ibelings)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: Need interconnection cable for HP 8505 Network Analizer
Date: 5 Dec 1995 21:28:16 GMT
Organization: Scientific Atlanta
Lines: 14
Message-ID: <4a2dhg$[e-mail]>
References: <49v57q$[e-mail]>
NNTP-Posting-Host: wave.mindspring.com
Mime-Version: 1.0
X-Newsreader: WinVN 0.99.2
Xref: news.epix.net rec.radio.amateur.equipment:22084 rec.radio.amateur.homebrew:11883


I am in desperate need of a pair of cables that go between the display
unit and the RF unit on the HP 8505 Network Analizers. I just purchased 2
of these and cannot use them because I don't have the cables. Please
point
me to where I can get these. The cable has 5 or 6 coax connections and
around 17 other connectors.

73's
Thanks
AC4OP
Pieter Ibelings




From Unknown Fri Dec 08 19:16:34 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!uwm.edu!msunews!netnews.upenn.edu!netaxs.com!usenet
From: Rocci <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Note for Users of FilDes
Date: Sun, 03 Dec 1995 14:12:33 -0800
Organization: Net Access - Philadelphia's Internet Connection
Lines: 1
Message-ID: <[e-mail]>
References: <49sm2a$[e-mail]>
NNTP-Posting-Host: slip-748.netaxs.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b2a (Windows; I; 16bit)

This site won't accept my anonymous login...any suggestions?


From Unknown Fri Dec 08 19:16:35 1995
Path: news.epix.net!news.sprintlink.net!news.infi.net!solaris.cc.vt.edu!newsfeed.internetmci.com!in1.uu.net!spstimes.sps.mot.com!newsdist.sps.mot.com!newsgate.sps.mot.com!jspc.sps.mot.com!james
From: [e-mail] (James Scott)
Newsgroups: rec.radio.amateur.homebrew
Subject: PC Board - Drilling Tips
Date: Wed, 6 Dec 1995 14:51:24
Organization: MOTOROLA FAE
Lines: 24
Message-ID: <[e-mail]>
References: <49q846$[e-mail]> <4a00tq$[e-mail]>
NNTP-Posting-Host: jspc.sps.mot.com

In article <4a00tq$[e-mail]> [e-mail] (Steve Mason) writes:
...
>Drilling was tougher than I thought, I used my Dremel tool in a Dremel drill
>press stand
>with a #68 bit. I found the bit would wander a bit as it came into contact
>with the
>board, but that if I pressed faster, the bit wandered less.
>The 20pin DIP will be a bit tough to insert, as a few of the holes are off a
>tad, but the
>8 pin DIP, and the rest of the holes are close enough.
>If anybody has any drilling tips, I would like to hear them

I had the same problems - Now I make all my through hole pads like donuts.
I etch-out a small hole in the center of the pad and this makes a perfect
starter.  I usualy make this hole about 0.4mm and drill holes at 0.8mm
A small drill press in mandatory as are extra drills.

Thats All,
James

P.S. BEST WAY TO REACH ME:   [e-mail]
-----------------------------------------------------------
               this is one lousy sig.
-----------------------------------------------------------


From Unknown Fri Dec 08 19:16:35 1995
Path: news.epix.net!news.sprintlink.net!oronet!news
From: [e-mail] (Jim Weir)
Newsgroups: rec.radio.amateur.homebrew
Subject: PC Board Proto:  Resist/Developer
Date: Mon, 04 Dec 1995 18:34:23 GMT
Organization: RST Engineering
Lines: 13
Message-ID: <49vetk$[e-mail]>
NNTP-Posting-Host: rst-engr.oro.net
X-Newsreader: Forte Free Agent 1.0.82

This is the header for the pc board prototype group interested in
resist and developer.

Jim



Jim Weir VP Engineering  | "We seem to be standing on
RST Engineering          |  the foreskin of technology."
Grass Valley CA 95945    | (Gen Chuck Yeager)
voice/fax [phone]   |
[e-mail]  AR Adv WB6BHI  CFI A&G/Comml Inst A&G/A&P/C-182A N73CQ



From Unknown Fri Dec 08 19:16:36 1995
Path: news.epix.net!news.sprintlink.net!oronet!news
From: [e-mail] (Jim Weir)
Newsgroups: rec.radio.amateur.homebrew
Subject: PC Board Proto:  Software
Date: Mon, 04 Dec 1995 18:32:55 GMT
Organization: RST Engineering
Lines: 16
Message-ID: <49veqt$[e-mail]>
NNTP-Posting-Host: rst-engr.oro.net
X-Newsreader: Forte Free Agent 1.0.82

This is the header for the pc board prototype group interested in
software.

Jim
PC Board Proto:  Software
PC Board Proto:  Resist/Developer
PC Board Proto:  Etching & Plating



Jim Weir VP Engineering  | "We seem to be standing on
RST Engineering          |  the foreskin of technology."
Grass Valley CA 95945    | (Gen Chuck Yeager)
voice/fax [phone]   |
[e-mail]  AR Adv WB6BHI  CFI A&G/Comml Inst A&G/A&P/C-182A N73CQ



From Unknown Fri Dec 08 19:16:37 1995
From: Vance Campbell <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PC Board Proto:  Software
Date: 4 Dec 95 20:22:59 GMT
Organization: Novell, Inc.
Lines: 11
Message-ID: <49vlbv$[e-mail]>
References: <49veqt$[e-mail]>
NNTP-Posting-Host: gronk.provo.novell.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Macintosh; I; PPC)
X-URL: news:49veqt$[e-mail]
Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!news3.net99.net!news.cais.net!news.his.com!news.akorn.net!gatech!newsjunkie.ans.net!howland.reston.ans.net!newsserver.jvnc.net!legba.fpk.novell.com!news.fpk.novell.com!uel!gronk.provo.novell.com!grok.provo.novell.com!usenet

It seems like this issue was debated in this newsgroup a month or two
ago, but I missed the conclusion. My employer thinks I should work
during business hours instead of read newsgroups :-{

I am interested in some shareware layout and or schematic software that
is supported on the major platforms so that everyone can use it.

73
Vance WA7ROI




From Unknown Fri Dec 08 19:16:38 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PC Board Proto:  Software
Date: Mon, 04 Dec 95 18:50:10 GMT
Lines: 13
Message-ID: <[e-mail]>
References: <49veqt$[e-mail]> <49vlbv$[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

   Vance Campbell <[e-mail]> wrote:

>I am interested in some shareware layout and or schematic software that
>is supported on the major platforms so that everyone can use it.

Same here.  I downloaded a copy of easytrax.zip and it looks pretty
interesting.  Unfortunately, it won't print to my HP inkjet.  Anyone
know a freeware/shareware layout program that will?  Alternately, is
software available to allow an inkjet to emulate a laserjet?

73,
Jack  WB3U


From Unknown Fri Dec 08 19:16:39 1995
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!news.kei.com!cyberweb.cybersmith.com!news4.ner.bbnplanet.net!news3.near.net!noc.near.net!sunfish.hi.com!brainiac.hi.com!user
From: [e-mail] (Steve Byan)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PC Board Proto:  Software
Date: Wed, 06 Dec 1995 12:29:28 -0400
Organization: Hitachi Computer Products, Inc.
Lines: 10
Message-ID: <[e-mail]>
References: <49veqt$[e-mail]> <49vlbv$[e-mail]>
NNTP-Posting-Host: brainiac.hi.com

> I am interested in some shareware layout and or schematic software that
> is supported on the major platforms so that everyone can use it.

Such software does not exist.

--
Steve Byan                                  internet: [e-mail]
Hitachi Computer Products (America), Inc.
1601 Trapelo Road                           phone: [phone]
Waltham, MA 02154                           FAX: [phone]


From Unknown Fri Dec 08 19:16:40 1995
Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!rfarmer.mindspring.com!rfarmer
From: [e-mail] (Rick Farmer)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PC Board Proto:  Software
Date: Thu, 7 Dec 1995 21:39:02 -0400
Organization: MindSpring Enterprises, Inc.
Lines: 16
Message-ID: <[e-mail]>
References: <49veqt$[e-mail]> <49vlbv$[e-mail]> <[e-mail]>
NNTP-Posting-Host: rfarmer.mindspring.com
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B]

In article <[e-mail]> [e-mail] (WB3U) writes:

>Same here.  I downloaded a copy of easytrax.zip and it looks pretty
>interesting.  Unfortunately, it won't print to my HP inkjet.  Anyone
>know a freeware/shareware layout program that will?  Alternately, is
>software available to allow an inkjet to emulate a laserjet?

 I bought CIRCAD a year ago for $300. Not bad for the price. It has full
schematic capture and layout capabilies, but minimal libraries. I use high
buck stuff now that I do it for a living but I still find it useful for the
quick and dirty hobby scale projects though. A demo version is available on
mobius as I recall. Their BBS is 305-584-7089. Prints to my HP500C nicely. I
just photocopy my output to transfer paper for layout.
Rick Farmer             |  Ratio DesignLab
Electrical Engineer     |  3040 Peachtree Rd.
[e-mail]          |  Atlanta, Ga. 30305 USA


From Unknown Fri Dec 08 19:16:41 1995
Path: news.epix.net!news.sprintlink.net!oronet!news
From: [e-mail] (Jim Weir)
Newsgroups: rec.radio.amateur.homebrew
Subject: PC Board Prototyping
Date: Mon, 04 Dec 1995 18:31:54 GMT
Organization: RST Engineering
Lines: 26
Message-ID: <49vep0$[e-mail]>
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This is merely the announcement that I am starting three new threads
in this newsgroup.  There will be:

PC Board Proto:  Software
PC Board Proto:  Resist/Developer
PC Board Proto:  Etching & Plating

If you all run across a question in another newsgroup about PC board
prototype construction, would you please refer them over to this
group?  I've been collecting information for about three months from
half a dozen newsgroups and can't remember from day to day where the
threads all went.

Thanks for sharing your expertise.

Jim



Jim Weir VP Engineering  | "We seem to be standing on
RST Engineering          |  the foreskin of technology."
Grass Valley CA 95945    | (Gen Chuck Yeager)
voice/fax [phone]   |
[e-mail]  AR Adv WB6BHI  CFI A&G/Comml Inst A&G/A&P/C-182A N73CQ



From Unknown Fri Dec 08 19:16:42 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.Edu.TW!news.cc.nctu.edu.tw!nctuccca.edu.tw!serv.HiNet.net!news.uoregon.edu!news.corpcomm.net!news3.net99.net!news.cais.net!news.his.com!news.akorn.net!gatech!newsfeed.internetmci.com!EU.net!peer-news.britain.eu.net!bcc.ac.uk!news
From: James Mills <jmills>
Subject: Re: PC Board Prototyping
Message-ID: <[e-mail]>
Date: Tue, 5 Dec 1995 12:50:42 GMT
X-Url: news:49vep0$[e-mail]
Content-Transfer-Encoding: 8bit
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References: <49vep0$[e-mail]>
Mime-Version: 1.0
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Organization: University College London
Lines: 29

Dear Jim,

I have found that using PCB software like Easy-PC Plus, then outputting to a
laser printer using OHP transparencies it is quite simple to get artwork good
enough to produce PCBs using a UV light box. The keys is to dramatically reduce
the exposure time, by experimentation. One or two tips,

1) Always put some writing onto the artwork, so that it is easy to work out
which way round its supposed to be as you look at it the wrong way round, if
you see what I mean.

2) If you want the artwork to be a be more permenant and prevent scratching,
spray with Scotchguard or hairspray or similar, note the hairspray trick works
for Letraset as well.

3) For artwork requiring higher density black, ie microwave stuff, print it
twiceand overlay carefully.

4) PCB Photoresist you can by from RS etc, is a waste of time and money cause
youácan't apply it thin or even enough.

Just a few tips from my experience.

Cheers.

James Mills

[e-mail]



From Unknown Fri Dec 08 19:16:43 1995
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!usenet.kornet.nm.kr!agate!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (The2X4)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PC Board Prototyping - Ham Style
Date: 3 Dec 1995 13:31:35 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 5
Sender: [e-mail]
Message-ID: <49sqe7$[e-mail]>
References: <49q846$[e-mail]>
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X-Newsreader: AOL Offline Reader

I've got a few suggestions but I'll wait for you to begin......


Carl
The2x4


From Unknown Fri Dec 08 19:16:44 1995
Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!rfarmer.mindspring.com!rfarmer
From: [e-mail] (Rick Farmer)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PC Board Prototyping - Ham Style
Date: Mon, 4 Dec 1995 23:45:04 -0400
Organization: MindSpring Enterprises, Inc.
Lines: 20
Message-ID: <[e-mail]>
References: <49q846$[e-mail]>
NNTP-Posting-Host: rfarmer.mindspring.com
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In article <49q846$[e-mail]> [e-mail] (Jim Weir) writes:

>My proposal is to start three threads:  PCB software, PCB resists, and
>PCB etching.  If anybody objects to me starting these threads in this
>newsgroup, say so now.  If anybody has other major topics they'd like
>to add to the threads, say so now.
>Otherwise on Monday morning...

 Hmm. Well Jim you seem hell bent on STARTING A NEW GROUP. FYI UNIX no longer
has the lock on the capture/layout market. The top 2 UNIX player are now
releasing NT version, one of which I'll probably buy. The really big problem
though is the parts. Have you ever "homebrewed" a board that takes TSOPs? Just
wait until BGA goes mainstream, theres no way in hell you can whip up a
prototype board to eval those things in an afternoon. I don't want to sound
discouraging but I have no problem with 50 mil SOICs or 0805 discretes. Its
just that you can't route them very tight or run them very fast without your
internal layers.
Rick Farmer             |  Ratio DesignLab
Electrical Engineer     |  3040 Peachtree Rd.
[e-mail]          |  Atlanta, Ga. 30305 USA


From Unknown Fri Dec 08 19:16:45 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!olivea!bug.rahul.net!a2i!sierra.net!psyber.com!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PC Board Prototyping - Ham Style
Date: 5 Dec 1995 16:28:25 GMT
Organization: Psyberware Internet Access
Lines: 58
Message-ID: <4a1rv9$[e-mail]>
References: <49q846$[e-mail]>
NNTP-Posting-Host: where-no-man-has-gone-before.psyber.com
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

>   [e-mail] (Jim Weir) writes:
>
>  I'd like to get a thread started on the cheap and easy ways to do
>  prototype PC boards.  I started asking questions on the CAD newsgroups
>  and those folks are so bound up with workstations and thousand dollar
>  autorouter programs that they just don't understand those of us using
>  laser printers and fishtank etchers.  I've gotten some damned good
>  advice and some absolute trash.
>
>  My proposal is to start three threads:  PCB software, PCB resists, and
>  PCB etching.  If anybody objects to me starting these threads in this
>  newsgroup, say so now.  If anybody has other major topics they'd like
>  to add to the threads, say so now.
>
>  Otherwise on Monday morning...
>
>  Jim
>
>
>
>  Jim Weir VP Engineering  | "We seem to be standing on
>  RST Engineering          |  the foreskin of technology."
>  Grass Valley CA 95945    | (Gen Chuck Yeager)
>  voice/fax [phone]   |
>  [e-mail]  AR Adv WB6BHI  CFI A&G/Comml Inst A&G/A&P/C-182A N73CQ
>
>
>>>>
There are several of us here in the area who are using EAGLE
for PC board design and schematic capture. It is a low cost
package ($500 for 16 bit , $1197 for 32 bit versions) with a
really excellent autorouter - the best I have seen. It is the #1
PC-based PC board design package in Europe. (It is a German
import, but you would never know it.) It's main weakness is
the lack of heirarchical schematic design. I have used it to
do my DSP boards (see the '96 ARRL Handbook).

I bought it after looking at a lot of different packages, and I
don't regret it.

At the time, I almost bought the Orcad package with their
router which would have cost $3000. But, Orcad has a $600
annual "maintenance fee." So for $1200 for Eagle, I figured
I could buy it, use it for two years, and if I didn't like it, throw
it away, buy Orcad, and not be out any money. In other words,
two years' worth of "maintenance fees" pay for Eagle, which
has free support.

EAGLE is distributed by Cadsoft, 800-858-8355

73,

Dave Hershberger, W9GR
Principal Engineer
Continental Electronics, Inc.
Nevada City, California
internet: [e-mail]



From Unknown Fri Dec 08 19:16:47 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netcom.com!source
From: [e-mail] (David Harmon)
Subject: Re: PC Board Prototyping - Ham Style
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
References: <49q846$[e-mail]> <4a00tq$[e-mail]>
Date: Wed, 6 Dec 1995 00:07:45 GMT
Lines: 14
Sender: [e-mail]

In article <4a00tq$[e-mail]>, Steve Mason <[e-mail]> wrote:
>Drilling was tougher than I thought, I used my Dremel tool in a Dremel
drill press stand >with a #68 bit. I found the bit would wander a bit as
it came into contact with the >board, but that if I pressed faster, the
bit wandered less.

Did you leave a hole in the middle of each pad to help start the drill?
I usually don't have too much trouble with the drill wandering if I do
that.  Easytrax has an option to adjust the size of the hole.

There are steel drills and carbide drills.  Carbide drills are supposed
to stay sharp longer while drilling abrasive material like fiberglass
reinforced board.  But they break so easily that I've never had a chance
to find out if it's true.  I get more use from the cheaper steel drills.


From Unknown Fri Dec 08 19:16:48 1995
Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!rfarmer.mindspring.com!rfarmer
From: [e-mail] (Rick Farmer)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PC Board Prototyping - Ham Style
Date: Wed, 6 Dec 1995 21:04:20 -0400
Organization: MindSpring Enterprises, Inc.
Lines: 17
Message-ID: <[e-mail]>
References: <49q846$[e-mail]> <4a00tq$[e-mail]> <[e-mail]>
NNTP-Posting-Host: rfarmer.mindspring.com
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B]

>In article <4a00tq$[e-mail]>, Steve Mason <[e-mail]> wrote:
>Drilling was tougher than I thought, I used my Dremel tool in a Dremel
>drill press stand with a #68 bit. I found the bit would wander a bit as
>it came into contact with the board, but that if I pressed faster, the
>bit wandered less.

 I have an elegant solution to that problem.
Flow solder over the pad. The trick is to put enough down to form a doughnut
of solder on the pad without it doming over the whole pad. The "doughnut" of
solder acts as a guide for the bit and protects the pad. It's a lot easier if
you flux up the copper first. I used to be a fan of brush on alcohol based
flux but the water soluble flux pens & solder you get out of digi-key work
great once you get the nack of it. They clean up easily too, no HAZMAT to
worry about.
Rick Farmer             |  Ratio DesignLab
Electrical Engineer     |  3040 Peachtree Rd.
[e-mail]          |  Atlanta, Ga. 30305 USA


From Unknown Fri Dec 08 19:16:49 1995
Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!rfarmer.mindspring.com!rfarmer
From: [e-mail] (Rick Farmer)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PC Board Prototyping - Ham Style
Date: Wed, 6 Dec 1995 21:20:48 -0400
Organization: MindSpring Enterprises, Inc.
Lines: 25
Message-ID: <[e-mail]>
References: <49q846$[e-mail]> <4a00tq$[e-mail]>
NNTP-Posting-Host: rfarmer.mindspring.com
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B]

In article <4a00tq$[e-mail]> [e-mail] (Steve Mason) writes:
> Funny you should ask, your timing is impeccable.
<snip>
>By the way, for anyone not familiar with the product, PnP Blue is a plastic 8.5x11 sheet
<snip>
>There's been some talk about making boards with various toner transfer methods lately,
>so I thought I'd post my experience.
<snip>
>Placed sheet on board and applied the iron.  Big problem!
>The sheet wrinkled, crinkled and did everything but melt (probably would have had I continued)
>I decided I was using too much heat.

Indeed you were.

I use a paper base system at work to pump out quick and dirty proto
boards for testing before I release by stuff to the board house. The paper
doesn't shrink or warp as much as the plastic based stuff. Even with the paper
and a good press I'd say 5x7 inches is the limit for double sided boards
before registration errors get too bad. Good news SMT parts are now pretty
much standard, use them, no drilling! Use 1206 zero ohm resistors to
"jump" over a trace instead of a set of vias.

Rick Farmer             |  Ratio DesignLab
Electrical Engineer     |  3040 Peachtree Rd.
[e-mail]          |  Atlanta, Ga. 30305 USA


From Unknown Fri Dec 08 19:16:50 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!lamarck.sura.net!news.cc.ucf.edu!usenet
From: [e-mail] (scottc)
Newsgroups: rec.radio.amateur.homebrew
Subject: pc board routing program
Date: 7 Dec 1995 16:03:39 GMT
Organization: University of Central Florida
Lines: 5
Message-ID: <4a738r$[e-mail]>
NNTP-Posting-Host: 132.170.21.102
Mime-Version: 1.0
X-Newsreader: WinVN 0.99.4

Does anyone know of a good check pcb board routing program?

I downloaded easytrak and autotrak but they seem to be complicated to
use.



From Unknown Fri Dec 08 19:16:51 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!uwm.edu!src.honeywell.com!not-for-mail
From: Jerry Roush <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PCB Etching Question???
Date: 5 Dec 1995 10:14:25 CST
Organization: Honeywell Technology Center, Phoenix
Lines: 27
Message-ID: <4a1r51$[e-mail]>
References: <49j6li$[e-mail]> <4a1qrd$[e-mail]>
NNTP-Posting-Host: jrausch.cto.az.honeywell.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2N (Windows; I; 16bit)

[e-mail] (Chris Findley) wrote:
>I was wondering is if anyone could give any pointers as to what temp
>(if you use ferric chloride) the solution should be maintained at >during the etching process???

I find that it works well at about 105 F (~33 C).

> Also, and most important: What can I use to mask
>large areas of the board with??? I am familiar with the photo etch,the
>lazer toner thing,and resist ink pens. the only one i can use in my
>current situation is resist ink.Could I use masking tape or some sort
>of mac-tac(TM) material to mask these large portions of the board???
>
>I would waste an entire ink pen on just one board,i'm sure.It's not >really practical to use it!

 I have used many methods, but I have found that plain ol'
black electrical tape works well for large areas (> 1x1 cm).
For smaller "large" areas, some electrical parts houses
sell a black paper tape, almost like narrow masking tape.
It is very similar to artwork tape for drafting.  However,
if the ferric chloride gets too hot, the adhesive has a
tendency to soften, causing _problems_.

Good Luck,

.Jerry  <><




From Unknown Fri Dec 08 19:16:52 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news1!ts04-ind-23
From: [e-mail] (Mike Cline)
Subject: Re: PCB Etching Question???
X-Nntp-Posting-Host: ts04-ind-23.iquest.net
Message-ID: <[e-mail]>
Sender: [e-mail] (News Admin)
Organization: IQuest Internet, Inc.
X-Newsreader: News Xpress Version 1.0 Beta #2.1
References: <49j6li$[e-mail]> <4a1qrd$[e-mail]> <4a1r51$[e-mail]>
Date: Thu, 7 Dec 1995 01:29:44 GMT
Lines: 34

Jerry Roush <[e-mail]> wrote:
>[e-mail] (Chris Findley) wrote:
>>I was wondering is if anyone could give any pointers as to what temp
>>(if you use ferric chloride) the solution should be maintained at >during the etching process???
>
>I find that it works well at about 105 F (~33 C).
>
>> Also, and most important: What can I use to mask
>>large areas of the board with??? I am familiar with the photo etch,the
>>lazer toner thing,and resist ink pens. the only one i can use in my
>>current situation is resist ink.Could I use masking tape or some sort
>>of mac-tac(TM) material to mask these large portions of the board???
>>
>>I would waste an entire ink pen on just one board,i'm sure.It's not >really practical to use it!
>
> I have used many methods, but I have found that plain ol'
>black electrical tape works well for large areas (> 1x1 cm).
>For smaller "large" areas, some electrical parts houses
>sell a black paper tape, almost like narrow masking tape.
>It is very similar to artwork tape for drafting.  However,
>if the ferric chloride gets too hot, the adhesive has a
>tendency to soften, causing _problems_.
>
>Good Luck,
>
>..Jerry  <><
>
>
I use plain old quick drying spray paint for ground planes
and a paint pen or brush and model paint for more precise
areas, and it works fine.

Mike Cline
N9RJW


From Unknown Fri Dec 08 19:16:53 1995
Path: news.epix.net!news.sprintlink.net!news.telalink.net!SANDH.COM
From: [e-mail].([e-mail] ([e-mail] (kees)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PCB Etching Question???
Date: 7 Dec 95 05:33:51
Organization: Telalink Corporation, Nashville, TN, USA
Lines: 30
Message-ID: <[e-mail]>
NNTP-Posting-Host: ng.sandh.com
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 8BIT

Path: news.telalink.net!news.sprintlink.net!howland.reston.ans.net!news.nic.surfnet.nl!news.wau.nl![e-mail]
From: [e-mail] (Kees de Groot, Agricultural University, Wageningen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PCB Etching Question???
Date: 7 Dec 1995 11:33:51 GMT
Organization: Wageningen Agricultural University
Lines: 19
Message-ID: <4a6jev$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: rvd.wau.nl

to cover an area on a board before etching
i used my sister's nail-paint


Tel. +31-317-   Kees de Groot  ([e-mail])      THERE AINT NO
483557 (direct) Computer Assisted Education              SUCH THING AS
484343 (secr.)  Agricultural University, Hollandseweg 1  A FREE LUNCH!
Fax: 484763     6706 KN  Wageningen, the Netherlands
                X25:    PSI%([phone]::DEGROOT
disclaimer:     I always speak for myself
- if you go too far to the east, you find yourself in the west ..  -

Tel. +31-317-   Kees de Groot  ([e-mail])      THERE AINT NO
483557 (direct) Computer Assisted Education              SUCH THING AS
484343 (secr.)  Agricultural University, Hollandseweg 1  A FREE LUNCH!
Fax: 484763     6706 KN  Wageningen, the Netherlands
                X25:    PSI%([phone]::DEGROOT
disclaimer:     I always speak for myself
- if you go too far to the east, you find yourself in the west ..  -


From Unknown Fri Dec 08 19:16:54 1995
Path: news.epix.net!news.sprintlink.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!galaxy.ucr.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Peter L. Williamson)
Newsgroups: rec.radio.amateur.homebrew
Subject: PCB Manufacture
Date: 6 Dec 95 06:49:50 GMT
Organization: ucsd usenet gateway
Lines: 20
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Hello all, I thought I might add my experiences making Photo PCB'S.
First,Easytrax is a shareware version of PROTEL's AUTOTRAX which has a
laserjet driver which works fine with my HP DESKJET 540.  Alternatively you
can output a HPGL file to disk and use one of the many HPGL to printer
programs.  I use a commercial one called PRINTIT which allows printing of
the colour overlays as well.  Try your local BBS as I have seen many but
didnt bother as PRINTIT did everything I needed.
I have had great success printing directly to PCB through the PAPER PRINT --
YEP! it works great, just increase exposure time around double.
I have used ELECTROLUBE PRA200H positive photo resist for years with great
success.
I have 200ML spray cans which cost AUST$35 a can, although they do make a
100 mL can.
A little goes a long way so is not expensive.  For developer I use a mild
Caustic soda solution, about a level teaspoon to 1 Liter of water, no
expensive developer needed although ELECTROLUBE sells on which doesn't work
any better.
I hiope this is of some help, 73's from the mad homebrewer (both types)
Peter L. Williamson VK4AWP  [e-mail]



From Unknown Fri Dec 08 19:16:55 1995
Path: news.epix.net!news.sprintlink.net!mhv.net!news.westnet.com!news.internetMCI.com!newsfeed.internetmci.com!EU.net!peer-news.britain.eu.net!demon!mail2news.demon.co.uk!kanga.demon.co.uk
From: Dick G0BPS <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: PCB's the easy way?
Date: Wed, 06 Dec 95 11:03:18 GMT
Organization: Unorganised
Lines: 29
Message-ID: <[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: kanga.demon.co.uk
X-Newsreader: Demon Internet Simple News v1.29
X-SMTP-Posting-Host: kanga.demon.co.uk [Wed, 6 Dec 95 21:44:55 GMT]
X-SMTP-Posting-Host: post.demon.co.uk [Wed, 6 Dec 95 21:46:34 GMT]


Hi Gang,

I have all my PCB's made professionally, but occasionally
I have to make a 'one off'. These can be made with the aid
of a laser printer or photocopier.  Using your CAD program
draw out the circuit you require and flip it. So that you
are looking at it from the component side. Print it on the
laser printer, or if other printer, photocopy the result.
This is because you want a thin plastic film such as these
use. Place the laser print or copy on your PC board and
wait for the wife to go shopping.  Take the family iron
and set it to its highest heat setting.

Wait a few minutes, and then iron the the print onto the
board. The outline will be transferred to the board.

OK the edges will be a little rough, but the result will
work providing the tracks are not too thin, or too close.

Then etch as usual.

TTFN de Dick G0BPS

(Kanga Products)





From Unknown Fri Dec 08 19:16:56 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!nntp.coast.net!news.kei.com!newsfeed.internetmci.com!in2.uu.net!news.alt.net!news1.alt.net!news.aros.net!usenet
From: [e-mail] (Douglas L. Datwyler)
Newsgroups: rec.radio.amateur.homebrew
Subject: Quick and dirty demostration of AM
Date: 8 Dec 1995 13:57:18 GMT
Organization: ArosNet Inc.
Lines: 7
Message-ID: <4a9g80$[e-mail]>
NNTP-Posting-Host: anp17.aros.net
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.5

I need to know of a quick and dirty (EASY) demostration of AM modulation for
an upcoming Boy Scout round table. HINTS, or outright answers are welcome.


Douglas L. Datwyler  WR7O
[e-mail]



From Unknown Fri Dec 08 19:16:57 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.msfc.nasa.gov!bcm.tmc.edu!news.tamu.edu!news
From: [e-mail] (Harry Howell)
Newsgroups: rec.radio.amateur.homebrew
Subject: RADAR DETECTOR DETECTOR??
Date: 6 Dec 1995 20:09:10 GMT
Organization: Texas A&M Entomology
Lines: 4
Message-ID: <4a4t96$[e-mail]>
NNTP-Posting-Host: gold2.tamu.edu
X-Newsreader: WinVN 0.92.6+

I saw a Radio Shack ad for a speed radar dectector with "ghost" technology. This "ghost technology" will defeat radar dectector dectectors. I know you can

Thanks for your input.
Harry in TX KA5IMO


From Unknown Fri Dec 08 19:16:58 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!uwm.edu!homer.alpha.net!pacifier!news
From: jgoecks <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RADAR DETECTOR DETECTOR??
Date: 7 Dec 1995 06:25:48 GMT
Organization: Pacifier BBS, Vancouver, Wa.  ([phone])
Lines: 26
Message-ID: <4a61dc$[e-mail]>
References: <4a4t96$[e-mail]>
NNTP-Posting-Host: ip66.van3.pacifier.com

[e-mail] (Harry Howell) wrote:
>
> I saw a Radio Shack ad for a speed radar dectector with "ghost"
> technology. This "ghost technology" will defeat radar dectector
> dectectors. I know you can locate a receiver by its local
> oscillator, but do the police use something like this? What is
> the range of these radar detector detectors? Is it so short ranged
> that the police carry them up to the suspect vehicle/
>
> Thanks for your input.
> Harry in TX KA5IMO




I have heard rumors that the police radar gun itself will detect
some radar detector's local oscillator.  A well made detector such
as the one you describe should be invisible to the radar gun.







Jim


From Unknown Fri Dec 08 19:16:59 1995
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Frank Bures)
Subject: Re: RADAR DETECTOR DETECTOR??
Sender: [e-mail] (USENET news)
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Date: Thu, 7 Dec 1995 13:46:09 GMT
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In <4a4t96$[e-mail]>, [e-mail] (Harry Howell) writes:
>I saw a Radio Shack ad for a speed radar dectector with "ghost" technology. This "ghost technology" will defeat radar dectector dectectors. I know you ca
ange of these radar detector detectors? Is it so short ranged that the police carry them up to the suspect vehicle/
>
>Thanks for your input.
>Harry in TX KA5IMO

I am quite familiar with a device manufactured in
Mississauga, ON. The device is  essentially a receiver tuned
to the first intermediate frequency of a radar detector. It
is pretty sensitive. During test conducted by the Ontario
Provincial Police the range of the device was anywhere from
300 to 1000m.

Frank Bures, Dept. of Chemistry, University of Toronto
[e-mail]
[e-mail]



From Unknown Fri Dec 08 19:17:00 1995
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From: Jon Himsel <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,alt.radio.pirate
Subject: RAMSEY TV-6
Date: 5 Dec 1995 13:34:48 GMT
Organization: St. Meinrad College
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Message-ID: <4a1hpo$obj$[e-mail]>
Xref: news.epix.net rec.radio.amateur.homebrew:11872 alt.radio.pirate:12726

Can anyone tell me how to modify the Ramsey TV-6 so it only Xmits on
channel 3?? The thing drifts so much that this mod (if possible)
would make it much easier to tune. Thanks for any help!


From Unknown Fri Dec 08 19:17:01 1995
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From: [e-mail] (JGolenia)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RAMSEY TV-6
Date: 6 Dec 1995 05:30:05 -0500
Organization: America Online, Inc. (1-800-827-6364)
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In article <4a1hpo$obj$[e-mail]>, Jon Himsel
<[e-mail]> writes:

>Can anyone tell me how to modify the Ramsey TV-6 so it only Xmits on
>channel 3?? The thing drifts so much that this mod (if possible)
>would make it much easier to tune. Thanks for any help!
>
>

I can't tell you that, but I can tell you that I put a 75 ohm resistor
between ground and the antenna pad (as suggested in a book on Virtual
Reality I had). Up to that point I thought the xmitter was a peice of
s___. This little mod cleaned up the signal so well, it is better than the
local cable company's. I plan on making a filter for it some day, but I
don't know what freq to make it for. Anyone?

Jeff


From Unknown Fri Dec 08 19:17:02 1995
Newsgroups: rec.radio.amateur.homebrew
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From: James Mills <jmills>
Subject: RE : PCB Debate
Message-ID: <[e-mail]>
Date: Tue, 5 Dec 1995 12:56:00 GMT
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Dear All,

Does anybody know what the dielectric constant of normal fibre-glass PCB that
you can by from RS etc, interested for microwaves and things!!


Cheers

James Mills

[e-mail]



From Unknown Fri Dec 08 19:17:05 1995
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From: "James P. Meyer" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RE : PCB Debate
Date: Wed, 6 Dec 1995 10:42:39 -0500
Organization: Duke University, Durham, NC, USA
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On Tue, 5 Dec 1995, James Mills wrote:

> Does anybody know what the dielectric constant of normal fibre-glass PCB that
> you can by from RS etc, interested for microwaves and things!!

        I've seen 3.2 listed somewhere.  I made my own measurements and
came up with a figure closer to 4.0

        Since you'll probably need to tweak and tune anyway, those
figures should be close enough to get your design started.

        Jim




From Unknown Fri Dec 08 19:17:06 1995
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Mike Cline)
Subject: Re: RE : PCB Debate
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Date: Thu, 7 Dec 1995 01:25:23 GMT
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James Mills <jmills> wrote:
>Dear All,
>
>Does anybody know what the dielectric constant of normal fibre-glass PCB that
>you can by from RS etc, interested for microwaves and things!!
>
>
>Cheers
>
>James Mills
>
>[e-mail]
>
I've seen it published at 4.7 and 4.8, The only problems with
using G10 is that it is rather lossy at microwave frequencies
and also the dielectric constant is NOT a controlled parameter
of the material, so it may vary from batch to batch. I've had
good results at 1.3Ghz with it though.

Mike CLine
N9RJW


From Unknown Fri Dec 08 19:17:07 1995
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From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RE : PCB Debate
Date: 8 Dec 1995 15:14:37 GMT
Organization: Digital Equipment Corporation
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Distribution: world
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NNTP-Posting-Host: kali.enet.dec.com


>Article 12174 of rec.radio.amateur.homebrew:
>In-Reply-To: <[e-mail]>

>On Tue, 5 Dec 1995, James Mills wrote:

>> Does anybody know what the dielectric constant of normal fibre-glass PCB that
>> you can by from RS etc, interested for microwaves and things!!

>       I've seen 3.2 listed somewhere.  I made my own measurements and
>came up with a figure closer to 4.0

The dielectric constant of ordinary green PCB is between 3.9 and 4.3, your
measurements were good.  It varies depending on the ratio of fiberglass to
epoxy (I think they put in more of whichever is cheaper that day!).

>       Since you'll probably need to tweak and tune anyway, those
>figures should be close enough to get your design started.

should be close enough to get you started.  you don't want to use it for
too high in the microwaves, anyway.  I recall measuring about 0.75 dB for
a 3 dB branch line hybrid at 2304 MHz.

paul N1BWT






From Unknown Fri Dec 08 19:17:08 1995
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From: [e-mail] (Glenn Hansen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Resistor for RF power attenuator help needed
Date: Tue, 5 Dec 1995 08:26:12 GMT
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I need to build an attenuator to drop my transceivers' 10 watts to less than 5
watts. I plan on using a pi-network resistive attenuator, I know the values
but I don't know what type/kind of resistor to use.  Looking through my Mouser
catalog I see axial lead vitreous enamel coated, lug a lead fixed resistors
and such animals. I don't have a clue what to use.



                                                  Thanks

                                                                 Glenn   KB7PKC



From Unknown Fri Dec 08 19:17:09 1995
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From: "Thomas C. J. Sefranek" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Resistor for RF power attenuator help needed
Date: 7 Dec 1995 00:49:32 GMT
Organization: SRC
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To: [e-mail]

Glenn,
      You need to understand that RF resistors cannot be wire-wound!
They exhibit too much inductance!  You will need special power resistors
to make a good attenuator.  It is non-trivial to build a good RF
attenuator, thats why they cost so much!

Tom




From Unknown Fri Dec 08 19:17:10 1995
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usenet
From: Wes Stewart <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Resistor for RF power attenuator help needed
Date: 7 Dec 1995 04:01:52 GMT
Organization: Arizona Daily Star - AZSTARNET
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To: [e-mail]

[e-mail] (Glenn Hansen) wrote:
>I need to build an attenuator to drop my transceivers' 10 watts to less than 5
>watts. I plan on using a pi-network resistive attenuator, I know the values
>but I don't know what type/kind of resistor to use.  Looking through my Mouser
>catalog I see axial lead vitreous enamel coated, lug a lead fixed resistors
>and such animals. I don't have a clue what to use.
>
Glenn,
You should use either carbon film, carbon composition or perhaps in the
low values you require, metal film. You don't mention the frequency range of
your transceiver but I assume it's HF or VHF so axial leads will be OK
if kept short.

Because you want to use a pi, the nearest standard values are 300 ohm for the
shunt and 18 for the series. You will obviously be dissipating 5 watts, so the
power ratings should be capabile of handling this. I would suggest using parallel
combinations of lower wattage resistors. If you use good construction techniques,
you can obtain a reasonable SWR into the low VHF region. If you don't mind
dissymmetry, you can use lower wattage parts on the output side.

Good luck and 73,

Wes -- N7WS



From Unknown Fri Dec 08 19:17:11 1995
Path: news.epix.net!news.sprintlink.net!news.accessone.com!ghansen.accessone.com!ghansen
From: [e-mail] (Glenn Hansen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Resistor for RF power attenuator help needed
Date: Thu, 7 Dec 1995 06:57:02 GMT
Organization: .tacoma.link
Lines: 31
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References: <[e-mail]> <4a5ovg$[e-mail]>
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X-Newsreader: Trumpet for Windows [Version 1.0 Rev A]

In article <4a5ovg$[e-mail]> Wes Stewart <[e-mail]> writes:
Thanks Wes. The response to my question has lead to quite a few replies in the
E-mail. This group is GREAT!  With your information and the information sent
to me by others I feel I now have the info to carry on.

BTW, the frequency range is 14 Mhz, 20 meters. Should work out just fine.
Looks I will be putting some carbon resistors in parallel. Thanks.


73     Glenn                 KB7PKC

>Glenn,
>You should use either carbon film, carbon composition or perhaps in the
>low values you require, metal film. You don't mention the frequency range of
>your transceiver but I assume it's HF or VHF so axial leads will be OK
>if kept short.

>Because you want to use a pi, the nearest standard values are 300 ohm for the
>shunt and 18 for the series. You will obviously be dissipating 5 watts, so the
>power ratings should be capabile of handling this. I would suggest using
>parallel
>combinations of lower wattage resistors. If you use good construction
>techniques,
>you can obtain a reasonable SWR into the low VHF region. If you don't mind
>dissymmetry, you can use lower wattage parts on the output side.

>Good luck and 73,

>Wes -- N7WS




From Unknown Fri Dec 08 19:17:12 1995
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Resistor for RF power attenuator help needed
Date: 8 Dec 1995 09:10:45 -0500
Organization: America Online, Inc. (1-800-827-6364)
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Sender: [e-mail]
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In article <4a5dnf$[e-mail]>, "Thomas C. J. Sefranek"
<[e-mail]> writes:

>Glenn,
>      You need to understand that RF resistors cannot be wire-wound!
>They exhibit too much inductance!  You will need special power resistors
>to make a good attenuator.  It is non-trivial to build a good RF
>attenuator, thats why they cost so much!
>
>Tom

And you need to understand just because a resistor is metal film, carbon,
or labeled non-inductive it may not necessarily be so in real life.

Nearly ALL  carbon and metal film resistors have elements wound in a
spiral, and the higher power resistors "fall apart" in the upper HF
region. This is a huge problem in parasitic supressor design, and
applications like yours.

You can cut the resistor open and look at the element, or measure it on a
SWR analyzer to verify the quality of the component.

Most companies order special resistors for RF load and attenuator
applications. You will be better off using an array of small resistors, or
ordering special components, than randomly using 2 or 5 watt components.
The larger the component, the more likely it is you will run into this
problem.

73 Tom


From Unknown Fri Dec 08 19:17:13 1995
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Dave Kirkby)
Subject: S parameters -> FET model
Sender: [e-mail] (Usenet News System)
Message-ID: <[e-mail]>
Date: Wed, 6 Dec 1995 16:58:48 GMT
Reply-To: [e-mail]
Organization: UCL Dept of Medical Physics
Lines: 47

I've seen some posts recently reguarding the S-parameters of a FET at a low
frequency. One method I've thought of to get these, without access to a vector
network analyser (VNA) is to assume a reasonably decent model for the FET, having as
a bare minimum the gate resistance Rg, input capacitance Cin, output resistance Ro,
output capacitance Co, plus the feedback capacitance Cfb. It would be better to
include also the parasistic components - ie package inductance etc.

Simple model of a High-frequency FET:


Gate-----------Rg------------   Cfb ----------------------------- Drain
                         |              |          |
                        Cin             Ro         Co
                         |              |          |
Source ---------------------------------------------------------------

Then fit (non-linear least squares ???) the S-parameters at higher frequencies
(from the data sheet) to the FET model, to get the  physical values of the Rg, Cin,
Ro, Co & Cfb. Once you know these, finding the S-parameters at any frequency would be trivual. Finding the optimum source impedance would also be possible
figure could not be estimated though.

Anyone ever managed to do this? I've read about it (Pengelly, Microwave MESFETS), but don't have any software myself, and feel it would take a decent whil
perhaps not too long. The book 'Numerical Recipes in C' by Press et al has fitting
algoritms already coded.

Obviously measurements of S-parameters would always be better, but given few amateurs
have access to a VNA, but many can write computer programs, this might be a useful
method to estimate S-parameters at frequencies not on the data sheet, using the
physics of the device, rather than extrapolation of the data sheet values, which
is always risky.

One would  have to guestimate the magnitude of S21, but all other S-paramters could
be determined once the physical parameters of the FET are known.


---
Dave Kirkby
Dept of Medical Physics,
University College London,
11-20 Capper St,
London WC1E 6JA
Tel: [phone]
Fax: [phone]






From Unknown Fri Dec 08 19:17:15 1995
Path: news.epix.net!news.sprintlink.net!news.heurikon.com!news.dpc.net!novia!news.inc.net!uwm.edu!chi-news.cic.net!news.nd.edu!peabody
From: [e-mail] (Marc D. Cozzi)
Newsgroups: rec.radio.amateur.homebrew
Subject: Schema-PCB design output
Date: Wed, 06 Dec 95 00:49:57 GMT
Organization: Univ. of Notre Dame Radiation Lab.
Lines: 21
Message-ID: <4a2pb0$[e-mail]>
NNTP-Posting-Host: peabody.rad.nd.edu
Summary: What are people using?
Keywords: schema PCB
To: world
X-Newsreader: News Xpress Version 1.0 Beta #3


I have been using a combination of Omation's Schema and
WinTek's Smartwork for schematic and PCB design for several
years. Now we are looking at the Schema-PCB package for
generating printed circuit boards. Up to now we have been using
a Houston pen plotter with fairly good results.
What I would like to know is what other people are using for PCB
layout. All the way from Omation/Tango Schema to the photo resist.

Is it possible to use laser printers on mylar/vellum?
Should I be looking for 600 DPI printers instead of 300 DPI
Is HP's Enhanced Resolution worth it
and on and on...

Any suggestions welcome.

Thanks

Marc Cozzi
Univ. of Notre Dame     [e-mail]



From Unknown Fri Dec 08 19:17:16 1995
Path: news.epix.net!news.sprintlink.net!oronet!news
From: [e-mail] (Jim Weir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Schema-PCB design output
Date: Wed, 06 Dec 1995 16:42:40 GMT
Organization: RST Engineering
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[e-mail] (Marc D. Cozzi) wrote:


>I have been using a combination of Omation's Schema and
>WinTek's Smartwork
[snip in consideration of bandwidth]

This question would really go well in PC Proto:  Software in this
newsgroup.

Jim



Jim Weir VP Engineering  | "We seem to be standing on
RST Engineering          |  the foreskin of technology."
Grass Valley CA 95945    | (Gen Chuck Yeager)
voice/fax [phone]   |
[e-mail]  AR Adv WB6BHI  CFI A&G/Comml Inst A&G/A&P/C-182A N73CQ



From Unknown Fri Dec 08 19:17:17 1995
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From: [e-mail] (Steve Byan)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Schema-PCB design output
Date: Thu, 07 Dec 1995 12:37:26 -0400
Organization: Hitachi Computer Products, Inc.
Lines: 15
Message-ID: <[e-mail]>
References: <4a2pb0$[e-mail]> <4a4h4h$[e-mail]>
NNTP-Posting-Host: brainiac.hi.com

In article <4a4h4h$[e-mail]>, [e-mail] (Jim Weir) wrote:
> This question would really go well in PC Proto:  Software in this
> newsgroup.

An even better newsgroup would be sci.electronics.cad, which was created
specifically to discuss these issues.

Regards,
-Steve

--
Steve Byan                                  internet: [e-mail]
Hitachi Computer Products (America), Inc.
1601 Trapelo Road                           phone: [phone]
Waltham, MA 02154                           FAX: [phone]


From Unknown Fri Dec 08 19:17:18 1995
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From: Don Rotolo <[e-mail]>
Newsgroups: sci.electronics,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc,de.comm.ham
Subject: Re: Serial-to-Parallel Converter
Date: Wed, 06 Dec 95 12:13:17 PDT
Lines: 13
Message-ID: <[e-mail]>
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In article <4a383p$a74$[e-mail]>,
> I'm trying to find either an IC or a schematic for converting
> serial-parallel.

Brian,
Don't bother building one when you can buy one - about $90 from
Global Computer Supplies 800-845-6225.

Of course, a used serial printer at a hamfest would be cheaper than that.

Don N2IRZ



From Unknown Fri Dec 08 19:17:19 1995
Newsgroups: de.comm.ham,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew,rec.radio.amateur.misc,sci.electronics
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From: [e-mail] (Larry DeSoto)
Subject: Re: Serial-to-Parallel Converter
Message-ID: <[e-mail]>
Sender: [e-mail]
Nntp-Posting-Host: atl.com
Organization: Advanced Technology Laboratories
References:  <4a383p$a74$[e-mail]>
Date: Wed, 6 Dec 1995 18:34:31 GMT
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In article <4a383p$a74$[e-mail]>, Brian Webb <[e-mail]> writes:
> I'm trying to find either an IC or a schematic for converting
> serial-parallel.
>
> I own a solid state radioteletype decoder (circa 1980) designed
> to work with serial printers. However, my printer, like virtually
> all others is parallel.

You need a Universal Asynchronous Receiver Transmitter (UART).  One
entirely satisfactory device I've used is a Giant AY-1013.  This is
an old device and I don't know if they are still being manufactured.
If you can get one, it is easy to use in that it requires minimal
support (a clock and maybe a level converter for the serial line).

--
Larry                                 *************************
                                      *                       *
                                      *  Speaking for myself  *
                                      *                       *
                                      *************************


From Unknown Fri Dec 08 19:17:20 1995
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From: Brian Webb <[e-mail]>
Newsgroups: de.comm.ham,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew,rec.radio.amateur.misc,sci.electronics
Subject: Serial-to-Parallel Converter
Date: 6 Dec 1995 05:01:45 GMT
Organization: Umbra Research
Lines: 10
Message-ID: <4a383p$a74$[e-mail]>
Xref: news.epix.net de.comm.ham:2488 rec.radio.amateur.digital.misc:12971 rec.radio.amateur.homebrew:11913 rec.radio.amateur.misc:95193 sci.electronics:161437

I'm trying to find either an IC or a schematic for converting
serial-parallel.

I own a solid state radioteletype decoder (circa 1980) designed
to work with serial printers. However, my printer, like virtually
all others is parallel.

Regards,

Brian Webb, KD6NRP


From Unknown Fri Dec 08 19:17:21 1995
Newsgroups: sci.electronics,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc,de.comm.ham
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!EU.net!sun4nl!rnzll3!sys3.pe1chl!rob
From: [e-mail] (Rob Janssen)
Subject: Re: Serial-to-Parallel Converter
Reply-To: [e-mail]
Organization: PE1CHL
Message-ID: <[e-mail]>
References: <4a383p$a74$[e-mail]> <[e-mail]>
Date: Thu, 7 Dec 1995 11:35:56 GMT
Lines: 19
Xref: news.epix.net sci.electronics:161511 rec.radio.amateur.misc:95217 rec.radio.amateur.homebrew:11931 rec.radio.amateur.digital.misc:12976 de.comm.ham:2494

In <[e-mail]> Don Rotolo <[e-mail]> writes:


>In article <4a383p$a74$[e-mail]>,
>> I'm trying to find either an IC or a schematic for converting
>> serial-parallel.

>Brian,
>Don't bother building one when you can buy one - about $90 from
>Global Computer Supplies 800-845-6225.

Is this today's way of dealing with homebrewers?  I'm baffled...

Rob
--
+------------------------------------+--------------------------------------+
| Rob Janssen         [e-mail] | BBS: [phone] (2300-0730 local) |
| AMPRnet:       [e-mail] | AX.25 BBS: PE1CHL@PI8WNO.#UTR.NLD.EU |
+------------------------------------+--------------------------------------+


From Unknown Fri Dec 08 19:17:22 1995
Lines: 17
Newsgroups: de.comm.ham,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew,rec.radio.amateur.misc,sci.electronics
Message-ID: <[e-mail]>
From: [e-mail] (Guenter Koellner)
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!blackbush.xlink.net!uni-erlangen.de!irz401!news1.urz.tu-dresden.de!news.dfn.de!news.uni-bielefeld.de!linteuto.teuto.de!news2.gtn.com!news.gtn.com!gtnduss1.du.gtn.com!ius.gun.de!roka.net!news.space.net!news.ecrc.de!news.mch.sni.de!news.sbs.de!news.erl.sbs.de!news!KOELLNER
Subject: Re: Serial-to-Parallel Converter
Date: Thu, 07 Dec 1995 07:26:06 +0000
References: <4a383p$a74$[e-mail]>
X-Gateway: ZCONNECT XX ius.gun.de [UNIX/Connect v0.73]
MIME-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 8bit
Xref: news.epix.net de.comm.ham:2497 rec.radio.amateur.digital.misc:12981 rec.radio.amateur.homebrew:11943 rec.radio.amateur.misc:95237 sci.electronics:161530

hello brian,

the harris HD6402 is what you need. Its easier to use than the
common AY devices. Baudrate is externally generated. The IC is
a serial/parallel converter and vice versa. Baudrates are up to
100kBaud. I use it to serialize the AD converter output of my meteosat
converter.

Try http://www.semi.harris.com to get a datasheet. The fax infothek
really works wordwide!

If you have futher questions drop me a note!

vy 73, Guenter, DL4MEA@DB0KCP.#BAY.DEU.EU   (AX.25)
                [e-mail]             (Internet)
                HTTP://WWW.SCN.DE/~KOELLNER (WWW)
                UO-22, KO-23 & KO-25        (Pacsats)


From Unknown Fri Dec 08 19:17:23 1995
Path: news.epix.net!news.sprintlink.net!chaos.aoc.nrao.edu!newshost.nmt.edu!baervan.nmt.edu!tesuque.cs.sandia.gov!ferrari.mst6.lanl.gov!nntp-server.caltech.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!news.nic.surfnet.nl!sun4nl!xs4all!falstaff
From: [e-mail] (Falstaff)
Newsgroups: de.comm.ham,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew,rec.radio.amateur.misc,sci.electronics
Subject: Re: Serial-to-Parallel Converter
Date: 7 Dec 1995 22:15:16 GMT
Organization: XS4ALL, networking for the masses
Lines: 23
Message-ID: <4a7p1k$[e-mail]>
References: <4a383p$a74$[e-mail]>
NNTP-Posting-Host: xs1.xs4all.nl
X-Newsreader: NN version 6.5.0 #666 (NOV)
Xref: news.epix.net de.comm.ham:2499 rec.radio.amateur.digital.misc:12986 rec.radio.amateur.homebrew:11953 rec.radio.amateur.misc:95250 sci.electronics:161573

Brian Webb <[e-mail]> writes:

>I'm trying to find either an IC or a schematic for converting
>serial-parallel.

>I own a solid state radioteletype decoder (circa 1980) designed
>to work with serial printers. However, my printer, like virtually
>all others is parallel.

Practically none of the 'non CPU' UART chips that were so common in the 70s
and early 80s are available anymore.  You can get the same results with
many microcontrollers now, but that requires investment in tools and
programming hardware.

The easiest would be to buy a ready-made RS232 to centronics converter,
the way most favoured with the sci.electronics group would have to
be using a microcontroller.  Cheap too if you're not counting the hours.

Frank
--
"Mutual respect, even if we disagree."
------------------------------------------------------------------------
Frank A. Vorstenbosch        [phone]        [e-mail]


From Unknown Fri Dec 08 19:17:24 1995
Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!mayonews.mayo.edu!newsdist.tc.umn.edu!umn.edu!spool.mu.edu!daily-planet.execpc.com!homer.alpha.net!uwm.edu!newsspool.doit.wisc.edu!night.primate.wisc.edu!sdd.hp.com!swrinde!howland.reston.ans.net!psinntp!psinntp!psinntp!psinntp!news.netvision.net.il!usenet
From: [e-mail] (Tsachy Lindenbaum)
Newsgroups: rec.radio.amateur.homebrew
Subject: Source for chip-capacitors (mail order)
Date: 6 Dec 1995 21:51:26 GMT
Organization: Your Organization
Lines: 12
Message-ID: <4a538u$[e-mail]>
NNTP-Posting-Host: ts9cp12.netvision.net.il
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.7

Hi
I'm looking for chip-capacitors in the 200-1000 Pf
value. I want to order by mail to ISRAEL.
Any ideas ?
Tks in advance de Isaac, 4Z4TL
--
Good bye from:
Tsachy Lindenbaum, P.O.B 21224 Tel-Aviv 62195, Israel
                   <[e-mail]>
                   4Z4TL @ 4Z4AAA.ISR.MDLE
                   972-9-582959



From Unknown Fri Dec 08 19:17:25 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!nntp.coast.net!harbinger.cc.monash.edu.au!news.rmit.EDU.AU!goanna.cs.rmit.EDU.AU!core.apana.org.au!usenet
From: [e-mail] (P Dettmann)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: Re: Source of silver plated wire ?
Date: Tue, 05 Dec 1995 21:34:47 GMT
Organization: Australian Public Access Network Association
Lines: 9
Message-ID: <4a2ah6$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: suburbia.apana.org.au
X-Newsreader: Forte Free Agent 1.0.82
Xref: news.epix.net rec.radio.amateur.antenna:17476 rec.radio.amateur.homebrew:11882

[e-mail] (Wassell, James T.,  Ph.D.) wrote:
>use silver plated no. 10 or no. 8 wire.  Does anyone know where to buy

        I find easiest is to get the wire and take it to silver platers (see
in phone book)

                                        Peter Dettmann




From Unknown Fri Dec 08 19:17:26 1995
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!utnut!hone!informer1.cis.McMaster.CA!PC-Hudak1-J.imr.McMaster.CA!hudakjm
From: [e-mail] (John Hudak)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: Re: Source of silver plated wire ?
Date: Wed, 6 Dec 1995 11:04:59
Organization: Institute for Materials Research
Lines: 5
Message-ID: <[e-mail]>
References: <[e-mail]> <4a2ah6$[e-mail]>
NNTP-Posting-Host: pc-hudak1-j.imr.mcmaster.ca
X-Newsreader: Trumpet for Windows [Version 1.0 Rev A]
Xref: news.epix.net rec.radio.amateur.antenna:17505 rec.radio.amateur.homebrew:11930

Wire with teflon insulation is silver plated.  Apparently they can't put the
teflon directly on to the copper without silver plating it first.





From Unknown Fri Dec 08 19:17:27 1995
Path: news.epix.net!news.sprintlink.net!oronet!news
From: [e-mail] (Jim Weir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Sugarloaf Brewfest
Date: Wed, 06 Dec 1995 21:19:21 GMT
Organization: RST Engineering
Lines: 24
Message-ID: <4a51bf$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: rst-engr.oro.net
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Chip Carey) wrote:

>Sugarloaf's annual brewfest is this Saturday Dec 9 features 8 of Maine's
>micro's.  There will be live music and dancing plus some great sampling.
>Call 207-237-2000 for more info.

>by the way the skiing is fantastic snowfields are already open.

>C2

Do you all suspect this spammer doesn't have a clue what
rec.radio.amateur.homebrew is all about?

Jim




Jim Weir VP Engineering  | "We seem to be standing on
RST Engineering          |  the foreskin of technology."
Grass Valley CA 95945    | (Gen Chuck Yeager)
voice/fax [phone]   |
[e-mail]  AR Adv WB6BHI  CFI A&G/Comml Inst A&G/A&P/C-182A N73CQ



From Unknown Fri Dec 08 19:17:27 1995
Path: news.epix.net!news.sprintlink.net!news.aaped.com!news.sprintlink.net!cs.utexas.edu!atlantis.utmb.edu!news.tamu.edu!news.utdallas.edu!news.starnet.net!wupost!news.dra.com!news.id.net!news.cic.net!chi-news.cic.net!brutus.bright.net!usenet.eel.ufl.edu!news.ultranet.com!skier.sugarloaf.com!chip
From: [e-mail] (Chip Carey)
Newsgroups: rec.radio.amateur.homebrew
Subject: Sugarloaf Brewfest
Date: Wed, 6 Dec 1995 00:56:42
Organization: UltraNet Communications, Inc.
Lines: 7
Message-ID: <[e-mail]>
NNTP-Posting-Host: 199.232.59.26
X-Newsreader: Trumpet for Windows [Version 1.0 Rev A]

Sugarloaf's annual brewfest is this Saturday Dec 9 features 8 of Maine's
micro's.  There will be live music and dancing plus some great sampling.
Call 207-237-2000 for more info.

by the way the skiing is fantastic snowfields are already open.

C2


From Unknown Fri Dec 08 19:17:28 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (TANTONR)
Newsgroups: rec.radio.amateur.homebrew
Subject: SURPLUS EQUIPT on WWW!
Date: 7 Dec 1995 09:40:00 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 12
Sender: [e-mail]
Message-ID: <4a6uc0$[e-mail]>
Reply-To: [e-mail] (TANTONR)
NNTP-Posting-Host: newsbf02.mail.aol.com

check this out- Surplus gear on the internet!

W. J Ford Surplus Enterprises
Smiths Falls, Ontario CANADA
(1hr north of NY state border- or FN14 for the grid-challenged :^)

http://infoweb.magi.com/~testequi/

Neat!
I have no connetion with this company whatsoever.

VE3IEY


From Unknown Fri Dec 08 19:17:29 1995
Path: news.epix.net!news.sprintlink.net!news.bluesky.net!solaris.cc.vt.edu!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Kelvin Mims )
Newsgroups: rec.radio.amateur.homebrew,rec.radio.swap,rec.radio.scanner
Subject: Re: TRADE UP TO 42MB OF RAM FOR ?? VHF/UHF EQ
Date: 3 Dec 1995 05:53:15 GMT
Organization: Netcom
Lines: 7
Message-ID: <49re0b$[e-mail]>
References: <49rbk0$32l$[e-mail]>
NNTP-Posting-Host: ix-sf9-10.ix.netcom.com
X-NETCOM-Date: Sat Dec 02  9:53:15 PM PST 1995
Xref: news.epix.net rec.radio.amateur.homebrew:11841 rec.radio.swap:52186 rec.radio.scanner:41423

THATS ALL THE MEMORY I OWN AND ITS MOSTLY 72PIN 70NS OR FASTER. I WILL
CONSIDER ANY AND ALL TRADES FOR CLEAN AND WORKING
EQUIPMENT.(2M,440,220,SCANNERS,ECT...)

KELVIN

KE6CRK


From Unknown Fri Dec 08 19:17:30 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!prodigy.com!usenet
From: [e-mail] (Rod Lane)
Newsgroups: rec.radio.amateur.homebrew
Subject: VHF Engineering Kits
Date: 5 Dec 1995 01:01:00 GMT
Organization: Prodigy Services Company  1-800-PRODIGY
Lines: 9
Distribution: world
Message-ID: <4a05kc$[e-mail]>
NNTP-Posting-Host: inugap6.news.prodigy.com
X-Newsreader: Version 1.2

Does anyone have schematics and parts lists for the old VHF Engineering
TX-144 transmitter strips?   I have one of these in repeater service and
I need to work on it.   It's been a great unit.  I don't want to replace
it.

Thanks!

E-mail [e-mail] or [e-mail]



From Unknown Fri Dec 08 19:17:31 1995
Path: news.epix.net!news.sprintlink.net!dns.crocker.com!wizard.pn.com!brighton.openmarket.com!decwrl!pagesat.net!cyberstation!usenet
From: [e-mail] (Don Young)
Newsgroups: rec.radio.amateur.homebrew
Subject: VHF Intermod filter
Date: Mon, 04 Dec 1995 21:16:16 GMT
Organization: CyberStation, Inc
Lines: 17
Message-ID: <49vou0$[e-mail]>
NNTP-Posting-Host: dony.cyberstation.net
X-Newsreader: Forte Free Agent 1.0.82

I am suffering from VHF intermod problems.

I've seen intermod filters advertised in various magazines, but I
don't wish to purchase one.  I am interested in building my own.

Any info would be helpful.

First is it possible to build this filter so that it is in line during
transmit?  My rig puts out 50 watts.

At the moment I'm only interested in 144 to 148 Mhz.

Any help Info or guidance would be greatly appreciated.

Don Young     KA2IMX
[e-mail]



From Unknown Fri Dec 08 19:17:32 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!zombie.ncsc.mil!cs.umd.edu!newsfeed.gsfc.nasa.gov!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: VLF detector?
Date: 6 Dec 1995 13:55:37 GMT
Organization: NASA Goddard Space Flight Center -- Greenbelt, Maryland USA
Lines: 16
Message-ID: <4a47cp$[e-mail]>
NNTP-Posting-Host: bailey.wff.nasa.gov
X-Newsreader: AIR News 3.X (SPRY, Inc.)

Hello...I am trying my hand at building a VLF (5 Khz) RF detector.
Because of the extremely long wavelength, an LC resonant circuit
takes LARGE values of either L or C.  Does anyone have any suggestions?
Is there an easier way to do this?  Might there be an amateur book on
the subject?

Thanks, Steve

=============================================================
Steven A. Bailey                Observational Science Branch
[e-mail]        NASA
[phone]                  Bldg. N-159, Rm. E-120
[phone] (Fax)            Wallops, VA  23337





From Unknown Fri Dec 08 19:17:32 1995
Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!news.dacom.co.kr!nntp.coast.net!torn!newshost.uwo.ca!usenet
From: Rick Gerson <rgerson>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: VLF detector?
Date: 7 Dec 1995 19:49:12 GMT
Organization: The University of Western Ontario, London, Ont. Canada
Lines: 4
Message-ID: <4a7gfo$[e-mail]>
References: <4a47cp$[e-mail]>
NNTP-Posting-Host: oort.irus.rri.uwo.ca
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (X11; I; SunOS 4.1.1 sun4c)
X-URL: news:4a47cp$[e-mail]

I am interested in this, so if you have found any inf, please let me know--
I have not the faintest idea where to start.
rick.



From Unknown Fri Dec 08 19:17:33 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!EU.net!Germany.EU.net!news.dfn.de!news.belwue.de!news.uni-stuttgart.de!moritz
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Voice via Light?
Date: 5 Dec 1995 10:50:17 GMT
Organization: Comp.Center (RUS), U of Stuttgart, FRG
Lines: 5
Message-ID: <4a1859$[e-mail]>
References: <49l0a6$[e-mail]>
NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de

>  o Use multiple LEDs mounted side by side for more power.

OK, but remember that you have to increase the number of LED's
by four to double the range.



From Unknown Fri Dec 08 19:17:34 1995
Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!rfarmer.mindspring.com!rfarmer
From: [e-mail] (Rick Farmer)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Voice via Light?
Date: Tue, 5 Dec 1995 22:15:48 -0400
Organization: MindSpring Enterprises, Inc.
Lines: 6
Message-ID: <[e-mail]>
References: <49l0a6$[e-mail]> <49r07e$[e-mail]>
NNTP-Posting-Host: rfarmer.mindspring.com
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B]

 This one screams out for a laser diode IMHO. They're actually getting petty
cheap too. ~$30US out of digi-key ought to do it. Of course lasers systems
have their saftey problems if not designed right, but you'll get great range!
Rick Farmer             |  Ratio DesignLab
Electrical Engineer     |  3040 Peachtree Rd.
[e-mail]          |  Atlanta, Ga. 30305 USA


From Unknown Fri Dec 08 19:17:35 1995
Path: news.epix.net!news.sprintlink.net!oronet!news
From: [e-mail] (Jim Weir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Voice via Light?
Date: Wed, 06 Dec 1995 16:38:29 GMT
Organization: RST Engineering
Lines: 35
Message-ID: <4a4gsn$[e-mail]>
References: <49l0a6$[e-mail]> <[e-mail]>
NNTP-Posting-Host: rst-engr.oro.net
X-Newsreader: Forte Free Agent 1.0.82

Jay Wicklund <[e-mail]> wrote:


>I built some units about 15 years ago that did just that, using IR
>leds.  You can use a simple VCO like the NE566, and use your audio
>to modulate it. As I remember it, I used a freq. of 455KHz, built a
>simple receiver using 455KHz IF transformers and a standard FM demod
>chip from Motorola.

I like the idea of using a 455 kHz. carrier on the light, so I'll
complicate up the situation and ask for your considered opinion.

You have four kids, each sitting in a separate corner of the room.
Each of the kids needs to be able to talk to each of the other kids
either directly or through a "box" sitting in the center of the room.
You can't use the same frequency for each of the kids or you will get
capture effect on the strongest signal and/or heterodyning between the
slight difference in the vco center frequencies.  Yet you can only get
cheap parts for 455 and a few kHz on either side, hardly enough
separation to put everybody on their own channel.  Time share?
First-talk inhibitor on the rest of the receivers?  The mind boggles
with the possibilities.

Your thoughts would be appreciated.

Jim



Jim Weir VP Engineering  | "We seem to be standing on
RST Engineering          |  the foreskin of technology."
Grass Valley CA 95945    | (Gen Chuck Yeager)
voice/fax [phone]   |
[e-mail]  AR Adv WB6BHI  CFI A&G/Comml Inst A&G/A&P/C-182A N73CQ



From Unknown Fri Dec 08 19:17:36 1995
Path: news.epix.net!news.sprintlink.net!clue.callamer.com!biggulp.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Voice via Light?
Date: Wed, 6 Dec 1995 16:22:13 -0800
Organization: CallAmerica, San Luis Obispo CA USA
Lines: 7
Message-ID: <[e-mail]>
References: <49l0a6$[e-mail]> <[e-mail]> <4a4gsn$[e-mail]>
NNTP-Posting-Host: biggulp.callamer.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
NNTP-Posting-User: cbuttsch
In-Reply-To: <4a4gsn$[e-mail]>

There have been three requests for simple IR communicators in the last
few weeks.  I wanted to reply with what I saw in SOME magazine in the
last six months, in which a subcarrier of 40 KHz was used.  Further, the
article proported to use easily available Radio Shack parts.  The reason
this has become so hard to find is that is was part of some monthly
column such as Hints and Kinks.  Has anyone a better memory than I to
reference this to the original requestors and me?  Cliff Buttschardt W6HDO


From Unknown Fri Dec 08 19:17:37 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!uwm.edu!homer.alpha.net!news.jersey.net!ns2.mainstreet.net!bug.rahul.net!a2i!rahul.net!a2i!news.clark.net!starport!brian.carling
Distribution: world
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Brian Carling)
References: <[e-mail]>
Date: Thu, 07 Dec 1995 07:06:00 -0500
Organization: =ACE= ONLINE [phone]
Subject: Re: Voice via Light?
Message-ID: <[e-mail]>
Lines: 17

And of course there is always the kit sold by Ramsey Electronics.
See MEGALIST.TXT for their address & get a catalog if you are
interested.

RF>dspring.com>
RF>Newsgroups: rec.radio.amateur.homebrew
RF>Organization: MindSpring Enterprises, Inc.

RF> This one screams out for a laser diode IMHO. They're actually getting petty
RF>cheap too. ~$30US out of digi-key ought to do it. Of course lasers systems
RF>have their saftey problems if not designed right, but you'll get great range
RF>Rick Farmer             |  Ratio DesignLab
RF>Electrical Engineer     |  3040 Peachtree Rd.
RF>[e-mail]          |  Atlanta, Ga. 30305 USA
---
 ■ SLMR 2.1a ■ O give me a home, where the antelope used to roam.



From Unknown Fri Dec 08 19:17:38 1995
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!news.kei.com!nntp.coast.net!chi-news.cic.net!uwm.edu!cs.utexas.edu!howland.reston.ans.net!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Muenzler, Kevin)
Newsgroups: rec.radio.amateur.homebrew
Subject: Voice via Light?
Date: 7 Dec 95 14:41:00 GMT
Organization: ucsd usenet gateway
Lines: 18
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]


 Clifford Buttschardt <[e-mail]> WRITES:

 -There have been three requests for simple IR communicators in the last
 -few weeks.  I wanted to reply with what I saw in SOME magazine in the
 -last six months, in which a subcarrier of 40 KHz was used.  Further, the
 -article proported to use easily available Radio Shack parts.  The reason
 -this has become so hard to find is that is was part of some monthly
 -column such as Hints and Kinks.  Has anyone a better memory than I to
 -reference this to the original requestors and me?  Cliff Buttschardt W6HDO

Forest Mimms, III has written several books using LEDs that include
both AM and PWFM projects to transmit voice, or whatever, using
light.  Radio Shack carries a couple of these books.  One of them
is called something like "Optielectronic Projects".

Kevin, WB5RUE
[e-mail]


From Unknown Fri Dec 08 19:17:40 1995
Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!rfarmer.mindspring.com!rfarmer
From: [e-mail] (Rick Farmer)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Voice via Light?
Date: Thu, 7 Dec 1995 21:51:18 -0400
Organization: MindSpring Enterprises, Inc.
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In article <[e-mail]> [e-mail] (Clifton T. Sharp) writes:
>From: [e-mail] (Clifton T. Sharp)
>2. Use junkbox LEDs and tweak obsessively until linearity is achieved.

>3. Build ten times as much circuitry and go digital.

 Uh, Cliff you ever heard of a microcontroller? I buy Motorola 68HC05J1s for
$1.60 and MicroChip PIC16c54s for $2.30 in low volume. Either one would be a
single chip solution to this problem. Programming kits for each go for $100
(assuming you don't already have a $500 multipurpose programmer). Never heard
of an '05, well Moto just sold it's BILLIONTH (yes 1,000,000,000) '05. There
are more processor on the planet than people, by an order of magnitude.
Rick Farmer             |  Ratio DesignLab
Electrical Engineer     |  3040 Peachtree Rd.
[e-mail]          |  Atlanta, Ga. 30305 USA


From Unknown Fri Dec 08 19:17:42 1995
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From: Jay Wicklund <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Voice via Light?
Date: Thu, 07 Dec 95 08:24:45 PDT
Organization: Northwest Nexus Inc.
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Message-ID: <[e-mail]>
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> I like the idea of using a 455 kHz. carrier on the light, so I'll
> complicate up the situation and ask for your considered opinion.
>
> You have four kids, each sitting in a separate corner of the room.
> Each of the kids needs to be able to talk to each of the other
> kids either directly or through a "box" sitting in the center of
> the room.
> You can't use the same frequency for each of the kids or you will
> get capture effect on the strongest signal and/or heterodyning
> between the slight difference in the vco center frequencies.  Yet
> you can only get cheap parts for 455 and a few kHz on either side,
> hardly enough separation to put everybody on their own channel.
> Time share?
> First-talk inhibitor on the rest of the receivers?  The mind
> boggles with the possibilities.
>
> Your thoughts would be appreciated.
>
> Jim
>

Interesting problem, I didn't remember the original posting. But the
simplest solution is to treat the channel like a 2M simplex channel.
Everyone hears everyone else, and they learn to talk one at a time.

If that is too simple, maybe PL tone squelching could be added.  Add
a sub-audible tone to the transmitter.  If a different tone is used
for each kid, the person transmitting selects the tone for the
person that he wants to talk to.  To prevent capture effect from
someone else transmitting at the same time, each transmitter could
be inhibited when the receiver sees a signal (other than its own).

It might also be possible to pull the frequency of the if
transformers enough to create two channels, and build a repeater in
the center of the room.  Everyone transmits on one channel (maybe
430KHz), the repeater retransmits on the second channel (maybe
465KHz) for everyones receiver.

Last thought (today at least)... Just looking through the newest
Ramsey catalog (just came yesterday), and they have a simple IR
voice link kit.  I think that it is an AM system using 30KHz
carrier.  I haven't had much experience with Ramsey kits.  THey
don't look like Heathkits, (look cheaper - and the one kit that I
did see had somewhat confusing instructions), but should be
workable.

I'll give it some more thought, and maybe see what some of the
others on the group come up with......

73.....KI7RH (Jay)



From Unknown Fri Dec 08 19:17:44 1995
Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!usenet
From: [e-mail] (Pieter Ibelings)
Newsgroups: rec.radio.amateur.homebrew
Subject: What's at 1420 MHz????
Date: 8 Dec 1995 00:40:46 GMT
Organization: -.-. --.-     -.. -..-
Lines: 9
Message-ID: <4a81ie$[e-mail]>
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I got my copy of Feed Point yesterday and there is a list of noise figure
results. One of the frequencies where tests were conducted is 1420 MHz.
Why 1420 MHz? Also has anyone heard of a NASA beacon that was left at the
moon around 2.4 GHz?

73's
Pieter Ibelings
AC4OP



From Unknown Fri Dec 08 19:17:45 1995
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From: "Charles W. Doolittle-Scovish" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: What's at 1420 MHz????
Date: 8 Dec 1995 05:47:25 GMT
Organization: Rensselaer Polytechnic Institute, Troy NY
Lines: 7
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1420 MHZ   =  first harmonic of water.    Microwaves operate near there.
--
Charles W. Doolittle-Scovish
[e-mail]   [e-mail]
N1SPX
Frequencies at http://acm.rpi.edu/~n1spx



From Unknown Fri Dec 08 19:17:45 1995
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From: [e-mail] (Lrware)
Newsgroups: rec.radio.amateur.homebrew
Subject: WTB: 60 Khz X-tals
Date: 3 Dec 1995 12:14:37 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 2
Sender: [e-mail]
Message-ID: <49sltt$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail] (Lrware)
NNTP-Posting-Host: newsbf02.mail.aol.com

WTB: 60Khz x-tals any mount/package, need two or three...
e-mail [e-mail]


From Unknown Fri Dec 08 19:17:47 1995
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From: [e-mail] (Booth, Thomas G)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WWVB Receiver?
Followup-To: rec.radio.amateur.homebrew
Date: 4 Dec 1995 17:26:44 GMT
Organization: A Turbulent One
Lines: 41
Distribution: usa
Message-ID: <thomas.g.booth-041295092822@160.205.101.24>
References: <495una$[e-mail]> <49j12i$[e-mail]>
NNTP-Posting-Host: 160.205.101.24

In article <49j12i$[e-mail]>, [e-mail]
(Robert L. Nuckolls, III) wrote:
>
> Jeff,
>
> Have you considered using television network burst processed for an
> accurate source.  Any time your local t.v. station is broadcasting
> network feeds, their 3.57954545 signal is good out to upteen decimal
> places.  About 10 years ago I phase locked a crystal oscillator to the
> crystal of a small solid state color receiver on the bench. Divide by
> 88 and multiply by 63 and you've got 5.000000000 Mhz.  Turns out our
> local NBC affiliate kept the station locked to network black-burst
> even while they were originating locally . . . made for a rather
> simple way to get lots of zeros behind the integers . . .
>
> Regards,
>
>   Bob, K0DYH

Bob, what you were able to do back in the mid-'80s may not be possible
today...a lot of (if not most) broadcast stations resync everything to
their local master oscillator, which may not be a rubidium oscillator
and/or may not be held to the old network frequency tolerances (but are
within FCC Part 73 tolerances).  I've observed consistent differences of
several parts in 10E-7 between the burst signals broadcast by the network
affiliates in my area, and I suspect this is true elsewhere.  Without
detailed info on a given station's engineering practice, I'm not sure you
can count on a standard derived from TV color burst being much better than
what you could get from WWV or WWVH derived standards.

FWIW to Jeff, I'm on the verge of building the WWVB receiver and comparator
from
the 73 magazine articles.  I'm holding off on the ovenized oscillator
portion, as I do have an old GR1115B crystal frequency standard which I
plan to use instead.  If you're looking for general info on WWVB, you can
look for a copy of NIST Special Publication 432 (Revised 1990) which you
ought to be able to obtain from your local GPO bookstore.

TGB

\\ The opinions expressed herein are my own. //


From Unknown Fri Dec 08 19:17:48 1995
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From: [e-mail] (John Lundgren)
Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew,sci.electronics
Subject: Xtal question:  How far can one be shifted?
Followup-To: sci.electronics.components,rec.radio.amateur.homebrew,sci.electronics,poster
Date: 7 Dec 1995 05:06:16 GMT
Organization: Delta Internet Services, Anaheim, CA
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Xref: news.epix.net sci.electronics.components:507 rec.radio.amateur.homebrew:11922 sci.electronics:161451

I need a 4864 kHz xtal, and I have one that's 4915.2 kHz.  My calculator
says that that's a difference of a little more than one percent.  I've
been filing on the case to try to get it to come apart without messing up
the rock.  I'm gonna try the old pencil lead trick on it to see what
happens (like I'm only wasting $.49 if I ruin it).  So what is the usual
or maximum amount of freq shift a good deposit of pencil lead will cause?
Any ideas?

--
#===================================================================#
|    John Lundgren - Elec Tech - Info Tech Svcs. | jlundgre@delta1  |
|       Rancho Santiago Community College        | .deltanet.com    |
|    17th St @ Bristol \ Santa Ana, CA 92706     |                  |
| My opinions are my own, and not my employer's. |                  |
|      "You can flame your brains out -- it won't take long."       |
#======P=G=P==k=e=y==a=v=a=i=l=a=b=l=e==u=p=o=n==r=e=q=u=e=s=t======#



From Unknown Fri Dec 08 19:17:49 1995
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From: Gareth Evans <[e-mail]>
Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew,sci.electronics,poster
Subject: Re: Xtal question:  How far can one be shifted?
Date: Thu, 07 Dec 95 14:01:43  GMT
Organization: None
Lines: 23
Message-ID: <[e-mail]>
References: <4a5so8$[e-mail]>
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Xref: news.epix.net sci.electronics.components:537 rec.radio.amateur.homebrew:11955 sci.electronics:161583

In article <4a5so8$[e-mail]>
   [e-mail] (John Lundgren) writes:
>I need a 4864 kHz xtal, and I have one that's 4915.2 kHz.  My calculator
>says that that's a difference of a little more than one percent.  I've
>been filing on the case to try to get it to come apart without messing up
>the rock.  I'm gonna try the old pencil lead trick on it to see what
>happens (like I'm only wasting $.49 if I ruin it).  So what is the usual
>or maximum amount of freq shift a good deposit of pencil lead will cause?
>Any ideas?


Not quite the response that you expect, but the Radio Ham Handbooks from
40 years ago describe such techniques.

Also, when using a VXCO circuit, you can usually reckon on a stable
shift of 1kHz per MHz. eg, on the 144MHz band, before the days of
the modersn synthesized approaches, you could reckon on swinging
a two-metre transmitter about 150kHz.

73 de Gareth G4SDW




From Unknown Fri Dec 08 19:17:50 1995
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From: "James P. Meyer" <[e-mail]>
Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew,sci.electronics
Subject: Re: Xtal question: How far can one be shifted?
Date: Thu, 7 Dec 1995 11:28:16 -0500
Organization: Duke University, Durham, NC, USA
Lines: 22
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References: <4a5so8$[e-mail]>
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Xref: news.epix.net sci.electronics.components:539 rec.radio.amateur.homebrew:11957 sci.electronics:161592

On 7 Dec 1995, John Lundgren wrote:

> the rock.  I'm gonna try the old pencil lead trick on it to see what
> happens (like I'm only wasting $.49 if I ruin it).  So what is the usual
> or maximum amount of freq shift a good deposit of pencil lead will cause?
> Any ideas?

        Most modern crystals have plated electrodes.  The pencil lead
trick was good for the old slabs of quartz that were held in between
copper plates with spring pressure.  You will likely break a modern thin
crystal by trying to use a pencil on it.

        If you could get ahold of sonething to do some electroplating
with, you could tie both pins together and plate a little more electrode
material thickness onto whatever's there now.  There's also some
"electroless" tin plating solutions made for pcboard fabrication that
lays down a tin plating just by dipping the stuff in it.  No batteries
needed.

Jim "no sig" Meyer




From Unknown Wed Dec 13 14:36:39 1995
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From: [e-mail] (Ps7ab)
Newsgroups: rec.radio.amateur.homebrew
Subject: #
Date: 8 Dec 95 23:20:41 GMT
Organization: PC-Image BBS =*= Natal, RN - Brazil
Lines: 16
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]


 Pse unsubscribe Ham- Homebrew Mailing List and Newsgroup.

 Mny Tnx.

 [e-mail]
 ----------


PS7AB, Rony  (PY-DX Bulletin)
[e-mail]
Natal City (05.52.S  35.10.W)
___
* UniQWK #4072*-*- SF-Quick/BW 1.00q [UNREGISTERED]

 * Sent via SFE-mail from [UNREGISTERED BBS]


From Unknown Wed Dec 13 14:36:40 1995
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From: [e-mail] (Ps7ab)
Newsgroups: rec.radio.amateur.homebrew
Subject: #
Date: 8 Dec 95 23:20:41 GMT
Organization: PC-Image BBS =*= Natal, RN - Brazil
Lines: 16
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]


 Pse unsubscribe Ham- Homebrew Mailing List and Newsgroup.

 Mny Tnx.

 [e-mail]
 ----------


PS7AB, Rony  (PY-DX Bulletin)
[e-mail]
Natal City (05.52.S  35.10.W)
___
* UniQWK #4072*-*- SF-Quick/BW 1.00q [UNREGISTERED]

 * Sent via SFE-mail from [UNREGISTERED BBS]


From Unknown Wed Dec 13 14:36:40 1995
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From: [e-mail] (Roy Boggs)
Newsgroups: rec.radio.amateur.homebrew
Subject: (no subject)
Date: 9 Dec 95 02:47:35 GMT
Organization: ucsd usenet gateway
Lines: 1
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

add ham-homebrew


From Unknown Wed Dec 13 14:36:43 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!fox.almaden.ibm.com!garlic.com!news.scruz.net!rstevew
From: [e-mail] (Richard Steven Walz)
Newsgroups: sci.electronics,rec.radio.amateur.homebrew
Subject: Re: 12VDC
Date: 12 Dec 1995 08:44:28 GMT
Organization: The Armory
Lines: 41
Message-ID: <4ajfdc$[e-mail]>
References: <4a9qhe$[e-mail]> <[e-mail]> <4aabpg$[e-mail]>
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In article <4aabpg$[e-mail]>,
Bruce Bostwick  <[e-mail]> wrote:
>[e-mail] (Steve Work) wrote:
>> Also, I do not think that 2^8 combinations is particularly un-secure.
>> Remember that the potential intruder would have to not only try all 256
>> codes but learn several other details such as frequency, encoding method,
>> etc.  All of which make their job much more difficult.  If it were me , I
>> would stick with what you know can get to work.
>
>It's worth mentioning that around here, at least, there are people who
>specialize in this type of burglary and apparently they're pretty good
>at it -- we had a special on the news not too long ago about how easy
>it was to break into houses with garage door openers.  I suspect that
>most of the job nowadays is in the form of hardware you can buy from
>people who sell shady quasi-legal stuff like this (nominally for
>educational purposes only, of course, just like 1kW CB linears etc.)
>so better not count on store-bought stuff for Fort Knox security ...
>
><BGB>  http://ccwf.cc.utexas.edu/~lihan/
------------------------------------------
For garage door openers it is pretty easy to monitor a broad band of
frequencies and grab your code out of the air. A protection for this
is to use the interior button to open and the hand transmitter with a
DIFFERENT code to close. Then have a third code on the hand
transmitter to re-open if the first code is tried again within 30
seconds of moving. For the unskilled homeowner, though, it is better to
make a door opener which has a microcontroller which detects multiple
attempts nearby to open your door, and it automatically changes the
open code to a longer code you would need to switch to with your hand
transmitter!! This also gives you warning that someone may have
attempted entry! The best is a computer that locks the system and
calls security if anyone sends a binary sequence of numbers in obvious
attempt to open yours or nearby garages! Sort of like the ATM machines
which keep your card if you fail to enter the right PIN number three times
in a row in any day or week! Don'tcha jus'luv redundancy? "PIN number"!

--
-Steve Walz   [e-mail]    ftp.armory.com/pub/user/rstevew
also mirrored at: ieee.cas.uc.edu/pub/electronics/faq/ftp.armory.com
and in Europe at: ftp.cised.unina.it/pub/electronics/ftp.armory.com



From Unknown Wed Dec 13 14:36:44 1995
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From: [e-mail]@deltanet.com
Newsgroups: sci.electronics,rec.radio.amateur.homebrew
Subject: Re: 12VDC "Secure" Receiver/Transmitter Pair
Date: 12 Dec 1995 02:02:47 GMT
Organization: Delta Internet Services, Anaheim, CA
Lines: 30
Message-ID: <4ains7$[e-mail]>
References: <4a9qhe$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ana2082.deltanet.com
X-Newsreader: IBM NewsReader/2 v1.2.5
Xref: news.epix.net sci.electronics:161990 rec.radio.amateur.homebrew:12054

In <4a9qhe$[e-mail]>, [e-mail] (Richard Scott) writes:
>
>What I'm seeking is basically a short-range DC transmitter/receiver pair
>that functions much like a garage door or gate opener (and in fact it is
>the latter for which the pair will be used) that offers a fairly-high level
>of security.  Note that 12VDC is all that's available to the receiver, as
>the gear-motor driven gate is in a remote location (powered by lead-acid
>batteries charged by solar panels).

It depends on what you mean by "secure".

If what you need is a system which has a huge number of possible codes,
there are several on the market.  One of these the "DX" wireless units made
by Linear.  Each transmitter is individually coded at the factory, and the
receiver must "learn" each code it is supposed to accept.  The basic
receiver can learn up to 16 different transmitter codes.  There are larger
systems available.  Any alarm company can get them for you, as can the
installers of electric gates.  Look for a company which advertises that they
do "access control", and they'll know what you're looking for.  By the way,
one advantage to these systems is that a lost transmitter can be programmed
out of the system without affecting the other valid transmitters.  And yes,
they run on 12VDC.

If what you need is protection against a "code-grabber", which can receive,
store, and retransmit whatever code your transmitter sends out, you'll need
a rather fancy system which transmits a different code each time you push
the button.  This is used in the high-end car alarms, since it's worth going
to this much trouble if you want to steal a Ferrari.  But it's probably overkill
for a gate application.  As far as I know, this type of system does not handle
multiple transmitters.


From Unknown Wed Dec 13 14:36:45 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!howland.reston.ans.net!torn!nott!cunews!freenet.carleton.ca!FreeNet.Carleton.CA!at007
From: [e-mail] (Dan Barnawell)
Subject: 2 METER/220 BASE ANTENNA?????
Message-ID: <[e-mail]>
Sender: [e-mail] (Dan Barnawell)
Organization: The National Capital FreeNet, Ottawa, Ontario, Canada
Date: Sat, 9 Dec 1995 18:06:33 GMT
Lines: 9

I am wanting to build an antenna for use with a Standard C228A
2 meter and 220 ht. I want to put this in a tree 80 feet high.
What I was thinking was to make 2 whips 1/4 wave and attach each
whip to a single so239 connector. Any ideas of maybe a simple
design that might have a little gain also? Needs to be fairly small
and simple.

                                        Thanks for your ideas,
                                                  Dan Barnawell (N4YSV)


From Unknown Wed Dec 13 14:36:46 1995
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!usenet.hana.nm.kr!usenet.seri.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!swidir.switch.ch!in2p3.fr!univ-lyon1.fr!elendir
From: [e-mail] (Elendir)
Newsgroups: rec.radio.amateur.homebrew
Subject: 23 cm cavities
Date: 8 Dec 1995 10:47:32 GMT
Organization: ENST - Telecom Paris
Lines: 28
Message-ID: <4a9544$[e-mail]>
NNTP-Posting-Host: julia.enst.fr
X-Newsreader: TIN [version 1.2 PL2]

Hi,
yet another question :-)

This time, I got a question about the design of a 23 cm (1291 MHz)
cavity. It is supposed to be used for a repeater to be installed in Paris.
It would be part of the duplexer.
I planned to obtain -120 dB at 1297 while maintening -3 dB at 1291
(insertion loss).
I just wonder if anyone has already done this kind of design. If yes :

- What are the size of the cavity (assuming it is a cylinder)
- What is the material (Brass, silvered brass, copper).
- How is it coupled to the antenna
- What is the Q
- How is the tuning system
- How much did it cost !

I just figured out that for a TE111 mode cavity, a diameter of 136 mm
was a minimum. Made in copper, it yielded Q~30000.
What about coaxial cavity ? It seems more compact but much less
selective.

Thanks for any info !

And 73s again - Vincent
--
F5RCS - Worldwide Friendship through Amateur Radio
ENST, Ecole Nationale Superieure des Telecommunications, Paris


From Unknown Wed Dec 13 14:36:47 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.mel.aone.net.au!OzEmail!usenet
From: Bruce Miller <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: ANY INFO ON DRAKE TR7?
Date: 10 Dec 1995 11:34:15 GMT
Organization: OzEmail Pty Ltd - Australia
Lines: 6
Message-ID: <4aegjn$[e-mail]>
NNTP-Posting-Host: slhob1p08.ozemail.com.au
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Macintosh; I; 68K)
X-URL: news:rec.radio.amateur.homebrew

Hi there, does anyone have any info on servicing a DRAKE TR7, or general
thoughts on the matter for a poor shambling broken down QLd Australia
ham, who is my father in law...he would be happy to swap info ,
transistor data etc & talk on air.




From Unknown Wed Dec 13 14:36:48 1995
Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!newsfeed.internetmci.com!in1.uu.net!csn!nntp-xfer-2.csn.net!symbios.com!southwind.net!usenet
From: [e-mail] (Robert L. Nuckolls, III)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ANY INFO ON DRAKE TR7?
Date: Sun, 10 Dec 1995 15:59:54 GMT
Organization: AeroElectric Connection
Lines: 21
Message-ID: <4af05v$[e-mail]>
References: <4aegjn$[e-mail]>
NNTP-Posting-Host: ict25.southwind.net
X-Newsreader: Forte Free Agent 1.0.82

Bruce Miller <[e-mail]> wrote:

>Hi there, does anyone have any info on servicing a DRAKE TR7, or general
>thoughts on the matter for a poor shambling broken down QLd Australia
>ham, who is my father in law...he would be happy to swap info ,
>transistor data etc & talk on air.


Bruce,

I someone doesn't come forward with a better deal, somewhere in my
archives, I have the name and address of an entreprenure who has
collected a very broad range of data books and manuals on the old ham
gear.  He ain't cheap but I've used his services on many occasions in
past years when there just wasn't any other way. Drop me an email if
you need the address.

Bob  . . .
K0DYH  [e-mail]




From Unknown Wed Dec 13 14:36:50 1995
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usenet
From: Wes Stewart <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ANY INFO ON DRAKE TR7?
Date: 11 Dec 1995 01:20:45 GMT
Organization: Arizona Daily Star - AZSTARNET
Lines: 13
Message-ID: <4ag11d$[e-mail]>
References: <4aegjn$[e-mail]>
NNTP-Posting-Host: usr7ip45.azstarnet.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)
To: [e-mail]

Bruce Miller <[e-mail]> wrote:
>Hi there, does anyone have any info on servicing a DRAKE TR7, or general
>thoughts on the matter for a poor shambling broken down QLd Australia
>ham, who is my father in law...he would be happy to swap info ,
>transistor data etc & talk on air.


I have a TR7 and a complete service manual. What do you need to know?
With current propagation conditions and my poor HF antenna system, I
don't know about on the air, but can work this medium.

73, Wes -- N7WS



From Unknown Wed Dec 13 14:36:50 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.sesqui.net!uuneo.neosoft.com!usenet
From: [e-mail] (Don Sterner)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Any schemes or info for building a 'cellular phone range' transmitter?
Date: 12 Dec 1995 18:06:26 GMT
Organization: NeoSoft Internet Services   [phone]
Lines: 20
Message-ID: <4akgb2$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: scooter-ppp-e8.neosoft.com
X-Newsreader: WinVN 0.99.7

In article <[e-mail]>, [e-mail] says...
>
>I was wondering if it was possible to build a radiotransmitter which only
>produces a noise signal to disturb cellular phone usage indoors.
>
>If so, can anyone send me an easy to build project including a scheme
>and a components list ?
>
>It should be a low power transmitter, with a disturbance range of about
>30 by 30 foot, with no other equipment (radio, television, etc) being harmed
of
>course.
>
>Any info (also on frequencies for cellulars in Belgium (GSM)) to :
>
>[e-mail]
>

I think intentional jamming is illegal, regardless of power output.



From Unknown Wed Dec 13 14:36:51 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!uunet!in2.uu.net!usenet.eel.ufl.edu!tank.news.pipex.net!pipex!howland.reston.ans.net!ix.netcom.com!news3.noc.netcom.net!zdc!zippo!usenet
From: [e-mail] (Robert A. Lanier)
Subject: ARRL books
X-Newsreader: Forte Free Agent 1.0.82
Sender: [e-mail]
Nntp-Posting-Host: 129.228.232.106
Organization: Westinghouse Electro-Optics
Message-ID: <[e-mail]>
Date: Tue, 12 Dec 1995 20:26:19 GMT
Lines: 13

Has anyone purchased the following books:

        Introduction to Radio Frequency Design by Wes Hayward

        QRP Classics

Both are available from ARRL. I looking for a good intermediate to
advanced book on RF design, one that has practical circuits, but also
detailed theory.

Any comments are welcome.




From Unknown Wed Dec 13 14:36:52 1995
Path: news.epix.net!uunet!in2.uu.net!mozz.unh.edu!moore.sr.unh.edu!moore
From: "Andrew M. Moore" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Building 50-100W 7 MHz amp - suggestions?
Date: Tue, 12 Dec 1995 09:18:59 -0500
Organization: University of New Hampshire  -  Durham, NH
Lines: 8
Message-ID: <[e-mail]>
NNTP-Posting-Host: moore.sr.unh.edu
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII


I plan on building a 50 to 100 watt amplifier for 7 MHz CW, using from
1 to 5 watts drive.  I would like to hear people's suggestions about
the design, components, gotchas, sources of information, etc. before I
get started.

Thanks,
-Drew


From Unknown Wed Dec 13 14:36:53 1995
Path: news.epix.net!news.sprintlink.net!newsat!engineer.mrg.uswest.com!news.uoregon.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!newsfeed.internetmci.com!dimensional.com!winternet.com!amoeba
From: [e-mail] (Who wants to know?)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Building 50-100W 7 MHz amp - suggestions?
Date: 13 Dec 1995 03:09:43 GMT
Organization: StarNet Communications, Inc
Lines: 22
Message-ID: <4alg5n$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: klondike.winternet.com
X-Newsreader: TIN [version 1.2 PL2]

Andrew M. Moore ([e-mail]) wrote:

: I plan on building a 50 to 100 watt amplifier for 7 MHz CW, using from
: 1 to 5 watts drive.  I would like to hear people's suggestions about
: the design, components, gotchas, sources of information, etc. before I
: get started.

I am also very interested in this too.  I am looking to build something
similar for CW and SSB for 7 MHz.  However, I would also like to hear any
suggestions for a 6M 50 to 100W amplifier.

I too will be putting out anywhere from 1 to 5 watts drive.  I would like to
stick with a solid-state based amp vs. tubes.

Thanks and 73!
dit dit

--
 -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
  John T. Croteau - A.R.S. KA1VIX    | Ten-Tec Argo 556 and Linux
  From Beautiful Minneapolis, Minn.  |           A rather stylin QRP Station!
 -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-


From Unknown Wed Dec 13 14:36:54 1995
Newsgroups: comp.dsp,rec.radio.amateur.homebrew
Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!EU.net!sun4nl!rnzll3!sys3.pe1chl!rob
From: [e-mail] (Rob Janssen)
Subject: Re: Determine Signal to Noise with PC Soundblaster??
Reply-To: [e-mail]
Organization: PE1CHL
Message-ID: <[e-mail]>
References: <4akq0i$[e-mail]>
Date: Wed, 13 Dec 1995 11:19:42 GMT
Lines: 28
Xref: news.epix.net comp.dsp:25099 rec.radio.amateur.homebrew:12102

In <4akq0i$[e-mail]> [e-mail] (John Wagner) writes:

>I'm looking for some code snips (preferrably in C) that will evaluate S/N
>on an incoming audio signal on a Soundblaster type PC audio card.

>My local amateur radio club is planning on adding several receivers in
>different locations to our radio repeater system.  We need a system to
>determine which receiver hears a signal the best, based on the best signal
>to noise ratio.

>To me, this sounds like a job for a few Soundblaster cards.

Probably it is much simpler to do it in hardware...
Assuming you use FM, just high-pass filter the signal at a frequency
that is above the highest modulation components, e.g. 10 KHz.
There you will have only noise.  Just rectifying and comparing those
values will give you the required selection criterion.
(this is the same method that the usual SQUELCH circuit uses.  you may
be able to extract the required "rectified noise" signal from the receivers)

Of course the above can be done using DSP techniques as well.

Rob
--
+------------------------------------+--------------------------------------+
| Rob Janssen         [e-mail] | BBS: [phone] (2300-0730 local) |
| AMPRnet:       [e-mail] | AX.25 BBS: PE1CHL@PI8WNO.#UTR.NLD.EU |
+------------------------------------+--------------------------------------+


From Unknown Wed Dec 13 14:36:55 1995
Path: news.epix.net!news.sprintlink.net!psgrain!newsfeed.internetmci.com!uwm.edu!lll-winken.llnl.gov!enews.sgi.com!decwrl!purdue!yuma!lamar.ColoState.EDU!not-for-mail
From: [e-mail] (Watts)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Drilling PC boards
Date: 6 Dec 1995 14:52:59 -0700
Organization: Colorado State University, Fort Collins, CO  80523
Lines: 6
Message-ID: <4a53br$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: lamar.acns.colostate.edu
X-Newsreader: TIN [version 1.2 PL2]

I use a Dremel Moto Tool, a Dremel drill press adapter and a very fine
bit.  Like other postings on this subject, I go along with having as
* SHORT * a drill bit as possible.  I break the little things off at about
3/4 inch and have about 3/16 sticking out of the chuck.

Galen, KF0YJ


From Unknown Wed Dec 13 14:36:56 1995
Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!news.west.net!usenet
From: [e-mail] (qrk)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: FET bias
Date: Sun, 10 Dec 1995 23:12:48 GMT
Organization: Marginal
Lines: 19
Message-ID: <4afphg$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: term1-29.sb.west.net
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (wayne barnhart) wrote:

>>Siliconix has a very nice linear product brief (LPD-2) which discusses
>>the biasing of FETs and sensitivity to device characteristics.
>>
>> * Dana H. Myers KK6JQ, DoD#: j

>I don't understand this. If it is a paper on biasing where does one
>encounter it? From Siliconix. What's a Siliconix.
>I feel severly dumb...

Siliconix is a manufacturer of FET's.  Along with their reasonably
excellent data, they do have some very nice application notes in their
data books.  Most technical libraries (like at the university) have
data books.

-
Mark Chun  |  [e-mail]  |  Santa Barbara, CA



From Unknown Wed Dec 13 14:36:57 1995
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!geraldo.cc.utexas.edu!slip-47-11.ots.utexas.edu!user
From: [e-mail] (Anthony Helm)
Newsgroups: rec.radio.amateur.homebrew
Subject: FS:  Must sell communications receiver and comp. memory
Date: Sun, 10 Dec 1995 13:22:17 -0700
Organization: The University of Texas at Austin, Austin, Texas
Lines: 15
Message-ID: <[e-mail]>
NNTP-Posting-Host: slip-47-11.ots.utexas.edu

Moving in a matter of days!  I must sell the following two items:

1 (one) 4meg 72 pin SIMM.  Removed from a Macintosh 630CD when I upgraded to
            20megs.  Works fine.  Test it and see.       $90

1 (one) Realistic DX-302 Quartz Synthesized Communications Receiver with digital
            LED readout.  Tunes10 kHz to 30 MHz continuously.  Excellent
condition.
            $75

Call [phone]

Cheers,
Anthony
[e-mail]


From Unknown Wed Dec 13 14:36:58 1995
Path: news.epix.net!news.sprintlink.net!service-2.bluefin.net!usenet
From: [e-mail] (Peter LePage KD1XZ)
Newsgroups: rec.radio.amateur.homebrew
Subject: FT1000 DVS-2 Specs Wanted
Date: 11 Dec 1995 02:03:57 GMT
Organization: Blue Fin Systems, Inc.
Lines: 11
Message-ID: <4ag3id$[e-mail]>
NNTP-Posting-Host: pol.bluefin.net
X-Newsreader: WinVN NT 0.92.6

I would like to interface to the Digital Voice Recorder port of the FT-1000.
I have the pin-out of the cabling, but don't have signal levels required, etc.

Has anyone on the net successfully interfaced to the DVS-2 port?
Perhaps someone with the DVS-2 option has some insight?

Thanks,

Peter / KD1XZ




From Unknown Wed Dec 13 14:36:59 1995
Path: news.epix.net!news.sprintlink.net!news.xnet.com!gwilliam
From: [e-mail] (Gilbert Gwilliam)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Ham stores/Chicago, 500W dummy load
Followup-To: rec.radio.amateur.homebrew
Date: 12 Dec 1995 18:10:25 GMT
Organization: XNet - A Full Service Internet Provider - [phone]
Lines: 17
Message-ID: <4akgih$[e-mail]>
NNTP-Posting-Host: cyclone.xnet.com
Summary: looking for source of 500W dummy load
Keywords: Dummy load ham stores
Xref: news.epix.net rec.radio.amateur.equipment:22410 rec.radio.amateur.homebrew:12068 rec.radio.amateur.misc:95450

I am a non-ham who needs to buy a 500 W dummy load (for 13.56 MHz,
preferably with a BNC connector) for an experiment in an industrial
setting.  Needless to say, I need this soon (like tomorrow).  Can anyone
tell me a ham store in the Chicago area (North/West would be preferable
but not required) or a mail-order outfit that would be able to supply
this item quickly?  Alternatively, does anyone in the Chicago area have
one that they could lend (rent) to us for a few days?  Although it might
be possible to build a dummy load relatively simply, I would prefer not
to do that for reasons of repeatability (we may need to repeat this
experiment in another location with different equipment at a later
date.)

Any help would be appreciated.

Jeff Gwilliam




From Unknown Wed Dec 13 14:37:00 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!newsfeed.internetmci.com!vixen.cso.uiuc.edu!milo.mcs.anl.gov!usenet
From: RGF <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ham stores/Chicago, 500W dummy load
Date: Tue, 12 Dec 1995 12:47:04 -0800
Organization: ANL
Lines: 19
Message-ID: <[e-mail]>
References: <4akgih$[e-mail]>
NNTP-Posting-Host: foster.ctd.anl.gov
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b3 (Win16; I)
To: Gilbert Gwilliam <[e-mail]>

Gilbert Gwilliam wrote:
>
> I am a non-ham who needs to buy a 500 W dummy load (for 13.56 MHz,
> preferably with a BNC connector) for an experiment in an industrial
> setting.  Needless to say, I need this soon (like tomorrow).  Can anyone
> tell me a ham store in the Chicago area (North/West would be preferable
> but not required) or a mail-order outfit that would be able to supply
> this item quickly?  Alternatively, does anyone in the Chicago area have
> one that they could lend (rent) to us for a few days?  Although it might
> be possible to build a dummy load relatively simply, I would prefer not
> to do that for reasons of repeatability (we may need to repeat this
> experiment in another location with different equipment at a later
> date.)
>
> Any help would be appreciated.
>
> Jeff GwilliamTwo places come to mind: In Wheaton, the Ham Radio Toy Store, and in
the northwest side of chicago on Milwaukee Ave, Erickson's.
Hope this helps.


From Unknown Wed Dec 13 14:37:01 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!SantaFe!usenet
From: Jim Potter <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ham stores/Chicago, 500W dummy load
Date: Tue, 12 Dec 1995 19:19:35 -0700
Organization: JP Accelerator Works, Inc.
Lines: 11
Message-ID: <[e-mail]>
References: <4akgih$[e-mail]>
NNTP-Posting-Host: dial130.roadrunner.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b3 (WinNT; I)
To: Gilbert Gwilliam <[e-mail]>

Try Surplus Sales of Nebraska in Omaha.  They will have what you
want and can ship it overnight.  Sorry, I can't put a finger on
their phone number right now.

Jim

--
James M. Potter, President      E-mail: [e-mail]
JP Accelerator Works, Inc.      URL: www.jpaw.com/jpaw/
2245 47th Street                Voice: 505-662-5804
Los Alamos, NM 87544-1604       FAX: [phone]


From Unknown Wed Dec 13 14:37:02 1995
Path: news.epix.net!uunet!in2.uu.net!news.iag.net!usenet.eel.ufl.edu!tank.news.pipex.net!pipex!demon!peer-news.britain.eu.net!EU.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews
From: Jim O'Connell <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ham stores/Chicago, 500W dummy load
Date: Tue, 12 Dec 1995 15:26:14 -0800
Organization: Netcom
Lines: 23
Message-ID: <[e-mail]>
References: <4akgih$[e-mail]>
NNTP-Posting-Host: ix-chi4-15.ix.netcom.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-NETCOM-Date: Tue Dec 12  1:25:18 PM PST 1995
X-Mailer: Mozilla 2.0b3 (Win16; I)
To: Gilbert Gwilliam <[e-mail]>

Gilbert Gwilliam wrote:
>
> I am a non-ham who needs to buy a 500 W dummy load (for 13.56 MHz,
> preferably with a BNC connector) for an experiment in an industrial
> setting.  Needless to say, I need this soon (like tomorrow).  Can anyone
> tell me a ham store in the Chicago area (North/West would be preferable
> but not required) or a mail-order outfit that would be able to supply
> this item quickly?  Alternatively, does anyone in the Chicago area have
> one that they could lend (rent) to us for a few days?  Although it might
> be possible to build a dummy load relatively simply, I would prefer not
> to do that for reasons of repeatability (we may need to repeat this
> experiment in another location with different equipment at a later
> date.)
>
> Any help would be appreciated.
>
> Jeff Gwilliam

Jeff: Try Erickson Communications at 312 631-5181. They're on north
Milwaukee Ave (about Foster?). They should have a 1 kw dummy load
with an SO239 connector.

73, Jim W9WU


From Unknown Wed Dec 13 14:37:03 1995
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.uoregon.edu!news.emf.net!gatech!newsfeed.internetmci.com!in2.uu.net!interaccess!d107.w.interaccess.com!user
From: [e-mail] (Dave Moorman)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ham stores/Chicago, 500W dummy load
Date: Tue, 12 Dec 1995 20:48:39 -0600
Organization: InterAccess, Chicago's best Internet Service Provider
Lines: 11
Message-ID: <[e-mail]>
References: <4akgih$[e-mail]> <[e-mail]>
NNTP-Posting-Host: d107.w.interaccess.com

In article <[e-mail]>, RGF <[e-mail]> wrote:

>Two places come to mind: In Wheaton, the Ham Radio Toy Store, and in
> the northwest side of chicago on Milwaukee Ave, Erickson's.
> Hope this helps.

I'm not sure, but I think Erickson's is on Elston.

Dave Moorman, K9SW
Downers Grove,
Illinois


From Unknown Wed Dec 13 14:37:04 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!usenet
From: "C. J. Hawley Jr." <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ham stores/Chicago, 500W dummy load
Date: Wed, 13 Dec 1995 09:56:30 -0600
Organization: University of Illinois, Urbana-Champaign
Lines: 29
Message-ID: <[e-mail]>
References: <4akgih$[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: antwerp-3.slip.uiuc.edu
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b3 (Win95; I)

Dave Moorman wrote:
>
> In article <[e-mail]>, RGF <[e-mail]> wrote:
>
> >Two places come to mind: In Wheaton, the Ham Radio Toy Store, and in
> > the northwest side of chicago on Milwaukee Ave, Erickson's.
> > Hope this helps.
>
> I'm not sure, but I think Erickson's is on Elston.

One of those angled streets anyway. No, it's on Milwaukee. There is a
great ethnic bakery a few doors down the street where your wife and
mother in law can sit and have coffee and pastries. Beats sitting in the
car....or in the store rolling their eyes at the prices.

>
> Dave Moorman, K9SW
> Downers Grove,
> Illinois

--


Charles Jack Hawley Jr.
Amateur Radio KE9UW (A.K.A. 'Chuck' in Ham Radio)
BMW K100RS, BMWMOA #224 (A.K.A. 'Jack' in Motorcycles)
[e-mail]
Sr. Research Engineer Emeritus
Univ of Ill, Urbana-Champaign


From Unknown Wed Dec 13 14:37:05 1995
Path: news.epix.net!news.sprintlink.net!news.accessus.net!news.uoregon.edu!chi-news.cic.net!usc!math.ohio-state.edu!howland.reston.ans.net!gatech2!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Ps7Ab Rony)
Newsgroups: rec.radio.amateur.homebrew
Subject: Ham-Homebrew Digest V95 #
Date: 11 Dec 95 01:48:00 GMT
Organization: DIALDATA Systems - 011-822-8055
Lines: 5
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]


unsubscribe  [e-mail]  HAM-HOMEBREW DIGEST





From Unknown Wed Dec 13 14:37:06 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!pacifier!rainrgnews0!hevanet.com!usenet
From: "Michael G. Reiney/Myra Colter" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ham-Homebrew Digest V95 #421
Date: 10 Dec 1995 11:28:34 GMT
Organization: Hevanet Communications
Lines: 9
Message-ID: <4aeg92$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ke-ppp06.hevanet.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)

PADS-PCB has a shareware version that works well for small boards.  It's limited in
the number of parts you can have, 70 I think.  The first version was called
Padsdemo.  There is a more recent version called Testdrive.   I think Testdrive has
a better autorouter, but I've not taken the time to convert to it.  I don't know if
you can still get it from the Pads guys, but I've tripped over Padsdemo on the www.
 It comes with a nice part library....and if your invention works, you can have the
board made commercially.
miker



From Unknown Wed Dec 13 14:37:08 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!solaris.cc.vt.edu!usenet
From: [e-mail] (Mike Keitz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help Needed: Expert Hackers only (long)
Date: Sat, 09 Dec 95 07:09:25 GMT
Organization: TSE Systems
Lines: 82
Message-ID: <4abce3$[e-mail]>
References: <4a799h$[e-mail]>
NNTP-Posting-Host: mkeitz.beve.blacksburg.va.us
X-Newsreader: News Xpress Version 1.0 Beta #4

In article <4a799h$[e-mail]>,
   [e-mail] (PFZouave) wrote:
>I am in the process of developing a tiny computer controlled medical
>monitoring device. The device, only a few inches square, is intended to be
>located at the patient's chest, at the sternum, and held in place there by
>a bra-like attachment garment. The garment features a pocket or holster in
>which the monitor is placed.
>
>While the system in fact works, the practical success of the device hinges
>on the ability of the unit to detect whether or not it has been has been
>removed from the patient. I call this "tamper protection."
>To date, I have been unable come up with a tamper protection scheme that
>meets the necessary engineering criterion. The circuitry must enable the
>monitor to tell whether or not it has been removed from the patient's
>body. The added circuitry must be cheap, as simple as possible, and
>utilize a few active components as possible(the device is battery-powered,
>so power consumption is always an issue.)  It must not be easily defeated,
>and must function at varying battery voltages down to, say, 3 volts.
>Ideally, such circuitry should function properly from the moment of
>assembly, that is to say, it should not require tweaking or calibration.
>While the computer used in this project has limited analog input
>capability, the ideal tamper sensing scheme can warn of a tamper condition
>with a single binary bit.

[...]

The rest of the system presumably measures some biological phenomena (being
strapped to the chest, it could detect heart and respiratory activity
easily).  Of course if it is removed, these readings would go to zero.
Presumably the sensor is to determine if a zero reading is because the
patient's vital systems are in distress, or if the monitoring device has
just been removed.  Other uses could be to prevent/discourage theft or
misuse, or to place the monitor in a low power state when not attached to a
patient and therefore not in use.  Or there may be more sinister
application?

Kevin's idea about a motion-detecting switch is a good one.  If it's to
distinguish impending death from a false alarm, it may be too slow.

If two electrodes can be in contact with the patient, simply detecting the
resistance between them could work.  A reading of infinity means monitor is
not attached, slightly more advanced circuitry could also detect near-zero
reistance that would result from attempting to defeat the sensor with a
metal object.  Detecting the resistance could be with comparators, an
analog input, or a RC oscillator the frequency of which is counted by the
digital circuitry.

One electrode near or touching the patient could be used as a capacitive
sensor.  Most of these are base on oscillators with less than the usual
amount of feedback so they stop oscillating if a body is near the sensor
plate (which is connected at or near the input of the oscillator).  This is
easy if the sensor plate is actually in contact, the change is much more
subtle if it is only capacitively coupled.  I believe the "stud sensor"
used for locating wooden wall studs works on this principle.  But it has to
be constantly adjusted by the user.  The Israeli baby-monitor probably
works on a differential principle as well (AC-coupled amplifier to detect
small changes caused by the baby breathing or moving), so it's really a
variaton of the motion switch concept rather than an actual body detector.

>Why? Because the recovery amplifier is a linearly biased inverter! The
>bias value is tricky, so a trimpot must be included in the design. Besides
>consuming space, trimpots are unacceptable in this design because they
>require that every single unit produced be hand-calibrated.

As an aside, CMOS inverters can be biased into linear operation (with no
tricky adjustment), with simply a resistor from the output back to input.
It is a good approximation to model the inverter as an op-amp with the
non-inverting input internally tied to half the supply voltage (a very
common configuration).  The gain of the stage can be controlled by
the ratio of the feedback resistor to the input resistor or
impedance.  (For low closed-loop gains anyway.  The open-loop gain of a
single inverter is not very high.  Three inverters DC-coupled in series
have a lot of open-loop gain, but can get unstable.)  Although a 4069 draws
only about 1 mA from 5V in this configuration, silicon-gate devices
(74HC04, etc), will draw quite a bit more.  And different brands of chips
can have widely differing characteristics.  If the frequency is low,
micropower op-amps are likely to be better.

[...]

-Mike KD4QDM



From Unknown Wed Dec 13 14:37:09 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!lamarck.sura.net!fconvx.ncifcrf.gov!mack
From: [e-mail] (Joe Mack)
Subject: Re: Help on homebrew 2 meter 6 element yagi beam
Message-ID: <[e-mail]>
Organization: Frederick Cancer Research and Development Center
References: <49torm$[e-mail]>
Date: Mon, 11 Dec 1995 16:01:34 GMT
Lines: 26

In article <49torm$[e-mail]> [e-mail] (Allan Baird) writes:
>Just recently made a 2m 6 element yagi beam (two of them). The sliding
>choke or balun is giving me trouble. One has a SWR of 1.5 and the other
>1.7 .

Congratulations on getting them so low and so close the first time
>
>If we can't get SWR better, how could we redevelop a new/different
>matching devise without a plan ? It is supposed to tune to a 1.1 SWR,
>and have a 9+db gain.

You don't describe your matching scheme (gamma,T,...) - you'll have to
fiddle with that from here


>
>Also, used my MFJ cross needle meter, and also my MFJ antenna system
>analyzer...both sho slightly different SWR..Any comments or ideas. I

Normal variances in calibration


Joe NA3T
[e-mail]




From Unknown Wed Dec 13 14:37:10 1995
Path: news.epix.net!news.sprintlink.net!newshub.cts.com!usc!chi-news.cic.net!newsfeed.internetmci.com!in1.uu.net!EU.net!peer-news.britain.eu.net!yama.mcc.ac.uk!io.salford.ac.uk!aber!bath.ac.uk!bell.ukonline.co.uk!ukonline.co.uk!david.j2
From: David Johnson <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How do I keep my computer from spewing rf?
Date: Sat, 9 Dec 1995 19:39:05 +0000
Organization: (NON)
Lines: 18
Distribution: world
Message-ID: <cBO2$[e-mail]>
References: <49leke$[e-mail]>
 <[e-mail]>
NNTP-Posting-Host: lon5-37.ukonline.co.uk
Mime-Version: 1.0

Another point to consider is how well decoupled is your antenna feeder?
I used to use a co-ax fed multi-band hf dipole, complete with the usual
balun, this always resulted in some computer hash on the radio. As an
experiment I tried an open wire fed doublet antenna with a short (18")
length of co-ax to a 4:1 balun connected straight to the back of my TS-
850SAT, wow what a difference, the interaction between the computer and
the radio had improved by quite a few dB's.

I have had a similar problem with a DeeCom 4m aerial and my tnc,
replacing the amateur DeeCom aerial with a commercial low band end fed
aerial on the same feeder reduced a hash problem to the point where it
wasn't significant.

This obviously doesn't "cure" the computer from throwing out spurious
signals, but it might help avoid picking so much of it up!

--
David Johnson


From Unknown Wed Dec 13 14:37:11 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.texas.net!news1.best.com!sdd.hp.com!swrinde!ihnp4.ucsd.edu!newshub.nosc.mil!news!horowitz
From: [e-mail] (Alan M. Horowitz)
Subject: Re: How do I keep my computer from spewing rf?
Message-ID: <[e-mail]>
Sender: [e-mail]
Organization: NCCOSC RDT&E Division, San Diego, CA
References: <49leke$[e-mail]>  <[e-mail]> <cBO2$[e-mail]>
Date: Wed, 13 Dec 1995 01:05:40 GMT
Lines: 2

These "turbo" switches on the computers themself - don't these things work by
speeding up the clock rate? The faster the clock, the stronger the RF harmonics


From Unknown Wed Dec 13 14:37:12 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!ulowell.uml.edu!vtc.tacom.army.mil!news2.acs.oakland.edu!detroit.freenet.org!detroit.freenet.org!rburgan
From: [e-mail] (Roland B. Burgan)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How To Repair Ceramic Switch?
Date: 11 Dec 1995 15:53:37 GMT
Organization: The Greater Detroit Free-Net
Lines: 7
Message-ID: <4ahk61$[e-mail]>
NNTP-Posting-Host: detroit.freenet.org


You might try and get some small diameter thruput sleeves, used
in printed circuit board production.  These could be used in the
same way as rivets, just tap a head on each end. A little Crazy
Glue in addition would help keep the finger in place during
operation later.
--


From Unknown Wed Dec 13 14:37:13 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsserver.jvnc.net!raffles.technet.sg!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How to? (was Re: Plate Choke - Where can I find?)
Date: 9 Dec 1995 01:41:50 GMT
Organization: Pacific Internet, Singapore
Lines: 2
Message-ID: <4aapgu$[e-mail]>
References: <[e-mail]> <49cfsv$[e-mail]> <49e4vl$[e-mail]> <[e-mail]>
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To: [e-mail]

contavt me



From Unknown Wed Dec 13 14:37:14 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!hearye.mlb.semi.harris.com!babylon5.ccd.harris.com!not-for-email
From: [e-mail] (Doug Snowden)
Newsgroups: rec.radio.amateur.homebrew
Subject: Japanese 2SC380Y substitute ?
Date: 11 Dec 1995 10:25:10 -0500
Organization: Harris Controls Division
Lines: 9
Message-ID: <4ahigm$[e-mail]>
NNTP-Posting-Host: rs2.ccd.harris.com
X-Newsreader: TIN [version 1.2 PL2]

What is a substitute for the 2SC380Y ? Would a 2N2222 work ? They are
both npn, but I don't know if the specs are close enough...

Doug, N4IJ [e-mail]

--
Doug  Snowden
[e-mail]



From Unknown Wed Dec 13 14:37:15 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!noc.near.net!usenet.continental.com!usenet
From: "Paul Christensen, N9AZ" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: JFET Source Resistor
Date: 11 Dec 1995 14:31:04 GMT
Organization: Continental Cablevision
Lines: 16
Message-ID: <4ahfb8$[e-mail]>
References: <4a2jvk$[e-mail]>
NNTP-Posting-Host: 169.152.167.70
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)
To: [e-mail]

The method I use comes from my trusted first-year, EE college textbook:

Find the transconductance value of the FET from the data sheet.  If it's
given a range, take the geometric mean of the two values.  The source
resistor value is the reciprocal of the Gmo (transconductance value).

Example:

My MPF-102 data sheet shows a Gmo value of 5,500 uS. The reciprocal is
181.8 ohms.  180 ohm resistors are generally easy to find and will work
quite well.

Of course, a measured Gmo value will give a more accurate result.

-Paul, N9AZ



From Unknown Wed Dec 13 14:37:16 1995
Path: news.epix.net!news.sprintlink.net!rain.fr!world-net!client4.sct.fr!user
From: [e-mail] (Cyril Parisot)
Newsgroups: rec.radio.amateur.homebrew
Subject: Kenwood R5000 software
Date: Tue, 12 Dec 1995 01:44:48 +0200
Organization: Publicis Design
Lines: 5
Message-ID: <[e-mail]>
NNTP-Posting-Host: client4.sct.fr

I am searching a macintosh software for a Kenwood R5000, and I have found
only "FreqValet" is there another soft ?


Thanks


From Unknown Wed Dec 13 14:37:17 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!news.interlog.com!news
From: [e-mail] (David Mulligan)
Newsgroups: sci.electronics.design,sci.electronics,sci.electronics.basic,sci.electronics.misc,rec.radio.amateur.homebrew
Subject: LCD counter module??
Date: 9 Dec 1995 03:48:54 GMT
Organization: None
Lines: 13
Message-ID: <4ab0v6$[e-mail]>
NNTP-Posting-Host: 205.206.66.185
Mime-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Transfer-Encoding: 8bit
X-NewsSoftware: GRn 2.1 Feb 19, 1994
Xref: news.epix.net sci.electronics.design:285 sci.electronics:161687 rec.radio.amateur.homebrew:11983

I can swear I saw an LCD counter module at work today in a test jig.  Since
I  have  no  idea  who  builds  them, and as I rarely get to the production
building at work I will probably not find out that way for a while :(

Anyways  my  question  is  are  there any LCD counter modules with external
reset?  Well what I am trying to achive is a frequency counter, basically I
need  the  each  digit  to act like a cascading decade counter, to be reset
once a second, 10 times a second etc...  Or is there a better way?

Thanks a bunch....

David
[e-mail]


From Unknown Wed Dec 13 14:37:18 1995
Newsgroups: sci.electronics.design,sci.electronics,sci.electronics.basic,sci.electronics.misc,rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netcom.com!mzenier
From: [e-mail] (Mark Zenier)
Subject: Re: LCD counter module??
Message-ID: <[e-mail]>
Followup-To: sci.electronics.design,sci.electronics,sci.electronics.basic,sci.electronics.misc,rec.radio.amateur.homebrew
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
References: <4ab0v6$[e-mail]>
Date: Sat, 9 Dec 1995 21:20:16 GMT
Lines: 16
Sender: [e-mail]
Xref: news.epix.net sci.electronics.design:315 sci.electronics:161823 rec.radio.amateur.homebrew:12016

in <4ab0v6$[e-mail]>, David Mulligan wrote:
: Anyways  my  question  is  are  there any LCD counter modules with external
: reset?  Well what I am trying to achive is a frequency counter, basically I
: need  the  each  digit  to act like a cascading decade counter, to be reset
: once a second, 10 times a second etc...  Or is there a better way?

I think Optoelectronics, the frequency counter people sell as module
the guts to one of their counters.  Radio-Electronics magazine had a
bunch of counter projects 3-5 years ago where both Optoelectronics
and Startek had kits of various counters in their lines.

Red Lion Controls (sold by Digikey) has some counter modules, but I think
they're more process control indicators like tally counters and tachometers.

Mark Zenier  [e-mail]  [e-mail]



From Unknown Wed Dec 13 14:37:19 1995
Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!bug.rahul.net!a2i!infoseek.com!uunet!in2.uu.net!news.interlog.com!news
From: [e-mail] (David Mulligan)
Newsgroups: sci.electronics.design,sci.electronics,sci.electronics.basic,sci.electronics.misc,rec.radio.amateur.homebrew
Subject: Re: LCD counter module??
Date: 11 Dec 1995 03:24:38 GMT
Organization: None
Lines: 23
Message-ID: <4ag89m$[e-mail]>
References: <4ab0v6$[e-mail]> <[e-mail]>
NNTP-Posting-Host: skipper.interlog.com
Mime-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Transfer-Encoding: 8bit
X-NewsSoftware: GRn 2.1 Feb 19, 1994
Xref: news.epix.net sci.electronics.design:320 sci.electronics:161857 rec.radio.amateur.homebrew:12024


In article <[e-mail]> [e-mail] (Mark Zenier) writes:
> in <4ab0v6$[e-mail]>, David Mulligan wrote:
> : Anyways  my  question  is  are  there any LCD counter modules with external
> : reset?  Well what I am trying to achive is a frequency counter, basically I
> : need  the  each  digit  to act like a cascading decade counter, to be reset
> : once a second, 10 times a second etc...  Or is there a better way?
>
> I think Optoelectronics, the frequency counter people sell as module
> the guts to one of their counters.  Radio-Electronics magazine had a
> bunch of counter projects 3-5 years ago where both Optoelectronics
> and Startek had kits of various counters in their lines.
>
> Red Lion Controls (sold by Digikey) has some counter modules, but I think
> they're more process control indicators like tally counters and tachometers.
>
> Mark Zenier  [e-mail]  [e-mail]
>

Thanks for the tips.. I will look at them.

David
[e-mail]


From Unknown Wed Dec 13 14:37:20 1995
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!news.ismi.net!usenet
From: "J. Mark Wolf" <[e-mail]>
Newsgroups: sci.electronics.design,sci.electronics,sci.electronics.basic,sci.electronics.misc,rec.radio.amateur.homebrew
Subject: Re: LCD counter module??
Date: 12 Dec 1995 00:24:25 GMT
Organization: Internet Services of Michigan - Howell, MI
Lines: 4
Message-ID: <4aii3p$[e-mail]>
References: <4ab0v6$[e-mail]>
NNTP-Posting-Host: pm1-25.ismi.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 32bit)
To: [e-mail]
Xref: news.epix.net sci.electronics.design:346 sci.electronics:161981 rec.radio.amateur.homebrew:12052

Digikey sells LCD modules that have most of the "works" built
in. They're called SUBCUB I & II. They come with data sheets as
to application circuits. Call them at [phone].



From Unknown Wed Dec 13 14:37:20 1995
Path: news.epix.net!news.sprintlink.net!chaos.aoc.nrao.edu!newshost.nmt.edu!baervan.nmt.edu!tesuque.cs.sandia.gov!ferrari.mst6.lanl.gov!newshost.lanl.gov!ncar!newsxfer.itd.umich.edu!tank.news.pipex.net!pipex!news.mathworks.com!newsfeed.internetmci.com!in1.uu.net!news.interlog.com!news
From: [e-mail] (David Mulligan)
Newsgroups: sci.electronics.design,sci.electronics,sci.electronics.basic,sci.electronics.misc,rec.radio.amateur.homebrew
Subject: Re: LCD counter module??
Date: 13 Dec 1995 00:04:48 GMT
Organization: None
Lines: 13
Message-ID: <4al5b0$[e-mail]>
References: <4ab0v6$[e-mail]> <4aii3p$[e-mail]>
NNTP-Posting-Host: skipper.interlog.com
Mime-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Transfer-Encoding: 8bit
X-NewsSoftware: GRn 2.1 Feb 19, 1994
Xref: news.epix.net sci.electronics.design:388 sci.electronics:162110 rec.radio.amateur.homebrew:12078


In article <4aii3p$[e-mail]> "J. Mark Wolf" <[e-mail]> writes:
> Digikey sells LCD modules that have most of the "works" built
> in. They're called SUBCUB I & II. They come with data sheets as
> to application circuits. Call them at [phone].
>

Any idea what the cost per unit is?

Thanks

David
[e-mail]


From Unknown Wed Dec 13 14:37:22 1995
Newsgroups: sci.electronics.design,sci.electronics,sci.electronics.basic,sci.electronics.misc,rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!chaos.aoc.nrao.edu!newshost.nmt.edu!baervan.nmt.edu!tesuque.cs.sandia.gov!news.zynet.com!imci2!newsfeed.internetmci.com!in2.uu.net!nih-csl!helix.nih.gov!not-for-mail
From: [e-mail] (Andrew_R._Mitz)
Subject: Re: LCD counter module??
Message-ID: <[e-mail]>
Followup-To: sci.electronics.design,sci.electronics,sci.electronics.basic,sci.electronics.misc,rec.radio.amateur.homebrew
Lines: 23
Sender: [e-mail] (AMDS Postmaster)
Nntp-Posting-Host: helix.nih.gov
Reply-To: [e-mail]
Organization: National_Institutes_of_Health
X-Newsreader: TIN [UNIX 1.3 950824BETA PL0]
References: <4ab0v6$[e-mail]> <4aii3p$[e-mail]> <4al5b0$[e-mail]>
Date: Wed, 13 Dec 1995 01:17:40 GMT
Xref: news.epix.net sci.electronics.design:392 sci.electronics:162123 rec.radio.amateur.homebrew:12080

David Mulligan ([e-mail]) wrote:
:
: In article <4aii3p$[e-mail]> "J. Mark Wolf" <[e-mail]> writes:
: > Digikey sells LCD modules that have most of the "works" built
: > in. They're called SUBCUB I & II. They come with data sheets as
: > to application circuits. Call them at [phone].
: >
:
: Any idea what the cost per unit is?

Expensive.  $18 to $25 just for the counters.  They are very
good if you need low current drain.
:
: Thanks
:
: David
: [e-mail]

--
------------------------------------------------------------------------
Andrew Mitz, Biomed. Eng., National Institutes | Opinions are mine alone
of Health Animal Center, Poolesville, MD       | [e-mail]
------------------------------------------------------------------------


From Unknown Wed Dec 13 14:37:22 1995
Path: news.epix.net!news.sprintlink.net!news.heurikon.com!news.ahc.ameritech.com!ddsw1!news.mcs.net!godot.cc.duq.edu!news.duke.edu!news.mathworks.com!newsfeed.internetmci.com!in1.uu.net!news.interlog.com!news
From: [e-mail] (David Mulligan)
Newsgroups: sci.electronics.design,sci.electronics,sci.electronics.basic,sci.electronics.misc,rec.radio.amateur.homebrew
Subject: Re: LCD counter module??
Date: 13 Dec 1995 04:50:41 GMT
Organization: None
Lines: 23
Message-ID: <4alm31$[e-mail]>
References: <4ab0v6$[e-mail]> <4aii3p$[e-mail]> <[e-mail]>
NNTP-Posting-Host: skipper.interlog.com
Mime-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
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X-NewsSoftware: GRn 2.1 Feb 19, 1994
Xref: news.epix.net sci.electronics.design:400 sci.electronics:162150 rec.radio.amateur.homebrew:12091


In article <[e-mail]> [e-mail] (Andrew_R._Mitz) writes:
> J. Mark Wolf ([e-mail]) wrote:
> : Digikey sells LCD modules that have most of the "works" built
> : in. They're called SUBCUB I & II. They come with data sheets as
> : to application circuits. Call them at [phone].
> :
>
> I have used these things.  Check out the maximum counting rate
> before buying.  You might consider using an Intersil chip.
> They have frequency counter chips, you add the LCD.
>

Andy,

What  kind  of  maximum  rate are you talking?  Also any idea what the part
number  is  on  that guy?  Is it one chip for a n-digit LCD?  How does that
work.  Hopefully I can find it in a dat book at work...

Thanks

David
[e-mail]


From Unknown Wed Dec 13 14:37:24 1995
Newsgroups: sci.electronics.design,sci.electronics,sci.electronics.basic,sci.electronics.misc,rec.radio.amateur.homebrew
Path: news.epix.net!uunet!in2.uu.net!nih-csl!helix.nih.gov!not-for-mail
From: [e-mail] (Andrew_R._Mitz)
Subject: Re: LCD counter module??
Message-ID: <[e-mail]>
Followup-To: sci.electronics.design,sci.electronics,sci.electronics.basic,sci.electronics.misc,rec.radio.amateur.homebrew
Lines: 18
Sender: [e-mail] (AMDS Postmaster)
Nntp-Posting-Host: helix.nih.gov
Reply-To: [e-mail]
Organization: National_Institutes_of_Health
X-Newsreader: TIN [UNIX 1.3 950824BETA PL0]
References: <4ab0v6$[e-mail]> <4aii3p$[e-mail]>
Date: Wed, 13 Dec 1995 01:15:11 GMT
Xref: news.epix.net sci.electronics.design:405 sci.electronics:162165 rec.radio.amateur.homebrew:12094

J. Mark Wolf ([e-mail]) wrote:
: Digikey sells LCD modules that have most of the "works" built
: in. They're called SUBCUB I & II. They come with data sheets as
: to application circuits. Call them at [phone].
:

I have used these things.  Check out the maximum counting rate
before buying.  You might consider using an Intersil chip.
They have frequency counter chips, you add the LCD.

-- andy


--
------------------------------------------------------------------------
Andrew Mitz, Biomed. Eng., National Institutes | Opinions are mine alone
of Health Animal Center, Poolesville, MD       | [e-mail]
------------------------------------------------------------------------


From Unknown Wed Dec 13 14:37:25 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!news.deltanet.com!news.deltanet.com!jlundgre
From: [e-mail] (John Lundgren)
Newsgroups: sci.electronics,sci.electronics.components,rec.radio.amateur.homebrew
Subject: Looking for specs of MV2113
Date: 10 Dec 1995 19:20:12 GMT
Organization: Delta Internet Services, Anaheim, CA
Lines: 30
Message-ID: <4afbtc$[e-mail]>
NNTP-Posting-Host: delta1.deltanet.com
X-Newsreader: TIN [version 1.2 PL2]
Xref: news.epix.net sci.electronics:161796 sci.electronics.components:576 rec.radio.amateur.homebrew:12010


I'm trying to find the specs for the Motorola varicap MV2113 or 2114, most
importantly the capacitance.  The closest I could find was in the ECG
manual that said the 614 will sub for the MV2111 and it has 33 pF at 4VDC.
I assume that the 2113 has a higher capacitance than the 2111.  All the
xref's that I've seen don't go any higher than the MV2111.

I tried the Moto Web page thru Engdahl's and I couldn't find anything
there, just search temorarily unavailable.

If I can find out the capacitance, I might be able to put two of the ECG
or other subs in parallel to get the required capacitance.

These are in a two lead TO-92 case.  There used to be varicaps that were
in regular glass diode cases, and I suppose they could be used, too, if I
can find a substitute.



--
#===================================================================#
|    John Lundgren - Elec Tech - Info Tech Svcs. | jlundgre@delta1  |
|       Rancho Santiago Community College        | .deltanet.com    |
|    17th St @ Bristol \ Santa Ana, CA 92706     |                  |
| My opinions are my own, and not my employer's. |                  |
|      "You can flame your brains out -- it won't take long."       |
|         I have gone out to look for myself..  If I should         |
|        return before I get back, hold me until I get here.        |
#======P=G=P==k=e=y==a=v=a=i=l=a=b=l=e==u=p=o=n==r=e=q=u=e=s=t======#



From Unknown Wed Dec 13 14:37:26 1995
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!geraldo.cc.utexas.edu!usenet
From: [e-mail] (Larry Braden)
Newsgroups: sci.electronics,sci.electronics.components,rec.radio.amateur.homebrew
Subject: Re: Looking for specs of MV2113
Date: 10 Dec 1995 20:08:59 GMT
Organization: University of Texas at Austin
Lines: 23
Message-ID: <4afeor$[e-mail]>
References: <4afbtc$[e-mail]>
NNTP-Posting-Host: slip-18-14.ots.utexas.edu
X-Newsreader: WinVN 0.92.6+
Xref: news.epix.net sci.electronics:161850 sci.electronics.components:584 rec.radio.amateur.homebrew:12023

In article <4afbtc$[e-mail]>, [e-mail] (John Lundgren) says:
>
>
>I'm trying to find the specs for the Motorola varicap MV2113 or 2114, most
>importantly the capacitance.

Hi John,

According to the Motorola Semiconductor Master Selection Guide, pub SG73/D REV 7, on page 5.1-27:

Device:                 MV2114          MV2113

pf Min:                 73.8            61.2
pf Nominal:             82              68
pf Max:                 90.2            74.8
Vr(BR)r Volts:           30             30
Cap Ratio C4/C30 Min    2.5             2.5
Q 4.0 V., 50 MHZ Typ:   100             150


Building a VFO?

73 Larry Braden KC5CWG


From Unknown Wed Dec 13 14:37:27 1995
Path: news.epix.net!news.sprintlink.net!clue.callamer.com!biggulp.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: sci.electronics,sci.electronics.components,rec.radio.amateur.homebrew
Subject: Re: Looking for specs of MV2113
Date: Mon, 11 Dec 1995 16:03:26 -0800
Organization: CallAmerica, San Luis Obispo CA USA
Lines: 43
Message-ID: <[e-mail]>
NNTP-Posting-Host: biggulp.callamer.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
NNTP-Posting-User: cbuttsch
In-Reply-To: <4afbtc$[e-mail]>
Xref: news.epix.net sci.electronics:161979 sci.electronics.components:597 rec.radio.amateur.homebrew:12049

John:  Here is what you need:
MV 2113: 68 pf at 4 vdc.  tuning ratio 3 to 1 with 30 vdc max.......
MV 2114: 82 pf at 4 vdc,  tuning ratio 3 to 1 with 30 vdc max.......
MV 2115: 100 pf, MV 2112: 56 pf, MV 2111: 47 pf, MV 2110:39 pf......
This should get you started!!  73  Cliff Buttschardt   W6HDO........

On 10 Dec 1995, John Lundgren wrote:

>


> I'm trying to find the specs for the Motorola varicap MV2113 or 2114, most
> importantly the capacitance.  The closest I could find was in the ECG
> manual that said the 614 will sub for the MV2111 and it has 33 pF at 4VDC.
> I assume that the 2113 has a higher capacitance than the 2111.  All the
> xref's that I've seen don't go any higher than the MV2111.
>
> I tried the Moto Web page thru Engdahl's and I couldn't find anything
> there, just search temorarily unavailable.
>
> If I can find out the capacitance, I might be able to put two of the ECG
> or other subs in parallel to get the required capacitance.
>
> These are in a two lead TO-92 case.  There used to be varicaps that were
> in regular glass diode cases, and I suppose they could be used, too, if I
> can find a substitute.
>
>
>
> --
> #===================================================================#
> |    John Lundgren - Elec Tech - Info Tech Svcs. | jlundgre@delta1  |
> |       Rancho Santiago Community College        | .deltanet.com    |
> |    17th St @ Bristol \ Santa Ana, CA 92706     |                  |
> | My opinions are my own, and not my employer's. |                  |
> |      "You can flame your brains out -- it won't take long."       |
> |         I have gone out to look for myself..  If I should         |
> |        return before I get back, hold me until I get here.        |
> #======P=G=P==k=e=y==a=v=a=i=l=a=b=l=e==u=p=o=n==r=e=q=u=e=s=t======#
>
>
>



From Unknown Wed Dec 13 14:37:29 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!col.hp.com!news.dtc.hp.com!hpscit.sc.hp.com!rkarlqu
From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Measuring phase-noise with HP 8640B
Date: 8 Dec 1995 18:31:02 GMT
Organization: Hewlett-Packard
Lines: 58
Message-ID: <4aa096$[e-mail]>
References: <495ui8$[e-mail]> <49t4fn$[e-mail]> <4a07jb$[e-mail]> <4a2vu8$[e-mail]>
NNTP-Posting-Host: hpscrj.scd.hp.com

In article <4a2vu8$[e-mail]>, Bob Lombardi <[e-mail]> wrote:
>
>I was under the impression that the 640 MHz is a from a SAW oscillator,
>phase-locked to the 10 MHz in a very narrow loop.  That way you get the
>crystal noise characteristics (don't know what N is but whatever N is,
>the noise is degraded by 20 log N) inside the LBW, and the good SAW
>characteristics outside the LBW.  The VCSO is better than any VCO you're
>likely to build or find, if it's made from conventional resonators.

I can see why you would think that, but actually, the SAW resonator in the
11729 is used as a crystal filter to clean up the noise floor of the
multiplied up xtal osc.  So the xtal/multiplie is responsible for good
phase noise out to about 1 kHz. from the carrier and the SAW filter is
responsible for rolling off the noise farther away.  There is a utility
mode of the 11729 where you can connect the output of the SAW filter
module back to the input and make it oscillate at 640 MHz., but that
is rarely used, for good reason.

BTW, I used that same 11729 SAW resonator to make a phase locked 640 MHz. SAW
oscillator that was used in the HP 5071 cesium clock.  But I didn't
get as good phase noise as the 8662/11729 system, although it was good
enough for its application.  I recently redesigned that module to be
a multiplied up crystal oscillator as in the 8662, although I didn't
need the extra 80 MHz. crystal filters, since my requirements were some
what laxer than the 3048 guys.  Nevertheless, I picked up some improvement
in phase noise compared to the old PLL-osc. configuration.

>This isn't my area of "ex-spurt-tease", but the gold standard is a multiplied
>crystal, right?  If you generate a comb into the microwave region from a good
>quiet source, you mix your microwave signal down to where you can measure it
>with a quieter source than the 8662 (which is pretty good, but not a Godsend).
>This is the approach that the 3048 test set uses, as well as the Comstron Phase
>noise test set, which I've only seen demos of.  (I've used the 3048 long enough
>to have a love-hate relationship with it.  Well...a tolerate-hate relationship).

If you are not entirely happy with the 3048, you might want to look at HP's
modulation domain analyzers (MDA) for measuring phase noise.

The gold standard is a multiplied crystal where the multipliers have narrow band
pass filters to clean up the noise floor.  As has been previously mentioned,
the 8662 has filtering at 80 MHz. and, I think, another frequency to do this.
Then there is the SAW filtering.  BTW, HP's Santa Rosa people have developed
a "STW" resonator that is supposed to be even better than SAW.

>73,
>Bob
>
>(yes, I wrote FilDes, but I design synthesizers for a living....)
>
>Bob Lombardi            WB4EHS in Melbourne, FL          o        \---\---\
>[e-mail]    or   [e-mail]        /\            |
>Telescope making, optics, astronomy, piano, bicycling  -\ 7   & radio |
>I've run out of things I can say in 4 lines.         (*)/(*)          |
>


Rick Karlquist N6RK
Hewlett-Packard Santa Clara Division


From Unknown Wed Dec 13 14:37:30 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (RRRath)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Measuring phase-noise with HP 8640B
Date: 9 Dec 1995 03:47:50 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 10
Sender: [e-mail]
Message-ID: <4abifm$[e-mail]>
References: <4a5dke$[e-mail]>
Reply-To: [e-mail] (RRRath)
NNTP-Posting-Host: newsbf02.mail.aol.com

Filter carrier?
I have made some experiments with x-tal notchfilters, which look very
promising,
there were already some described in german magazines, using the Xtal as a
shunt
but I have tried it in a bridge (transformer, one arm Xtal, other exact
sereis cap and  Xtals  parallel C.
Q in such a config not such a problem extremely sharp.

73s Robert DJ0RA, OE5RRL


From Unknown Wed Dec 13 14:37:30 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!nntp.coast.net!col.hp.com!news.dtc.hp.com!hpscit.sc.hp.com!rkarlqu
From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Measuring phase-noise with HP 8640B
Date: 12 Dec 1995 18:56:07 GMT
Organization: Hewlett-Packard
Lines: 22
Message-ID: <4akj87$[e-mail]>
References: <4a5dke$[e-mail]> <4abifm$[e-mail]>
NNTP-Posting-Host: hpscrj.scd.hp.com

In article <4abifm$[e-mail]>, RRRath <[e-mail]> wrote:
>Filter carrier?
>I have made some experiments with x-tal notchfilters, which look very
>promising,
>there were already some described in german magazines, using the Xtal as a
>shunt
>but I have tried it in a bridge (transformer, one arm Xtal, other exact
>sereis cap and  Xtals  parallel C.
>Q in such a config not such a problem extremely sharp.
>
>73s Robert DJ0RA, OE5RRL

Yes, that works well for noise relatively far from the carrier.  I've
done it a number of times.  However, if you're going to go to the
trouble of getting a crystal for each measurement frequency, you might
as well use the crystal to make a VCXO, which is actually easier than
making a filter.  You can then lock the VCXO to the source under test
and look at the baseband noise with an audio spectrum analyzer (home
brew 3048 architecture).

Rick Karlquist N6RK
[e-mail]


From Unknown Wed Dec 13 14:37:31 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!usenet.seri.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!howland.reston.ans.net!usc!news.cerf.net!ent-img.com!wb6hqk!bart
From: [e-mail] (Bart Rowlett)
Subject: Re: More on Talking by Light
Organization: wb6hqk
Message-ID: <[e-mail]>
References: <[e-mail]>
Date: Sat, 9 Dec 1995 16:03:11 GMT
Lines: 20

In article <[e-mail]>,
 <[e-mail]> wrote:
>I humbly suggest that 455 KHz is the wrong frequency to choose unless you are
>going to use FM.  550 KHz is just as easy to do and then you can use a $7 pocket
>radio from radio shack to do the IF.  You can't even get a box to put it in for
>$7.  They have something called a flavor radio for $6.99 in the 1994 catalog.
>You could use a AM signal to modulate the beam and send the AM from the photo
>detector into the antenna of the radio.

Good suggestion.  I"ve used those radios for all sorts of things and as
you say, there's a lot of stuff for $7.00.  They use a single chip AM
receiver, a few discrete components, a ferrite loopstick and very little
else.  Overall gain isn't very high however and a transimpedance preamp
will be required to match the detector to the RF input and provide some
low noise gain.

bart   wb6hqk

[e-mail]



From Unknown Wed Dec 13 14:37:33 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!tank.news.pipex.net!pipex!howland.reston.ans.net!EU.net!peer-news.britain.eu.net!bcc.ac.uk!news
From: [e-mail] (Dave Kirkby)
Subject: Re: NMR physicist needs help in HF-circuit desi
Sender: [e-mail] (Usenet News System)
Message-ID: <[e-mail]>
Date: Tue, 12 Dec 1995 10:57:35 GMT
Reply-To: [e-mail]
References: <4agsp7$[e-mail]>
Organization: UCL Dept of Medical Physics
Lines: 74

In article [e-mail], [e-mail] () writes:
> Hi!
>
> First I want to clear up what NMR has to do with amateur radio: we also
> deal with HF in the MHz range, need things like resonant circuits,
> impedance matching and so on.
> So the question I have may be somewhat stupid, but is ABSOLUTELY
> urgent for me. I want to get a resonance circuit at approx. 90MHz,
> consisting of a small coil as 'antenna' (<1cm long, <5mm diameter),
> one parallel capacitor (some pF) and one series capacitor (also
> some pF). It should be a parallel resonance circuit of the following
> setup:
>          ||
>    >-----||----------
>          ||    |     |
>       C2       |     |
>               ---    O
>            C1 ---    O
>                |     O coil
>                |     O
>                |     |
>               GND   GND
>
> The input is via a have-wavelenght-line, fine tuning will be done
> with a matching network after that. Now the trouble is the tuning/
> matching of the circuit shown above. Can anybody tell me a
> convenient way to do it? Tuning equipment will be a Magic-Tee and
> a vector impedance meter. Setting up a SERIES resonator is no
> problem, but the parallel troubles (BOTH Cs influence the
> resonance condition!). Hints on literature (not the radio amateurs
> handbook, I also tried to find something in it) would also
> be helpful...
>
> Thanks in advance,
>
> Thorsten Feiweier
>
> ([e-mail])

Well,
       I'm no expert on NMR - there are others here my group who know more about
NMR coils than me. However, the input impedance of the circuit you describe is
simply 1/(j w C2) plus the parallel combination of the coil L and C1, which comes out
to:


         -j            L
Zin   = ---- + -----------------
        C2 w        -j
               C1 (---- + j L w)
                   C1 w

where w = omega= 2 pi f = 6.28 x 90 x 10^6 in your case.

If you re-arrange this to get the real and imaginary parts sepparately and solve
to find the conditions that lead to zero imaginary (reactive) component. Something
like Mathematica would make life easier, but it should not be too difficult. From
what I do know of NMR, the coils must often be balanced, Q is important ...
E-mail [e-mail]  (Matthew Celmence). He has made a number of NMR coils,
derived resonance conditions, has papers on it ....


---
Dave Kirkby
Dept of Medical Physics,
University College London,
11-20 Capper St,
London WC1E 6JA
Tel: [phone]
Fax: [phone]






From Unknown Wed Dec 13 14:37:34 1995
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!ames!agate!howland.reston.ans.net!Germany.EU.net!Dortmund.Germany.EU.net!Uni-Dortmund.DE!thorsten
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: NMR physicist needs help in HF-circuit design
Date: 11 Dec 1995 09:14:15 GMT
Organization: University of Dortmund, Germany
Lines: 37
Message-ID: <4agsp7$[e-mail]>
NNTP-Posting-Host: fuj.physik.uni-dortmund.de
X-Newsreader: TIN [version 1.2 PL2]

Hi!

First I want to clear up what NMR has to do with amateur radio: we also
deal with HF in the MHz range, need things like resonant circuits,
impedance matching and so on.
So the question I have may be somewhat stupid, but is ABSOLUTELY
urgent for me. I want to get a resonance circuit at approx. 90MHz,
consisting of a small coil as 'antenna' (<1cm long, <5mm diameter),
one parallel capacitor (some pF) and one series capacitor (also
some pF). It should be a parallel resonance circuit of the following
setup:
         ||
   >-----||----------
         ||    |     |
      C2       |     |
              ---    O
           C1 ---    O
               |     O coil
               |     O
               |     |
              GND   GND

The input is via a have-wavelenght-line, fine tuning will be done
with a matching network after that. Now the trouble is the tuning/
matching of the circuit shown above. Can anybody tell me a
convenient way to do it? Tuning equipment will be a Magic-Tee and
a vector impedance meter. Setting up a SERIES resonator is no
problem, but the parallel troubles (BOTH Cs influence the
resonance condition!). Hints on literature (not the radio amateurs
handbook, I also tried to find something in it) would also
be helpful...

Thanks in advance,

Thorsten Feiweier

([e-mail])


From Unknown Wed Dec 13 14:37:35 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!uwm.edu!fnnews.fnal.gov!unixhub!ditka!wetware!wsrcc.com!news.orst.edu!news
From: [e-mail] (Johan Forrer)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NMR physicist needs help in HF-circuit design
Date: Mon, 11 Dec 95 09:34:55 PST
Organization: University Computing Services - Oregon State University
Lines: 54
Message-ID: <4ahpjg$[e-mail]>
References: <4agsp7$[e-mail]>
NNTP-Posting-Host: frl234.frl.orst.edu
Mime-Version: 1.0
X-Newsreader: WinVN 0.93.9

Dear Thorsten,

You may want to look at Fuhushima's book: "Experimental Pulse NMR - A
Nuts and Bolts Approach" published by Addison-Wesley. Authors: E.
Fukushima and SBW Roeder, 1981. It has some pretty good ideas and also a
wealth of references - many to issues of "The Review of Scientific
Instruments", that I am sure you are aware of, especially those dealing
with the early days of NMR. If not, it is really worth looking into.

Good luck.

--Johan Forrer, KC7WW

In article <4agsp7$[e-mail]>,
[e-mail] says...
>
>Hi!
>
>First I want to clear up what NMR has to do with amateur radio: we also
>deal with HF in the MHz range, need things like resonant circuits,
>impedance matching and so on.
>So the question I have may be somewhat stupid, but is ABSOLUTELY
>urgent for me. I want to get a resonance circuit at approx. 90MHz,
>consisting of a small coil as 'antenna' (<1cm long, <5mm diameter),
>one parallel capacitor (some pF) and one series capacitor (also
>some pF). It should be a parallel resonance circuit of the following
>setup:
>         ||
>   >-----||----------
>         ||    |     |
>      C2       |     |
>              ---    O
>           C1 ---    O
>               |     O coil
>               |     O
>               |     |
>              GND   GND
>
>The input is via a have-wavelenght-line, fine tuning will be done
>with a matching network after that. Now the trouble is the tuning/
>matching of the circuit shown above. Can anybody tell me a
>convenient way to do it? Tuning equipment will be a Magic-Tee and
>a vector impedance meter. Setting up a SERIES resonator is no
>problem, but the parallel troubles (BOTH Cs influence the
>resonance condition!). Hints on literature (not the radio amateurs
>handbook, I also tried to find something in it) would also
>be helpful...
>
>Thanks in advance,
>
>Thorsten Feiweier
>
>([e-mail])



From Unknown Wed Dec 13 14:37:37 1995
Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!vixen.cso.uiuc.edu!usenet
From: Carl Gregory <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NMR physicist needs help in HF-circuit design
Date: 11 Dec 1995 19:20:46 GMT
Organization: Univ. of Illinois / Biomedical Magnetic Resonance Lab
Lines: 43
Message-ID: <4ai0af$[e-mail]>
References: <4agsp7$[e-mail]>
NNTP-Posting-Host: magnet.beckman.uiuc.edu
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.12(Macintosh; I; PPC)
To: [e-mail]
X-URL: news:4agsp7$[e-mail]

[e-mail] () wrote:
>The input is via a have-wavelenght-line, fine tuning will be done
>with a matching network after that. Now the trouble is the tuning/
>matching of the circuit shown above. Can anybody tell me a
>convenient way to do it? Tuning equipment will be a Magic-Tee and
>a vector impedance meter. Setting up a SERIES resonator is no
>problem, but the parallel troubles (BOTH Cs influence the
>resonance condition!). Hints on literature (not the radio amateurs

The easiest tuning setup to use is an rf bridge with a diode detector,
a swept-frequency rf generator, and an oscilloscope (low freq only  -
need not display the actual rf signal, just the diode-rectified result)
for the display.  With this setup, you will see a voltage which is
related to the reflection coefficient of the probe plus cable.  The
voltage goes to zero when the circuit is matched.  Adjust the parallel
capacitor to put the "dip" at the desired (Larmor) frequency.  This
usually requires a couple of iterations.

The setup described above is built in to many commercial NMR systems
(e.g. Nicolet, GE-NMR, Tecmag, possibly some Bruker systems, and
others).  The bridge circuit may be taken from the amateur radio
handbooks.  I like a Wavetek 2061 signal generator, but there are lots
of other suitable ones (an old TV-repair sweep generator, once used for
IF-strip alignment, can be modified for the desired frequency if cost is
a concern).

I do not recommend remote tuning via the half-wave cable, unless it is
absolutely necessary (e.g. the probe is in a He cryostat).  This is
because:
1) the tuning and matching range will be severely limited.
2) there are significant losses in the half-wave cable (reducing snr).

Good luck!

Carl Gregory
Biomedical Magnetic Resonance Laboratory
College of Medicine
University of Illinois
1307 W Park St
Urbana, IL 61801
(217)-244-2350




From Unknown Wed Dec 13 14:37:38 1995
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!news.kreonet.re.kr!news.dacom.co.kr!news.netins.net!newsrelay.netins.net!solaris.cc.vt.edu!newsfeed.internetmci.com!in1.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!SantaFe!usenet
From: Jim Potter <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NMR physicist needs help in HF-circuit design
Date: Mon, 11 Dec 1995 15:27:12 -0700
Organization: JP Accelerator Works, Inc.
Lines: 29
Message-ID: <[e-mail]>
References: <4agsp7$[e-mail]>
NNTP-Posting-Host: dial130.roadrunner.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b3 (WinNT; I)
To: [e-mail]

Years ago I helped a fellow graduate student who need 22 MHz
inside his dewar for a double resonance experiment.  We used a
quarter wave line, matched to a 50 ohm source at the shorted end
and tweaked the tuning with a variable capacitor in a box just
above the dewar where the line size shrank to go into the dewar.
The line outside the dewar was 2" or 3" ID because we were
trying to get a high voltage at the experiment and required
several hundred watts to overcome the losses in the resonator.

Basically, if the line is relatively short, all the higher order
modes will be relatively far away in frequency.  If you use a
quarter wave line, your operating resonance will be the lowest
one.

All of this is straightforward.  What exactly is the problem?
Do you want to match to a 50 ohm source/load?  Why are the
capacitors there?  If the are the first approximation to an
impedance match there is no reason not to use them, but if the
object is to extract as much energy as possible from the
circuit, the don't do much for you except possibly add
dielectric loss.

Jim

--
James M. Potter, President      E-mail: [e-mail]
JP Accelerator Works, Inc.      URL: www.jpaw.com/jpaw/
2245 47th Street                Voice: 505-662-5804
Los Alamos, NM 87544-1604       FAX: [phone]


From Unknown Wed Dec 13 14:37:39 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!pacifier!news
From: jgoecks <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NMR physicist needs help in HF-circuit design
Date: 12 Dec 1995 07:21:18 GMT
Organization: Pacifier BBS, Vancouver, Wa.  ([phone])
Lines: 76
Message-ID: <4ajahe$[e-mail]>
References: <4agsp7$[e-mail]>
NNTP-Posting-Host: ip152.van4.pacifier.com

[e-mail] () wrote:
>
> Hi!
>
> First I want to clear up what NMR has to do with amateur radio: we also
> deal with HF in the MHz range, need things like resonant circuits,
> impedance matching and so on.
> So the question I have may be somewhat stupid, but is ABSOLUTELY
> urgent for me. I want to get a resonance circuit at approx. 90MHz,
> consisting of a small coil as 'antenna' (<1cm long, <5mm diameter),
> one parallel capacitor (some pF) and one series capacitor (also
> some pF). It should be a parallel resonance circuit of the following
> setup:
>          ||
>    >-----||----------
>          ||    |     |
>       C2       |     |
>               ---    O
>            C1 ---    O
>                |     O coil
>                |     O
>                |     |
>               GND   GND
>
> The input is via a have-wavelenght-line, fine tuning will be done
> with a matching network after that. Now the trouble is the tuning/
> matching of the circuit shown above. Can anybody tell me a
> convenient way to do it? Tuning equipment will be a Magic-Tee and
> a vector impedance meter. Setting up a SERIES resonator is no
> problem, but the parallel troubles (BOTH Cs influence the
> resonance condition!). Hints on literature (not the radio amateurs
> handbook, I also tried to find something in it) would also
> be helpful...
>
> Thanks in advance,
>
> Thorsten Feiweier
>
> ([e-mail])


It looks to me that C2 is used to isolate the coil from DC.  C1 and
the coil should set the resonant frequency.  The ARRL Radio Amateur's
Handbook says that L=(a^2)(n^2)/(9*a+10*b)

where L is in uH
a= coil radius in inches
b=coil length in inches
n=number of turns.

Use the size of wire that will just complete the number of turns
required in the space required in order to have the stiffest coil.

Use a large C2 to take out as much of its influence as possible.

At 90MHz, you can tune the resonant tank circuit in various ways.

One is to get a "gate dip oscillator" that couples to the coil
and displays when the tank circuit is resonant.

Another is to feed the circuit from an oscillator through a resistor
and adjust to get least current flow through the resistor, since
the tank circuit is maximum impedance at resonance. You do have to
be careful not to load the circuit with probes.




Hope this helps,






Jim Goecks WA7UKS


From Unknown Wed Dec 13 14:37:41 1995
Path: news.epix.net!uunet!in1.uu.net!EU.net!Germany.EU.net!Dortmund.Germany.EU.net!Uni-Dortmund.DE!thorsten
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NMR physicist needs help in HF-circuit design
Date: 12 Dec 1995 15:15:19 GMT
Organization: University of Dortmund, Germany
Lines: 43
Message-ID: <4ak6a7$[e-mail]>
References: <4agsp7$[e-mail]> <4ajahe$[e-mail]>
NNTP-Posting-Host: ara.physik.uni-dortmund.de
X-Newsreader: TIN [version 1.2 PL2]

Hi!

Some of you wanted further information on my problem
(thanks a lot for your postings!).
The trouble is, that I have no straightforward way to get this
circuit
1. on resonance
2. matched to 50Ohms

A simple parallel resonator would be no problem, the resonance
condition given via w=1/(SQRT(LC)). The second capacitor (C2)
shall now be used to get the whole thing to 50Ohms. The trouble
with this is, that the resonance condition now no longer is
the above one, but w=1/(SQRT(L(C1+C2))) (if I have calculated this
right... I looked for maximum Voltage over the coil for a given
source voltage). Now I don't know how to simultanously get
the resonance AND the 50Ohm matching.

You're right when you say, that I will have a small bandwith. The losses
along the line should be small if the circuit is nearly matched
(according to a paper by Mark S. Conradi). The splitting in
resonance-circuit at the probe --- matching/tuning circuit after
n*lambda/2 is for my application absolutely necessery.


: >          ||
: >    >-----||----------
: >          ||    |     |
: >       C2       |     |
: >               ---    O
: >            C1 ---    O
: >                |     O coil
: >                |     O
: >                |     |
: >               GND   GND
: >


Hoping for further help,

Thorsten Feiweier

([e-mail])


From Unknown Wed Dec 13 14:37:42 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!SantaFe!usenet
From: Jim Potter <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NMR physicist needs help in HF-circuit design
Date: Tue, 12 Dec 1995 19:15:04 -0700
Organization: JP Accelerator Works, Inc.
Lines: 49
Message-ID: <[e-mail]>
References: <4agsp7$[e-mail]> <4ajahe$[e-mail]> <4ak6a7$[e-mail]>
NNTP-Posting-Host: dial130.roadrunner.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b3 (WinNT; I)
To: [e-mail]

[e-mail] wrote:
Given L you want to get two equations in two unknowns to solve
for C1 and C2.  These equations are the impedance match
condition and the resonance condition.

Consider a circuit like the one you drew with the addition of a
resistance R1 in parallel with the coil, and call the coil L1.
The resistance represents the losses of the coil and any
coupling of the circuit to the outside world.

Now add a voltage generator with source impedance Rg from ground
to C2 input terminal.  The impedance Z of the generator + the
coupling capacitance C2 is Z = Rg + 1 / (jwC2).  (w is the
angular frequency of excitation, omega)  Convert the impedance Z
to a shunt circuit with admittance Y= 1/Z.  You get
Y=(Rg-1/(jwC2))/(Rg^2 + 1/(w^2 C2^2)).  The real (resistive
part) of that is Rs=Rg(1+1/(w^2 C2^2 Rg^2).  This is the
resitance of the generator  transformed by C2 to be in parallel
with R1.  Impedance match is achieved when Rs = R1.  Thus, given
Rg, L1 and R1, (or Rg, L1, Q1 = w L1/R1) you can calculate C2.

The reactive (susceptive to be pedantic) part of the shunt
equivalent of Rg and C2 in series is just the imaginary part of
Y.  Namely, w C2/(1+w^2 Rg^2 C2^2).  For a High Q circuit this
will be indistinguishable from w C2.  But let's not make any
approximations at this point.  Resonance occurs when the
capacitive susceptance equals the inductive susceptance. That is
w C2/(1 + w^2 Rg^2 C^2) +w C1 = w L1.  Since you already know
C2, w and L1, you can solve for C1.  Note that, for high Q, the
resonance condition is very close to w^2=1/(L1 (C1 + C2)).

Is this what you are trying to do?

Don't worry about an exact match, the losses with VSWR = 1.5,
which implies that Rs = 1.5 Rg OR Rs = Rg/1.5, results in a loss
of signal power of only 4%.  The loss for 2:1 mismatch is 11%,
which is probably not a big problem.  The additional losses in
the line due to the VSWR are very low compared to the normal
attenuation.

Good luck,

Jim

--
James M. Potter, President      E-mail: [e-mail]
JP Accelerator Works, Inc.      URL: www.jpaw.com/jpaw/
2245 47th Street                Voice: 505-662-5804
Los Alamos, NM 87544-1604       FAX: [phone]


From Unknown Wed Dec 13 14:37:43 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!news.cais.net!netaxs.com!usenet
From: Rocci <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PC Board Proto:  Software
Date: Sat, 09 Dec 1995 16:43:22 -0800
Organization: Net Access - Philadelphia's Internet Connection
Lines: 11
Message-ID: <[e-mail]>
References: <49veqt$[e-mail]> <49vlbv$[e-mail]> <[e-mail]>
NNTP-Posting-Host: slip-748.netaxs.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b2a (Windows; I; 16bit)

> I am interested in some shareware layout and or schematic software
that
> is supported on the major platforms so that everyone can use it.


Try these sites:
http://www.cadvision.com/htmls/apc/nwdef.html#DFWare
http://engr-www.unl.edu/ee/eeshop/cad.html

Joe
WA3CMQ


From Unknown Wed Dec 13 14:37:44 1995
Path: news.epix.net!news.sprintlink.net!aimnet.com!ns2.mainstreet.net!bug.rahul.net!a2i!sierra.net!psyber.com!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PC Board Proto:  Software
Date: 8 Dec 1995 16:15:06 GMT
Organization: Psyberware Internet Access
Lines: 13
Message-ID: <4a9oaa$[e-mail]>
References: <49veqt$[e-mail]>
NNTP-Posting-Host: ugh.psyber.com
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)


There is a cover story in the January '96 issue of
"Electronics Now" on low cost (and some zero-cost)
PC board design software packages. They review 12
different packages, none more than $350.


Dave Hershberger, W9GR
Principal Engineer
Continental Electronics, Inc.
Nevada City, California
internet: [e-mail]



From Unknown Wed Dec 13 14:37:45 1995
Path: news.epix.net!news.sprintlink.net!news.clark.net!starport!brian.carling
Distribution: world
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Brian Carling)
References: <4aefj6$[e-mail]>
Date: Mon, 11 Dec 1995 17:01:00 -0500
Organization: =ACE= ONLINE [phone]
Subject: Re: PC Board Prototyping
Message-ID: <[e-mail]>
Lines: 9

MGRC>I use a flat-bed plotter and plot resist ink right on the copper.  Works
MGRC>pretty
MGRC>well.  Now what do you do about plated-thru holes?

There is a danger of falling through them to infinity if they are too
large! :)
---
 ■ SLMR 2.1a ■ O give me a home, where the antelope used to roam.



From Unknown Wed Dec 13 14:37:48 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!news.net99.net!news.rapidnet.com!usenet
From: Kelly Painter <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PC Board Prototyping - Ham Style
Date: 8 Dec 1995 14:27:24 GMT
Organization: RapidNet LLC
Lines: 77
Message-ID: <4a9i0d$[e-mail]>
References: <49q846$[e-mail]> <4a00tq$[e-mail]>
NNTP-Posting-Host: p5.rapidnet.com

[e-mail] (Steve Mason) wrote:
>
> In article <49q846$[e-mail]>, [e-mail]└ says...
> >
> >
> >I'd like to get a thread started on the cheap and easy ways to do
> >prototype PC boards.
>
>  Funny you should ask, your timing is impeccable.
> I just posted this yesterday on sci.electronics,
> here we go....
> By the way, for anyone not familiar with the product, PnP Blue is a plastic 8.5x11 sheet
> similar to a transparency, but with a blue coating which also transfers to the copper.
> It's made by Techniks Inc, Ringoes NJ, and available from All Electronics.
>
>
> There's been some talk about making boards with various toner transfer methods lately,
> so I thought I'd post my experience.
>
> I just finished my first PC board using the PnP Blue toner transfer sheets.
> I'm quite happy with the results.
> Here's how it went:
>
> Did the artwork with Easytrax, did some test prints on the HP LaserJet 4+ and determined the
> minimum size paper it would feed.
>
> Cut a piece of PnP Blue to the same size, and printed. The printer had no trouble feeding,
> and printing on the sheet.  So far so good.
>
> Cleaned the board, used an SOS pad, rinsed, then cleaned with isopropyl alchohol.
>
> Heated up the iron to the middle range of steam.
> Placed sheet on board and applied the iron.  Big problem!
> The sheet wrinkled, crinkled and did everything but melt (probably would have had I continued)
> I decided I was using too much heat.
>
> Cleaned board again (it was a bit harder this time, due to some of the toner transferring.
>
> Cut another sheet and printed,  again printer performed beautifully.
>
> This time, I set the iron at half the temp (just below the steam setting)
> Aligned sheet, applied iron, and it worked. I ironed for about 1 minute, which might
> have been a tad to little, as one of the 30 mil traces didn't quite transfer in one spot.
> An easy touch up with a Staedler 313 Permanent pen, and I was ready to etch.
>
> Earlier, I had made a bubble etching tank out of an old narrow square plastic container,
> an aquarium pump and a flat aquarium bubble rock. The local electronics shops want $130.00 for
> a
> bubble etcher! And it's not that much different from what I made.
>
> I mixed up a batch of ammonium persulfate 250G/1L of hot tap water, and etched away.
> The result was a very good looking board for my first attempt!
> Drilling was tougher than I thought, I used my Dremel tool in a Dremel drill press stand
> with a #68 bit. I found the bit would wander a bit as it came into contact with the
> board, but that if I pressed faster, the bit wandered less.
> The 20pin DIP will be a bit tough to insert, as a few of the holes are off a tad, but the
> 8 pin DIP, and the rest of the holes are close enough.
>
> If anybody has any drilling tips, I would like to hear them.
>
> I don't know if the circuit will work, but the board sure looks good.
>
> Sorry for rambling,
>
> Steve  VE6STV
> [e-mail]
>

I use PnP Blue for prototyping at work.  First, clean your boards with Hydrocloric acid.  This
might be toilet cleaner.  That helps the stuff stick.  Second, use a small punch to lightly
mark your holes.  I also use the Dremel.  Use high quality carbide PCB drills.  For an iron,
I use a iron used for ironing monocoat onto model airplanes.  Seems ready made for the work.

Hope this helps!

K.Painter



From Unknown Wed Dec 13 14:37:48 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!col.hp.com!usenet.eel.ufl.edu!pacifier!rainrgnews0!hevanet.com!usenet
From: "Michael G. Reiney/Myra Colter" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PC Board Prototyping - Ham Style
Date: 10 Dec 1995 11:16:54 GMT
Organization: Hevanet Communications
Lines: 3
Message-ID: <4aefj6$[e-mail]>
References: <49q846$[e-mail]> <4a00tq$[e-mail]> <4a9i0d$[e-mail]>
NNTP-Posting-Host: ke-ppp06.hevanet.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)

I use a flat-bed plotter and plot resist ink right on the copper.  Works pretty
well.  Now what do you do about plated-thru holes?



From Unknown Wed Dec 13 14:37:50 1995
Path: news.epix.net!news.sprintlink.net!news.dpc.net!news.heurikon.com!uwvax!uwm.edu!chi-news.cic.net!newsfeed.internetmci.com!news1.mnsinc.com!news
From: [e-mail] (David Allen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PC Board Prototyping - Ham Style
Date: Mon, 11 Dec 1995 06:27:26 GMT
Organization: Monumental Network Systems
Lines: 86
Message-ID: <4agivp$[e-mail]>
References: <49q846$[e-mail]> <4a00tq$[e-mail]> <4a9i0d$[e-mail]>
NNTP-Posting-Host: allent.mnsinc.com
X-Newsreader: Forte Free Agent 1.0.82

Kelly Painter <[e-mail]> wrote:

>[e-mail] (Steve Mason) wrote:
>>
>> In article <49q846$[e-mail]>, [e-mail]└ says...
>> >
>> >
>> >I'd like to get a thread started on the cheap and easy ways to do
>> >prototype PC boards.
>>
>>  Funny you should ask, your timing is impeccable.
>> I just posted this yesterday on sci.electronics,
>> here we go....
>> By the way, for anyone not familiar with the product, PnP Blue is a plastic 8.5x11 sheet
>> similar to a transparency, but with a blue coating which also transfers to the copper.
>> It's made by Techniks Inc, Ringoes NJ, and available from All Electronics.
>>
>>
>> There's been some talk about making boards with various toner transfer methods lately,
>> so I thought I'd post my experience.
>>
>> I just finished my first PC board using the PnP Blue toner transfer sheets.
>> I'm quite happy with the results.
>> Here's how it went:
>>
>> Did the artwork with Easytrax, did some test prints on the HP LaserJet 4+ and determined the
>> minimum size paper it would feed.
>>
>> Cut a piece of PnP Blue to the same size, and printed. The printer had no trouble feeding,
>> and printing on the sheet.  So far so good.
>>
>> Cleaned the board, used an SOS pad, rinsed, then cleaned with isopropyl alchohol.
>>
>> Heated up the iron to the middle range of steam.
>> Placed sheet on board and applied the iron.  Big problem!
>> The sheet wrinkled, crinkled and did everything but melt (probably would have had I continued)
>> I decided I was using too much heat.
>>
>> Cleaned board again (it was a bit harder this time, due to some of the toner transferring.
>>
>> Cut another sheet and printed,  again printer performed beautifully.
>>
>> This time, I set the iron at half the temp (just below the steam setting)
>> Aligned sheet, applied iron, and it worked. I ironed for about 1 minute, which might
>> have been a tad to little, as one of the 30 mil traces didn't quite transfer in one spot.
>> An easy touch up with a Staedler 313 Permanent pen, and I was ready to etch.
>>
>> Earlier, I had made a bubble etching tank out of an old narrow square plastic container,
>> an aquarium pump and a flat aquarium bubble rock. The local electronics shops want $130.00 for
>> a
>> bubble etcher! And it's not that much different from what I made.
>>
>> I mixed up a batch of ammonium persulfate 250G/1L of hot tap water, and etched away.
>> The result was a very good looking board for my first attempt!
>> Drilling was tougher than I thought, I used my Dremel tool in a Dremel drill press stand
>> with a #68 bit. I found the bit would wander a bit as it came into contact with the
>> board, but that if I pressed faster, the bit wandered less.
>> The 20pin DIP will be a bit tough to insert, as a few of the holes are off a tad, but the
>> 8 pin DIP, and the rest of the holes are close enough.
>>
>> If anybody has any drilling tips, I would like to hear them.
>>
>> I don't know if the circuit will work, but the board sure looks good.
>>
>> Sorry for rambling,
>>
>> Steve  VE6STV
>> [e-mail]
>>

>I use PnP Blue for prototyping at work.  First, clean your boards with Hydrocloric acid.  This
>might be toilet cleaner.  That helps the stuff stick.  Second, use a small punch to lightly
>mark your holes.  I also use the Dremel.  Use high quality carbide PCB drills.  For an iron,
>I use a iron used for ironing monocoat onto model airplanes.  Seems ready made for the work.

>Hope this helps!

>K.Painter

Also, I read that fellows have best results when the absolute bare
minimum of drill shank is exposed from the chuck (just enought to get
through the board) and the table is brought as far up as possible to
minimize quill extension (and resultant wobble).   What happens with
this stuff -- do the printed traces lay down on the board or do you do
a negative image and the fields take the toner?



From Unknown Wed Dec 13 14:37:51 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!usc!chi-news.cic.net!nntp.coast.net!news2.acs.oakland.edu!detroit.freenet.org!detroit.freenet.org!rburgan
From: [e-mail] (Roland B. Burgan)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PC Board Prototyping - Ham Style
Date: 11 Dec 1995 15:55:54 GMT
Organization: The Greater Detroit Free-Net
Lines: 4
Message-ID: <4ahkaa$[e-mail]>
NNTP-Posting-Host: detroit.freenet.org


I'd like to see in addition, some reliable way to transfer PCB
diagrams from magazines, etc.
--


From Unknown Wed Dec 13 14:37:52 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!nntp-hub2.barrnet.net!nntp2.cerf.net!pelican.com!grian!morris
From: [e-mail] (Mike Morris)
Subject: Re: PC Board Prototyping - Ham Style
Message-ID: <[e-mail]>
Organization: College Park Software, Altadena, CA
References: <49q846$[e-mail]> <4a00tq$[e-mail]> <4a9i0d$[e-mail]> <4agivp$[e-mail]>
Date: Tue, 12 Dec 1995 11:37:58 GMT
Lines: 51

[e-mail] (David Allen) writes:

>Kelly Painter <[e-mail]> wrote:

>>[e-mail] (Steve Mason) wrote:

<a lot chopped>

>>> Drilling was tougher than I thought, I used my Dremel tool in a Dremel drill press stand
>>> with a #68 bit. I found the bit would wander a bit as it came into contact with the
>>> board, but that if I pressed faster, the bit wandered less.
>>> The 20pin DIP will be a bit tough to insert, as a few of the holes are off a tad, but the
>>> 8 pin DIP, and the rest of the holes are close enough.
>>>
>>> If anybody has any drilling tips, I would like to hear them.

I make sure that there is a "hole" in the center of the pad in the
artwork, so that there is a copper "donut" on the glass-epoxy. The
resulting low spot of no copper in the middle of a copper circle
acts like a center punch, and works as a drill guide.

>Also, I read that fellows have best results when the absolute bare
>minimum of drill shank is exposed from the chuck (just enought to get
>through the board) and the table is brought as far up as possible to
>minimize quill extension (and resultant wobble).

This works well also, and the drills will last much longer if you
spend the extra $ and get the carbide bits rather than the steel.
Kinda like alkaline vs carbon-zinc batteries: 5x the life for 3x the
money.

One trick that I do when I lay out a board: put your callsign,
the date and the magazine name and issue that the project was built from
on the layout: something like "WA6ILQ 9-94 from QST 6-94". Helps
when you are trying to fix it 9 years later.

I also stole an idea from DEC computer cards: add the following
string to an edge of the card "ABCDEFGH". The first time you make
a mod to the board place a solder blob on the "A". Then add a sheet
of paper to the documentation describing modification "A". If you make
another mod, blob the "B", and add a sheet to the file. Etc.
If you have several different versions of a project around, it makes
it simple to figure out the revision level.

de WA6ILQ

--
---
Mike Morris                                [e-mail]
#include <disclaimer.std.h>        I have others, but this works the best.
   This message assembled from 100% recycled electrons (and pixels).


From Unknown Wed Dec 13 14:37:53 1995
Path: news.epix.net!uunet!in1.uu.net!meaddata!newsjunkie.ans.net!news.agt.net!news
From: [e-mail] (Steve Mason)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PC Board Prototyping - Ham Style
Date: Tue, 12 Dec 1995 20:30:58 GMT
Organization: AGT Ltd.
Lines: 43
Message-ID: <[e-mail]>
References: <49q846$[e-mail]> <4a00tq$[e-mail]> <4a9i0d$[e-mail]> <4agivp$[e-mail]> <[e-mail]>
NNTP-Posting-Host: clgrpt05-port-9.agt.net
X-Newsreader: Forte Agent .99c/16.141

On Tue, 12 Dec 1995 11:37:58 GMT, [e-mail] (Mike
Morris) wrote:

>I make sure that there is a "hole" in the center of the pad in the
>artwork, so that there is a copper "donut" on the glass-epoxy. The
>resulting low spot of no copper in the middle of a copper circle
>acts like a center punch, and works as a drill guide.

I tried that but the PnP blue film doesn't do those too well.  Someone
suggested using a pin on the film before the transfer. I'll try that next
time.

>>Also, I read that fellows have best results when the absolute bare
>>minimum of drill shank is exposed from the chuck (just enought to get
>>through the board) and the table is brought as far up as possible to
>>minimize quill extension (and resultant wobble).

Tried that on my second board, and it helped somewhat.


>This works well also, and the drills will last much longer if you
>spend the extra $ and get the carbide bits rather than the steel.

I'll be looking for some before my next project.

>One trick that I do when I lay out a board: put your callsign,
>the date and the magazine name and issue that the project was built from
>on the layout: something like "WA6ILQ 9-94 from QST 6-94". Helps
>when you are trying to fix it 9 years later.

 Yep, I did that, I hate it when you go to fix something you built years ago,
and don't have a clue how or why you did it.


>I also stole an idea from DEC computer cards: add the following
>string to an edge of the card "ABCDEFGH". The first time you make
>a mod to the board place a solder blob on the "A". Then add a sheet
>of paper to the documentation describing modification "A". If you make

Great idea!  Consider it re-stolen.


Steve VE6STV


From Unknown Wed Dec 13 14:37:54 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!newsjunkie.ans.net!news-m01.ny.us.ibm.net!ausnews.austin.ibm.com!bcarwell
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PC Board Prototyping- Ham Style
Date: 11 Dec 1995 22:28:19 GMT
Organization: IBM Austin
Lines: 15
Distribution: world
Message-ID: <4aiba3$[e-mail]>
NNTP-Posting-Host: patlaw.austin.ibm.com
Originator: [e-mail]


Keywords:

   A few days ago somebody posted 2 FAQS on prototyping.  Could someone
 please send them to me or tell me where I can find them ?

        Thanks,

        Bob


--
 __                [e-mail]
|__)  __  |__
|__) (__) |__)


From Unknown Wed Dec 13 14:37:55 1995
Path: news.epix.net!news.sprintlink.net!news.dpc.net!news.heurikon.com!uwvax!uwm.edu!cs.utexas.edu!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!comp.vuw.ac.nz!central.co.nz!usenet
From: [e-mail]@central.co.nz (Barry Lennox)
Newsgroups: rec.radio.amateur.homebrew
Subject: PCB Etching
Date: 12 Dec 1995 07:58:05 GMT
Organization: Personal
Lines: 11
Message-ID: <4ajcmd$[e-mail]>
NNTP-Posting-Host: barryl.central.co.nz
X-Newsreader: WinVN 0.99.7

Some years ago there was an article in the now-defunct "Ham Radio" on PCB
etchants. I recall the best solution was Cupric chloride and some other
additives. The really cute thing was that it was possible to regenerate the
solution by overnight aeration. (I think that it was possible to end up with
more etchant than you started with.)

Anybody have this article ? More importantly, has anybody tried it with
success?

Barry Lennox



From Unknown Wed Dec 13 14:37:56 1995
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!in1.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!SantaFe!usenet
From: Jim Potter <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Quick and dirty demostration of AM
Date: Sat, 09 Dec 1995 07:28:07 -0700
Organization: JP Accelerator Works, Inc.
Lines: 32
Message-ID: <[e-mail]>
References: <4a9g80$[e-mail]>
NNTP-Posting-Host: dial132.roadrunner.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b3 (WinNT; I)
To: "Douglas L. Datwyler" <[e-mail]>

Douglas L. Datwyler wrote:
>
> I need to know of a quick and dirty (EASY) demostration of AM modulation for
> an upcoming Boy Scout round table. HINTS, or outright answers are welcome.
>
> Douglas L. Datwyler  WR7O
> [e-mail]

To modernize something a friend and I did many years ago, you
might consider the following:  Use a small audio amplifier (the
"modulator") to light a LED. (We used a neon bulb)  You will
need some dc bias (the "transmitter") to provide a carrier.  For
amplitude detection we were able to borrow a 16mm movie
projector.  The audio portion of that has a phototube and audio
amplifier.  So, all you have to do is dim the lights ("QRM") and
shine the LED in the direction of the phototube.  It's somewhat
less "quick-and-dirty" if you have to make your own light
detector, but a phototransistor and an audio amplifier might not
be too complicated.

This demonstrates AM with the added bonus that the signal is
visible.

Good luck,

73 de K9GXC, Jim

--
James M. Potter, President      E-mail: [e-mail]
JP Accelerator Works, Inc.      URL: www.jpaw.com/jpaw/
2245 47th Street                Voice: 505-662-5804
Los Alamos, NM 87544-1604       FAX: [phone]


From Unknown Wed Dec 13 14:37:57 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!usenet.eel.ufl.edu!newsfeed.internetmci.com!info.ucla.edu!psgrain!nntp.teleport.com!usenet
From: [e-mail] (Roy Lewallen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Quick and dirty demostration of AM
Date: 10 Dec 1995 07:10:24 GMT
Organization: ELNEC/EZNEC Software
Lines: 15
Message-ID: <4ae150$[e-mail]>
References: <4abbjk$[e-mail]>
NNTP-Posting-Host: ip-pdx02-02.teleport.com
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

>   [e-mail] (Rhyolite95) writes:
>  Use an audio amplifier to power a lightbulb from an audio source. Connect
>  a photocell to the input of another audio amplifer and speaker. The audio
>  from the first amplifier will make the lightbulb flash and the second
>  amplifier will reproduce the modulation of the light "carrier".
>
>>>>

Wonder if you've tried this. Since an incandescent bulb doesn't noticeably
at 60 Hz, I'd be surprised if it would follow audio at all. The scheme
should work with an LED, although the distortion might be pretty bad due
to the nonlinear nature of the LED and detector.

Roy Lewallen, W7EL



From Unknown Wed Dec 13 14:37:58 1995
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.uoregon.edu!psgrain!nntp.teleport.com!usenet
From: [e-mail] (Roy Lewallen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Quick and dirty demostration of AM
Date: 10 Dec 1995 07:12:03 GMT
Organization: ELNEC/EZNEC Software
Lines: 2
Message-ID: <4ae183$[e-mail]>
References: <4abbjk$[e-mail]>
NNTP-Posting-Host: ip-pdx02-02.teleport.com
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

I meant to say, noticeably flicker. . .
                           ^^^^^^^


From Unknown Wed Dec 13 14:37:59 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!news.ksu.ksu.edu!news.cis.okstate.edu!master.ceat.okstate.edu!gcouger
From: [e-mail] (COUGER GORDON)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Quick and dirty demostration of AM
Date: 10 Dec 1995 09:20:23 GMT
Organization: CEAT at Oklahoma State University, Stillwater
Lines: 33
Message-ID: <4ae8on$[e-mail]>
References: <4abbjk$[e-mail]> <4ae150$[e-mail]>
Reply-To: Gordon Couger <[e-mail]>
NNTP-Posting-Host: master.ceat.okstate.edu

In article <4ae150$[e-mail]>,
Roy Lewallen <[e-mail]> wrote:
>>   [e-mail] (Rhyolite95) writes:
>>  Use an audio amplifier to power a lightbulb from an audio source. Connect
>>  a photocell to the input of another audio amplifer and speaker. The audio
>>  from the first amplifier will make the lightbulb flash and the second
>>  amplifier will reproduce the modulation of the light "carrier".
>>
>>>>>
>
>Wonder if you've tried this. Since an incandescent bulb doesn't noticeably
>at 60 Hz, I'd be surprised if it would follow audio at all. The scheme
>should work with an LED, although the distortion might be pretty bad due
>to the nonlinear nature of the LED and detector.
>
I cna sure see the flicker when testing some photo sensor we work with. I
have to either use a lowass filter or DC on the bulb to keep from having
alisases form hell. The sensors will only be used in sunlight so normaly
we don't filter them at all.

The level of the flicker is pretty low carried on a substantial offset. I
get a more marked 120 hz effect from floresent lights. You should be able
to frequency modulate them at autio rates. Or you might be able to do AM
with magnetic coils that choke off the energy to the bulf.  It would still
have to carry an offset to keep the bulb conducting.

Good luck
Gordon AB5DG
ZZ
Gordon Couger senior software specialist
   Biosystems & Agricultural Engineering. 114 AG Hall Stillwater, OK 74075
   [e-mail] 405 744 8392 day 625-2855 evenings



From Unknown Wed Dec 13 14:38:01 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.zynet.com!tesuque.cs.sandia.gov!SantaFe!usenet
From: Jim Potter <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Quick and dirty demostration of AM
Date: Sun, 10 Dec 1995 14:15:20 -0700
Organization: JP Accelerator Works, Inc.
Lines: 21
Message-ID: <[e-mail]>
References: <4abbjk$[e-mail]> <4ae150$[e-mail]>
NNTP-Posting-Host: dial133.roadrunner.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b3 (WinNT; I)

Roy Lewallen wrote:

snip...

> The scheme
> should work with an LED, although the distortion might be pretty bad due
> to the nonlinear nature of the LED and detector.
>
> Roy Lewallen, W7EL

All that is required is to bias the LED on (this provides the "carrier") and make
sure the audio is low enough level to avoid driving the LED off, (i.e. avoid
overmodulation) and you have a pretty good demo of AM.

Jim

--
James M. Potter, President      E-mail: [e-mail]
JP Accelerator Works, Inc.      URL: www.jpaw.com/jpaw/
2245 47th Street                Voice: 505-662-5804
Los Alamos, NM 87544-1604       FAX: [phone]


From Unknown Wed Dec 13 14:38:02 1995
Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!news.bc.net!news.mindlink.net!agate!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Tim Hynde ka8ddz/qrp Rochester, MI )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RADAR / lASER
Date: 10 Dec 1995 17:05:14 GMT
Organization: Netcom
Lines: 40
Message-ID: <4af40a$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ix-war-mi3-06.ix.netcom.com

In <[e-mail]> [e-mail] writes:
>
>Hi!
>
> > I saw a Radio Shack ad for a speed radar dectector with "ghost"
> > technology. This "ghost technology" will defeat radar dectector
> > dectectors. I know you can locate a receiver by its local
> > oscillator, but do the police use something like this? What is
> > the range of these radar detector detectors? Is it so short ranged
> > that the police carry them up to the suspect vehicle/
> >
> > Thanks for your input.
> > Harry in TX KA5IMO
>
>I can't really help but I also heard that there is laser gun now...
>
>Does anyone know if they can be detected?
>
>Well, it's only for personnal information since I live in Canada and
>these are prohibited here.  :(
>
>
>73's de   |    Fido: 1:240/118    |  Internet:
[e-mail]
>I)aniel   |  Franco: 101:155/118  |    Packet:
VE2DLX@VE2SJC.#QBC.PQ.CAN.NA
>

Laser light is easy to detect, the problem is it takes about 500ms for
the laser gun to take 10 readings and average your speed. When the
patrol officer is looking at your car through the sites the laser is
not on, when he pulls the trigger the laser turns on and he can see the
beam through the cross hairs, 1/2 sec. later, your nailed. By the time
your laser sensor goes off its too late. A lot of the radar detectors
sold now have laser detect. But if the patrolman really knows how to
use the laser system he's gonna get you.

Drive safely,

Tim, ka8ddz


From Unknown Wed Dec 13 14:38:03 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!newsfeed.internetmci.com!in2.uu.net!fonorola!Rezonet.net!qbc-clic!com18!daniel.lacasse
Newsgroups: rec.radio.amateur.homebrew
In-Reply-To: [e-mail]
Subject: Re: RADAR DETECTOR DETECT
From: [e-mail]
Message-ID: <[e-mail]>
Date: Fri, 8 Dec 95 22:51:00 EST
Organization: Babillard COM18 BBS
Lines: 23

Hi!

 > I saw a Radio Shack ad for a speed radar dectector with "ghost"
 > technology. This "ghost technology" will defeat radar dectector
 > dectectors. I know you can locate a receiver by its local
 > oscillator, but do the police use something like this? What is
 > the range of these radar detector detectors? Is it so short ranged
 > that the police carry them up to the suspect vehicle/
 >
 > Thanks for your input.
 > Harry in TX KA5IMO

I can't really help but I also heard that there is laser gun now...

Does anyone know if they can be detected?

Well, it's only for personnal information since I live in Canada and
these are prohibited here.  :(


73's de   |    Fido: 1:240/118    |  Internet: [e-mail]
I)aniel   |  Franco: 101:155/118  |    Packet: VE2DLX@VE2SJC.#QBC.PQ.CAN.NA



From Unknown Wed Dec 13 14:38:05 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!ncrgw2.ncr.com!ncrhub2!ncrcae!news
From: Bob Archer <[e-mail]>
Subject: Re: RADAR DETECTOR DETECT
Message-ID: <[e-mail]>
Sender: [e-mail] (news)
Reply-To: [e-mail] (               )
Organization: AT&T GIS GPSGSC Columbia, SC
X-Newsreader: DiscussIT 2.0 for MS Windows [AT&T Software Products Division]
References: <[e-mail]>
Date: Tue, 12 Dec 1995 16:41:56 GMT
Lines: 34

It's my understanding that the "ghost technology" is nothing more than
detection by your Radar Detector of the Police detectors local oscillator that
powers down your Radar Detector.
>==========[e-mail], 12/8/95==========
>
>Hi!
>
> > I saw a Radio Shack ad for a speed radar dectector with
>"ghost"
> > technology. This "ghost technology" will defeat radar dectector
> > dectectors. I know you can locate a receiver by its local
> > oscillator, but do the police use something like this? What is
> > the range of these radar detector detectors? Is it so short
>ranged
> > that the police carry them up to the suspect vehicle/
> >
> > Thanks for your input.
> > Harry in TX KA5IMO
>
>I can't really help but I also heard that there is laser gun now...
>
>Does anyone know if they can be detected?
>
>Well, it's only for personnal information since I live in Canada and
>these are prohibited here.  :(
>
>
>73's de   |    Fido: 1:240/118    |  Internet:
>[e-mail]
>I)aniel   |  Franco: 101:155/118  |    Packet:
>VE2DLX@VE2SJC.#QBC.PQ.CAN.NA
>
>
Bob Archer N4ECO


From Unknown Wed Dec 13 14:38:06 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Bill Hopstetter)
Newsgroups: rec.radio.amateur.homebrew
Subject: Radar Detector Detector
Date: 13 Dec 95 13:50:31 GMT
Organization: ucsd usenet gateway
Lines: 19
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]


It's funny that Radio Shack is now advertising a "shadow" radar detector.  A
few years ago they had the most "detectable" radar detectors on the market.
They used a Direct Conversion scheme where the local oscillator was right on
the same frequency as the radar.  My radar detector would always go off when
a trucker passed me using one of those things.  I could pick them up about
a 1/4 mile away if they were coming towards me (and that was with a clunky
Maxon detector).

There are radar detector detectors out there, as I have seen them.  They look
for any radiation in the 10 or 24 GHz band, generated by the local oscillators
in the radar detectors.  I haven't had a chance to check out the method on
the "stealth" or "shadow" detectors, but I hear that they use extra shielding
and pulse the LO and sample the incoming RF, rather than run the LO all the
time.

Bill    WB8LGX




From Unknown Wed Dec 13 14:38:07 1995
Path: news.epix.net!news.sprintlink.net!usit.net!news
From: [e-mail] (Kevin Kidd)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RADAR DETECTOR DETECTOR??
Date: Tue, 12 Dec 1995 19:55:46 GMT
Organization: United States Internet, Inc.
Lines: 14
Message-ID: <4akj4j$[e-mail]>
References: <4a4t96$[e-mail]>
NNTP-Posting-Host: 199.1.57.43
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Harry Howell) wrote:

>I saw a Radio Shack ad for a speed radar dectector with "ghost" technology. This "ghost technology" will defeat radar dectector dectectors. I know you ca


<<<snip>>>

Some Radar detectors are so NASTY that even another radar detector
will pick them up.

Kevin Kidd
WD4RAT
[e-mail]



From Unknown Wed Dec 13 14:38:08 1995
Path: news.epix.net!news.sprintlink.net!aimnet.com!news2.aimnet.com!dial-berk1-4.iway.aimnet.com!user
From: [e-mail] (Joe Schmoe)
Newsgroups: alt.2600,rec.radio.scanner,rec.radio.amateur.homebrew
Subject: Re: radio scanners?
Followup-To: rec.radio.scanner,rec.radio.amateur.homebrew
Date: Sun, 10 Dec 1995 22:19:54 -0800
Organization: SchmoeCo.ü
Lines: 9
Distribution: world
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: dial-berk1-4.iway.aimnet.com
Xref: news.epix.net alt.2600:148651 rec.radio.scanner:41783 rec.radio.amateur.homebrew:12021

In article <[e-mail]>, [e-mail] wrote:

 => a friend of mine has one of those scanners that are for emergency
 => purposes, so that when your car breaks down, he can contact help.
 => I was wondering,  if some how you could turn this scanner into a normal
 => police scanner, like those which you buy at radio shack?

This is a question for rec.radio.scanner or rec.radio.amateur.homebrew,
not alt.2600


From Unknown Wed Dec 13 14:38:08 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!math.ohio-state.edu!magnus.acs.ohio-state.edu!usenet.ins.cwru.edu!cleveland.Freenet.Edu!gy781
From: [e-mail] (Michael W Mathias Jr)
Newsgroups: rec.radio.scanner,rec.radio.amateur.homebrew
Subject: Re: radio scanners?
Date: 12 Dec 1995 15:08:41 GMT
Organization: Case Western Reserve University, Cleveland OH (USA)
Lines: 3
Message-ID: <4ak5tq$[e-mail]>
NNTP-Posting-Host: kanga.ins.cwru.edu
Xref: news.epix.net rec.radio.scanner:41892 rec.radio.amateur.homebrew:12067


It sounds to me your friend has a transceiver rather than a scanner
A scanner is only a receiver and can't be talked on.


From Unknown Wed Dec 13 14:38:10 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!psinntp!psinntp!psinntp!psinntp!voder!nsc!news
From: "Al Koblinski  (W7XA)" <[e-mail]>
Subject: Re: RE : PCB Debate
Content-Type: text/plain; charset=us-ascii
Message-ID: <[e-mail]>
To: jmills
Sender: [e-mail] (netnews maintenance)
Nntp-Posting-Host: akoblinski.nsc.com
Content-Transfer-Encoding: 7bit
Organization: National Semiconductor, Santa Clara
References: <[e-mail]>
Mime-Version: 1.0
Date: Fri, 8 Dec 1995 23:53:55 GMT
X-Mailer: Mozilla 1.1N (Macintosh; I; 68K)
X-Url: news:[e-mail]
Lines: 8

The radio shack PC material is very lossy at VHF and higher. I don't
precisely remember the dielectric constant but it forces very tiny
striplines.  For anything above VHF you should find a supplier of a
Glass / Teflon material.  It's a little expensive but will give superior
results and striplines that are big enough to be accurate.
Regards, Al




From Unknown Wed Dec 13 14:38:11 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!psinntp!psinntp!psinntp!psinntp!voder!nsc!news
From: "Al Koblinski  (W7XA)" <[e-mail]>
Subject: Re: RE : PCB Debate
Content-Type: text/plain; charset=us-ascii
Message-ID: <[e-mail]>
To: [e-mail]
Sender: [e-mail] (netnews maintenance)
Nntp-Posting-Host: akoblinski.nsc.com
Content-Transfer-Encoding: 7bit
Organization: National Semiconductor, Santa Clara
References: <[e-mail]>
Mime-Version: 1.0
Date: Fri, 8 Dec 1995 23:54:34 GMT
X-Mailer: Mozilla 1.1N (Macintosh; I; 68K)
X-Url: news:[e-mail]
Lines: 8

The radio shack PC material is very lossy at VHF and higher. I don't
precisely remember the dielectric constant but it forces very tiny
striplines.  For anything above VHF you should find a supplier of a
Glass / Teflon material.  It's a little expensive but will give superior
results and striplines that are big enough to be accurate.
Regards, Al




From Unknown Wed Dec 13 14:38:12 1995
Path: news.epix.net!news.sprintlink.net!news.dpc.net!news.heurikon.com!uwvax!uwm.edu!chi-news.cic.net!usc!howland.reston.ans.net!newsfeed.internetmci.com!EU.net!Germany.EU.net!netmbx.de!uriela.in-berlin.de!newsun.netmbx.de!netmbx.netmbx.de!gerhard
From: [e-mail] (Gerhard Hoffmann)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RE : PCB Debate
Date: 12 Dec 1995 07:28:22 GMT
Organization: netmbx GbR, Berlin, Germany
Lines: 21
Message-ID: <4ajaum$[e-mail]>
References: <[e-mail]> <[e-mail]> <4a9kot$[e-mail]>
NNTP-Posting-Host: netmbx2.netmbx.de

In article <4a9kot$[e-mail]>,  <[e-mail]> wrote:
>
>
>>      I've seen 3.2 listed somewhere.  I made my own measurements and
>>came up with a figure closer to 4.0
>
>The dielectric constant of ordinary green PCB is between 3.9 and 4.3, your
>measurements were good.  It varies depending on the ratio of fiberglass to
>epoxy (I think they put in more of whichever is cheaper that day!).
>
And it varies with frequency, too. For a given product, Er is
usually controlled better than board thickness.

Gerhard


--
#  Gerhard Hoffmann            #     phone: [phone]     #
#  Gleditschstr. 79            #     fax:   [phone]     #
#  D10823 Berlin               #     on the air:  dk4xp            #
#  Germany                     #     in the air:  d-1441, d-kick   #


From Unknown Wed Dec 13 14:38:13 1995
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usenet
From: Wes Stewart <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Resistor for RF power attenuator help needed
Date: 9 Dec 1995 01:28:45 GMT
Organization: Arizona Daily Star - AZSTARNET
Lines: 41
Message-ID: <4aaood$[e-mail]>
References: <4a5dnf$[e-mail]> <4a9h15$[e-mail]>
NNTP-Posting-Host: usr6ip41.azstarnet.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)

[e-mail] (W8JI  Tom) wrote:
>In article <4a5dnf$[e-mail]>, "Thomas C. J. Sefranek"
><[e-mail]> writes:
>
[snip]
>
>And you need to understand just because a resistor is metal film, carbon,
>or labeled non-inductive it may not necessarily be so in real life.
>
>Nearly ALL  carbon and metal film resistors have elements wound in a
>spiral, and the higher power resistors "fall apart" in the upper HF
>region. This is a huge problem in parasitic supressor design, and
>applications like yours.

This is absolutely correct, and in my previous post on this thread I
probably din't make it clear. Only in very low resistance values is the
film truly cylindrical. Usually, it is deposited that way and then
trimmed by burning a groove in it to increase the value. This
groove may be short, leaving the element mostly intact in some cases
but it all depends on the resistance per square of the film.

>
>You can cut the resistor open and look at the element, or measure it on a
>SWR analyzer to verify the quality of the component.

>Most companies order special resistors for RF load and attenuator
>applications. You will be better off using an array of small resistors, or
>ordering special components, than randomly using 2 or 5 watt components.
>The larger the component, the more likely it is you will run into this
>problem.

True again, which is why I too suggested paralleling a number of lower wattage
parts.  At least this way, if the parts are slightly inductive, they wind
up in parallel.

>
>73 Tom

73, Wes




From Unknown Wed Dec 13 14:38:14 1995
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!frankensun.altair.com!nntp.coast.net!news.kei.com!newsfeed.internetmci.com!in1.uu.net!noc.near.net!usenet.continental.com!usenet
From: "Paul Christensen, N9AZ" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Resistor for RF power attenuator help needed
Date: 11 Dec 1995 14:14:57 GMT
Organization: Continental Cablevision
Lines: 18
Message-ID: <4ahed1$[e-mail]>
References: <4a5dnf$[e-mail]> <4a9h15$[e-mail]>
NNTP-Posting-Host: 169.152.167.70
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)
To: [e-mail]

Tom:

So true.  It is getting increasingly difficult to find true, carbon
composition resistors anymore.  Fortunately, Allen-Bradley still
manufactures them in 1/8 watt up to 2 watt ratings.  Two models are
available: RC and RCR, and both are available in MIL-Spec versions.

As you indicated, even the best resistor can behave as an inductor at
high frequencies.

BTW, there is a form of wirewound resistor that's used extensively in
broadcast transmitters.  The return winding is crossed as it comes back
onto the resistor.  The idea here is to form a wirewound resistor with
inductance cancellation.  It's still not perfect, but works quite well in
high power applications.

-Paul, N9AZ



From Unknown Wed Dec 13 14:38:15 1995
Path: news.epix.net!news.sprintlink.net!malgudi.oar.net!gwis.com!uunet!in2.uu.net!newsfeed.internetmci.com!EU.net!peer-news.britain.eu.net!demon!mail2news.demon.co.uk!ifwtech.demon.co.uk
From: Ian G3SEK <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RF circuit simulator choice?
Date: Sun, 10 Dec 1995 00:33:24 +0000
Organization: IFWtech
Lines: 71
Message-ID: <[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: ifwtech.demon.co.uk
X-Newsreader: Newswin Alpha 0.9.1
X-SMTP-Posting-Host: ifwtech.demon.co.uk [Sun, 10 Dec 95 0:34:25 GMT]
X-SMTP-Posting-Host: post.demon.co.uk [Sun, 10 Dec 95 0:36:17 GMT]

In article: <[e-mail]>
[e-mail] (Peter L. Williamson) writes:
:
: Hello all,  I am having a great dilemma in finding a good (and RELATIVELY
: cheap) circuit simulation program for my RF (VHF to MICROWAVES) circuits.
: I have been using CALTECH'S PUFF which works OK but has a few too many
: liberties when analysing Microstrip circuits, particularly coupled
: filters.


If you're interested in modelling coupled-line filters, you need a physical
modelling program.

If that isn't your primary need, you might try SCALC as a general-purpose
VHF-microwave network simulator and optimizer. Please excuse the "canned"
description below.


****************

S-CALC is a powerful microwave S-parameter analysis and optimization
program that doesn't cost thousands of dollars. Developed by Roger
Blackwell, G4PMK and Ian White, G3SEK, the SCALC program can analyse the
performance of almost any RF network based on standard components and
building blocks. Unusually for a low-cost RF design program, SCALC has an
optimizer: starting from your initial design, it can automatically improve
the performance of the network towards your chosen goals.

As well as having a built-in circuit editor and its own large library of
active device data, SCALC can import your own device data in industry-
standard file formats (S2P and PUFF). Output from SCALC's performance
analyser can be in several formats including colour graphs, Smith charts
and tables of gain, impedance etc.

SCALC is easy to understand and use. When G4PMK and G3SEK developed SCALC
from the original program ALMOND by Chris Trask N7ZWY, they paid close
attention to the user interface and have also produced a comprehensive
manual with lots of explanation and tutorial examples. If you already know
a little about S-parameters, you can start to use SCALC very quickly
because the Shareware release includes the full tutorials and example
files. If you're still learning about RF design, SCALC and its tutorials
will help you on the way.

SCALC is Shareware with a specially low registration fee for radio
amateurs. The registered version also includes a printed manual, libraries
of device data and datafile conversion utilities, and technical support.

Requires VGA, 640k, DOS 3.2 or higher.


SCALC.ZIP (152505 bytes) is available by ftp from:

   scitsc.wlv.ac.uk /pub/hamradio/programs/g3sek+g4pmk

   demon.co.uk  /pub/ham/circuit-design

   oak.oakland.edu /pub/hamradio/pc/ham-utils

and also from the CompuServe HamNet library.

****************



--
73 from Ian G3SEK          Editor, 'The VHF/UHF DX Book'
                          'In Practice' columnist for RadCom (RSGB)
Professionally:
IFW Technical Services     Clear technical English - anywhere.



From Unknown Wed Dec 13 14:38:16 1995
Path: news.epix.net!news.sprintlink.net!news.dpc.net!news.heurikon.com!uwvax!uwm.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Peter L. Williamson)
Newsgroups: rec.radio.amateur.homebrew
Subject: RF circuit simulator choice?
Date: 8 Dec 95 19:56:26 GMT
Organization: ucsd usenet gateway
Lines: 17
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Hello all,  I am having a great dilemma in finding a good (and RELATIVELY
cheap) circuit simulation program for my RF (VHF to MICROWAVES) circuits.  I
have been using CALTECH'S PUFF which works OK but has a few too many
liberties when analysing Microstrip circuits, particularly coupled filters.
For low freq. work, I find MICROCAP (student edition ) terrific but it
doesn't do transmission lines.  I downloaded APLAC but the 14 MEGA bytes of
docs are horrendous, and are not easy to follow (very disjointed).  The best
I have seen and used would be ARRL's RADIO DESIGNER but it does not support
transmissio/microstrip lines ( A big mistake I feel as the rest is great and
the price is good at AUST$300) So far my best choice would be EAGLEWARE's
SUPERSTAR but at AUST$1500 + 50% import duty way out of an experimenters
pocket.   Any suggestions???
Does anyone have a earlier version of SUPERSTAR for sale that would fill my
needs ?? NO I AM NOT SUGGESTING YOU STEAL A COPY!!!!. I believe in fair
payment for good original software.
Back to you --- Best for Christmas Peter VK4AWP.



From Unknown Wed Dec 13 14:38:17 1995
Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!infoseek.com!uunet!in1.uu.net!newsfeed.internetmci.com!uwm.edu!math.ohio-state.edu!magnus.acs.ohio-state.edu!lerc.nasa.gov!purdue!haven.umd.edu!cs.umd.edu!coopnews.coop.net!news.den.mmc.com!news.vf.mmc.com!pitch!hbrown
From: [e-mail] (Harry H. Brown)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RF circuit simulator choice?
Date: 11 Dec 1995 17:29:51 GMT
Organization: Sun Microsystems
Lines: 16
Distribution: world
Message-ID: <4ahpqf$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: pitch.resd.vf.ge.com

Peter,

You may want to look into APLAC. A free demo version is available through the University of Helsinki in Finland. If yoy have WWW capability, you can find

The demo is almost unlimited in capability limited by a file size of 256 Kbytes. It is a circuit and systems symulator covering dc through microwaves. It

It is available in several versions including HP workstations, MS Windows, Sun, Solaris, Linux and DEC Alpha. The best thing is that it is free for the do

The document files are also downloadable. They are all zipped and expand into around 11 meg of postscript files. They require a postscript printer or a ut

The full commercial version goes for over $4000.


73, Harry, W3IIT




From Unknown Wed Dec 13 14:38:19 1995
Path: news.epix.net!news.sprintlink.net!clue.callamer.com!biggulp.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: sci.electronics,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc,de.comm.ham
Subject: Re: Serial-to-Parallel Converter
Date: Fri, 8 Dec 1995 14:23:39 -0800
Organization: CallAmerica, San Luis Obispo CA USA
Lines: 26
Message-ID: <[e-mail]>
References: <4a383p$a74$[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: biggulp.callamer.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
NNTP-Posting-User: cbuttsch
In-Reply-To: <[e-mail]>
Xref: news.epix.net sci.electronics:161667 rec.radio.amateur.misc:95294 rec.radio.amateur.homebrew:11976 rec.radio.amateur.digital.misc:13004 de.comm.ham:2508

Good lord...A CMOS UART with independant receive and transmit clocks is
less than five bucks!!!   73   Cliff   W6HDO

On Thu, 7 Dec 1995, Rob Janssen wrote:

> In <[e-mail]> Don Rotolo <[e-mail]> writes:
>
>
> >In article <4a383p$a74$[e-mail]>,
> >> I'm trying to find either an IC or a schematic for converting
> >> serial-parallel.
>
> >Brian,
> >Don't bother building one when you can buy one - about $90 from
> >Global Computer Supplies 800-845-6225.
>
> Is this today's way of dealing with homebrewers?  I'm baffled...
>
> Rob
> --
> +------------------------------------+--------------------------------------+
> | Rob Janssen         [e-mail] | BBS: [phone] (2300-0730 local) |
> | AMPRnet:       [e-mail] | AX.25 BBS: PE1CHL@PI8WNO.#UTR.NLD.EU |
> +------------------------------------+--------------------------------------+
>
>


From Unknown Wed Dec 13 14:38:20 1995
Path: news.epix.net!news.sprintlink.net!clue.callamer.com!biggulp.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: de.comm.ham,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew,rec.radio.amateur.misc,sci.electronics
Subject: Re: Serial-to-Parallel Converter
Date: Sun, 10 Dec 1995 10:14:16 -0800
Organization: CallAmerica, San Luis Obispo CA USA
Lines: 46
Message-ID: <[e-mail]>
References: <4a383p$a74$[e-mail]> <4ad2m2$[e-mail]>
NNTP-Posting-Host: biggulp.callamer.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
NNTP-Posting-User: cbuttsch
In-Reply-To: <4ad2m2$[e-mail]>
Xref: news.epix.net de.comm.ham:2514 rec.radio.amateur.digital.misc:13016 rec.radio.amateur.homebrew:12006 rec.radio.amateur.misc:95338 sci.electronics:161784

The older STAR and OKIDATA five by seven printers almost always had
serial port inputs.  They usually can be gotten as a gift!!  Cliff W6HDO


On 9 Dec 1995, John Lundgren wrote:

> Brian Webb ([e-mail]) penned:
> : I'm trying to find either an IC or a schematic for converting
> : serial-parallel.
>
> : I own a solid state radioteletype decoder (circa 1980) designed
> : to work with serial printers. However, my printer, like virtually
> : all others is parallel.
>
> : Regards,
> : Brian Webb, KD6NRP
>
> Most printers around that time were serial.  There are still many old
> printers that are serial.  And believe it or not, most of the printers
> made today are serial.
>
> Well that's a bit of a fib.  Most of the printers, like LaserJets and
> DeskJets, have both serial and parallel ports.  And you could use either
> one on the newer models.  They switch automatically between the two ports.
>
> The computer stores like Fry's and MicroCenter sell a serial to parallel
> box for around $40 US.  You can often pick up a cheap buffer box that
> will do the same for a few dollars at a swap meet.
>
> You should check to make sure that the box you get can be set to the correct
> baud rate.  Some of the older stuff may run at very low baud rates, and
> most stuff today runs at 1200 bps or faster.
>
> --
> #===================================================================#
> |    John Lundgren - Elec Tech - Info Tech Svcs. | jlundgre@delta1  |
> |       Rancho Santiago Community College        | .deltanet.com    |
> |    17th St @ Bristol \ Santa Ana, CA 92706     |                  |
> | My opinions are my own, and not my employer's. |                  |
> |      "You can flame your brains out -- it won't take long."       |
> |         I have gone out to look for myself..  If I should         |
> |        return before I get back, hold me until I get here.        |
> #======P=G=P==k=e=y==a=v=a=i=l=a=b=l=e==u=p=o=n==r=e=q=u=e=s=t======#
>
>
>


From Unknown Wed Dec 13 14:38:21 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!news.mathworks.com!zombie.ncsc.mil!nntp.coast.net!news00.sunet.se!sunic!news99.sunet.se!columba.udac.uu.se!news.mdh.se!news.seinf.abb.se!erinews.ericsson.se!portia!emwhkj
From: [e-mail] (Henrik Johnsson)
Newsgroups: sci.electronics,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc,de.comm.ham
Subject: Re: Serial-to-Parallel Converter
Followup-To: sci.electronics,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc,de.comm.ham
Date: 13 Dec 1995 09:52:25 GMT
Organization: Ericsson Microwave Systems AB
Lines: 26
Message-ID: <4am7op$[e-mail]>
References: <4a383p$a74$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: portia.emw.ericsson.se
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Xref: news.epix.net sci.electronics:162181 rec.radio.amateur.misc:95492 rec.radio.amateur.homebrew:12095 rec.radio.amateur.digital.misc:13066 de.comm.ham:2531

Rick Farmer ([e-mail]) wrote:
> >>In article <4a383p$a74$[e-mail]>,
> >>> I'm trying to find either an IC or a schematic for converting
> >>> serial-parallel.
>
>  Sorry I missed the fornt end of this thread, so I don't know exaclty what you
> need but the 74xx299 is a 20 pin parallel in and out universal 8 bit shift
> reg. It should do the trick.
[snip]
> Rick Farmer             |  Ratio DesignLab
> Electrical Engineer     |  3040 Peachtree Rd.
> [e-mail]          |  Atlanta, Ga. 30305 USA
It would most definitely not do the trick, at least not without large
amounts of support logic. The original post was about asynchronous
serial transfer. It can be done with the HD6402 as mentioned, but it
will take a few extra chips to go along. A microcontroller with onboard
PROM would probably give the lowest chip count, but you need some tools
that not everyone has available (compiler/assembler, device programmer).

/Henrik
--
    _/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
   _/ Ericsson Microwave Systems AB          _/
  _/ Henrik Johnsson [e-mail] _/
 _/ tel [phone], fax [phone]   _/
_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/


From Unknown Wed Dec 13 14:38:22 1995
Path: news.epix.net!uunet!in1.uu.net!matlock.mindspring.com!rfarmer.mindspring.com!rfarmer
From: [e-mail] (Rick Farmer)
Newsgroups: sci.electronics,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc,de.comm.ham
Subject: Re: Serial-to-Parallel Converter
Date: Tue, 12 Dec 1995 22:51:00 -0400
Organization: MindSpring Enterprises, Inc.
Lines: 14
Message-ID: <[e-mail]>
References: <4a383p$a74$[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: rfarmer.mindspring.com
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B]
Xref: news.epix.net sci.electronics:162192 rec.radio.amateur.misc:95498 rec.radio.amateur.homebrew:12097 rec.radio.amateur.digital.misc:13069 de.comm.ham:2532

>>In article <4a383p$a74$[e-mail]>,
>>> I'm trying to find either an IC or a schematic for converting
>>> serial-parallel.

 Sorry I missed the fornt end of this thread, so I don't know exaclty what you
need but the 74xx299 is a 20 pin parallel in and out universal 8 bit shift
reg. It should do the trick. Tons of other options as usual. Since your going
to have to write a driver, you might want to use a microcontroller with a
serial port to make you box look like some other modern device that is
supported by whatever software is going to be talking to it.

Rick Farmer             |  Ratio DesignLab
Electrical Engineer     |  3040 Peachtree Rd.
[e-mail]          |  Atlanta, Ga. 30305 USA


From Unknown Wed Dec 13 14:38:23 1995
Path: news.epix.net!news.sprintlink.net!gatech2!swrinde!howland.reston.ans.net!Germany.EU.net!Dortmund.Germany.EU.net!Uni-Dortmund.DE!thorsten
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: SMALL HV capacitors ?
Date: 11 Dec 1995 09:20:19 GMT
Organization: University of Dortmund, Germany
Lines: 11
Message-ID: <4agt4j$[e-mail]>
NNTP-Posting-Host: fuj.physik.uni-dortmund.de
X-Newsreader: TIN [version 1.2 PL2]

Hi!

I'm searching for HV (200...1000V) capacitors with dimensions in the
some-millimeters-range. Tunable ones would be best, but are not
essential...

Thanks for infos,

Thorsten Feiweier

[e-mail]


From Unknown Wed Dec 13 14:38:24 1995
Path: news.epix.net!news.sprintlink.net!gate.net!news-adm
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: SMALL HV capacitors ?
Date: 11 Dec 1995 14:57:56 GMT
Organization: CyberGate, Inc.
Lines: 14
Message-ID: <4ahgtk$[e-mail]>
References: <4agt4j$[e-mail]>
NNTP-Posting-Host: ftmfl2-50.gate.net
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

>   [e-mail] () writes:

>  I'm searching for HV (200...1000V) capacitors with dimensions in the
>  some-millimeters-range. Tunable ones would be best, but are not
>  essential...

I don't have my ARRL book here, but coax makes a great capacitor. Look in the tables and find out the capacitance per foot and
measure and cut the appropriate length.

I have also made "trombone" capicitors with brass tubing inside and outside plastic tubing.

THe advantage of the coax capicitor is that the power handling capabilities are known.

Hope this helps, Mike "777" KF4FDJ


From Unknown Wed Dec 13 14:38:25 1995
Path: news.epix.net!news.sprintlink.net!news.bluesky.net!solaris.cc.vt.edu!newsfeed.internetmci.com!in2.uu.net!peach!root
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew,rec.radio.scanner,rec.radio.swap
Subject: Re: TRADE UP TO 42MB OF RAM FOR ?? VHF/UHF EQ
Date: Fri, 08 Dec 95 17:33:33 GMT
Organization: Access America, P.O. Box 1222, Alpharetta, GA 30239-1222
Lines: 15
Message-ID: <[e-mail]>
References: <49rbk0$32l$[e-mail]>
 <49re0b$[e-mail]>
NNTP-Posting-Host: pm1-14.america.net
X-Newsreader: Quarterdeck Message Center [1.0]
Xref: news.epix.net rec.radio.amateur.homebrew:11992 rec.radio.scanner:41719 rec.radio.swap:52601


> THATS ALL THE MEMORY I OWN AND ITS MOSTLY 72PIN 70NS OR FASTER. I WILL
> CONSIDER ANY AND ALL TRADES FOR CLEAN AND WORKING
> EQUIPMENT.(2M,440,220,SCANNERS,ECT...)
>
> KELVIN
>
> KE6CRK

----I will trade you for the ram I have a Icom IC-2st  HT  2m  with drop
charger.
[e-mail]





From Unknown Wed Dec 13 14:38:26 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!sdd.hp.com!col.hp.com!news.dtc.hp.com!hpscit.sc.hp.com!rkarlqu
From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Varicap temperature compensation?
Date: 11 Dec 1995 15:46:55 GMT
Organization: Hewlett-Packard
Lines: 27
Message-ID: <4ahjpf$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: hpscrj.scd.hp.com

In article <[e-mail]>,
John Seboldt <[e-mail]> wrote:
>I remember someone posting here or somewhere the Motorola recommendations
>for temperature compensating a varicap diode.  It follows the wisdom seen
>in the DeMaw homebrew books (a series diode in the tuning voltage leg),
>with more refinements, like a shunt resistor somewhere.  Help!
>
>: John Seboldt  [e-mail]  / CW:  It don't mean a thing
>:      K0JD... Minneapolis, MN      /  if it ain't got that swing!
>:   My R2/T2 station described in  / Di dah, di dah, di dah, di dah...
>> http://www.lehigh.edu/lists/qrp-l/k0jd/index.html <
>

I just reread Motorola's application note on temperature effects
on varicaps, but didn't find it very enlightening.  It had a
bunch of random data of tempco of various varactors at various temperatures,
but no unified theory of compensation except for mentioning in passing
the 2mv/deg C compensation by using an auxiliary diode with DC bias on
it to give a variable offset that you alluded to.

If anyone has any other info in this area, I would greatly appreciate
hearing about it.  If not, I am going to have to conduct my own study
here at HP pretty soon for a project I am working on.

Rick Karlquist N6RK
[e-mail]



From Unknown Wed Dec 13 14:38:27 1995
Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!bug.rahul.net!a2i!sierra.net!squaw-d103.sierra.net!user
From: [e-mail] (Bob T.)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Varicap temperature compensation?
Date: Tue, 12 Dec 1995 03:26:07 -0800
Organization: Engineered Solutions
Lines: 17
Message-ID: <[e-mail]>
References: <[e-mail]> <4ahjpf$[e-mail]>
NNTP-Posting-Host: squaw-d103.sierra.net

Snip
Snip
The 95 handbook published a neat adjustable tempco compensation circuit
that should be adaptable to nearly any application with oscillators.

It consists of a bridge circuit that has a thermistor in each leg, one up
and one down, a trimpot whose wiper is connected to the source voltage for
initial balancing, and a 100K multi-turn pot across the bridge whose wiper
is connected to a varicap diode used to offset the drift of another LC or
crystal oscillator.  It is in the AC sources/oscillators section.  Sorry I
can't give page and actual verse, but I am using it quite happily.  Very
adjustable.

E-mail me what file format you can use and I will send you the schematic
of its application in my "stuff."

Bob Tetrault


From Unknown Wed Dec 13 14:38:28 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!jazz!butch
From: [e-mail] (' ALLAN W. BART)
Subject: Re: VLF detector?
Message-ID: <[e-mail]>
Organization: Maestro Technologies, Inc
X-Newsreader: TIN [version 1.2 PL0]
References: <4a47cp$[e-mail]> <4a7gfo$[e-mail]>
Date: Sun, 10 Dec 1995 20:11:37 GMT
Lines: 13





Rich , if you could email me perhaps i could provide some assistance in
locating what you are looking for.


allan Rick Gerson (rgerson) wrote:
: I am interested in this, so if you have found any inf, please let me know--
: I have not the faintest idea where to start.
: rick.



From Unknown Wed Dec 13 14:38:29 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!newsfeed.internetmci.com!info.ucla.edu!galaxy.ucr.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Paul Erickson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Voice Keyers?
Date: 10 Dec 95 23:56:13 GMT
Organization: ucsd usenet gateway
Lines: 7
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

I would appreciate hearing any experiences people have had building
voice keyers.

cheers, Paul
VE7CQK
email: [e-mail]



From Unknown Wed Dec 13 14:38:30 1995
Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!rfarmer.mindspring.com!rfarmer
From: [e-mail] (Rick Farmer)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Voice via Light?
Date: Mon, 11 Dec 1995 21:08:00 -0400
Organization: MindSpring Enterprises, Inc.
Lines: 21
Message-ID: <[e-mail]>
References: <49l0a6$[e-mail]> <49r07e$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
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In article <[e-mail]> Clifford Buttschardt <[e-mail]> writes:

]Rick I have not gotten your meaning!  All well and good that 68HX05J1 sell
]for $1.60.  What does that have to do with the problem, $500 multipurpose
]programmers not withstanding!  really I do not give a hoot that Motorola
]sold one billion microcontrollers.  I want one that works for all of us!!

 I get your point. I was trying to point out how often a uC can make short
work of many of the common task the average hobbist is trying to solve, not
just professional EEs. If you just want to play around and have some fun get a
PIC 16c84 for $10 US. Its EEPROM so you can erase and reuse it and the
schematics for a home brew PC serial port based programmer are on the net.
Total cost $20 and a weekend of your time. Digital and uCs and uPs in
particular seem to be seen as overwhelming by the average ham. Kind of like RF
is magic to the average guy. Actually digiatal is easier. I can write a
reasonable complicated program for my favorite uC in a few beers and have it
compile right off the bat. Now designing a 418 MHz 50 ohm 3.5 inch strip line
folded dipole antenna is a lot of work.
Rick Farmer             |  Ratio DesignLab
Electrical Engineer     |  3040 Peachtree Rd.
[e-mail]          |  Atlanta, Ga. 30305 USA


From Unknown Wed Dec 13 14:38:31 1995
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From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Voice via Light?
Date: 12 Dec 1995 04:06:29 GMT
Organization: Edmonton Freenet, Edmonton, Alberta, Canada
Lines: 29
Message-ID: <4aiv45$[e-mail]>
References: <49l0a6$[e-mail]> <49r07e$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
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X-Newsreader: TIN [version 1.2 PL2.3]

Rick Farmer ([e-mail]) wrote:
: In article <[e-mail]> Clifford Buttschardt <[e-mail]> writes:

: ]Rick I have not gotten your meaning!  All well and good that 68HX05J1 sell
: ]for $1.60.  What does that have to do with the problem, $500 multipurpose
: ]programmers not withstanding!  really I do not give a hoot that Motorola
: ]sold one billion microcontrollers.  I want one that works for all of us!!

:  I get your point. I was trying to point out how often a uC can make short
: work of many of the common task the average hobbist is trying to solve, not
: just professional EEs. If you just want to play around and have some fun get a
: PIC 16c84 for $10 US. Its EEPROM so you can erase and reuse it and the
: schematics for a home brew PC serial port based programmer are on the net.
: Total cost $20 and a weekend of your time. Digital and uCs and uPs in
: particular seem to be seen as overwhelming by the average ham. Kind of like RF
: is magic to the average guy. Actually digiatal is easier. I can write a
: reasonable complicated program for my favorite uC in a few beers and have it
: compile right off the bat. Now designing a 418 MHz 50 ohm 3.5 inch strip line
: folded dipole antenna is a lot of work.

Where can I find a schematic for that serial port programmer? I have a
friend that would be very interested in something like that. Thanx

--
73 & ttyl     Morgan Patterson
       \\///  Internet: [e-mail]
       (o o)  Ham Radio: VE6MRP
        (_)   "Ok, take your best shot. Aim well: I don't die easy"
----oOO-----OOo---------------------------------------------------------------


From Unknown Wed Dec 13 14:38:32 1995
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From: [e-mail] (Tim Hynde ka8ddz/qrp Rochester, MI )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Voice via Light?
Date: 12 Dec 1995 03:23:46 GMT
Organization: Netcom
Lines: 4
Message-ID: <4aisk2$[e-mail]>
References: <49l0a6$[e-mail]> <49r07e$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: ix-pon-mi4-17.ix.netcom.com
X-NETCOM-Date: Mon Dec 11  7:23:46 PM PST 1995

No financial connection, but I see that RAMSEY has just such a kit
and claims they xmit voice up to 30ft w/o lenses.

Tim


From Unknown Wed Dec 13 14:38:33 1995
Path: news.epix.net!news.sprintlink.net!oronet!news
From: [e-mail] (Jim Weir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Voice via Light?
Date: Tue, 12 Dec 1995 18:35:10 GMT
Organization: RST Engineering
Lines: 19
Message-ID: <4aki0s$[e-mail]>
References: <49l0a6$[e-mail]> <49r07e$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: rst-engr.oro.net
X-Newsreader: Forte Free Agent 1.0.82

 Now designing a 418 MHz 50 ohm 3.5 inch strip line
>folded dipole antenna is a lot of work.
>Rick Farmer             |  Ratio DesignLab

Naaah.  Piece of cake.  Want it in G10 or Teflon?  Wanna see the
design in five seconds?

Wanna see it again?

Jim



Jim Weir VP Engineering  | "We seem to be standing on
RST Engineering          |  the foreskin of technology."
Grass Valley CA 95945    | (Gen Chuck Yeager)
voice/fax [phone]   |
[e-mail]  AR Adv WB6BHI  CFI A&G/Comml Inst A&G/A&P/C-182A N73CQ



From Unknown Wed Dec 13 14:38:34 1995
Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!rfarmer.mindspring.com!rfarmer
From: [e-mail] (Rick Farmer)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Voice via Light?
Date: Tue, 12 Dec 1995 22:39:17 -0400
Organization: MindSpring Enterprises, Inc.
Lines: 18
Message-ID: <[e-mail]>
References: <49l0a6$[e-mail]> <49r07e$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
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In article <4aki0s$[e-mail]> [e-mail] (Jim Weir) writes:

]] Now designing a 418 MHz 50 ohm 3.5 inch strip line
]]folded dipole antenna is a lot of work.
]]Rick Farmer             |  Ratio DesignLab

]Naaah.  Piece of cake.  Want it in G10 or Teflon?  Wanna see the
]design in five seconds?

 Alright, I guess its my turn to take a few lumps ;). Actually its going up
the side of a mixed signal board made of FR4. I dove into a heavy duty antenna
text and decided I'd better layout a pad for a 1206 loading coil on the input
and a pad for a similar loading cap to ground at the end and tweak it on the
bench. BTW Jim if your feeling charitable, the separation is 100 mil (space is
tight). Digital Dude bows humbly in the presence of Wavy One.
Rick Farmer             |  Ratio DesignLab
Electrical Engineer     |  3040 Peachtree Rd.
[e-mail]          |  Atlanta, Ga. 30305 USA


From Unknown Wed Dec 13 14:38:35 1995
Path: news.epix.net!news.sprintlink.net!service-2.bluefin.net!usenet
From: [e-mail] (Peter LePage / KD1XZ)
Newsgroups: rec.radio.amateur.homebrew
Subject: Wanted: DTMF Decoder Suppliers
Date: 12 Dec 1995 01:57:41 GMT
Organization: Blue Fin Systems, Inc.
Lines: 18
Message-ID: <4ainil$[e-mail]>
NNTP-Posting-Host: pol.bluefin.net
X-Newsreader: WinVN NT 0.92.6

I'm looking for suppliers of a DTMF decoder IC. Part numbers
SSI202P or 75T202 or CD22202E.

JDR Microdevices reportedly carries these, however the phone
number I have for them rings through to a fax. Does anyone have a voice
line to JDR?

I also tried Digikey...Their WWW page reported that they carried CD22202E,
however, after talking with them on the phone, they do not carry them in
stock.

I'm looking for a small quanity (4-6 parts) to start.

Any help would be appreciated, please post here or email me direct.

Thanks,

Peter / KD1XZ


From Unknown Wed Dec 13 14:38:36 1995
Path: news.epix.net!uunet!in1.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!ferrari.mst6.lanl.gov!newshost.lanl.gov!usenet
From: Jim Devenport <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Wanted: DTMF Decoder Suppliers
Date: 12 Dec 1995 19:55:46 GMT
Organization: Los Alamos National Laboratory
Lines: 21
Message-ID: <4akmo2$[e-mail]>
References: <4ainil$[e-mail]>
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Mime-Version: 1.0
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To: [e-mail]


Try :

B.G. Micro
PO Box 280298
Dallas TX 75228
Orders 800-276-2206
fax [phone]
email [e-mail]

No min. order
No connection to me (except I bought a dozen of these exact
IC's from them several months ago).
SSI-202 listed on p. 4 of recent flyer for $2.25 ea.
--
*********** Jim Devenport WB5AOX **************
*      PO Box 445, McIntosh NM 87032          *
*        http://nis-www.lanl.gov/~jdport/     *
***********************************************




From Unknown Wed Dec 13 14:38:37 1995
Path: news.epix.net!news.sprintlink.net!nuclear.microserve.net!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Waste of Money?
Date: Tue, 12 Dec 95 05:31:29 GMT
Organization: Microserve Information Systems (800)-380-INET
Lines: 10
Distribution: world
Message-ID: <4akelq$[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

I've always read that steel can't be used for transformer cores at RF
because its loss is prohibitive at higher frequencies.  However, when
a cable is wound around a ferrite rod or through a toroid for purposes
of RFI prevention, it shouldn't matter whether the core is reactive or
resistive.  Is it a waste of money to use ferrites for this, or does
plain steel "disappear" at RF due to hysteresis?


73,
Jack  WB3U


From Unknown Wed Dec 13 14:38:38 1995
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From: [e-mail] (Steve Muther)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: What's at 1420 MHz????
Date: 8 Dec 1995 23:20:51 GMT
Organization: Stanford Amateur Radio Club
Lines: 18
Message-ID: <4aah8j$[e-mail]>
References: <4a81ie$[e-mail]>
NNTP-Posting-Host: w6yx.stanford.edu

In article <4a81ie$[e-mail]> [e-mail] (Pieter Ibelings) writes:
>I got my copy of Feed Point yesterday and there is a list of noise figure
>results. One of the frequencies where tests were conducted is 1420 MHz.
>Why 1420 MHz? Also has anyone heard of a NASA beacon that was left at the
>moon around 2.4 GHz?
>
>73's
>Pieter Ibelings
>AC4OP
>

The Apollo 16 mission (I think) left behind an array of scientific
instruments on the moon which transmitted telemetry somewhere near
2.8GHz. I think it was shut off a long time ago due to lack of funding
to analyze the data.

Steve M.



From Unknown Wed Dec 13 14:38:39 1995
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From: [e-mail] (Steve Muther)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: What's at 1420 MHz????
Date: 9 Dec 1995 05:03:53 GMT
Organization: Stanford Amateur Radio Club
Lines: 15
Message-ID: <4ab5bp$[e-mail]>
References: <4a81ie$[e-mail]> <4a8jhd$[e-mail]>
NNTP-Posting-Host: w6yx.stanford.edu

In article <4a8jhd$[e-mail]> "Charles W. Doolittle-Scovish" <[e-mail]> writes:
>1420 MHZ   =  first harmonic of water.    Microwaves operate near there.
>--
>Charles W. Doolittle-Scovish
>[e-mail]   [e-mail]
>N1SPX
>Frequencies at http://acm.rpi.edu/~n1spx
>
 Actually, most microwave ovens operate at 2450MHz (right at the top of our
 ham band).

 Steve Muther WF6R





From Unknown Wed Dec 13 14:38:39 1995
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From: [e-mail] (J. L. Blanton)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: What's at 1420 MHz????
Date: Sat, 09 Dec 1995 00:29:41 -0800
Organization: Network Intensive
Lines: 14
Message-ID: <[e-mail]>
References: <4a81ie$[e-mail]>
NNTP-Posting-Host: xband.ni.net

In article <4a81ie$[e-mail]>, [e-mail]
(Pieter Ibelings) wrote:

> I got my copy of Feed Point yesterday and there is a list of noise figure
> results. One of the frequencies where tests were conducted is 1420 MHz.
> Why 1420 MHz?

1420 MHz is an emission line of neutral hydrogen.  It is used by radio
astronomers to map hydrogen density in the Milky Way galaxy and beyond.  A
small frequency band surrounding 1420 MHz is a protected radio astronomy
frequency and no other manmade emissions are permitted there.

Lee, WA8YBT/6
Temecula, CA


From Unknown Wed Dec 13 14:38:41 1995
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From: [e-mail] (Mike Keitz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: What's at 1420 MHz????
Date: Sat, 09 Dec 95 07:27:11 GMT
Organization: TSE Systems
Lines: 36
Message-ID: <4abdf7$[e-mail]>
References: <4a81ie$[e-mail]> <4a8jhd$[e-mail]> <4ab5bp$[e-mail]>
NNTP-Posting-Host: mkeitz.beve.blacksburg.va.us
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In article <4ab5bp$[e-mail]>,
   [e-mail] (Steve Muther) wrote:
>In article <4a8jhd$[e-mail]> "Charles W. Doolittle-Scovish"
<[e-mail]> writes:
>>1420 MHZ   =  first harmonic of water.    Microwaves operate near there.
>>--
>>Charles W. Doolittle-Scovish
>>[e-mail]   [e-mail]
>>N1SPX
>>Frequencies at http://acm.rpi.edu/~n1spx
>>
> Actually, most microwave ovens operate at 2450MHz (right at the top of
our
> ham band).

More like all over the band.  The signal is about 25 MHz wide.  If it's any
consolation, it's only on half of the time.  The power supply in the oven
is a half-wave voltage doubler, so the magnetron doesn't operate during one
half-cycle of the power line.  This varying, unfiltered power causes the
mangetron frequency to FM all over the place though.  In very limited
research (sample size of 2), the ERP from a typical closed, apparently
properly maintained oven was about 1 Watt peak.  Doesn't look like the
commercial communication interests are going to want to take over *that*
band anytime soon!

As I understand it, the frequency chosen doesn't have to have anything to
do with resonance of water molecules.  It's the current induced by the
waves due to resistance and/or dielectric loss in the food or drink that
cause the heating effect.  For example, the metallized lining in a
microwave popcorn bag will absorb the microwave energy and heat up the fat
inside the bag, which transfers heat to the corn to pop it.  No water is
involved other than that in the corn kernels, and that is heated
indirectly.

-Mike KD4QDM



From Unknown Wed Dec 13 14:38:42 1995
Path: news.epix.net!news.sprintlink.net!news.ahc.ameritech.com!ddsw1!news.mcs.net!chi-news.cic.net!nntp.coast.net!news00.sunet.se!sunic!news99.sunet.se!news.funet.fi!news.cc.tut.fi!proffa.cc.tut.fi!not-for-mail
From: [e-mail] (Kein{nen Paul)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: What's at 1420 MHz????
Date: 11 Dec 1995 10:25:37 +0200
Organization: Tampere University of Technology
Lines: 38
Distribution: world
Message-ID: <4agpu1$[e-mail]>
References: <4a81ie$[e-mail]>
NNTP-Posting-Host: proffa.cc.tut.fi


Pieter Ibelings ([e-mail]) wrote:

> I got my copy of Feed Point yesterday and there is a list of noise figure
> results. One of the frequencies where tests were conducted is 1420 MHz.
> Why 1420 MHz?

It is the 21 cm spectral line from interstellar hydrogen. It is produced
from spin reversals of the only electron in a hydrogen atom.

What was the noise figure quoted and from which direction was that
measurement obtained ? There are large variations in the 21 cm emission,
while most radiation comes from the Milky Way.

Another well known spectral line is the hydroxyl (OH-) spectral
line at 18 cm (1667 MHz).

> Organization: -.-. --.-     -.. -..-

The ultimate CQ DX was attempted by the SETI (Search for ExtraTerrestrial
Intelligence) people who transmitted simple "pictures" at 21 cm towards
some nearby stars, hoping for a reply from some intelligent creatures
that were hoped to live near these stars :-).

IMHO, the high noise 21 cm spectral line is the worst place for such
experiments.

> Also has anyone heard of a NASA beacon that was left at the
> moon around 2.4 GHz?

Is this the transmitter that was in in the ALSEP scientific station
that was left on the moon by the Apollo astronauts ? The SNAP nuclear
batteries that powered these stations have depleted long ago, so I doubt
that there are any more operationals beacons.


                Paul OH3LWR



From Unknown Wed Dec 13 14:38:43 1995
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From: [e-mail] (Tom Clarke)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: What's at 1420 MHz????
Date: 11 Dec 1995 11:59:06 -0500
Organization: University of Central Florida
Lines: 18
Message-ID: <4aho0q$[e-mail]>
References: <4a81ie$[e-mail]> <4a8jhd$[e-mail]>  <4ab5bp$[e-mail]> <4abdf7$[e-mail]>
NNTP-Posting-Host: longwood.cs.ucf.edu

If I remember my astronomy classes, 1420 MHz is the spin flip
frequency of the hydrogen atom.  Radio astronmers use it to
map the distribution of hydrogen in space.  Digging deeper the
OH radical has a radio line at 1680 MHz(?) so that the region
between 1420 and 1680 has come to be called the water hole
(H to OH) by those who SETI (Search for Extraterrestrial
Intelligence).  Presumably any life forms will know water
and think this frequency range as nice a pun as we do.
Sort of an intergalacitic calling channel.   Also
I think the galactic radio noise has a minimum in this
general frequency range.

Tom Clarke

--
  People of the same trade seldom meet together, even for merriment
  and diversion, but the conversation ends in a conspiracy against
  the public, or in some contrivance to raise prices - Adam Smith, WofN


From Unknown Wed Dec 13 14:38:44 1995
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From: Zack Lau <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: What's at 1420 MHz????
Date: Mon, 11 Dec 1995 09:11:13 -0800
Organization: American Radio Relay League
Lines: 15
Message-ID: <[e-mail]>
References: <4a81ie$[e-mail]> <4a8jhd$[e-mail]>
NNTP-Posting-Host: mgate.arrl.org
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b3 (Win16; I)
To: "Charles W. Doolittle-Scovish" <[e-mail]>

Charles W. Doolittle-Scovish wrote:
>
> 1420 MHZ   =  first harmonic of water.    Microwaves operate near there.
If you are referring to microwave ovens, they used to operate
around 900 MHz, and then were moved to 2.45 GHz.  The frequency
of a microwave oven has *nothing* to do with any water resonance
frequency.  It has a lot more to do with the politics of spectrum
allocation, and secondarily, the physics needed to make a safe and
useful cooking tool.

Fortunately for those searching for extra-terrestial intelligence
(SETI), microwave ovens don't operate near the water hole (1420
to 1660 MHz).

Zack Lau  KH6CP/1  [e-mail]


From Unknown Wed Dec 13 14:38:45 1995
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From: Poltergeist <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: WNTD: Circuit for 1750hz ToneBurst
Date: Sun, 10 Dec 95 19:13:28 GMT
Organization: G7KGT (King of God's Turkeys)
Lines: 15
Message-ID: <[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: roogna.demon.co.uk
X-Newsreader: Demon Internet Simple News v1.29
X-SMTP-Posting-Host: roogna.demon.co.uk [Mon, 11 Dec 95 1:37:52 GMT]
X-SMTP-Posting-Host: post.demon.co.uk [Mon, 11 Dec 95 1:39:36 GMT]

Hi There.

Can anyone supply me with a diagram for a small reliable 1750hz tone burst??
I want to fit it between a Speaker/Mike and a PMR, hence it must be small,
battery operated (abt 1.5volts) and push button operated.

Thanks for reading this and in advance for all replies.

Roy G7KGT

[e-mail]

or active on 433.025 (rb1) in the Manchester UK area.



From Unknown Wed Dec 13 14:38:46 1995
Path: news.epix.net!news.sprintlink.net!news.magicnet.net!news.supernet.net!usenet.eel.ufl.edu!gatech2!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WNTD: Circuit for 1750hz ToneBurst
Date: 11 Dec 95 17:03:00 GMT
Organization: ucsd usenet gateway
Lines: 25
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Roy G7KGT asks:

> Can anyone supply me with a diagram for a small reliable 1750Hz
> tone burst??

This is a fairly tough assignment, since you need 1750 Hz +/- 1% over
a wide temperature range. Check out the material in the RSGB VHF/UHF
manual, and the Radio Communication Handbook.

What I did when I needed a toneburst for a trip to England was make a
TTL crystal oscillator with a 7400 and a 3.58 MHz NTSC colour-burst
crystal, divide it by 2048 with a handful of 7493s, and apply the
result (slightly below 1748 Hz) to a little speaker. Worked perfectly
the first try, and being based entirely on junkbox components, cost me
exactly nothing. A more concise version might use one of those nifty
CMOS ripple counters for the division by 2**11.

Such a concoction - even with CMOS - is unlikely to run on 1.5V,
unfortunately...

Laura Halliday VE7LDH         "C'est une femme mutine, assez
                               elegante, grave et legere, ayant
[e-mail]           le sens du confort et du plaisir
[e-mail]               en tout." - C. Deneuve



From Unknown Wed Dec 13 14:38:47 1995
Path: news.epix.net!news.sprintlink.net!clue.callamer.com!biggulp.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WTB: Butterfly Mica Trim Caps, about 90 [e-mail]
Date: Tue, 12 Dec 1995 17:53:19 -0800
Organization: CallAmerica, San Luis Obispo CA USA
Lines: 14
Message-ID: <[e-mail]>
References: <4akt92$[e-mail]>
NNTP-Posting-Host: biggulp.callamer.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
NNTP-Posting-User: cbuttsch
In-Reply-To: <4akt92$[e-mail]>

Compression mica caps are available in values much larger than 50 pf, in
fact many up to 1000 pf although they get rather bulky at larger values.
Check ARCO for this sort of cap in major mail order houses.  Cliff  W6HDO

On 12 Dec 1995, Gary Borich wrote:

> These are the type of trim caps that screw a metal plate down on another
> plate separated by a thin sheet of mica, called "butterfly" caps.  They
> are common up to about 49 pf, but I'm looking for some larger.  E-mail
> me direct.
>
>
>
>


From Unknown Wed Dec 13 14:38:48 1995
Path: news.epix.net!uunet!in2.uu.net!cs.utexas.edu!geraldo.cc.utexas.edu!usenet
From: Gary Borich <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: WTB: Butterfly Mica Trim Caps, about 90 [e-mail]
Date: 12 Dec 1995 21:47:14 GMT
Organization: The University of Texas at Austin
Lines: 6
Message-ID: <4akt92$[e-mail]>
NNTP-Posting-Host: edb506m.edb.utexas.edu
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Macintosh; I; 68K)
X-URL: news:rec.radio.amateur.homebrew

These are the type of trim caps that screw a metal plate down on another
plate separated by a thin sheet of mica, called "butterfly" caps.  They
are common up to about 49 pf, but I'm looking for some larger.  E-mail
me direct.




From Unknown Wed Dec 13 14:38:49 1995
Path: news.epix.net!uunet!in2.uu.net!news.ultranet.com!bigboote.WPI.EDU!news3.near.net!yale!news-mail-gateway!daemon
From: [e-mail] (Steve Schiller)
Newsgroups: rec.radio.amateur.homebrew
Subject: WTB: Slotted Line
Date: 12 Dec 1995 16:36:09 -0500
Organization: Yale CS Mail/News Gateway
Lines: 17
Sender: [e-mail]
Message-ID: <[e-mail]>
NNTP-Posting-Host: babyblue.cs.yale.edu

Hi,
Actually, I want a slotted line, and carriage, and RF probe.
Such as the HP 809B, HP 816, and (HP 442 or HP 447).
But any sturdy system will do.

  - Steve

NOTE:
  Becuase our net-news provider is having trouble getting posts
  out, I am posting this via a re-mailer. Be sure to respond
  to the following e-mail address:

        [e-mail]


  or call me at:
 [phone] (11am to 8pm pacific time)


From Unknown Wed Dec 13 14:38:50 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!dish.news.pipex.net!pipex!bt!btnet!demon!peer-news.britain.eu.net!EU.net!newsfeed.internetmci.com!in1.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!SantaFe!usenet
From: Jim Potter <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WTB: Slotted Line
Date: Tue, 12 Dec 1995 19:30:00 -0700
Organization: JP Accelerator Works, Inc.
Lines: 28
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: dial130.roadrunner.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b3 (WinNT; I)
To: [e-mail]

Steve Schiller wrote:
> If you want to make a cheap one suitable for UHF frequencies,
Take a piece of copper, aluminum or brass tubing at least
one-half wavelength long at your frequency, sized for a slip fit
over the center conductor of RG8/u type coax.  Drill holes every
cm or half inch or whatever.  Make a small E-field probe that
has a stop so it sticks in the same distance every time and
measure E (V) as a function of position.  The same thing works
with waveguide.  Just space the holes appropriately so that you
get 10 or so points per half-wavelength, and away you go.  A
cheap and easy prbe can be made from a short length of
semi-rigid line coax, the kind available surplus with SMA
connectors on the end.  Cut off one connector.  Cut away the
outer conductor to expose a length of center conductor.  Solder
a brass washer to the outer conductor about one wall thickness
(of your perforated line) back from the end.  Drill the holes to
clear the OD of the probe outer conductor (About 0.094" for the
stuff I have) and probe away.

Save big bucks.

Jim

--
James M. Potter, President      E-mail: [e-mail]
JP Accelerator Works, Inc.      URL: www.jpaw.com/jpaw/
2245 47th Street                Voice: 505-662-5804
Los Alamos, NM 87544-1604       FAX: [phone]


From Unknown Wed Dec 13 14:38:51 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!uwm.edu!math.ohio-state.edu!magnus.acs.ohio-state.edu!slip9-14.acs.ohio-state.edu!user
From: [e-mail] (Ron Long)
Newsgroups: rec.radio.amateur.homebrew
Subject: WTB: Smart Outlet Strip
Date: 10 Dec 1995 19:41:44 GMT
Organization: The Ohio State University
Lines: 6
Message-ID: <[e-mail]>
NNTP-Posting-Host: slip9-14.acs.ohio-state.edu

I am looking for a smart outlet strip - one where when a device plugged
into the 'master' outlet is powered on, the other outlets turn on so that
anything plugged in comes on. I believe Heathkit had something like this
and Radio Shack did also, but no longer.

Thanks, Ron w8gus.


From Unknown Wed Dec 13 14:38:52 1995
Path: news.epix.net!news.sprintlink.net!clue.callamer.com!biggulp.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WTB: Smart Outlet Strip
Date: Mon, 11 Dec 1995 16:09:54 -0800
Organization: CallAmerica, San Luis Obispo CA USA
Lines: 15
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: biggulp.callamer.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
NNTP-Posting-User: cbuttsch
In-Reply-To: <[e-mail]>

Hi Ron....some time since we chatted!  Let me suggest you look into some
of the RV suppliers for that plug strip.  They carry something similar in
which a low resistance connection into the plug strip automatically turns
on the motor generator.  73   de Cliff Buttschardt  W6HDO

On 10 Dec 1995, Ron Long wrote:

> I am looking for a smart outlet strip - one where when a device plugged
> into the 'master' outlet is powered on, the other outlets turn on so that
> anything plugged in comes on. I believe Heathkit had something like this
> and Radio Shack did also, but no longer.
>
> Thanks, Ron w8gus.
>
>


From Unknown Sun Dec 17 15:39:22 1995
Path: news.epix.net!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.digital.misc,rec.radio.amateur.antenna
Subject: !! High Tech WWW Site !!
Date: Thu, 14 Dec 95 06:46:08 PDT
Organization: epix.net
Lines: 12
Message-ID: <NEWTNews.818952380.14699.amsoft@486dx4_120>
NNTP-Posting-Host: lwbyppp57.epix.net
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage
Xref: news.epix.net rec.radio.amateur.homebrew:12123 rec.radio.amateur.equipment:22520 rec.radio.amateur.digital.misc:13110 rec.radio.amateur.antenna:17675


Covering Amateur Radio, Electronics, Engineering, Space, Scanners
Shortwave, and many more interesting Technical Areas.  Includes
0ver 400 WWW links, and a link to our September 95 CD-ROM archive
with over 23,000 files online.  Very HOT High Tech WWW Site

          http://hamster.business.uwo.ca/~amsoft/

         Surf The High Tech World from here today!





From Unknown Sun Dec 17 15:39:23 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!Germany.EU.net!wizard.pn.com!brighton.openmarket.com!decwrl!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news
From: Zack Lau <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: (no subject)
Date: Fri, 15 Dec 1995 15:46:39 -0800
Organization: American Radio Relay League
Lines: 22
Message-ID: <[e-mail]>
NNTP-Posting-Host: mgate.arrl.org
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b3 (Win16; I)

Tom Bruhns wrote:
>
> In the ten or so responses I've seen here, I've seen folk mention that
> carbon composition resistors are getting hard to find, but nobody
> has mentioned metal oxide resistors.  Commonly available in 1 and 2 watt
> sizes and perhaps larger, the ones I've checked in the 25 to 100 ohm range
> have very low parasitics.  I use a pair of 100 ohm, 2 watt, units in
> parallel as a load for testing my handheld, and have measured SWR around
> 1.3:1 at 450MHz and for practical dummy load purposes, 1:1 at 2 meters.

        I've recommended these in the past, and have gotten one
        complaint that they *look* too inductive to be useful.
        I decided his eyeball's weren't calibrated accurately,
        since he didn't even have a QRP rig/SWR meter to measure
        them...  Also, they are awfully rugged. 2 watt resistors
        will actually take 2 watts for short periods of time.  I've
        run also run them at 72% of full rating for a couple hours
        with no problems other than some melted insulation on the
        clip leads.  **Don't** try this with carbon compositions.

Zack KH6CP/1
[e-mail]


From Unknown Sun Dec 17 15:39:24 1995
Path: news.epix.net!news.sprintlink.net!cheatum.frontiernet.net!Empire.Net!news.net99.net!news.corpcomm.net!news.pe.net!news.internetMCI.com!newsfeed.internetmci.com!howland.reston.ans.net!EU.net!peer-news.britain.eu.net!uknet!ganymede.eclipse.co.uk!usenet
From: [e-mail] (ah8341)
Newsgroups: rec.radio.amateur.homebrew
Subject: *** HELP !  BREWING SOFTWARE,  KNOW OF ANY?
Date: Fri, 15 Dec 1995 04:04:39 GMT
Organization: Eclipse Networking Limited
Lines: 11
Message-ID: <4aq00d$[e-mail]>
NNTP-Posting-Host: ds1-p7.eclipse.co.uk
X-Newsreader: Forte Free Agent 1.0.82

I've had a request from a work colleague to find out whether there's
any brewery type management software available.  I've searched, fairly
simply with LYCOS etc, but not found anything.

Anybody help,  apparently there's a free pint it it!!!!!

Thanks,


Alan.



From Unknown Sun Dec 17 15:39:25 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!EU.net!peer-news.britain.eu.net!uknet!ganymede.eclipse.co.uk!usenet
From: [e-mail] (ah8341)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: *** HELP !  BREWING SOFTWARE,  KNOW OF ANY?
Date: Sat, 16 Dec 1995 05:57:36 GMT
Organization: Eclipse Networking Limited
Lines: 15
Message-ID: <4asr07$[e-mail]>
References: <4aq00d$[e-mail]>
NNTP-Posting-Host: ds1-p10.eclipse.co.uk
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (ah8341) wrote:

>I've had a request from a work colleague to find out whether there's
>any brewery type management software available.  I've searched, fairly
>simply with LYCOS etc, but not found anything.

>Anybody help,  apparently there's a free pint it it!!!!!

>Thanks,


>Alan.
SORRY POSTED TO THE WRONG GROUP , My mistake   :-(     Alan.




From Unknown Sun Dec 17 15:39:26 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!EU.net!Germany.EU.net!news.dfn.de!server2.rz.uni-leipzig.de!news.uni-jena.de!news.tu-ilmenau.de!prakinf2.PrakInf.TU-Ilmenau.DE!news.uni-stuttgart.de!uni-regensburg.de!lrz-muenchen.de!uni-erlangen.de!news.th-darmstadt.de!news
From: Judge Dreed <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: - I AM THE LAW -
Date: 13 Dec 1995 07:45:57 GMT
Organization: LAWLIB
Lines: 16
Message-ID: <4am0bl$[e-mail]>
NNTP-Posting-Host: pool2-2.hrz.th-darmstadt.de
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2N (Windows; I; 16bit)


Would that sound OK for the courtroom?

I still have no information how far the proof will go on Thursday?

Better be quiet? Mhmm, the subject above may seem adaequat?

If not i will tell the easy version, ok?

---

Anyhow again, on Saturday after the *Witchhunt* play had been an GOROTEX
advertisment on the Schloss-Haltestelle. WHO & WHY this happen???
I think i have the right to get a clear statement, cause tthis bahavior
is in no way adequate!!! so what??



From Unknown Sun Dec 17 15:39:27 1995
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!agate!howland.reston.ans.net!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Lawrence Stoskopf)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 100 W 7 MHz amp
Date: 15 Dec 95 04:20:06 GMT
Organization: ucsd usenet gateway
Lines: 14
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

For this range of power and frequency, a look at an article in May 1995 RF
Design is in order.  They have described in an article "High-Efficiency
Power Amplifiers for 13.56 ISM and HF Communications", a two (plastic)
MOSFET amp that puts out 400 W CW with 5 watts in using a 100 V power
supply.  Am thinking about building one for 160 for use when I don't want to
turn on the big amp.

        You might write Richardson Electronics, Ltd, 40W267 Keslinger Road,
LaFox,Ill 60147 for a reprint and data sheets.  The amp looks simple with no
big headaches if you have some experience in homebrew.  Suspect someone will
have an article out in the ham mags on this soon....it's too good to overlook.
Lawrence E. Stoskopf
N0UU



From Unknown Sun Dec 17 15:39:28 1995
Path: news.epix.net!news.sprintlink.net!cheatum.frontiernet.net!usenet
From: [e-mail] (John R. Cunliffe)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 100 W 7 MHz amp
Date: Fri, 15 Dec 1995 22:47:44 GMT
Organization: Frontier Internet Access
Lines: 18
Message-ID: <4ascbu$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: no-name-104.frontiernet.net
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Lawrence Stoskopf) wrote:

>For this range of power and frequency, a look at an article in May 1995 RF
>Design is in order.  They have described in an article "High-Efficiency
>Power Amplifiers for 13.56 ISM and HF Communications", a two (plastic)
>MOSFET amp that puts out 400 W CW with 5 watts in using a 100 V power
>supply.  Am thinking about building one for 160 for use when I don't want to
>turn on the big amp.


Beware...this is not for linear amplification and can not be modified
to do so...its purly for class C.

=============================
John R. Cunliffe     N2NEP
[e-mail]
http://www.frontiernet.com/~cunliffe



From Unknown Sun Dec 17 15:39:29 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!frankensun.altair.com!nntp.coast.net!chi-news.cic.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netcom.com!dgf
From: [e-mail] (David Feldman)
Subject: Re: 100 W 7 MHz amp
Message-ID: <[e-mail]>
Organization: Organization? Me?
References: <[e-mail]> <4ascbu$[e-mail]>
Date: Sat, 16 Dec 1995 16:30:18 GMT
Lines: 19
Sender: [e-mail]

In article <4ascbu$[e-mail]> [e-mail] writes:
>[e-mail] (Lawrence Stoskopf) wrote:
>
>>For this range of power and frequency, a look at an article in May 1995 RF
>>Design is in order.  They have described in an article "High-Efficiency
>
>Beware...this is not for linear amplification and can not be modified
>to do so...its purly for class C.

I'm probably totally out of turn (having not read the original article,
but would like to do so) but.... wouldn't it be pretty easy to get the amp
into a linear mode if it's based on FETs ... just bias the gates into the
linear region, or is there something more to it than that? It seems like a
high power solid state amp that runs off about 300V would be a really neat
toy (you could do good AC line isolation and not even have to worry about
the weight of a power transformer for 220VAC operation!)

73 Dave WB0GAZ [e-mail]



From Unknown Sun Dec 17 15:39:30 1995
Newsgroups: sci.electronics,rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!news.kei.com!newsstand.cit.cornell.edu!cornellcs!rochester!news.csug.rochester.edu!rit!sunsrvr6!jdc
From: [e-mail] (James D. Cronin)
Subject: Re: 12VDC
Message-ID: <[e-mail]>
Sender: [e-mail] (Operator)
Organization: Northern Telecom, Network Application Systems
References: <4a9qhe$[e-mail]> <[e-mail]> <4aabpg$[e-mail]> <4ajfdc$[e-mail]>
Date: Fri, 15 Dec 1995 17:52:22 GMT
Lines: 13
Xref: news.epix.net sci.electronics:162558 rec.radio.amateur.homebrew:12169

In article <4ajfdc$[e-mail]>,
Richard Steven Walz <[e-mail]> wrote:
...
>For garage door openers it is pretty easy to monitor a broad band of
>frequencies and grab your code out of the air. A protection for this

What frequencies do they work on?  Is it some audio-shift keying scheme
that could be recorded and played back?

Running through all combinations sounds more reliable, since it
does not require waiting around to record a door opening.

Jim


From Unknown Sun Dec 17 15:39:31 1995
Path: news.epix.net!news.sprintlink.net!hookup!gatech2!bloom-beacon.mit.edu!spool.mu.edu!howland.reston.ans.net!newsfeed.internetmci.com!chi-news.cic.net!news.uiowa.edu!crpl.cedar-rapids.lib.ia.us!SABINW
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: 50 watt PA for 7 MHz
Date: 14 Dec 1995 19:13:09 GMT
Organization: Cedar Rapids Public Library, Cedar Rapids, IA,  52401
Lines: 10
Distribution: world
Message-ID: <4apt05$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: crpl.cedar-rapids.lib.ia.us

>
>"Andrew M. Moore" <[e-mail]> wrote:
>
>
>>I plan on building a 50 to 100 watt amplifier for 7 MHz CW, using from
>>1 to to 5 watts drive.

There is a very excellent 50 Watt solid state PA project in Chapter 17
of the ARRL Handbook, 1995 and 1996 editions, that you might want
to take a look at.


From Unknown Sun Dec 17 15:39:32 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!news.nic.surfnet.nl!tuegate.tue.nl!news.IAEhv.nl!news
From: Nanno van Haaften <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: 6K7 and 6V6 DATA needed!
Date: 14 Dec 1995 21:32:06 GMT
Organization: Internet Access Eindhoven, the Netherlands
Lines: 23
Message-ID: <4aq54m$[e-mail]>
NNTP-Posting-Host: pm1d06.iaehv.nl
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Macintosh; I; PPC)
X-URL: news:rec.radio.amateur.homebrew

Hi there!

I am going to build a 1V2 rx with my 9 year old daughter. To make the
whole thing a bit more historical, we are going to use the 6k7 and 6V6
valves. I got them already, some real nice oldies, but do not know the
exact specs and socket terminations.

Who can give me this data?

tnx es 73, Gert
(via email address below)
_______________
       _
     /__  Nanno van Haaften
    /___  PE1OLQ
   /____  [e-mail]
  /_____  [e-mail]
 /______
/_______  without U, Units would be nits.

Home Page: http://www.iaehv.nl/users/vhaaften/




From Unknown Sun Dec 17 15:39:33 1995
Path: news.epix.net!news.sprintlink.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!EU.net!peer-news.britain.eu.net!demon!mail2news.demon.co.uk!briano.demon.co.uk
From: Brian Olliver <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: 6V6 and 6K7 data request ??e-mail add
Date: Sat, 16 Dec 95 13:47:43 GMT
Organization: Myorganisation
Lines: 10
Message-ID: <[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: briano.demon.co.uk
X-Newsreader: Demon Internet Simple News v1.29

i have tried to mail this info to you but it
keeps on bouncing
is your address corupted on the article?
--
  Brian Olliver,G8DQQ he who expects nothing won't be disappointed.
               (44)01952-413484; 0973-731454
      I hate taxes, I want to be free to waste my own money
       vive la revolution, but hurry up i'm getting too old.
 xxxxxxxxxxxxxxxxxxxxxxxxxxxx            xxxxxxxxxxxxxxxxxxxxxxxxxx


From Unknown Sun Dec 17 15:39:34 1995
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!sol.ctr.columbia.edu!ucsnews!newshub.sdsu.edu!newshub.csu.net!newsserver.sdsc.edu!news.cerf.net!proton.llumc.edu!galaxy.ucr.edu!library.ucla.edu!info.ucla.edu!newsfeed.internetmci.com!news-feed.mci.newscorp.com!news2.near.net!maceo.emedia.net!jliao-b.liao.emedia.net!user
From: [e-mail] (Albert Liao)
Newsgroups: rec.radio.amateur.homebrew
Subject: Am reception in your teeth?
Date: 15 Dec 1995 01:15:15 GMT
Organization: Rhapsody Consulting
Lines: 18
Message-ID: <[e-mail]>
NNTP-Posting-Host: jliao-b.liao.emedia.net

here's a question i've been trying to figure out:
a lot of people claim they can hear AM transmissions through
their dental work or bedsrpings. how does this happen? obiviously,
the metalic structure of the dental work and the springs can act as
antenna's but what is demodulating the signal from the carrier?
and what is used to amplify the sound?

anyways, just doing some wondering.

if you have any ideas, it would be really nice if you emailed it
to me!

mucho gracias!

--
--
Albert Liao
<[e-mail]>


From Unknown Sun Dec 17 15:39:35 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!btnet!demon!mail2news.demon.co.uk!lfheller.demon.co.uk
From: Leon Heller <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ARRL books
Date: Wed, 13 Dec 95 19:19:23 GMT
Organization: Home
Lines: 25
Message-ID: <[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: lfheller.demon.co.uk
X-Newsreader: Demon Internet Simple News v1.29

In article <[e-mail]>
           [e-mail] "Robert A. Lanier" writes:

> Has anyone purchased the following books:
>
>         Introduction to Radio Frequency Design by Wes Hayward
>
>         QRP Classics
>
> Both are available from ARRL. I looking for a good intermediate to
> advanced book on RF design, one that has practical circuits, but also
> detailed theory.
>
> Any comments are welcome.

I've got both these books. The RF design book is excellent, and has
plenty of theory. QRP Classics has a lot of rather old designs (I
suppose that is why they are classics), with very little theory.

Leon
--
Leon Heller, G1HSM                | "Do not adjust your mind, there is
E-mail [e-mail]  |  a fault in reality": on a wall
Phone: [phone]         |  many years ago in Oxford.


From Unknown Sun Dec 17 15:39:36 1995
Path: news.epix.net!uunet!in2.uu.net!xplor.com!news.us.world.net!ns2.mainstreet.net!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail](michael silva)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ARRL books
Date: 13 Dec 1995 21:25:15 GMT
Organization: Netcom
Lines: 29
Message-ID: <4angbr$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: val-ca2-13.ix.netcom.com
X-NETCOM-Date: Wed Dec 13  1:25:15 PM PST 1995

In <[e-mail]> Leon Heller
<[e-mail]> writes:
>
>In article <[e-mail]>
>           [e-mail] "Robert A. Lanier" writes:
>
>> Has anyone purchased the following books:
>>
>>         Introduction to Radio Frequency Design by Wes Hayward
>>
>>         QRP Classics
>>
>> Both are available from ARRL. I looking for a good intermediate to
>> advanced book on RF design, one that has practical circuits, but >>
also detailed theory.

>I've got both these books. The RF design book is excellent, and has
>plenty of theory. QRP Classics has a lot of rather old designs (I
>suppose that is why they are classics), with very little theory.

In addition, the ARRL has "Solid State Design for the Radio Amateur", a
good combination of theory and practical circuits, and also the W1FB
notebooks ("W1FB's QRP Notebook" and "W1FB's Design Notebook") which
have less theory but lots of circuits.  I took the coward's way out and
got them all...

73,
Mike, KK6GM



From Unknown Sun Dec 17 15:39:37 1995
Path: news.epix.net!news.sprintlink.net!news.texas.net!news1.best.com!sgigate.sgi.com!swrinde!newsfeed.internetmci.com!in2.uu.net!news.deltanet.com!news.deltanet.com!lehman
From: [e-mail] (Jeff Lehman)
Newsgroups: rec.radio.amateur.homebrew
Subject: Battery Monitor
Date: 15 Dec 1995 07:20:51 GMT
Organization: Delta Internet Services, Anaheim, CA
Lines: 8
Message-ID: <4ar7kj$[e-mail]>
NNTP-Posting-Host: delta1.deltanet.com
X-Newsreader: TIN [version 1.2 PL2]

I am building a portable power source and want to build a voltage meter using
a few LEDs.  I figured I'd use some zener diode circuit.  I want to start at
12.6 volts and work down to 12.0 volts.  In other words all LEDs lighted
when fully charged then to extinguish as the battery drains.  I'd appreciate
any help.

Thanks, Jeff KD6DHB



From Unknown Sun Dec 17 15:39:38 1995
Path: news.epix.net!usenet
From: Garry Foster <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Battery Monitor
Date: 16 Dec 1995 18:59:39 GMT
Organization: epix.net
Lines: 19
Message-ID: <4av4ur$[e-mail]>
References: <4ar7kj$[e-mail]>
NNTP-Posting-Host: peach.epix.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)

[e-mail] (Jeff Lehman) wrote:
 I am building a portable power source and want to build a voltage meter
 sing
 >a few LEDs.  I figured I'd use some zener diode circuit.  I want to
 start at
 >12.6 volts and work down to 12.0 volts.  In other words all LEDs
 lighted
 >when fully charged then to extinguish as the battery drains.  I'd
 appreciate
 >any help.
 >
 >Thanks, Jeff KD6DHB
 >
Use a bargraph driver chip. Radio shack used to sell one and if they
don't I'm sure they can be mail ordered. I have seen just such a circuit
built using these chips. Super simple but I don't have the numbers off
the top of my head.
                                          Garry WB0NNO



From Unknown Sun Dec 17 15:39:39 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!howland.reston.ans.net!EU.net!peer-news.britain.eu.net!demon!mail2news.demon.co.uk!lfheller.demon.co.uk
From: Leon Heller <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Battery Monitor
Date: Sat, 16 Dec 95 21:27:19 GMT
Organization: Home
Lines: 20
Message-ID: <[e-mail]>
References: <4ar7kj$[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: lfheller.demon.co.uk
X-Newsreader: Demon Internet Simple News v1.29
X-SMTP-Posting-Host: lfheller.demon.co.uk [Sat, 16 Dec 95 22:18:04 GMT]
X-SMTP-Posting-Host: post.demon.co.uk [Sat, 16 Dec 95 22:19:18 GMT]

In article <4ar7kj$[e-mail]>
           [e-mail] "Jeff Lehman" writes:

> I am building a portable power source and want to build a voltage meter using
> a few LEDs.  I figured I'd use some zener diode circuit.  I want to start at
> 12.6 volts and work down to 12.0 volts.  In other words all LEDs lighted
> when fully charged then to extinguish as the battery drains.  I'd appreciate
> any help.
>
> Thanks, Jeff KD6DHB

The National LM3914/5/6 bargraph driver chips are designed for this sort
of application.

Leon
--
Leon Heller, G1HSM                | "Do not adjust your mind, there is
E-mail [e-mail]  |  a fault in reality": on a wall
Phone: [phone]         |  many years ago in Oxford.


From Unknown Sun Dec 17 15:39:40 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!agate!cocoa.brown.edu!news
From: [e-mail] (john 015)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Battery Monitor
Date: Sun, 17 Dec 1995 14:17:06 EST
Organization: Brown University - Providence, Rhode Island  USA
Lines: 37
Message-ID: <4b1qf5$[e-mail]>
References: <4ar7kj$[e-mail]> <4av4ur$[e-mail]>
NNTP-Posting-Host: brownvm.brown.edu
X-News-Software: BNN via BNN_POST v1.0 beta

In article <4av4ur$[e-mail]>, Garry Foster <[e-mail]> said:
>Posted on 16 Dec 1995 at 13:59:39 by Garry Foster
>
>Re: Battery Monitor
>
>From: Garry Foster <[e-mail]>
>Newsgroups: rec.radio.amateur.homebrew
>Date: 16 Dec 1995 18:59:39 GMT
>Organization: epix.net
>Message-ID: <4av4ur$[e-mail]>
>References: <4ar7kj$[e-mail]>
>
>[e-mail] (Jeff Lehman) wrote:
> I am building a portable power source and want to build a voltage meter
> sing
> >a few LEDs.  I figured I'd use some zener diode circuit.  I want to
> start at
> >12.6 volts and work down to 12.0 volts.  In other words all LEDs
> lighted
> >when fully charged then to extinguish as the battery drains.  I'd
> appreciate
> >any help.
> >
> >Thanks, Jeff KD6DHB
> >
>Use a bargraph driver chip. Radio shack used to sell one and if they
>don't I'm sure they can be mail ordered. I have seen just such a circuit
>built using these chips. Super simple but I don't have the numbers off
>the top of my head.

LM3914 drives 10 diodes linearily with the input voltage.  Works down to
5 V I think and as high as 18 V (Vsupply).  About $3.  You can choose
between single diode or staple display by manipulating one input
pin.  I think a sample circuit is in Radio Electronics April 92
as part of an LED based oscilloscope display.

john


From Unknown Sun Dec 17 15:39:41 1995
Path: news.epix.net!news.sprintlink.net!nw003.infi.net!imci3!imci2!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (TANTONR)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Book by Kenneth Cornell?
Date: 14 Dec 1995 21:13:57 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 3
Sender: [e-mail]
Message-ID: <4aqll5$[e-mail]>
References: <4a8coi$[e-mail]>
Reply-To: [e-mail] (TANTONR)
NNTP-Posting-Host: newsbf02.mail.aol.com

I had a copy about 15 years ago- it was old then.
Why not try writing W2IMB himself?
VE3IEY


From Unknown Sun Dec 17 15:39:42 1995
Path: news.epix.net!uunet!in1.uu.net!tank.news.pipex.net!pipex!demon!peer-news.britain.eu.net!EU.net!howland.reston.ans.net!blackbush.xlink.net!rz.uni-karlsruhe.de!news.uni-stuttgart.de!moritz
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Building 50-100W 7 MHz amp - suggestions?
Date: 13 Dec 1995 16:09:05 GMT
Organization: Comp.Center (RUS), U of Stuttgart, FRG
Lines: 10
Message-ID: <4amtr1$[e-mail]>
References: <[e-mail]> <4alg5n$[e-mail]>
NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de


There are two possible approaches:

Follow the information in the RF device data book by motorola,
however the transistors are not too cheap. (works for 40 and 6)

On HF there is the alternative of using simple power MOS-FET's.
QST had several articles about them.

73, Moritz DL5UH


From Unknown Sun Dec 17 15:39:43 1995
Path: news.epix.net!news.sprintlink.net!oronet!news
From: [e-mail] (Jim Weir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Building 50-100W 7 MHz amp - suggestions?
Date: Thu, 14 Dec 1995 18:18:17 GMT
Organization: RST Engineering
Lines: 45
Message-ID: <4apppo$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: rst-engr.oro.net
X-Newsreader: Forte Free Agent 1.0.82

"Andrew M. Moore" <[e-mail]> wrote:


>I plan on building a 50 to 100 watt amplifier for 7 MHz CW, using from
>1 to 5 watts drive.  I would like to hear people's suggestions about
>the design, components, gotchas, sources of information, etc. before I
>get started.

>Thanks,
>-Drew

Well, not to put the kibosh on your affinity for solid state thingies,
but tubes (hot fets, radios that glow in the dark, etc.) are one hell
of a lot easier to build and experiment with the first time around.
You can mistune them, overdrive them, have them birdie and oscillate
to beat the band and all you will get is a cherry red plate and/or
popped fuse.  Say "oops" and start over.  With a transistor, say
"oops" and buy another pair.  The transistor will ALWAYS protect the
fuse by blowing first.

Go back to the mid-60s to 70s ARRL manuals and you will find literally
dozens of designs to choose from using TV sweep tubes, the old
faithful 6146 (which, if done carefully, will do a credible job all
the way to 144 MHz.) and a host of other methods.

Me, I personally like a pair of 807s plate modulated AM with an 811
;-}...or even better, a pair of 1625s so I can run the filaments
straight from the car battery with a dynamotor for plate voltage
(lordy, am I showing my age or what).

The only caveat is that you AIN'T working with 12 volt tickles.  600
volts at half an amp will get your attention, so don't forget the
shorting stick when you are working on these beasts.

Jim




Jim Weir VP Engineering  | "We seem to be standing on
RST Engineering          |  the foreskin of technology."
Grass Valley CA 95945    | (Gen Chuck Yeager)
voice/fax [phone]   |
[e-mail]  AR Adv WB6BHI  CFI A&G/Comml Inst A&G/A&P/C-182A N73CQ



From Unknown Sun Dec 17 15:39:44 1995
Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Tim Hynde ka8ddz/qrp Rochester, MI )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Building 50-100W 7 MHz amp - suggestions?
Date: 14 Dec 1995 18:40:57 GMT
Organization: Netcom
Lines: 42
Message-ID: <4apr3p$[e-mail]>
References: <[e-mail]> <4apppo$[e-mail]>
NNTP-Posting-Host: ix-pon-mi4-08.ix.netcom.com
X-NETCOM-Date: Thu Dec 14 10:40:57 AM PST 1995

In <4apppo$[e-mail]> [e-mail] (Jim Weir) writes:
>
>"Andrew M. Moore" <[e-mail]> wrote:
>
>
>>I plan on building a 50 to 100 watt amplifier for 7 MHz CW, using from
>>1 to 5 watts drive.  I would like to hear people's suggestions about
>>the design, components, gotchas, sources of information, etc. before I
>>get started.
>
>>Thanks,
>>-Drew

> [e-mail] (Jim Weir) writes:
>
>Well, not to put the kibosh on your affinity for solid state thingies,
>but tubes (hot fets, radios that glow in the dark, etc.) are one hell
>of a lot easier to build and experiment with the first time around.
>You can mistune them, overdrive them, have them birdie and oscillate
>to beat the band and all you will get is a cherry red plate and/or
>popped fuse.  Say "oops" and start over.  With a transistor, say
>"oops" and buy another pair.  The transistor will ALWAYS protect the
>fuse by blowing first.

--snip--

Tubes!! Yuuuck, (No disrespect to Mr. Weir intended) all that trouble
for 100 watts? I'd try the Motorola EB63 from their handbook, you can
get the board, and all parts less enclosure and connectors from
Communications Concepts in Xenia Ohio 513-426-8600. The unit delivers
140 watts with 1-5 watts drive, broadband, NO TUNING, 13v @ 22amps.
Uses MRF-454 transistors, a pair of them matches costs about $35 The
whole enchilada is less than $100 I think.

Good Luck,

Tim Hynde







From Unknown Sun Dec 17 15:39:46 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!usenet.eel.ufl.edu!newsfeed.internetmci.com!globe.indirect.com!usenet
From: [e-mail] (Jeff Duntemann)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Building 50-100W 7 MHz amp - suggestions?
Date: Sat, 16 Dec 1995 00:55:49 GMT
Organization: The Coriolis Group, Inc.
Lines: 22
Message-ID: <4at5ha$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: s179.phxslip4.indirect.com
X-Newsreader: Forte Free Agent v0.55

"Andrew M. Moore" <[e-mail]> wrote:

>I plan on building a 50 to 100 watt amplifier for 7 MHz CW, using from
>1 to 5 watts drive.  I would like to hear people's suggestions about
>the design, components, gotchas, sources of information, etc. before I
>get started.

Somewhere in QST about ten years ago there was a circuit for a Class C
final using an IRF530 power FET running on 24V.  With a good heatsink
the author said it would do 50 watts, for less than a watt input.  The
circuit was awesomely simple, and if you give me a day or so I'll dig
around and find the exact issue.  It wasn't a feature article; it was
in Technical Correspondence.

It could be exactly what you're looking for.

--73--

--Jeff Duntemann KG7JF
  Scottsdale, Arizona




From Unknown Sun Dec 17 15:39:46 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!howland.reston.ans.net!ix.netcom.com!netcom.com!rohrwerk
From: [e-mail] (John Seboldt)
Subject: Re: Building 50-100W 7 MHz amp - suggestions?
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
References: <[e-mail]>
Date: Sat, 16 Dec 1995 04:54:34 GMT
Lines: 15
Sender: [e-mail]

The CCI amplifier kits are good starting points.  All on board parts, PC
board included... you gotta supply enclosure, heat sink, switching, and
output filter.  I have the AN762 design -- 140 watt max -- waiting to be
built.  All based on Motorola design bulletins.

Communication Concepts Inc
508 Millstone Dr.
Beavercreek OH   45434
513 426-8600

: John Seboldt  [e-mail]  / CW:  It don't mean a thing
:      K0JD... Minneapolis, MN      /  if it ain't got that swing!
:   My R2/T2 station described in  / Di dah, di dah, di dah, di dah...
> http://www.lehigh.edu/lists/qrp-l/k0jd/index.html <



From Unknown Sun Dec 17 15:39:47 1995
Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!globe.indirect.com!usenet
From: [e-mail] (Jeff Duntemann)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Building 50-100W 7 MHz amp - suggestions?
Date: Sun, 17 Dec 1995 01:44:38 GMT
Organization: The Coriolis Group, Inc.
Lines: 23
Message-ID: <4avtn4$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: s124.phxslip4.indirect.com
X-Newsreader: Forte Free Agent 1.0.82

"Andrew M. Moore" <[e-mail]> wrote:

>I plan on building a 50 to 100 watt amplifier for 7 MHz CW, using from
>1 to 5 watts drive.  I would like to hear people's suggestions about
>the design, components, gotchas, sources of information, etc. before I
>get started.

Home again.  If you have access to older QSTs, get the November 1989
issue, and look at "Technical Correspondence" on Page 38.  A longish
piece on power FET amps follows, which addresses weaknesses in a Doug
DeMaw design published in the April 89 QST.  On page 40 is the IRF530
amp I mentioned in my earlier response.  The text says it can output
up to 50W at 14 Mhz with as little as 1.5W of drive.  "Similar output
is available on 80M driven with nothing more than a crystal
oscillator."  There's some math to be done in working out the matching
networks, and probably a little cut and try, but it's awesomely simple
and I hope to put one together at some point.

--73--

--Jeff Duntemann KG7JF
  Scottsdale, Arizona



From Unknown Sun Dec 17 15:39:49 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.msfc.nasa.gov!pendragon!toad.jsc.nasa.gov!user
From: [e-mail] (Ted Kell)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Can't find source for 2N4
Date: Fri, 15 Dec 1995 13:04:56 -0600
Organization: NASA Johnson Space Center, Houston, TX, USA
Lines: 37
Distribution: world
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: toad.jsc.nasa.gov
X-Newsreader: Yet Another NewsWatcher 2.1.2


You can't order _anything_ from Dan's right now.  He is _not_ available.

Nobody seems to know where he is, but there are lots of rumours.



In article <[e-mail]>, [e-mail] (Jim
Horner) wrote:

> JG>From: [e-mail] (James Griffith)
> JG>Subject: Can't find source for 2N4416 JFET It's high output MPF102
>
> JG>Been doing some QRP building and have stocks of the usual transistors and
> JG>parts needed for QRP, but can only find the MPF102 and not the 2N4416
> JG>higher output version at the ususal sources. i.e., Mouser, Jamco, JDR,
> JG>any suggestions.
> JG>Jim, WA7NDD
> JG>[e-mail]
>
> Dan's Small Parts and Kits lists them at $1.50 in the slightly outdated
> catalog I have (1994-june95). You can't order by creditcard tho... But
> the catalog has tons of cool bits and kits, all for QRP homebrewing ;-)
> Address is: Dan's Small Parts and Kits
>             1935 So. 3rd West N0. 1
>             Missoula, MT 59801
>                Ph. 406-543-2872
>  I bought a kit from this guy a year or so ago. It took a little longer
> to arrive than from some places since you have to send a check or MO,
> but he sure has a cool list of stuff for sale.
> Not a quick source for your 2N4416s perhaps, but I thought this source
> worth mention.
> Hope this helps someone
> ...Jim
>
> ---
>  * OLX 2.1 TD * On a beer day, you can pee forever.


From Unknown Sun Dec 17 15:39:50 1995
Path: news.epix.net!uunet!in2.uu.net!spool.mu.edu!agate!holonet!colossus.holonet.net!minfox!jim.horner
From: [e-mail] (Jim Horner)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Can't find source for 2N4
Date: Thu, 14 Dec 1995 04:11:00 GMT
Message-ID: <[e-mail]>
Organization: MINFOX Courtenay, BC (604)-337-2023
Distribution: world
References: <[e-mail]>
Lines: 27

JG>From: [e-mail] (James Griffith)
JG>Subject: Can't find source for 2N4416 JFET It's high output MPF102

JG>Been doing some QRP building and have stocks of the usual transistors and
JG>parts needed for QRP, but can only find the MPF102 and not the 2N4416
JG>higher output version at the ususal sources. i.e., Mouser, Jamco, JDR,
JG>any suggestions.
JG>Jim, WA7NDD
JG>[e-mail]

Dan's Small Parts and Kits lists them at $1.50 in the slightly outdated
catalog I have (1994-june95). You can't order by creditcard tho... But
the catalog has tons of cool bits and kits, all for QRP homebrewing ;-)
Address is: Dan's Small Parts and Kits
            1935 So. 3rd West N0. 1
            Missoula, MT 59801
               Ph. 406-543-2872
 I bought a kit from this guy a year or so ago. It took a little longer
to arrive than from some places since you have to send a check or MO,
but he sure has a cool list of stuff for sale.
Not a quick source for your 2N4416s perhaps, but I thought this source
worth mention.
Hope this helps someone
...Jim

---
 * OLX 2.1 TD * On a beer day, you can pee forever.


From Unknown Sun Dec 17 15:39:51 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!math.ohio-state.edu!newsfeed.acns.nwu.edu!ftpbox!mothost!schbbs!news
From: [e-mail] (Dan Tayloe )
Subject: Re: Can't find source for 2N4416 JFET It's hig
Reply-To: [e-mail]
Organization: Motorola Satellite Communications
Date: Thu, 14 Dec 1995 16:55:55 GMT
Message-ID: <[e-mail]>
References: <[e-mail]>
Sender: [e-mail] (SCHBBS News Account)
Nntp-Posting-Host: 170.1.5.166
Lines: 29

>Been doing some QRP building and have stocks of the usual transistors and
>parts needed for QRP, but can only find the MPF102 and not the 2N4416
>higher output version at the ususal sources. i.e., Mouser, Jamco, JDR,
>any suggestions.
>Jim, WA7NDD
>[e-mail]


My Motorola data book has brief data for 2N5484, 2N5485, and 2N5486 FETs.
For detailed characteristic graphs, it refers to the 2N4416.  From this
it appears that these are basically 2N4416 that have been graded into
narrower gate pinch off voltage ranges.

2N4416:  Vgs  -1   to -5.5v
2N5484:  Vgs  -0.3 to -3v
2N5485:  Vgs  -0.5 to -4v
2N5486:  Vgs  -2   to -6v

For more power gain, the 2N5486 is the hotter device.

The local small parts mail order house I deal with locally here in Phoenix
(DC Electronics 1-800-467-7736) has these parts (2N5484,5,6) for $.75 each.

- Dan Tayloe, WB0NVB, Phoenix, AZ.







From Unknown Sun Dec 17 15:39:52 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!news-relay.us.dell.com!pmafire!net.ricks.edu!usenet
From: [e-mail] (James Griffith)
Subject: Can't find source for 2N4416 JFET It's high output MPF102
Message-ID: <[e-mail]>
Sender: [e-mail] (usenet)
Organization: Ricks College
X-Newsreader: WinVN 0.93.11
Mime-Version: 1.0
Date: Wed, 13 Dec 1995 18:48:23 GMT
Lines: 8

Been doing some QRP building and have stocks of the usual transistors and
parts needed for QRP, but can only find the MPF102 and not the 2N4416
higher output version at the ususal sources. i.e., Mouser, Jamco, JDR,
any suggestions.
Jim, WA7NDD
[e-mail]




From Unknown Sun Dec 17 15:39:52 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail](michael silva)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Can't find source for 2N4416 JFET It's high output MPF102
Date: 13 Dec 1995 21:48:07 GMT
Organization: Netcom
Lines: 15
Message-ID: <4anhmn$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: val-ca1-14.ix.netcom.com

In <[e-mail]> [e-mail] (James Griffith) writes:
>
>Been doing some QRP building and have stocks of the usual transistors
>and parts needed for QRP, but can only find the MPF102 and not the
>2N4416 higher output version at the ususal sources. i.e., Mouser,
>Jamco, JDR,

Two places I like are Unicorn Electronics in CA (800-824-3432) and
Circuit Specialists in AZ (800-528-1417).  They both carry the 2N4416,
as well as the 2N5486, a plastic device similar to the '4416 but at
about 1/3 the price.

73,
Mike, KK6GM



From Unknown Sun Dec 17 15:39:53 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!uwm.edu!msunews!netnews.upenn.edu!netaxs.com!usenet
From: Rocci <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: DC Rcvr w/DSP backend
Date: Sat, 16 Dec 1995 08:55:25 -0800
Organization: Net Access - Philadelphia's Internet Connection
Lines: 12
Message-ID: <[e-mail]>
NNTP-Posting-Host: slip-748.netaxs.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b2a (Windows; I; 16bit)

A couple of hams that I work with have been kicking around the notion
of building a direct conversion receiver using a quadrature NCO for
the local oscillator, and a dual input DSP to perform the phase shift
and audio filtering functions. Seems that a very high performance unit
could be built with extreme reproducability and reasonable cost.
A couple of threads on this topic have started and fizzled here, but
I'm wondering if anyone would like to discuss forming a 'virtual
project team', either on this group, or some other Internet vehicle to
try to pull this off.

Joe
WA3CMQ


From Unknown Sun Dec 17 15:39:55 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news1!ts04-ind-17
From: [e-mail] (Mike Cline)
Subject: Re: Drilling PC boards
X-Nntp-Posting-Host: ts04-ind-17.iquest.net
Message-ID: <[e-mail]>
Sender: [e-mail] (News Admin)
Organization: IQuest Internet, Inc.
X-Newsreader: News Xpress Version 1.0 Beta #2.1
References: <[e-mail]> <4a53br$[e-mail]>
Date: Thu, 14 Dec 1995 00:50:21 GMT
Lines: 12

Has anyone tried one of those cheap($600) CNC machines to
automatically drill boards? I'm thinking of buying one after
the first of the year since the old eyes aren't much good for
that kind of accuracy anymore.
   The one I inquired about comes with a holder for a dremel
tool, and a little CAD package to control it. A programmer
friend of mine is interested in playing around with it too,
and would probably develop some software to read drill files
created by a lot of the pcb layout programs.
Mike
N9RJW



From Unknown Sun Dec 17 15:39:57 1995
Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!news3.net99.net!news.cais.net!primus.ansouth.net!news.internetMCI.com!newsfeed.internetmci.com!howland.reston.ans.net!news.cac.psu.edu!usenet
From: [e-mail] (Robert Crable)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Drilling PC boards
Date: 15 Dec 1995 18:16:51 GMT
Organization: Penn State University
Lines: 47
Message-ID: <4ase2j$[e-mail]>
References: <[e-mail]> <4a53br$[e-mail]> <[e-mail]>
NNTP-Posting-Host: iodine.chem.psu.edu
Mime-Version: 1.0
X-Newsreader: WinVN 0.93.14

In article <[e-mail]>, [e-mail] says...
>
>Has anyone tried one of those cheap($600) CNC machines to
>automatically drill boards? I'm thinking of buying one after
>the first of the year since the old eyes aren't much good for
>that kind of accuracy anymore.
>   The one I inquired about comes with a holder for a dremel
>tool, and a little CAD package to control it. A programmer
>friend of mine is interested in playing around with it too,
>and would probably develop some software to read drill files
>created by a lot of the pcb layout programs.
>Mike
>N9RJW
>
Mike,
  I work in an electronics shop where people need small boards (less than
8.5 x 11 inches) quickly and often, and we got tired of drilling them by
hand, with the problems of connectors that wouldn't go in holes, missing
holes in ground planes since they're hard to see, etc., so we built
ourselves a machine to drill the holes for us.  It's made of scrap dot
matrix printers, with their precision ground rods, stepper motors, and
belt drives.  The accuracy is 1/300th of an inch, since the printers were
300dpi.  With this machine, we can drill about 1.5 holes per second, and
it doesn't miss any, either.  My boss wrote the software to take in the pc
board files (for small boards we use an old program called Smartworks,
from Wintek) and it finds the holes, displays them on the screen, you line
up two holes on the opposite corners, and it drills the board.  He also
wrote some software to interpret ASCII and Orcad drill files.  We haven't
drilled a board by hand since we built it, almost 3 years ago, and it is a
lifesaver for me.
  If anyone would like more details they can post to here and I'll see
what I can do.

   Also, we use a laser printer, sugar paper from DynaArt, a fuser roller
from and old laser printer, and a bubble tank with ammonium persulfate
with excellent results.  Again, we have made hundreds of boards with good
success with 16 and 50 mil runs, so if anyone has any questions we can
help with, ask.

                                        Regards,
                                        Bob Crable
                                        Engineering Aide
                                        Research Instruments
                                        Electronics Shop
                                        Chemistry Department
                                        Penn State University



From Unknown Sun Dec 17 15:39:58 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!EU.net!peer-news.britain.eu.net!demon!thegle.demon.co.uk
From: [e-mail] (T H Bratton)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Drilling PC boards
Date: Sat, 16 Dec 1995 13:02:04 GMT
Lines: 20
Message-ID: <[e-mail]>
References: <[e-mail]> <4a53br$[e-mail]> <[e-mail]> <4ase2j$[e-mail]>
NNTP-Posting-Host: thegle.demon.co.uk
X-NNTP-Posting-Host: thegle.demon.co.uk
X-Newsreader: Forte Agent .99b.112

[e-mail] (Robert Crable) wrote:


>  I work in an electronics shop where people need small boards (less than
>8.5 x 11 inches) quickly and often, and we got tired of drilling them by
>hand, with the problems of connectors that wouldn't go in holes, missing
>holes in ground planes since they're hard to see, etc., so we built
>ourselves a machine to drill the holes for us. .......


>  If anyone would like more details they can post to here and I'll see
>what I can do.
>
Bob,

Sounds brilliant!    Yes, please post details.

Tom.



From Unknown Sun Dec 17 15:39:59 1995
Path: news.epix.net!news.sprintlink.net!news.dpc.net!news.heurikon.com!news.ahc.ameritech.com!ddsw1!news.mcs.net!chi-news.cic.net!newsfeed.internetmci.com!in1.uu.net!news.micron.net!cs018p05.boi.micron.net!user
From: [e-mail] (Russ Ellsworth)
Newsgroups: rec.radio.amateur.homebrew
Subject: Ferrite Rod..Filament Choke
Date: Thu, 14 Dec 1995 18:41:01 -0700
Organization: Alster Communications
Lines: 6
Message-ID: <[e-mail]>
NNTP-Posting-Host: cs018p05.boi.micron.net

I am trying to find ferrite rod to make a filament choke for a 4-1000A Amp
for 160 meters. Ferrite rod used to be easy to find but not anymore. I
have tried Palomar Engrs., Amidon, and some industrial sources..nobody has
rod, only toroids/beads/binocular cores, etc. Any ideas out there?? Maybe
in your stock of treasures?? Thanks
Russ Ellsworth  WA6CWV..Boise, Idaho


From Unknown Sun Dec 17 15:40:00 1995
Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!news.jersey.net!news.win.bright.net!brutus.bright.net!chi-news.cic.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!usenet
From: "C. J. Hawley Jr." <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ferrite Rod..Filament Choke
Date: Thu, 14 Dec 1995 23:05:14 -0600
Organization: University of Illinois, Urbana-Champaign
Lines: 20
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ruger-18.slip.uiuc.edu
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b3 (Win95; I)
To: Russ Ellsworth <[e-mail]>

Russ Ellsworth wrote:
>
> I am trying to find ferrite rod to make a filament choke for a 4-1000A Amp
> for 160 meters. Ferrite rod used to be easy to find but not anymore. I
> have tried Palomar Engrs., Amidon, and some industrial sources..nobody has
> rod, only toroids/beads/binocular cores, etc. Any ideas out there?? Maybe
> in your stock of treasures?? Thanks
> Russ Ellsworth  WA6CWV..Boise, Idaho

Nebraska Sales, 1-800-244-4567 about $35 for the wound 8 inch choke, and $12 for
the plain 8 inch #43mix rod.
--


Charles Jack Hawley Jr.
Amateur Radio KE9UW (A.K.A. 'Chuck' in Ham Radio)
BMW K100RS, BMWMOA #224 (A.K.A. 'Jack' in Motorcycles)
[e-mail]
Sr. Research Engineer Emeritus
Univ of Ill, Urbana-Champaign


From Unknown Sun Dec 17 15:40:01 1995
Path: news.epix.net!news.sprintlink.net!braintree!news.av.qnet.com!news.qnet.com!news3.net99.net!news.cais.net!primus.ansouth.net!news.internetMCI.com!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ferrite Rod..Filament Choke
Date: 15 Dec 1995 10:44:49 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 12
Sender: [e-mail]
Message-ID: <4as55h$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <[e-mail]>, "C. J. Hawley Jr."
<[e-mail]> writes:

>Nebraska Sales, 1-800-244-4567 about $35 for the wound 8 inch choke, and
$12
>for
>the plain 8 inch #43mix rod.

Or you could go to Ameritron or another amp builder and buy them much
cheaper!

73 Tom


From Unknown Sun Dec 17 15:40:02 1995
Path: news.epix.net!uunet!in2.uu.net!hearye.mlb.semi.harris.com!babylon5.ccd.harris.com!not-for-email
From: [e-mail] (Doug Snowden)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ferrite Rod..Filament Choke
Date: 15 Dec 1995 08:22:49 -0500
Organization: Harris Controls Division
Lines: 29
Message-ID: <4arsr9$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: rs2.ccd.harris.com
X-Newsreader: TIN [version 1.2 PL2]

C. J. Hawley Jr. ([e-mail]) wrote:
: Russ Ellsworth wrote:
: >
: > I am trying to find ferrite rod to make a filament choke for a 4-1000A Amp
: > for 160 meters. Ferrite rod used to be easy to find but not anymore. I
: > have tried Palomar Engrs., Amidon, and some industrial sources..nobody has
: > rod, only toroids/beads/binocular cores, etc. Any ideas out there?? Maybe
: > in your stock of treasures?? Thanks
: > Russ Ellsworth  WA6CWV..Boise, Idaho


Amidon does have ferrite rod. I just bought 2 8" rods about a month ago.
Doug, N4IJ

: Nebraska Sales, 1-800-244-4567 about $35 for the wound 8 inch choke, and $12 for
: the plain 8 inch #43mix rod.
: --


: Charles Jack Hawley Jr.
: Amateur Radio KE9UW (A.K.A. 'Chuck' in Ham Radio)
: BMW K100RS, BMWMOA #224 (A.K.A. 'Jack' in Motorcycles)
: [e-mail]
: Sr. Research Engineer Emeritus
: Univ of Ill, Urbana-Champaign
--
Doug  Snowden
[e-mail]



From Unknown Sun Dec 17 15:40:03 1995
Path: news.epix.net!news.sprintlink.net!wizard.pn.com!Germany.EU.net!howland.reston.ans.net!newsfeed.internetmci.com!chi-news.cic.net!news.compuserve.com!news.production.compuserve.com!news
From: Robert  H°yvald <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,uk.radio.amateur
Subject: For Sale TM-742a w/UT-50
Date: 15 Dec 1995 19:17:29 GMT
Organization: CompuServe, Inc. (1-800-689-0736)
Lines: 12
Message-ID: <4ashk9$ght$[e-mail]>
Xref: news.epix.net rec.radio.amateur.antenna:17745 rec.radio.amateur.equipment:22624 rec.radio.amateur.homebrew:12178 rec.radio.amateur.misc:95653 uk.radio.amateur:9665

To all:

I have a Kenwood TM-742a for sale right out of the box with all
docs and warranties. It is only three months old . Included is the
DFK-7 kit, TSU-7 decoder, and the UT50s module for the extra 50mhz
band, and the Comet SSB-15 tribander antenna as a complete package
for $900.00 plus shipping. There is absolutely nothing wrong with
this unit and the accessories, it has very little TX time less
than an hour, and receive of not more than three hours.

Please E-mail all inquiries to 72242,477
KB2UWJ


From Unknown Sun Dec 17 15:40:04 1995
Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!swrinde!howland.reston.ans.net!usc!chi-news.cic.net!nntp.coast.net!news.kei.com!news.ssd.intel.com!chnews!vegas.ch.intel.com!cmoore
From: [e-mail] (Cecil A. Moore~)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ham stores/Chicago, 500W dummy load
Date: 14 Dec 1995 17:14:09 GMT
Organization: Intel Corporation, Chandler, AZ
Lines: 14
Distribution: world
Message-ID: <4apm11$[e-mail]>
References: <4akgih$[e-mail]>
NNTP-Posting-Host: vegas.ch.intel.com
Keywords: Dummy load ham stores
X-ORIGINAL-NEWSGROUPS: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc

In article <4akgih$[e-mail]>,
Gilbert Gwilliam <[e-mail]> wrote:
>I am a non-ham who needs to buy a 500 W dummy load (for 13.56 MHz,
>preferably with a BNC connector) for an experiment in an industrial
>setting.  Needless to say, I need this soon (like tomorrow).  Can anyone
>tell me a ham store in the Chicago area (North/West would be preferable
>but not required) or a mail-order outfit that would be able to supply
>this item quickly?

Fair Radio Sales has an SWR/Power meter, ME165/G, with a built-in
50 ohm 600w dummy load. Used/poor $25, Used/good $45, Unused $125.
Their phone number is [phone] in Lima, Ohio.

73, Cecil, KG7BK, OOTC  (not speaking for my employer)


From Unknown Sun Dec 17 15:40:05 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!soap.news.pipex.net!pipex!dish.news.pipex.net!pipex!bt!btnet!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!zombie.ncsc.mil!blackbird.afit.af.mil!news.usafa.af.mil!usenet
From: [e-mail] (Shortwave Dave)
Newsgroups: rec.radio.amateur.homebrew
Subject: Heathkit HW-8 on SSB?
Date: Fri, 15 Dec 1995 16:20:27 GMT
Organization: United States Air Force Academy
Lines: 14
Message-ID: <4as7e3$[e-mail]>
NNTP-Posting-Host: dfl52.usafa.af.mil
X-Newsreader: Forte Free Agent 1.0.82


When cleaning out my shack, I exhumed my old HW-8.  Hasn't had any
voltage running through it in years.  Nostalgia!  As I played around
with my HW-8, I recalled a relatively simple SSB oscillator module
that 73 magazine did an article on maybe 2-4 years ago.  Hmm...

Anybody ever tried to go SSB using the venerable HW-8 as a basis?
Anyone got any suggestions or observations on the  propsects of such a
modification?

Thanks for any thoughts or comments.

-- Dave.



From Unknown Sun Dec 17 15:40:05 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Tim Hynde ka8ddz/qrp Rochester, MI )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Heathkit HW-8 on SSB?
Date: 16 Dec 1995 15:01:16 GMT
Organization: Netcom
Lines: 15
Message-ID: <4aumvs$[e-mail]>
References: <4as7e3$[e-mail]>
NNTP-Posting-Host: ix-pon-mi4-07.ix.netcom.com

>Anybody ever tried to go SSB using the venerable HW-8 as a basis?
>Anyone got any suggestions or observations on the  propsects of such a
>modification?
>
>Thanks for any thoughts or comments.
>
>-- Dave.

There are two circuits in the W1FB QRP notebook which provide for DSB
generation. I imagine you could put such a circuit before the P.A in
the HW-8. Very simple, a 741 and a few parts.

Regards,

Tim Hynde, ka8ddz


From Unknown Sun Dec 17 15:40:06 1995
Path: news.epix.net!uunet!in2.uu.net!news.sprintlink.net!cs.utexas.edu!news.eas.asu.edu!noao!math.arizona.edu!news.Arizona.EDU!usenet
From: [e-mail] (Joseph M. Miller, M.D.)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help Needed: Expert Hackers only (long)
Date: Thu, 14 Dec 95 09:38:34 MST
Organization: Dept. of Ophthalmology, University of Arizona
Lines: 17
Message-ID: <4apips$[e-mail]>
References: <4a799h$[e-mail]> <4abce3$[e-mail]>
NNTP-Posting-Host: mred.eyes.arizona.edu
Mime-Version: 1.0
X-Newsreader: WinVN 0.93.6

In article <4abce3$[e-mail]>, [e-mail] says...
located at the patient's chest, at the sternum, and held in place there
by
>>a bra-like attachment garment. The garment features a pocket or holster
in


I question what is being monitored.  In most monitoring applications
signal loss is of interest.  Intentional patient defeat of systems
intended for their benefit (eg: holter monitoring of EKG) is not an
issue.  Before I through in my 0.02, is the variable being monitored
being used to keep someone from escaping something?

My paranoid nature comes through again.





From Unknown Sun Dec 17 15:40:07 1995
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.msfc.nasa.gov!pendragon!ames!waikato!news.massey.ac.nz!sysadmin
From: [e-mail] (Malcolm Loudon)
Newsgroups: rec.radio.amateur.homebrew
Subject: Help! S-AU21 UHF power brick
Date: 14 Dec 1995 21:46:19 GMT
Organization: Massey University
Lines: 11
Message-ID: <4aq5vb$[e-mail]>
NNTP-Posting-Host: ps-pc64.massey.ac.nz
X-Newsreader: WinVN 0.92.6+

Hi,

I have recently come across some Toshiba S-AU21
10W 860MHz power modules. Does anyone have any
technical specs for these little beasties ? I
especially need to know the pin out. Any info
would be greatly appreciated.

Regards,

Malcolm


From Unknown Sun Dec 17 15:40:08 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (JCHol)
Newsgroups: rec.radio.amateur.homebrew
Subject: Henry 2K-3 HF amp; adding 160 meter capability
Date: 13 Dec 1995 20:23:02 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 4
Sender: [e-mail]
Message-ID: <4anu9m$[e-mail]>
Reply-To: [e-mail] (JCHol)
NNTP-Posting-Host: newsbf02.mail.aol.com

Can you help me with this conversion?  I am looking for people who have
done the  conversion successfully! Or , lessons learned....

Thanks de John, WA5TWL


From Unknown Sun Dec 17 15:40:09 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!newsxfer.itd.umich.edu!news.mtu.edu!msunews!netnews.upenn.edu!news.drexel.edu!dunx1.ocs.drexel.edu!st92ba44
From: [e-mail] (Antonio Gatta)
Newsgroups: rec.radio.amateur.homebrew
Subject: homebrew FM radio.. need help
Date: 10 Dec 1995 23:49:05 GMT
Organization: Drexel University, Philadelphia
Lines: 14
Message-ID: <4afrlh$[e-mail]>
NNTP-Posting-Host: dunx1.ocs.drexel.edu

Hello.

Could someone point me in the right direction?  I'm looking to built a
(hopefully simple) FM receiver that is channel specific.  I'd like a little
breadboard project that picks up .. say .. the 90-100 MHz FM range.

I've done alot with shortwave/AM radios, but never've really fooled with
FM.

Good places to find schematics for FM projects?

thanks in advance,
-tony.



From Unknown Sun Dec 17 15:40:10 1995
Path: news.epix.net!news.sprintlink.net!news.dpc.net!news.heurikon.com!news.ahc.ameritech.com!ddsw1!news.mcs.net!van-bc!news.mindlink.net!agate!howland.reston.ans.net!EU.net!peer-news.britain.eu.net!demon!mail2news.demon.co.uk!lfheller.demon.co.uk
From: Leon Heller <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: homebrew FM radio.. need help
Date: Fri, 15 Dec 95 18:35:40 GMT
Organization: Home
Lines: 23
Message-ID: <[e-mail]>
References: <4afrlh$[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: lfheller.demon.co.uk
X-Newsreader: Demon Internet Simple News v1.29

In article <4afrlh$[e-mail]>
           [e-mail] "Antonio Gatta" writes:

> Hello.
>
> Could someone point me in the right direction?  I'm looking to built a
> (hopefully simple) FM receiver that is channel specific.  I'd like a little
> breadboard project that picks up .. say .. the 90-100 MHz FM range.
>
> I've done alot with shortwave/AM radios, but never've really fooled with
> FM.
>
> Good places to find schematics for FM projects?

The Philips TDA7000 is probably the easiest way to do this - you just
need the one chip (plus some other components, of course).

Leon
--
Leon Heller, G1HSM                | "Do not adjust your mind, there is
E-mail [e-mail]  |  a fault in reality": on a wall
Phone: [phone]         |  many years ago in Oxford.


From Unknown Sun Dec 17 15:40:11 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!newsfeed.internetmci.com!in1.uu.net!inews.intel.com!itnews.sc.intel.com!fmsu03.fm.intel.com!mcd1.fm.intel.com!usenet
From: "Ken (KC6TEU)" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: How to add AGC to a Tube Radio?? (Swan 250)
Date: 11 Dec 1995 22:42:43 GMT
Organization: Intel Corporation, Folsom CA, USA
Lines: 23
Message-ID: <4aic53$[e-mail]>
References: <495ui8$[e-mail]> <49hph7$[e-mail]> <49t4fn$[e-mail]> <4a07jb$[e-mail]> <4a5dke$[e-mail]> <4aiaoc$[e-mail]>
NNTP-Posting-Host: kmasonpc.fm.intel.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 32bit)

All,

What is the best way to add AGC capability to the SWAN 250
radio? This radio has no AGC, so when I am listening to a weak
signal during a contest my ears will get blown out by a local
contester!

This is a tube type radio. I figure a feedback from the audio
output to the audio amplifier input could do it. Is there any
other ideas or designs on how to do an AGC on a tube radio
like the Swan 250?

I've got the radio for free, so don't tell me to buy a new
radio. I simply can't afford it!


               Thanks,

                Ken R. Mason
                KC6TEU
                CM98LQ
                [e-mail]



From Unknown Sun Dec 17 15:40:12 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.dpc.net!news.heurikon.com!uwvax!uwm.edu!spool.mu.edu!howland.reston.ans.net!newsfeed.internetmci.com!iglou!n4lq
From: [e-mail] (Steve Ellington)
Subject: Re: How to add AGC to a Tube Radio?? (Swan 250)
X-Nntp-Posting-Host: iglou.com
Message-ID: <[e-mail]>
Sender: [e-mail] (News Administrator)
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References: <495ui8$[e-mail]> <49hph7$[e-mail]> <49t4fn$[e-mail]> <4a07jb$[e-mail]> <4a5dke$[e-mail]> <4aiaoc$[e-mail]> <4aic53$[e-mail]>
Date: Fri, 15 Dec 1995 01:07:51 GMT
Lines: 28

The 250 had agc. Maybe you're expecting too much. AGC controls the gain
of the IF stages based on the strength of the signal at the detector.
This is before it even reaches the audio section. You should normally
operate with the RF gain control turned all the way up (if it has one)
and  adjust the audio gain for a comfortable level. When strong signals
are tuned in, the sensitivity of the radio should automatically decrease
and prevent the IF amplifiers from overloading. Volume may increase some
anyway since AGC does not regulate the actual audio amplifiers gain.


: This is a tube type radio. I figure a feedback from the audio
: output to the audio amplifier input could do it. Is there any
: other ideas or designs on how to do an AGC on a tube radio
: like the Swan 250?

: I've got the radio for free, so don't tell me to buy a new
: radio. I simply can't afford it!


:                Thanks,

:                 Ken R. Mason
:                 KC6TEU
:                 CM98LQ
:                 [e-mail]

--
Steve Ellington [e-mail]  Louisville, Ky


From Unknown Sun Dec 17 15:40:13 1995
Path: news.epix.net!news.sprintlink.net!nntp.news.primenet.com!news.primenet.com!ctrask
From: [e-mail] (Christopher Trask)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How to add AGC to a Tube Radio?? (Swan 250)
Date: 16 Dec 1995 01:38:41 -0700
Organization: Primenet [phone]
Lines: 46
Sender: [e-mail]
Message-ID: <4au0ih$[e-mail]>
References: <495ui8$[e-mail]> <49hph7$[e-mail]> <49t4fn$[e-mail]> <4a07jb$[e-mail]> <4a5dke$[e-mail]> <4aiaoc$[e-mail]> <4aic53$[e-mail]>
X-Posted-By: [e-mail]
X-Newsreader: TIN [version 1.2 PL2]

Ken (KC6TEU) ([e-mail]) wrote:
: All,

: What is the best way to add AGC capability to the SWAN 250
: radio? This radio has no AGC, so when I am listening to a weak
: signal during a contest my ears will get blown out by a local
: contester!

: This is a tube type radio. I figure a feedback from the audio
: output to the audio amplifier input could do it. Is there any
: other ideas or designs on how to do an AGC on a tube radio
: like the Swan 250?

: I've got the radio for free, so don't tell me to buy a new
: radio. I simply can't afford it!


        Ah!  Winter is here and the tubes are coming out of the closets.

        For a vacuum tube receiver, AGC (and MGC) is implemented by ad-
justing the voltage on the control grid(s) of the IF amplifier and RF
amplifier stages.  For the most part, pentodes (three grids) were used
for this function as the transconductance curve is more linear.
Variable-u pentodes like the 6AU6, 6BA6, and 6AK5 (my favourite) were
very widely used, so look for something like this in the radio.  The
AGC voltage is derived by rectifying the audio, and then conditioning it
as required to achieve the desired results.
        There were a number of variable attack- and delay-time AGC
circuits in the ARRL handbooks of the 60's and early 70's (vacuum tube,
of course) and undoubtedly solid-state versions in later years.  You might
want to stay with vacuum tube solutions because of the voltages.  And, of
course, because you are a purist.
        You <ARE> a purist, aren't you (HI)?


--
                                          Regards,

                                          Chris

------------------------------------------------------------------------------
Chris Trask / N7ZWY                       Circuit Design for the RF Impaired
ATG Design Services                       __  __     ____  ___       ___ ____
[e-mail]       _~_            /__)/__) / / / / /_  /\  / /_    /
                         (@ @)          /   / \  / / / / /__ /  \/ /___  /
----------------------ooO~(_)~Ooo---------------------------------------------


From Unknown Sun Dec 17 15:40:15 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!newsjunkie.ans.net!Rezonet.net!news.pubnix.net!mba!juxta!michael.black
From: [e-mail] (Michael Black)
Date: 16 Dec 95 12:49:34
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How to add AGC to a Tube Radio?? (Swan 250)
Message-ID: <[e-mail]>
Organization: MtlNet (MBA.org)
Lines: 22

Apparently (I missed the original post) somebody acquired a
Swan 250 and wants to add agc to it, or something like that.

Somebody has already said that the rig has AGC.  I assume that's
correct, because I can't imagine it not having AGC.  On the other
hand, in the early days of the Swan rigs there were articles in
the ham magazines about adding AGC and/or improving it.  The details
are fuzzy, and I'm not into searching right now.  I'd say that
the very earliest Swan rigs must have needed improvement in the
AGC department.  The later rigs, I'm not so sure.  THere were plenty
of articles about modifying the Swan 250, but again I can't recall
the details so I couldn't say whether people at the time deemed it
to be lacking in good agc.  The problem of the original poster might
be that it wasn't a good implementation (there were variations on
the 250 over it's life;  the number remained the same but a letter
was added at the end), or that in his particular rig the there's
a problem in his agc that needs repairing.

       Michael  VE2BVW
--
| Return Address:      [e-mail]
| Standard disclaimer: The views of this user are strictly their own.


From Unknown Sun Dec 17 15:40:16 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.dacom.co.kr!news.uoregon.edu!kaiwan.kaiwan.com!kaiwan-internet
From: [e-mail] (James A. Henderson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How to add AGC to a Tube Radio?? (Swan 250)
Date: 16 Dec 1995 14:15:12 -0800
Organization: KAIWAN INTERNET 714-260-8800 (We cover 909,714,310,213,818,805 areas)
Lines: 53
Message-ID: <4avgdg$[e-mail]>
References: <495ui8$[e-mail]> <4aiaoc$[e-mail]> <4aic53$[e-mail]> <4au0ih$[e-mail]>
NNTP-Posting-Host: kaiwan009.kaiwan.com

In article <4au0ih$[e-mail]>,
Christopher Trask <[e-mail]> wrote:
>Ken (KC6TEU) ([e-mail]) wrote:
>: All,
>
>: What is the best way to add AGC capability to the SWAN 250
>: radio? This radio has no AGC, so when I am listening to a weak
>: signal during a contest my ears will get blown out by a local
>: contester!
>
>: This is a tube type radio. I figure a feedback from the audio
>: output to the audio amplifier input could do it. Is there any
>: other ideas or designs on how to do an AGC on a tube radio
>: like the Swan 250?
>
>: I've got the radio for free, so don't tell me to buy a new
>: radio. I simply can't afford it!
>
>
>       Ah!  Winter is here and the tubes are coming out of the closets.
>
>       For a vacuum tube receiver, AGC (and MGC) is implemented by ad-
>justing the voltage on the control grid(s) of the IF amplifier and RF
>amplifier stages.  For the most part, pentodes (three grids) were used
>for this function as the transconductance curve is more linear.
>Variable-u pentodes like the 6AU6, 6BA6, and 6AK5 (my favourite) were
>very widely used, so look for something like this in the radio.  The
>AGC voltage is derived by rectifying the audio, and then conditioning it
>as required to achieve the desired results.
>       There were a number of variable attack- and delay-time AGC
>circuits in the ARRL handbooks of the 60's and early 70's (vacuum tube,
>of course) and undoubtedly solid-state versions in later years.  You might
>want to stay with vacuum tube solutions because of the voltages.  And, of
>course, because you are a purist.
>       You <ARE> a purist, aren't you (HI)?
>
>
>--
>                                         Regards,
>
>                                         Chris
>
>------------------------------------------------------------------------------
>Chris Trask / N7ZWY                       Circuit Design for the RF Impaired
>ATG Design Services                       __  __     ____  ___       ___ ____
>[e-mail]       _~_            /__)/__) / / / / /_  /\  / /_    /
>                         (@ @)          /   / \  / / / / /__ /  \/ /___  /
>----------------------ooO~(_)~Ooo---------------------------------------------

--
==================================================================
The Cottage Consultancy..
    ..where the rubric meets the rote!                 ..de N6LV


From Unknown Sun Dec 17 15:40:17 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.dacom.co.kr!news.uoregon.edu!kaiwan.kaiwan.com!kaiwan-internet
From: [e-mail] (James A. Henderson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How to add AGC to a Tube Radio?? (Swan 250)
Date: 16 Dec 1995 14:36:44 -0800
Organization: KAIWAN Internet (310-527-4279,818-756-0180,909-785-9712,714-638-4133,805-294-9338)
Lines: 30
Message-ID: <4avhls$[e-mail]>
NNTP-Posting-Host: kaiwan009.kaiwan.com

>
>       For a vacuum tube receiver, AGC (and MGC) is implemented by ad-
>justing the voltage on the control grid(s) of the IF amplifier and RF
>amplifier stages.  For the most part, pentodes (three grids) were used
>for this function as the transconductance curve is more linear.
>Variable-u pentodes like the 6AU6, 6BA6, and 6AK5 (my favourite) were
>very widely used, so look for something like this in the radio.  The
>AGC voltage is derived by rectifying the audio, and then conditioning it
>as required to achieve the desired results.

If memory serves, the 6AU6 and 6AK5 of the above trio are sharp cut-off
pentodes.  Application of AGC to these tubes may result in a harsh AGC
characteristic and some interesting overload effects.  It can be done,
however.

>       There were a number of variable attack- and delay-time AGC
>circuits in the ARRL handbooks of the 60's and early 70's (vacuum tube,
>of course) and undoubtedly solid-state versions in later years.  You might
>want to stay with vacuum tube solutions because of the voltages.

Back in the days of the Swan SW140/SW120 AGC-less tranceivers the guys
used to full-wave rectify the secondary of the audio output transformer
and apply the negative voltage to an ad hoc AGC bus connected to the DC
returns of the i.f.  amplifier control grids.  It sounded harsh, but
worked well.

--
==================================================================
The Cottage Consultancy..
    ..where the rubric meets the rote!                 ..de N6LV


From Unknown Sun Dec 17 15:40:18 1995
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!howland.reston.ans.net!EU.net!peer-news.britain.eu.net!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How to add AGC to a Tube Radio?? (Swan 250)
Date: Sat, 16 Dec 95 06:14:42 GMT
Lines: 13
Message-ID: <[e-mail]>
References: <495ui8$[e-mail]> <49hph7$[e-mail]> <49t4fn$[e-mail]> <4a07jb$[e-mail]> <4a5dke$[e-mail]> <4aiaoc$[e-mail]> <4aic53$[e-mail]> <[e-mail]>
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X-Newsreader: News Xpress Version 1.0 Beta #4

   [e-mail] (Steve Ellington) wrote:

>The 250 had agc. Maybe you're expecting too much. AGC controls the gain
>of the IF stages based on the strength of the signal at the detector.

I'm not familiar with the 250's specific AGC circuit, but older rigs
often didn't have the control range we expect by today's standards.
Maybe it's not working.  Is the S-meter moving?

73,
Jack  WB3U



From Unknown Sun Dec 17 15:40:19 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: HW 8  HW9
Date: 13 Dec 95 22:15:00 GMT
Organization: ucsd usenet gateway
Lines: 6
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

I need an hw8 working would be great but as long as the front end works I
could use it . Also intersested in HW9 with warc bands.

Thanks

Vic wm3b


From Unknown Sun Dec 17 15:40:20 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!chi-news.cic.net!news.compuserve.com!news.production.compuserve.com!news
From: curtis epps <[e-mail]>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.swap
Subject: I.D. Timers
Date: 14 Dec 1995 22:04:43 GMT
Organization: CompuServe, Inc. (1-800-689-0736)
Lines: 18
Message-ID: <4aq71r$2jn$[e-mail]>
Xref: news.epix.net rec.radio.amateur.antenna:17698 rec.radio.amateur.equipment:22555 rec.radio.amateur.homebrew:12136 rec.radio.amateur.misc:95594 rec.radio.swap:53056

I.D. Timers:  Battery powered quartz countdown timer with alarm.
Auto re-set/auto re-start for no
touch opperation and no loss in time between ten minute ID cycles
with the auto re-start.  L.C.
display shows minutes remaining in countdown.  High acuracy less
than +4 seconds per week
of continuous duty.  Aprox 2 1/2 x 2 1/2 x 1/2 inches; watch
battery included.
Timer has spring loaded magnetic clip for dash board or visor
mounting for mobil use, swing
down metal bail converts clip to easel stand for base opperation.
 Timers sold nationally for
$35.00.  Special price $20.00 shiped UPS ground.  Checks OK.
Curtis Epps (KB4WUB) 1553
Mackerel Ave.-Sarasota, FL 34237

--
C.EPPS


From Unknown Sun Dec 17 15:40:21 1995
Path: news.epix.net!news.sprintlink.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!in2.uu.net!news.iadfw.net!usenet
From: [e-mail] (Kerry Miller)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Info on QRP kits and QRP rigs
Date: Fri, 15 Dec 1995 22:00:04 GMT
Organization: Internet America
Lines: 36
Message-ID: <4asr6b$[e-mail]>
References: <Pine.SOL.3.91.951214113457.27425A-100000@coinc0>
NNTP-Posting-Host: dal05-21.ppp.iadfw.net
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Drew Wilson) wrote:

>I'm interested in getting into HF QRP and would like to start with a kit
>or complete hombrew rig. My problem is that I can't find current
>schematics for into-level rigs or a quality kit manufacturer. Could
>anyone suggest a good entry point into HF homebrew and QRP?

>73 -- drew

>Drew Wilson
>ARS KB0QIA
>[e-mail]

Drew,
     73 Magazine had a couple of real neat transmitters a few years
ago, 1 - 40m and 1 - 80m.  I built the 40m, about 3/4 watt, not many
contacts but fun to build.  Don't have a scanner, but if you are
interesed I could mail you a photocopy of the schematic.  They use
nand gates for oscillators and 2 or 3 2n2222's in the final.  Real
simple, mine even worked the first time I turned it on!
Kerry Miller
[e-mail]



The Voice of Union Valley and All Right-Thinking People of East Texas!

                                 \\\
                                 (  )
                                ( oo )
             |--------------ooOO--()--OOoo--------------|
             | Kerry Miller              Royse City, TX |
             |                                          |
             |                  WD5ABC                  |
             |------------------------------------------|



From Unknown Sun Dec 17 15:40:22 1995
Path: news.epix.net!news.sprintlink.net!news.heurikon.com!uwvax!uwm.edu!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!galaxy.ucr.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Drew Wilson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Info on QRP kits and QRP rigs
Date: 14 Dec 95 17:44:52 GMT
Organization: ucsd usenet gateway
Lines: 11
Message-ID: <Pine.SOL.3.91.951214113457.27425A-100000@coinc0>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

I'm interested in getting into HF QRP and would like to start with a kit
or complete hombrew rig. My problem is that I can't find current
schematics for into-level rigs or a quality kit manufacturer. Could
anyone suggest a good entry point into HF homebrew and QRP?

73 -- drew

Drew Wilson
ARS KB0QIA
[e-mail]



From Unknown Sun Dec 17 15:40:23 1995
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!geraldo.cc.utexas.edu!usenet
From: [e-mail] (Larry Braden)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Info on QRP kits and QRP rigs
Date: 17 Dec 1995 03:13:15 GMT
Organization: University of Texas at Austin
Lines: 29
Message-ID: <4b01sb$[e-mail]>
References: <Pine.SOL.3.91.951214113457.27425A-100000@coinc0>
NNTP-Posting-Host: slip-43-12.ots.utexas.edu
X-Newsreader: WinVN 0.92.6+

In article <Pine.SOL.3.91.951214113457.27425A-100000@coinc0>, [e-mail] (Drew Wilson) says:
>
>I'm interested in getting into HF QRP and would like to start with a kit
>or complete hombrew rig. My problem is that I can't find current
>schematics for into-level rigs or a quality kit manufacturer. Could
>anyone suggest a good entry point into HF homebrew and QRP?
>

Hi Drew,

You might try Kanga... here's the WWW site:

http://qrp.cc.nd.edu/kanga/

e-mail orders or inquiries to:
[e-mail]


US mail also works:
Kanga US
Bill Kelsey
3521 Spring Lake Dr.
Findlay, OH 45840

Bill N8ET runs Kanga US and it's a small business that he does part-time
out of his passion for ham radio, QRP, and building. Try the web site if
at all possible to see the catalog and prices, as well as ordering info.

73 KC5CWG Larry Braden


From Unknown Sun Dec 17 15:40:24 1995
From: [e-mail] (Doug Reed)
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!rosevax!hamlink!fredmail
Newsgroups: rec.radio.amateur.homebrew
Subject: Info On texscan al-51c
Message-ID: <[e-mail]>
Date: Sat, 16 Dec 1995 09:12:03 -0100
X-FTN-To: All
Lines: 17


I'm looking for a schematic or service manual or even operators manual
for a Texscan model AL-51C Spectrum Analyzer.  This is a cheap portable
model about 10-15 years old.  I also have a model AL-51A which I'll
probably try to fix or use for parts.  (Every switch in the AL-51C seems
to be dirty and I think the various stages have drifted with age.)

Does anybody have any info or know if the company still exists?  If you
have manuals, please estimate page count or duplication cost.  Thanks.

73's.    Doug Reed, N0NAS       email: [e-mail]
         2014 Radatz Ave        fax:   [phone]
         St Paul, MN  55109

 * SLMR 2.1a * hAS ANYONE SEEN MY cAPSLOCK KEY?




From Unknown Sun Dec 17 15:40:26 1995
Path: news.epix.net!uunet!in1.uu.net!spool.mu.edu!howland.reston.ans.net!usc!news.cerf.net!ni1.ni.net!usenet
From: [e-mail]
Newsgroups: soc.culture.venezuela,soc.culture.uruguay,soc.culture.spain,soc.culture.peru,soc.culture.mexican.american,soc.culture.latin-america,soc.culture.ecuador,soc.culture.cuba,soc.culture.colombia,soc.culture.chile,soc.culture.bolivia,soc.culture.argentina,rec.radio.amateur.policy,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.digital.misc,rec.radio.amateur.antenna
Subject: Ingrese Via Internet a las Repetidoras de California
Date: Fri, 15 Dec 95 09:04:49 PST
Organization: Network Intensive
Lines: 35
Message-ID: <[e-mail]>
NNTP-Posting-Host: miglia1.gmtech.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Xref: news.epix.net soc.culture.venezuela:43381 soc.culture.uruguay:4679 soc.culture.spain:83662 soc.culture.peru:11027 soc.culture.mexican.american:7900 soc.culture.latin-america:39857 soc.culture.ecuador:4269 soc.culture.cuba:31797 soc.culture.colombia:12539 soc.culture.chile:32380 soc.culture.bolivia:10745 soc.culture.argentina:28860 rec.radio.amateur.policy:32223 rec.radio.amateur.misc:95698 rec.radio.amateur.homebrew:12209 rec.radio.amateur.equipment:22661 rec.radio.amateur.digital.misc:13177 rec.radio.amateur.antenna:17776



RADIOAFICIONADOS

DX's VIA INTERNET CON LOS ANGELES CALIFORNIA

Es fantastico escuchar como radioaficionados de todas partes del mundo
utilizan los repetidores de VHF y UHF del sur de California (En Espanol)
ingresando por medio de INTERNET, ademas en muchas ocaciones nuestras maquinas
de 2 Metros, 220 Mhz, 440Mhz y 1.2 Ghz estuvieron interconectadas con maquinas
similares, por horas, en otras partes del mundo permitiendo realizar Dx's con
un pequeno equipo de mano.

Para realizar un INTERNET/REPEATER LINK con los repetidoras de habla hispana
de sur de California debes contar con los siguientes elementos:

- Cuenta en Internet del tipo PPP.
- Computador 486 DX2 66mhz 8 MB con tarjeta de sonido.
- Modem de 14,400 Bauds.
- Programa Iphone (Internet Phone: http://www.vocaltec.com).

Si ya estas listo o te hace falta ayuda envia un E-Mail a:

[e-mail]

Y adjunta los siguientes datos:

Letras/Call:
Nombre y Apellido:
Pais y Ciudad:
E-Mail:

73's de AC6RB George Migliarini




From Unknown Sun Dec 17 15:40:27 1995
Path: news.epix.net!uunet!in1.uu.net!genmagic!sgigate.sgi.com!swrinde!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (SPBellamy)
Newsgroups: rec.radio.amateur.homebrew
Subject: Interfacing Ranger RCI 2950 to transverter
Date: 13 Dec 1995 14:50:37 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 19
Sender: [e-mail]
Message-ID: <4anaqd$[e-mail]>
Reply-To: [e-mail] (SPBellamy)
NNTP-Posting-Host: newsbf02.mail.aol.com

I wish to get on 6 meters and the higher bands and am considering using
transverters like the type Down East Microwave sells.  I am wondering if
it is practical to buy a radio like the RCI 2950 Ranger, which is a
relatively cheap way to get an all-mode 10  meter rig, and use it as the
baseband or exciter  radio for a series of different transverters.
There are a number of ways to interface a radio to a transverter.  One way
would be to take the antenna output and run it through an attenuator to
supply the approx. 200 mw or less  drive that the transverter is
comfortable handling.   The attenuator would probably be switched out on
receive, but safeguard the transverter on transmit.
Another way would be to get low-level drive out of the IF section in the
Ranger.
I am sure there are folks out there that have done this and I would like
to have your thoughts on this project.  Do you have a Ranger radio?  Have
you brought out the drive from the IF?  How did you do it?  What is the
level of the drive signal?  Is there a transverter group on AOL or thwe
WWW?
Thanks and 73
AA8MX


From Unknown Sun Dec 17 15:40:28 1995
Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!howland.reston.ans.net!news.starnet.net!wupost!waikato!comp.vuw.ac.nz!central.co.nz!usenet
From: [e-mail]@central.co.nz (Barry Lennox)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Japanese 2SC380Y substitute ?
Date: 15 Dec 1995 10:39:43 GMT
Organization: Personal
Lines: 11
Message-ID: <4arj9f$[e-mail]>
References: <4ahigm$[e-mail]>
NNTP-Posting-Host: barryl.central.co.nz
X-Newsreader: WinVN 0.99.7

In article <4ahigm$[e-mail]>, [e-mail] says...
>
>What is a substitute for the 2SC380Y ? Would a 2N2222 work ? They are
>both npn, but I don't know if the specs are close enough...

The 2SC380 is NPN, described as a FM/Amp/Mixer/Osc for use up to 250 Mhz.
Suggested replacements are: BF 240/241/254/255/594/595. A 2N2369A or 2N2222
should be OK, depending on the application.

Barry Lennox



From Unknown Sun Dec 17 15:40:29 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!EU.net!peer-news.britain.eu.net!demon!crok.demon.co.uk!Crok
From: [e-mail] (Stephen Crocker)
Newsgroups: sci.electronics.design,sci.electronics,sci.electronics.basic,sci.electronics.misc,rec.radio.amateur.homebrew
Subject: Re: LCD counter module??
Date: Fri, 15 Dec 1995 17:22:35 +0100
Organization: Crokk
Lines: 25
Distribution: world
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References: <4ab0v6$[e-mail]>
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Xref: news.epix.net sci.electronics.design:517 sci.electronics:162576 rec.radio.amateur.homebrew:12176

Before being shot for writing article <4ab0v6$[e-mail]>, David Mulligan wrote:

> I can swear I saw an LCD counter module at work today in a test jig.  Since
> I  have  no  idea  who  builds  them, and as I rarely get to the production
> building at work I will probably not find out that way for a while :(
>
> Anyways  my  question  is  are  there any LCD counter modules with external
> reset?  Well what I am trying to achive is a frequency counter, basically I
> need  the  each  digit  to act like a cascading decade counter, to be reset
> once a second, 10 times a second etc...  Or is there a better way?
>
> Thanks a bunch....
>
> David
> [e-mail]

There is one available from Maplin.

--
 x^      ( )      _________         //
<       U O      |_|_|_|_|_|    O  ||
 \,     |/|\      _________       [  ]
     .  |/^\  .       2       .   /__\
... I am what I am and that's all that I am


From Unknown Sun Dec 17 15:40:30 1995
Path: news.epix.net!uunet!in2.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!SantaFe!usenet
From: Rudy <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Lowest PC Memory Prices!
Date: Wed, 13 Dec 1995 18:50:46 -0700
Organization: Atomic City Electronics
Lines: 15
Message-ID: <[e-mail]>
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Mime-Version: 1.0
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High Sales Volume = Lowest Prices!

Because of high volume sales to the US Government, State
Government, and National Laboratories, Atomic City Electronics,
Inc. of Los Alamos, New Mexico is offering PC memory at
outstanding prices:

4 MB  (1X32) $129.95
8 MB  (2X32) $249.95
16 mb (4x32) $479.95

All are new NP 70 ns 72 pin Simms.

Call [phone]: Ask for Rudy.
FAX  [phone]: Attention Rudy.


From Unknown Sun Dec 17 15:40:32 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!sdd.hp.com!hplabs!hplextra!hplb!hpwin055.uksr!hpqmoea!dstock
From: [e-mail] (David Stockton)
Subject: Re: Measuring phase-noise with HP 8640B
Sender: [e-mail] (SQF News Admin)
Message-ID: <[e-mail]>
Date: Thu, 14 Dec 1995 17:26:44 GMT
References: <4akj87$[e-mail]>
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Richard Karlquist ([e-mail]) wrote:



: done it a number of times.  However, if you're going to go to the
: trouble of getting a crystal for each measurement frequency, you might
: as well use the crystal to make a VCXO, which is actually easier than
: making a filter.  You can then lock the VCXO to the source under test
: and look at the baseband noise with an audio spectrum analyzer (home
: brew 3048 architecture).


    Yes!   for testing a simple VFO or a complete synthesiser you need
only find a crystal within the tuning range and build a VCXO, or pick the
ends and centre of the range and build 3 VCXOs

    It should not be too difficult to get a cleaner crystal oscillator
than VFO or synth  for the sort of offset freq range that is of interest
for cw/ssb/etc modes that we use.

   Say $10 to put a VCXO together, a few dollars more for a mixer and a
loop amplifier.  3585's still fetch a fearsome second hand price, so the
50kHz range of the original 3580A looks rather tempting. For a really
cheapskate home phase noise measurement, an old telecomms selective level
meter or "wavemeter" amounts to a hand-cranked LF spectrum analyser  - I've
seen examples on sale at rallies for pocket money. The use of a step
attenuator and meter is a little tedious but may be somewhat more
accurate than a spectrum analyser. Arranging a sensible IF filter width
and integrating the filter shape to get its noise bandwidth need only be
done once.

    Commercial phase noise testers are fine if you have access to them
but may not be adequate for true state of the art work.

    8640 mixdown  will show up the problems with today's synthesisers
well enough, and begins to be affordable by individuals.

    VCXO mixdown will outperform the 8640 and threaten the commercial
tester, for an even lower price but is 1 freq per VCXO

    Mixdown of an identical pair of the devices under test can be
similarly cheap AND state of the art.


    The LF analyser is not a trivial matter for HF work. The HP3585 up
converts to a higher IF than you've just mixed down from, with a very
early frac-N synth. Tuned to VLF the phase noise sidebands of the synth
will leak into the IF, giving phase noise from the analyser modified by
the mixer drive level and the mixer balance....

   Sometimes you just don't win

   Still, I can't quite believe this sort of conversation is really
happening on this group.... and what I wrote for the ARRL seemed to start
it!

   Cheers
          David  GM4ZNX



From Unknown Sun Dec 17 15:40:34 1995
Path: news.epix.net!uunet!in1.uu.net!fdn.fr!jussieu.fr!univ-lyon1.fr!in2p3.fr!swidir.switch.ch!scsing.switch.ch!news.rccn.net!news.ist.utl.pt!alfa.ist.utl.pt!l38217
From: [e-mail] (Pedro Pedroso)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need Keyer !!
Date: 13 Dec 1995 17:47:58 GMT
Organization: Instituto Superior Tecnico
Lines: 21
Message-ID: <4an3ke$[e-mail]>
NNTP-Posting-Host: alfa.ist.utl.pt
X-Newsreader: TIN [version 1.2 PL2]


                I am going to buy a Bencher Paddle and my transceiver
        has no Keyer! Since the keyers avaiable here in Portugal are
        a bit expensive, I wonder if anyone has a nice circuit diagram
        + PCB design of a keyer for my Bencher (with Iambic capabilities
        obviously).
        Thank you very much!

                                        Best 73 + Good DX + MRY CHS



--


 | Pedro Pedroso                |                            |
 | [e-mail]       |  CT1ELP                    |
 | Eng. Electrotecnica e Comp.  |  Founder member of GPDX    |
 | (Telecomunicacoes e electronica)                          |
 -------------------------------------------------------------



From Unknown Sun Dec 17 15:40:35 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!usenet.eel.ufl.edu!newsfeed.internetmci.com!idir.net!idts1lw19.idir.net!user
From: [e-mail] (gloria medcalf)
Newsgroups: rec.radio.amateur,rec.radio.amateur.antenna,rec.radio.amateur.digital,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.packet,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.amateur.swap
Subject: New Ham Web Site with Information Content
Date: Thu, 14 Dec 1995 21:19:58 -0600
Organization: Internet Direct Communications - Lawrence, Ks - [phone]
Lines: 19
Message-ID: <[e-mail]>
NNTP-Posting-Host: idts1lw19.idir.net
Xref: news.epix.net rec.radio.amateur.antenna:17706 rec.radio.amateur.digital.misc:13130 rec.radio.amateur.equipment:22573 rec.radio.amateur.homebrew:12143 rec.radio.amateur.misc:95599 rec.radio.amateur.policy:32189 rec.radio.amateur.space:5950


A new ham radio related web site is on-line. It contains Articles
and Radio-TNC Wiring Diagrams.

URL: http://www.idir.net/~medcalf/ztx/

Current Articles

    Desense: Some Possible Solutions

    TOR Modes: Hearing the Difference (includes sound files)

    Getting Information from a Weathernode

I plan to add an article approximately once a month. These articles may
be reprinted in amateur radio club newsletters provided that credit is
given to the author.

73 gloria ka5ztx   [e-mail]


From Unknown Sun Dec 17 15:40:36 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news
From: Dave'Doc'Reid <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: New Keyer kit on 1" PCB
Date: 16 Dec 1995 11:54:13 GMT
Organization: D.R.Computer Products
Lines: 31
Message-ID: <4auc18$7vp$[e-mail]>

Hi there -

I have developed a small keyer kit - called the uKeyer
(microkeyer) It is a complete iambic micro keyer on a 1" PCB -
designed for use in Homebrew equipment.

Look out for it in your local magazines - will be reviewed in
RadCom in the UK - and hopefully in QST RSN.

It boasts the following features:

     5 to 50+ WPM
     Low power consumption (1uA in standby)
     Small size - 1" (25.4mm) square PCB
     TUNE button for 10 secs keydown
     stored CQ CQ DE <call> <call> AR PSE K at the press of a
button
     Dot/Dash memories
     low cost - (ú20.00 + 1.00 P+P)
                for the kit (ú26.00 + ú1 P+P for a built PCB.

     THIS IS REALLY AN ADVERT - but thoguht you all might like to
know about it...

    Email 101454.3715 @ compuserve.com for more info - ta

--


 ! views expressed do reflect the views of the company
   cos I OWN the company !


From Unknown Sun Dec 17 15:40:37 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!newsfeed.internetmci.com!vixen.cso.uiuc.edu!usenet
From: Carl Gregory <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NMR physicist needs help in HF-circuit design
Date: 15 Dec 1995 21:01:38 GMT
Organization: Univ. of Illinois / Biomedical Magnetic Resonance Lab
Lines: 22
Message-ID: <4asnni$[e-mail]>
References: <4as8n3$[e-mail]>
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X-URL: news:4as8n3$[e-mail]

[e-mail] wrote:
>Finally if you checked out the recent TAMU Newsletter you will find an
>interesting ad. Some Canadian company is selling a hand-held device which will
>suit your need. It combines a synthesized RF source, RF bridge/detector and a
>LCD display (graphic). It is a handy little gadge for NMR work. The only
>drawback is that it is pretty pricy.

Check out the handheld swept reflection bridges from Advanced Electronics Applications
(AEA, Inc, in Washington state, http://www.mvangel.com/aea/) in any recent ham magazine.
These are much less expensive than a commercial swept RF generator, bridge, detector and
scope ($200 ?).  They can also be used right up to most magnets. The drawback is that
they don't cover all the possible frequency ranges NMR folks like to use.

Carl Gregory (K8CG)
Biomedical Magnetic Resonance Laboratory
College of Medicine
University of Illinois
1307 W Park St
Urbana, IL 61801
(217)-244-2350




From Unknown Sun Dec 17 15:40:40 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!uwm.edu!msunews!netnews.upenn.edu!Lehigh.EDU!Lehigh.EDU!not-for-mail
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NMR physicist needs help in HF-circuit design
Date: 15 Dec 1995 11:45:23 -0500
Lines: 62
Message-ID: <4as8n3$[e-mail]>
NNTP-Posting-Host: ns5-1.cc.lehigh.edu

In article <4ak6a7$[e-mail]>, [e-mail]-dortmund.
de () writes:

>The trouble is, that I have no straightforward way to get this
>circuit
>1. on resonance
>2. matched to 50Ohms
>
>
>: >          ||
>: >    >-----||----------
>: >          ||    |     |
>: >       C2       |     |
>: >               ---    O
>: >            C1 ---    O
>: >                |     O coil
>: >                |     O
>: >                |     |
>: >               GND   GND
>:

We have build numerous NMR probes before with the help of a RF sweeper and a
RF bridge w/diode detector. IMO a impedance meter is useless when you start
building the probe from scartch, impedance reading on the meter does not give
you a clue where you are going! With a sweeper, however, you see your resoance
peak and by looking at which way it moves you know where to adjust. The
y axis on the display indicates matching condition (with 50 Ohm match at the
baseline) and the x axis is the frequency. For example, if you resoance is at
the high freq side of your desired freq, you add more capacitance to C1. If
the resonance peak is far above the baseline you increase C2. You are right
abuot that increasing C@ will lower the resonance freq. On a sweeper setup,
you can build a probe in 10 minutes. Go buy/borrow a sweeper and forget about
the impedance meter. The latter is only good when you need to fine-tune the
probe which had been tuned and matched previously (like when you load the
probe with a lossy sample, etc).
In addition, we had replaced the RF bridge with a power combiner/splitter and
works just fine. You simpley feed one of the combine/split input with the
sweeper rf output and connect the sum port of the splitter/combiner to the
probe under tunning. A diode detector is connected to the other combine/split
input. If the load (probe) is tune and matched no voltage (or minimum) will be
detected at the didoe detector output. When your load is mismatched or
off-tuned, you will get a reflective out put at this port. We found this a
cheaper way than buying the RF bridge.
With such a setup, we build up to quadruple tune probe for our experiments.
They are being used by many NMR researchers in the US.
Finally if you checked out the recent TAMU Newsletter you will find an
interesting ad. Some Canadian company is selling a hand-held device which will
suit your need. It combines a synthesized RF source, RF bridge/detector and a
LCD display (graphic). It is a handy little gadge for NMR work. The only
drawback is that it is pretty pricy.

Hope this helps and let me know if you have further questions.


DJ
===============================================================================

D. J. Wang, Ph.D. N2YKP                     Lehigh University
Director of Instrumentation                 Chemistry Department
[e-mail]                             Seeley G. Mudd Bldg.
[phone] (Ph)                          6 E. Packer Ave.
[phone] (Fax)                         Bethlehem, PA 18015


From Unknown Sun Dec 17 15:40:41 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!Germany.EU.net!Dortmund.Germany.EU.net!Uni-Dortmund.DE!thorsten
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NMR physicist needs help in HF-circuit design
Date: 17 Dec 1995 09:31:54 GMT
Organization: University of Dortmund, Germany
Lines: 23
Message-ID: <4b0o2b$[e-mail]>
References: <4as8n3$[e-mail]> <4asnni$[e-mail]>
NNTP-Posting-Host: ara.physik.uni-dortmund.de
X-Newsreader: TIN [version 1.2 PL2]

Thanks for all your help, meanwhile I managed to build up a parallel
resonator. From some 'old' equipment (RF-sweeper + scope) and
a 'Magic-T' I built up some kind of device you suggested. Seems to
work fine.
One last (?) question:
the whole trouble started when I tried to change from series resonators
to parallel resonators in order to be able to tune externally and to
hold losses along the line low. Using just a coil and after n*lambda/2
a series C + paralle C would mean high VSWR and so high losses. Now what
if I put the coil and the series C at one end, the matching parallel C
at the other end of the line ? This would be a 'normal' (considering
our probes) series-resonator, so more used to me. But would this
also mean high losses along the line ? I think that the high voltages
at resonance (that are responsible for the great losses, if just the
coil is at one end) only occur between series C and coil, so that they
would NOT be seen on the line in this concept. Am I right with this
idea??

Hoping for your patience is

Thorsten

[e-mail]


From Unknown Sun Dec 17 15:40:42 1995
From: [e-mail] (Doug Reed)
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!rosevax!hamlink!fredmail
Newsgroups: rec.radio.amateur.homebrew
Subject: Optimaltech Ep-2a-28 info
Message-ID: <[e-mail]>
Date: Sat, 16 Dec 1995 09:12:14 -0100
X-FTN-To: All
Lines: 15


I have an old Optimal Technologies EP-2A-28 Eprom programmer.
But I only have one personality module for the TMS 2532 EPROM.
As far as I know the module is nothing more than a 24 pin header with
jumpers to connect various pins of the EPROM to programming signals.
I'd like to hear from anyone with wiring info for the personality
modules before I decide to throw it away or stip it for parts.
Since it is mainly a gang copier/programmer, it isn't what I need but
I hate throwing things away.  Thanks for the help.

Doug Reed, N0NAS        email: [e-mail]

 * SLMR 2.1a * What happened to the Paperless Computerized Revolution?




From Unknown Sun Dec 17 15:40:42 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsat!engineer.mrg.uswest.com!news.uoregon.edu!inquo!test.erinet.com!imci3!imci2!newsfeed.internetmci.com!swrinde!sdd.hp.com!hpscit.sc.hp.com!icon!greg
From: [e-mail] (Greg Dolkas)
Subject: Re: pc board routing program
Sender: [e-mail] (News Administrator)
Message-ID: <[e-mail]>
Date: Thu, 14 Dec 1995 00:09:18 GMT
References: <4a738r$[e-mail]>
Organization: HP - Information Networks Division
X-Newsreader: TIN [version 1.1.8 PL6]
Lines: 11

scottc ([e-mail]) wrote:
: Does anyone know of a good check pcb board routing program?
:
: I downloaded easytrak and autotrak but they seem to be complicated to
: use.
:
I haven't used either of those, but PCTRACE seems easy to use.  1 or 2 layer
boards, autorouter (not real intelligent, but it works).  Works on minimal
DOS system (even on my 100LX palmtop!).

Greg  KO6TH


From Unknown Sun Dec 17 15:40:43 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!nw003.infi.net!imci3!news.internetMCI.com!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netcom.com!mzenier
From: [e-mail] (Mark Zenier)
Subject: Re: PCB Etching
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
References: <4ajcmd$[e-mail]>
Date: Thu, 14 Dec 1995 19:44:26 GMT
Lines: 17
Sender: [e-mail]

in <4ajcmd$[e-mail]>, Barry Lennox wrote:
: Some years ago there was an article in the now-defunct "Ham Radio" on PCB
: etchants. I recall the best solution was Cupric chloride and some other
: additives. The really cute thing was that it was possible to regenerate the
: solution by overnight aeration. (I think that it was possible to end up with
: more etchant than you started with.)

: Anybody have this article ? More importantly, has anybody tried it with
: success?

The book "Electronic Prototype Construction" by Stephen D Kasten has a
good chapter on this.  It's dated 1983 from Howard W. Sams.  (I don't
know what you'd have to do to Prentice Hall Computer Books to get them
to reprint it.)  Be worth a search at a good engineering library.

Mark Zenier  [e-mail]  [e-mail]



From Unknown Sun Dec 17 15:40:44 1995
From: [e-mail] (Doug Reed)
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!rosevax!hamlink!fredmail
Newsgroups: rec.radio.amateur.homebrew
Subject: Pcb Etching question???
Message-ID: <[e-mail]>
Date: Sat, 16 Dec 1995 09:12:13 -0100
X-FTN-To: Chris Findley
Lines: 31

>[e-mail] (Chris Findley) wrote:
> Also, and most important: What can I use to mask
>large areas of the board with??? I am familiar with the photo etch....

I used to use fingernail polish or fingernail hardner.  Just paint it on
and let it dry.  I tried using tape before but I usually had the edges
loosen up, undercuting the edge and any tape joints.  I expect that
something like Testors Enamel model paint would work too.  Or probably
any old house paint or maybe even spray paint.  The hardest part is
getting some of these materials off the board when done!  Use a solvent
to loosen it up.  I used to put the fingernail polish on thick and run a
razor blade under it for removal.  Always finished up with a light
sanding anyway.

I'll also agree that getting the spray resists to work was very hit and
miss, mostly miss.  If you want to spend some time with graphic arts,
the old silk screen techniques are still the best for large quantities
of boards at home.  Some of the graphics arts films for silk screening
might also work as a direct application photo resist for the board. What
looks like the most promising technique for one or two boards at a time
is the laser print plastic films.  That assumes of course your printer
can do the graphics or the local copier can make a real 1:1 print.
I bought some of the film a few years ago but haven't used it yet so I'd
be interested in hearing other peoples experiances.
Merry Christmas!

Doug Reed, N0NAS       email: [e-mail]

 * SLMR 2.1a * Doug Reed, N0NAS    email: [e-mail]




From Unknown Sun Dec 17 15:40:45 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!chi-news.cic.net!nntp.coast.net!zombie.ncsc.mil!cs.umd.edu!newsfeed.gsfc.nasa.gov!usenet
From: "Steven A. Bailey" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: PCB formats?
Date: 14 Dec 1995 15:01:04 GMT
Organization: NASA Goddard Space Flight Center -- Greenbelt, Maryland USA
Lines: 9
Message-ID: <4ape7g$[e-mail]>
NNTP-Posting-Host: bailey.wff.nasa.gov
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 32bit)

I am interested in sending a PCB design to a PCB manufacturing
house.  Unfortunately, my Windows based PCB program (PIA-PCB) does
not support Gerber files.  However, I can write to Postscript, HPGL,
or any format supported as a Windows printer.  Do PCB houses support
either of these file formats or will they take a negative produced
on a transparency?  Any advice is welcome!!

Thanks, Steve



From Unknown Sun Dec 17 15:40:46 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news1!ts02-ind-28
From: [e-mail] (Mike Cline)
Subject: Re: PCB formats?
X-Nntp-Posting-Host: ts02-ind-28.iquest.net
Message-ID: <[e-mail]>
Sender: [e-mail] (News Admin)
Organization: IQuest Internet, Inc.
X-Newsreader: News Xpress Version 1.0 Beta #2.1
References: <4ape7g$[e-mail]>
Date: Sat, 16 Dec 1995 12:33:17 GMT
Lines: 19

"Steven A. Bailey" <[e-mail]> wrote:
>I am interested in sending a PCB design to a PCB manufacturing
>house.  Unfortunately, my Windows based PCB program (PIA-PCB) does
>not support Gerber files.  However, I can write to Postscript, HPGL,
>or any format supported as a Windows printer.  Do PCB houses support
>either of these file formats or will they take a negative produced
>on a transparency?  Any advice is welcome!!
>
>Thanks, Steve
>

We had a place make a few boards several of years ago and I sent
them a photo negative made at a school photograohic lab from a
printout made on an old dot matrix printer. I suspect it cost us
extra, but they were able to touchup the negative and produced
excelent boards.

Mike
N9RJW


From Unknown Sun Dec 17 15:40:47 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (RRRath)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Phasenoise-CHEAP-FFT-online
Date: 17 Dec 1995 08:33:23 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 47
Sender: [e-mail]
Message-ID: <4b1673$[e-mail]>
References: <4b100h$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

Hi,
Conventional analysers and panadapters are very slow if used for narrow
spans.

I have been experimenting with some pgms for FFT with soundcards
(e.g. from Simtel , Cica site), but IMHO the following pgms (FREE!!)
are the best:

a) freq4.zip (134KB) DOS from Phil VanBaren
   on many sites, or simtel/sound
  supports 16bit mode of Pro Audio Spectrum 16 and PA Studio 16,
 other soundcards only in SB 8bit mode.
 With PAS 16 about 75db dynamic, very useful online change of parameters
 very fast, also freeze, screenshot possible.

aa) the new freq51a.zip( 515K) is more or less the same, somewhat less
stable?
   but includes version for LINUX and supports Logitech Soundman as well
as
   cards with VESA AI BIOS.
   http://schaeffer.eecs.umich.edu/~phillipv/signal ..also screenshots
   as well as sonogram.

b) digitize from Matt Park--WINDOWS
   dig12b1.exe  ftp.transend.com/pub/users/mattpark
   less dynamic ..60db, but useable with all soundcards
   Author has written it for a friend --panadapter and described in:
   Aug.1995 Circuit Cellar Ink, The Computer Applcation Journal

c) A fellow ham and spectrumanlyserdev. was quite impressed by a
simple FFT solution at a RFexpo  about 1 1/2 years ago,
very small company, owner from India,
offered DEMO disk and brochure as well as soundcard with add. screening.

Unfortunately said Om has lost disk and address
Anybody know??

Any other good and cheap pgsm known??

-see my further info about offline pgms

73 and Merry Xmas from Munich

Robert
DJ0RA, OE5RRL

PS: use after dec.30th my CIS ID: 100626,[e-mail]


From Unknown Sun Dec 17 15:40:49 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (RRRath)
Newsgroups: rec.radio.amateur.homebrew
Subject: Phasenoise-CHEAP-homebrew
Date: 17 Dec 1995 06:47:29 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 41
Sender: [e-mail]
Message-ID: <4b100h$[e-mail]>
Reply-To: [e-mail] (RRRath)
NNTP-Posting-Host: newsbf02.mail.aol.com

Hi,
in the previous discussion regarding the HP8640B was mentioned.
Also the 3585 is still quite expensive.
Personally i┤m using a Marconi TF2370-2373 or self built 10,7MHz unit:

mixer, filter, TBA120, diff amp driving Xtal discriminator at 10,7 MHz,
followed by lownoise Opamp.

Marconi has published a similar approach about 10??years ago, used
for their own test of synthesizers etc.
mixer, lowpass, lownoise 1,5MHz IF amp with discriminator, then TF2330
waveanalyser.
Indicated measurement limit:
 100Hz offset  115db
   1 KHz         140db
  10KHz         153db
Advantage: no phase lock required, thus alos for free running osc., as not
so sensitive at low offsets thus for old valve osc. with 60Hz sidebands.
Disadvantage: insensitive very close to carrier.

"Marconi Instrumentation Vol 115, no.6,
"Measurement of phase noise in signal generators", D.P.Owen, pp.117-122.

PA0JZ has described in the Dutch Ham magazine VERON may-july92
a cheap doit yourself unit:
mixer (MD108), lownoise preamp with BC149C, amp NE5534, then
2 spot filters at 1 and 10 KHz with 4 opamaps aech and
1 100KHz LC-filter.
2 opamps for phaselockcircuitry.
Measurement limits wtih Xtal osc:
1 KHz offset   140db/Hz
10KHz           165
100KHz         170db.

Idea: why not use FFT with a soundcard at output
-see seperate message.

73s and Merry Xmas
Robert DJ0RA, OE5RRL

ps: use after dec.29th my CIS ID: 100626,[e-mail]


From Unknown Sun Dec 17 15:40:50 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!agate!news.mindlink.net!van-bc!news.rmii.com!slip876.rmii.com!jay
From: [e-mail] (Jay de Halas)
Newsgroups: rec.radio.amateur.homebrew,sci.electronics.cad,sci.electronics
Subject: Printing directly to PCB with an ink jet printer ?
Date: Tue, 12 Dec 1995 22:25:26 LOCAL
Organization: Rocky Mountain Internet Inc.
Lines: 19
Message-ID: <[e-mail]>
NNTP-Posting-Host: slip876.rmii.com
Keywords: Printed circuits, PCB
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4]
Xref: news.epix.net rec.radio.amateur.homebrew:12141 sci.electronics.cad:5147 sci.electronics:162443

Hi;
I recall seeing bits and pieces of a thread about doing PCB's with an ink jet
printer. I have been doing artwork with a number of laser printers, and
have yet to find one with decent registration. Registration is crictical
to me as I am trying to drill out the holes with a NC drilling machine. Plan B
use an ink jet printer instead.  Also I intend to print directly to the
PCB and skip a bunch of steps. So what I would like to know is the following.

1. Has anyone done this ?
2. If so, what printer did thay use ?
3. What ink jet printers have a flat paper path ?  Color would appease my wife
    and kid.
4. Is registration any better than what you would get with a laser printer ?
5. Any other ideas ?


Thanks !!!

Jay L. de Halas


From Unknown Sun Dec 17 15:40:51 1995
Path: news.epix.net!usenet
From: Garry Foster <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,sci.electronics.cad,sci.electronics
Subject: Re: Printing directly to PCB with an ink jet printer ?
Date: 16 Dec 1995 18:55:51 GMT
Organization: epix.net
Lines: 35
Message-ID: <4av4nn$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: peach.epix.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)
Xref: news.epix.net rec.radio.amateur.homebrew:12186 sci.electronics.cad:5170 sci.electronics:162607

[e-mail] (Jay de Halas) wrote:
>Hi;
>
>3. What ink jet printers have a flat paper path ?  Color would appease

I don't know of any that would feed PC material.


>4. Is registration any better than what you would get with a laser printer ?

I can't see how they could be as good. In the Horz a laser should be near
perfect. In the vertical both have similar paper movement. Having used
both I find the laser usually seems more accurate.



>5. Any other ideas ?
The only direct print to PC board I have heard of is with a flat bed
plotter. Some have reported drawing directly on the material with
ploters. However my ploter moves the paper in one direction and the pen
in the other. It would seem that you should be able to put a pen in your
cnc drilling machine and draw using it with proper software. Is it a home
brew CNC drill or what. The basics of a plotter and a cnc machine are all
the same.
                                             Garry WB0NNO



>
>
>Thanks !!!
>
>Jay L. de Halas




From Unknown Sun Dec 17 15:40:52 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!plug.news.pipex.net!pipex!tube.news.pipex.net!pipex!dish.news.pipex.net!pipex!lade.news.pipex.net!pipex!pipex-sa.net!usenet
From: [e-mail] (Tim Jackson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Printing to PCB material from a laser printer
Date: Sun, 17 Dec 1995 14:37:15 GMT
Organization: pipex-sa.net
Lines: 20
Message-ID: <[e-mail]>
NNTP-Posting-Host: pop57.dial.pipex.co.za
X-Newsreader: Forte Agent .99c/16.141

Does anyone know of a simple way of getting PC board artwork from a
laser printout to the PCB material for etching?

If it were possible to feed the PCB material directly through the
printer that would be perfect but it isn't. Not on my Laserjet 4L at any
rate, as far as I know.

I've tried printing to glossy paper and then ironing the image onto the
PCB but without much luck. Maybe I'm using the wrong paper.

ANY hints, tips or ideas would be most welcome.

Thanks.


--
  ____  ____  __  __
 (_  _)(_  _)(  \/  )    -= From Sunny South Africa =-
   )(   _)(_  )    (     Biking weather all year round
  (__) (____)(_/\/\_)              '82 CBX


From Unknown Sun Dec 17 15:40:53 1995
Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!news.u.washington.edu!news.alt.net!news1.alt.net!news.aros.net!usenet
From: [e-mail] (Douglas L. Datwyler)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Quick and dirty demostration of AM
Date: 16 Dec 1995 03:25:26 GMT
Organization: ArosNet Inc.
Lines: 15
Message-ID: <4ate76$[e-mail]>
References: <4a9g80$[e-mail]>
NNTP-Posting-Host: anp17.aros.net
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.5

In article <4a9g80$[e-mail]>, [e-mail] says...
>
>I need to know of a quick and dirty (EASY) demostration of AM modulation for
>an upcoming Boy Scout round table. HINTS, or outright answers are welcome.
>
>
>Douglas L. Datwyler  WR7O
>[e-mail]
>
I would like to thank all who replied to my message. They were all great
suggestions. I will be using parts of them upcoming shortly.

Douglas L. Datwyler  WR7O
[e-mail]



From Unknown Sun Dec 17 15:40:54 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!psinntp!psinntp!psinntp!psinntp!main03!landisj
From: [e-mail] (Joe Landis - Systems & Network Mgr)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RADAR DETECTOR DETECT
Message-ID: <[e-mail]>
Date: 13 Dec 95 14:03:55 EST
References: <[e-mail]> <[e-mail]>
Distribution: world
Organization: North American Drager - Telford, PA
Lines: 48

In article <[e-mail]>, Bob Archer <[e-mail]> writes:
> It's my understanding that the "ghost technology" is nothing more than
> detection by your Radar Detector of the Police detectors local oscillator that
> powers down your Radar Detector.
[snip]

I think you're right. Seems like the only solution that make economic sense.
Putting up anything other than a bare mixer for a reciever on 10.5 and 24Ghz is
going to cost a lot more than most customers would be willing to pay.
Well I guess a decent waveguide isolator would do it, but even the cost of
that would be prohibitive in the mass market.

Joe - AA3GN

>>==========[e-mail], 12/8/95==========
>>
>>Hi!
>>
>> > I saw a Radio Shack ad for a speed radar dectector with
>>"ghost"
>> > technology. This "ghost technology" will defeat radar dectector
>> > dectectors. I know you can locate a receiver by its local
>> > oscillator, but do the police use something like this? What is
>> > the range of these radar detector detectors? Is it so short
>>ranged
>> > that the police carry them up to the suspect vehicle/
>> >
>> > Thanks for your input.
>> > Harry in TX KA5IMO
>>
>>I can't really help but I also heard that there is laser gun now...
>>
>>Does anyone know if they can be detected?
>>
>>Well, it's only for personnal information since I live in Canada and
>>these are prohibited here.  :(
>>
>>
>>73's de   |    Fido: 1:240/118    |  Internet:
>>[e-mail]
>>I)aniel   |  Franco: 101:155/118  |    Packet:
>>VE2DLX@VE2SJC.#QBC.PQ.CAN.NA
>>
>>
> Bob Archer N4ECO
--
Joe Landis - Systems and Network Manager - North American Drager - Telford, PA
[e-mail]                        ..speaking only for myself, of course..


From Unknown Sun Dec 17 15:40:55 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!usc!newshub.csu.net!cello.gina.calstate.edu!cello.gina.calstate.edu!not-for-mail
From: [e-mail] (William A Moyes)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RADAR DETECTOR DETECT
Date: 13 Dec 1995 22:59:44 -0800
Organization: GINA and CORE+ Services of The California State University
Lines: 12
Message-ID: <4aoi10$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: cello.gina.calstate.edu

Bob Archer ([e-mail]) wrote:
: It's my understanding that the "ghost technology" is nothing more than
: detection by your Radar Detector of the Police detectors local oscillator that
: powers down your Radar Detector.

        So whats the next step, the police detectors will power down
their local oscillators before you have a chance to power down your local
oscillator to avoid detection ;^).

                        -William Moyes
                        [e-mail]



From Unknown Sun Dec 17 15:40:57 1995
Date: 11 Dec 1995 20:02:18 EDT
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!io.org!torfree!feline!humnet.humberc.on.ca!hduff
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Hugh Duff)
Message-ID: <[e-mail]>
Organization: HumberNet LSS, Humber College, Canada
References: <[e-mail]>
Subject: Re: RADAR DETECTOR DETECT
Lines: 30


> Hi!
>
>  > I saw a Radio Shack ad for a speed radar dectector with "ghost"
>  > technology. This "ghost technology" will defeat radar dectector
>  > dectectors. I know you can locate a receiver by its local
>  > oscillator, but do the police use something like this? What is
>  > the range of these radar detector detectors? Is it so short ranged
>  > that the police carry them up to the suspect vehicle/
>  >
>  > Thanks for your input.
>  > Harry in TX KA5IMO

Interesting !
My buddy is a designer at the firm that designes and manufactures the
Radar-detector-detector.  They are simply very sensistive receivers
tuned to the IF of a radar detector.  A lot of stray energy gets emitted
from the small receiver feedhorn built in to most radar detectors.
It would be pretty difficult to shield the L.O. enough so that stray RF
does not escape.  I'd be interested in hearing how this "ghost
technology" works unless of course they are referring to the laser
units.

Regards !
Hugh Duff  VA3TO  Toronto



---
 ■ NFX v1.3 [000]


From Unknown Sun Dec 17 15:40:57 1995
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!news.kreonet.re.kr!usenet.seri.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!info.ucla.edu!galaxy.ucr.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Komljanec, Tony)
Newsgroups: rec.radio.amateur.homebrew
Subject: Radar Detector Detector
Date: 15 Dec 95 23:23:00 GMT
Organization: ucsd usenet gateway
Lines: 8
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]


The Radar detector LO receiver is called the VG-2 and is made in
Mississauga, Ontario.  Stealth radar detectors simply use a redesign
receiver/horn with an LO on another frequency that the VG-2 isn't looking
for.  They still leak like crazy, just not at 11 GHz!

Tony K
VA3TK


From Unknown Sun Dec 17 15:40:58 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (PDRUNEN)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RADAR DETECTOR DETECTOR??
Date: 16 Dec 1995 20:57:16 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 6
Sender: [e-mail]
Message-ID: <4avtds$[e-mail]>
References: <4akj4j$[e-mail]>
Reply-To: [e-mail] (PDRUNEN)
NNTP-Posting-Host: newsbf02.mail.aol.com

I always seem to get a false detection when someone near me is using
another detector.  I also seem to get interference from the CellPhones.

Would be interested to know what frequency the IF of the radar gun is!

Thanks


From Unknown Sun Dec 17 15:40:59 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!newsfeed.internetmci.com!swrinde!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb
From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Resistor for RF power attenuator help needed
Date: 14 Dec 1995 19:28:40 GMT
Organization: Hewlett Packard Corvallis Site
Lines: 19
Message-ID: <4aptt8$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: hplsnb.lsid.hp.com
X-Newsreader: TIN [version 1.1 PL9.4]

In the ten or so responses I've seen here, I've seen folk mention that
carbon composition resistors are getting hard to find, but nobody
has mentioned metal oxide resistors.  Commonly available in 1 and 2 watt
sizes and perhaps larger, the ones I've checked in the 25 to 100 ohm range
have very low parasitics.  I use a pair of 100 ohm, 2 watt, units in
parallel as a load for testing my handheld, and have measured SWR around
1.3:1 at 450MHz and for practical dummy load purposes, 1:1 at 2 meters.

Another very low parasitic power resistor is one made by Caddock:  it's
in a TO-220 style case.  The biggest problem is the 4 or 5 pF from element
to metal tab, used for heat transfer.  You can dissipate 50 watts in one
of these guys if you can heat sink it well enough.  I think one of the
other companies (Vishay?) has recently started advertising a medium-power
resistor with low parasitics, too.

--
Cheers,
Tom
[e-mail]


From Unknown Sun Dec 17 15:41:00 1995
Path: news.epix.net!uunet!in1.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Resistor for RF power attenuator help needed
Date: 15 Dec 1995 10:50:11 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 34
Sender: [e-mail]
Message-ID: <4as5fj$[e-mail]>
References: <4aptt8$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

Hi Tom,

In article <4aptt8$[e-mail]>, [e-mail] (Tom Bruhns)
writes:

>In the ten or so responses I've seen here, I've seen folk mention that
>carbon composition resistors are getting hard to find, but nobody
>has mentioned metal oxide resistors.  Commonly available in 1 and 2 watt
>sizes and perhaps larger, the ones I've checked in the 25 to 100 ohm
range
>have very low parasitics.  I use a pair of 100 ohm, 2 watt, units in
>parallel as a load for testing my handheld, and have measured SWR around
>1.3:1 at 450MHz and for practical dummy load purposes, 1:1 at 2 meters.

Sometimes that is true, sometimes it isn't. I just checked some 2 watt MF
here that have 100 nanohys ind at a test frequency of 60 MHz. This
resistor would be worthless in most parasitic supressor systems.

This varies from manufacturer to manufacturer, my rule is to always check
'em and not assume they are non-inductive. .
>
>Another very low parasitic power resistor is one made by Caddock:  it's
>in a TO-220 style case.  The biggest problem is the 4 or 5 pF from
element
>to metal tab, used for heat transfer.  You can dissipate 50 watts in one
>of these guys if you can heat sink it well enough.  I think one of the
>other companies (Vishay?) has recently started advertising a medium-power
>resistor with low parasitics, too.
>
Yes, someone mentioned them. I have some here, they work well. They are
kind of pricey for a tightwad like me. In thousands Allen Bradly *real*
carbon comps are 20 or 30 cents each.

73 Tom


From Unknown Sun Dec 17 15:41:02 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!newsrelay.iastate.edu!news.iastate.edu!soclab.soc.iastate.edu!flipk
From: [e-mail] (Phil Knaack)
Newsgroups: sci.electronics,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc,de.comm.ham
Subject: Re: Serial-to-Parallel Converter
Date: 13 Dec 95 18:42:53 GMT
Organization: Iowa State University, Ames, Iowa
Lines: 21
Message-ID: <[e-mail]>
References: <4a383p$a74$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <4am7op$[e-mail]>
NNTP-Posting-Host: soclab.soc.iastate.edu
Xref: news.epix.net sci.electronics:162256 rec.radio.amateur.misc:95523 rec.radio.amateur.homebrew:12109 rec.radio.amateur.digital.misc:13089 de.comm.ham:2536

In <4am7op$[e-mail]>
        [e-mail] (Henrik Johnsson) writes:

>It would most definitely not do the trick, at least not without large
>amounts of support logic. The original post was about asynchronous
>serial transfer. It can be done with the HD6402 as mentioned, but it
>will take a few extra chips to go along. A microcontroller with onboard
>PROM would probably give the lowest chip count, but you need some tools
>that not everyone has available (compiler/assembler, device programmer).

        This sounds like a great deal of overkill to me.

        serial-to-parallel: isn't a UART what is desired? Maybe a couple
more chips to generate strobe pulses, and a crystal; but that should be about
it.

Cheers,
Phil
--
Phillip F Knaack
Tech Junkie / Junk Techie


From Unknown Sun Dec 17 15:41:03 1995
Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!newsrelay.iastate.edu!news.iastate.edu!soclab.soc.iastate.edu!flipk
From: [e-mail] (Phil Knaack)
Newsgroups: de.comm.ham,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew,rec.radio.amateur.misc,sci.electronics
Subject: Re: Serial-to-Parallel Converter
Date: 13 Dec 95 18:47:27 GMT
Organization: Iowa State University, Ames, Iowa
Lines: 24
Message-ID: <[e-mail]>
References: <4a383p$a74$[e-mail]> <[e-mail]>
NNTP-Posting-Host: soclab.soc.iastate.edu
Xref: news.epix.net de.comm.ham:2537 rec.radio.amateur.digital.misc:13091 rec.radio.amateur.homebrew:12111 rec.radio.amateur.misc:95530 sci.electronics:162267

In <[e-mail]>
        [e-mail] (Larry DeSoto) writes:

>In article <4a383p$a74$[e-mail]>,
>       Brian Webb <[e-mail]> writes:

>> I'm trying to find either an IC or a schematic for converting
>> serial-parallel.

>You need a Universal Asynchronous Receiver Transmitter (UART).  One
>entirely satisfactory device I've used is a Giant AY-1013.  This is
>an old device and I don't know if they are still being manufactured.
>If you can get one, it is easy to use in that it requires minimal
>support (a clock and maybe a level converter for the serial line).

Just two years ago I replaced the 1013 in my Radio Shack TRS-80 Model III.

They are still rather easy to obtain.

Cheers,
Phil
--
Phillip F Knaack
Tech Junkie / Junk Techie


From Unknown Sun Dec 17 15:41:04 1995
Path: news.epix.net!uunet!in2.uu.net!news.mathworks.com!tank.news.pipex.net!pipex!demon!peer-news.britain.eu.net!uknet!ftel.co.uk!bristol.st.com!salsa!richarde
From: [e-mail] (Richard Evans)
Newsgroups: de.comm.ham,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew,rec.radio.amateur.misc,sci.electronics
Subject: Re: Serial-to-Parallel Converter
Date: 13 Dec 1995 17:26:36 GMT
Organization: INMOS Limited, Bristol, UK
Lines: 29
Sender: richarde@salsa (Richard Evans)
Distribution: world
Message-ID: <4an2cc$[e-mail]>
References: <4a383p$a74$[e-mail]> <[e-mail]>
NNTP-Posting-Host: salsa.inmos.co.uk
Xref: news.epix.net de.comm.ham:2538 rec.radio.amateur.digital.misc:13092 rec.radio.amateur.homebrew:12112 rec.radio.amateur.misc:95533 sci.electronics:162273

In article <[e-mail]>, [e-mail] (Larry DeSoto) writes:
|> In article <4a383p$a74$[e-mail]>, Brian Webb <[e-mail]> writes:
|> > I'm trying to find either an IC or a schematic for converting
|> > serial-parallel.
|> >
|> > I own a solid state radioteletype decoder (circa 1980) designed
|> > to work with serial printers. However, my printer, like virtually
|> > all others is parallel.
|>
|> You need a Universal Asynchronous Receiver Transmitter (UART).  One
|> entirely satisfactory device I've used is a Giant AY-1013.  This is
|> an old device and I don't know if they are still being manufactured.
|> If you can get one, it is easy to use in that it requires minimal
|> support (a clock and maybe a level converter for the serial line).

The 6402 is also suitable. This may be pin compatible with the AY-1013,
and is definitely still available. You can choose parity/stop bits etc
by hard wiring various pins high or low, and it will run up to 100Kbps.
This version needs a clock input, but there's also a 6403 which has a
clock generator built-in so you can just add a Xtal.

Rich
--
-----------------------+----------------------+----------------------------
Richard Evans          |                      |SGS-Thomson Microelectronics
                       |Tel: [phone]|1000 Aztec West, Almondsbury
[e-mail]|Fax: [phone]|Bristol, BS12 4SQ, UK




From Unknown Sun Dec 17 15:41:05 1995
Newsgroups: sci.electronics,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc,de.comm.ham
Path: news.epix.net!uunet!in1.uu.net!tank.news.pipex.net!pipex!news.mathworks.com!newsfeed.internetmci.com!swrinde!howland.reston.ans.net!ix.netcom.com!netcom.com!charles1
From: [e-mail] (charles copeland)
Subject: Re: Serial-to-Parallel Converter
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
References: <4a383p$a74$[e-mail]> <[e-mail]> <4am7op$[e-mail]> <[e-mail]>
Date: Wed, 13 Dec 1995 19:42:17 GMT
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Sender: [e-mail]
Xref: news.epix.net sci.electronics:162303 rec.radio.amateur.misc:95542 rec.radio.amateur.homebrew:12117 rec.radio.amateur.digital.misc:13096 de.comm.ham:2540

In article <[e-mail]>,
Phil Knaack <[e-mail]> wrote:
>In <4am7op$[e-mail]>
>       [e-mail] (Henrik Johnsson) writes:
>
>>It would most definitely not do the trick, at least not without large
>>amounts of support logic. The original post was about asynchronous
>>serial transfer. It can be done with the HD6402 as mentioned, but it
>>will take a few extra chips to go along. A microcontroller with onboard
>>PROM would probably give the lowest chip count, but you need some tools
>>that not everyone has available (compiler/assembler, device programmer).
>
>       This sounds like a great deal of overkill to me.
>
>       serial-to-parallel: isn't a UART what is desired? Maybe a couple
>more chips to generate strobe pulses, and a crystal; but that should be about
>it.

68HC11 with embedded Forth. Takes about 10 lines of Forth. Has
serial port. Has parrallel port with centronics printer support logic.
Awesome little chip.




From Unknown Sun Dec 17 15:41:06 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!news.msfc.nasa.gov!bcm.tmc.edu!newshost.convex.com!cnn.exu.ericsson.se!erinews.ericsson.se!portia!emwhkj
From: [e-mail] (Henrik Johnsson)
Newsgroups: sci.electronics,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc,de.comm.ham
Subject: Re: Serial-to-Parallel Converter
Followup-To: sci.electronics,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc,de.comm.ham
Date: 14 Dec 1995 08:21:51 GMT
Organization: Ericsson Microwave Systems AB
Lines: 31
Message-ID: <4aomqv$[e-mail]>
References: <4a383p$a74$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <4am7op$[e-mail]> <[e-mail]>
NNTP-Posting-Host: portia.emw.ericsson.se
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Phil Knaack ([e-mail]) wrote:
> In <4am7op$[e-mail]>
>       [e-mail] (Henrik Johnsson) writes:

> >It would most definitely not do the trick, at least not without large
> >amounts of support logic. The original post was about asynchronous
> >serial transfer. It can be done with the HD6402 as mentioned, but it
> >will take a few extra chips to go along. A microcontroller with onboard
> >PROM would probably give the lowest chip count, but you need some tools
> >that not everyone has available (compiler/assembler, device programmer).

>       This sounds like a great deal of overkill to me.

>       serial-to-parallel: isn't a UART what is desired? Maybe a couple
> more chips to generate strobe pulses, and a crystal; but that should be about
> it.

That's what I said, wasn't it. The 6402 is a UART, I just pointed out
another option that might save a few chips. Please note that most UARTs
would require a processor both for setup and for data transfer. The 6402
and a few others don't, all setups are done by tying pins high or low and
there are separate 8-bit parallel buses for transmit and receive.

/Henrik

--
    _/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
   _/ Ericsson Microwave Systems AB          _/
  _/ Henrik Johnsson [e-mail] _/
 _/ tel [phone], fax [phone]   _/
_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/


From Unknown Sun Dec 17 15:41:08 1995
Newsgroups: de.comm.ham,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew,rec.radio.amateur.misc,sci.electronics
Path: news.epix.net!news.sprintlink.net!chaos.aoc.nrao.edu!newshost.nmt.edu!baervan.nmt.edu!tesuque.cs.sandia.gov!ferrari.mst6.lanl.gov!nntp-server.caltech.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!ix.netcom.com!netcom.com!mzenier
From: [e-mail] (Mark Zenier)
Subject: Re: Serial-to-Parallel Converter
Message-ID: <[e-mail]>
Followup-To: de.comm.ham,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew,rec.radio.amateur.misc,sci.electronics
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
References: <4a383p$a74$[e-mail]> <[e-mail]> <[e-mail]>
Date: Thu, 14 Dec 1995 19:37:35 GMT
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Sender: [e-mail]
Xref: news.epix.net de.comm.ham:2552 rec.radio.amateur.digital.misc:13134 rec.radio.amateur.homebrew:12154 rec.radio.amateur.misc:95614 sci.electronics:162511

in <[e-mail]>, Phil Knaack wrote:
: Just two years ago I replaced the 1013 in my Radio Shack TRS-80 Model III.

The real part numbers are either AY-5-1013, or AY-6-1013 (old PMOS parts
needing a negative supply) or the AY-3-1015 (5 volt NMOS) or a higher
voltage part (CMOS compatible) AY-3-1014 (5 to 14 volt NMOS).

Mark Zenier  [e-mail]  [e-mail]



From Unknown Sun Dec 17 15:41:09 1995
Path: news.epix.net!uunet!in1.uu.net!inews.intel.com!itnews.sc.intel.com!fmsu03.fm.intel.com!mcd1.fm.intel.com!usenet
From: "Ken (KC6TEU)" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: test
Date: 11 Dec 1995 22:18:52 GMT
Organization: Intel Corporation, Folsom CA, USA
Lines: 2
Message-ID: <4aiaoc$[e-mail]>
References: <495ui8$[e-mail]> <49hph7$[e-mail]> <49t4fn$[e-mail]> <4a07jb$[e-mail]> <4a5dke$[e-mail]>
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just testing



From Unknown Sun Dec 17 15:41:10 1995
Path: news.epix.net!news.sprintlink.net!nntp.coast.net!oleane!pressimage!usenet
From: Philippe CUVINOT <[e-mail]>
Newsgroups: soc.culture.venezuela,soc.culture.uruguay,soc.culture.spain,soc.culture.peru,soc.culture.mexican.american,soc.culture.latin-america,soc.culture.ecuador,soc.culture.cuba,soc.culture.colombia,soc.culture.chile,soc.culture.bolivia,soc.culture.argentina,rec.radio.amateur.policy,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.digital.misc,rec.radio.amateur.antenna
Subject: Un francΘs estß buscando contacto
Date: Sat, 16 Dec 1995 01:01:41 -0800
Organization: Pressimage, France
Lines: 7
Message-ID: <[e-mail]>
References: <[e-mail]>
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Xref: news.epix.net soc.culture.venezuela:43371 soc.culture.uruguay:4675 soc.culture.spain:83561 soc.culture.peru:10990 soc.culture.mexican.american:7892 soc.culture.latin-america:39821 soc.culture.ecuador:4261 soc.culture.cuba:31716 soc.culture.colombia:12492 soc.culture.chile:32334 soc.culture.bolivia:10715 soc.culture.argentina:28715 rec.radio.amateur.policy:32204 rec.radio.amateur.misc:95639 rec.radio.amateur.homebrew:12163 rec.radio.amateur.equipment:22612 rec.radio.amateur.digital.misc:13142 rec.radio.amateur.antenna:17729

Hola,

Soy francΘs y estoy buscando a amigos para conversar acerca de temas
latino americanos. Me interesa muchφsimo la cultura precolombina y
estoy realizando una pßgina a prop≤sito de las grandes civilizaciones.
Escribanme para darme ideas interesantes. Gracias.
Hasta pronto, Philippe.


From Unknown Sun Dec 17 15:41:11 1995
Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!newsfeed.internetmci.com!EU.net!peer-news.britain.eu.net!demon!mail2news.demon.co.uk!ifwtech.demon.co.uk
From: Ian G3SEK <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Varicaps for Texscan Analyzer?
Date: Sat, 16 Dec 1995 16:24:49 +0000
Organization: IFWtech
Lines: 15
Message-ID: <[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: ifwtech.demon.co.uk
X-Newsreader: Newswin Alpha 0.9.1
X-SMTP-Posting-Host: ifwtech.demon.co.uk [Sat, 16 Dec 95 16:27:52 GMT]
X-SMTP-Posting-Host: post.demon.co.uk [Sat, 16 Dec 95 16:30:26 GMT]

Help, please, to repair a dead Texscan AL-60B spectrum analyzer.

I'm trying to locate a replacement source (or at least some data or
equivalents) for the VCO varicap diodes, type VAT51E.

It would be worth replacing or rebuilding the whole VCO, just to get the
analyzer going again, so are there any other sources/ideas for a VCO that
covers the whole octave from 1.0GHz to 2.0GHz?


--
73 from Ian G3SEK          Editor, 'The VHF/UHF DX Book'
                          'In Practice' columnist for RadCom (RSGB)



From Unknown Sun Dec 17 15:41:12 1995
Path: news.epix.net!uunet!in1.uu.net!nwnews.wa.com!news.halcyon.com!usenet
From: Jay Wicklund <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Wanted: DTMF Decoder Suppliers
Date: Wed, 13 Dec 95 08:22:23 PDT
Organization: Northwest Nexus Inc.
Lines: 45
Message-ID: <[e-mail]>
References: <4ainil$[e-mail]>
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Hi Peter,

I don't know about the DTMF decoders that you mentioned, but I did
just see a listing for the CD22204E DTMF decoder in the Circuit
Specialists catalog.  Their phone number is:

1-[phone]
or
1-[phone]

The CD22204E was listed for $2.50 in unit quantities.

73 de KI7RH (Jay Wicklund)



In article <4ainil$[e-mail]>, <[e-mail]>
writes:

> I'm looking for suppliers of a DTMF decoder IC. Part numbers
> SSI202P or 75T202 or CD22202E.
>
> JDR Microdevices reportedly carries these, however the phone
> number I have for them rings through to a fax. Does anyone have a
voice
> line to JDR?
>
> I also tried Digikey...Their WWW page reported that they carried
CD22202E,
> however, after talking with them on the phone, they do not carry
them in
> stock.
>
> I'm looking for a small quanity (4-6 parts) to start.
>
> Any help would be appreciated, please post here or email me
direct.
>
> Thanks,
>
> Peter / KD1XZ
>




From Unknown Sun Dec 17 15:41:13 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!usc!sdd.hp.com!hp-pcd!news1.boi.hp.com!news
From: dave eckhardt <[e-mail]>
Subject: Re:Why 1420 MHz?
Sender: [e-mail] (Boise Site News Server)
Message-ID: <[e-mail]>
Date: Fri, 15 Dec 1995 20:38:29 GMT
Content-Transfer-Encoding: 7bit
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References: <[e-mail]>
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Mime-Version: 1.0
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Organization: Hewlett-Packard / Boise, Idaho
Lines: 11

I attended the Central States Convention this summer in CS,Co.  I did
not attend the NF measuring.  However, if the L-Band preamps were aimed
at SETI, the 1420 MHz frequency is the hydrogen maser emmission
frequey.  Both the temperature and radial velocity of a distant
hydrogen cloud can be measured at 1420 MHz by measuring the broadness of
the emmission and the doppler shift from the laboratory reference
frame emmission.  It is felt that since many "intelligent" look-ee-loos
at deep space will be looking at the hydrogen maser emmission.
Therefore, its a good place for amateurs to look for possible radio
emmissions from other "intelligent" aleins (?).



From Unknown Sun Dec 17 15:41:15 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!sparky.wrlc.org!netnews.com!udel!delmarva.com!news.internetMCI.com!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netcom.com!drp
From: [e-mail] (Randy Petersen)
Subject: WT: Info on Kokasi 800/900 mhz radio
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
Distribution: usa
Date: Fri, 15 Dec 1995 17:44:20 GMT
Lines: 29
Sender: [e-mail]

I have a modified Kokasi 800 mhz radio. It has been modified to 900 mhz
for operation in the 902 to 928 mhz HAM band. The problem is that I have
very little information on it. It has been equiped with a Motorola Motrac
control head. It was operational previously. I have tried to power it up
with no success. When I apply power to its main + and - power lines and
the lines at the control head for ignition connection etc, still no luck.
If you might have info on this radio. It is a trunk mount unit, black with
a large heat sink at one end and is very neat and modular inside. Each
major functional module is in it's own seperate enclosed case.

Any help you can give would be very appreciated.

Randy

                    ____________________________________
                   |          Randy Petersen            |
                   |          [e-mail]            |
                   |                                    |
                   |      [phone] Voice Line     |
                 /)|      [phone] FAX   Line     |(\
                / )|    KE6IZZ 147.855 440.100 1285.00  |( \
             __(  (|____________________________________|)  )__
            ((( \  \ )  /_)                      (_\  ( /  / )))
            (\\\ \  \_/  /                        \  \_/  / ///)
             \          /                          \          /
               \      _/                            \_       /
                /    /                                \      \
               /    /                                   \     \



From Unknown Sun Dec 17 15:41:15 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!lynx.unm.edu!bubba.NMSU.Edu!not-for-mail
From: [e-mail] (beard)
Newsgroups: rec.radio.amateur.homebrew
Subject: WTB: 6550/KT88 Tubes
Date: 16 Dec 1995 07:06:48 GMT
Organization: New Mexico State University
Lines: 8
Message-ID: <4atr68$[e-mail]>
NNTP-Posting-Host: acca.nmsu.edu
X-Newsreader: TIN [UNIX 1.3 950621BETA PL0]

I need several 6550's or KT88's.
I want either USA or Russian (Sovtek) brands.
I don't care if they are used as long as they age good.
Please e-mail me with what you want to sell/trade.

WA4QGA
David Beard



From Unknown Sun Dec 17 15:41:17 1995
Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news.sprintlink.net!clue.callamer.com!biggulp.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WTB: Slotted Line
Date: Wed, 13 Dec 1995 16:45:35 -0800
Organization: CallAmerica, San Luis Obispo CA USA
Lines: 34
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: biggulp.callamer.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
NNTP-Posting-User: cbuttsch
In-Reply-To: <[e-mail]>

Now THIS is a worthwhile idea present in a superb fashion!  W6HDO

On Tue, 12 Dec 1995, Jim Potter wrote:

> Steve Schiller wrote:
> > If you want to make a cheap one suitable for UHF frequencies,
> Take a piece of copper, aluminum or brass tubing at least
> one-half wavelength long at your frequency, sized for a slip fit
> over the center conductor of RG8/u type coax.  Drill holes every
> cm or half inch or whatever.  Make a small E-field probe that
> has a stop so it sticks in the same distance every time and
> measure E (V) as a function of position.  The same thing works
> with waveguide.  Just space the holes appropriately so that you
> get 10 or so points per half-wavelength, and away you go.  A
> cheap and easy prbe can be made from a short length of
> semi-rigid line coax, the kind available surplus with SMA
> connectors on the end.  Cut off one connector.  Cut away the
> outer conductor to expose a length of center conductor.  Solder
> a brass washer to the outer conductor about one wall thickness
> (of your perforated line) back from the end.  Drill the holes to
> clear the OD of the probe outer conductor (About 0.094" for the
> stuff I have) and probe away.
>
> Save big bucks.
>
> Jim
>
> --
> James M. Potter, President      E-mail: [e-mail]
> JP Accelerator Works, Inc.      URL: www.jpaw.com/jpaw/
> 2245 47th Street                Voice: 505-662-5804
> Los Alamos, NM 87544-1604       FAX: [phone]
>
>


From Unknown Thu Dec 21 20:32:55 1995
Path: news.epix.net!news.sprintlink.net!HiWAAY.net!acara.snsnet.net!news5.crl.com!nntp.crl.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (ITUTec)
Newsgroups: rec.radio.amateur.homebrew
Subject: $29 PIC Programmer special ends 12/31/95!
Date: 18 Dec 1995 00:18:07 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 50
Sender: [e-mail]
Message-ID: <4b2tif$[e-mail]>
Reply-To: [e-mail] (ITUTec)
NNTP-Posting-Host: newsbf02.mail.aol.com


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* ZIF upgrade for above programmers               $11
* additional PIC16C84-04/P with purchase of
    PIC-n-GO Package                              $7

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(includes ZIF Socket for programming 40 and 28 PIN PICs)

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--------------------------------------------------------------------------
---
ITU Technologies         [phone]        MasterCard/Visa Accepted
E-Mail: [e-mail] OR [e-mail]
FTP: ftp:\\itutech.com                         WEB: http:\\www.itutech.com
*** See our Web page for more exciting kits and electronic products! ***


From Unknown Thu Dec 21 20:32:57 1995
Date: 20 Dec 1995 18:14:06 EDT
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!hookup!noc.tor.hookup.net!ve3ied!gts!feline!humnet.humberc.on.ca!hduff
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Hugh Duff)
Message-ID: <[e-mail]>
Organization: HumberNet LSS, Humber College, Canada
Subject: 222 MHz Tx designs ??
Lines: 20



I'm thinking of building a transmitter for the FM portion of the
220 MHz band and using my scanner as a reciever just to try out
the local repeater activity.  Wondering if anyone has any neat
designs ?
My initial approach is to borrow the 220 MHz RF strip from
"The Elevator" 222 MHz trasnverter article (Jan.90 QST) and running
a PLL/VCO synth into it.  This design uses 2 MMICs, a 2N5179 and an
MRF227 for about 1 or 2 watts of 222 MHz RF.

Any comments/suggestions welcomed.

Thanks...

Hugh Duff  VA3TO  Toronto


---
 ■ NFX v1.3 [000]


From Unknown Thu Dec 21 20:32:58 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!EU.net!peer-news.britain.eu.net!bcc.ac.uk!news
From: [e-mail] (Dave Kirkby)
Subject: 3 phase mains supply
Sender: [e-mail] (Usenet News System)
Message-ID: <[e-mail]>
Date: Thu, 21 Dec 1995 11:06:22 GMT
Reply-To: [e-mail]
Organization: UCL Dept of Medical Physics
Lines: 27

This is not really connected with ham radio, but perhaps someone here will
know the answer.

Are the electric companies compelled to provide a 3ph mains supply to a
domestic installation if someone wants it? I have all 3 phases at home,
which I assume was fitted since the house uses electric heating and so
has a fairly large load. A colleague want to run a small lathe which
has a 3ph supply. Although I've thought of ways at proving 3 phases from
1, by far the simplist solution is to have the electic company provide him
with all three phases.

Has anyone requested 3 phases in a house? I guess power supply ripple
would be less of a problem and so smooting caps could be smaller, so
it could be useful for ham applications.


---
Dave Kirkby G8WRB
Dept of Medical Physics,
University College London,
11-20 Capper St,
London WC1E 6JA
Tel: [phone]
Fax: [phone]





From Unknown Thu Dec 21 20:32:59 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!galaxy.ucr.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Koellner, Guenter)
Newsgroups: rec.radio.amateur.homebrew
Subject: ? Do you know W1OX or N7ART
Date: 20 Dec 95 20:55:00 GMT
Organization: ucsd usenet gateway
Lines: 19
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]


Hello,

First: Does anyone of you know Edward L. Meade, W1OX or Russ Miller, N7ART.
Do they have an email adress?

I am looking for their (our your?) help: They designed high-power-amps for
2m and 70cm. I got some russian tubes (GS35B and GIxxx) and want to know if
these are working in 3CX1500 or similar designes.

Second: Is there anyone who can give me a copy if W6PO's articles on 220MHz
144MHz amps published in Radio Handbook, 23rd ed. (Indianapolis: Howard W.
Sams and Co., 1987), pp. 18-2 through 18-7  and  pp. 18-11 through 18-15?

Thanks a lot!

vy 73, Guenter, DL4MEA@DB0KCP.#BAY.DEU.EU   (AX.25)
                [e-mail]            (Internet)
                HTTP://WWW.SCN.DE/~KOELLNER (WWW)


From Unknown Thu Dec 21 20:33:00 1995
Path: news.epix.net!news.sprintlink.net!news.heurikon.com!uwvax!uchinews!vixen.cso.uiuc.edu!uwm.edu!lll-winken.llnl.gov!venus.sun.com!male.EBay.Sun.COM!jethro.Corp.Sun.COM!mandalay!aga
From: [e-mail] (Tony Angerame - Sun SE)
Newsgroups: rec.radio.amateur.homebrew
Subject: ALC ??
Date: 21 Dec 1995 00:25:40 GMT
Organization: Sun Microsystems Inc.
Lines: 14
Distribution: world
Message-ID: <4ba9i4$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: mandalay.corp.sun.com


I have a commercial amplifier using an Eimac 8877. This amp has a tank only ca
pable
of 14 mhz operation (Converted sputtering generator). I'd like to add an ALC c
ircuit
to permit reliable SSB operation and was considering the Capacitive voltage di
vider
circuit of the 3-500z amp in a previous handbook. Is this a good idea? Anyone
have
a better suggestion? Simple is better to me. I am going to control the IF stag
e in
an FT-101ZD. TIA


                                                    Tony


                                                    WA6LZH



From Unknown Thu Dec 21 20:33:01 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!EU.net!peer-news.britain.eu.net!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Audio Filters & AGC
Date: Tue, 19 Dec 95 23:17:52 GMT
Lines: 23
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NNTP-Posting-Host: pinetree.microserve.com
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The HF transceiver I'm using employs audio-derived AGC and has an
internal audio notch filter.  I also use an external audio filter.
The problem is that that both filters are in the signal path after
the AGC detector.  They do nothing to prevent a strong interfering
station from activating the AGC and burying a weaker desired signal.

I'm thinking about modifying the circuit to place the detector after
the internal filter, and to also allow injecting audio from my
external filter at a point ahead of the AGC detector.

Assuming the external filter is unity gain, does anyone know a
technical reason not to do this?  Does anyone know if any commercial
units are configured like this (Ten Tec maybe)?  Alternately, I might
simply add an outboard switch to turn off receive AGC altogether, but
I don't think this would be entirely satisfactory.  The desired signal
isn't always weak, and AGC action is often needed even though the
filters are in use.

Any suggestions or ideas on this problem will be appreciated.

73,
Jack  WB3U


From Unknown Thu Dec 21 20:33:04 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!world!mv!usenet
From: [e-mail] (Andy Borsa)
Subject: Re: Audio Filters & AGC
Message-ID: <[e-mail]>
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
Organization: RF/Wireless Design Consultant
Date: Thu, 21 Dec 1995 05:49:08 GMT
References: <[e-mail]>
X-Newsreader: WinVN 0.99.6
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Lines: 24

In article <[e-mail]>,
[e-mail]┌ says...
>
>The HF transceiver I'm using employs audio-derived AGC and has an
>internal audio notch filter.  I also use an external audio filter.
>The problem is that that both filters are in the signal path after
>the AGC detector.  They do nothing to prevent a strong interfering
>station from activating the AGC and burying a weaker desired signal.
>
>I'm thinking about modifying the circuit to place the detector after
>the internal filter, and to also allow injecting audio from my
>external filter at a point ahead of the AGC detector.

Besides the front-end overload problem, placing notch filters and such in the
agc feedback path could cause horrible transient response, ringing, etc.
Could possibly make it unstable.  It could also slow down the agc response,
which is always a problem with audio agc anyway.  An el cheapo way to design
comm receivers, in my opinion.

Course, if you like to experiment...

--
    Andy Borsa -- !!!The Universe is discretely analog!!!



From Unknown Thu Dec 21 20:33:05 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netcom.com!slay
From: [e-mail] (Sandy Lynch)
Subject: Cmos Super Keyer & TS-820
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
X-Newsreader: TIN [version 1.2 PL2]
Date: Mon, 18 Dec 1995 18:42:12 GMT
Lines: 7
Sender: [e-mail]

A chum of mine recently built the CMOS Super Keyer III and now finds that
he can't use it to drive his old Kenwood TS-820.  Anybody care to point us
in a direction where a suitable interface circuit may be found?

Thanks & 73
Sandy



From Unknown Thu Dec 21 20:33:06 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!sgigate.sgi.com!bridge2!3mail.3com.com
From: [e-mail] (Rex Allers)
Newsgroups: rec.radio.amateur.homebrew
Subject: Cupric Cloride PCB Etching
Message-ID: <[e-mail]>
Date: 21 Dec 95 02:36:58 GMT
Sender: [e-mail]
Organization: 3Com
Lines: 32
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Content-Type: Text/Plain; charset=ISO-8859-1

Last week, someone asked about using Cupric Cloride solution to etch PC Boards
.
They mentioned an old article in Ham Radio.  I lost the original message so I
can't reply in that thread, but here's some info on a different description of

the process...

 I don't recall seeing the Ham Radio article, but I have a book that has
a chapter on the subject.  The book is "Electronic Prototype
Construction" by Stephen Kasten, copyright 1983.  The CuCl2 method sounds
good, but I have never got around to trying it.
  His formula is: solid CuCl2  200 g,  Conc. HCl  100 g,   Water to make
1000 ml.   Etching reduces Cupric Cloride to Cuprous Cloride.  By
bubbling Oxygen (air) through the solution in the presence of HCl the
Cuprous Cloride is turned back into Cupric Cloride for more etching.
The solution starts as bright emerald green.  As etching converts it to
Cuprous Cloride, the color goes to murky olive-brown.
  The author used a bubble etcher made from a cooler (plastic kind used
for drinks and food).  The solution was heated to make etching go
faster.  The bubbles agitate the solution during etching, then are kept
going after etching until the color of solution is restored.  The
solution grows as time passes (kind of like sourdough) but must be kept
up by adding water and HCl.
  The book has several paragraphs on how to maintain the solution, but
basically it comes down to specific gravity to determine how much water
to add and titration of a sample with NaOH to determine hydrocloric acid
level.
  It all sounds very good, but like I said, I haven't tried it myself.
The book was good on this subject, but I assume it is out of print
now.  Some of the rest of the book is a bit dated, but not a bad
reference overall.





From Unknown Thu Dec 21 20:33:07 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!wave.news.pipex.net!pipex!dish.news.pipex.net!pipex!plug.news.pipex.net!pipex!oleane!jussieu.fr!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!uwm.edu!msunews!netnews.upenn.edu!netaxs.com!usenet
From: Rocci <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DC Rcvr w/DSP backend
Date: Sun, 17 Dec 1995 21:00:15 -0800
Organization: Net Access - Philadelphia's Internet Connection
Lines: 19
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
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X-Mailer: Mozilla 2.0b2a (Windows; I; 16bit)

David Feldman wrote:
>
> Well, not quite that sophisticated, but I've been trying an old Ten-Tec
> PM3A transceiver (DC, 20 & 40M) feeding a Radio Shack DSP40 for audio
> amplification and selectivity. The combo works reasonably well, but the
> lack of AGC action in the Ten-Tec makes it awfully hard to hit the
> preferred input level "window" of the DSP40. I suspect you'd want to
> work out these AGC issues before getting too committed to this scheme.
>
I'm not sure what a DSP40 is, but I assume that it's some sort of audio
filter. Of course, the problem with audio filtering in a DC receiver is that
it does nothing to reject the image frequencies. A dual DSP at the
quadrature outputs of two mixers would, theoretically, perform near perfect
unwanted sideband cancellation. In addition, the DSP program could perform a
compound AGC action by performing limited AGC action in software, and also
drive a hardware gain reduction circuit at the RF input for increased
dynamic range.

Joe


From Unknown Thu Dec 21 20:33:08 1995
Path: news.epix.net!news.sprintlink.net!aimnet.com!netserv.com!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news
From: Jon Bloom <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DC Rcvr w/DSP backend
Date: Tue, 19 Dec 1995 13:39:31 -0500
Organization: American Radio Relay League
Lines: 32
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References: <[e-mail]> <[e-mail]> <[e-mail]>
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Rocci wrote:
>
> David Feldman wrote:
> >
> > Well, not quite that sophisticated, but I've been trying an old Ten-Tec
> > PM3A transceiver (DC, 20 & 40M) feeding a Radio Shack DSP40 for audio
> > amplification and selectivity. The combo works reasonably well, but the
> > lack of AGC action in the Ten-Tec makes it awfully hard to hit the
> > preferred input level "window" of the DSP40. I suspect you'd want to
> > work out these AGC issues before getting too committed to this scheme.
> >
> I'm not sure what a DSP40 is, but I assume that it's some sort of audio
> filter. Of course, the problem with audio filtering in a DC receiver is that
> it does nothing to reject the image frequencies. A dual DSP at the
> quadrature outputs of two mixers would, theoretically, perform near perfect
> unwanted sideband cancellation.

Not only in theory but in reality, too. (See Campbell's Jan 1993 QST article.)
But in practice, "near-perfect" is problematic; you'll have trouble getting mo
re
than about 40 dB of opposite sideband rejection from this approach. It's
interesting to note that the current crop of commercial amateur-grade
transceivers that use DSP do the demodulation at a low IF (up to 15 kHz or so)
.
By processing a single IF signal (not two signals in quadrature), they elimina
te
any worries about amplitude and phase balance between two analog channels. Whi
le
such an approach is viable only in a superhet design, the complexity of the
needed superhet circuitry is not substantially more than that of a quadrature
D-C design.

------
Jon Bloom, KE3Z                   | [e-mail]
American Radio Relay League       |
225 Main St., Newington CT 06111  |


From Unknown Thu Dec 21 20:33:09 1995
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From: Rocci <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DC Rcvr w/DSP backend
Date: Thu, 21 Dec 1995 00:48:32 -0800
Organization: Net Access - Philadelphia's Internet Connection
Lines: 23
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
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X-Mailer: Mozilla 2.0b2a (Windows; I; 16bit)

Jon Bloom wrote:

> Not only in theory but in reality, too. (See Campbell's Jan 1993 QST article
.)
> But in practice, "near-perfect" is problematic; you'll have trouble getting
more
> than about 40 dB of opposite sideband rejection from this approach. It's
> interesting to note that the current crop of commercial amateur-grade
> transceivers that use DSP do the demodulation at a low IF (up to 15 kHz or s
o).
> By processing a single IF signal (not two signals in quadrature), they elimi
nate
> any worries about amplitude and phase balance between two analog channels. W
hile
> such an approach is viable only in a superhet design, the complexity of the
> needed superhet circuitry is not substantially more than that of a quadratur
e
> D-C design.

Traditional phasing DC receivers are limited to about 40 dB of sideband reject
ion because it
is very difficult in hardware to obtain the amplitude and phase balance requir
ed to achieve
total cancellation. On the other hand, if the local oscillator were supplied b
y the
quadrature outputs of an NCO, and the audio phase shifting was done in softwar
e (DSP), then
the only source of imbalance would be the differences between the two mixers,
nes pas?
Thereafter, every conceivable AGC, selectivity, and noise reduction feature wo
uld come
almost "free" because they would all be software functions.

Joe
WA3CMQ


From Unknown Thu Dec 21 20:33:10 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!info.ucla.edu!galaxy.ucr.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (wayne barnhart)
Newsgroups: rec.radio.amateur.homebrew
Subject: design transfer
Date: 19 Dec 95 06:56:00 GMT
Organization: ucsd usenet gateway
Lines: 14
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

>Does anyone know of a simple way of getting PC board artwork from a
>laser printout to the PCB material for etching?


Can you run a transparancy through your laser printer? If not take the
artwork down to a copy shop and they can do it. Coat your board with
photo-resist and lay the transparance on top. Used to do it this way in the
old (?) days.

:)

Wayne Barnhart  WB7WHI                               Dirt is good!
Spokane, Wa.



From Unknown Thu Dec 21 20:33:11 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!nntp.coast.net!torn!nott!bcarh189.bnr.ca!bcarh8ac.bnr.ca!bcarh8ab.bnr.ca!bgtyi23
From: [e-mail] (Bill Kirkland)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: design transfer
Date: 19 Dec 1995 14:45:27 GMT
Organization: Bell Northern Research Ltd.
Lines: 14
Message-ID: <4b6j67$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: bgtyi23.bnr.ca
X-Newsreader: News Xpress Version 1.0 Beta #4

In article <[e-mail]>,
   [e-mail] (wayne barnhart) wrote:
>>Does anyone know of a simple way of getting PC board artwork from a
>>laser printout to the PCB material for etching?
>
>
>Can you run a transparancy through your laser printer?

I've found that a single transparency is not dark enough.  Hold it up to a
light and you will probably be able to see plenty of pin holes.  I have heard
that layering 3 copies together works. This may not be good enough for very
fine detail work.

Bill Kirkland


From Unknown Thu Dec 21 20:33:12 1995
Path: news.epix.net!news.sprintlink.net!news.eznet.net!news.enterprise.net!btnet!newsfeed.internetmci.com!in2.uu.net!news.iadfw.net!usenet
From: [e-mail] (Kerry Miller)
Newsgroups: rec.radio.amateur.homebrew
Subject: EUREKA!  QRP Plans Found!
Date: Wed, 20 Dec 1995 02:56:42 GMT
Organization: Internet America
Lines: 20
Message-ID: <4b7u25$[e-mail]>
NNTP-Posting-Host: dal19-12.ppp.iadfw.net
X-Newsreader: Forte Free Agent 1.0.82

Ok, so now the whole internet world knows how disorganized my shack
really is!  I found the article about the 40m and 80m transmitters,
called "ether duster" and "wave bender".  I was close.

The article was in the May, 1991 73 Magazine, pages 26 through 29.
Don't panic, most of it is advertising (way to go, Wayne...).  The 80m
version uses a color burst xtal and 4 - 2n 3904's in the the final.
the 40m version has fewer parts and has a pair of 2n3904's.  I used
2n2222's because I had a bag full and it didn't matter if I blew up a
few!

More references to come, I'll try to scan some of this stuff in after
Christmas.
73,
Kerry Miller
[e-mail]

PS  MERRY CHRISTMAS!




From Unknown Thu Dec 21 20:33:13 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!prodigy.com!usenet
From: [e-mail] (K Short)
Newsgroups: rec.radio.amateur.homebrew
Subject: Ext mic mod for HTX-202 and HTX-404
Date: 20 Dec 1995 15:56:35 GMT
Organization: Prodigy Services Company  1-800-PRODIGY
Lines: 7
Distribution: world
Message-ID: <4b9bnj$[e-mail]>
NNTP-Posting-Host: inugap3.news.prodigy.com
X-Newsreader: Version 1.2

  There is a web page that describes how to modify the ext speaker
mic sold by Radio Shack.   The modified mic will provide the proper
level needed by the radio for good modulation.  The information
can also be applied to other brands of speaker mic's.  Check out :

http://pages.prodigy.com/CA/LA/htx202htx404/htx202htx404.html



From Unknown Thu Dec 21 20:33:14 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!ddsw1!news.mcs.net!mcs.com!jmjones
From: [e-mail] (John M. Jones)
Newsgroups: rec.radio.amateur.homebrew
Subject: fire alarm supervisory circuit
Date: Wed, 20 Dec 1995 20:50:54 UNDEFINED
Organization: MCSNet Internet Services
Lines: 10
Message-ID: <[e-mail]>
NNTP-Posting-Host: jmjones.pr.mcs.net
Keywords: alarm
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #1]

Anyone have some info on old fire alarm circuit which used end-of-line
resistor and pair of relays.  One was energized continuously by current flow
thru circuit which on an open would cause trouble alarm.  N/O detectors were
wired in parallel with e-o-l resistor and would operate alarm relay if any one

closed.  Values of resistor and coil voltages/resistance etc would be greatly
appreciated.

**------------------------------**
John M. Jones, Lombard, Illinois
email: [e-mail]


From Unknown Thu Dec 21 20:33:15 1995
Path: news.epix.net!news.sprintlink.net!rain.fr!jussieu.fr!math.ohio-state.edu!usc!chi-news.cic.net!newsfeed.internetmci.com!in2.uu.net!munnari.OZ.AU!news.uwa.edu.au!classic.iinet.com.au!news
From: [e-mail] (David Brown)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.swap,rec.audio.tubes
Subject: FS: Valves (tubes)
Date: 19 Dec 1995 17:53:24 GMT
Organization: iiNet Technologies
Lines: 21
Message-ID: <4b6u6k$[e-mail]>
NNTP-Posting-Host: jazz117.dy.iinet.net.au
Mime-Version: 1.0
Xref: news.epix.net rec.radio.amateur.homebrew:12278 rec.radio.swap:53516 rec.audio.tubes:3557

I have the following unused tubes for sale:

5Y3GT                  43
6AV6                   42
6AQ5                   28
EL85                   29
5933S (807 equivalent) 30
955/VT121 (acorns)     22
OB2                    10
108C1                   5
6AX5GT                  5
6J6                   567!!


Please email for details if interested.
--
 ______________________       ____________________________________
        email                        Red Pepper WWW page
  [e-mail]         http://www.iinet.com.au/~dmbrown/
 ______________________       ____________________________________



From Unknown Thu Dec 21 20:33:15 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (GDentHouTX)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: graphics
Date: 19 Dec 1995 19:59:53 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 5
Sender: [e-mail]
Message-ID: <4b7n69$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

FWIW (I'd hate to get flamed for being "an AOL newbie"...I have had .edu
and .compuserve addresses for some time) I just thought my computer had
locked up!!
Lost track of how many minutes (on a 14.4-dedicated line) and when
downloaded the (admittedly lame) default AOL viewer won't display.


From Unknown Thu Dec 21 20:33:16 1995
Path: news.epix.net!news.sprintlink.net!news.us.world.net!guardian.up.edu!gateway.sequent.com!news.orst.edu!news.uoregon.edu!mayonews.mayo.edu!newsdist.tc.umn.edu!umn.edu!spool.mu.edu!howland.reston.ans.net!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (wayne barnhart)
Newsgroups: rec.radio.amateur.homebrew
Subject: graphics
Date: 19 Dec 95 22:40:00 GMT
Organization: ucsd usenet gateway
Lines: 12
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Drilling PC boards  Simple PC Board Drilling Machine -


I don't want to sound like a stick in the mud but couldn't this have been
uploaded somewhere where those interested could access it? I believe that
those hooked up to a commercial service like AOL and not directly tied to
the Internet are paying the many bucks to get this list.
No flame, just a comment...

Wayne Barnhart  WB7WHI                               Dirt is good!
Spokane, Wa.



From Unknown Thu Dec 21 20:33:17 1995
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr7ip18.azstarnet.com!user
From: [e-mail] (Jim Mandaville)
Newsgroups: rec.radio.amateur.homebrew
Subject: HF installation in Toyota pickup
Date: Wed, 20 Dec 1995 07:53:44 +0600
Organization: Arizona Daily Star - AZSTARNET
Lines: 10
Message-ID: <[e-mail]>
NNTP-Posting-Host: usr7ip18.azstarnet.com

   I expect to take delivery of a new Toyota pickup soon and wonder if
anyone has had experience installing an HF rig and antenna in one.  I'd be
interested to know of mechanical arrangements that have worked and
especially whether any unusual receiving noise problems or car electronics
problems were encountered.  If so, any solutions.  My tentative plan is to
install a screwdriver or bugcatcher at the outer left rear of the bed.
There will be a fiberglass shell, which hopefully will have little effect
on the antenna.  Thanks and 73.

Jim, KG5KP


From Unknown Thu Dec 21 20:33:18 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!usc!news.cerf.net!newsserver.sdsc.edu!acsc.com!news.trw.com!news.rc.trw.com!rathbun.rc.trw.com!user
From: [e-mail] (Randall L. Rathbun)
Newsgroups: rec.radio.amateur.homebrew
Subject: High Dynamic Range, Low Phase Noise Front End
Date: Wed, 20 Dec 1995 12:54:13 -0700
Organization: TRW S&EG - San Diego
Lines: 8
Message-ID: <[e-mail]>
NNTP-Posting-Host: rathbun.rc.trw.com

Can anyone point me to recent work on low phase noise, high dynamic range
receiver front ends? I am looking for something comparable to the new
Icomm750 DSP with 105dbm dynamic range and excellent phase noise for the LO.
QST had a Feb 93 article on it, but I am looking for newer information.
Digitally synthesized oscillators are the magic words. Thanks for your help!
Please email responses to:
                            [e-mail]
- Randall NG6J


From Unknown Thu Dec 21 20:33:19 1995
Path: news.epix.net!news.sprintlink.net!aimnet.com!news.exodus.net!uunet!in1.uu.net!news.pcix.com!root
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Home Brew Laser Comms
Date: 21 Dec 1995 19:39:14 GMT
Organization: a Digital Internet AlphaServer Site
Lines: 1
Message-ID: <4bcd52$[e-mail]>
NNTP-Posting-Host: k-pm-dyn2.pcix.com
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)




From Unknown Thu Dec 21 20:33:20 1995
Path: news.epix.net!news.sprintlink.net!aimnet.com!news.exodus.net!uunet!in1.uu.net!news.pcix.com!root
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Home Brew Laser Comms
Date: 21 Dec 1995 19:41:54 GMT
Organization: a Digital Internet AlphaServer Site
Lines: 8
Message-ID: <4bcda3$[e-mail]>
NNTP-Posting-Host: k-pm-dyn2.pcix.com
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

Gudday,
Dave here still looking to QSO with Laser Types. I recently changed Server and
 lost the addresses.
Please re-mail to me and lets share Laser Stories.
I'm using 5mw diodes for transmit, and PIV-transimpedance amps. So far 12 mile
s comms. with
plenty of sigs left over.
Hw?
daveaa1a @pcix.com



From Unknown Thu Dec 21 20:33:21 1995
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From: "Ken (KC6TEU)" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How to add AGC to a Tube Radio?? (Swan 250)
Date: 19 Dec 1995 21:53:12 GMT
Organization: Intel Corporation
Lines: 27
Message-ID: <4b7c88$[e-mail]>
References: <495ui8$[e-mail]> <49hph7$[e-mail]> <49t4fn$[e-mail]> <4a07jb$[e-mail]> <4a5dke$[e-mail]> <4aiaoc$[e-mail]> <4aic53$[e-mail]> <[e-mail]> <[e-mail]>
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[e-mail] (WB3U) wrote:
>   [e-mail] (Steve Ellington) wrote:
>
>>The 250 had agc. Maybe you're expecting too much. AGC controls the gain
>>of the IF stages based on the strength of the signal at the detector.
>
>I'm not familiar with the 250's specific AGC circuit, but older rigs
>often didn't have the control range we expect by today's standards.
>Maybe it's not working.  Is the S-meter moving?
>
>73,
>Jack  WB3U
>

Jack,

This is an older radio, There is NO S Meter!!!! Just how good is that signal?
I say "Oh it sounds good...." I'll look at the schematic and look for somethin
g
that looks like a AGC control and see if I can improve it.

                           73,
                           Ken, KC6TEU
                           CM98LQ
                           [e-mail]





From Unknown Thu Dec 21 20:33:22 1995
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From: [e-mail] (Gary V. Deutschmann, Sr.)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: IC Chip Identification
Date: Sun, 17 Dec 1995 20:49:42 GMT
Organization: Inlink
Lines: 29
Message-ID: <4b1vop$[e-mail]>
References: <4b199c$[e-mail]>
NNTP-Posting-Host: slip108.inlink.com
X-Newsreader: Forte Free Agent 1.0.82

[e-mail](Paul Spaur ) wrote:

>Can someone identify this 16 pin dip IC
>with EUB0002B stamped on it.  It is on
>the pc board for a lead acid battery
>charger.  A source for them or any
>substitutes available would also help.
>Any help will be appreciated.
>Paul Spaur
>W6IJG
>E-mail   [e-mail]
Hi Paul

I ran across the same problem last year!

The 16-pin DIP is the charger circuit itself.  The numbers stamped on
the package are proprietary and not easily cross referenced.

However, I was able to obtain the chip from an ECG component supplier.
The replacement chip was unmarked, however, my original chips were
marked, UC3906 and UC2906 mfg. by Unitrode.

Apparently, the pin-out for all 16 pin charger chips are identical.

Sorry, that's all the help I can give.

Gary




From Unknown Thu Dec 21 20:33:23 1995
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From: [e-mail] (RRives)
Newsgroups: rec.radio.amateur.homebrew
Subject: Impedance matching HELP
Date: 19 Dec 1995 21:20:32 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 6
Sender: [e-mail]
Message-ID: <4b7rtg$[e-mail]>
Reply-To: [e-mail] (RRives)
NNTP-Posting-Host: newsbf02.mail.aol.com

I am trying to biuld a 15 meter amp for my mfj 9015 qrp rig. I need help
matching the 50 ohm output impedance of the rig to the low input
inpendance of the mrf 450 transistor that I am using for the amp. I would
like to use a pi-network to match the impedance but I dont know what the
input impedance of the transistor is. Can anyone help me. The amp is a
class C amp in the common emitter configuration.


From Unknown Thu Dec 21 20:33:24 1995
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Impedance matching HELP
Date: 20 Dec 1995 11:29:41 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 17
Sender: [e-mail]
Message-ID: <4b9dll$[e-mail]>
References: <4b7rtg$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <4b7rtg$[e-mail]>, [e-mail] (RRives)
writes:

>I am trying to biuld a 15 meter amp for my mfj 9015 qrp rig. I need help
>matching the 50 ohm output impedance of the rig to the low input
>inpendance of the mrf 450 transistor that I am using for the amp. I would
>like to use a pi-network to match the impedance but I dont know what the
>input impedance of the transistor is. Can anyone help me. The amp is a
>class C amp in the common emitter configuration.
>
>
>

The series equivilent input impedance is spec'ed at 1.56 -j.89 ohms at 30
MHz.

73 Tom


From Unknown Thu Dec 21 20:33:25 1995
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From: "Thomas C. J. Sefranek" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Impedance matching HELP
Date: 20 Dec 1995 14:08:39 GMT
Organization: SRC
Lines: 16
Message-ID: <4b95dq$[e-mail]>
References: <4b7rtg$[e-mail]>
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To: [e-mail]

Does it help if I repeat the book...?

@ 30 Mhz. 50 Watts, input = 1.56 - j.89

So, my guess is @ 21 Mhz, you'd have 1.75 ohms and -j1.0 .

Mind you!  It's a guess, but I bet a 5:1 transformer would work O.K.

Use a ferrite core intended for HF, 5 turns of small wire, (#20)
wrapped around a single turn of #16.

It's not optimized, but I've had great success anyway.

Tom
WA1RHP



From Unknown Thu Dec 21 20:33:26 1995
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From: [e-mail] (Watts)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Impedance matching HELP
Date: 20 Dec 1995 09:19:31 -0700
Organization: Colorado State University, Fort Collins, CO  80523
Lines: 8
Message-ID: <4b9d2j$[e-mail]>
References: <4b7rtg$[e-mail]> <4b95dq$[e-mail]>
NNTP-Posting-Host: lamar.acns.colostate.edu
X-Newsreader: TIN [version 1.2 PL2]

Thomas C. J. Sefranek ([e-mail]) wrote:
: Does it help if I repeat the book...?

Which book?  I recommend if you're going to build amps, etc that  you
go get (like, right now) the ARRL book 'Solid State Design for the Radio
Amateur".  It covers all these subjects and more.

galen, KF0YJ


From Unknown Thu Dec 21 20:33:27 1995
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usenet
From: Wes Stewart <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Impedance matching HELP
Date: 20 Dec 1995 22:16:39 GMT
Organization: Arizona Daily Star - AZSTARNET
Lines: 34
Message-ID: <4ba207$[e-mail]>
References: <4b7rtg$[e-mail]> <4b95dq$[e-mail]>
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"Thomas C. J. Sefranek" <[e-mail]> wrote:
>Does it help if I repeat the book...?

>@ 30 Mhz. 50 Watts, input = 1.56 - j.89

>So, my guess is @ 21 Mhz, you'd have 1.75 ohms and -j1.0 .

>Mind you!  It's a guess, but I bet a 5:1 transformer would work O.K.


Careful here.  Generally when speaking about impedance matching
transformers, it is the impedance ratio that is specified. In this
case, the turns ratio is given.

>Use a ferrite core intended for HF, 5 turns of small wire, (#20)
>wrapped around a single turn of #16.

Can't comment on the performance of this, however, matching this large
a ratio is usually done in a couple of steps especially when reactive
matching.

>It's not optimized, but I've had great success anyway.

Good old ham ingenuity at work.
>
>Tom
>WA1RHP
>

Regards,

Wes -- N7WS




From Unknown Thu Dec 21 20:33:28 1995
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From: [e-mail] (Jim Stafford-W4QO)
Newsgroups: rec.radio.amateur.homebrew
Subject: Info on QRP kits
Date: 20 Dec 95 20:49:55 GMT
Organization: ucsd usenet gateway
Lines: 18
Message-ID: <Pine.SV4.3.91.951220154929.5329M-100000@atl1>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]


For the price/performance, most folks prefer the kits put out by the
major QRP clubs to the commercial ventures, although many of them are
fine quality.  IMHO, I personally would check with owners of the Ramsey kits
before buying them.  Check this www site for reviews etc.

http://qrp.cc.nd.edu/qrp-l/

or join the QRP list at [e-mail] with

subscribe qrp-l <name> <call>

The unit in Nov 1994 QST from NN1G is a very popular unit for 80, 40, 30,
20 single band.  Good luck.

73/72/jim/w4qo




From Unknown Thu Dec 21 20:33:29 1995
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From: [e-mail] (D W Hemphill KC5NG)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Info on QRP kits and QRP rigs
Date: 18 Dec 1995 16:46:18 GMT
Lines: 11
Message-ID: <4b45sq$[e-mail]>
References: <Pine.SOL.3.91.951214113457.27425A-100000@coinc0>
NNTP-Posting-Host: dhemphill.dseg.ti.com
Mime-Version: 1.0
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I like the NN1G designs (there are several, all are superhet
transceivers with VFO control on tx and rx).  You can contact
the inventor, Dave Benson, NN1G, via e-mail:

   [e-mail]

I've built three of his rigs, and like them all!

73 / 72,
             Dean KC5NG, QRP-ARCI # 8204



From Unknown Thu Dec 21 20:33:30 1995
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From: James Garland <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Info on QRP kits and QRP rigs
Date: 18 Dec 1995 13:56:23 GMT
Organization: The Ohio State University
Lines: 7
Message-ID: <4b3ru7$[e-mail]>
References: <Pine.SOL.3.91.951214113457.27425A-100000@coinc0> <4b01sb$[e-mail]>
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Probably the most sophisticated QRP kits are the ARK-series (ARK-40 is 40
meters, ARK-20 is 20 meters, etc.) by S&S Engineering. They're frequency
synthesized cw transceivers, with an xtal filter, audio filter, digital
frequency selection, and built-in keyer. They're built like a tank, with
extremely high quality innards. Not for beginners, however.
Jim W8ZR



From Unknown Thu Dec 21 20:33:31 1995
Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news-feed.mci.newscorp.com!news2.near.net!xap!usenet
From: Phil <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Info on QRP kits and QRP rigs
Date: 17 Dec 1995 15:50:59 GMT
Organization: XYPLEX
Lines: 16
Message-ID: <4b1e93$[e-mail]>
References: <Pine.SOL.3.91.951214113457.27425A-100000@coinc0>
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To: [e-mail]

Drew:

I have to agree with Kerry on the 40 and 80 meter QRPers.
I have built the 80 meter job and it worked great. I had a
long contact too.

For simple kits you might want to look at Ramsey
Electronics. I built several of their kits and with the
exception of being short of parts in the list, whioh they
replaced at my concerned request, the units worked
excellent.

Good luck!

Phil KA1NHZ



From Unknown Thu Dec 21 20:33:32 1995
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From: David Skinner <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Low power FM transmitter ICs
Date: Tue, 19 Dec 1995 21:04:30 GMT
Organization: Home
Lines: 25
Distribution: world
Message-ID: <[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: drspc.demon.co.uk
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X-Newsreader: Newswin Alpha 0.6
X-Mail2News-Path: relay-4.mail.demon.net!post.demon.co.uk!drspc.demon.co.uk

Can anyone help me??

Do any of the major semiconductor manufacturers make an off-the-shelf
IC which operates as a low power FM transmitter? You know, the sort
of thing one might use to build a cordless baby alarm or bugging
device.

Thanks in advance for any info!


(P.S. I already posted this question once but, for some unexplained
reason, my news software changed "FM" into "FX" in both the subject
line and in the post itself! I would put one such mistake down to
a typo but *exactly the same mistake twice??* I don't think so! It'll
be interesting to see if the same happens this time!)

--

David Skinner                       [e-mail]
PGP key available on request
===========================================================
  Reality.sys corrupted. Universe halted. Reboot(Y/N) ?
===========================================================



From Unknown Thu Dec 21 20:33:33 1995
Path: news.epix.net!news.sprintlink.net!news.dpc.net!news.heurikon.com!uwvax!uwm.edu!vixen.cso.uiuc.edu!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!frankensun.altair.com!sdd.hp.com!hpscit.sc.hp.com!rkarlqu
From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Lowest PC Memory Prices!
Date: 18 Dec 1995 07:30:01 GMT
Organization: Hewlett-Packard
Lines: 21
Message-ID: <4b359p$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: hpscrj.scd.hp.com

In article <[e-mail]>,
Rudy  <[e-mail]> wrote:
>High Sales Volume = Lowest Prices!
>
>Because of high volume sales to the US Government, State
>Government, and National Laboratories, Atomic City Electronics,
>Inc. of Los Alamos, New Mexico is offering PC memory at
>outstanding prices:
>
>4 MB  (1X32) $129.95
>8 MB  (2X32) $249.95
>16 mb (4x32) $479.95
>
>All are new NP 70 ns 72 pin Simms.
>
>Call [phone]: Ask for Rudy.
>FAX  [phone]: Attention Rudy.

FWIW, these prices are about 25% higher than the street
price at any of the usual outlets in Silicon Valley (e.g. Fry's, etc.)



From Unknown Thu Dec 21 20:33:34 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!blackbush.xlink.net!news.uni-mainz.de!news.th-darmstadt.de!uni-erlangen.de!lrz-muenchen.de!kue!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Mailbox Frequencies
Date: 18 Dec 1995 19:45:49 GMT
Organization: Katholische Universitaet Eichstaett
Lines: 37
Message-ID: <4b4gdd$[e-mail]>
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Hello dear OMs!

I'm a newcomer in amteur radio, and I am fascinated from digital communication
 especially on
short wave. So I thought it may be the best solution to write a message in the
 internet, maybe
there will be someone who can help me:

1. I'm looking for all kinds of rtty, packet and amtor mailboxes. I'm interest
ed in the
callsigns and the frequencies. (in amtor: call & selcall!)

2. I'm looking for the frequencies of fax- stations for receiving all kinds of
 fax, especially
wefax.

3. I'm looking for the frequencies of all kinds of commercial transmissions, w
hich are not
encoded.

4. I'm running a pk232 mbx with pc-pakratt software. I'm looking for a PC- sof
tware, which is
able to decode the numbers which are transmitted in the weather reports on rtt
y, and a programm
which decodes the navtex code.


I hope that there will be somebody, who can help me, and send the message via
e-mail to me.
My call is DL2MHL (I'm not QRV in UHF or VHF packet)


Thanks already now, and best 73

I wish you a good 1996


Stephan  DL2MHL

e-mail:      [e-mail]







From Unknown Thu Dec 21 20:33:35 1995
Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!chi-news.cic.net!usc!howland.reston.ans.net!swrinde!sdd.hp.com!hpscit.sc.hp.com!rkarlqu
From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Measuring phase-noise with HP 8640B
Date: 18 Dec 1995 07:27:20 GMT
Organization: Hewlett-Packard
Lines: 24
Message-ID: <4b354o$[e-mail]>
References: <4akj87$[e-mail]> <[e-mail]>
NNTP-Posting-Host: hpscrj.scd.hp.com

In article <[e-mail]>,
David Stockton <[e-mail]> wrote:
>
>
>    Commercial phase noise testers are fine if you have access to them
>but may not be adequate for true state of the art work.
>
>    VCXO mixdown will outperform the 8640 and threaten the commercial
>tester, for an even lower price but is 1 freq per VCXO
>
>    Mixdown of an identical pair of the devices under test can be
>similarly cheap AND state of the art.
>
>   Cheers
>          David  GM4ZNX

Regarding the "state-of-the-art" in phase noise measurement:

For the record, the state-of-the-art is owned by the patented
cross-correlation system sold by Femtosecond Systems in Boulder, Co.
Far better than you would need for ham radio work.

Rick N6RK
[e-mail]


From Unknown Thu Dec 21 20:33:37 1995
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From: [e-mail] (JGRIB)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: MFJ QRP SSB Rigs - Worth the $$?
Date: 20 Dec 1995 15:27:31 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 13
Sender: [e-mail]
Message-ID: <4b9rjj$[e-mail]>
References: <4a7b8h$[e-mail]>
Reply-To: [e-mail] (JGRIB)
NNTP-Posting-Host: newsbf02.mail.aol.com

Hi,

I did use a 20 meter MFJ from the car with a Hustler mobile whip on the
rear quarter panel of the wagon. I worked a few stations in Fla, and one
in the USSR. It does work, the only reason I don't do it all the time is
the traffic here in Del. can be pretty nasty especially at rush hour. I
received reasonable (ie. 559, 439 etc.) signal reports from it. I wouldn't
want to run it say on 40 meters early in the afternoon due to the QRM from
broadcast stations, but it's fun for a change from 2 meters FM.

73,

Joe KI3B


From Unknown Thu Dec 21 20:33:38 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!newsfeed.internetmci.com!swrinde!cs.utexas.edu!geraldo.cc.utexas.edu!usenet
From: [e-mail] (Larry Braden)
Newsgroups: rec.radio.amateur.homebrew
Subject: need help identifying components
Date: 19 Dec 1995 05:30:39 GMT
Organization: University of Texas at Austin
Lines: 15
Message-ID: <4b5ilv$[e-mail]>
NNTP-Posting-Host: slip-40-9.ots.utexas.edu
X-Newsreader: WinVN 0.92.6+

I'm scavenging some components out of an old satellite receiver
and needed some help identifying components which I don't
have reference books on.

1. a Wavetek filter, metal can, with a black "25" on it.
2. IF transformer cans with "9050" on it
3. a six-legged (3 on each side) device from MiniCircuit Labs
        that is marked "T4-1" -- a transformer?

There's a bunch of nice ICs, mostly from Motorola, which I have
the data books on - no problem. Any help with any of the above
components would be greatly appreciated.

Thanks in advance. 73 Larry Braden KC5CWG



From Unknown Thu Dec 21 20:33:39 1995
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!usenet.seri.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!nntp-hub2.barrnet.net!news.Stanford.EDU!w6yx.stanford.edu!stevem
From: [e-mail] (Steve Muther)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: need help identifying components
Date: 19 Dec 1995 06:20:54 GMT
Organization: Stanford Amateur Radio Club
Lines: 30
Message-ID: <4b5lk6$[e-mail]>
References: <4b5ilv$[e-mail]>
NNTP-Posting-Host: w6yx.stanford.edu

In article <4b5ilv$[e-mail]> [e-mail] (Larry B
raden) writes:
>I'm scavenging some components out of an old satellite receiver
>and needed some help identifying components which I don't
>have reference books on.
>
>1. a Wavetek filter, metal can, with a black "25" on it.

        This is probably the IF bandpass filter.  Probably 70MHz
        center frequency with a bandwidth of 25MHz (just a guess).

>2. IF transformer cans with "9050" on it

        I believe JW Miller made IF cans with 9000 series part numbers.
        I don't seem to have one of their catalogs.

>3. a six-legged (3 on each side) device from MiniCircuit Labs
>       that is marked "T4-1" -- a transformer?

        This is a broadband RF transformer with a 4-1 turns ratio
        and is listed in the MiniCircuit Catalog.
>
>There's a bunch of nice ICs, mostly from Motorola, which I have
>the data books on - no problem. Any help with any of the above
>components would be greatly appreciated.
>
>Thanks in advance. 73 Larry Braden KC5CWG
>

Steve M.  WF6R.



From Unknown Thu Dec 21 20:33:41 1995
Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!newsfeed.internetmci.com!vixen.cso.uiuc.edu!usenet
From: Carl Gregory <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NMR physicist needs help in HF-circuit design
Date: 18 Dec 1995 17:11:44 GMT
Organization: Univ. of Illinois / Biomedical Magnetic Resonance Lab
Lines: 43
Message-ID: <4b47cg$[e-mail]>
References: <4as8n3$[e-mail]> <4asnni$[e-mail]> <4b0o2b$[e-mail]>
NNTP-Posting-Host: magnet.beckman.uiuc.edu
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X-URL: news:4b0o2b$[e-mail]

[e-mail] () wrote:
>One last (?) question:
>the whole trouble started when I tried to change from series resonators
>to parallel resonators in order to be able to tune externally and to
>hold losses along the line low. Using just a coil and after n*lambda/2
>a series C + paralle C would mean high VSWR and so high losses. Now what
>if I put the coil and the series C at one end, the matching parallel C
>at the other end of the line ? This would be a 'normal' (considering
>our probes) series-resonator, so more used to me. But would this
>also mean high losses along the line ? I think that the high voltages
>at resonance (that are responsible for the great losses, if just the
>coil is at one end) only occur between series C and coil, so that they
>would NOT be seen on the line in this concept. Am I right with this
>idea??

It all depends on the coil (and sample, to the extent that it modifies the
coil electrical characteristic, e.g. saline sample).  A typical setup
might be 100 nH, 1 ohm in the coil.  At 100 MHz, this is 1 ohm resistive,
63 ohm reactive.  No matter how you adjust it with a single component,
you will have a very high SWR on the line.

The losses (outside of the coil and sample) are actually caused mostly
by the CURRENT in the line, not by high voltages, unless you have some
undesirable materials near the high voltage points.

I find that a useful way to visualize the effects of the external circuit
is to imagine the magnetic fields associated with this circuit.  Energy
is stored in the magnetic fields.  What you want is for most of the stored
energy to be inside the sample, in order to have a high sensitivity.  Thus,
any conductor with high current and large size, which stores a
correspondingly large amount of energy, will detract from the probe
performance.


Carl Gregory
Biomedical Magnetic Resonance Laboratory
College of Medicine
University of Illinois
1307 W Park St
Urbana, IL 61801
(217)-244-2350




From Unknown Thu Dec 21 20:33:42 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (RRRath)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Phasenoise-FFT-offline
Date: 17 Dec 1995 08:24:57 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 36
Sender: [e-mail]
Message-ID: <4b15n9$[e-mail]>
References: <4b100h$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

Hi,

I have tested two shareware pgms with impressive dynamics which are much
slower then the freq4 or digitize:

a)hpwfft1.zip or hpwfft2.zip (more or less same, 1 MB)
  WINDOWS, for soundcards and BB7805 AD or an external
  20bitAD described  in German ELRAD.
  in Compuserve: midiforum and hamnet;
  ftp.ix.de/pub/elrad  area 20
  or http://ix.de/el
  More or less offline, impressive dynamics, up to 130db, in help file
some
  sample screenshots are included. FFT dsiplay and:
   table with  THD and SN, offset values etc
   Very large FFT with pay-version possible,
  My PAS 16 revealed: 2th harmonic -76db, 3rd -90db.

c) cheaper: NEW cooledit vers.152
  cool152.zip on cica-sites, compuserve, aol etc.
  allows recording and then FFT up to 120db dynamic,
  pgm also usefull for wavegeneration etc.

d) Errol Williams has written a FREE tool for wav-files
   WINDOWS;  incl. spectrum, voiceprint, 3d-spectrum
   not best dynamics, but very simple and versatile for recorded
   signals (e.g. shortwave etc)
   wavwev.zip (52K)  : ftp.tpoint.net/windows/sound

?? anybody knows better pgms?
 ?? anybody adapted for Zoom-FFT

73s and Merry Xmas from Munich
Robert DJ0RA, OE5RRL

ps: please use after dec.29th my CIS ID: 100626,[e-mail]


From Unknown Thu Dec 21 20:33:43 1995
Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re:Phono Preamp needed
Date: 21 Dec 95 19:40:43 GMT
Organization: ucsd usenet gateway
Lines: 14
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Call MCM electronics:

[phone]

Part number 40-630  page 272 of latest catalog.

Price  $13.50.

I'm amazed they still sell stuff like that for vinyl.

Ray Mack
WD5IFS
[e-mail]



From Unknown Thu Dec 21 20:33:44 1995
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!geraldo.cc.utexas.edu!usenet
From: [e-mail] (Larry Braden)
Newsgroups: rec.radio.amateur.homebrew
Subject: picking harmonics off of vfo inductor?
Date: 21 Dec 1995 15:50:30 GMT
Organization: University of Texas at Austin
Lines: 17
Message-ID: <4bbvo6$[e-mail]>
NNTP-Posting-Host: slip-49-7.ots.utexas.edu
X-Newsreader: WinVN 0.92.6+

A question for the more experienced builders -

Is it possible to successfully pick off the 2, 3,or 5th harmonic
off a VFO inductor by placing a coil wound for the harmonic close
to the inductor, both wound on a form positioned vertically off the
groundplane and trimmed with small trimmer caps?  Perhaps wrapping a
single link of insulated wire around both coils?

Or would the mutual inductance cause problems.  What I am wondering if
it isn't possible to pick off 50 mhz energy from a 10 mhz 30m vfo coil.
Of course, there are other more standard and successful approaches to
frequency doubling and tripling, but I am curious whether anyone has
tried this?

Thanks

Larry Braden KC5CWG


From Unknown Thu Dec 21 20:33:45 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!usenet.eel.ufl.edu!spool.mu.edu!howland.reston.ans.net!newsfeed.internetmci.com!chi-news.cic.net!news.nd.edu!news.bsu.edu!figmnt.tayloru.edu!jhschutt
From: [e-mail] (Dr. John Robert Schutt)
Newsgroups: rec.radio.amateur.homebrew
Subject: Pls Help with Digital Display
Message-ID: <[e-mail]>
Date: 21 Dec 95 12:43:20 -0500
Organization: Taylor University
Lines: 19

Thanks for reading this post.

Does anyone know of a reference that contains directions to build a digital
display for an older analog rig (specifically the TenTec Century 21.)  The 199
6
ARRL Handbook doesn't have one.  Do you know where I can find such a beast?

Alternatively, do you know of a manufacturer, kit or otherwise, who sells one?

I'd like to build/get one.

Thanks for your time.

John KB9KSM
______________________________________________________________________________
_
John Robert Schutt                         /\         [e-mail]
Taylor University- Fort Wayne             //\\        [phone]
1025 W. Rudisill Blvd.                   ///\\\       FAX: [phone]
Fort Wayne, IN 46807                       ||
------------------------------------------------------------------------------
-



From Unknown Thu Dec 21 20:33:46 1995
Path: news.epix.net!news.sprintlink.net!hookup!gatech!psuvax1!news.math.psu.edu!chi-news.cic.net!news.nd.edu!news.bsu.edu!bambi.tayloru.edu!jhschutt
From: [e-mail] (Dr. John Robert Schutt)
Newsgroups: rec.radio.amateur.homebrew
Subject: Pls Help with Digital Frequency Display
Message-ID: <[e-mail]>
Date: 19 Dec 95 16:37:22 -0500
Organization: Taylor University
Lines: 15

Can you help me?  I recently bought a TenTec Century 21 rig.  It's my first as
I'm a newbie.  I'd sure like to have a digital display to know the exact (or
close) frequency on which I'm transmitting.  Someone suggested that I get a
frequency counter.  Someone else suggested that I get a permanant digital
readout display.  Whatever I do, I'd like not to spend a fortune.  (If I had a
fortune, I'd have bought a digital rig in the first place :  )    )  So, what
do you pros recommend?  I think that I could build something if I had a kit or
perhaps even a schematic?  Can someone help me out?    THANKS in advance.--
______________________________________________________________________________
_
John Robert Schutt                         /\         [e-mail]
Taylor University- Fort Wayne             //\\        [phone]
1025 W. Rudisill Blvd.                   ///\\\       FAX: [phone]
Fort Wayne, IN 46807                       ||
------------------------------------------------------------------------------
-



From Unknown Thu Dec 21 20:33:48 1995
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usenet
From: Wes Stewart <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Pls Help with Digital Frequency Display
Date: 20 Dec 1995 14:38:58 GMT
Organization: Arizona Daily Star - AZSTARNET
Lines: 33
Message-ID: <4b9762$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: usr1ip42.azstarnet.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)
To: [e-mail]

[e-mail] (Dr. John Robert Schutt) wrote:
>Can you help me?  I recently bought a TenTec Century 21 rig.  It's my first a
s
>I'm a newbie.  I'd sure like to have a digital display to know the exact (or
>close) frequency on which I'm transmitting.  Someone suggested that I get a
>frequency counter.  Someone else suggested that I get a permanant digital
>readout display.  Whatever I do, I'd like not to spend a fortune.  (If I had
a
>fortune, I'd have bought a digital rig in the first place :  )    )  So, what
>do you pros recommend?  I think that I could build something if I had a kit o
r
>perhaps even a schematic?  Can someone help me out?    THANKS in advance.--
>_____________________________________________________________________________
__


Hi John:

I hope you don't take offense at this, no flame intended. My question
is, why do want better resolution than the Century 21 offers. A number
of years ago, I tought a radio class at the local Community Collage where
the radio club had one of these rigs. If memory serves me (always a dubious
proposition), the dial had at least 1-2 KHz accuracy, if not better.

If you avoid the band edge by this amount, why worry? Thousands of us
entered ham radio with equipment no better than this, often worse, and
everybody used to get by without a digital readout. I'm working weak-
signal tropo, meteor scatter and EME without one.

By all means build things, it's a great part of ham radio. If you build a
counter, fine, but don't do it because you are reluctant to operate without
it.

Best wishes for a long and fulfilling ham experience.

Wes -- N7WS



From Unknown Thu Dec 21 20:33:49 1995
Path: news.epix.net!news.sprintlink.net!chaos.aoc.nrao.edu!newshost.nmt.edu!baervan.nmt.edu!tesuque.cs.sandia.gov!ferrari.mst6.lanl.gov!newshost.lanl.gov!ncar!newsxfer.itd.umich.edu!agate!news.mindlink.net!van-bc!news.rmii.com!slip863.rmii.com!jay
From: [e-mail] (Jay de Halas)
Newsgroups: rec.radio.amateur.homebrew,sci.electronics.cad,sci.electronics
Subject: Re: Printing directly to PCB with an ink jet printer ?
Date: Sun, 17 Dec 1995 21:45:54 LOCAL
Organization: Rocky Mountain Internet Inc.
Lines: 16
Message-ID: <[e-mail]>
References: <[e-mail]> <4av4nn$[e-mail]>
NNTP-Posting-Host: slip863.rmii.com
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4]
Xref: news.epix.net rec.radio.amateur.homebrew:12217 sci.electronics.cad:5190 sci.electronics:162732

> It would seem that you should be able to put a pen in your
>cnc drilling machine and draw using it with proper software. Is it a home
>brew CNC drill or what. The basics of a plotter and a cnc machine are all
>the same.
>                                             Garry WB0NNO

True enough, but my CNC drill is a NCed Sherline mill, and it is slooow. I
would have to figure out a way to keep the pen from drying out. The main
reason I would like to use a ink jet is I want 10 mil lines with 10 mil
spacing. I have been able to get this with a laser printer, but with the
registration problems I mentioned before. I don't think I can get this kind of

resolution with a plotter, the lines would bleed together.

Jay




From Unknown Thu Dec 21 20:33:50 1995
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!usenet.kornet.nm.kr!agate!howland.reston.ans.net!Germany.EU.net!Hanover.Germany.EU.net!Hamburg.Germany.EU.net!nuki.NetUSE.de!Kiel.Germany.EU.net!tpki.toppoint.de!moki.toppoint.de!root
Date: 19 Dec 1995 21:18:00 +0100
From: [e-mail] (Moritz von Buttlar)
Newsgroups: sci.electronics,rec.radio.amateur.homebrew,sci.electronics.cad
Message-ID: <[e-mail]>
References: <[e-mail]> <4av4nn$[e-mail]>
        <[e-mail]>
Subject: Re: Printing directly to PCB with an ink jet printer ?
X-Newsreader: XP v3.02
MIME-Version: 1.0
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Lines: 18
Xref: news.epix.net sci.electronics:162933 rec.radio.amateur.homebrew:12251 sci.electronics.cad:5225

> > It would seem that you should be able to put a pen in your
> >cnc drilling machine and draw using it with proper software. Is it a home
> >brew CNC drill or what. The basics of a plotter and a cnc machine are all
> >the same.
> >                                             Garry WB0NNO


I'm using my cnc machine right now. I wrote a program that converts hpgl
files and controlls the cnc machine. If anybody needs something like that,
I can give it to you. Maybe I'll make shareware out of it.....
It's slow but it works pretty nice.

    Moritz

---------------------------
Moritz von Buttlar        | "Und denkt daran....Viel Wurstwasser trinken..
Kiel, Northern Germany    |    Das schaerft den Verstand !"     Werner
## CrossPoint v3.02 ##


From Unknown Thu Dec 21 20:33:51 1995
Path: news.epix.net!news.sprintlink.net!news.wwa.com!news
From: (GARY) KF9CM [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Printing to PCB material from a laser printer
Date: 17 Dec 1995 23:40:25 GMT
Organization: WorldWide Access (tm) - Chicagoland Internet Services (http://www.wwa.com)
Lines: 8
Message-ID: <4b29p9$[e-mail]>
NNTP-Posting-Host: vh3-050.wwa.com
X-Newsreader: AIR News 3.X (SPRY, Inc.)

You might try transparency film for plain paper copiers. You can find it at Of
fice Max
and then try photo ectching.


73 Gary KF9CM





From Unknown Thu Dec 21 20:33:51 1995
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!news.eas.asu.edu!news.asu.edu!aztec.asu.edu!ajsklar
From: [e-mail] (ALLEN SKLAR)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Printing to PCB material from a laser printer
Date: 20 Dec 1995 06:58:04 GMT
Organization: Arizona State University
Lines: 14
Message-ID: <4b8c5s$[e-mail]>
NNTP-Posting-Host: aztec.asu.edu


Hi All..
PnP Blue and  PnP wet has an add in Radio Fun...
The Company it called Techniks Inc
PO Box 463
Ringoes NJ 08551
 or Phone [phone]

I put the address here for info only...
I do not know anything about this company...
Enjoy..
de Allen AA7BJ

--


From Unknown Thu Dec 21 20:33:52 1995
Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!news.flinet.com!usenet
From: charles bolland <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.packet,rec.radio.amateur.policy
Subject: Radio Station Database Demo
Date: 19 Dec 1995 13:25:47 GMT
Organization: Florida Internet
Lines: 17
Message-ID: <4b6egr$[e-mail]>
NNTP-Posting-Host: wpb44.flinet.com
Mime-Version: 1.0
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Xref: news.epix.net rec.radio.amateur.homebrew:12241 rec.radio.amateur.misc:95775 rec.radio.amateur.policy:32254

Friends

For those who have received the RADIO STATION DATABASE DEMO,I may have typed t
he unzip
instructions incorrectly.  They should read as follows if they don't:

    PKUNZIP.EXE DATABASE.ZIP C:\DEMO2

If you did not get a copy of the DEMO and would like one, send your EMAIL addr
ess and
I will return the Demo to you via EMAIL

Thanks

Chuck Bolland
KA4PRF





From Unknown Thu Dec 21 20:33:53 1995
Path: news.epix.net!news.sprintlink.net!news.onramp.net!news.tcst.com!dildog.lgc.com!news.sesqui.net!oitnews.harvard.edu!purdue!news.bu.edu!bloom-beacon.mit.edu!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail](Dan Walker )
Newsgroups: rec.radio.amateur.homebrew
Subject: RAMSEY kits - converting from battery - Problem.
Date: 18 Dec 1995 23:28:59 GMT
Organization: Netcom
Lines: 15
Message-ID: <4b4tfr$[e-mail]>
NNTP-Posting-Host: ix-sd9-01.ix.netcom.com
X-NETCOM-Date: Mon Dec 18  3:28:59 PM PST 1995


I have a couple of Ramsey kits that run great on the battery, but when
I try to hook them up to a power supply they don't work as well.

My CW-7 keyer sounds like a strangled cat, and my VOX switch kit is
always on.

Both work perfect with a 9V battery.

The CW-7 is hooked up to 12vdc power supply and the VOX is hooked up
via a 7808 regulator.

Any suggestions?

de KE6LBX


From Unknown Thu Dec 21 20:33:54 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (PFZouave)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RAMSEY kits - converting from battery - Problem.
Date: 19 Dec 1995 12:17:45 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 32
Sender: [e-mail]
Message-ID: <4b6s3p$[e-mail]>
References: <4b4tfr$[e-mail]>
Reply-To: [e-mail] (PFZouave)
NNTP-Posting-Host: newsbf02.mail.aol.com

> I have a couple of Ramsey kits that run great on the battery, but when
>I try to hook them up to a power supply they don't work as well.

Several things come to mind:

1) Is the regulator you are using connected properly? (If you monitor the
voltage on the output side of the regulator, are you seeing the voltage
that you expect to see? Done assume! Check it with a voltmeter!

2) I am not familiar with the 7808. Is this a variable voltage regulator,
or a fixed 8 volt device? If the latter, this may be your problem. Maybe
your 9 volt equipment *needs* 9 volts!

3) Are you using the recommended filtering/decoupling capacitors? The app
notes I have seen for the 7805, for example, usually feature a small
electrolytic cap on the input side, and something on the order of .1uf on
the output side (with respect to ground). If your equipment is analog in
nature and more sensitive, you might need more extensive filtering. If you
can, check the output with a scope.

4) Does your 12 volt supply have sufficient *current* capacity to power
your equipment? What is the milliamp requirements of your equipment, and
what is the milliamp capacity of your 12 volt supply? Obviously, the sum
of the former values should be less that the latter value.

Hope that helps!
/=====================================================/
/                                [e-mail]
                   /
/     The absurdity of a claim is not a valid measure of its probability
       /
/=====================================================/


From Unknown Thu Dec 21 20:33:55 1995
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!news.ti.com!news.dseg.ti.com!usenet
From: [e-mail] (D W Hemphill KC5NG)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RAMSEY kits - converting from battery - Problem.
Date: 19 Dec 1995 18:17:29 GMT
Lines: 8
Message-ID: <4b6vjp$[e-mail]>
References: <4b4tfr$[e-mail]>
NNTP-Posting-Host: dhemphill.dseg.ti.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.5

Poor regulation?  Too much ripple?  Maybe 8v not enough?
Try inserting two 1N4001 diodes in series in the ground
lead of the 7808 to raise it 1.4v higher, making it act
like a "7809.4" (hi hi).  I've seen ckts that were kinda
picky about voltage, this may help.

                             GL de KC5NG ar k



From Unknown Thu Dec 21 20:33:56 1995
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!news.ti.com!news.dseg.ti.com!usenet
From: [e-mail] (D W Hemphill KC5NG)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RAMSEY kits - converting from battery - Problem.
Date: 19 Dec 1995 18:30:27 GMT
Lines: 8
Message-ID: <4b70c3$[e-mail]>
References: <4b4tfr$[e-mail]> <4b6vjp$[e-mail]>
NNTP-Posting-Host: dhemphill.dseg.ti.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.5

I got to thinking after I posted my first response.  Could also
be common mode hum or something along those lines.  Try adding
bypass caps on all leads into and out of the equipment.  if it
seems like an RF problem, also use shielded cables in addition
to the bypass caps.

                             GL de KC5NG ar k



From Unknown Thu Dec 21 20:33:57 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (MikeHeit)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RAMSEY kits - converting from battery - Problem.
Date: 20 Dec 1995 11:30:27 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 15
Sender: [e-mail]
Message-ID: <4b9dn3$[e-mail]>
References: <4b70c3$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

I had problems with common-mode hum in a Ramsey receiver kit.
The unit would sound fine when powered from batteries but hum like
crazy when connected to a power supply.

Be sure your power supply is filtered properly, including bypass
capacitors on all leads to and from the kit.  Use shielded cables,
too. All these things helped with my kit, but I didn't completely
eliminate the hum until I modified the power supply itself, adding
bypass and filter capacitors in various places.

Good tips for fixing  common mode hum can be found in several
textbooks, including the QRP Notebook.


73 de Mike - KF0SO


From Unknown Thu Dec 21 20:33:58 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!usenet.seri.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!vixen.cso.uiuc.edu!howland.reston.ans.net!EU.net!peer-news.britain.eu.net!bcc.ac.uk!news
From: paula mcketty <[e-mail]>
Subject:  RE : Shortwave radio
Message-ID: <[e-mail]>
Date: Thu, 21 Dec 1995 13:23:35 GMT
Organization: University College London
Lines: 21

I am a keen shortwave lintener. In my search for perfection I have
decided to attempt to build a shortwave radio based on DIGITAL sampling
techniques. I am looking for a design that can :

1. Sample a 0Mhz - 30Mhz signal, digitally filter and pick out desired
program.

2. Any other high performance method.


I know this is asking a lot but that must be a "WHIZZ" kid out there
that knows a design or some way of doing this! Oh additonally the design
must be as economically restrained as possible.

My initial thoughts around the problem were to use a standard front end
and mix the incoming singnal down to somthing more managable but this presente
d
more problems!

Thanks! for any idears given!




From Unknown Thu Dec 21 20:33:59 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!btnet!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.audio.tech,rec.radio.amateur.homebrew
Subject: Re: RIAA Preamp for Mag Cartridge
Date: Tue, 19 Dec 95 21:30:34 GMT
Lines: 14
Message-ID: <[e-mail]>
References: <4b7ach$[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
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X-Newsreader: News Xpress Version 1.0 Beta #4
Xref: news.epix.net rec.audio.tech:25939 rec.radio.amateur.homebrew:12253

 [e-mail] wrote:

>The problem I have is a turntable with a magnetic cartridge (output
>around 2mv) and a mini stereo system which only has an AUX input
>(around 700mv) and I need to get the output from the turntable up to a
>suitable level to drive the system.

I wouldn't even bother trying to build something.  Go to a large stereo
service company and tell them you need a junker.  Then just rip out the
phono preamp/EQ circuitry.

73,
Jack  WB3U


From Unknown Thu Dec 21 20:34:00 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.mathworks.com!satisfied.apocalypse.org!wizard.pn.com!news.zeitgeist.net!news.pixi.com!usenet
From: [e-mail]
Newsgroups: sci.electronics.design,rec.audio.tech,rec.radio.amateur.homebrew
Subject: Re: RIAA Preamp for Mag Cartridge
Date: Thu, 21 Dec 1995 02:08:58 GMT
Organization: Pacific Information eXchange, Inc.
Lines: 26
Message-ID: <4bamjb$[e-mail]>
References: <4b7ach$[e-mail]>
NNTP-Posting-Host: dialup014.ohana.com
X-Newsreader: Forte Free Agent 1.0.82
Xref: news.epix.net sci.electronics.design:638 rec.audio.tech:25974 rec.radio.amateur.homebrew:12274

[e-mail] wrote:

>The problem I have is a turntable with a magnetic cartridge (output
>around 2mv) and a mini stereo system which only has an AUX input
>(around 700mv) and I need to get the output from the turntable up to a
>suitable level to drive the system.  I guess I will need RIAA
>compensation as well.
>Can anyone help me with a suitable design, probably built around a
>single IC.  I have 12V DC available in the turntable so power should
>not be a problem.

>Thanks in advance

>Dick Vogt ([e-mail])


There used to be cheap phono preamps available for your application at
radio shack (ack) and other parts suppliers.  Call around and see what
you can find.  If there are no more, e-mail me and I'll find you
something.  Why not canibalize and old stereo am;plifier from a swap
meet or garage sale?  The phono preamps were often on dedicated PCB's.


Erik Nagley
[e-mail]



From Unknown Thu Dec 21 20:34:01 1995
Newsgroups: sci.electronics.design,rec.audio.tech,rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.yab.com!wierius!stat!nntpdist.primenet.com!nntpgate.primenet.com!nntp.news.primenet.com!news.texas.net!imci2!newsfeed.internetmci.com!in1.uu.net!psinntp!psinntp!psinntp!psinntp!voder!nsc!news
From: [e-mail] (Paul Grohe)
Subject: Re: RIAA Preamp for Mag Cartridge
Message-ID: <[e-mail]>
Sender: [e-mail] (netnews maintenance)
Nntp-Posting-Host: mil.nsc.com
Reply-To: [e-mail]
Organization: National Semiconductor
X-Newsreader: Forte Free Agent 1.0.82
References: <4b7ach$[e-mail]> <[e-mail]>
Date: Wed, 20 Dec 1995 20:42:23 GMT
Lines: 30
Xref: news.epix.net sci.electronics.design:648 rec.audio.tech:25989 rec.radio.amateur.homebrew:12279

In the newsgroup sci.electronics.design.
[e-mail] (Paul Grohe) from
National Semiconductor unthoughtfully misposted:

:Burr-Brown     http://burr-brown

OOPS!

Burr Brown      http://www.burr-brown.com

Sorry...Dain Bramage! %^}

Regards,
Paul Grohe


---------------------------------------------------------------
 Paul Grohe                     National Semiconductor Corp.
 Sr. Electronics Technician     2900 Semiconductor Drive
 AMPS New Products Eng Group    Mail Stop C2693
 Email:  [e-mail]   Santa Clara, CA. 95052-8090 USA
 [phone] Tel             [phone] Fax

 For technical assistance, literature, or samples call
 Canada & US: [phone]    Europe: (49) 814 110-3720
 Email Support:                 mailto:[e-mail]
 NSC datasheets online at:      http://www.natsemi.com
 Usenet Disclaimer: Any opinions expressed are mine, not NSC's
---------------------------------------------------------------



From Unknown Thu Dec 21 20:34:02 1995
Path: news.epix.net!news.sprintlink.net!sparky.midwest.net!usenet
From: [e-mail] (Gayle Albert)
Newsgroups: rec.radio.amateur.homebrew
Subject: RS-232 Specification
Date: Tue, 19 Dec 1995 19:08:41 GMT
Organization: Midwest Internet
Lines: 19
Message-ID: <4b8sd2$[e-mail]>
NNTP-Posting-Host: dial4-8.midwest.net
X-Newsreader: Forte Free Agent 1.0.82

Hello, Folks:

Since I have had little, if any, luck getting an RS-232 cable for
multiple nodes to work and even less luck with buying a commercial
unit, I have decided to just do what I should have done to start
with... Design one.

I am hoping that someone on the group can save me some time and point
me to a site that has the IEEE spec for the RS-232 port. No sense in
doing just another non-standard system that works some of the time...
We have plenty of those already!

Thanks!


Marty Albert -- KC6UFM
PO Box 717
Fredericktown, MO  63645



From Unknown Thu Dec 21 20:34:03 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!nntp.coast.net!zombie.ncsc.mil!news.duke.edu!godzilla5.acpub.duke.edu!jimbob
From: "James P. Meyer" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RS-232 Specification
Date: Wed, 20 Dec 1995 12:37:05 -0500
Organization: Duke University, Durham, NC, USA
Lines: 17
Message-ID: <[e-mail]>
References: <4b8sd2$[e-mail]>
NNTP-Posting-Host: godzilla5.acpub.duke.edu
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <4b8sd2$[e-mail]>

On Tue, 19 Dec 1995, Gayle Albert wrote:

> Since I have had little, if any, luck getting an RS-232 cable for
> multiple nodes to work and even less luck with buying a commercial
> unit, I have decided to just do what I should have done to start
> with... Design one.

        RS-232 was never intended to work with multiple nodes.  If you
design something that *does*, you will have designed something that is
*not* compatable with RS-232.

        RS-422 or RS-485 may be what you really want.  I'm sure a little
searching will locate a .faq or three or twenty that will help.

        Jim




From Unknown Thu Dec 21 20:34:04 1995
Path: news.epix.net!uunet!in2.uu.net!EU.net!Belgium.EU.net!ping.be!news
From: Geert Pirens <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Searching for: how to built a antenna rotator (rortor) KCT compatible ?
Date: 18 Dec 1995 02:12:48 GMT
Organization: PING Belgium
Lines: 13
Message-ID: <4b2in0$[e-mail]>
NNTP-Posting-Host: dialup05.hasselt.eunet.be
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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X-Mailer: Mozilla 1.22 (Windows; I; 16bit)
To: all

Hello All,

I am looking for some schematics or pcb's for to built my own computer
rs-232 to an KCT (kansas city tracker) compatible system.

Who can help me ?


Geert Pirens

ONL2057




From Unknown Thu Dec 21 20:34:05 1995
Path: news.epix.net!uunet!in2.uu.net!EU.net!Belgium.EU.net!ping.be!news
From: Geert Pirens <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Searching for: how to built a antenna rotator (rortor) KCT compatible ?
Date: 18 Dec 1995 02:13:05 GMT
Organization: PING Belgium
Lines: 13
Message-ID: <4b2inh$[e-mail]>
NNTP-Posting-Host: dialup05.hasselt.eunet.be
Mime-Version: 1.0
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X-Mailer: Mozilla 1.22 (Windows; I; 16bit)

Hello All,

I am looking for some schematics or pcb's for to built my own computer
rs-232 to an KCT (kansas city tracker) compatible system.

Who can help me ?


Geert Pirens

ONL2057




From Unknown Thu Dec 21 20:34:06 1995
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!usenet.hana.nm.kr!usenet.seri.re.kr!news.kreonet.re.kr!EU.net!newsfeed.internetmci.com!in2.uu.net!ayrton.eideti.com!ayrton.eideti.com!abbot
From: [e-mail] (Nicholas Abbot)
Newsgroups: de.comm.ham,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew,rec.radio.amateur.misc,sci.electronics
Subject: Re: Serial-to-Parallel Converter
Followup-To: de.comm.ham,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew,rec.radio.amateur.misc,sci.electronics
Date: 19 Dec 1995 13:40:46 GMT
Organization: InfiNET Access
Lines: 24
Distribution: world
Message-ID: <4b6fcu$[e-mail]>
References: <4a383p$a74$[e-mail]> <[e-mail]> <4an2cc$[e-mail]>
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Richard Evans ([e-mail]) wrote:
: In article <[e-mail]>, [e-mail] (Larry DeSoto) writes:
: |> In article <4a383p$a74$[e-mail]>, Brian Webb <10
[e-mail]> writes:
: |> > I'm trying to find either an IC or a schematic for converting
: |> > serial-parallel.
: |> >
: |> > I own a solid state radioteletype decoder (circa 1980) designed
: |> > to work with serial printers. However, my printer, like virtually
: |> > all others is parallel.
: |>
: |> You need a Universal Asynchronous Receiver Transmitter (UART).  One
: |> entirely satisfactory device I've used is a Giant AY-1013.  This is
: |> an old device and I don't know if they are still being manufactured.
: |> If you can get one, it is easy to use in that it requires minimal
: |> support (a clock and maybe a level converter for the serial line).

: The 6402 is also suitable. This may be pin compatible with the AY-1013,
: and is definitely still available. You can choose parity/stop bits etc
: by hard wiring various pins high or low, and it will run up to 100Kbps.
: This version needs a clock input, but there's also a 6403 which has a
: clock generator built-in so you can just add a Xtal.

        You could probaly pick-up a cheap serial printer
        for less aggravation and dollars.


From Unknown Thu Dec 21 20:34:08 1995
Path: news.epix.net!news.sprintlink.net!news.heurikon.com!uwvax!fullfeed!pendragon!ames!usenet.kornet.nm.kr!xpat.postech.ac.kr!mirror.postech.ac.kr!chroman
From: [e-mail] (Jo GyuChan (8924036))
Newsgroups: de.comm.ham,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew,rec.radio.amateur.misc,sci.electronics
Subject: Re: Serial-to-Parallel Converter
Date: 20 Dec 1995 01:12:43 GMT
Organization: POSTECH, Pohang, Korea
Lines: 20
Distribution: world
Message-ID: <4b7nub$[e-mail]>
References: <4b6fcu$[e-mail]>
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Nicholas Abbot ([e-mail]) wrote:
: Richard Evans ([e-mail]) wrote:
: : In article <[e-mail]>, [e-mail] (Larry DeSoto) writes
:
: : |> In article <4a383p$a74$[e-mail]>, Brian Webb <
[e-mail]> writes:
: : |> > I'm trying to find either an IC or a schematic for converting
: : |> > serial-parallel.
: : |> >
: : |> > I own a solid state radioteletype decoder (circa 1980) designed
: : |> > to work with serial printers. However, my printer, like virtually
: : |> > all others is parallel.

  You may be able to make a serial-to-parallel converter. But, I guess you
might have good solution after you go through your printer manual. It
probably has a serial interface option or already have one.

--
Dickson 2.4
"People even being as stupid as me should still survive,
 strive to learn, and attempt to contribute."
                - from somebody's signature


From Unknown Thu Dec 21 20:34:09 1995
Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!ddsw1!news.mcs.net!van-bc!news.cyberstore.ca!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!news.iadfw.net!usenet
From: [e-mail] (Kerry Miller)
Newsgroups: rec.radio.amateur.homebrew
Subject: Simple QRP projects
Date: Wed, 20 Dec 1995 01:44:40 GMT
Organization: Internet America
Lines: 42
Message-ID: <4b7pr5$[e-mail]>
NNTP-Posting-Host: dal04-11.ppp.iadfw.net
X-Newsreader: Forte Free Agent 1.0.82

Boy, I didn't know there was this much interest.  Ever since I opened
my mouth about a 40m transmitter built out of nand gates I've been
inundated by requests for schematics!  Sounds like we need to have a
qrp net...

I don't have the schematics in electronic form, but I do have a few
references to get you started looking them up.  After Christmas I'll
see what I can do about scanning them so I can e-mail them instead of
using snail-mail.

First, there are several schematics, albeit ascii drawings, at this
URL:
www.acs.ncsu.edu/HamRadio/HF/qrp/projects/

Here are a few fairly recent articles with simple projects:

August 1995 CQ, pg 71 - 250 mW tx with nand gate oscillator, a nand
buffer, 4 "nands" in the final (!) and a nand gate to key it.  Even
simpler than my tx which has 2 -  2n2222's in the final!

Nov. 1994 QST, pg. 84 - Single chip tx using a 74HC240, claims 1/2
watt, probably a bit optimistic.

An older article for a single transistor rx is in the Oct. 1986 73,
page 54.  I have several others, but I left them at work to copy them.
More to come when I find them.  The bad news is that I still haven't
located the original article I mentioned about the 40m and 80m
transmitters.  They were from 73 magazine, around 1990 or 1991.  The 2
rigs were called something like "Ether duster" and "Cloud Buster" or
something catchy like that.  If anyone is familiar with this article,
please post if for those who are interested.  Judging by the amount of
e-mail I've gotten, there must be more interest in QRP and simple
construction projects than I thought!

I'll post the other references later, and will try to get the
schematics scanned after Christmas.

73,
Kerry Miller
WD5ABC




From Unknown Thu Dec 21 20:34:10 1995
Path: news.epix.net!news.sprintlink.net!EU.net!peer-news.britain.eu.net!demon!mail2news.demon.co.uk!drspc.demon.co.uk
From: David Skinner <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Single-chip FX xmitters?
Date: Mon, 18 Dec 1995 22:17:54 GMT
Organization: Home
Lines: 19
Distribution: world
Message-ID: <[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: drspc.demon.co.uk
X-Broken-Date: Monday, Dec 18, 1995 22.17.54 GMT
X-Newsreader: Newswin Alpha 0.6
X-SMTP-Posting-Host: post.demon.co.uk [Mon, 18 Dec 95 22:20:19 GMT]

X-SMTP-Posting-Host: drspc.demon.co.uk [Mon, 18 Dec 95 22:18:25 GMT]

Can anyone help me??

Do any of the major semiconductor manufacturers make an off-the-shelf
IC which operates as a low power FX transmitter? You know, the sort
of thing one might use to build a cordless baby alarm or bugging
device.

Thanks in advance for any info!

--
David Skinner                       [e-mail]
PGP key available on request
===========================================================
  Reality.sys corrupted. Universe halted. Reboot(Y/N) ?
===========================================================



From Unknown Thu Dec 21 20:34:11 1995
Path: news.epix.net!news.sprintlink.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!EU.net!peer-news.britain.eu.net!demon!mail2news.demon.co.uk!drspc.demon.co.uk
From: David Skinner <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Single-chip FX xmitters?
Date: Wed, 20 Dec 1995 17:27:02 GMT
Organization: Home
Lines: 16
Distribution: world
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: drspc.demon.co.uk
X-Broken-Date: Wednesday, Dec 20, 1995 17.27.02 GMT
X-Newsreader: Newswin Alpha 0.6
X-Mail2News-Path: relay-4.mail.demon.net!post.demon.co.uk!drspc.demon.co.uk


Glad you picked up the typo - FX instead of FM!
I'll get onto Motorola's web site and get a data sheet for these chips.

Do you know of any modules that make it even easier - with just
battery, input signal, tuning pot & antenna connections?



David Skinner                       [e-mail]
PGP key available on request
===========================================================
  Reality.sys corrupted. Universe halted. Reboot(Y/N) ?
===========================================================



From Unknown Thu Dec 21 20:34:13 1995
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!math.ohio-state.edu!jussieu.fr!oleane!tank.news.pipex.net!pipex!demon!sdschool.demon.co.uk
From: [e-mail] (LAURIE)
Newsgroups: rec.radio.amateur.homebrew
Subject: tait t520 help
Date: Mon, 18 Dec 1995 04:03:34 GMT
Lines: 15
Message-ID: <[e-mail]>
NNTP-Posting-Host: sdschool.demon.co.uk
X-NNTP-Posting-Host: sdschool.demon.co.uk
X-Newsreader: Forte Free Agent 1.0.82

hi all
anybody done work with a tait t520 that uses a multi channel
swithching unit it comprises of 2 x bcd's feeding  the board where the
diode matrix board was
the 2 chips {14/16 devices forgot which} are missing hence i cant
dissasemble the chips for the programme
A:have you got any info on the chips
b:have you got any info on the programme that goes into these chips

i believe that they are ttl proms ie as used in the mx290 series etc
any help much app
73's de laurie    [e-mail]




From Unknown Thu Dec 21 20:34:14 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.dpc.net!novia!uunet!in2.uu.net!pmafire!net.ricks.edu!usenet
From: [e-mail] (James Griffith)
Subject: THANK'S TO ALL FOR 2N4416 SOURSES
Message-ID: <[e-mail]>
Sender: [e-mail] (usenet)
Organization: Ricks College
X-Newsreader: WinVN 0.93.11
Mime-Version: 1.0
Date: Tue, 19 Dec 1995 17:50:17 GMT
Lines: 6

I have really enjoyed this group. They have always been very helpful.
Thank you to all those who have given me a source for the 2N4416, and to
Pieter for those that are in the mail.
TNX Jim, WA7NDD
A Merry Christmas to all and happy hollidays.



From Unknown Thu Dec 21 20:34:15 1995
Path: news.epix.net!news.sprintlink.net!news.eznet.net!news.enterprise.net!btnet!newsfeed.internetmci.com!in1.uu.net!hearye.mlb.semi.harris.com!jabba.ess.harris.com!news.ess.harris.com!usenet
From: [e-mail] (kennedy)
Newsgroups: rec.radio.amateur.homebrew
Subject: Tower R.F. Choke info
Date: 19 Dec 1995 19:31:54 GMT
Organization: Your Organization
Lines: 6
Message-ID: <4b73va$[e-mail]>
NNTP-Posting-Host: mtde08.mtp.semi.harris.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Newsreader: WinVN 0.92.6

I have an rf choke in my possesion with a part # 7871
10A./.75mh TOWER R.F. Choke. I'd like a catalog from the company
but I cant locate them. They are not Tower Electronics, Tower
Manufacturing,or Tower equipment. Can someone help me out?
This thing is bulky, about 6" long and 4" high. 2"OD form.
Please post. Thanks


From Unknown Thu Dec 21 20:34:16 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!usenet
From: Carl Gregory <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Transmitting loop near miss
Date: 18 Dec 1995 23:26:26 GMT
Organization: Univ. of Illinois / Biomedical Magnetic Resonance Lab
Lines: 29
Message-ID: <4b4tb2$[e-mail]>
References: <4b496l$[e-mail]>
NNTP-Posting-Host: magnet.beckman.uiuc.edu
Mime-Version: 1.0
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To: [e-mail]
X-URL: news:4b496l$[e-mail]

Dave Curtis <[e-mail]> wrote:
>I get sharp SWR dips on all bands 80-20, so it does
>tune.  I just never see an SWR below about 4:1  Also, it
>seems to be more broadband that I would have suspected.
>As measured by an Autek RF-1, it shows Z of about 40 ohms,
>max, at the tuned frequency.  (I know, 40 ohms ain't 4:1 --
>haven't figured that one out.  Of course, nobody would
>confuse my instruments with an NBS secondary standard...)
>
>1) could coupling to near by metal be causing low Q and
>this much loss?  house and fence are stucco walls, so
>probably have masonary wire in them.  Roof also has
>copious amounts of metal flashing, etc under the tiles.

>3) the only connections where I am suspicious of resistive
>loss are to the VVC. Since I can't/won't weld to the VVC,
>the copper pipe is flattenned and bolted down to the VVC
>using plated screws, mating to plated surfaces, with
>liberal amounts of penetrox.  could this still be a source
>of loss?

YES!  And the loss would account for lower Q and failure to
match correctly, as mentioned above.   You should be able to
get the published Q values with proper construction and
installation.

73, K8CG




From Unknown Thu Dec 21 20:34:17 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!nntp.coast.net!col.hp.com!sdd.hp.com!hp-pcd!news1.boi.hp.com!news
From: dave eckhardt <[e-mail]>
Subject: Re: Transmitting loop near miss
Sender: [e-mail] (Boise Site News Server)
Message-ID: <[e-mail]>
Date: Thu, 21 Dec 1995 19:59:04 GMT
Content-Transfer-Encoding: 7bit
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References: <4b496l$[e-mail]>
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Organization: Hewlett-Packard / Boise, Idaho
Lines: 17

Just relate my experience on a 4-foot diameter 5/8" Cu tubing loop I
tried.  I am able to resonate it on 40, 30, and 20 with a 250 pF 5kV air
variable and loop feed.  When originally built, I connected the variable
C to the ends of the loop with the braid from a good grade of RG-8U.  I
was quite surprised to find this braid warmed enough at 100 watts that
the flux left from the soldering operation smoked!  I finally replaced
the braid with three paralleled lengths of #10 AWG Cu wire.  It only
barely warms to the touch after 10 minutes of CW transmitting.  Lots of
current in spite of the voltage!  Operating inside a stuccoed house on
the ground floor, it is about 10 dB lower than the outdoor center-fed
Zepp.  Not bad for a small antenna INSIDE the house amoungst filing
cabinets and metal shelving.

Dave Eckhardt  W6LEV
dave_eckhardt@HP-Greeley_om2.om.hp.com   (work)
[e-mail]   (home)



From Unknown Thu Dec 21 20:34:18 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!cheatum.frontiernet.net!Empire.Net!news.net99.net!news.fc.net!digdug.pencom.com!netcomsv!uu4news.netcom.com!netcomsv!uu3news.netcom.com!ix.netcom.com!howland.reston.ans.net!newsfeed.internetmci.com!delmarva.com!udel!rochester!rocksanne!news
From: [e-mail]
Subject: Transverter question
Content-Type: TEXT/PLAIN; charset=US-ASCII
Message-ID: <[e-mail]>
Lines: 6
Sender: [e-mail]
Organization: Xerox
X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage
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Date: Tue, 19 Dec 1995 15:16:50 GMT


Just purchased inexpensive module to allow Icom 730 HF rig to emit low level
RF signal for use with a transverter. Now am wondering where to go from here.
Are there inexpensive kits available that might get me 2m or 70cm SSB and CW?
Can anyone provide leads to a supplier? Anyone have any used offerings?
Regards,
Paul
KB2TCG



From Unknown Thu Dec 21 20:34:19 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsxfer.itd.umich.edu!chi-news.cic.net!news.compuserve.com!news.production.compuserve.com!news
From: Dave'Doc'Reid <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: uKeyer and uTutor on WWW
Date: 19 Dec 1995 04:40:59 GMT
Organization: D.R.Computer Products
Lines: 23
Message-ID: <4b5for$9r0$[e-mail]>

Hi - Just to let you all know

that details of the new D.R.Computer products Kits
are available on the WWW at

     http://ourworld.compuserve.com/homepages/DRCP

or - you can EMail me with info on the format you would
like a graphics file of the Kits - and I'll send you
an electronic version of the DataSheets

Cheers es 73 fer nw

DE Dave G0BZF (owner of D.R.C.P.)

EMail [e-mail] (or [e-mail])
Packet Radio G0BZF @ GB7DEO.#32.GBR.EU

--

Dave 'Doc'Reid Owner and proprieoter of D.R.Computer Products
Bringing radio amateurs everywhere into the digital age
Callsign G0BZF   GQRP # 3677   RSGB  (UK organiser of LY96BDX)


From Unknown Thu Dec 21 20:34:21 1995
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!howland.reston.ans.net!usc!NewsWatcher!user
From: [e-mail]
Newsgroups: soc.culture.venezuela,soc.culture.uruguay,soc.culture.spain,soc.culture.peru,soc.culture.mexican.american,soc.culture.latin-america,soc.culture.ecuador,soc.culture.cuba,soc.culture.colombia,soc.culture.chile,soc.culture.bolivia,soc.culture.argentina,rec.radio.amateur.policy,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.digital.misc,rec.radio.amateur.antenna
Subject: Re: Un francΘs estß buscando contacto
Date: Wed, 20 Dec 1995 14:10:39 -0800
Organization: University of Southern California, Los Angeles, CA
Lines: 33
Sender: [e-mail]
Message-ID: <estrella-2012951410390001@128.125.62.135>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: catalog10.usc.edu
Xref: news.epix.net soc.culture.venezuela:43405 soc.culture.uruguay:4704 soc.culture.spain:83932 soc.culture.peru:11097 soc.culture.mexican.american:7911 soc.culture.latin-america:39945 soc.culture.ecuador:4286 soc.culture.cuba:32001 soc.culture.colombia:12617 soc.culture.chile:32508 soc.culture.bolivia:10803 soc.culture.argentina:29112 rec.radio.amateur.policy:32273 rec.radio.amateur.misc:95840 rec.radio.amateur.homebrew:12265 rec.radio.amateur.equipment:22806 rec.radio.amateur.digital.misc:13254 rec.radio.amateur.antenna:17862

In article <[e-mail]>, Philippe CUVINOT
<[e-mail]> wrote:

> Hola,
>
> Soy francΘs y estoy buscando a amigos para conversar acerca de temas
> latino americanos. Me interesa muchφsimo la cultura precolombina y
> estoy realizando una pßgina a prop≤sito de las grandes civilizaciones.
> Escribanme para darme ideas interesantes. Gracias.
> Hasta pronto, Philippe.

Hola Philippe,

   Yo soy frances tambien, y vivo en Los Angeles, California. Trabajo como
bibliotecario especializado en literatura mexicana y centro americana, en
la University of Southern California. Me gustaria conversar contigo en
cualquier idioma (espanol, frances, ingles) y ayudarte. Aqui en el sur de
la California hay mucha gente de habla hispana y muchas organizaciones
culturales : mexicanas, salvadorenas, hondurenas......bueno una fuente muy
larga de posibilidades. Puedes usar mi correo electronico directamente

[e-mail]

espero hablar contigo muy pronto!  gracias

JEAN-LUC


JEAN-LUC ESTRELLA
DOHENY MEMORIAL LIBRARY
UNIVERSITY PARK CAMPUS
LOS ANGELES, CA, 90089
U.S.A.


From Unknown Thu Dec 21 20:34:22 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!uunet!in1.uu.net!iglou!news
From: [e-mail] (Chris Sakkas)
Subject: WEB and FTP Site update
X-Nntp-Posting-Host: dp2-062.ppp.iglou.com
Message-ID: <[e-mail]>
Sender: [e-mail] (News Administrator)
Organization: ITU Technologies
X-Newsreader: Forte Free Agent 1.0.82
Date: Sun, 17 Dec 1995 20:19:29 GMT
Lines: 25

Hello!

We've recently changed the URL to our ftp and web site.  The new URL's
are:

ftp://itutech.com               Anonymous FTP
http://www.itutech.com  World-Wide-Web site

Please update your links to reflect these changes.

Our ftp and web site features files on Electronics, Amateur Radio, PC
interfacing, PIC programming and other programs of interest to the
electronics/computer enthusiast.  Please feel free to upload your
contributions in the incoming directory.

Thanks!

Chris
----------------------------------------------------------------------
Chris B. Sakkas  ([e-mail])    http://www.itutech.com/
ITU Technologies ([e-mail])    ftp://itutech.com/
[phone]     VISA/MC Accepted
*** Complete PIC programming packages starting at only $29! ***
*** See our web page or e-mail us today for more info! ***



From Unknown Thu Dec 21 20:34:23 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!cheatum.frontiernet.net!Empire.Net!news.net99.net!news.fc.net!digdug.pencom.com!netcomsv!uu4news.netcom.com!netcomsv!uu3news.netcom.com!ix.netcom.com!howland.reston.ans.net!newsfeed.internetmci.com!delmarva.com!udel!rochester!rocksanne!news
From: [e-mail]
Subject: Where to find 2.5mm stereo phono plugs and jacks?
Content-Type: TEXT/PLAIN; charset=US-ASCII
Message-ID: <[e-mail]>
Lines: 9
Sender: [e-mail]
Organization: Xerox
X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage
Mime-Version: 1.0
Date: Tue, 19 Dec 1995 15:22:11 GMT


I have struck out finding 2.5mm stereo phono plugs and jacks.  You know the
kind; they're used as mic connectors in HTs.  Radio Shack doesn't have 'em.
Nor does AES or DigiKey.  Local industrial electronics suppliers don't have
'em either.  Anyone know of a source of these?  Or better yet, a source for
the combo plug used with Icom HTs which has one stereo 2.5 mm and one mono
mini phono plug adjacent for use with speaker mic.  Application is homebrew
voice "keyer" and also TNC interface.
Regards,
Paul
KB2TCG



From Unknown Thu Dec 21 20:34:24 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!freenet2.freenet.ufl.edu!afn01212
From: W4KZL SPARKS [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: wwvb rcvr
Date: 18 Dec 1995 23:16:00 GMT
Lines: 3
Message-ID: <4b4sng$[e-mail]>
NNTP-Posting-Host: freenet2.afn.org
Originator: [e-mail]

True, almost all stations use a frame store so even tho they are in 'sync'
with the net your frequency standard bits the dust



From Unknown Thu Dec 21 20:34:25 1995
Path: news.epix.net!news.sprintlink.net!nntp.coast.net!col.hp.com!jwc
From: [e-mail] (John Chapman)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WWVB Receiver?
Date: 18 Dec 1995 21:49:30 GMT
Organization: HP Colorado Springs Division
Lines: 21
Message-ID: <4b4nla$[e-mail]>
References: <495una$[e-mail]> <49j12i$[e-mail]>
NNTP-Posting-Host: mssjwc.col.hp.com
X-Newsreader: TIN [version 1.2 PL2]

: Have you considered using television network burst processed for an
: accurate source.  Any time your local t.v. station is broadcasting
: network feeds, their 3.57954545 signal is good out to upteen decimal
: places.  About 10 years ago I phase locked a crystal oscillator to the
: crystal of a small solid state color receiver on the bench. Divide by
: 88 and multiply by 63 and you've got 5.000000000 Mhz.  Turns out our
: local NBC affiliate kept the station locked to network black-burst
: even while they were originating locally . . . made for a rather
: simple way to get lots of zeros behind the integers . . .

: Regards,

:   Bob, K0DYH

  I believe you will find this not valid anymore. Since every local station
started using local syth'ized systems.

 We used to do this also but hat to stop and go back to WWVB.

John, N0KIC



From Unknown Thu Dec 21 20:34:26 1995
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!vixen.cso.uiuc.edu!sdd.hp.com!hplabs!unix.sri.com!news.Stanford.EDU!w6yx.stanford.edu!stevem
From: [e-mail] (Steve Muther)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WWVB Receiver?
Date: 18 Dec 1995 23:27:55 GMT
Organization: Stanford Amateur Radio Club
Lines: 38
Message-ID: <4b4tdr$[e-mail]>
References: <495una$[e-mail]> <49j12i$[e-mail]> <4b4nla$[e-mail]>
NNTP-Posting-Host: w6yx.stanford.edu

In article <4b4nla$[e-mail]> [e-mail] (John Chapman) writes
:
>: Have you considered using television network burst processed for an
>: accurate source.  Any time your local t.v. station is broadcasting
>: network feeds, their 3.57954545 signal is good out to upteen decimal
>: places.  About 10 years ago I phase locked a crystal oscillator to the
>: crystal of a small solid state color receiver on the bench. Divide by
>: 88 and multiply by 63 and you've got 5.000000000 Mhz.  Turns out our
>: local NBC affiliate kept the station locked to network black-burst
>: even while they were originating locally . . . made for a rather
>: simple way to get lots of zeros behind the integers . . .
>
>: Regards,
>
>:   Bob, K0DYH
>
>  I believe you will find this not valid anymore. Since every local station
>started using local syth'ized systems.
>
> We used to do this also but hat to stop and go back to WWVB.
>
>John, N0KIC
>

Just to confirm this, I have used a vectorscope and video waveform
monitor to compare sync and color timing of network feeds via satellite
to the same feed retransmitted by local affiliates (San Francisco) and
have noticed that they are NOT phase stable with respect to each other.

Getting a satellite receiver and using the direct network feed might be
one idea.  Short term stability would be good, long term stability will
be subject to daily satellite dirft in space.  You can get very good
NBC reception from the Satcom K2 satellite with a 4ft. dish.  It would
be interesting to compare its burst with a real standard.

Steve Muther, WF6R
[e-mail]




From Unknown Wed Dec 27 18:27:50 1995
Path: news.epix.net!uunet!in1.uu.net!tcsi.tcs.com!agate!dog.ee.lbl.gov!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Lawrence Stoskopf)
Newsgroups: rec.radio.amateur.homebrew
Subject: 100 W 7 MHz amp
Date: 24 Dec 95 21:01:57 GMT
Organization: ucsd usenet gateway
Lines: 66
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]


>
>Date: Thu, 21 Dec 1995 15:52:58 -0800
>From: Clifford Buttschardt <[e-mail]>
>Subject: 100 W 7 MHz amp
>
>Lawrence....Let me put a flag of warning up before you go too far off
>base with the special MOSFET amp in RF Design.  Those FET's are so highly
>"tweeked" for the 13 MHz frequency that they might not work on 160
>meters.  You might get them on 20 meters without too much trouble..W6HDO
>
>On 15 Dec 1995, Lawrence Stoskopf wrote:
>
>> For this range of power and frequency, a look at an article in May 1995 RF
>> Design is in order.  They have described in an article "High-Efficiency
>> Power Amplifiers for 13.56 ISM and HF Communications", a two (plastic)
>> MOSFET amp that puts out 400 W CW with 5 watts in using a 100 V power
>> supply.  Am thinking about building one for 160 for use when I don't want t
o
>> turn on the big amp.

That is always a worry when using a device not specified for a certain
service such as VHF pwr fets for low-noise 6 and 2 M preamps, using
internally matched devices for frequencies well away from the design frequency
.

The May 95 RF Design article I referred to also has a class D amp with a
complex front end getting 250 w output from 10 mw input rated from 1.8 to
13.56 MHz.  Of course this is not class C.

Richardson sent along a data sheet with detailed specs at 13.56 including an
amp using four devices putting 1000 watts out at 20 watts drive.  The 1 MHz
capacitances are Ciss 1500 pf, Coss 90 pf at Vdd 300v.  Nothing here
exciting except the big cap at the gates.

Thanks for the caveat, but have already received four of the devices (at $64
ea!, still less than replacements for the Dentron MLA-2500..which I've never
lost).  Am in the process of adding copper heat spreaders to a foot long
piece of 3456 waveguide which will serve as a water cooled heat sink....have
left room for another set of devices if all goes well with this model.  Also
am going to do away with all of that ferrite stuff and put a regular tube
type tank on the output. Since I have plenty of drive from the home-brew tx,
will do some passive drive to the gates with some attenuation to help the
driver (one of the Communications Concepts Motorola 140 w amps that has been
in service for 20 years and that someone has already suggested to the
starter of this thread...works well).

A first look a the pwr supply indicates that I'll need about 6000 ufd in the
filter and a good, low R-on bridge with a gradual charge circuit for
turn-on.  From Allied, can get the C for about $100 so should have less than
$500 in the amp if it works.

Of course, the question is why?  The amp will be in a shed about 300 ft from
the shack at the base of a vertical.  I have other amps, but only work VHF
and 160 CW so why put something more complex out there?

Will let you know what happens.  Suprisingly, my worries are not of wasting
money and time, but of the electrolytics.  I heard in a round-about manner
of a major company having one fail in a tight box, blowing the lid off,
breaking an arm, and with the lid ending up stuck in a wall several offices
away.  I was present when a 40 mfd cap @ 4500 v blew opening up a rack and
it easily awoke a bunch of tired contesters.  This amp will have about 10
times that much energy stored.

73
Lawrence E. Stoskopf
N0UU



From Unknown Wed Dec 27 18:27:51 1995
Path: news.epix.net!news.sprintlink.net!uunet!in2.uu.net!newshost.marcam.com!usc!chi-news.cic.net!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!galaxy.ucr.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 3 Phase
Date: 22 Dec 95 14:31:36 GMT
Organization: ucsd usenet gateway
Lines: 17
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Oops!  Stupid me.

I should read the "byline" before replying.  I keep forgetting this is
an international venue.

All of my responses were applicable only in the USA.  It turns out
that power distribution is one of the MOST nationalistic areas still
left in the world other than telecom.  Hopefully, someone in the UK
can give you an appropriate local answer.

Most of my ideas probably still hold.  The cheapest approach is still
to just change the motor with a single phase motor.

Ray Mack
WD5IFS
[e-mail]



From Unknown Wed Dec 27 18:27:52 1995
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.msfc.nasa.gov!elroy.jpl.nasa.gov!usc!howland.reston.ans.net!agate!library.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Komljanec, Tony)
Newsgroups: rec.radio.amateur.homebrew
Subject: 3 phase mains supply
Date: 22 Dec 95 17:09:00 GMT
Organization: ucsd usenet gateway
Lines: 35
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]


The European philosophy in using 3 phase is very different than North
America.  Many European countries offer 3 phase mains supply to households
(especially farms) as a matter of course.

In North America, many non-industrial areas (residential and rural) only
have single phase available.  Why?  Because the whole street is fed on the
primary side with only one phase.  Loads are balanced by alternating the
streets and their respective phase.  It would not be possible to obtain 3
phase power on such a street.

Now the big disadvantage, even if 3 phase is available:  More expensive
metering!  Single phase customers under 50 kVA pay only for real power, as
measured by a kW/Hr meter.  Three phase customers also pay for "demand",
that is, a penalty based on their highest load for the month.  The biggest
users also pay for power factor, either 90% of kVAR or kW/HR, which ever is
greater.  The minimum billed for a month is also higher for 3 phase
customers.

While in Europe, finding a single phase motor larger than 1 HP is unusual,
in North America, single phase motors to 7 HP can be obtained.  These motors
are usually much more expensive and larger than their 3 phase cousins, and
require some capacitive power factor correction, due to their poor power
factor.  While PF is not charged at the meter, the lines supplying such a
large motor will suffer much loss, if the current and PF are not improved.

Despite the initial high cost of a single phase motor, the more economical
solution in North America for operation of a small lathe or table saw, is to
go down to the motor rewinding shop, buy a single phase motor and convert
the device it drives.

Cheers!

Tony K,  VA3TK



From Unknown Wed Dec 27 18:27:53 1995
Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 3 Phase power
Date: 22 Dec 95 14:22:31 GMT
Organization: ucsd usenet gateway
Lines: 35
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Hi:
        The answer to your question is "You can do it.  For a price."
I'm not sure the power company can be compelled to do anything they
don't want to do, but dangle enough money in front of them and they
will oblige.

        The problem is 2 fold.  Some residential areas don't have all
three phases distributed.  If your poles have three wires going
across, then there is three phase available.  If the three phases are
available, they will probably only charge for the 2 extra transformers
(several kilobucks here) and for the power lines run to the house.
Then, of course, you have to have the house wired according to the NEC
and local codes.  The local codes are probably more of a stumbling
block than anything.

        I sincerely doubt that you have 3 phase to your residence,
unless someone went to a lot of trouble.  Just having electric heat
does not indicate a need for 3 phase.  What you probably have is 3
wires from the transformer.  This is called sometimes 2 phase.  What
it is really is a 240 volt center tapped single phase.  Each 120V side
is 180 degrees out of phase with the other side of Neutral.  You can
pull an incredible number of amps from a single phase 240V drop
depending on the transformer.

        The cheapest thing for your buddy to do is to buy a new motor
for $200 to $300 and convert his lathe to a single phase 240V
connection.  Of course, if he REALLY wants 3 phase, I will design and
build him a converter for about $1000.00 depending on load current!
They aren't that hard to do if you are driving a motor.

Ray Mack
WD5IFS
[e-mail]
for 12/23 to 1/1 use: [e-mail]



From Unknown Wed Dec 27 18:27:55 1995
Path: news.epix.net!news.sprintlink.net!twizzler.callamer.com!biggulp.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 3 Phase power
Date: Fri, 22 Dec 1995 17:29:46 -0800
Organization: Call America Internet Services  [phone]
Lines: 48
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: biggulp.callamer.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <[e-mail]>

Lets not forget the old old trick of making a rotary transformer by
exciting one phase of a three phase motor with a flywheel attached!  If
you can find an old three phase motor inexpensively of about the same
rating as the one in the lathe, then one simply applies single phase
power, kick start the flywheeled "transformer" and apply the three
phase connection to the lathe motor.  Do pay attention to the current
rating of both when you do this.  You can start and stop the lathe
without turning off the "transformer" as well!  Cliff Buttschardt W6HDO

On 22 Dec 1995 [e-mail] wrote:

> Hi:
>         The answer to your question is "You can do it.  For a price."
> I'm not sure the power company can be compelled to do anything they
> don't want to do, but dangle enough money in front of them and they
> will oblige.
>
>         The problem is 2 fold.  Some residential areas don't have all
> three phases distributed.  If your poles have three wires going
> across, then there is three phase available.  If the three phases are
> available, they will probably only charge for the 2 extra transformers
> (several kilobucks here) and for the power lines run to the house.
> Then, of course, you have to have the house wired according to the NEC
> and local codes.  The local codes are probably more of a stumbling
> block than anything.
>
>         I sincerely doubt that you have 3 phase to your residence,
> unless someone went to a lot of trouble.  Just having electric heat
> does not indicate a need for 3 phase.  What you probably have is 3
> wires from the transformer.  This is called sometimes 2 phase.  What
> it is really is a 240 volt center tapped single phase.  Each 120V side
> is 180 degrees out of phase with the other side of Neutral.  You can
> pull an incredible number of amps from a single phase 240V drop
> depending on the transformer.
>
>         The cheapest thing for your buddy to do is to buy a new motor
> for $200 to $300 and convert his lathe to a single phase 240V
> connection.  Of course, if he REALLY wants 3 phase, I will design and
> build him a converter for about $1000.00 depending on load current!
> They aren't that hard to do if you are driving a motor.
>
> Ray Mack
> WD5IFS
> [e-mail]
> for 12/23 to 1/1 use: [e-mail]
>
>
>


From Unknown Wed Dec 27 18:27:56 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!tank.news.pipex.net!pipex!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna
Subject: Re: 90 ohm cable on 300 ohm antenna
Date: Fri, 22 Dec 95 22:32:56 GMT
Lines: 14
Message-ID: <[e-mail]>
References: <4beib0$[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4
Xref: news.epix.net rec.radio.amateur.homebrew:12344 rec.radio.amateur.antenna:17955

   [e-mail] (Loren Coe) wrote:

>i am experimenting with connecting a 90ohm coax directly to a 300ohm
>fm antenna.

I would use a 300 ohm to 75 ohm transformer at the center of the
antenna (the type sold for use with 300 ohm TV antennas at Radio
Shack).  They cost less than $3.00 and the mismatch between the
90 ohm coax and the 75 ohm input to the transformer will be
insignificant in terms of receive efficiency.

73,
Jack  WB3U


From Unknown Wed Dec 27 18:27:57 1995
Path: news.epix.net!uunet!in1.uu.net!nntp.crl.com!crl2.crl.com!not-for-mail
From: [e-mail] (Donald J. Miller)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna
Subject: Re: 90 ohm cable on 300 ohm antenna
Followup-To: rec.radio.amateur.homebrew,rec.radio.amateur.antenna
Date: 23 Dec 1995 05:44:57 -0800
Organization: CRL Dialup Internet Access        [phone]  [Login: guest]
Lines: 13
Message-ID: <4bh14p$[e-mail]>
References: <4beib0$[e-mail]>
NNTP-Posting-Host: crl2.crl.com
X-Newsreader: TIN [version 1.2 PL2]
Xref: news.epix.net rec.radio.amateur.homebrew:12349 rec.radio.amateur.antenna:17960

Loren Coe ([e-mail]) wrote:
: matching xfmr.  my application is receiving stock quotes on SSB in an

SSB?  Surely you mean SCA...




--
-------------------------------------------------
Don Miller
[e-mail]
-------------------------------------------------


From Unknown Wed Dec 27 18:27:58 1995
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.msfc.nasa.gov!elroy.jpl.nasa.gov!usc!chi-news.cic.net!nntp.coast.net!zombie.ncsc.mil!cs.umd.edu!coopnews.coop.net!news.den.mmc.com!news.vf.mmc.com!ew0203!hbrown
From: [e-mail] (Harry H. Brown)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ? Design GS35B/3CX1500 for 2m and 70cm
Date: 22 Dec 1995 17:46:10 GMT
Organization: Sun Microsystems
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Distribution: world
Message-ID: <4beqt2$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ew0203.resd.vf.ge.com

Guenter,

I know that I say an article on using a 3CX1500 (8877) on 432 MHz. It likely w
as in ham radio magazine in the 70's. It's a little out of the specified frequ
ency range for the tube but it worked.

I'll look for it over the hollidays.

73, Harry, W3IIT



From Unknown Wed Dec 27 18:27:59 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Koellner, Guenter)
Newsgroups: rec.radio.amateur.homebrew
Subject: ? Design GS35B/3CX1500 for 2m and 70cm
Date: 22 Dec 95 19:15:00 GMT
Organization: ucsd usenet gateway
Lines: 22
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]


Hello OMs,

recently I got some russian tubes GS35B (triode, Ua=3000V, Pa=1500W,
fmax=1000MHz). It is large and heavy (2.8kg). Its datas seem to be
comparable to the 3CX1500/8877 exept the maximum operating frequency.

Now I am looking for a design of an amp for it. I already have some suitable
designs for 2m (K1AGB in QST 12/73, N7ART in QST 12/94 and OZ9ZI private
copy). But as far as I know the 3CX1500 is not working on 70cm I never saw
any design. Do you know a design? Maybe also another for 2m?

Also, I specially look for the articles references by N7ART: W.Orr, Editor,
Radio Handbook, 23rd ed. (Indianapolis: Howard W. Sams and Co., 1987), pp
18-2 to 18-7 and pp 18-11 to 18-15. Anyone who could send me a copy?

Thanks a lot in advance and Merry Christmas and a Happy New Year!

vy 73, Guenter, DL4MEA@DB0KCP.#BAY.DEU.EU   (AX.25)
                [e-mail]            (Internet)
                HTTP://WWW.SCN.DE/~KOELLNER (WWW)
                UO-22, KO-23 & KO-25        (Pacsats)


From Unknown Wed Dec 27 18:28:00 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!news.iadfw.net!usenet
From: [e-mail] (Kerry Miller)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ? Design GS35B/3CX1500 for 2m and 70cm
Date: Fri, 22 Dec 1995 16:03:38 GMT
Organization: customer of Internet America
Lines: 18
Message-ID: <4bektv$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: dal16-12.ppp.iadfw.net
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Koellner, Guenter) wrote:

> But as far as I know the 3CX1500 is not working on 70cm I never saw
>any design. Do you know a design? Maybe also another for 2m?
>vy 73, Guenter, DL4MEA@DB0KCP.#BAY.DEU.EU   (AX.25)
>                [e-mail]            (Internet)
>                HTTP://WWW.SCN.DE/~KOELLNER (WWW)
>                UO-22, KO-23 & KO-25        (Pacsats)

Guenter,
     I am pretty sure one of the last ARRL handbooks has a schematic
for an 8877 2m amp, but I don't remember seeing one for 70cm.  If you
don't find one, I'll look it up for you.
73 es Merry Christmas,
Kerry Miller
[e-mail]




From Unknown Wed Dec 27 18:28:01 1995
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usenet
From: Wes Stewart <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ? Design GS35B/3CX1500 for 2m and 70cm
Date: 23 Dec 1995 00:22:00 GMT
Organization: Arizona Daily Star - AZSTARNET
Lines: 35
Message-ID: <4bfi38$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: usr8ip47.azstarnet.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)
To: [e-mail]

[e-mail] (Koellner, Guenter) wrote:
>
>Hello OMs,
>
>recently I got some russian tubes GS35B (triode, Ua=3000V, Pa=1500W,
>fmax=1000MHz). It is large and heavy (2.8kg). Its datas seem to be
>comparable to the 3CX1500/8877 exept the maximum operating frequency.
>
>Now I am looking for a design of an amp for it. I already have some suitable
>designs for 2m (K1AGB in QST 12/73, N7ART in QST 12/94 and OZ9ZI private
>copy). But as far as I know the 3CX1500 is not working on 70cm I never saw
>any design. Do you know a design? Maybe also another for 2m?

The max freq rating for the 8877 is 250 MHz, so this probably explains the
lack of articles for 432. The 8938 is essentially the same tube with
a coaxial base and is rated to 500 MHz. I believe there is a published
design using the 8938 on 432, but I don't have it at hand.
>
>Also, I specially look for the articles references by N7ART: W.Orr, Editor,
>Radio Handbook, 23rd ed. (Indianapolis: Howard W. Sams and Co., 1987), pp
>18-2 to 18-7 and pp 18-11 to 18-15. Anyone who could send me a copy?

I don't have this edition, but perhaps it is the same as in the 22nd edition.
If this is the case, the design was first published in "ham radio magazine",
August 1971 and reprinted as an EIMAC note AS-47. I am using this amp on
two meters and it performs flawlessly. I highly recommend it. If this sounds
interesting, email your address and I will forward a copy.
>
>Thanks a lot in advance and Merry Christmas and a Happy New Year!

73 and happy holidays,

Wes -- N7WS




From Unknown Wed Dec 27 18:28:02 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!uwm.edu!homer.alpha.net!mashea
From: [e-mail] (Kevin Shea)
Newsgroups: rec.radio.amateur.homebrew
Subject: ?? Need spec sheets or source for a BB 505 (Varicap diode) ??
Date: Sat, 23 Dec 95 12:58:32 GMT
Organization: Alpha.net -- Milwaukee, WI
Lines: 27
Message-ID: <4bguf5$[e-mail]>
NNTP-Posting-Host: 205.213.64.120
X-Newsreader: News Xpress Version 1.0 Beta #4

Hi!

A couple of Italian Hams have designed a PC board for reception of HRPT
weather satellite data.  I bought the board from them but I have to buy all
the components.  The one I can't find anywhere is this variable cap diode BB
505.

I've looked all over and have had some friends check around, none can find a
cross reference.  My hope is that someone here might be able to find the cross

reference or a source.

As to my Italian Ham friends, they're off on vacation for a couple more weeks
and are not available, I hope to have this prototype built and running before
I have to return to work after the Holidays.

Thanks in advance and Happy Holidays!

73,

Kevin

****************************************
* Kevin G. Shea  N9JKP                 *
* 4460 Dahmen Pass                     *
* Cross Plains, WI 53528 USA           *
* 608.789.4326,voice; 608.798.1747,fax *
****************************************


From Unknown Wed Dec 27 18:28:03 1995
Path: news.epix.net!uunet!in2.uu.net!tcsi.tcs.com!agate!sunsite.doc.ic.ac.uk!demon!mail2news.demon.co.uk!lfheller.demon.co.uk
From: Leon Heller <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ?? Need spec sheets or source for a BB 505 (Varicap diode) ??
Date: Sat, 23 Dec 95 14:47:57 GMT
Organization: Home
Lines: 21
Message-ID: <[e-mail]>
References: <4bguf5$[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: lfheller.demon.co.uk
X-Newsreader: Demon Internet Simple News v1.29
X-Mail2News-Path: relay-4.mail.demon.net!post.demon.co.uk!lfheller.demon.co.uk

In article <4bguf5$[e-mail]> [e-mail] "Kevin Shea" writes
:

> A couple of Italian Hams have designed a PC board for reception of HRPT
> weather satellite data.  I bought the board from them but I have to buy all
> the components.  The one I can't find anywhere is this variable cap diode BB

> 505.
>
> I've looked all over and have had some friends check around, none can find a

> cross reference.  My hope is that someone here might be able to find the cro
ss
> reference or a source.

I've found several BBxxx devices in a couple of catalogues, including a
BB405, but not the 505. They are made by Philips, apparently, which
might help.

Leon
--
Leon Heller, G1HSM                | "Do not adjust your mind, there is
E-mail [e-mail]  |  a fault in reality": on a wall
Phone: [phone]         |  many years ago in Oxford.


From Unknown Wed Dec 27 18:28:04 1995
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!frankensun.altair.com!nntp.coast.net!zombie.ncsc.mil!news.duke.edu!agate!sunsite.doc.ic.ac.uk!demon!hamlab.demon.co.uk
From: [e-mail] (Steve Drury)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ?? Need spec sheets or source for a BB 505 (Varicap diode) ??
Date: Sat, 23 Dec 1995 22:53:43 GMT
Lines: 31
Message-ID: <[e-mail]>
References: <4bguf5$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: hamlab.demon.co.uk
X-NNTP-Posting-Host: hamlab.demon.co.uk
X-Newsreader: Forte Free Agent v0.46

[e-mail] (Kevin Shea) wrote:

>Hi!

>A couple of Italian Hams have designed a PC board for reception of HRPT
>weather satellite data.  I bought the board from them but I have to buy all
>the components.  The one I can't find anywhere is this variable cap diode BB
>505.

>I've looked all over and have had some friends check around, none can find a
>cross reference.  My hope is that someone here might be able to find the cros
s
>reference or a source.

>As to my Italian Ham friends, they're off on vacation for a couple more weeks

>and are not available, I hope to have this prototype built and running before

>I have to return to work after the Holidays.

>Thanks in advance and Happy Holidays!

>73,

>Kevin

Hi, they are available in the U.K. from BONEX ( tel. [phone] fax
01753 543812) at a price of ú0.25 each! The spec. I have says PIV of 25v
and capacitace 2.5pf, but doesnt specify at what voltage. I use them to
modulate a VHF VCO. Hope thats some use.
From Steve Drury.     Email [e-mail]
G6ALU MILTON KEYNES ENGLAND



From Unknown Wed Dec 27 18:28:06 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (SteveBragg)
Newsgroups: rec.radio.amateur.homebrew
Subject: Amateur-band distance measurement (radar, etc.)
Date: 27 Dec 1995 02:30:05 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 53
Sender: [e-mail]
Message-ID: <4bqslt$[e-mail]>
Reply-To: [e-mail] (SteveBragg)
NNTP-Posting-Host: newsbf02.mail.aol.com

I am a radio amateur experimenting with distance/velocity/acceleration
measurement using a digital-code transit-time method.  I have had some
limited success, using a direct-FSK system with 223 MHz uplink and
1300 MHz downlink.  If you're interested, the SPECS are below.   If not,
see the
PLEA below.

SPECS:
ANTENNAS:  6-el YAGI for the 223 Mhz uplink, and a 23-turn HELICAL
for the 1300 MHz downlink. 1/4 wave vertical on transponder downlink, loop
antenna on uplink.
GROUND RX:  .95 dB noise figure.  Downconvert to 28 MHz; use FM receiver
(Ramsey) to decode FSK.
MEAS SCHEME:  Used a simple PN code to lock the air-to-ground loop, and
measure the 2-way transit time.  A microcontroller averages and filters
the distance data, and differentiates it to get velocity and acceleration.

TRANSPONDER:  Linear transverter; does not demodulate data, only
preselects,
amplifies, filters, and upconverts to 1300 MHz.  Transponder output @ 1300
Mhz:  17 dBm.    Sensitivity @223 MHz for 20 dB quieting:  0.2 uV.
Tap-off for
command receiver (remote control) @ 10.7 MHz IF.
USE/RANGE:  Tracking amateur rockets.  Range:  50,000+ ft.  Up to Mach 2.
SHORTCOMINGS:  Fading.  Loss of loop lock on air/gnd loop.  Acquisition.
Too little power on downlink path.  No auto-tracking ability.  Measures in
one
axis only (RX ant axis).

PLEA:
I am interested in hearing from EXPERIENCED
experimenters doing measurement work with HAM-BAND equipment.
Specifically, I would like to know:

1.   What was the range of your system ?
2.   What object were you tracking (rocket, ballon, plane, glider, etc.)
3.  What was your modulation method ?
4.  What characteristic of the signal did you use for measurement (transit
time, Doppler, etc.) ?
5.  What bands did you use ?
6.  What power levels and antennas ?
7.  Did you use a transponder, or a reflective/passive system ?
8.  Does your system track the source?  How (monopulse, conical scan,
etc.) ?

... and anything else you think I should know.  E-Mail me if you want more
details about my system.  I think hams should share successes (and
failures!)

73,
Steve Bragg KA9MVA
Stillwater, Oklahoma
[e-mail]


From Unknown Wed Dec 27 18:28:07 1995
Path: news.epix.net!news.sprintlink.net!nuclear.microserve.net!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Any idea's for building a good antenna for my home stereo
Date: Thu, 21 Dec 95 20:42:41 GMT
Organization: Microserve Information Systems (800)-380-INET
Lines: 13
Distribution: world
Message-ID: <4bdrh5$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

   chad@mail wrote:

>Does anyone have any good idea's on how to build a good antenna for a
>home stero?

Radio Shack sells an omnidirectional antenna for $14.99 that works
very well (I have one in my attic).  It's part no. 15-2164, and it
consists of two folded dipoles mounted at right angles to each other.

At that price, I think you'd be hard pressed to build anything as good
for general use.

Jack  WB3U


From Unknown Wed Dec 27 18:28:08 1995
Path: news.epix.net!news.sprintlink.net!nuclear.microserve.net!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Any idea's for building a good antenna for my home stereo
Date: Thu, 21 Dec 95 20:45:54 GMT
Organization: Microserve Information Systems (800)-380-INET
Lines: 13
Distribution: world
Message-ID: <4bdrn6$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

   chad@mail wrote:

>Does anyone have any good idea's on how to build a good antenna for a
>home stero?

Radio Shack sells an omnidirectional antenna for $14.99 that works
very well (I have one in my attic).  It's part no. 15-2164, and it
consists of two folded dipoles mounted at right angles to each other.

At that price, I think you'd be hard pressed to build anything as good
for general use.

Jack  WB3U


From Unknown Wed Dec 27 18:28:09 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!elroy.jpl.nasa.gov!usc!chi-news.cic.net!nntp.coast.net!col.hp.com!sdd.hp.com!night.primate.wisc.edu!kbad.eglin.af.mil!rpi!randy
From: [e-mail] (Randall Bradley)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Any idea's for building a good antenna for my home stereo
Date: 22 Dec 1995 15:17:37 GMT
Organization: Rensselaer Polytechnic Institute, Troy NY, USA
Lines: 9
Message-ID: <4bei6h$[e-mail]>
References: <[e-mail]> <4bdrn6$[e-mail]>
NNTP-Posting-Host: pulsar2.rdrc.rpi.edu


the best antenna for FM use is your LOG PERIODIC TV antenna! It has
high gain, narrow beamwidth, and works like a champ.

Of course if you wanted an INDOOR antenna, that's another
discussion.

                        -_-_randy-_-
                        WB2GCR  (among other things)


From Unknown Wed Dec 27 18:28:10 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!pacifier!rainrgnews0!hevanet.com!usenet
From: "Michael G. Reiney" <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Atlas 210X power output Question
Date: 27 Dec 1995 22:48:51 GMT
Organization: Hevanet Communications
Lines: 16
Message-ID: <4bsigj$[e-mail]>
NNTP-Posting-Host: br-ppp00.hevanet.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)
Xref: news.epix.net rec.radio.amateur.equipment:23129 rec.radio.amateur.homebrew:12400

I have an Atlas 210X that works fine on 40 meters and up.  On 75 meters, I can
 only
get about 40W out of it.
I hypothesize that if the high freq power out is ok, the transistors are good.
The 80M filters are not tunable, so they've probably not been tweeked.
Ideas?

The only thing I can think of is that one of the broadband transformers in the
 final
have a cracked core and insufficient inductance to get to 80M.  They look ok.
 I
don't have any idea how to check it out without disassembling the transformer
and
checking each core.  High risk of breaking something.

Any guidance would be appreciated.  I do have access to equipment, GHz scope,
spectrum analyzer etc.  Don't be shy with wild test ideas.

thanks, miker



From Unknown Wed Dec 27 18:28:11 1995
Path: news.epix.net!news.sprintlink.net!escc.es.com!news
From: [e-mail] (Max Kelson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Crystal Filters for Ham in Ukraine
Date: 26 Dec 1995 13:46:22 -0700
Organization: Evans & Sutherland Computer Corp, SLC, Utah
Lines: 17
Message-ID: <4bpmuu$[e-mail]>
NNTP-Posting-Host: chekov.sim.es.com



I have a friend in the Ukraine (uu0jn) who has a homemade HF
transceiver who is having a problem finding crystal filters.
Can someone tell me where I can find these?

I would be interested in buying new or used or in alternative
methods of solving the problem.  Also, any references for
making a "home brew" filter might be very helpful.

Thanks in advance.

Max Kelson
email:  [e-mail]

--
Email:  [e-mail]


From Unknown Wed Dec 27 18:28:12 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail](Wanda M Desmond )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Crystal Filters for Ham in Ukraine
Date: 27 Dec 1995 08:28:23 GMT
Organization: Netcom
Lines: 25
Message-ID: <4br037$[e-mail]>
References: <4bpmuu$[e-mail]>
NNTP-Posting-Host: bak-ca1-25.ix.netcom.com
X-NETCOM-Date: Wed Dec 27 12:28:23 AM PST 1995

In <4bpmuu$[e-mail]> [e-mail] (Max
Kelson) writes:
>
>
>
>I have a friend in the Ukraine (uu0jn) who has a homemade HF
>transceiver who is having a problem finding crystal filters.
>Can someone tell me where I can find these?
>
>I would be interested in buying new or used or in alternative
>methods of solving the problem.  Also, any references for
>making a "home brew" filter might be very helpful.
>
>Thanks in advance.
>
>Max Kelson
>email:  [e-mail]
>
>--
>Email:  [e-mail]

The '95 and '96 ARRL Handbooks have schematics for crystal filters.

John
KE6TGN


From Unknown Wed Dec 27 18:28:12 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!newsrelay.iastate.edu!news.iastate.edu!sdg.cc.iastate.edu!graphix
From: [e-mail] (Kent A Vander Velden)
Newsgroups: rec.radio.amateur.homebrew
Subject: Crystal sets
Date: 27 Dec 95 08:37:57 GMT
Organization: Iowa State University, Ames, Iowa
Lines: 14
Message-ID: <[e-mail]>
NNTP-Posting-Host: sdg.cc.iastate.edu

  For some reason crystal sets have fascinated me since I was a kid.
Could someone give me some references as to where to get some good
information on the subject?  I am very interested in the design of the
set and details as to why certain components where used and placed.

  Thanks for any input.

  P.S. Please email me response as well to insure that I see your input.


--
Kent Vander Velden
[e-mail]



From Unknown Wed Dec 27 18:28:14 1995
Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!aimnet.com!netserv.com!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news
From: Zack Lau <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DC Rcvr w/DSP backend
Date: Fri, 22 Dec 1995 09:21:20 -0800
Organization: American Radio Relay League
Lines: 24
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: mgate.arrl.org
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b3 (Win16; I)
To: Rocci <[e-mail]>

WA3CMQ Rocci wrote:

> Traditional phasing DC receivers are limited to about 40
>dB of sideband rejection because it
> is very difficult in hardware to obtain the amplitude
>and phase balance (reformatted for clarity)

I've measured as much as 50 dB with an analog design.  Don't know
how much it will drift over the next decade, though. I think phasing
can work much better than the filter method for a CW only receiver.

1) No problem with low pitched CW.  With the filter method your
        opposite sideband supression degrades as you lower the
        pitch.
2) You can create a deep opposite sideband null at your
        favorite pitch. Much harder to accomplish with
        the filter technique.

DSP designsers should not assume that the mixers are matched,
particularly ones using little ferrite cores.  Two mixers on
the same piece of silicon ought to do a lot better, but I don't
know of any high dynamic range ones available to amateurs.

Zack KH6CP/1


From Unknown Wed Dec 27 18:28:15 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!agate!msunews!netnews.upenn.edu!netaxs.com!usenet
From: Rocci <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DC Rcvr w/DSP backend
Date: Fri, 22 Dec 1995 22:39:43 -0800
Organization: Net Access - Philadelphia's Internet Connection
Lines: 33
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: slip-748.netaxs.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b2a (Windows; I; 16bit)

Zack Lau wrote:
>
> I've measured as much as 50 dB with an analog design.  Don't know
> how much it will drift over the next decade, though. I think phasing
> can work much better than the filter method for a CW only receiver.
>
> 1) No problem with low pitched CW.  With the filter method your
>         opposite sideband supression degrades as you lower the
>         pitch.
> 2) You can create a deep opposite sideband null at your
>         favorite pitch. Much harder to accomplish with
>         the filter technique.
>
> DSP designsers should not assume that the mixers are matched,
> particularly ones using little ferrite cores.  Two mixers on
> the same piece of silicon ought to do a lot better, but I don't
> know of any high dynamic range ones available to amateurs.

The DSP approach I'm thinking about would use hardware for the mixers,
post mixer lowpass filters (needed to keep out of band sigs from
overloading the DSP), and pre-DSP audio amplifiers. The phasing,
variable bandwidth filtering, and AGC would be done in software. The
DSP processor could also control an input attenuator for compound
AGC.
Of course, there would be considerable potential for differential
amplitude and phase between the two DSP input channels, but an
adaptive equalizer could be programmed which determines these errors
by tuning across a reference carrier and building an equalization
table. The resulting receiver would be high performance, feature rich,
extremely reproducable, and easy to adapt for multi-band operation.

Joe
WA3CMQ


From Unknown Wed Dec 27 18:28:16 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.msfc.nasa.gov!elroy.jpl.nasa.gov!decwrl!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news
From: Zack Lau <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DC Rcvr w/DSP backend
Date: Tue, 26 Dec 1995 09:59:19 -0800
Organization: American Radio Relay League
Lines: 18
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
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To: Rocci <[e-mail]>

I got the interesting suggestion that a DSP
delay line be used to allow the DSP time to
do its signal processing. Supposedly, this
would allow the DSP to control the AGC.

This doesn't quite work, unless you didn't
really need the AGC in the first place.  If
you do need it, those samples in the delay
line are worthless.

However, you ought to be able to use DSP to
combine multiple bit steams seamlessly.  Suppose
you had four 16 bit A/D converters with different
amounts of gain ahead of them.  Properly done, this
ought to extend the single tone dynamic range of
the system considerably.

Zack KH6CP/1


From Unknown Wed Dec 27 18:28:18 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb
From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DC Rcvr w/DSP backend
Date: 27 Dec 1995 21:28:07 GMT
Organization: Hewlett Packard Corvallis Site
Lines: 39
Message-ID: <4bsdp7$[e-mail]>
References: <4brm1t$[e-mail]>
NNTP-Posting-Host: hplsnb.lsid.hp.com
X-Newsreader: TIN [version 1.1 PL9.4]

Zack Lau ([e-mail]) wrote:
: >
: One bit stream handles -140 to -60 dBm
: another bit stream handles -120 to -40 dBm
: another handles -100 to -20 dBm
: the last handles -80 to 0 dBm
: You can switch to less sensitive bit streams as the signals get
: louder.

Except for a very small advantage in the ability to switch quickly
and with minimum transient, this should be no different than
switching gain ahead of the ADC.  Unless you have money to toss at
ADCs, it seems like the switched gain (or just controlled gain) would
be a more reasonable way in the typical ham application to do it.

: Thus, the system ought to handle signals from -140 dBm through
: 0 dBm without overloading. Of course, loud signals will prevent
: you from hearing weaker signals simultaneously.

Another way to get almost all of that is start with something like
the Burr-Brown 20 bit delta-sigma converter, assuming we are talking
about baseband converters to go with direct conversion front ends.
Then you don't have to worry about switching anything.  That system
has something around 90dB of dynamic range:  that is, if you put in
a full-scale signal, distortion products appear at about the -90dB
level, but if you drop the input level, the distortion products go
down.  However, noise starts to get you at the 120dB below full scale
level, depending on how you are looking at it.

These 20-bit (stereo) converters aren't exactly dirt cheap yet, but
it does seem like they are in striking range of hobbiests.  Better plan
to do better than 16 bit arithmetic with the results, though!  And to get
this sort of dynamic range, you must be very careful in your construction
techniques, and provide very clean power.

--
Cheers,
Tom
[e-mail]


From Unknown Wed Dec 27 18:28:19 1995
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From: [e-mail] (Harry H. Brown)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: design transfer
Date: 22 Dec 1995 17:39:58 GMT
Organization: Sun Microsystems
Lines: 4
Distribution: world
Message-ID: <4beqhe$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ew0203.resd.vf.ge.com

I have used conventional copy machine overhead projector clear film and specia
l laser clear film on my HP 4L and both worked fine. I couldn't find much of a
 difference in quality.

73, Harry, W3IIT



From Unknown Wed Dec 27 18:28:20 1995
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From: [e-mail] (Conway Yee)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: Do DSP's really help?
Date: 23 Dec 1995 20:12:40 GMT
Organization: Medical Image Processing Group, U of Penn
Lines: 63
Message-ID: <[e-mail]>
References: <[e-mail]> <4behri$[e-mail]>
NNTP-Posting-Host: mipgsun.mipg.upenn.edu
In-reply-to: [e-mail]'s message of 22 Dec 1995 10:11:46 -0500
Xref: news.epix.net rec.radio.amateur.equipment:22996 rec.radio.amateur.homebrew:12356

>Experimenting is a good idea, it's fun and sure helps us learn.
>
>But DSP's fast enough to do anything at a real IF aren't cheap, and
>neither are the A/D converters. Expect to spend several times what the 101
>cost you if you take this route.
>
>Ham manufacturers do radio DSP by using a very very low IF. So low it's
>almost at audio. So it's almost exactly like audio DSP anyway!!!!

This brings an interesting point.  How far should one go in hacking an
old rig?  Personally, I own the rig not because of its resale value.
I don't figure on ever selling it.  Yes, I am a major packrat.  I
figure that if I ever get rid of it, it will because I have toasted
the rig so badly that I can't even salvage parts.  At that point, I'll
buy another one and start all over.

The high price of DSP chips is a case in point.  In order to add it, I
will be spending MORE on the enhancement than the actual worth of the
rig.  Does it bother me all that much?  Not really.  I figure that I
run a higher risk of toasting the DSP chip while experimenting than
actually enhancing the rig's performance.  But what the heck!  I
consider it a pretty neat hack and worth while doing all by itself.
The trick however, is to choose a project that is sufficiently
difficult that you end up learning something useful but not so
difficult that you give it all up entirely.

As someone who is building single units and not mass producing
anything, cost effective manufacturing is not a factor.  I can try
things that any sane manufacturer would never try if they are
interested in staying in business.  I don't have to worry about the
marketability and pricing of the unit.  Profitability is not an
issue.  My benefit from playing with the rig is the hack itself.

Personally, I think more hams should try picking up a soldering iron.
So what if you get burned once in awhile from the soldering iron
because you are extra clumsy or if you decide to build something that
toasts your equipment?  The aim of the game is to try to do something
that you could do before or thought that you can never do.  Who knows,
you might surprise yourself!  But then, to each his own.  Different
folks for different strokes.

P.S.  A great starter project for those who are inclined is the
      CMOS Super Keyer.  While I haven't personally seen version III,
      version II is very easy to build.  From the article in QST in
      August, none of the changes made in version III would make it
      any harder to build.  You end up with a useful unit with only an
      afternoon's work.  There is nothing so tight that it is
      difficult to solder.  The problem with the keyer is that
      once you build the kit, you might actually become tempted to
      become proficient at CW.

      Try it, Mikey, you might like it.

      Another problem with the kit is that source code is not
      available for version III but that is another thread entirely :)
      Does anyone have the code to version II lying around?  I have
      been meaning to ask for it.

--
                                  |       73 de Conway Yee, N2JWQ  | DON'T
                                  | EMAIL     : [e-mail] | TREAD
                                  | TELEPHONE :                    |  ON
                                  | FAX       :                    |  ME!


From Unknown Wed Dec 27 18:28:24 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!newsfeed.internetmci.com!in2.uu.net!iglou!jdv
From: [e-mail] (John Vause)
Subject: Re: Ext mic mod for HTX-202 and HTX-404
X-Nntp-Posting-Host: iglou
Message-ID: <[e-mail]>
Sender: [e-mail] (News Administrator)
Organization: IgLou Internet Services (1-800-436-4456)
References: <4b9bnj$[e-mail]>
Date: Sat, 23 Dec 1995 16:00:41 GMT
Lines: 19

[e-mail] (K Short) writes:

>  There is a web page that describes how to modify the ext speaker
>mic sold by Radio Shack.   The modified mic will provide the proper
>level needed by the radio for good modulation.  The information
>can also be applied to other brands of speaker mic's.  Check out :

>http://pages.prodigy.com/CA/LA/htx202htx404/htx202htx404.html

Does this work/improve audio if you use the modified mic
with a Yaesu ft-51r?

John KF4ERV

--
*********************************************************************
* Defenselessness is a crime which generates it's own punishment.   *
* The four boxes of Freedom: Soap, Ballot, Jury, and Ammo.          *
*********************************************************************


From Unknown Wed Dec 27 18:28:24 1995
Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: John&[e-mail] (John&Suzie Rollins)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ham-Homebrew Digest V95 #459
Date: 24 Dec 95 06:34:51 GMT
Organization: Portland Mac Users Group
Lines: 1
Message-ID: <[e-mail]>
Reply-To: John&[e-mail]
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Cool! eMail!


From Unknown Wed Dec 27 18:28:25 1995
Path: news.epix.net!uunet!in2.uu.net!interaccess!d171.nb.interaccess.com!user
From: [e-mail] (Dave Moorman)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ham-Homebrew Digest V95 #459
Date: Mon, 25 Dec 1995 06:31:33 -0600
Organization: InterAccess, Chicago's best Internet Service Provider
Lines: 9
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: d166.nb.interaccess.com

In article <[e-mail]>, John&[e-mail] wrote:

> Cool! eMail!

Tell us more!

Dave Moorman
Downers Grove,
Illinois


From Unknown Wed Dec 27 18:28:26 1995
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From: John&[e-mail] (John&Suzie Rollins)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ham-Homebrew Digest V95 #460
Date: 25 Dec 95 06:56:51 GMT
Organization: Portland Mac Users Group
Lines: 1
Message-ID: <[e-mail]>
Reply-To: John&[e-mail]
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Cool! eMail!


From Unknown Wed Dec 27 18:28:27 1995
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From: [e-mail] (richard smith)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ham-Homebrew Digest V95 #460
Date: 26 Dec 95 05:13:56 GMT
Organization: ucsd usenet gateway
Lines: 2
Message-ID: <Pine.SUN.3.91.951226001341.14151W-100000@scfn>
References: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

unsubscribe



From Unknown Wed Dec 27 18:28:28 1995
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From: John&[e-mail] (John&Suzie Rollins)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ham-Homebrew Digest V95 #461
Date: 26 Dec 95 12:21:01 GMT
Organization: Portland Mac Users Group
Lines: 15
Message-ID: <[e-mail]>
Reply-To: John&[e-mail]
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

>>In article <[e-mail]>, John&[e-mail]
>>wrote:
>>
>>> Cool! eMail!
>>
>>Tell us more!


Yeah, well I had set up my auto-respond to bug someone who wouldn't stop
sending me messages, and I forgot to turn it off when I subcribed to several
mailing lists, and, well, it made a BIG mess. This is just one of a few
mailing lists that got that message a number of times. I finally figured it
out and turned it off. Sorry.

-JR


From Unknown Wed Dec 27 18:28:29 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (wayne barnhart)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ham-Homebrew Digest V95 #463
Date: 26 Dec 95 20:00:00 GMT
Organization: ucsd usenet gateway
Lines: 18
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

>
///////////////////////////////////////////////////////////
>////////////////////////////////////////////////////////////
>////////////////////////////////////////////////////////////
>////////////////////////////////////////////////////////////
>////////////////////////////////////////////////////////////
>////////////////////AP////////////////////////8AAP//AAD/////
>////////AAD/AAD///8AAP////8AAP8AAP//AAD///8AAP//////////////


Cant this stuff be posted somewhere where it can be accessed by those who care
?
Went through about 8 pages of it last week or so and I think it is not only
a waste of my time but expensive to those who have to download the list and
are not directly connected to the net.

Wayne Barnhart  WB7WHI                               Dirt is good!
Spokane, Wa.



From Unknown Wed Dec 27 18:28:30 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail](Wanda M Desmond )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Heat Sink's-Where??
Date: 27 Dec 1995 08:26:59 GMT
Organization: Netcom
Lines: 15
Message-ID: <4br00j$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: bak-ca1-25.ix.netcom.com
X-NETCOM-Date: Wed Dec 27 12:26:59 AM PST 1995

In <[e-mail]> Rick Perry <[e-mail]> writes:
>
>Does anyone know where I can buy large heat sinks for high power solid
>state amps?  Only place I know of is CCI and they only have one size.
>
>TNX,
>Rick, KG7A

Try RF Parts, 435 South Pacific St., San Marcos, CA 92069. 800-737-2787
or 619-744-0700. Fax [phone]. They list heat sinks in their
catalog ranging in size from 4.125" x 3" to 7.875" x 16". Prices range
from $9.00 to $56.65.

John
KE6TGN


From Unknown Wed Dec 27 18:28:31 1995
Path: news.epix.net!news.sprintlink.net!ratty.wolfe.net!usenet
From: Rick Perry <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Heat Sink's-Where??
Date: Wed, 27 Dec 1995 03:05:18 -0800
Organization: Wolfe Internet Access, L.L.C.
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Does anyone know where I can buy large heat sinks for high power solid
state amps?  Only place I know of is CCI and they only have one size.

TNX,
Rick, KG7A


From Unknown Wed Dec 27 18:28:32 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail](michael silva)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Heat Sink's-Where??
Date: 27 Dec 1995 19:53:50 GMT
Organization: Netcom
Lines: 14
Message-ID: <4bs88e$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: val-ca1-05.ix.netcom.com
X-NETCOM-Date: Wed Dec 27 11:53:50 AM PST 1995

In <[e-mail]> Rick Perry <[e-mail]> writes:
>
>Does anyone know where I can buy large heat sinks for high power solid
>state amps?  Only place I know of is CCI and they only have one size.

Newark has many pages of heat sinks.  Last I heard they had a $25
minimum order.  Their number (at least for a catalog) is 800-298-3133.

You might also try the Hosfelt, MP Jones and All Electronics catalogs.
If you need phone numbers I can look them up for you.

73,
Mike, KK6GM



From Unknown Wed Dec 27 18:28:33 1995
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From: [e-mail] (UGH)
Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Help with Icom 720A on Amtor A.
Date: Wed, 27 Dec 1995 23:22:36 GMT
Organization: Midland Internet Limited, Network Services
Lines: 28
Message-ID: <4bshcn$[e-mail]>
NNTP-Posting-Host: phoenix.midland.co.nz
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Xref: news.epix.net rec.radio.amateur.digital.misc:13356 rec.radio.amateur.equipment:23127 rec.radio.amateur.homebrew:12398

>ZL1ANY/TPK 1.82 Msg #:259  Date:19-11-95  Time:11:08Z
>
>
>      Trying to use icom 720a on amtor mode a.
>I  note  in  the  instruction  manual    (p16 5.2.3) they say it has a fast
>attack/slow release agc system.  I have adjusted the vox delay pot
>to a minimum (no. 37 in photo on page 9) and am keying and feeding the
>tx drive audio via the mic socket a la fig. on page 19.
>
>       1/ amtor mode b and rtty work fine but any arq operation (amtor
>pactor ... have not tried clover) causes problems ...the
>transceiver keys on and off but it seems the agc recovery even
>with the agc button in fast position is so slow that the receiver is
>severely desenced ....
>       2/also although the transceiver keys with the
>vox button turned off no power  is transmitted(despite mic gain well up)
>.. need the vox activated to produce power out.This is puzzelling
>as  it  seems  to  me that it should behave just like the microphone (which
>does not need the vox activated to transmit a signal.
>        Does any one have a fix for the first problem ...and/or an
>explanation for the second?
>
>        many thanks
>        Stephen
>
>




From Unknown Wed Dec 27 18:28:34 1995
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From: [e-mail] (TANTONR)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HF installation in Toyota pickup
Date: 22 Dec 1995 20:43:23 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 21
Sender: [e-mail]
Message-ID: <4bfmrr$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail] (TANTONR)
NNTP-Posting-Host: newsbf02.mail.aol.com

Have a 1992 toyota P? with an aluminum cap.  have run my yaesu FT-757GX
with a tuner in it with no problems whatsoever.  When I bought it, I asked
if it has computer chips, electronic controls, etc... the dealer said no.
I said "good- I'll take it!" (this was in the U.S, BTW).  Works FB- no
noise that the factory supplied Yaesu NB couldn't take care of on any
band.  Keep leads to ground really short and U should be fine.

My truck is a 2 wheel drive STRIPPED base model, not 4WD, not the T-1000
or Tacoma, BTW.

I have abused the living shit out of this truck- missed oil changes, high
miles (100,000 since march 1992), put in and take out a military radio
shelter (I had to add $245 worth of rubber spring savers- REALLY WORTH
WHILE INVESTMENT if U are going to be using it HARD.  Mine worked fine for
2 1/2 years w/o them, but needed to add them when I got the radio shelter.
 Have filled it to the brim with books, wood, moved 3 times, etc, etc.-
has never let me down.  Not bad for a $7,800 investment New.

Again, NO RF PROBLEMS AT ALL.  Good luck!

VE3IEY


From Unknown Wed Dec 27 18:28:35 1995
Path: news.epix.net!news.sprintlink.net!news.magicnet.net!news.supernet.net!usenet.eel.ufl.edu!news.ultranet.com!zombie.ncsc.mil!nntp.coast.net!news00.sunet.se!sunic!news99.sunet.se!news.funet.fi!ns.imtg.fi!news.csc.fi!nokia.fi!news.nmp.nokia.com!news
From: Ilkka Kontola <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Impedance matching HELP
Date: 22 Dec 1995 08:47:30 GMT
Organization: NMP
Lines: 22
Message-ID: <4bdrb2$[e-mail]>
References: <4b7rtg$[e-mail]>
NNTP-Posting-Host: trepc227.nmp.nokia.com
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[e-mail] (RRives) wrote:
>I am trying to biuld a 15 meter amp for my mfj 9015 qrp rig. I need help
>matching the 50 ohm output impedance of the rig to the low input
>inpendance of the mrf 450 transistor that I am using for the amp. I >would
>like to use a pi-network to match the impedance but I dont know what the
>input impedance of the transistor is.

The MRF454 is supposed to be some kind of a replacement to the MRF450.

MRF454 has (at 12.5 V, 60 W out, 30 MHz) the following input
and output impedances:

Zin = 1.66 - j0.844 ohms
Zout = 1.73 - j0.188 ohms

73, Ilkka
--
Ilkka Kontola                           Amateur radio: oh3njc
Nokia Mobile Phones
Tampere, Finland




From Unknown Wed Dec 27 18:28:36 1995
Newsgroups: rec.radio.amateur.homebrew
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From: dave eckhardt <[e-mail]>
Subject: Re: Impedance matching HELP
Sender: [e-mail] (Boise Site News Server)
Message-ID: <[e-mail]>
Date: Thu, 21 Dec 1995 20:31:29 GMT
Content-Transfer-Encoding: 7bit
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I would strongly recommend against attempting this project with no
knowledge of the device you have chosen to use.  Get a copy of the
Motorola RF Manual which I believe ARRL offers for a nominal price.  I
could walk you through the procedure, but you need some background of the
device characteristics.  The Mot book also gives a number of good
tutorials on various methods of matching from HF to uwave.

Dave Eckhardt  W6LEV

[e-mail]   (work)
[e-mail]



From Unknown Wed Dec 27 18:28:37 1995
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From: [e-mail] (Christer Johansson)
Newsgroups: comp.robotics.misc,comp.home.automation,sci.electronics,sci.electronics.misc,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: L.O.S.A Contribution Form
Date: Sat, 23 Dec 1995 23:51:50 GMT
Organization: HTH
Lines: 74
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Reply-To: [e-mail]
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Xref: news.epix.net comp.robotics.misc:2345 comp.home.automation:12816 sci.electronics:163413 rec.radio.amateur.homebrew:12359 rec.radio.amateur.misc:95961


List Of Stamp Applications (L.O.S.A for short)
==============================================

If you have done something with the BASIC Stamp (big or small)
that you are willing to tell others please use the form below and
write a short description, nothing fancy is needed just a simple
explanation. If you have source code to share that's even better but
it's not necessary.

Then e-mail the form to:

     [e-mail]

With the following as the subject:

     L.O.S.A Contribution

Or you could point your Web-browser to the following URL and fill in
the L.O.S.A form on the Web-page...

     http://www.algonet.se/~cj/losa.html

The latest version of L.O.S.A is going to be posted to the following
mailing lists and news groups, I will update it approx. once a month.

Mailing lists:

BASIC Stamp Mailing List

News groups:

comp.robotics.misc
comp.home.automation
sci.electronics
sci.electronics.misc
rec.radio.amateur.homebrew
rec.radio.amateur.misc

[--- cut ---]

======================================================================
                    - L.O.S.A Contribution Form -
======================================================================
 New Contribution [ ]  Update [ ]
----------------------------------------------------------------------

 Title :
 Author:                                       Date:

 E-mail: (optional)
----------------------------------------------------------------------

 Stamp model   : BASIC Stamp/BS1-IC/BS2-IC
 Code available: YES/NO
 Filename      : (optional)
 URL           : (optional)
----------------------------------------------------------------------
 Description   : (5-50 rows describing your application)


======================================================================

[--- cut ---]

If you think something are missing in the "L.O.S.A Contribution Form"
please let me know and I will add it.

Regards,

/Christer





From Unknown Wed Dec 27 18:28:39 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!news.iadfw.net!usenet
From: [e-mail] (Kerry Miller)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Looking for Amplifier Plans
Date: Fri, 22 Dec 1995 22:25:25 GMT
Organization: customer of Internet America
Lines: 32
Message-ID: <4bfb9l$[e-mail]>
References: <4bek1a$[e-mail]>
NNTP-Posting-Host: dal04-15.ppp.iadfw.net
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Brent Childers) wrote:

>I am looking for plans to a 10 - 160 amplifier.  I want it to run 1.5
>kw without pushing it to the limit.  Also, I would prefer to use one
>of the lesser expensive tubes (i.e. no 8877's).  Any help would be
>appreciated.

>               Thanks all - 73 de Brent (KI5JC)

Brent,
     I hate to sound like a broken record, but I think there is an amp
schematic in the handbook for a pr of 3-500z's.  There is also one for
8877.  You should be able to get a used 8877 if you shop carefully.
Both amps are a little over-designed with features, IMHO.  If you
build one with 8877's or any other ceramic tube, you need to be sure
to include any grid current limiters or grid trips, fuses, etc.
Excessive drive/grid current will wipe out a ceramic tube in a hurry.
I am using (however infrequently) a pr of 3-500's.  They sure light up
pretty, lets see you do that with an 8877!
        Alpha used 8874's for a long time, you might find some of them second
hand too.  If you buy them second hand, make sure you can get your
money back or get the guy to demonstrate them in his amp.  You can't
tell my looking if they are good or not.  At least a glass tube you
can tell if the plate has holes blown in it!
        Have fun building the amp.  If you have old tubes lying around, I
think I also have plans (somewhere) for a pr of 813's and one for 2 or
3 - 811's.  This is a big switch from the qrp schematic thread I was
in!
73,
Kerry




From Unknown Wed Dec 27 18:28:40 1995
Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!pacifier!news
From: jgoecks <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Low power FM transmitter ICs
Date: 23 Dec 1995 23:27:08 GMT
Organization: Pacifier Internet Server [phone]
Lines: 14
Message-ID: <4bi38d$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ip84.van3.pacifier.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)

David Skinner <[e-mail]> wrote:
>Can anyone help me??
>
>Do any of the major semiconductor manufacturers make an off-the-shelf
>IC which operates as a low power FM transmitter? You know, the sort
>of thing one might use to build a cordless baby alarm or bugging
>device.


Yes.  Motorola makes the MC2833 FM transmitter chip.  It is
usually operated with a XTAL at 1/3 the operating frequency and
requires a bunch of caps, resistors, and inductors to make it
work.



From Unknown Wed Dec 27 18:28:40 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!uunet!in2.uu.net!news.pcis.net!not-for-mail
From: [e-mail] (Ed Matthews)
Subject: Re: Lowest PC Memory Prices!
Message-ID: <[e-mail]>
Date: Sat, 23 Dec 1995 16:53:22 GMT
References: <[e-mail]>
X-Newsreader: Forte Agent .99c/16.141
Lines: 20

On Wed, 13 Dec 1995 18:50:46 -0700, Rudy <[e-mail]>
wrote:

>High Sales Volume = Lowest Prices!
>
>Because of high volume sales to the US Government, State
>Government, and National Laboratories, Atomic City Electronics,
>Inc. of Los Alamos, New Mexico is offering PC memory at
>outstanding prices:
>
>4 MB  (1X32) $129.95
>8 MB  (2X32) $249.95
>16 mb (4x32) $479.95
>
>All are new NP 70 ns 72 pin Simms.

My local Nerd junkie dealer does better than this in Springfield,
Missouri, gateway to Branson.

I suppose it is possible one or two of you have never been here...



From Unknown Wed Dec 27 18:28:41 1995
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (Rhyolite95)
Newsgroups: rec.radio.amateur.homebrew
Subject: Making PC boards from laser printer
Date: 21 Dec 1995 22:22:41 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 8
Sender: [e-mail]
Message-ID: <4bd8a1$[e-mail]>
Reply-To: [e-mail] (Rhyolite95)
NNTP-Posting-Host: newsbf02.mail.aol.com

I have a bunch of TEC-200 transparency material from Meadowlake Corp. This
stuff was to be used in a copier and then ironed onto a bare PC board.

Has any one tried it in a laserprinter??

Mine is an HP-4L and has an envelope mode that feeds straight through.

Will it work??


From Unknown Wed Dec 27 18:28:42 1995
Path: news.epix.net!news.sprintlink.net!alpha.sky.net!winternet.com!uunet!in1.uu.net!newsfeed.internetmci.com!swrinde!cs.utexas.edu!howland.reston.ans.net!plug.news.pipex.net!pipex!tube.news.pipex.net!pipex!dish.news.pipex.net!pipex!pipex-sa.net!usenet
From: [e-mail] (Tim Jackson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Making PC boards from laser printer
Date: Fri, 22 Dec 1995 06:56:49 GMT
Organization: pipex-sa.net
Lines: 16
Message-ID: <[e-mail]>
References: <4bd8a1$[e-mail]>
NNTP-Posting-Host: pop49.dial.pipex.co.za
X-Newsreader: Forte Agent .99c/16.141

>I have a bunch of TEC-200 transparency material from Meadowlake Corp. This
>stuff was to be used in a copier and then ironed onto a bare PC board.
>
>Has any one tried it in a laserprinter??
>
>Mine is an HP-4L and has an envelope mode that feeds straight through.
>
>Will it work??

You can definitely feed it through your 4L. I have done it on mine
without any problem. The process the printer uses is essentially the
same as that of a plain paper copier.

The problem is that I couldn't get a good transfer from the film onto
the PCB.



From Unknown Wed Dec 27 18:28:43 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!globe.indirect.com!usenet
From: [e-mail] (Jeff Duntemann)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Modiying an old tube AM radio with pencil tubes, results
Date: Wed, 27 Dec 1995 20:47:58 GMT
Organization: The Coriolis Group, Inc.
Lines: 31
Message-ID: <4bsbgi$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: s83.phxslip4.indirect.com
X-Newsreader: Forte Free Agent v0.55

[e-mail] (Robert Casey) wrote:

>I've thought of using some of these sub-mini tubes in an AM BC band
>radio, like the old AC/DC "AA5" tube radios.  So I took an
>otherwise ordinary AA5 tube radio (AA5 = "All American 5 tube")
>and decided to modify it to use some pencil tubes.

This is seriously cool.  If I recall correctly (and I'm at work and
have none of my catalogs handy) Antique Electronics Supply here in the
Phoenix area (Tempe, Arizona, actually) now sells a simple AM radio
kit that uses subminiature tubes.  They seemed to indicate that they
made the kit up because of an *overstock* of submini tubes, so they're
a good supplier option if you ever need one for this kind of research.

It's good to recall that the AA5 as we knew it in the late 50's was
the product of over 35 years of product evolution and relentless
competition.  I would guess it's a good design.  The flipside is that
submini tubes were also created for AA5-style applications.  I
dismantled a late 50's RCA portable years back that used submini
tubes, so it's quite possible that the general characteristics of the
12AV6 and the submini you used were pretty close.

Wish I'd kept that portable now, sigh.  It had a wonderful 50's late
deco case in red plastic.

--73--

--Jeff Duntemann KG7JF
  Scottsdale, Arizona




From Unknown Wed Dec 27 18:28:44 1995
Path: news.epix.net!news.sprintlink.net!news1.cris.com!news
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Need a Mod for RS  DX-392
Date: 26 Dec 1995 20:20:31 GMT
Organization: Concentric Internet Services
Lines: 8
Message-ID: <4bplef$[e-mail]>
NNTP-Posting-Host: cnc086031.concentric.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2 (Windows; U; 16bit)

I need a mod to disable the "receiver muting while tuning" on the radio
shack dx-392. i have a mod for the dx-390 but these radios appear very
different inside. please email me at [e-mail]

thanks,
Tom Medlin, WA5KUB
[e-mail]



From Unknown Wed Dec 27 18:28:45 1995
Path: news.epix.net!news.sprintlink.net!nntp.coast.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail](Wanda M Desmond )
Newsgroups: rec.radio.amateur.homebrew
Subject: NEED Schematic for DTMF decoder Using SSI202P chip
Date: 24 Dec 1995 00:50:39 GMT
Organization: Netcom
Lines: 11
Message-ID: <4bi84v$[e-mail]>
References: <4bi73v$[e-mail]> <4bi81j$[e-mail]>
NNTP-Posting-Host: bak-ca1-07.ix.netcom.com
X-NETCOM-Date: Sat Dec 23  4:50:39 PM PST 1995

Title pretty much says it all. Need a schematic for a DTMF decoder
using the SSI202P chip (I picked up three of the chips at a swap meet
for a buck each, they were still sealed in their Rat Shack packaging).

I need a unit that is handheld, uses an LCD screen, and is not
connected to a computer.

Thanks!!

John
KE6TGN


From Unknown Wed Dec 27 18:28:46 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!news.net99.net!news.localnet.com!usenet
From: "Peter C. McNulty" <[e-mail]>
Newsgroups: rec.radio.amateur,rec.radio.amateur.antenna,rec.radio.amateur.digital,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.packet,rec.radio.amateur.policy,rec.radio.amateur.space,re
Subject: Re: New Ham Web Site with Information Content
Date: 25 Dec 1995 16:53:54 GMT
Organization: LocalNet Corporation
Lines: 4
Message-ID: <4bmkv2$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ppp11.conn.localnet.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Macintosh; I; 68K)
X-URL: news:[e-mail]
Xref: news.epix.net rec.radio.amateur.antenna:18015 rec.radio.amateur.digital.misc:13336 rec.radio.amateur.equipment:23055 rec.radio.amateur.homebrew:12367 rec.radio.amateur.misc:96046 rec.radio.amateur.policy:32335 rec.radio.amateur.space:6015

Also see WEB Site at for interesting Ham Radio
Links.URL:http://www.localnet.com/~wa1sov/




From Unknown Wed Dec 27 18:28:47 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!news.accessone.com!news
From: [e-mail] (Ed Mitchell)
Newsgroups: rec.radio.amateur,rec.radio.amateur.antenna,rec.radio.amateur.digital,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.packet,rec.radio.amateur.policy,rec.radio.amateur.space,re
Subject: Re: New Ham Web Site with Information Content
Date: 27 Dec 1995 22:27:56 GMT
Organization: Virtual Publishing Co.
Lines: 21
Message-ID: <4bsh9c$[e-mail]>
References: <[e-mail]> <4bmkv2$[e-mail]>
NNTP-Posting-Host: vbook.accessone.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.5
Xref: news.epix.net rec.radio.amateur.antenna:18067 rec.radio.amateur.digital.misc:13357 rec.radio.amateur.equipment:23128 rec.radio.amateur.homebrew:12399 rec.radio.amateur.misc:96136 rec.radio.amateur.policy:32348 rec.radio.amateur.space:6028

In article <4bmkv2$[e-mail]>, [e-mail] says...
>
>Also see WEB Site at for interesting Ham Radio
>Links.URL:http://www.localnet.com/~wa1sov/
>
>

Check out Ham Radio Online at
http://www.accessone.com/~vbook/hronline.htm

Newsletters, Feature Stories, Real-time solar and radio propagation conditions
,
real-time disaster communications news (world wide earthquake, volcanic and
severe weather reports). In short, real content, not just pointers to
hyperspace.

73, Ed, KF7VY
------------------------
personal email to [e-mail]
Visit Ham Radio Online, it's free, at
http://www.accessone.com/~vbook/hronline.htm



From Unknown Wed Dec 27 18:28:48 1995
Path: news.epix.net!news.sprintlink.net!nuclear.microserve.net!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re:Phono Preamp needed
Date: Thu, 21 Dec 95 20:51:00 GMT
Organization: Microserve Information Systems (800)-380-INET
Lines: 5
Distribution: world
Message-ID: <4bds0o$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

   [e-mail] wrote:

>I'm amazed they still sell stuff like that for vinyl.

That's because vinyl still sounds better than CD's.  :-)


From Unknown Wed Dec 27 18:28:49 1995
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.msfc.nasa.gov!elroy.jpl.nasa.gov!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (William L. Fuqua III)
Newsgroups: rec.radio.amateur.homebrew
Subject: picking harmonics off of vfo inductor?
Date: 22 Dec 95 13:02:41 GMT
Organization: ucsd usenet gateway
Lines: 24
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

At 07:33 PM 12/21/95 PST, Larry Braden KC5CWG wrote:

>Is it possible to successfully pick off the 2, 3,or 5th harmonic
>off a VFO inductor by placing a coil wound for the harmonic close
>to the inductor, both wound on a form positioned vertically off the
>groundplane and trimmed with small trimmer caps?  Perhaps wrapping a
>single link of insulated wire around both coils?
  Almost all the energy in the tuned circuit of an oscillator
is at the fundamental frequency. Probably less than a percent
at any harmonic. You could use a loop and a diode to produce the
harmonics or a non-linear amplifier.

 73
 Bill ko4ww

  William L. Fuqua III  P.E.
  Department of Physics and Astronomy
  CP-177 Chem. Phys. Bldg.
  University of Kentucky
  Lexington, Ky 40506-0055
  E-mail [e-mail]
  Phone [phone]




From Unknown Wed Dec 27 18:28:50 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!world!mv!usenet
From: [e-mail] (Andy Borsa)
Subject: Re: picking harmonics off of vfo inductor?
Message-ID: <[e-mail]>
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
Organization: RF/Wireless Design Consultant
Date: Sat, 23 Dec 1995 04:52:13 GMT
References: <4bbvo6$[e-mail]>
X-Newsreader: WinVN 0.99.6
X-Nntp-Posting-Host: moose.mv.com
Lines: 24

In article <4bbvo6$[e-mail]>, [e-mail]
says...
>
>Is it possible to successfully pick off the 2, 3,or 5th harmonic
>off a VFO inductor by placing a coil wound for the harmonic close
>to the inductor, both wound on a form positioned vertically off the
>groundplane and trimmed with small trimmer caps?  Perhaps wrapping a
>single link of insulated wire around both coils?

Here's what I've successfully done to get a 975 MHz harmonic from a 325 MHz
VCO -
1.  Design the VCO with tank circuit/feedback in the base-emitter.
2.  Take the desired fundamental from the tank circuit.
3.  Use the collector to drive a 50 ohm load.  This low impedance will help
minimize interaction between the collector and tank.  The collector waveform
will be very rich in harmonics because it's produced by the highly non-linear
collector current waveform.  A spectrum analyzer showed the 975 MHz at a few
dB below the fundamental.
4.  Filter the collector output as required to subdue the undesired spectral
lines.

--
    Andy Borsa -- !!!The Universe is discretely analog!!!



From Unknown Wed Dec 27 18:28:51 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!nntp.coast.net!col.hp.com!news.dtc.hp.com!hpscit.sc.hp.com!rkarlqu
From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: picking harmonics off of vfo inductor?
Date: 25 Dec 1995 17:55:44 GMT
Organization: Hewlett-Packard
Lines: 34
Message-ID: <4bmoj0$[e-mail]>
References: <4bbvo6$[e-mail]> <[e-mail]>
NNTP-Posting-Host: hpscrj.scd.hp.com

In article <[e-mail]>, Andy Borsa <[e-mail]> wrote:
>In article <4bbvo6$[e-mail]>, [e-mail]
>says...
>>
>>Is it possible to successfully pick off the 2, 3,or 5th harmonic
>>off a VFO inductor by placing a coil wound for the harmonic close
>>to the inductor, both wound on a form positioned vertically off the
>>groundplane and trimmed with small trimmer caps?  Perhaps wrapping a
>>single link of insulated wire around both coils?
>
>Here's what I've successfully done to get a 975 MHz harmonic from a 325 MHz
>VCO -
>1.  Design the VCO with tank circuit/feedback in the base-emitter.
>2.  Take the desired fundamental from the tank circuit.
>3.  Use the collector to drive a 50 ohm load.  This low impedance will help
>minimize interaction between the collector and tank.  The collector waveform
>will be very rich in harmonics because it's produced by the highly non-linear

>collector current waveform.  A spectrum analyzer showed the 975 MHz at a few
>dB below the fundamental.
>4.  Filter the collector output as required to subdue the undesired spectral
>lines.
>
>--
>    Andy Borsa -- !!!The Universe is discretely analog!!!


Andy is absolutely right here.  I have done this many times and the collector
current waveform invariably looks like an impulse train.  A standard technique
 is to
put a parallel tuned circuit in the collector tuned to the desired harmonic.
Works very well.

Rick N6RK
[e-mail]



From Unknown Wed Dec 27 18:28:53 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!frankensun.altair.com!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb
From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: picking harmonics off of vfo inductor?
Date: 27 Dec 1995 00:31:30 GMT
Organization: Hewlett Packard Corvallis Site
Lines: 25
Message-ID: <4bq452$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: hplsnb.lsid.hp.com
X-Newsreader: TIN [version 1.1 PL9.4]

Andy Borsa ([e-mail]) wrote:

: Here's what I've successfully done to get a 975 MHz harmonic from a 325 MHz
: VCO -
: 1.  Design the VCO with tank circuit/feedback in the base-emitter.
: 2.  Take the desired fundamental from the tank circuit.
: 3.  Use the collector to drive a 50 ohm load.  This low impedance will help
: minimize interaction between the collector and tank.  The collector waveform

: will be very rich in harmonics because it's produced by the highly non-linea
r
: collector current waveform.  A spectrum analyzer showed the 975 MHz at a few

: dB below the fundamental.
: 4.  Filter the collector output as required to subdue the undesired spectral

: lines.

I think Andy's advice is sound.  An example I saw was in the LO chain in a
450MHz pager receiver:  6V supply.  49MHz 3rd overtone xtal; tuned b-e
circuit.  Tank in collector tuned to 3rd harmonic, 150MHz.  DC comes down
through another transistor, which has its base driven by that 3rd harmonic,
and has a tank in its collector tuned to 450Mhz.  Compact, and efficient use
of limited available power.

--
Cheers,
Tom
[e-mail]


From Unknown Wed Dec 27 18:28:54 1995
Path: news.epix.net!news.sprintlink.net!news.connect.net!usenet
From: [e-mail] (David Bengtson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: picking harmonics off of vfo inductor?
Date: Tue, 26 Dec 1995 23:48:28 GMT
Organization: Connection Technologies
Lines: 33
Message-ID: <4bq1dk$[e-mail]>
References: <4bbvo6$[e-mail]> <[e-mail]> <4bmoj0$[e-mail]>
NNTP-Posting-Host: a1p02.connect.net
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Richard Karlquist) wrote:

>In article <[e-mail]>, Andy Borsa <[e-mail]> wrote:
>>In article <4bbvo6$[e-mail]>, [e-mail]
>>says...

>Andy is absolutely right here.  I have done this many times and the collector
>current waveform invariably looks like an impulse train.  A standard techniqu
e is to
>put a parallel tuned circuit in the collector tuned to the desired harmonic.
>Works very well.

>Rick N6RK
>[e-mail]

Another suggestion is to use another stage at the output of the VCO
simply to do the frequency multiplication. In this case, I have always
set up the impedances so that there is a short to ground at the output
frequency at the input, and a short at the input frequency at the
output. This is supposed to make the conversion effeciency higher, and
so get the output at a  higher level. Look out for stability and drive
level though. I battled that for 5 months on the last program I was
on. Of course, I was doing a quadrupler in a single stage at 1 Volt
Bias voltage, and I also has only about 1 mA to spend to do it. It's
working now, though.

Regards

Dave Bengtson
David Bengtson
Yes, these are my opinions
Looking for Old HP-41 Calculators and Accessories




From Unknown Wed Dec 27 18:28:55 1995
Path: news.epix.net!news.sprintlink.net!newsie.dmc.com!news.iii.net!news
From: "Thomas C. J. Sefranek" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Pls Help with Digital Display
Date: 22 Dec 1995 02:14:59 GMT
Organization: SRC
Lines: 7
Message-ID: <4bd4bm$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: wa1rhp.iii.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2N (Windows; I; 16bit)
To: [e-mail]

Hi Dr. John,
            If you get no better idea's, E-Mail me, we can design one!

Tom
WA1RHP




From Unknown Wed Dec 27 18:28:56 1995
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From: [e-mail] (wayne barnhart)
Newsgroups: rec.radio.amateur.homebrew
Subject: pre-amp
Date: 23 Dec 95 07:53:00 GMT
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Date: 21 Dec 1995 20:38:46 -0500
From: [e-mail]
Subject: pre-amp?

Could someone direct me to where I might find a schematic of a small pre-
amp I could build?


The Dec 95 issue of CQ illustraits the cascode preamp. Looked pretty easy
and with accessable parts.




Wayne Barnhart  WB7WHI                               Dirt is good!
Spokane, Wa.



From Unknown Wed Dec 27 18:28:56 1995
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: pre-amp?
Date: 21 Dec 1995 20:38:46 -0500
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Could someone direct me to where I might find a schematic of a small pre-
amp I could build? I run a two element quad beam,and tx is not a problem
I'd just like to pull in some distant stations more or less just to "sand
bag" on the frequency.If possible,a plan for an AC unit would be preferred
as I don't run a power supply.THANX
[e-mail]



From Unknown Wed Dec 27 18:28:57 1995
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Newsgroups: rec.radio.amateur.homebrew
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Carleton C. Ingerson)
From: [e-mail] (Carleton C. Ingerson)
Date: Tue, 26 Dec 1995 11:03:52 GMT
Subject: QST Automatic Tuner Article
Lines: 11

Hello there,

Would anyone be willing to copy and mail me the article from QST
concerning the automatic tuner?  I am not presently a member of
ARRL so therefore do not get QST. I am more than willing to pay
for copying and postage.  Plese send me e-mail if you would be
willing to do this for me.

73 de Carl N1DXM
[e-mail]




From Unknown Wed Dec 27 18:28:58 1995
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From: [e-mail] (Roland B. Burgan)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: RAMSEY kits - converting from battery - Problem.
Date: 27 Dec 1995 22:23:28 GMT
Organization: The Greater Detroit Free-Net
Lines: 5
Message-ID: <4bsh10$[e-mail]>
NNTP-Posting-Host: detroit.freenet.org


AC Power Supplys have a very low impedance compared to batterys.
Put a 22 ohm resistor in series with the power lead.  This is
especially true if using the LM286 audio chip.
--


From Unknown Wed Dec 27 18:28:59 1995
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From: [e-mail] (Peter L. Williamson)
Newsgroups: rec.radio.amateur.homebrew
Subject: S Parameters for BF960/BF981
Date: 25 Dec 95 21:04:55 GMT
Organization: ucsd usenet gateway
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Hello There from Australia.  Does anyone have a set of "S" Parameters for
the Philips/Siemens BF960 and BF981 dual gate fets.  I am interested in the
range 1 to 1000 MHz as I use them for IF amps and RF stages in my designs.
Thanks Peter L. Williamson VK4AWP.



From Unknown Wed Dec 27 18:29:01 1995
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From: [e-mail] (N1MM)
Newsgroups: rec.radio.amateur.homebrew
Subject: SB-220 Problems/Mods
Date: 26 Dec 1995 12:55:47 -0500
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I'm having trouble with my SB-221.  Once in a while on 10 meters, more
frequently if the CW/Tune - SSB switch is set to SSB, I get a loud pop.
When that happens, the .82 ohm resistor in the HV meter circuit blows and
I have to replace it.  One time the meter went with it.  It seems to be
much worse since I changed the amp over from a 15A, 115v line to a 20A,
220v line.   I presume because the "under-load" plate voltage is quite a
bit higher now.

I have heard that this problem is either VHF parasitics, or dirty
capacitors.  Has anyone in this group solved this problem?  Is there a FAQ
on this?

Also, what is the general concensus on directly grounding the SB-221's
grids?

Any help would be greatly apprciated.

Thanks.

Tom - N1MM


From Unknown Wed Dec 27 18:29:02 1995
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From: Barrie Britton <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: SB-220 Problems/Mods
Date: Tue, 26 Dec 1995 21:43:21 -0800
Organization: Loma Linda University Medical Center
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References: <4bpcv3$[e-mail]>
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In-Reply-To: <4bpcv3$[e-mail]>


On 26 Dec 1995, N1MM wrote:

> I'm having trouble with my SB-221.  Once in a while on 10 meters, more
> frequently if the CW/Tune - SSB switch is set to SSB, I get a loud pop.
> When that happens, the .82 ohm resistor in the HV meter circuit blows and
> I have to replace it.  One time the meter went with it.  It seems to be

What you describe is a VHF parasitic.  Send a SASE to Rich Measures, AG6K,
at 6455 La Cumbre Road, Somis, CA 93066 or call him at [phone].

Rich wrote several articles for QST describing the parasitic problem,
particularly in SB-200/221 amplifiers.  He sells very inexpensive (about
$15) parasitic suppressor kits for most amps.  Get his article reprints also,
and buy the other SB-220 mods such as the meter protection diodes, and the
lower heat bleeder resistors.

Good luck with this excellent amplifier.

    __{__       |
   /     \      |  Barrie G. Britton, K0WWG  ARRL Life Member
  |       |     |     Electronic Engineering Done Cheap
  |  (o)(o)     |            Your Place or Mine.
  @   .---_)    |
   | |  __|     |  Snail Mail: 5034 Rockledge Drive
   |  \__/      |              Riverside, California 92506
   /_____\      |
  /_____/ \     |  E-Mail    : [e-mail]
 /         \    |
    k0wwg       |  What one fool can do, another can.--S. P. Thompson


From Unknown Wed Dec 27 18:29:04 1995
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: SB-220 Problems/Mods
Date: 27 Dec 1995 06:10:00 -0500
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X-Newsreader: AOL Offline Reader

Hi Tony,
In article <4bpcv3$[e-mail]>, [e-mail] (N1MM) writes:

>I'm having trouble with my SB-221.  Once in a while on 10 meters, more
>frequently if the CW/Tune - SSB switch is set to SSB, I get a loud pop.

You could be loosing the tubes, or another component. Sometimes the RF
chokes arc through to the mounting screw, but usually its the tubes.

>When that happens, the .82 ohm resistor in the HV meter circuit blows and
>I have to replace it.  One time the meter went with it.

Put a diode protection circuit from the negative end of the electrolytics
to the chassis. The cathode of the diode (band end) goes towards the
electrolytics. Use two diodes in series and bypass them with a .1 uf 50
volt disc cap. It also doesn't hurt to add a 20 ohms 25 watt HIGH VOLTAGE
type resistor in series with the positive supply lead. The SB220-221 RF
choke has very low surge limiting resistance.

>much worse since I changed the amp over from a 15A, 115v line to a 20A,
>220v line.   I presume because the "under-load" plate voltage is quite a
>bit higher now.

The problem is likely peak voltage related.

>I have heard that this problem is either VHF parasitics, or dirty
>capacitors.  Has anyone in this group solved this problem?  Is there a
FAQ
>on this?

The parasitics thing is sort of a "fairy tale", the capacitor thing is
sometimes true, but the tubes are the most likely cause.

>Also, what is the general concensus on directly grounding the SB-221's
>grids?

That should be done if you can do it. That circuit was a design mistake.
It adds unwanted feedback and decreases the performance of the amp. By all
means, ground each grid pin directly to the chassis by drilling a hole
near EVERY grid pin and adding a lug. Remove the tubes first!

But the tubes may just be "gassing up". If so, they will arc once in a
while when plate voltage peaks are reached. Ten meters has the highest Q
and most touchy tuning, so it's more likely the PA peak anode voltages
reaches a few times the dc supply voltage there. When that happens, if the
tubes or some other component is "on the edge" and the peak voltage goes
past the safe point.....pop!

By the way, if the tubes are metal anode types, do you get the tubes red
once in a while to de-gas them?

73 Tom


From Unknown Wed Dec 27 18:29:05 1995
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From: [e-mail] (Wes Stewart)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: SB-220 Problems/Mods
Date: Wed, 27 Dec 1995 08:21:06 LOCAL
Organization: Arizona Daily Star - AZSTARNET
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In article <Pine.BSD/[e-mail]> Barrie B
ritton <[e-mail]> writes:
>From: Barrie Britton <[e-mail]>
>Subject: Re: SB-220 Problems/Mods
>Date: Tue, 26 Dec 1995 21:43:21 -0800


>On 26 Dec 1995, N1MM wrote:

>> I'm having trouble with my SB-221.  Once in a while on 10 meters, more
>> frequently if the CW/Tune - SSB switch is set to SSB, I get a loud pop.
>> When that happens, the .82 ohm resistor in the HV meter circuit blows and
>> I have to replace it.  One time the meter went with it.  It seems to be

>What you describe is a VHF parasitic.  Send a SASE to Rich Measures, AG6K,
>at 6455 La Cumbre Road, Somis, CA 93066 or call him at [phone].

>Rich wrote several articles for QST describing the parasitic problem,
>particularly in SB-200/221 amplifiers.  He sells very inexpensive (about
>$15) parasitic suppressor kits for most amps.  Get his article reprints also,
>and buy the other SB-220 mods such as the meter protection diodes, and the
>lower heat bleeder resistors.

Before you do this, locate the "Technical Correspondence" letters in QST
regarding these articles.  I don't have them at hand, but they were written by

a couple of knowledgeable people, including one from EIMAC.  They basically
debunk the articles.  Don't try to contact the EIMAC guy, however; I tried,
including a SASE and never got the courtesy of a reply :(

W8JI Tom has better advice.

>Good luck with this excellent amplifier.

73, Wes



From Unknown Wed Dec 27 18:29:06 1995
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From: [e-mail] (N1MM)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: SB-220 Problems/Mods
Date: 27 Dec 1995 14:42:59 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 8
Sender: [e-mail]
Message-ID: <4bs7k3$[e-mail]>
References: <Pine.BSD/[e-mail]>
Reply-To: [e-mail] (N1MM)
NNTP-Posting-Host: newsbf02.mail.aol.com

Thanks for the advice to both Barrie & Tom.  I have tried the AG6K
parisitic mods, and they did not seem to help.  I'll give the other advice
a try.  Anyone else have experience taming a '220?

Tom

P.S.  Thanks again.
Tom - N1MM


From Unknown Wed Dec 27 18:29:07 1995
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From: Sean McDonald <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Sound Blaster 16 as a DSP unit ?
Date: 27 Dec 1995 20:20:21 GMT
Organization: Internet Africa
Lines: 13
Message-ID: <4bs9q5$[e-mail]>
NNTP-Posting-Host: slipper119246.iafrica.com

Hi. I would like any information / programmes that about/use
the Creative Labs Sound Blaster 16 as a DSP unit, similar to
the MFJ-784 unit.

Does anyone have any information in this regard ?
Any programmes available ? Commercial / Shareware ?

I would appreciate any information on DSP.

Thanks, 73s

Sean McDonald, ZS5TM
email: [e-mail]


From Unknown Wed Dec 27 18:29:08 1995
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From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: SV818 need info
Date: Tue, 26 Dec 1995 13:06:22 -0800
Organization: Call America Internet Services  [phone]
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In the process of repairing some ham gear damaged by lightning, I came
across a Transitron zener diode SV818.  It was shorted so I do not have a
clue as to the zener voltage.  It appears to be a one watt unit.  Does
anyone have an old Transitron catalog?  ECG does not have a reference.
Many thanks...Cliff Buttschardt   W6HDO


From Unknown Wed Dec 27 18:29:09 1995
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (John Seboldt)
Subject: Re: Temperature Compensating Tuning Diodes
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
References: <[e-mail]>
Date: Sat, 23 Dec 1995 05:21:04 GMT
Lines: 25
Sender: [e-mail]

[e-mail] (Bob T.) writes:

>There was a brief thread discussing the scarcity of info on this topic
>here recently.

>Have found a pertinent Motorola Application Note AN-551 which specifically
>addresses temperature compensation techniques for tuning diodes.  The
>material should be available from local Motorola office or from the RF
>Device Data Book Volume II, Q4/88, DL110, Rev 3.

>Good Luck,
>Bob T.

Thank you, thank you!  I remembered somebody quoting from this document a
while back, reproducing schematics and all.

You can also get these notes faxed to you, free, at
http://motserv.indirect.com/home2/fax_rqst.html  -- just made a
successful request, now it's waiting for me at work :-)

: John Seboldt  [e-mail]  / CW:  It don't mean a thing
:      K0JD... Minneapolis, MN      /  if it ain't got that swing!
:   My R2/T2 stationdescribed in  / Di dah, di dah, di dah, di dah...
> http://www.lehigh.edu/lists/qrp-l/k0jd/index.html <



From Unknown Wed Dec 27 18:29:10 1995
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Transmitting loop near miss
Date: 22 Dec 1995 10:12:23 -0500
Organization: America Online, Inc. (1-800-827-6364)
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In article <4bd10k$[e-mail]>, [e-mail]
(GDentHouTX) writes:

>Ya'll
>     I'll publically display my ignorance and inquire as to the
prevailing
>opinion is that braid 1)IS or 2)IS NOT a good material to use for station
>grounding.  Seems to me that any energy that you would desire to be
>conducted directly to ground from a cabinet; chassis; grounding strip,
>etc. would be either DC (lightning hit?) or 60Hz (ground fault).  Is
there
>an additional desirablility to passing RF through such a connection that
>I'm missing or is braid bad only for radiating elements of antennas?
>Yours in ignorance,  Gerald
>[e-mail]

Hey Gerald,

Lightning behaves more like RF than dc, so braiding *stinks* for lightning
grounds.

Braiding is actually only good for very low frequency (power line or
audio) or dc grounds.

73 Tom


From Unknown Wed Dec 27 18:29:11 1995
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From: [e-mail] (Joe Landis - Systems & Network Mgr)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Transverter question
Message-ID: <[e-mail]>
Date: 20 Dec 95 09:51:43 EST
References: <[e-mail]>
Distribution: world
Organization: North American Drager - Telford, PA
Lines: 22

In article <[e-mail]>, pmb
[e-mail] writes:
>
> Just purchased inexpensive module to allow Icom 730 HF rig to emit low level

> RF signal for use with a transverter. Now am wondering where to go from here
.
> Are there inexpensive kits available that might get me 2m or 70cm SSB and CW
?
> Can anyone provide leads to a supplier? Anyone have any used offerings?
> Regards,
> Paul
> KB2TCG

Hi Paul,
Down East Microwave
Frenchtown, NJ
[phone]

Steve has good stuff for 50-10368mhz

See ya,
Joe - AA3GN
--
Joe Landis - Systems and Network Manager - North American Drager - Telford, PA
[e-mail]                        ..speaking only for myself, of course..


From Unknown Wed Dec 27 18:29:12 1995
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From: [e-mail] (Roger Stevens)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Transverter question
Date: 24 Dec 1995 18:15:00 GMT
Organization: Voicenet - Internet Access - [phone]
Lines: 44
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My version of Paul's question would be (and I always wondered why this wasn't
answered long ago) what would be the preferred configuration (as in a plug
and play solution) for running vhf/uhf fm, ssb, am/cw using, for example, my
Ranger 2950 10-meter transceiver?  There are so many of these out there,
someone must have an auto-sensing, auto-switching add-on transverter that
goes beyond the "get in the rig and cut it apart" stage.  I think I saw an ad
for a TOKYO 2-meter transverter a couple of years ago that claimed this kind
of capability.  Anyone know of such a "module" that does it all?

73, Roger WA3FLE
Norristown, PA

In article <[e-mail]>, [e-mail] says...
>
>In article <[e-mail]>,
pmbut
>[e-mail] writes:
>>
>> Just purchased inexpensive module to allow Icom 730 HF rig to emit low
level
>> RF signal for use with a transverter. Now am wondering where to go from
here.
>> Are there inexpensive kits available that might get me 2m or 70cm SSB and
CW?
>> Can anyone provide leads to a supplier? Anyone have any used offerings?
>> Regards,
>> Paul
>> KB2TCG
>
>Hi Paul,
>Down East Microwave
>Frenchtown, NJ
>[phone]
>
>Steve has good stuff for 50-10368mhz
>
>See ya,
>Joe - AA3GN
>--
>Joe Landis - Systems and Network Manager - North American Drager - Telford,
PA
>[e-mail]                        ..speaking only for myself, of
course..



From Unknown Wed Dec 27 18:29:14 1995
Path: news.epix.net!news.sprintlink.net!news.mindspring.com!usenet
From: [e-mail] (Pieter Ibelings)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: VHF MARS mod for IC-706
Date: 23 Dec 1995 21:35:35 GMT
Organization: -.-. --.-     -.. -..-
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Message-ID: <4bhsn7$[e-mail]>
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Xref: news.epix.net rec.radio.amateur.equipment:22990 rec.radio.amateur.homebrew:12354


>From: [e-mail]

>The additional items to in the Tech bullitain to restore out of two
>meter transmit are as follows (not endorsed or denied by icom USA):
>remove Diode #60 and cut the jumper next to it labled "W4".  Then
>remove either (Q38 or R353 resitor) on the main PCB (about one inch to
>right of Diode #60.  Then turn over the radio and cut a trace (You need
                                                ^^^^^^^^^^^^^^^^???
>picture of schematic to see clearly and install a jumper froM IC32 pin
>11 to the point where you cut the trace.  This will restore transmit
>from 135 to 175 MHZ.



I was looking at the information given in this mod and comparing it to the sch
ematic. This mod seems to be legit. The jumper labeled W4 on
the schematic appears to be the green 0 ohm resistor just to the rear of D59.
In the USA version removing D60 and removing W4 would be the
same thing.
I believe that removing D60 just prevents the radio from tx on aircraft band a
fter the VHF mod is performed. Removing Q38 or R353 would have
the same effect as cutting the yellow wire (J4). The receiver would work bette
r if the yellow wire is rerouted to the VCO switching
transistor. So all that is left is pin 11 of IC32. This pin is the same as the
  orange wire next to the famous yellow wire. All this wire
does is supply 5 Volts whenever the radio is outside the 0-60MHz range. This w
ire labeled L8 on the schematic is the one responsible for
enableing the 2 meter bandpass filters that are located in the PA unit. It als
o disables the high power amplifier which consists of a pair
of MRF 255 and is used in the HF and 6 meter bands. It appears to me that all
that is preventing the radio from txing outside the 144-148
range is a control pin. The PA unit appears to be fully enabled in the range 1
18-174. The control pin that disables the out of band TX must
be acting on one of the pre driver stages maybe IC1 or IC38. Now if we could f
ind this missing information about the control pin, all that
would be necessary would be to rewire it to the orange wire. This would enable
 it in all the range 118-174 MHz.

On the receive side, it appears like the 60MHzHP/129MHzLP filter that is selec
ted for receive anywhere outside the ham 2 meter band used to
be a (60-200) filter. This would explain why this filter would have been selec
ted the way it is in the unmodified version.

Now that I got a copy of the schematic I am making a list of things that I'm g
oing to change to the radio. I just wished that Icom would
have engineered the radio a little better. Although the radio is an outstandin
g attempt at a tribander all-mode radio, it could have been a
lot better.

73's
AC4OP
[e-mail]
http://www.mindspring.com/~wave






From Unknown Wed Dec 27 18:29:15 1995
Path: news.epix.net!uunet!in2.uu.net!tcsi.tcs.com!agate!holonet!colossus.holonet.net!minfox!tom.alldread
From: [e-mail] (Tom Alldread)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: VHF PLL design
Date: Sat, 23 Dec 1995 15:44:00 GMT
Message-ID: <[e-mail]>
Organization: MINFOX Courtenay, BC (604)-337-2023
Distribution: world
References: <[e-mail]>
Lines: 43


S>Recently I've seen several postings re PLL's, I designed one using a
 >TSA6057 PLL chip from PHILIPS controlled by a PIC micro.....Any body
 >interested?

S>From Steve Drury.     Email [e-mail]


Greetings Steve:

        I have written assembly code for the PIC 16C84 and have been
using a computer controlled DDS in some HF applications for a few years.
I would like to scale my DDS up to VHF using a modern PLL chip. I just
received a couple of PLLs from National that I would like to try.

        I am very interested in your design and have the following
questions:


        1) Please give a description of your VCO, low pass filter and
        availability of parts and cost.

        2) What is the frequency range?

        3) What is the step resolution?

        4) How fast does it lock up between steps?

        5) Does it use a pre-scaler and what is the reference
        frequency?

        6) Would you e-mail your PIC source code to me so I could study
        it?

        7) Are you using a keypad and lcd display?

        8) Which PIC are you utilizing?


73 de VE7TMA

---
 * QMPro 1.53 * Very Best Regards, [e-mail]


From Unknown Wed Dec 27 18:29:15 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!tank.news.pipex.net!pipex!demon!hamlab.demon.co.uk
From: [e-mail] (Steve Drury)
Newsgroups: rec.radio.amateur.homebrew
Subject: VHF PLL Home brew designs
Date: Fri, 22 Dec 1995 21:13:49 GMT
Lines: 7
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: hamlab.demon.co.uk
X-NNTP-Posting-Host: hamlab.demon.co.uk
X-Newsreader: Forte Free Agent v0.46

Recently I've seen several postings re PLL's, I designed one using a
TSA6057 PLL chip from PHILIPS controlled by a PIC micro.....Any body
interested?

From Steve Drury.     Email [e-mail]



From Unknown Wed Dec 27 18:29:17 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (SteveBragg)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: VHF PLL Home brew designs
Date: 27 Dec 1995 02:29:51 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 14
Sender: [e-mail]
Message-ID: <4bqslf$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail] (SteveBragg)
NNTP-Posting-Host: newsbf02.mail.aol.com

Steve,

I've designed a 1296 MHz PLL using the Phillips TSA5511.  What do you say
we swap designs ?  If you want it, E-mail me and I'll send you a .GIF file
with
my schematics & notes.  Please E-mail me your VHF PLL design.

Tnx,

Steve Bragg
KA9MVA
Stillwater, Oklahoma, USA

P.S. Yes, we HEARD the Oklahoma City Bomb (aprx 100 km away!)


From Unknown Wed Dec 27 18:29:17 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.compuserve.com!newsmaster
From: [e-mail] (Gerry Lawlor)
Newsgroups: rec.radio.amateur.homebrew
Subject: Want DSP advice
Date: Tue, 26 Dec 1995 21:44:53 GMT
Organization: CompuServe Incorporated
Lines: 14
Message-ID: <4bpqdi$[e-mail]>
NNTP-Posting-Host: ad50-016.compuserve.com
X-Newsreader: Forte Free Agent 1.0.82

Hello there
I am looking for information on DSP kits readily available for
assembly and installation.  My main application would be for
amtor/rtty application on HF but general audio clean up would be of
interest also e.g. SSB.  I will be adding it to either home brew or
very old commercial eqpt so a bit of hacking is not an impediment.
Any advice on suitable kits appreciated, particularly if they are
backed up by some decent applications software.

Thanks

Gerry  EI9FV
(Packet : EI9FV@EI7GM)



From Unknown Wed Dec 27 18:29:18 1995
Path: news.epix.net!news.sprintlink.net!news.onramp.net!newshost.cyberramp.net!uunet!in2.uu.net!newsfeed.internetmci.com!info.ucla.edu!psgrain!nntp.teleport.com!ip-vanc2-29
From: [e-mail] (John D. Rhodes)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WWVB Receiver?
Date: Sat, 23 Dec 95 18:58:48 GMT
Organization: Teleport - Portland's Public Access [phone]
Lines: 22
Message-ID: <4bhjl7$[e-mail]>
References: <495una$[e-mail]> <49j12i$[e-mail]> <4b4nla$[e-mail]> <4b4tdr$[e-mail]>
NNTP-Posting-Host: ip-vanc2-29.teleport.com
X-Newsreader: News Xpress Version 1.0 Beta #4

In article <4b4tdr$[e-mail]>,
   [e-mail] (Steve Muther) wrote:

>
>Getting a satellite receiver and using the direct network feed might be
>one idea.  Short term stability would be good, long term stability will
>be subject to daily satellite dirft in space.  You can get very good
>NBC reception from the Satcom K2 satellite with a 4ft. dish.  It would
>be interesting to compare its burst with a real standard.
>
>Steve Muther, WF6R
>[e-mail]
>
>

The GPS constellation has extremely accurate time information.  And the
propogation is _very_ predictable.


John D. Rhodes - AA7HL
Vancouver, WA
[e-mail]


From Unknown Wed Dec 27 18:29:20 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!news1.digital.com!nntp-hub2.barrnet.net!news.Stanford.EDU!w6yx.stanford.edu!stevem
From: [e-mail] (Steve Muther)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WWVB Receiver?
Date: 23 Dec 1995 20:45:20 GMT
Organization: Stanford Amateur Radio Club
Lines: 39
Message-ID: <4bhpp0$[e-mail]>
References: <4b4nla$[e-mail]> <4b4tdr$[e-mail]> <4bhjl7$[e-mail]>
NNTP-Posting-Host: w6yx.stanford.edu

In article <4bhjl7$[e-mail]> [e-mail] (John D. Rho
des) writes:
>In article <4b4tdr$[e-mail]>,
>   [e-mail] (Steve Muther) wrote:
>
>>
>>Getting a satellite receiver and using the direct network feed might be
>>one idea.  Short term stability would be good, long term stability will
>>be subject to daily satellite dirft in space.  You can get very good
>>NBC reception from the Satcom K2 satellite with a 4ft. dish.  It would
>>be interesting to compare its burst with a real standard.
>>
>>Steve Muther, WF6R
>>[e-mail]
>>
>>
>
>The GPS constellation has extremely accurate time information.  And the
>propogation is _very_ predictable.
>
>
>John D. Rhodes - AA7HL
>Vancouver, WA
>[e-mail]

I am actually looking for a commercially made gps time and frequency
standard to distribute around the company I work for to keep counters
generators etc. on a common standard.

I only suggested using video network feeds because there are many
Ham type frequency counters etc. that use 3.58MHz crystals as the
time base. I see video genlock boxes which will lock an oscillator
to a color burst from an external source running for about $10 at
fleamarkets.  It is a far more cost effective approach for a hobby
bench than a GPS system.

Steve Muther WF6R





From Unknown Wed Dec 27 18:29:21 1995
Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!uwm.edu!lll-winken.llnl.gov!enews.sgi.com!decwrl!pagesat.net!calweb!usenet
From: Bill Janssen <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WWVB Receiver?
Date: 24 Dec 1995 19:57:09 GMT
Organization: CalWeb Internet Services, Inc.
Lines: 18
Message-ID: <4bkbal$[e-mail]>
References: <4b4nla$[e-mail]> <4b4tdr$[e-mail]> <4bhjl7$[e-mail]> <4bhpp0$[e-mail]>
NNTP-Posting-Host: sac1-10.calweb.com

[e-mail] (Steve Muther) wrote:
>
> In article <4bhjl7$[e-mail]
>
> I am actually looking for a commercially made gps time and frequency
> standard to distribute around the company I work for to keep counters
> generators etc. on a common standard.
>
>
>
Two companies that come to mind for this kind of equipment are;

    Austron located in Austin TX

    Spetracom located in Rochester NY

I don't have more info at hand but it is available if you want
[e-mail]


From Unknown Mon Jan 01 01:09:37 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!ns2.spyder.net!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: QST IMP
Date: 24 Dec 1995 20:23:51 GMT
Organization: SpyderByte Communications, Inc.
Lines: 4
Message-ID: <4bkcsn$[e-mail]>
NNTP-Posting-Host: gboro67.spyder.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1PE (Windows; I; 16bit)

Has anyone built the IMP 1200 baud modem in the newest QST magazine?
Any problems or suggestions?
Thanks...



From Unknown Mon Jan 01 01:09:38 1996
Path: news.epix.net!uunet!in2.uu.net!feenix.metronet.com!news.ecn.bgu.edu!vixen.cso.uiuc.edu!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!agate!library.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (richard smith)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ham-Homebrew Digest V95 #459
Date: 26 Dec 95 04:59:39 GMT
Organization: ucsd usenet gateway
Lines: 1
Message-ID: <Pine.SUN.3.91.951225235915.14151C-100000@scfn>
References: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

unsubscribe


From Unknown Mon Jan 01 01:09:39 1996
Path: news.epix.net!uunet!in1.uu.net!tank.news.pipex.net!pipex!demon!mail2news.demon.co.uk!lfheller.demon.co.uk
From: Leon Heller <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Crystal Filters for Ham in Ukraine
Date: Wed, 27 Dec 95 10:25:54 GMT
Organization: Home
Lines: 20
Message-ID: <[e-mail]>
References: <4bpmuu$[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: lfheller.demon.co.uk
X-Newsreader: Demon Internet Simple News v1.29
X-Mail2News-Path: relay-4.mail.demon.net!post.demon.co.uk!lfheller.demon.co.uk

In article <4bpmuu$[e-mail]>
           [e-mail] "Max Kelson" writes:

> I have a friend in the Ukraine (uu0jn) who has a homemade HF
> transceiver who is having a problem finding crystal filters.
> Can someone tell me where I can find these?
>
> I would be interested in buying new or used or in alternative
> methods of solving the problem.  Also, any references for
> making a "home brew" filter might be very helpful.

Xtal ladder filters are quite easy to design and build. W1FB's Design
Notebook (ARRL) has lots of info.

Leon
--
Leon Heller, G1HSM                | "Do not adjust your mind, there is
E-mail [e-mail]  |  a fault in reality": on a wall
Phone: [phone]         |  many years ago in Oxford.


From Unknown Mon Jan 01 01:09:40 1996
Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!EU.net!peer-news.britain.eu.net!tank.news.pipex.net!pipex!demon!mail2news.demon.co.uk!lfheller.demon.co.uk
From: Leon Heller <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Want DSP advice
Date: Wed, 27 Dec 95 10:34:20 GMT
Organization: Home
Lines: 25
Message-ID: <[e-mail]>
References: <4bpqdi$[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: lfheller.demon.co.uk
X-Newsreader: Demon Internet Simple News v1.29
X-Mail2News-Path: relay-4.mail.demon.net!post.demon.co.uk!lfheller.demon.co.uk

In article <4bpqdi$[e-mail]>
           [e-mail] "Gerry Lawlor" writes:

> Hello there
> I am looking for information on DSP kits readily available for
> assembly and installation.  My main application would be for
> amtor/rtty application on HF but general audio clean up would be of
> interest also e.g. SSB.  I will be adding it to either home brew or
> very old commercial eqpt so a bit of hacking is not an impediment.
> Any advice on suitable kits appreciated, particularly if they are
> backed up by some decent applications software.

I've got the Analog Devices EZ-KIT Lite, which sells for 65 UK Pounds.
It uses the ADSP-2181, which is compatible with the ADSP-2115 used on
the PSA sound cards, for which there is a lot of amateur software
around; it won't be long before this software has been ported to the
EZ-KIT. It's not really a kit, as it comes as an assembled board,
together with development software. It interfaces to a PC serial port.

Leon
--
Leon Heller, G1HSM                | "Do not adjust your mind, there is
E-mail [e-mail]  |  a fault in reality": on a wall
Phone: [phone]         |  many years ago in Oxford.


From Unknown Mon Jan 01 01:09:41 1996
Path: news.epix.net!uunet!in1.uu.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!bug.rahul.net!a2i!kaiwan.kaiwan.com!not-for-mail
From: [e-mail] (Alfred Lee)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Amateur-band distance measurement (radar, etc.)
Date: 27 Dec 1995 12:53:14 -0800
Organization: KAIWAN Internet (310-527-4279,818-756-0180,909-785-9712,714-638-4133,805-294-9338)
Lines: 35
Sender: [e-mail]
Message-ID: <[e-mail]>
References: <4bqslt$[e-mail]>
NNTP-Posting-Host: kaiwan009.kaiwan.com

In article <4bqslt$[e-mail]>,
[e-mail] (SteveBragg) wrote:
> I am a radio amateur experimenting with distance/velocity/acceleration
> measurement using a digital-code transit-time method.  I have had some
> limited success, using a direct-FSK system with 223 MHz uplink and
> 1300 MHz downlink.  If you're interested, the SPECS are below.   If not,
> see the
> PLEA below.
>

deleted

>
> ... and anything else you think I should know.  E-Mail me if you want more
> details about my system.  I think hams should share successes (and
> failures!)
>

I totally agree with you that hams should share.  But I disagree with
the E-Mail part; POST IT IN THE NEWSGROUP.


> 73,
> Steve Bragg KA9MVA
> Stillwater, Oklahoma
> [e-mail]

Happy New Year.

73,


---
Alfred Lee                                                       [e-mail]
m
KE6KGV           'The answer is (e^iπ + 1) ? "No" : "Yes"'


From Unknown Mon Jan 01 01:09:42 1996
Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!usenet
From: "C. J. Hawley Jr." <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: SB-220 Problems/Mods
Date: Wed, 27 Dec 1995 14:16:05 -0600
Organization: University of Illinois, Urbana-Champaign
Lines: 27
Message-ID: <[e-mail]>
References: <4bpcv3$[e-mail]> <4br9i8$[e-mail]>
NNTP-Posting-Host: canberra-6.slip.uiuc.edu
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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X-Mailer: Mozilla 2.0b3 (Win95; I)

W8JI Tom wrote:

snip:

> By the way, if the tubes are metal anode types, do you get the tubes red
> once in a while to de-gas them?

What happens here to the gasses? Do they change chemically and become attached
 to
something? Something like the getter? How did that work? Wasn't it Magnesium o
r
some such which was vaporized inside the tube and chemically or mechanically
bonded or absorbed the gas and stuck somewhere? If the plates are made hot, th
en
this would work against the getter residue, so they must not use getters in
transmitting tubes? But, the plates would absorb gases if they are made out of

Tantalum (and what other materials?) and became very hot. I read that (Terman)

Zirconium will absorb Hydrogen up to 350C but will give it back above that. Th
en
if you have Zirconium also at 1400C it will greatly absorb other gasses. They
can
put two Zirconium filaments in at these two temps to clean up continuously. Wh
at
does Eimac make.....say the 3-500 plates out of and if there are hydrogen and
other gasses inside the tube over time then what is the analysis if you raise
the
tube plate to cherry red. All hydrogen? Is that better or worse than never goi
ng
above 350C? Is that impossible in a transmitting tube? How hot is just below a
ny
color change? I suppose Eimac has studied this?

Sorry....just triggered my interest, cause it sounded like a well known fact t
hat
I am ignorant of.

Chuck, KE9UW


From Unknown Mon Jan 01 01:09:43 1996
Path: news.epix.net!news.sprintlink.net!news.clark.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!usenet.kornet.nm.kr!agate!sunsite.doc.ic.ac.uk!uknet!news.u-net.com!newsmaster
From: [e-mail] (Mike Stirling)
Newsgroups: rec.radio.amateur.homebrew
Subject: 10 metre band antenna
Date: Wed, 27 Dec 1995 14:43:42 GMT
Organization: Mr. T. Stirling
Lines: 6
Message-ID: <4brm90$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: tandm.u-net.com
X-Newsreader: Forte Free Agent v0.55

Does anyone have any designs for a small antenna for use on the 10
metre band (Rx and Tx). The antenna would need to be only a few feet
long for mounting in the loft.





From Unknown Mon Jan 01 01:09:44 1996
Path: news.epix.net!uunet!in1.uu.net!EU.net!peer-news.britain.eu.net!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: Atlas 210X power output Question
Date: Wed, 27 Dec 95 15:51:54 GMT
Lines: 12
Message-ID: <[e-mail]>
References: <4bsigj$[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4
Xref: news.epix.net rec.radio.amateur.equipment:23255 rec.radio.amateur.homebrew:12473

   "Michael G. Reiney" <[e-mail]> wrote:

>I have an Atlas 210X that works fine on 40 meters and up.  On
>75 meters, I can only get about 40W out of it.

That could be many things besides the final amplifier circuitry.
Have you looked at the RF amplitude feeding the drivers or PA?

73,
Jack  WB3U



From Unknown Mon Jan 01 01:09:46 1996
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!usenet.hana.nm.kr!usenet.seri.re.kr!news.kreonet.re.kr!news.dacom.co.kr!news.netins.net!newsrelay.netins.net!solaris.cc.vt.edu!news.duke.edu!zombie.ncsc.mil!nntp.coast.net!news.kei.com!newsfeed.internetmci.com!howland.reston.ans.net!math.ohio-state.edu!newsfeed.acns.nwu.edu!uicvm.uic.edu!u40241
Organization: University of Illinois at Chicago, ADN Computer Center
Date: Wed, 27 Dec 1995 16:46:11 CST
From: <[e-mail]>
Message-ID: <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: amidon associates ' fax number
References: <4brvf1$[e-mail]>
Lines: 5

For reference, Amidon, Inc. > P.O. Box 25867,Santa Ana, CA. 92799.
Vox:  714-850.4660  &    Fax:  [phone].
They are selling "over 9 types of UNUNs" UNbalenced to UNbalenced Transformer.
This looks like it could be useful for off-beat or unusual antenna designs.
Of course, they are otherwise the Iron-Powder and Ferrite coil-form people.
 K9ZAT


From Unknown Mon Jan 01 01:09:47 1996
Path: news.epix.net!news.sprintlink.net!EU.net!Germany.EU.net!zib-berlin.de!unlisys!newsun.netmbx.de!netmbx.netmbx.de!gerhard
From: [e-mail] (Gerhard Hoffmann)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Crystal Filters for Ham in Ukraine
Date: 27 Dec 1995 23:04:45 GMT
Organization: netmbx GbR, Berlin, Germany
Lines: 27
Message-ID: <4bsjed$[e-mail]>
References: <4bpmuu$[e-mail]> <4br037$[e-mail]>
NNTP-Posting-Host: netmbx2.netmbx.de

In article <4br037$[e-mail]>,
Wanda M Desmond  <[e-mail]> wrote:
>In <4bpmuu$[e-mail]> [e-mail] (Max
>Kelson) writes:
>>methods of solving the problem.  Also, any references for
>>making a "home brew" filter might be very helpful.
>>
>
>The '95 and '96 ARRL Handbooks have schematics for crystal filters.

Jacob Makhinson, N6NWP:
Designing & Building High-Performance Crystal Ladder Filters
QEX, Jan. 95,  15 pages


There was another good article in the german "Funktelegramm" in 1995
I cannot find it right now but if you are interested i'll look for it.

73,  Gerhard



--
#  Gerhard Hoffmann            #     phone: [phone]     #
#  Gleditschstr. 79            #     fax:   [phone]     #
#  D10823 Berlin               #     on the air:  dk4xp            #
#  Germany                     #     in the air:  d-1441, d-kick   #


From Unknown Mon Jan 01 01:09:48 1996
Path: news.epix.net!uunet!in2.uu.net!mr.net!news.mr.net!wavefront.com!usenet
From: C Jefferson <cjeffers@204.248.112.2>
Newsgroups: rec.radio.amateur.homebrew
Subject: 144MHz Crystal Receiver
Date: 27 Dec 1995 23:06:59 GMT
Organization: WaveFront Communications, Inc.
Lines: 6
Message-ID: <4bsjij$[e-mail]>
NNTP-Posting-Host: lumts-1-07.luminet.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2 (Windows; U; 16bit)

I'm looking for a crystal controlled 2-meter receiver that would be
fairly cheap. I'm going to use it for a permant repeater monitor. If
anybody has anything of the sort send a reply please. Thank you very much
73's from KB0THN.
(:)=)



From Unknown Mon Jan 01 01:09:49 1996
Path: news.epix.net!news.sprintlink.net!EU.net!Germany.EU.net!zib-berlin.de!unlisys!newsun.netmbx.de!netmbx.netmbx.de!gerhard
From: [e-mail] (Gerhard Hoffmann)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DC Rcvr w/DSP backend
Date: 27 Dec 1995 23:14:26 GMT
Organization: netmbx GbR, Berlin, Germany
Lines: 32
Message-ID: <4bsk0i$[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]> <4brm1t$[e-mail]>
NNTP-Posting-Host: netmbx2.netmbx.de

In article <4brm1t$[e-mail]>, Zack Lau  <[e-mail]> wrote:
>
(somebody else:)
>>> However, you ought to be able to use DSP to
>>> combine multiple bit steams seamlessly.  Suppose
>>> you had four 16 bit A/D converters with different
>>> amounts of gain ahead of them.  Properly done, this
>>> ought to extend the single tone dynamic range of
>>> the system considerably.

>One bit stream handles -140 to -60 dBm
>another bit stream handles -120 to -40 dBm
>another handles -100 to -20 dBm
>the last handles -80 to 0 dBm
>You can switch to less sensitive bit streams as the signals get
>louder.
>
>Thus, the system ought to handle signals from -140 dBm through
>0 dBm without overloading. Of course, loud signals will prevent
>you from hearing weaker signals simultaneously.

But that's what dynamic range is all about. The above setup
is exactly equivalent to one 16 Bit ADC plus 3 attenuators/AGC.

Gerhard


--
#  Gerhard Hoffmann            #     phone: [phone]     #
#  Gleditschstr. 79            #     fax:   [phone]     #
#  D10823 Berlin               #     on the air:  dk4xp            #
#  Germany                     #     in the air:  d-1441, d-kick   #


From Unknown Mon Jan 01 01:09:50 1996
Path: news.epix.net!uunet!in1.uu.net!huey.cadvision.com!usenet
From: "I.M. (\"Irv\") Finkleman" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ALC ??
Date: 28 Dec 1995 00:14:25 GMT
Organization: CADVision
Lines: 12
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References: <4ba9i4$[e-mail]>
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I Don't see any reason why your choice should not work.  It certainly
would not take long to install and test it ... the only problem I can
think of would be if the output of the circuit was too large a voltage
for the controlled circuit. Should this occur, all you have to do is put
in a resistive voltage divider. Almopst any old pot should do the trick
since the feedback circuit is basically a low voltage very low current
arrangement. Go for it .... if you have problems Get back to me .. I'll
be glad to help.


                                Irv VE6BP



From Unknown Mon Jan 01 01:09:50 1996
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From: [e-mail] (Allan Moyse)
Newsgroups: rec.radio.amateur.homebrew
Subject: I need help\advice on homebrew device
Date: 28 Dec 1995 01:59:27 GMT
Organization: Prodigy Services Company  1-800-PRODIGY
Lines: 12
Distribution: world
Message-ID: <4bstlv$[e-mail]>
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I am looking for a kit or device or circuit which can be built into a
desk microphone that will send the letter "K" when the PTT button is
released.  This would signify that you are now ready to receive.  If
anybody has any Ideas, please let me know.
        Brian

Please reply via E-Mail







From Unknown Mon Jan 01 01:09:51 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!nntp.crl.com!decwrl!csus.edu!csusac!zimmer!waldorf.csc.calpoly.edu!isnews.csc.calpoly.edu!farad.elee.calpoly.edu!ceustaqu
From: Cal Eustaquio <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Wanted: Info on SB and AM sync det chips
Date: Thu, 28 Dec 1995 02:41:45 -0800
Organization: Cal Poly, San Luis Obispo
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Anyone have information on chips that I can use to build a combination
sideband adaptor and AM synchronous detector? Any help on this matter
will be greatly appreciated. Cal, N6KYR.


From Unknown Mon Jan 01 01:09:53 1996
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From: [e-mail] (Scanner119)
Newsgroups: rec.radio.amateur.homebrew
Subject: 2 Channel Maxtrac to 16 Channel Maxtrac Conversion?????
Date: 28 Dec 1995 02:42:13 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 17
Sender: [e-mail]
Message-ID: <4bthol$[e-mail]>
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NNTP-Posting-Host: newsbf02.mail.aol.com

I saw a posting on here the other day on converting a 2 channel Motorola
Maxtrac(VHF High Band) to a 16 channel.  I have access to both the
software and hardware I need some technical advice on how to do it.  I
have
4 mobiles and 1 base station I use for my construction company and would
like to convert them to 16 channel radios.  I priced out new radios from a
local guy and he wants $425 a pop for 16 channel ones(used, no less) and I
spoke to a friend who says the hardware is only about $25 for each radio
so I
figured this was the way to go.  I really could use some help from you
guys.
I'm really not a radio-guy, I'm a scanner-guy myself.  Any help would be
greatly appreciated.  Thanx in advance.

Scott
[e-mail]
[e-mail]


From Unknown Mon Jan 01 01:09:54 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (wayne barnhart)
Newsgroups: rec.radio.amateur.homebrew
Subject: 2 stage amps
Date: 28 Dec 95 03:44:00 GMT
Organization: ucsd usenet gateway
Lines: 30
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

When building a 2 stage transistor audio amp how do you keep the first stage
from overdriving the final? I have been running simulations on workbench and
it says that if I try to do this I be gett'n a big case of the ugly's. I
tried and it was right...well it could of been wrong.

I have been experimenting with 2n2222's and I suspect that it must be the
way the final is biased as compaired with the bias of the driver but I have
no lititure around here as to how to set it up.

I have no trouble designing single transistor audio amplifiers (class A
mostly) but it never occured to me that there would be a problem tieing two
of them together (RC coupleing). Only wanted a few watts out but beginning
to suspect that I need another type of transistor for the final, one that is
capable of handling the input from the driver.

Yes, I know I can stick an opamp in there and be done with the whole thing
but this is supposed to be a learning experience. :)

What I eventually want to do is slightly modify the HW-8 for speaker output.
It currently is using an MPS A-20 transistor (what ever that is) for audio
out into headphones. Was wondering if the A-20 would serve as a driver for a
second stage?

God I get windy...I go away now.



Wayne Barnhart  WB7WHI                               Dirt is good!
Spokane, Wa.



From Unknown Mon Jan 01 01:09:55 1996
Path: news.epix.net!news.sprintlink.net!news.rain.org!leigh
From: [e-mail] (Leigh)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: Atlas 210X power output Question
Followup-To: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Date: 28 Dec 1995 05:48:49 GMT
Organization: RAIN Public Access Internet (805) 967-RAIN
Lines: 16
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Xref: news.epix.net rec.radio.amateur.equipment:23166 rec.radio.amateur.homebrew:12410


I've found my Atlas 210 to be EXTREMELY SWR sensistive, so you might take
a closer look at your 75 meter antenna.

I sometimes do 40 meter mobile with a Hustler 40 meter coil and a SWR
around 1:1.5.  My Icom 735 will put its full 100 watts into this antenna,
but the Atlas 210 will drop to QRP levels, unless I have a tuner inline,
then I get full power out.

Even though it is a little drifty on warm-up, has no CW sidetone and
awkward CW TX/RX switching, I like my little old Atlas 210.  I bought it
from a newer ham for a mere 50 bucks, one of the best radio deals I've
stumbled upon.

73.  --Leigh/KM6JE.



From Unknown Mon Jan 01 01:09:56 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!news.iii.net!news
From: "Thomas C. J. Sefranek" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 2 stage amps
Date: 28 Dec 1995 14:17:36 GMT
Organization: SRC
Lines: 9
Message-ID: <4bu8uj$[e-mail]>
References: <[e-mail]>
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Wayne,
      Perhaps your second (Power) stage should be an emitter follower.
What you need is POWER not voltage gain.

And yes, do plan on a bigger transistor.

Tom




From Unknown Mon Jan 01 01:09:57 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!miwok!bdt.com!news.ossi.com!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news
From: Zack Lau <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DC Rcvr w/DSP backend
Date: 28 Dec 1995 14:33:50 GMT
Organization: American Radio Relay League
Lines: 25
Message-ID: <4bu9se$[e-mail]>
References: <4brm1t$[e-mail]> <4bsdp7$[e-mail]>
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[e-mail] (Tom Bruhns) wrote:

>Except for a very small advantage in the ability to switch quickly
>and with minimum transient, this should be no different than
>switching gain ahead of the ADC.  Unless you have money to toss at
>ADCs, it seems like the switched gain (or just controlled gain) would
>be a more reasonable way in the typical ham application to do it.

I admit I have a weird viewpoint on this.  To me, the minimum
transient allows me to hear just a little bit more--a distinct
advantage in competitive pursuits such as pileups and contests.
Particularly from a 2nd floor apartment, where you are first
first or somewhere at the bottom of the pile.

Like the extra dB of gain from a bigger beam or better feedlines,
the extra expense is hardly worthwhile for talking to someone
who is ridiculously loud all the time.

Actually, if you are just interested in weak stations, one
alternative is to just clip out the strong signals.  On the
other hand, you are now tossing out information that might
be useful.

Zack KH6CP/1  [e-mail]



From Unknown Mon Jan 01 01:09:58 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Jim Stafford-W4QO)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Crystal Sets
Date: 28 Dec 95 17:54:11 GMT
Organization: ucsd usenet gateway
Lines: 8
Message-ID: <Pine.SV4.3.91.951228125150.13991D-100000@atl1>
References: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

For those who may not have the catalog, Antique Radio Supply out of
Tempe, AZ has quite a few books on Crystal Sets including one like called
Radios That Work For Free.  It is $8.50 and about 140 pages.  There are
many more in the ARS catalog which you can get by calling 602-820-5411.
Good luck.

73/72/jim/w4qo



From Unknown Mon Jan 01 01:09:59 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netcom.com!tgm
From: [e-mail] (Thomas G. McWilliams)
Subject: Re: 144MHz Crystal Receiver
Message-ID: <[e-mail]>
Organization: Jot-Em Down Store and Library
X-Newsreader: TIN [version 1.2 PL1]
References: <4bsjij$[e-mail]>
Date: Thu, 28 Dec 1995 18:53:21 GMT
Lines: 15
Sender: [e-mail]

C Jefferson (cjeffers@204.248.112.2) wrote:
: I'm looking for a crystal controlled 2-meter receiver that would be
: fairly cheap. I'm going to use it for a permant repeater monitor. If
: anybody has anything of the sort send a reply please. Thank you very much
: 73's from KB0THN.

Try finding one of those cheap weather radios that RadioShack sells
or used to sell. Replace the crystal, and tweak the coils. I think
the weather frequencies are around 160 Mhz.

Actually, I've seen basic VHF/UHF scanner radios for under $100. That
would be a bit easier, all things considered.

Thomas
ars KI4N


From Unknown Mon Jan 01 01:09:59 1996
Path: news.epix.net!news.sprintlink.net!oronet!news
From: [e-mail] (Jim Weir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: VHF PLL Home brew designs
Date: Thu, 28 Dec 1995 19:19:53 GMT
Organization: RST Engineering
Lines: 22
Message-ID: <4buqkd$[e-mail]>
References: <[e-mail]> <4bqslf$[e-mail]>
NNTP-Posting-Host: rst-engr.oro.net
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (SteveBragg) wrote:

>Steve,

>I've designed a 1296 MHz PLL using the Phillips TSA5511.  What do you say
>we swap designs ?
Sorry, fellers, the only thing I've got to swap is an old parallel
thumbwheel switch design using the Motorola MC145152 but I'd love to
get the files you guys have on the newer stuff.

Any posts would be appreciated.

Jim



Jim Weir VP Engineering  | "We seem to be standing on
RST Engineering          |  the foreskin of technology."
Grass Valley CA 95945    | (Gen. Chuck Yeager)
voice/fax [phone]   |
[e-mail]  AR Adv WB6BHI  CFI A&G/Comml Inst A&G/A&P/C-182A N73CQ



From Unknown Mon Jan 01 01:10:01 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!frankensun.altair.com!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb
From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DC Rcvr w/DSP backend
Date: 28 Dec 1995 19:32:04 GMT
Organization: Hewlett Packard Corvallis Site
Lines: 37
Message-ID: <4burbk$[e-mail]>
References: <4bsk0i$[e-mail]>
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Gerhard Hoffmann ([e-mail]) wrote:
(Zack's scheme for multiple ADCs fed by different
attenuations of the input signal deleted...)

: But that's what dynamic range is all about. The above setup
: is exactly equivalent to one 16 Bit ADC plus 3 attenuators/AGC.

No, it's not _exactly_ the same.  It's close, but there is always
at least 1 sample delay between the attenuators and the signal
processor connected to the ADC, and if the ADC is a delta-sigma
(an economical choice these days), the delay can be more than
30 samples.  So, if you have to switch attenuators, the horse has
escaped from the barn before you have closed the door, so to speak
(write?).  You end up with a period of some number of samples
where the ADC may be overloaded, because you didn't switch the
attenuator soon enough.  (BTW, be sure to let a delta-sigma
recover long enough from an overload...)

But I'm still of the opinion that a decent 20-bit converter will
not be the limiting factor in an HF DC receiver signal path:  the
mixer stage is most likely going to be the place where the largest
distortion products are generated, and if you set the gain such
that the 20 bit converter full scale is something like 0.5 volts at
the RF input, then in the HF bands at least I'd expect the RF noise
floor to be greater than the ADC noise floor, just from noise
received by the antenna.  Maybe Zack has to deal with in-band
RF levels above 0.5 volts, but so far at least, I don't.  And again,
I'd have to start worrying about the mixer dying at about that level
anyway.  In summary, I think that using a decent 20 bit ADC with
proper level scaling in a DC receiver will give you performance good
enough that you will have to start looking at things other than the
ADC if you want further improvement.

--
Cheers,
Tom
[e-mail]


From Unknown Mon Jan 01 01:10:02 1996
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!tank.news.pipex.net!pipex!demon!hamlab.demon.co.uk
From: [e-mail] (Steve Drury)
Newsgroups: rec.radio.amateur.homebrew
Subject: VHF PLL Home brew design..WORD 2.0 DOC - pll_info.zip (0/1)
Date: Thu, 28 Dec 1995 20:37:01 GMT
Lines: 6
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: hamlab.demon.co.uk
X-NNTP-Posting-Host: hamlab.demon.co.uk
X-Newsreader: Forte Free Agent v0.46

I've tried to Email to several individuals the attatched file without
success, so everyone can benefit from it now.
From Steve Drury.     Email [e-mail]
G6ALU Milton Keynes England



From Unknown Mon Jan 01 01:10:03 1996
Path: news.epix.net!news.sprintlink.net!news.telalink.net!SANDH.COM
From: [e-mail] (Jeffrey Yuan)
Newsgroups: rec.radio.amateur.homebrew
Subject: Rick Campbell's T2 Module Kit For Sale
Date: 28 Dec 95 21:05:04
Organization: Telalink Corporation, Nashville, TN, USA
Lines: 37
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Path: news.telalink.net!SANDH.COM
From: [e-mail] (Jeffrey Yuan)
Newsgroups: rec.radio.amateur.homebrew
Subject: Rick Campbell's T2 Module Kit For Sale
Date: 28 Dec 95 21:05:04
Organization: Telalink Corporation, Nashville, TN, USA
Lines:
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Path: news.telalink.net!news.sprintlink.net!usenet.kornet.nm.kr!news.kreonet.r
e.kr!usenet.seri.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!in2.uu.net!si
emens!princeton!cnn.Princeton.EDU!usenet
From: Jeffrey Yuan <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Rick Campbell's T2 Module Kit For Sale
Date: Thu, 28 Dec 1995 22:05:04 -0500
Organization: Princeton University
Lines: 19
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I have an unassembled complete T2 Module kit for sale.  This is the
kit that Kanga has put together.  It is complete, unopened with all
the parts and PC board.  If you are unfamiliar with this kit, it is
a multimode phasing exciter that was written up in the April 1993
QST.  I am asking $60 for it and it includes COD shipping.  Email
[e-mail] or call 609-924-7611 and leave a message
for Jeff.

Jeffrey Yuan
N2NXC


From Unknown Mon Jan 01 01:10:04 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.third-wave.com!usenet
From: Gary Robison <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Making PC boards from laser printer
Date: 28 Dec 1995 21:24:08 GMT
Organization: Third Wave Development
Lines: 9
Message-ID: <4bv1to$[e-mail]>
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The PCB must be SUPER clean I had the same trouble....do not clean it
with steel wool , it looks good but it leaves little shards of copper and
steel sticking up and the transfer will not lay flat on the board
use a light (white colored) scotch brite by its self (no clenser ie
comet) the clenser will put little ruts (scratches) all over and the
transfer will not conform to the bottom of these.

good luck.........Gary K3SJX



From Unknown Mon Jan 01 01:10:05 1996
Path: news.epix.net!news.sprintlink.net!news.telalink.net!SANDH.COM
From: [e-mail] (William Kresl)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 144MHz Crystal Receiver
Date: 29 Dec 95 00:30:22
Organization: Telalink Corporation, Nashville, TN, USA
Lines: 36
Message-ID: <[e-mail]>
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Path: news.telalink.net!SANDH.COM
From: [e-mail] (William Kresl)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 144MHz Crystal Receiver
Date: 29 Dec 95 00:30:22
Organization: Telalink Corporation, Nashville, TN, USA
Lines:
Message-ID: <[e-mail]>
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Path: news.telalink.net!news.sprintlink.net!newsfeed.internetmci.com!cdc2.cdc.
net!news1.cris.com!news
From: William Kresl <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 144MHz Crystal Receiver
Date: 29 Dec 1995 06:30:22 GMT
Organization: Concentric Internet Services
Lines: 18
Message-ID: <4c01tu$[e-mail]>
References: <4bsjij$[e-mail]>
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To: cjeffers@204.248.112.2

Motorola MC33142 and similar series along with
SIGNETICS TDA7000 (I think, was sold at RADIO
SHACK) will work fine...73

Bill-WB9BBC @KD9JK.WI.USA.NOAM




From Unknown Mon Jan 01 01:10:06 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!tank.news.pipex.net!pipex!peer-news.britain.eu.net!yama.mcc.ac.uk!io.salford.ac.uk!aber!bath.ac.uk!bell.ukonline.co.uk!morse.ukonline.co.uk!ukonline.co.uk!david.j2
From: David Johnson <[e-mail]>
Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: Help with Icom 720A on Amtor A.
Date: Fri, 29 Dec 1995 01:13:10 +0000
Organization: (NON)
Lines: 21
Distribution: world
Message-ID: <[e-mail]>
References: <4bshcn$[e-mail]>
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Xref: news.epix.net rec.radio.amateur.digital.misc:13413 rec.radio.amateur.equipment:23252 rec.radio.amateur.homebrew:12471

In article <4bshcn$[e-mail]>, UGH <[e-mail]> writes
>>ZL1ANY/TPK 1.82 Msg #:259  Date:19-11-95  Time:11:08Z
>>
>>
>>      Trying to use icom 720a on amtor mode a.
The IC720a needs a few mods in order to work on amtor.

The following is from the ICOM newsletter 35 of June 83, article by Roy
Philpott DJ0OW, G3VCH.

Quote: All mods are to the main board, easily accessible on the top of
the set. The modification consists of replacing C42 and C43 with 1uF.
Also replacing C40 (1uF) with 0.47uF. This effectivly shortens the T-R
switching, also it is necessary to remove the AF amp mute by placing a
shorting link across C69 (there will be audio present on normal
operation, but it doesn't cause a problem).

I did this mod when I had an IC720a and it worked fine with an AMT-1
terminal on "SSB" mode.
--
David Johnson


From Unknown Mon Jan 01 01:10:07 1996
Path: news.epix.net!news.sprintlink.net!rain.fr!world-net!usenet
From: [e-mail] (Hello)
Newsgroups: rec.radio.amateur.homebrew
Subject: SHEMATICS RDS ENCODER
Date: Fri, 29 Dec 1995 03:15:16 GMT
Organization: World-Net information exchange, Internet provider.
Lines: 11
Message-ID: <4bvmni$[e-mail]>
NNTP-Posting-Host: client74.sct.fr
X-Newsreader: Forte Free Agent 1.0.82

Hi,

Can someone help me : I'm trying to make a RDS encoder.
Looking for shematics, informations, pointers...

Help !

Thanks
Will the Force Be with you for the next year.
Email [e-mail]



From Unknown Mon Jan 01 01:10:07 1996
Path: news.epix.net!news.sprintlink.net!ddi2.digital.net!spacecoast-bbs!russ.wuertz
From: [e-mail] (RUSS WUERTZ)
Newsgroups: rec.radio.amateur.homebrew
Subject: Reception in your teeth
Message-ID: <[e-mail]>
Date: Fri, 29 Dec 95 08:27:00 -0500
Distribution: world
Organization: Space Coast BBS, e3 Company, Titusville, FL; 407-269-2169
Reply-To: [e-mail] (RUSS WUERTZ)
X-Newsreader: PCBoard Version 15.21
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    The Station Manager of WELI radio in Hamden, CT. said I had a wire
tap in my tooth.   People including children were repeating things that
I was saying and that is how he explained it.

     People recieving... are recieving my thoughts I discovered in much
the same way a modem works decoding that frequency into thoughts and are
very accurate.   Children do this all day long here as I sit.

      I pick up the phone when modeming and hear that sound, and during
the night as I sleep I hear that same sound, but at a higher frequency
in my head.

       I was told by the FCC that radio telephone is doing that and that
they are not licensed to recieve but only to broadcast.


From Unknown Mon Jan 01 01:10:08 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!newsstand.cit.cornell.edu!cornellcs!uw-beaver!uw-coco!nwnews.wa.com!nwfocus.wa.com!ender.techcenter.paccar.com!news
From: [e-mail] (Michael A. Sterba)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 10 metre band antenna
Date: 29 Dec 1995 11:25:57 GMT
Organization: OES Skagit County WA.
Lines: 17
Message-ID: <4c0j85$[e-mail]>
References: <4brm90$[e-mail]>
NNTP-Posting-Host: kg7hq.paccar.com
Mime-Version: 1.0
X-Newsreader: WinVN 0.99.4

Hello,

In article <4brm90$[e-mail]>, [e-mail] says...
>
>Does anyone have any designs for a small antenna for use on the 10
>metre band (Rx and Tx). The antenna would need to be only a few feet
>long for mounting in the loft.

There is a in apartment antenna kit out on the market for the 11 Meter CB band
. It
uses fiberglass loaded whips for the main radiating element and ground planes.
 You
might want to adapt the same idea for your 10 Meter station.
Hope this helps..... :)

--
                "Handcrafted From The Finest ASCII"
73's de KG7HQ



From Unknown Mon Jan 01 01:10:09 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!pacifier!rainrgnews0!hevanet.com!usenet
From: "Michael G. Reiney" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: I need help\advice on homebrew device
Date: 29 Dec 1995 12:35:28 GMT
Organization: Hevanet Communications
Lines: 35
Message-ID: <4c0nag$[e-mail]>
References: <4bstlv$[e-mail]> <4bubgn$[e-mail]>
NNTP-Posting-Host: br-ppp00.hevanet.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)

c'mon, the guy asked a legitimate question.  We don't have to care
why or agree with the motivation.  I'm just bored enuff to try to
answer it.

You need two oscillators, one for the tone and one to clock the counter.
You need a counter that sits at 0 while the mic ptt is down, counts to 10 and
hangs
there when PTT is up. Gate the tone off when the counter is at 0,4,6,10 giving
 a K
when PTT is released.  Buffer PTT and hold it asserted while the counter is no
t at
state 10.

It will almost fit in a 20V8.  I'm not sure you can build a reliable oscillato
r
without using two of the 8 logic blocks.  Need to think more about that.

If you'd settle for a courtesy beep, it could be done with a dual one-shot.
It's a five minute hack.  It's at least a start.
Have fun, miker





[e-mail]   (Bill Newkirk) wrote:
>In <4bstlv$[e-mail]>, [e-mail] (Allan Moyse)
writes:
>>desk microphone that will send the letter "K" when the PTT button is
>>released.  This would signify that you are now ready to receive.  If
>
>how about just having the operator saying something like "go ahead" or "over"
?
>
>Bill Newkirk WB9IVR                  The Space Coast Amateur Technical Group
>Melbourne, FL                       duty now for the future of amateur radio
>Lombardi's 1st Law of Business:
>Companies succeed in spite of their best effort.  If they succeed at all.
>




From Unknown Mon Jan 01 01:10:10 1996
Path: news.epix.net!news.sprintlink.net!cyberspace.com!imci2!newsfeed.internetmci.com!news.fibr.net!nntp.news.primenet.com!news.primenet.com!ip157
From: [e-mail] (Scott Townley)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Using HP8690 with HP8410 Network Analyzer ???
Date: 29 Dec 1995 14:32:01 -0700
Organization: Primenet Services for the Internet
Lines: 11
Sender: [e-mail]
Message-ID: <4c1moh$[e-mail]>
X-Posted-By: ip157.phx.primenet.com
X-Newsreader: News Xpress Version 1.0 Beta #4
Xref: news.epix.net rec.radio.amateur.equipment:23204 rec.radio.amateur.homebrew:12431

The HP8410 Network Analyzer documentation specifically mentions the HP8620C as

the sweeper of choice, even coming from the factory (at the time) with a
control interconnect cable for the '8620.

Does anyone have any insight on if and/or how an HP8690 can be used as the
sweeper in an HP8410 system??

Thanks in Advance,

Scott Townley
[e-mail]


From Unknown Mon Jan 01 01:10:11 1996
Path: news.epix.net!news.sprintlink.net!twizzler.callamer.com!biggulp.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Automatic Tuner Article
Date: Fri, 29 Dec 1995 14:43:25 -0800
Organization: Call America Internet Services  [phone]
Lines: 30
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: biggulp.callamer.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <[e-mail]>

Yes Jim, you are right.  I wanted to build the tuner as well but found
that the source code was not about to be released even though it could be
duplicated simply by buying one microchip from the author and reading it
out. This just irritates me to no end and should not be QST policy! W6HDO

On Fri, 29 Dec 1995, James Griffith wrote:

> In article <[e-mail]>, [e-mail] says...
> >
> >Hello there,
> >
> >Would anyone be willing to copy and mail me the article from QST
> >concerning the automatic tuner?  I am not presently a member of
> >ARRL so therefore do not get QST. I am more than willing to pay
> >for copying and postage.  Plese send me e-mail if you would be
> >willing to do this for me.
> >
> >73 de Carl N1DXM
> >[e-mail]
> >
> >QST is sold at most major news stands and magazine racks now. You might
> want to try that. The artical is not that big a deal. It's an
> advertisment so its writer can make money. It would be difficult to
> duplicate without buying their kit. QST is going same way Popular
> Electroncs went years ago, selling kits with articles.
>
> Jim, WA7NDD
>
>
>


From Unknown Mon Jan 01 01:10:12 1996
Path: news.epix.net!news.sprintlink.net!twizzler.callamer.com!biggulp.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: VCO regulator chips
Date: Fri, 29 Dec 1995 14:50:04 -0800
Organization: Call America Internet Services  [phone]
Lines: 26
Message-ID: <[e-mail]>
References: <4c1cn5$[e-mail]>
NNTP-Posting-Host: biggulp.callamer.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <4c1cn5$[e-mail]>

Zack, I have run headlong into the very same problem!  I attempted to
select 7805 chips and kind of bypassed the problem that way.  Then I ran
into the old low dropout regulator chip, LM2930.  It was much better in
general probably due to the PNP pass transistor within the chip.  The
problemn is that this chip is no longer available.  If you would like to
try one, I have a few left over.  73  Cliff Buttschardt  W6HDO

On 29 Dec 1995, Zack Lau wrote:

> Is there a better chip to use than the
> ancient 723 regulator chip?  The National
> Databook lists its output noise as
> typically 2.5 uV rms between 100Hz and
> 10 kHz.  The 78L05 and LM317 are much
> worse (40 uV, 0.003 %)
>
> I don't think it helps to run VCOs off of
> noisy power supplies if you are trying
> to minimize phase noise.
>
> Zack KH6CP/1
>
>
>
>
>


From Unknown Mon Jan 01 01:10:13 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!news-relay.us.dell.com!pmafire!net.ricks.edu!usenet
From: [e-mail] (James Griffith)
Subject: Re: QST Automatic Tuner Article
Message-ID: <[e-mail]>
Sender: [e-mail] (usenet)
Organization: Ricks College
X-Newsreader: WinVN 0.93.11
References: <[e-mail]>
Mime-Version: 1.0
Date: Fri, 29 Dec 1995 15:49:03 GMT
Lines: 21

In article <[e-mail]>, [e-mail] says...
>
>Hello there,
>
>Would anyone be willing to copy and mail me the article from QST
>concerning the automatic tuner?  I am not presently a member of
>ARRL so therefore do not get QST. I am more than willing to pay
>for copying and postage.  Plese send me e-mail if you would be
>willing to do this for me.
>
>73 de Carl N1DXM
>[e-mail]
>
>QST is sold at most major news stands and magazine racks now. You might
want to try that. The artical is not that big a deal. It's an
advertisment so its writer can make money. It would be difficult to
duplicate without buying their kit. QST is going same way Popular
Electroncs went years ago, selling kits with articles.

Jim, WA7NDD



From Unknown Mon Jan 01 01:10:14 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!netnews.nwnet.net!news.u.washington.edu!fpm
From: [e-mail] (Frank Miles)
Newsgroups: sci.electronics,rec.radio.amateur.homebrew
Subject: Re: Formulas for notch filters?  Help!
Date: 29 Dec 1995 18:29:26 GMT
Organization: University of Washington, Seattle
Lines: 23
Message-ID: <4c1c26$[e-mail]>
References: <4c11qk$[e-mail]>
NNTP-Posting-Host: saul4.u.washington.edu
NNTP-Posting-User: fpm
Xref: news.epix.net sci.electronics:164053 rec.radio.amateur.homebrew:12425

In article <4c11qk$[e-mail]>,
Jonathan  Sherman <[e-mail]> wrote:
>Does anyone have the formulas for making notch filters? Or at least some
>examples of schematics?  Thanks!
>
>-jon
>[e-mail]
>[e-mail]
>
If you know how to design from Laplace -- take a bandpass filter.  Subtract
from 1 -> band-reject.

For example, bandpass= a*s/(s^2+s*wn/Q+wn^2) ->
         (Q s^2 + s(wn - a Q) + Q wn^2)
          -----------------------------
         (Q s^2 + s(wn)       + Q wn^2)

Or you can use an ordinary bandpass filter (e.g. standard IC), do the
subtraction with a diff amp.
There are many ways to approach this one.

                -frank



From Unknown Mon Jan 01 01:10:15 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!elroy.jpl.nasa.gov!decwrl!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news
From: Zack Lau <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: VCO regulator chips
Date: 29 Dec 1995 18:40:37 GMT
Organization: American Radio Relay League
Lines: 15
Message-ID: <4c1cn5$[e-mail]>
NNTP-Posting-Host: zlau.arrl.org
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2N (Windows; I; 16bit)

Is there a better chip to use than the
ancient 723 regulator chip?  The National
Databook lists its output noise as
typically 2.5 uV rms between 100Hz and
10 kHz.  The 78L05 and LM317 are much
worse (40 uV, 0.003 %)

I don't think it helps to run VCOs off of
noisy power supplies if you are trying
to minimize phase noise.

Zack KH6CP/1





From Unknown Mon Jan 01 01:10:17 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!newsjunkie.ans.net!inet.d48.lilly.com!inet.d48.lilly.com!nntp
Newsgroups: rec.radio.amateur.homebrew
Subject: 10GHz audio link
Message-ID: <[e-mail]>
From: Michael Brown <[e-mail]>
Date: 29 Dec 95 19:39:05 EST
Distribution: world
Organization: Eli Lilly & Company, Inc.
Nntp-Posting-Host: cis074.d51.lilly.com
X-Mailer: Mozilla 1.22 (Windows; I; 32bit)
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; charset=us-ascii
Lines: 12

I'm looking for information on building a point-to-point audio
link using a pair of 10GHz gunnplexors. I've done a few
internet searches but I haven't found much.

Does anyone have any schematics, faqs, hints, etc?

Thanks,
Michael
KG9DW
[e-mail]




From Unknown Mon Jan 01 01:10:18 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!tank.news.pipex.net!pipex!sunsite.doc.ic.ac.uk!demon!hamlab.demon.co.uk
From: [e-mail] (Steve Drury)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: VCO regulator chips
Date: Fri, 29 Dec 1995 19:54:46 GMT
Lines: 24
Message-ID: <[e-mail]>
References: <4c1cn5$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: hamlab.demon.co.uk
X-NNTP-Posting-Host: hamlab.demon.co.uk
X-Newsreader: Forte Free Agent v0.46

Zack Lau <[e-mail]> wrote:

>Is there a better chip to use than the
>ancient 723 regulator chip?  The National
>Databook lists its output noise as
>typically 2.5 uV rms between 100Hz and
>10 kHz.  The 78L05 and LM317 are much
>worse (40 uV, 0.003 %)

>I don't think it helps to run VCOs off of
>noisy power supplies if you are trying
>to minimize phase noise.

>Zack KH6CP/1

I use a large capacitor (I.E. 470uf across 100n) in series with some
resistance and an ordinary regulator (78L08). This provides a noise free
supply in my designs.


From Steve Drury.     Email [e-mail]
G6ALU Milton Keynes England



From Unknown Mon Jan 01 01:10:19 1996
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!math.ohio-state.edu!newsfeed.acns.nwu.edu!ftpbox!mothost!newdelph.rtsg.mot.com!kd9jq
From: [e-mail] (Charles H. Reichert)
Newsgroups: rec.radio.amateur.homebrew
Subject: CLEANING SHACK
Date: Fri, 29 Dec 95 20:03:17 GMT
Organization: Motorola CIG
Lines: 26
Message-ID: <4c1i7c$[e-mail]>
NNTP-Posting-Host: dialup_ip_09.dialup.cig.mot.com
Keywords: components
X-Newsreader: News Xpress Version 1.0 Beta #4


CLEANING OUT THE SHACK:
I've finally called it quits after 30 years
of homebrewing. (No..still will keep the Lic.)

Willing to almost give-away the goodies.

I have parts cabinets with parts, other misc goodies
I'll sell off in lots cheap.  Call for time to see
the goodies if interested.  If you like what you see
make an offer!

Located in north side of Hoffman Estates, IL.

                        \|/
                        ^ ^
                      ( O O )
                ___.ooO__U__Ooo.___
                 Hmmmm...Could Be!
=====================================================
|          KD9JQ              708-358-3827  Home    |
|    Charles H. Reichert      708-632-6669  Work    |
|      955 Concord Ln.                              |
|  Hoffman Ests., IL. 60195   [e-mail]  |
=====================================================



From Unknown Mon Jan 01 01:10:20 1996
Path: news.epix.net!news.sprintlink.net!nwgw.infi.net!solaris.cc.vt.edu!news.duke.edu!news-server.ncren.net!hearst.acc.Virginia.EDU!freenet.vcu.edu!hibbs.vcu.edu!not-for-mail
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Ramsey Reciever Question
Date: 29 Dec 1995 20:12:18 -0500
Organization: Virginia Commonwealth University
Lines: 7
Distribution: world
Message-ID: <4c23li$[e-mail]>
NNTP-Posting-Host: hibbs.vcu.edu

I am thinking of buying a Ramsey reciever kit (from Radio
Shack).  They offer recievers for a few different bands, which
band kit should I buy?

Thanks

Ben


From Unknown Mon Jan 01 01:10:21 1996
Newsgroups: sci.electronics,rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!lamarck.sura.net!fconvx.ncifcrf.gov!mack
From: [e-mail] (Joe Mack)
Subject: Re: Formulas for notch filters?  Help!
Message-ID: <[e-mail]>
Organization: Frederick Cancer Research and Development Center
References: <4c11qk$[e-mail]>
Date: Fri, 29 Dec 1995 20:36:36 GMT
Lines: 19
Xref: news.epix.net sci.electronics:164071 rec.radio.amateur.homebrew:12429

In article <4c11qk$[e-mail]> [e-mail] (Jonathan  Sh
erman) writes:
>Does anyone have the formulas for making notch filters? Or at least some
>examples of schematics?  Thanks!

Try the index in your university library. It's a pretty mature field. Don
Lancaster has a good introductory book on (audio) filters. Nov 95 QEX
(ARRL, Newington CT) has an article on a notch filter to remove an
AM BC station.

        Joe Mack NA3T
        [e-mail]

>
>-jon
>[e-mail]
>[e-mail]
>




From Unknown Mon Jan 01 01:10:22 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.msfc.nasa.gov!elroy.jpl.nasa.gov!decwrl!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb
From: [e-mail] (Tom Bruhns)
Newsgroups: sci.electronics,rec.radio.amateur.homebrew
Subject: Re: Formulas for notch filters?  Help!
Followup-To: sci.electronics,rec.radio.amateur.homebrew
Date: 29 Dec 1995 20:40:59 GMT
Organization: Hewlett Packard Corvallis Site
Lines: 12
Message-ID: <4c1jor$[e-mail]>
References: <4c11qk$[e-mail]>
NNTP-Posting-Host: hplsnb.lsid.hp.com
X-Newsreader: TIN [version 1.1 PL9.4]
Xref: news.epix.net sci.electronics:164072 rec.radio.amateur.homebrew:12430

Jonathan  Sherman ([e-mail]) wrote:
: Does anyone have the formulas for making notch filters? Or at least some
: examples of schematics?  Thanks!

Umm, what sort of notch filter?  Audio?  RF?  What power level?
Analog or digital?  Passive or active?  What sort of specs are you
looking for?  (Attenuation, stop-band width, flatness of the non-
rejected portion, ...)

Cheers,
Tom
[e-mail]


From Unknown Mon Jan 01 01:10:23 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!col.hp.com!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb
From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: VCO regulator chips
Date: 29 Dec 1995 20:54:55 GMT
Organization: Hewlett Packard Corvallis Site
Lines: 39
Message-ID: <4c1kiv$[e-mail]>
References: <4c1cn5$[e-mail]>
NNTP-Posting-Host: hplsnb.lsid.hp.com
X-Newsreader: TIN [version 1.1 PL9.4]

Zack Lau ([e-mail]) wrote:
: Is there a better chip to use than the
: ancient 723 regulator chip?  The National
: Databook lists its output noise as
: typically 2.5 uV rms between 100Hz and
: 10 kHz.  The 78L05 and LM317 are much
: worse (40 uV, 0.003 %)

: I don't think it helps to run VCOs off of
: noisy power supplies if you are trying
: to minimize phase noise.

Yep, it's a problem.  In fact, it can even be a
problem for power or references for audio amplifiers,
if you are trying to get to really low noise performance.
It's a problem with voltage references as well as for
regulators.  What I've done with some success is filter
the output of a voltage reference with an RC filter and
feed this to an op amp follower; the op amp might include
an emitter follower buffer in its feedback loop, in order
to get enough output current.  You might also get by with
an LC filter on the output of a regulator, but I've never
had the space for large enough L's to do much good in the
10s of Hz range.  If you use the op-amp follower approach,
use a low-noise op amp, and make sure its power supplies
are reasonably clean.  If you use a single pole RC as the
filter between the reference and op amp, you can get it
to settle faster if you put a diode across the R.  If you
aren't worried about filtering down to the 1Hz range, this
might not be a problem but it can be if the RC time constant
is several seconds.  Of course, you can make the filter
a 2-pole active one, feeding the op amp output back
appropriately, and that helps a lot in getting good filtering
but reasonable turn-on times.

--
Cheers,
Tom
[e-mail]


From Unknown Mon Jan 01 01:10:24 1996
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.dorsai.org!news.ilx.com!psinntp!psinntp!psinntp!howland.reston.ans.net!ix.netcom.com!netcom.com!feustel
From: [e-mail] (David Feustel)
Subject: Variable Speed Motor Control Circuit?
Message-ID: <[e-mail]>
Organization: DAFCO
X-Newsreader: TIN [version 1.2 PL1]
Date: Fri, 29 Dec 1995 21:27:52 GMT
Lines: 18
Sender: [e-mail]
Xref: news.epix.net rec.radio.amateur.equipment:23234 rec.radio.amateur.homebrew:12459

[ Article crossposted from comp.arch.embedded,rec.radio.amateur.misc ]
[ Author was David Feustel ]
[ Posted on Fri, 29 Dec 1995 20:45:26 GMT ]

I'm looking for an add-on circuit to vary the speed of cassette recorder
motors. I want to be able to vary the speed from 2*x to x/8 where x
is the normal cassette motor speed. All suggestions & solutions
appreciated.
--
[e-mail]              *** Web Page Access now FIXED ***
Dave Feustel N9MYI      For PGP Public Key, finger [e-mail]
Fort Wayne, IN          Or else access http://www.mixi.net/~feustel/
219-483-1857
--
[e-mail]              *** Web Page Access now FIXED ***
Dave Feustel N9MYI      For PGP Public Key, finger [e-mail]
Fort Wayne, IN          Or else access http://www.mixi.net/~feustel/
219-483-1857


From Unknown Mon Jan 01 01:10:26 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!col.hp.com!news.dtc.hp.com!hpscit.sc.hp.com!rkarlqu
From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: VCO regulator chips
Date: 29 Dec 1995 22:56:19 GMT
Organization: Hewlett-Packard
Lines: 33
Message-ID: <4c1rmj$[e-mail]>
References: <4c1cn5$[e-mail]> <[e-mail]>
NNTP-Posting-Host: hpscrj.scd.hp.com

In article <[e-mail]>,
Steve Drury <[e-mail]> wrote:
>Zack Lau <[e-mail]> wrote:
>
>>Is there a better chip to use than the
>>ancient 723 regulator chip?  The National
>>Databook lists its output noise as
>>typically 2.5 uV rms between 100Hz and
>>10 kHz.  The 78L05 and LM317 are much
>>worse (40 uV, 0.003 %)
>
>>I don't think it helps to run VCOs off of
>>noisy power supplies if you are trying
>>to minimize phase noise.
>
>>Zack KH6CP/1
>
>I use a large capacitor (I.E. 470uf across 100n) in series with some
>resistance and an ordinary regulator (78L08). This provides a noise free
>supply in my designs.
>
>
>From Steve Drury.     Email [e-mail]
>G6ALU Milton Keynes England
>

The lowest noise commonly available regulator is the TL431.
If you want to go lower than this, you have to use a 1N821 reference
diode.

Rick Karlquist N6RK
[e-mail]



From Unknown Mon Jan 01 01:10:27 1996
Path: news.epix.net!news.sprintlink.net!wizard.pn.com!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!in2.uu.net!news.pcix.com!root
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: SV818 need info
Date: 29 Dec 1995 23:38:26 GMT
Organization: a Digital Internet AlphaServer Site
Lines: 2
Message-ID: <4c1u5i$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: hingham14.pcix.com
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

>> SV818.
Hi Cliff, My NTE and  TCE don't show SV818, see other msg.  Dave - AA1A


From Unknown Mon Jan 01 01:10:28 1996
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!natinst.com!news-relay.us.dell.com!swrinde!tank.news.pipex.net!pipex!peer-news.britain.eu.net!EU.net!Belgium.EU.net!ping.be!news
From: Geert Pirens <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: I need help, for Kansas City Tracker.
Date: Sat, 30 Dec 1995 01:38:40 -0800
Organization: PING Belgium
Lines: 26
Message-ID: <[e-mail]>
NNTP-Posting-Host: dialup09.hasselt.eunet.be
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X-Mailer: Mozilla 2.0b3 (Win16; I)

Hello all,

Can anybody help me on:


I am looking for a schematic of a Kansas City Tracker, or compatible.

If aneyone have some kind of schematic or PCB layout ?

Or if you have better stuff than this? plaese send me more information.

I like to send commands via my computer to the antenna rotors.

The program I use is INSTANT TRACK v1.0b.

Who is so kind to help me with this ? I wil pay if needed!

PLAESE contact me!! by sending e-mail, or fido mail.

Greetings

Geert Pirens

E-Mail     [e-mail]
  or       [e-mail]
Fidonet    Geert Pirens / 2:292/115.9


From Unknown Mon Jan 01 01:10:29 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!news.ultranet.com!amber1.ultranet.com!user
From: [e-mail] (Jon Goguen)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: Using HP8690 with HP8410 Network Analyzer ???
Date: 30 Dec 1995 01:44:58 GMT
Organization: UltraNet Communications, Inc.
Lines: 24
Message-ID: <[e-mail]>
References: <4c1moh$[e-mail]>
NNTP-Posting-Host: amber1.ultranet.com
X-Newsreader: Value-Added NewsWatcher 2.0b22.0+
Xref: news.epix.net rec.radio.amateur.equipment:23207 rec.radio.amateur.homebrew:12443

In article <4c1moh$[e-mail]>, [e-mail] (Scott
Townley) wrote:

> The HP8410 Network Analyzer documentation specifically mentions the
HP8620C as
> the sweeper of choice, even coming from the factory (at the time) with a
> control interconnect cable for the '8620.
>
> Does anyone have any insight on if and/or how an HP8690 can be used as the
> sweeper in an HP8410 system??
>


Scott,

My 8410 manual is apparently older than yours, and has instruction for
using the 8690.  I recently aquired the latter, but haven't had a chance
to fool with them yet.  If you send me your address, I'll copy the
relevant manual pages pages and send them to you.  I could also fax them
if you would prefer.

Cheers,

Jon


From Unknown Mon Jan 01 01:10:30 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!istar.net!infoshare!whome!gts!westonia!news
From: [e-mail] (Joseph Cooper)
Subject: Need Heathkit replacement part numbers
X-Nntp-Posting-Host: ppp-9.ppp.westonia.com
Content-Type: Text/Plain; charset=US-ASCII
Message-ID: <[e-mail]>
Sender: [e-mail]
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Date: Sat, 30 Dec 1995 02:46:13 GMT
Lines: 15

I am repairing a Heathkit Active Antenna HD-1424A

Would anyone know the replacement numbers for the MOSFET and
transistors

Heath Number    Part

417-290         Dual Gate MOSFET

417-931         Transistor (Amp)

Thanks and 73's

VE3FMQ



From Unknown Mon Jan 01 01:10:31 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!cdc2.cdc.net!news1.cris.com!news
From: [e-mail] (Marco G Chiriboga)
Newsgroups: soc.culture.venezuela,soc.culture.uruguay,soc.culture.spain,soc.culture.peru,soc.culture.mexican.american,soc.culture.latin-america,soc.culture.ecuador,soc.culture.cuba,soc.culture.colombia,soc.culture.chile,soc.culture.bolivia,soc.culture.argentina,rec.radio.amateur.policy,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.digital.misc,rec.radio.amateur.antenna
Subject: Re: Un francΘs estß buscando contacto
Date: Sat, 30 Dec 1995 04:19:19 GMT
Organization: Concentric Internet Services
Lines: 37
Message-ID: <4c27r4$[e-mail]>
References: <[e-mail]> <[e-mail]> <estrella-2012951410390001@128.125.62.135>
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[e-mail] wrote:

>In article <[e-mail]>, Philippe CUVINOT
><[e-mail]> wrote:

>> Hola,
>>
>> Soy francΘs y estoy buscando a amigos para conversar acerca de temas
>> latino americanos. Me interesa muchφsimo la cultura precolombina y
>> estoy realizando una pßgina a prop≤sito de las grandes civilizaciones.
>> Escribanme para darme ideas interesantes. Gracias.
>> Hasta pronto, Philippe.

>Hola Philippe,

>   Yo soy frances tambien, y vivo en Los Angeles, California. Trabajo como
>bibliotecario especializado en literatura mexicana y centro americana, en
>la University of Southern California. Me gustaria conversar contigo en
>cualquier idioma (espanol, frances, ingles) y ayudarte. Aqui en el sur de
>la California hay mucha gente de habla hispana y muchas organizaciones
>culturales : mexicanas, salvadorenas, hondurenas......bueno una fuente muy
>larga de posibilidades. Puedes usar mi correo electronico directamente

>[e-mail]

>espero hablar contigo muy pronto!  gracias

>JEAN-LUC


>JEAN-LUC ESTRELLA
>DOHENY MEMORIAL LIBRARY
>UNIVERSITY PARK CAMPUS
>LOS ANGELES, CA, 90089
>U.S.A.




From Unknown Mon Jan 01 01:10:32 1996
Path: news.epix.net!news.sprintlink.net!jupiter.planet.net!news.ia.net!usenet
From: [e-mail] (Allan Butler)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 10GHz audio link
Date: 30 Dec 1995 05:52:04 GMT
Organization: Inter Access Internet services Cedar Rapids IA USA
Lines: 25
Distribution: world
Message-ID: <4c2k24$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: pbutlalj.ia.net
Mime-Version: 1.0
X-Newsreader: WinVN 0.93.11

In article <[e-mail]>, [e-mail]
says...
>
>I'm looking for information on building a point-to-point audio
>link using a pair of 10GHz gunnplexors. I've done a few
>internet searches but I haven't found much.

                Michael,

        In the older Handbooks there was a schematic and plan for a 2
million bit per second digital link.  Would you be satisfied with a setup
that would take the audio, turn it into digital data.  Then send it and
convert it back to audio?  This way multiple audion channels can be sent
over the same link.  Also if this is to be used as a link between a repeater
transmit and receive sight,  the control signals from the receiver don't
have to be encoded as tones.

        This unit can operate either at 10 GHz like you mention or it could
be made to operate at the K band at 24 GHz.  Claimed range with parabolic
antennas is approximately 20 to 30 miles, line of sight.

--
                                                Allan Butler KA0IES
                                                [e-mail]



From Unknown Mon Jan 01 01:10:33 1996
Path: news.epix.net!news.sprintlink.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!in2.uu.net!DIALix!brisbane.DIALix.oz.au!not-for-mail
From: [e-mail] (Murray Kelly)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 144MHz Crystal Receiver
Date: 30 Dec 1995 13:21:20 +1000
Organization: DIALix Services, Brisbane, Australia.
Lines: 14
Sender: [e-mail]
Message-ID: <4c2b7g$31j$[e-mail]>
References: <4bsjij$[e-mail]>
NNTP-Posting-Host: [e-mail]

C Jefferson <cjeffers@204.248.112.2> writes:

>I'm looking for a crystal controlled 2-meter receiver that would be
>fairly cheap. I'm going to use it for a permant repeater monitor. If
>anybody has anything of the sort send a reply please. Thank you very much
>73's from KB0THN.
>(:)=)


Could you change the crystal and retune a Radio Shack weather
radio? They're pretty simple inside.

Murray Kelly. vk4aok.



From Unknown Mon Jan 01 01:10:34 1996
Path: news.epix.net!news.sprintlink.net!news.dpc.net!news.heurikon.com!news.ahc.ameritech.com!ddsw1!news.mcs.net!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!newsfeed.internetmci.com!in1.uu.net!jaring.my!genes!wired
From: [e-mail] (Eugene Kang)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Reception in your teeth
Message-ID: <[e-mail]>
References: <[e-mail]>
Date: Sat, 30 Dec 95 13:22:14 GMT
Organization: My_Organisation
Lines: 21

In article <[e-mail]> russ.wuertz@spacecoas
t-bbs.com writes:
>
>
>    The Station Manager of WELI radio in Hamden, CT. said I had a wire
>tap in my tooth.   People including children were repeating things that
>I was saying and that is how he explained it.
>
>     People recieving... are recieving my thoughts I discovered in much
>the same way a modem works decoding that frequency into thoughts and are
>very accurate.   Children do this all day long here as I sit.
>
>      I pick up the phone when modeming and hear that sound, and during
>the night as I sleep I hear that same sound, but at a higher frequency
>in my head.
>
>       I was told by the FCC that radio telephone is doing that and that
>they are not licensed to recieve but only to broadcast.


R u serious?



From Unknown Mon Jan 01 01:10:36 1996
Path: news.epix.net!news.sprintlink.net!dns.crocker.com!wizard.pn.com!brighton.openmarket.com!decwrl!sunsite.doc.ic.ac.uk!demon!thegle.demon.co.uk
From: [e-mail] (T H Bratton)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Drilling PC boards
Date: Sat, 30 Dec 1995 15:17:10 GMT
Lines: 53
Message-ID: <[e-mail]>
References: <[e-mail]> <4a53br$[e-mail]> <[e-mail]> <4ase2j$[e-mail]>
NNTP-Posting-Host: thegle.demon.co.uk
X-NNTP-Posting-Host: thegle.demon.co.uk
X-Newsreader: Forte Agent .99b.112

Bob,

Many thanks for the additional information,  and for the diagram
worth a thousand words.

I don't know what  response you have had to your posting,  but  you
have certainly got me interested, and I'd be most grateful for any
further info you can find time to post,  please.

You triggered the memory cells,  and over the Christmas period I dug
out an old copy of a UK magazine, Wireless World   (Jan 1984 !) which
had an article on a home made X-Y plotter.   This provided some
alternative ideas for the X and Y mechanism. using aluminium  (sorry,
aluminum!)  u-shaped channeling  and ball bearings instead of ground
rods for one side of the table , and tap (faucet) washers as wheels
for the other side,  thus avoiding the need for accurate alignment of
the rods.  I guess at that time scrap printer mechanisms were not
available.

Being a plotter it used  only  a solenoid for  pen up/down.
I have been thinking about how to make the Z axis  control with the
limited facilities I have.  The movement required is only a little
more than the PCB thickness, but I see problems with limiting sideways
play whilst at the same time keeping the mass down.    ( Until I saw
your diagram I wondered  if you were moving the board in the X-Y
planes whilst keeping the drill position fixed, which is another way
of doing it -   but there is still the problem of Z axis sideways
play).     I'd be interested in your solution to this.

I also downloaded a useful stepper motor tutorial file from
armory.com/pub/user/rstevew.    Wonderful thing,  this Internet.

I would be very interested in the pcb/software idea,  but I think
there might be problems with the multitude of different stepper motor
types around,  with their differing drive requirements. A kit to cover
all kinds would be tricky, I would think.  However, anything you can
make available, diagrams or software,  would save a lot of effort
reinventing the wheel so to speak,  but I appreciate your boss would
probably not be too keen!


Anyway, thanks again, it's good to know that in this black-box,
throw-away age there are still people prepared to have a go at making
things themselves.

Best wishes for 1996.


Tom Bratton

(reposted to newsgroup)



From Unknown Mon Jan 01 01:10:37 1996
Path: news.epix.net!news.sprintlink.net!ddi2.digital.net!usenet
From: [e-mail] (Russ)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: VCO regulator chips
Date: 30 Dec 1995 19:21:42 GMT
Organization: FLORIDA ONLINE, Florida's Premier Internet Provider
Lines: 10
Message-ID: <4c43g6$[e-mail]>
References: <4c1cn5$[e-mail]> <4c43ai$[e-mail]>
NNTP-Posting-Host: @ppp153.gslink.net
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.6


->At these levels, you'll need to pay
->particular attention to circuit layout
->and electronic package (crosstalk, EMC,
      ^^^^^^^^^^^^^^^^^^

ooops, that should say electronic packaging!

RL



From Unknown Mon Jan 01 01:10:38 1996
Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!minfox!tom.alldread
From: [e-mail] (Tom Alldread)
Newsgroups: rec.radio.amateur.homebrew
Subject: !SUPER KEYER II - MYSTERY SOLVED!
Date: Sat, 30 Dec 1995 21:50:00 GMT
Message-ID: <[e-mail]>
Organization: MINFOX Courtenay, BC (604)-337-2023
Distribution: world
Lines: 35


Greetings All:

        I built the now superseded CMOS SUPER KEYER II from the Nov.
1990 issue of QST. I use it with a Bencher paddle and have been very
pleased with its operation with the exception that occasionally it
seemed to discharge the batteries pre-maturely.

        I have checked the battery drain several times in the past to
confirm that the micro controller was in fact going into the power
down sleep mode when left idle. Each time I did this test was after
replacing the batteries and I observed the drain fall off to a few
microamperes a few seconds after connecting the the new battery.
Of course in the process of changing the battery I reset the
controller and did the test in the normal power up keyer mode.
Everything appeared fine and I remained mystified.

        Finally I discovered the cause. I had been away on a trip for
five weeks and had just put in a new set of batteries prior to
departure. Upon returning I found the batteries (3 AA alkaline cells,
BTW) discharged. I remembered last using the keyer in the hand key mode
for finalizing my ladder line antenna tuner adjustment (conveniently
done with momentary ~key down~ in the hand key mode). I had left the
SUPER KEYER in the HAND KEY mode.

        I have found that my SUPER KEYER II does not switch into power
down when it is left in the HAND KEY mode. I wonder if anyone
else has identified this in the past or if anyone knows of a change of
firmware in later chips that corrected this bug? I wonder if the new
version III has a similar problem?

73 de VE7TMA

---
 * QMPro 1.53 * Very Best Regards, [e-mail]


From Unknown Mon Jan 01 01:10:40 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!news.iadfw.net!usenet
From: [e-mail] (CLIF PENN)
Newsgroups: sci.electronics,rec.radio.amateur.homebrew
Subject: Re: Notch filters,  Help!
Date: Sat, 30 Dec 1995 23:18:30 GMT
Organization: customer of Internet America
Lines: 69
Message-ID: <4c4adb$[e-mail]>
References: <4c11qk$[e-mail]>
NNTP-Posting-Host: dal19-21.ppp.iadfw.net
X-Newsreader: Forte Free Agent 1.0.82
Xref: news.epix.net sci.electronics:164224 rec.radio.amateur.homebrew:12458

[e-mail] (Jonathan  Sherman) wrote:

>Does anyone have the formulas for making notch filters? Or at least some
>examples of schematics?  Thanks!

>-jon
>[e-mail]
>[e-mail]


Since this is probably of general interest, I decided to post as well
as email.

You did not specify a frequency range so I will give you two common
circuits which have a genuine null (0 transmission) at a single
frequency. These are three terminal networks. In both cases the
selectivity skirts are very steep, the phase shift goes quickly from
-90 to +90 degrees near null, the driving impedance is ideally 0 and
the output impedance ideally infinite. You can however compensate for
real input and output impedance if you wish.

At radio and high audio frequencies a Bridged-T has been used. This
consists of an inductor L, two capacitors each with a value of 2C and
a resistor R. The input and output terminals are the two ends of the L
with a common ground for both terminals. The two capacitors are in
series and bridge the inductance. The junction of the two capacitors
is tied to R whose other end is tied to ground. The null frequency is
the parallel frequency of the equivalent LC network, i.e. where the
reactance of the inductor is equal to the reactance of the two C's in
series. This gives:

2*pi*null-frequency*L = 1/(2*pi*null-frequency*C).

Since the inductance has a finite resistance, the resulting undesired
phase shift is compensated by R as follows:

4R = 2*pi*null-frequency*L  * Q   where Q is the inductor reactance
divided by its resistance.

At audio and supersonic frequencies, a network that is referred to in
the literature by two different names is used--the Twin-T and the
Parallel-T.
This consists of three resistors and three capacitors. One T is made
up of 2 resistors of value R between the input and output terminals
and a capacitor of 2C tied between the junction of these two resistors
and ground. The other T has two capacitors of value C between input
and output and a resistor of value R/2 between the juction of the two
capacitors and ground. The null frequency is where R equals the
reactance of C, i.e.

R = 1/(2*pi*null-frequency*C).

        Speaking from experience, it is very difficult to get the null
frequency of the Twin-T exactly where you want it due to the tolerance
of components. A little known fact is that you can make the resistor
(that has a value of R/2) a potentiometer and vary the null frequency
(still a true null). The wiper of the pot goes to ground. One of the
other ends of the pot is connected at the junction to the two series
capacitors and the other end goes to the capacitor which has a value
of 2C. I saw this long ago in a Russian technical journal, but have
used it many times.


        Although there are other null networks, these two are the most common.

<[e-mail]>    3:11PM  12/30/95





From Unknown Mon Jan 01 01:10:40 1996
Path: news.epix.net!news.sprintlink.net!jupiter.planet.net!earth.planet.net!mason
From: [e-mail] (Test User for Newton 1week)
Newsgroups: rec.radio.amateur.homebrew
Subject: Audio Amplifier
Date: 31 Dec 1995 03:00:44 GMT
Organization: Planet Access Networks - Stanhope, NJ
Lines: 3
Message-ID: <4c4ucs$[e-mail]>
NNTP-Posting-Host: earth.planet.net
X-Newsreader: TIN [version 1.2 PL2]


        Does anyone have any schematics/info on building an audio
amplifier for a standard microphone?


From Unknown Mon Jan 01 01:10:41 1996
Path: news.epix.net!news.sprintlink.net!news1.channel1.com!wizard.pn.com!dns.crocker.com!calweb!usenet
From: "William W. Janssen" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 10GHz audio link
Date: 31 Dec 1995 03:22:56 GMT
Organization: CalWeb Internet Services, Inc.
Lines: 25
Message-ID: <4c4vmg$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: sac1-16.calweb.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; U; 16bit)
To: [e-mail]

Michael Brown <[e-mail]> wrote:
>I'm looking for information on building a point-to-point audio
>link using a pair of 10GHz gunnplexors. I've done a few
>internet searches but I haven't found much.
>
>Does anyone have any schematics, faqs, hints, etc?
>
>Thanks,
>Michael
>KG9DW
>[e-mail]
>
>
There has been information in one of the Microwave Update documents
that are available from ARRL. The way to do this is to FM modulate
the transmitter by using the varactor or by varing the gunn voltage.
the receiver operates as a converter to an FM receiver. the two
gunn oscillators are offset by the FM receiver frequency. This works
great for one way transmission. For two way operation it still works
as you can use the gunn to transmit and receive at the same time but
you will hear your own transmissions as well as the distant end. This
arrangement has been used by many microwave operators
Bill K7NOM




From Unknown Mon Jan 01 01:10:42 1996
Path: news.epix.net!news.sprintlink.net!news1.channel1.com!wizard.pn.com!dns.crocker.com!calweb!usenet
From: "William W. Janssen" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 10GHz audio link
Date: 31 Dec 1995 04:17:06 GMT
Organization: CalWeb Internet Services, Inc.
Lines: 13
Message-ID: <4c52s2$[e-mail]>
References: <[e-mail]> <4c4vmg$[e-mail]>
NNTP-Posting-Host: sac3-147.calweb.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; U; 16bit)
To: [e-mail]

I forgot to mention that you should use wide band FM. The Gunn units
will drift too much for narrow band. You might look for the old style
TVRO receiver units. They used a tuneable converter at the antenna
and a fixed frequency IF receiver at the TV set. The IF was usualy
70 MHz and the bandwidth was about 20 MHz. Even though they were intended
for TV you should be able to use them for voice.

The Microwave Update artice was in the Microwave Update 1991 on page
259. It described modification of a Radio Shack FM receiver to change the
frequency to 30 MHz for use with a Gunn unit.

Bill K7NOM



From Unknown Mon Jan 01 01:10:43 1996
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!btnet!demon!mail2news.demon.co.uk!ifwtech.demon.co.uk
From: Ian G3SEK <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Variable Speed Motor Control Circuit?
Date: Sun, 31 Dec 1995 09:54:04 +0000
Organization: IFWtech
Lines: 38
Message-ID: <[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: ifwtech.demon.co.uk
X-Newsreader: Newswin Alpha 0.9.1
X-Mail2News-Path: relay-4.mail.demon.net!post.demon.co.uk!ifwtech.demon.co.uk

In article: <[e-mail]>  [e-mail] (David
Feustel) writes:
:
: [ Article crossposted from comp.arch.embedded,rec.radio.amateur.misc ]
: [ Author was David Feustel ]
: [ Posted on Fri, 29 Dec 1995 20:45:26 GMT ]
:
: I'm looking for an add-on circuit to vary the speed of cassette recorder
: motors. I want to be able to vary the speed from 2*x to x/8 where x
: is the normal cassette motor speed. All suggestions & solutions
: appreciated.

European meteor-scatter operators have been doing this for years,
receiving Morse at 200+ wpm and slowing the tape down for playback.

Some cheap cassette motors are mechanically governed and there's very
little you can do to change the speed electronically. However, some models
are controlled by a constant-voltage regulator and there's generally a
trimpot to set the speed. By bringing the feedback potentiometer out to a
front-panel control you can often adjust the speed within the kind of range
you want.

The maximum speed depends on the risks you want to run by overloading the
motor. The minimum speed depends on friction, mainly within the tape
cassette itself. You can often reduce the minimum speed by using a
pulsed-DC system; for circuits, check out the books on electronics for
model railroads.




--
73 from Ian G3SEK          Editor, 'The VHF/UHF DX Book'
                          'In Practice' columnist for RadCom (RSGB)
Professionally:
IFW Technical Services     Clear technical English - anywhere.



From Unknown Mon Jan 01 01:10:45 1996
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From: [e-mail] (Kein{nen Paul)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: VCO regulator chips
Date: 31 Dec 1995 11:08:34 +0200
Organization: Tampere University of Technology
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References: <4c1cn5$[e-mail]> <4c1kiv$[e-mail]>
NNTP-Posting-Host: proffa.cc.tut.fi


Zack Lau ([e-mail]) wrote:
: Is there a bette chip to use than the
: ancient 723 regulator chip?  The National
: Databook lists its output noise as
: typically 2.5 uV rms between 100Hz and
: 10 kHz.

The Fairchild data sheet for uA723C lists 2.5 uVrms with Cref=5 uF in the
reference divider and 20 uVrms without Cref. It seems that the real culprit
is the voltage reference and not the error amplifier and output stage.
However, I could not find at what output voltage these noise voltages are
measured. If the main sourc of noise is the voltage reference, you get
much prettier figures at 2 V output than at 36 V output.

Tom Bruhns ([e-mail]) wrote:

> What I've done with some success is filter
> the output of a voltage reference with an RC filter and
> feed this to an op amp follower; the op amp might include
> an emitter follower buffer in its feedback loop, in order
> to get enough output current.

The 723 contains a separate voltage reference and a differential amplifier
and an emitter follower in a smaller package count. Filtering can be
inserted between the reference voltage source and the differential amplifier.

>                 Ifou use te op-amp follower approach,
> use a low-noise op amp, and make sure its power supplies
> are reasonably clean.

Agreed. It is no use to clean up the refeence and then connect a noisy
op-amp (such as 741 or TL081) as the regulator, since the noise from
the op-amp alone can be greater than 2.5 uV at 10 kHz BW. Fortunately,
op-amps with noise densities below 3 nV/sqrt(Hz) are available at
reasonable prices, so you could get 0.3 uV at 10 kHz BW if you had a
clean reference.

                        Paul OH3LWR


--
Phone   : [phone]                       Mail: Hameenpuisto 42 A 26
Internet: [e-mail]                      FIN-33200 TAMPERE
Telex   : 58-100 1825 (ATTN: Keinanen Paul)            FINLAND
X.400   : G=Paul S=Keinanen O=Kotiposti A=ELISA C=FI


From Unknown Mon Jan 01 01:10:46 1996
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From: [e-mail] (Sbrownjr)
Newsgroups: rec.radio.amateur.homebrew
Subject: PLEASE HELP!!!!
Date: 31 Dec 1995 12:41:01 -0500
Organization: America Online, Inc. (1-800-827-6364)
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Sender: [e-mail]
Message-ID: <4c6hvd$[e-mail]>
Reply-To: [e-mail] (Sbrownjr)
NNTP-Posting-Host: newsbf02.mail.aol.com

I recently bought a used Motorola speaker mic. The model number is
NTN4849A. I want to use it with my Radio Shack HTX-202, but I don't know
how to wire it up!! If someone out there could provide me some
instructions, it would be greatly appreciated!



73 de N1VLV
E-mail:[e-mail]


From Unknown Mon Jan 01 01:10:47 1996
Path: news.epix.net!news.sprintlink.net!worldlinx.com!news.worldlinx.com!news
From: Francois Berube <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Mod for FL-101/FR-101
Date: Sun, 31 Dec 1995 14:19:53 -0800
Organization: Club Radio Amateur de Quebec Inc.
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Hello to you ,i have a FL-101 and FR-101 yaesu tx and rx, i want to know
if there is some mods for this equipments ???

thank you
Frank
VA2RC
[e-mail]


From Unknown Mon Jan 01 01:10:48 1996
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From: [e-mail] (Ernest Hansen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Converting Cellular to 902MHZ band
Date: 31 Dec 1995 16:36:39 GMT
Organization: Prodigy Services Company  1-800-PRODIGY
Lines: 12
Distribution: world
Message-ID: <4c6e6n$[e-mail]>
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Does anyone have any advice, recomendations, information or pointers to
information on converting cellular telephone equipment to the 902 MHZ
amateur band? Is it possible? Post or Email me at [e-mail].
Thank You Very Much.




-
  ERNIE [e-mail]




From Unknown Mon Jan 01 01:10:49 1996
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From: Ed Hare <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Automatic Tuner Article
Date: 31 Dec 1995 16:48:02 GMT
Organization: American Radio Relay League, Inc.
Lines: 26
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[e-mail] (James Griffith) wrote:

>>QST is sold at most major news stands and magazine racks now. You might
>want to try that. The artical is not that big a deal. It's an
>advertisment so its writer can make money. It would be difficult to
>duplicate without buying their kit. QST is going same way Popular
>Electroncs went years ago, selling kits with articles.

Hello, Jim,

I don't kwow if I would go *that* far.  First, ARRL doesn't sell the
kits; the authors do.  From the feedback we have received from readers,
most readers *prefer* construction articles that have kits.  And, in most
cases, even if a construction project has a kit, the builder can still
dead-bug it, if he or she chooses.  This tuner article is almost an
exception to the rule, in that it requires a part that is available only
from the author.  However, the author will gladly sell the
progrmammed IC only for those who want to locate all the other
parts themselves. (I wonder if *anyone* will take him up on the
offer; I want the kit! :-)  ).


>Jim, WA7NDD
>




From Unknown Mon Jan 01 01:10:50 1996
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From: [e-mail] (Allen Finne)
Newsgroups: rec.radio.amateur.homebrew
Subject: silver plating, help
Date: 31 Dec 1995 19:12:07 GMT
Organization: World Lynx
Lines: 30
Message-ID: <4c6na7$[e-mail]>
NNTP-Posting-Host: major.cei.net
X-Newsreader: TIN [version 1.2 PL2]

I am attempting to silver plate a brass strip 1"x9". It is to be
used as a 1/4 wave strip line in the output of an amplifier I'm building. I
dimly remember reading an article once describing the use of exhausted
black and white photographic fixer as the electrolyte for silver plating.
I do a bit of photograhy and have old fixer available. The fact I can't
find the article only made me determined to figure out what the method
outlined was. I have played around a bit and found that I can sucessfully
deposit a nice even coat of silver on a piece of brass. My problem is mixed
results getting the silver to adhere well. I have managed to get
what I'd consider proper plating on an object, but later using the same
parameters the silver film can be rubbed off. I have played with varing voltag
es,
currents, and methods of cleaning the brass prior to plating. Here are the
parameters I'm using:
1) Voltage source is a 1.5v dry cell.
2) Series resistance of 12k in circuit giving a current flow of 1 milliamp
        or so.
3) Fixer saturated by loading it up with old photographic paper prior to
        plating.
4) Silver donor is an old piece of solid silver silverware.
5) Cleaning the brass with a scotch-brite pad then wiping down with alcohol
        to de-grease.

Using the above, I can get a wonderful even deposit of silver. As I wrote
above the only problem is with the silver being bonded well to the
brass item. Probably half the time things work well, the other times not so
well. Mr Murphy allows me to plate a scrap perfectly but the item I need to
plate is giving me fits. Any ideas, suggestions or even pointing and laughing
in my direction are welcome.

Allen kb5sqk


From Unknown Mon Jan 01 01:10:51 1996
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From: [e-mail] (Phil Bunch)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ECP/EPP bidirectional PC parallel ports
Date: 31 Dec 1995 22:13:56 GMT
Organization: -=MO.NET=- MVP-Net, Inc's Missouri Operations
Lines: 35
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References: <4bck80$[e-mail]>
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Johan Forrer ([e-mail]) wrote:
: Hi all,

: Does anyone perhaps know how to use/program the new ECP/EPP parallel
: ports that one see nowadays on PC parallel interface cards?

: I understand that they support the older nybble-based printer standard,
: but in addition also support a full bidirectional interface, which of
: course will make them that much more attractive for interfacing to
: ham-radio projects.

: Any information or pointers would be much appreciated.

: --Johan Forrer, KC7WW


Hi Johan,

I seem to remember seeing an article this past summer in
Micro Computer Jornal (formerly Computer Craft).  I think
I have the correct name for the magazine, if not I'm sure
I'll be corrected...   :)

BTW, enjoyed your presentation here in St. Louis back in
the spring.

Hope this helps,

--
Phil Bunch   N0MFC

[e-mail]
   or
[e-mail]