World of Ham Radio 1997/WOHR97_AmSoft_(1997-02-01).iso/usenets/1996_08/_homebre.txt

Text File | 1997-02-01 | 482KB | 10,720 lines

The World of Ham Radio CD-ROM



From [e-mail] Mon Aug 05 11:39:45 1996
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From: Nuno Sucena Almeida <slug@algures-pt>
Newsgroups: rec.radio.amateur.homebrew
Subject: CB 2 10meters
Date: Wed, 31 Jul 1996 23:39:08 +0000
Organization: Aeminium BBS
Lines: 17
Message-ID: <sqqot4.j5.ln@localhost>
NNTP-Posting-Host: ppp01.dei.uc.pt
X-Newsreader: TIN [version 1.2 PL2]

Hello... could someone tell me were can i find the plans of
a Guaranty 4000 CB Radio ? I would like to convert it to 10 meters
operation...

Answers in this group or [e-mail]

bye

Nuno Sucena
[e-mail]    [e-mail]       [e-mail]
http://www.ci.uc.pt/~slug/      http://www.aeminium.pt/~slug/
CT1FOX CQG9304 CQM9228          Eng.Electrote'cnica FCTUC







From [e-mail] Mon Aug 05 11:39:46 1996
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From: Ken Bessler <[e-mail]>
Newsgroups: rec.ham-radio.swap,alt.radio.scanner,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,fidonet.ham,rec.ham-radio,rec.ham-radio.packet,rec.ham-radio.swap,slac.rec.ham_radio,su.org.ham-radio,swb.lists.linux.hams,rec.radio.swap,tnn.radio.amateur,uwarwick.societies.amateur-radio
Subject: Re: homepage revised
Date: Thu, 01 Aug 1996 00:28:24 -0500
Organization: Design Services Company
Lines: 9
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ict05.southwind.net
Mime-Version: 1.0
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To: Dave Booth <[e-mail]>
Xref: news2.epix.net alt.radio.scanner:32458 rec.radio.amateur.antenna:23476 rec.radio.amateur.digital.misc:16629 rec.radio.amateur.dx:161 rec.radio.amateur.equipment:31447 rec.radio.amateur.homebrew:16306 rec.radio.amateur.misc:105668 rec.radio.amateur.policy:35734 rec.radio.amateur.space:7369 fidonet.ham:8 slac.rec.ham_radio:63 su.org.ham-radio:294 swb.lists.linux.hams:14 rec.radio.swap:70935 tnn.radio.amateur:68 uwarwick.societies.amateur-radio:27

Dave Booth wrote:
>
> I just revised my homepage if you want to check it out.
> new stuff!
> --
> Dave Booth
>  kc6wfs

I am always ready to surf....However I do need a URL....:-)


From [e-mail] Mon Aug 05 11:39:47 1996
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From: [e-mail] (Charles Curtis)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re:  RF design problem?
Date: 1 Aug 96 02:41:29 GMT
Organization: ucsd usenet gateway
Lines: 40
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

> From: [e-mail] (Workshop)
> Subject: rf design problem?
>
> Hi there
> Is there anyone who can help me figure out a problem concerning a design tha
t I have
> seen in a book.You will need to have the book to help me.
> The book is RF CIRCUIT DESIGN by CHRIS BOWICK.
> On page 159 there is a diagram and design of a 15W 100MHz amplifier.
> I understand the input and output matching that he has done,but where did he
 get
> the 310 ohm resistor and the 1uH coil that are connected to the collector of
 the transistor
> from.These are also in parallel with the output of the transistor and I woul
d assume affect
> the matching network.These don't seem to have been taken into account.
> Any help appreciated
> Cheers
> Robin
> email : [e-mail]

Robin,

The 310 ohm resistor is used as a coil form for the 1 uH coil
(see the circuit and description for L5 on page 152 as an
example of this).  Keep in mind that carbon resistors are not
resistors at 100 Mhz.  The idea is to use the parasitic capacitance
of the "resistor" and the parallel, 1 uH, inductance as a resonanant
tank at 100 Mhz.  The "resistor" doubles as a coil form.  When
resonated this way, the high impedance of the tank is transparent
to the matching network and effectively decouples the power supply
from the amplifier output.  In addition, at lower frequencies where
the transistor has higher gain, the now non-resonant tank has a
low impedance.  This helps to prevent parasitic oscillations at
undesired frequencies, that can otherwise occur, by loading the output.

This is not mentioned in the example anywhere, so I see why
you may be perplexed.

73 de Chuck

  *********** Vote Harry Browne, Libertarian for President *******
amprnet: [e-mail]           internet: [e-mail]
ax25   : n2ucn@wa2soc.#nnj.nj.usa.na     internet: [e-mail]


From [e-mail] Mon Aug 05 11:39:48 1996
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From: Dave Booth <[e-mail]>
Newsgroups: rec.ham-radio.packet,alt.radio.scanner,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,fidonet.ham,rec.ham-radio,rec.ham-radio.packet,rec.ham-radio.swap,slac.rec.ham_radio,su.org.ham-radio,swb.lists.linux.hams,rec.radio.swap,tnn.radio.amateur,uwarwick.societies.amateur-radio
Subject: Revised Homepage URL
Date: Thu, 01 Aug 1996 10:20:54 -0700
Organization: KC6WFS
Lines: 8
Message-ID: <[e-mail]>
NNTP-Posting-Host: 165.113.223.131
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Sorry for not having the url in there....
http://www.geocities.com/Hollywood/5860

Enjoy!!!!!

dave booth kc6wfs
[e-mail]
[e-mail]


From [e-mail] Mon Aug 05 11:39:49 1996
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From: [e-mail] (Bob Duckworth)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.swap
Subject: Triad TY84 inverter transformers with docs for sale.
Date: 1 Aug 1996 12:32:21 -0400
Organization: Mark Horton Associates
Lines: 27
Distribution: na
Message-ID: <4tqm6l$[e-mail]>
NNTP-Posting-Host: ka4ybr.netmha.com
Xref: news2.epix.net rec.radio.amateur.homebrew:16316 rec.radio.swap:70978

I have about a dozen of these left after offer to
boatanchors group.

They were designed for inverters for mobile tube type gear and
are in excellent condition woth application notes.

DC input 12.6 volts
DC output 600volts at 200ma
Average switching frequency 2500Hz

Ap note uses a pair of PNP transistors some caps and some resistors.

Transformer has CT primary for 12.6volt
Dual primary that can be wired CT or bucked with primary for
switching bases.
Dual secondary that can be wired CT or parallel depending on needs.

$10//each plus shipping.

US Priority mail $3 for one $6 for two $8 for 3 $10 for 4.


--
Bob Duckworth Consulting, 960 Ralph McGill Blvd. Atlanta GA 30306-4447
bobs' address is [e-mail]    404-888-0389(V) 892-2301(FAX)
Buy Sell Trade Surplus Computer Electronics Datacom Telecom since 1981.
Fax or email your list for a fast cash offer. Watch for listserv catalog.


From [e-mail] Mon Aug 05 11:39:50 1996
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From: [e-mail] (Joe Landis - Systems & Network Mgr)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment
Subject: Data sheet for OKI klystron???
Message-ID: <1996Aug1.125506.591@main03>
Date: 1 Aug 96 12:55:06 EST
Distribution: world
Organization: North American Drager - Telford, PA
Lines: 8
Xref: news2.epix.net rec.radio.amateur.homebrew:16313 rec.radio.amateur.equipment:31455

Anyone have a data sheet for an OKI 55V10 Klystron? Based on the WR15 flange
it looks like its output is somewhere in the 50-75ghz range.

73!
Joe - AA3GN
--
[e-mail] - speaking only for myself, of course
No, this is not a sig.


From [e-mail] Mon Aug 05 11:39:54 1996
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From: "Ian White, G3SEK" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Suggested IF frequencies
Date: Thu, 1 Aug 1996 15:59:34 +0100
Organization: IFW Technical Services
Lines: 54
Distribution: world
Message-ID: <[e-mail]>
References: <4tk4pb$[e-mail]>
 <[e-mail]> <4tlro3$[e-mail]>
 <Ks8aDKAi2v$[e-mail]> <4tofra$[e-mail]>
NNTP-Posting-Host: ifwtech.demon.co.uk
X-NNTP-Posting-Host: ifwtech.demon.co.uk
MIME-Version: 1.0
X-Newsreader: Turnpike Version 1.12 <9qI82xurdT5+z2vSgnCPFcKgQL>

Robert Everitt Heiss wrote:
>In article <Ks8aDKAi2v$[e-mail]>,
>Ian White, G3SEK <[e-mail]> wrote:
>>
>>The "classic" design which does invert sidebands is a VFO in the 9.0-
>>9.5MHz region with a home-made 5MHz filter using surplus FT243 crystals
>>in cascaded half- or full lattices. These xtals were available in the
>>5MHz region, but not as high as 9MHz.
>
>Yes, but your "classic" rig doesn't tune backward on 75m.  Gary's does.
>And you might want to move your IF up a couple hundred kc ...

OK, we're getting there slowly. What Gary said was:

>(note tuning is backwards on 75m and sidebands invert, this is the
>historical reason why 75m uses LSB and 20m uses USB).

 - but as KO6KA pointed out, the sidebands from a 9MHz SSB generator
actually don't invert between 75m and 20m, they have to be deliberately
switched. So we can agree on: "tuning is backwards on 75m, and IF the
sidebands are also inverted, the rig tunes the same way on both bands".

Well and good... but that can't be the whole answer, because the USB/LSB
split actually pre-dates the 9MHz SSB exciters.

As Wes, N7WS pointed out, the original 9MHz phasing exciters came
*after* the earlier filter rigs which generated SSB at 455kHz or lower.
9MHz phasing became popular as a result of influential articles in 1950
and 1956, and 9MHz filters didn't appear until about 1960.

Note also that these were transmitters only. Receivers were separate at
that time, and they tuned the same way on all bands. Therefore they had
to be tuned in *opposite* directions to resolve LSB on 75m and USB on
20m.

A 1950 QST article by W1DX on 'How To Tune In a Single-Sideband Signal'
gives an LSB example at 75m. This and other QST reprints in the 1962
edition of ARRL's 'Single Sideband for the Radio Amateur' clearly show
that the USB/LSB split was in place well before 1960 (which is also
where my personal memories of SSB begin).

The real answer probably lies in pre-1950 QSTs - possibly the original
articles reporting the "opening" of first 75m and then 20m by Villard,
W6QYT at the Stanford club station W6YX in 1947.

That's as far as I can take it. My late father-in-law's 1950 ARRL
handbook gives a list of the earlier QST references, so does anybody
want to look them up?


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


From [e-mail] Mon Aug 05 11:39:58 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Suggested IF frequencies
Date: 1 Aug 96 17:24:11 GMT
Organization: ucsd usenet gateway
Lines: 30
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

In article <4tk4pb$[e-mail]> [e-mail] (Zack
Clobes) writes:

> I'm building a 20M tranceiver with SSB/CW receiver. I'm looking at a
> dual conversion but am unsure of which IF's to use. I found a
> digital VFO to use with it which will tune from 0-10MHz with no
> problems and is capable ot tuning up to 20MHz. Considering
> availability of filters and ease of contruction, what factors should
> be considered when selecting the IF?

Other than filter availability - check the surplus stores for big bags
of microprocessor clock crystals (not to mention colour burst crystals
and the like), as well as available prepackaged filters - other issues
for choosing an IF are related to feedthrough and spurious responses.

As an example, an IF of 7200 kHz would be one to avoid, due to 41
meter shortwave broadcasters getting into the IF. An IF that is
harmonically related to other oscillators in the radio is one to
approach cautiously. What's on the image frequency? Can you filter it?
Check for spurious responses in the IF, like 3rd and 5th harmonics of
the VFO mixing with things.

Tune around with a general coverage receiver. Check the frequency
allocation tables. Above all, have fun and keep us posted!

Laura Halliday VE7LDH         "C'est une femme mutine, assez
[e-mail]           elegante, grave et legere, ayant le
[e-mail]               sens du confort et du plaisir
Locator: CN89mg                en tout." - C. Deneuve



From [e-mail] Mon Aug 05 11:39:59 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Help needed with small broadcast type plastic variable caps
Date: Thu, 01 Aug 1996 23:51:47 GMT
Organization: CampusMCI
Lines: 15
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: s11-pm01.pcc-uky.campus.mci.net
X-Newsreader: Forte Agent .99e/32.201

Hi all,

Could someone tell me how to sort out the little plastic variable
caps? It is the usual type that  has 3 commons, 4 trimmers, and a
total of  6 leads from the edges. I want to build a tiny T-match tuner
similar to the 'QRP Delight'  from 73 magazine and don't know what
goes to what with these caps. I can measure capacitance with an Autek
RF analyst, but I just can't figure out the sections. The leads are
not marked O C A for oscillator, capacitor, and antenna,

Thanks in advance and 73,

Roy  KE4KDT




From [e-mail] Mon Aug 05 11:40:00 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!nntp.primenet.com!newsfeeder.sdsu.edu!news.sgi.com!news.msfc.nasa.gov!newsfeed.internetmci.com!tir.com!news
From: "Bill C." <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna,rec.radio.amateur.equipment
Subject: Re: Distance
Date: Fri, 02 Aug 1996 14:08:30 -0700
Organization: The Internet Ramp
Lines: 10
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: an44ow.tir.com
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A Guy named Moe wrote:
>
> I am wondering what is the main factor in deturmaning the distance that
> a signal my be sent quickly and with clear reception?
>
> thanks

The *main* factor is the receiver.

        Bill  KU8H


From [e-mail] Mon Aug 05 11:40:01 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news-in.tiac.net!news.kei.com!newsfeed.internetmci.com!tir.com!news
From: "Bill C." <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: SPELLING PLEASE
Date: Fri, 02 Aug 1996 14:27:49 -0700
Organization: The Internet Ramp
Lines: 18
Message-ID: <[e-mail]>
References: <4t8quj$[e-mail]> <4tfkmo$[e-mail]> <[e-mail]> <4tqesp$[e-mail]>
NNTP-Posting-Host: an44ow.tir.com
Mime-Version: 1.0
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Children. children!!

This is approaching the combustion point!! The original post was
nitpicking about "reciever" being mis-spelled. I wonder if anybody would
really be confused by "reciever" and wonder if instead of a detection
device it referred to a special dipole antenna or a bar of soap!!

There is already a "code endorsement" on some ham licenses. The general
code endorsement is 13 wpm as is the advanced. The extra is endosed at 20
wpm and some of the other license classes have specific endorsements of 5
wpm.

Lighten up a bit. If you're going to use CW prosigns on *TTY* try to use
them correctly before you complain about spelling.

         73,

         Bill  KU8H


From [e-mail] Mon Aug 05 11:40:02 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: FS HomeBrew amp parts & tubes (0/1)
Date: 3 Aug 1996 01:44:25 GMT
Organization: Illuminati Online
Lines: 8
Message-ID: <4tuatp$[e-mail]>
NNTP-Posting-Host: dialup-01-090.austin.io.com
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

See attachment;

Matthew A. Erickson
Paige,TX. (consult Rand Mcnally)
INTERNET ADDRESS;  [e-mail]

"EVERYONE, is entitled to their OWN, opinion, BUT, that does not mean I'm
REQUIRED, to listen to it !"


From [e-mail] Mon Aug 05 11:40:06 1996
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From: [e-mail]  (Bill Newkirk)
Newsgroups: in.ham-radio,ott.events,ott.general,rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: Any cool amateur radio online?
Date: 3 Aug 1996 14:20:22 GMT
Organization: Space Coast Amateur Technical Group
Lines: 23
Message-ID: <4tvn76$[e-mail]>
References: <4tohpk$89s$[e-mail]> <[e-mail]>
Reply-To: [e-mail] (Bill Newkirk)
NNTP-Posting-Host: netport-33.iu.net
X-Newsreader: IBM NewsReader/2 v1.2.5
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In <[e-mail]>, "Bill C." <[e-mail]> writes:
>If you mean you are looking to replace an antenna and receiver to listen
>to the ham bands there are probably legal restrictions blocking the way.
>While it may not always be illegal, it usually would be illegal and most
>of us won't be connecting our radios directly to the net.
>      Bill KU8H

uh, why would LISTENING to a radio be illegal? it might be an interesting
idea to set up banks of remotely controlled receivers that could be listened t
o
with one of the "real time audio" formats...

(<sheesh> <grumble> extra class ham telling people that it's illegal to listen
to amateur radio when we don't have an "privacy" protection - specifically
stated in the various rules and regs...if anything we could use more people
discovering amateur radio and what it is today instead of those 1950's/1960's
Q&A manuals that are stuck on the average library shelf for those few who are
interested enough to look something up on the subject..)

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 [e-mail] Mon Aug 05 11:40:06 1996
Path: news2.epix.net!news
From: "Brian D. McKinley, Ph.D." <[e-mail]>
Newsgroups: in.ham-radio,ott.events,ott.general,rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: Any cool amateur radio online?
Date: Sun, 04 Aug 1996 12:48:28 -0700
Organization: epix.net
Lines: 29
Message-ID: <[e-mail]>
References: <4tohpk$89s$[e-mail]>
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Xref: news2.epix.net in.ham-radio:256 ott.events:6340 ott.general:26370 rec.radio.amateur.equipment:31503 rec.radio.amateur.homebrew:16323

Christina Craft wrote:
>
> I've been looking endlessly for some cool amateur radio broadcasts
> (preferably live stuff) on the net. I realize the technology is
> still fairly expensive so it's hard for people to broadcast on
> RealAudio or Streamworks but I'm interested in hearing some stuff
> out there.
>
> If you know of places where I can find this kind of live broadcast
> I'd really appreciate being pointed to it.
>
> I've done countless searches and must be putting in the wrong key
> words.
>
> Is anyone out there doing some amateur stuff or is it mostly the
> mainstream doing online live broadcasts?
>
> Your help is appreciated
>
> email to [e-mail]
>
> Cheers!Why would you want to use a computer and an internet provider to
something that is available in free space.  There are several modestly
priced receivers on the market (less than you pay for a year's net
connection).

The Whole World is yours instead a little "cool stuff".

[e-mail]


From [e-mail] Mon Aug 05 11:40:07 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.fibr.net!nntp.primenet.com!news1.best.com!news.texas.net!news.kei.com!newsfeed.internetmci.com!tir.com!news
From: "Bill C." <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ISO design ideas for power 14 MHz sine generator
Date: Sun, 04 Aug 1996 15:06:17 -0700
Organization: The Internet Ramp
Lines: 5
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: an19ow.tir.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0 (Win16; I)

Start by looking at the smaller power FETs. You may have some stability
problems at the power levels you want. Might be better off with a lower
power oscillator and follow it with your 28 volt power stage.

     Bill  KU8H


From [e-mail] Mon Aug 05 11:40:08 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-ana-7.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!cs.utexas.edu!swrinde!news-res.gsl.net!news.gsl.net!nntp.coast.net!news.kei.com!newsfeed.internetmci.com!news.io.com!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: FS Homebrew amp parts & tubes. (0/1)
Date: 4 Aug 1996 16:32:53 GMT
Lines: 10
Message-ID: <4u2jbl$[e-mail]>
NNTP-Posting-Host: dialup-01-036.austin.io.com
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

Please read this attachment;



Matthew A. Erickson
Paige,TX. (consult Rand Mcnally)
INTERNET ADDRESS;  [e-mail]

"EVERYONE, is entitled to their OWN, opinion, BUT, that does not mean I'm
REQUIRED, to listen to it !"


From [e-mail] Mon Aug 05 11:40:10 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-ana-7.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!cs.utexas.edu!swrinde!news-res.gsl.net!news.gsl.net!nntp.coast.net!news.kei.com!newsfeed.internetmci.com!news.io.com!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: FS Homebrew amp parts & tubes. [hombrw.txt] (1/1)
Date: 4 Aug 1996 16:32:59 GMT
Lines: 31
Message-ID: <4u2jbr$[e-mail]>
NNTP-Posting-Host: dialup-01-036.austin.io.com
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

begin 644 HOMBRW.TXT
M2&]M96)R97<@<&%R=',[#0HH,BD@,T-8,3(P,"!$+3<@='5B97,L(#$@=VET
M:"`R,"!H;W5R<R!U<V4L(#$@=VET:"`P(&AO=7)S($Y)0B`@("0T,#`@96%C
M:`T**#$I(#,U+34P,'!F(#5+5B!J96YN:6YG<R!V86-U;2!V87)I86)L92!C
M87`N('=I=&@@='5R;G,@8V]U;G1E<BP@*&=O;V0@9F]R($,M,2D@("0Q,#`-
M"B@Q*2`Q-2TR,#`P<&8@,TM6(&IE;FYI;F=S('9A8W5M('9A<FEA8FQE(&-A
M<"X@=VET:"!T=7)N<R!C;W5N=&5R+"`H9V]O9"!F;W(@0RTR*2`D,3`P#0HH
M,2D@4&5T97(@1&%H;"!P;&%T92!T<F%N<V9O<FUE<B`@,C(P+3(T,'9A8R!P
M<FEM87)Y+"`R,#`P+3(T,#`M,S`T,"!S96,N($`@,2!A;7`N($-#4PT*;F5A
M<FQY(&YE=RP@9W)E870@8V]N9'@L(#0V(&QB<RX@("0R,C`-"B@Q*5!E=&5R
M($1A:&P@9FEL:6UE;G0@=')A;F9O<FUE<B`V+C-V86,@=VET:"!C96YT97(@
M=&%P($`@,S`@86UP<RX@0T-3("AG;V]D(&9O<B`S0U@Q,C`P($0M-R!T=6)E
M<RD@("0V,`T**#(I($IE;FYI;F=S('9A8W5M(')E;&%Y<R`R-BXU=F1C(%-0
M4U0L("AU<V4@:6X@=&%N9&5M(&9O<B!4+U(@<F5L87DI("0U,"!E86-H+@T*
M*#$Q*2!-86QL;W)Y(#@P,&UF(#0U,'9D8R!E;&5T<F]L:71I8R!C87!S+B!N
M96%R;'D@;F5W+"`D,3`@96%C:"!O<B`D,3`P(&9O<B!A;&P@=VET:"`W,VL@
M8FQE961E<B!R97-I<W1O<G,N#0HH,2D@1&%Y=&]N(")S<75I<G)E;"!C86=E
M(B!B;&]W97(L(#$P,&-F;2`Q,3!V86,L("XW-2!A;7`N("0Q,"X-"B@R*2!%
M24U!0R!32RTT,3`@='5B97,@<V]C:V5T<R`H<VQI9VAT;'D@;6]D:69I960I
M("0Q,"!E86-H+@T**#0I($LR05<@(G-I;&EC;VX@86QL97DB(&1I;V1E(&UO
M9'5L97,@(#9+5B!`(#$@86UP+B!#0U,@("0U+@T**#$I(&9I;&5M96YT(&-H
M;VME(&-A;B!H86YD;&4@,S`@86UP<RX@86,@,38P+3$P;71R<R`@)#$P+@T*
M*#0I(&)A;F0@<W=I=&-H97,@<VEN9VQE('!O;&4L('-I;F=L92!G86YG+"!V
M97)Y(&QA9W)E+"!H86YD;&4@;&]T<R!O9B!P;W=E<BP@-2!P;W-I=&EO;G,L
M("0Q,"!E86-H+@T**&UA;GDI(")$;V]R:VYO8B(@8V%P<RX@;V8@=F%R:6]U
M<R!V86QU97,@)B!V;VQT86=E<RP@12UM86EL('=I=&@@>6]U<B!N965D<RP@
M22=L;"!S964@:68@22!H879E(&ET+B`@)#,@96%C:"X-"@T*12UM86EL(&UE
M(&EF('EO=2!N965D(&UO<F4@:6YF;R!O;B!A;GD@:71E;2P@04Q,('!R:6-E
4<R!I;F-L=61E<R!S:&EP<&EN9RY
`
end


From [e-mail] Mon Aug 05 11:40:11 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-pen-4.sprintlink.net!news.sprintlink.net!news-pen-14.sprintlink.net!newsfeed.internetmci.com!uwm.edu!lll-winken.llnl.gov!enews.sgi.com!news.uoregon.edu!vixen.cso.uiuc.edu!newsfeed.ksu.ksu.edu!hptemp1.cc.umr.edu!sidener
From: [e-mail] (Scott Sidener)
Newsgroups: rec.radio.amateur.homebrew
Subject: Please Help with 10GHz Microwave Gunn Diode Assembly
Date: 4 Aug 1996 22:24:23 GMT
Organization: UMR Missouri's Technological University
Lines: 29
Message-ID: <4u37un$[e-mail]>
NNTP-Posting-Host: crunch.nuc.umr.edu
X-Newsreader: TIN [version 1.2 PL2]

Hi, I need some help fixing a Microwave Associates 10GHz Gunn diode
assembly.

the model is :   MA 86656 CM

I have two of them and I am trying to make a amateur data link but one of
them has no output when I apply the voltage to the diode.  I noticed
something rattling around inside the assembly so I took out the plunger
which holds the Gunn diode and found that it had slipped out of it's
holder (probably from being dropped).  I replaced the diode in the holder
and tried to fire up the assembly again.  Still no output.  I do not know
which way the diode goes in so I tried both directions (there are no
markings on the diode)  Still no output.

I can only assume that the diode is bad, but I have no idea how to find
another.  It has no numbers.

If anyone has any specs or advice on obtaining another Gunn diode or the
correct orientation, I would appreciate any help I could get.

I was told that one of these assemblies cost around $500 new, and I don't
have that kind of "hobbie" money avaliable. So I would like to fix the
one I have.

Thanks,

Scott Sidener   N0WFL
[e-mail]



From [e-mail] Mon Aug 05 11:40:12 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-ana-24.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!news.infi.net!newsfeed.direct.ca!op.net!hunter.premier.net!news-res.gsl.net!news.gsl.net!swrinde!cs.utexas.edu!news.ti.com!usenet
From: Joe Fitter BV/N0IAT <[e-mail]>
Newsgroups: in.ham-radio,ott.events,ott.general,rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: Any cool amateur radio online?
Date: Mon, 05 Aug 1996 13:21:55 -0700
Organization: Texas Instruments Asia, Taiwan ROC
Lines: 36
Message-ID: <[e-mail]>
References: <4tohpk$89s$[e-mail]> <[e-mail]> <4tvn76$[e-mail]> <[e-mail]>
NNTP-Posting-Host: na01872244.taiwan.ti.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.02 (Win16; I)
To: "Eric M. Brombaugh" <[e-mail]>
Xref: news2.epix.net in.ham-radio:257 ott.events:6341 ott.general:26373 rec.radio.amateur.equipment:31512 rec.radio.amateur.homebrew:16327

Eric M. Brombaugh wrote:
>
> In article <4tvn76$[e-mail]>, [e-mail] (Bill Newkirk) wrote:
>
> > it might be an interesting idea to set up banks of
> > remotely controlled receivers that could be listened to
> > with one of the "real time audio" formats...
>

> Using this config, anyone with a web browser could grab my scanner and liste
n
> to what's in the air in Phoenix.  Now the question is "Who cares?"  Plus,
> I'd have to set up a web server on my Mac, leave it running and on the net
> all day.  Sounds like a project for someone with an existing server.
>
> Interesting idea though.

Another thought -- just use IPHONE.  Although it would be a 1-at-a-time
deal, it would be easy to do.   FWIW, I've been talking to a group of
hams back in the USA via IPHONE and some control software called
REPEATER LINK.  I can even access their repeater phone patch using a
midi DTMF simulator to place local calls to my folks.  Of course, this is
not exactly private since the call goes over the repeater, but it sure beats
paying 3 bucks per minute for a quick phone call back to the states.

Talked with some other guys using CW via iphone....sure works better since
propagation is lousy.

Lots of neat applications using IPHONE....check them out.

73,  Joe    dit dit
----------------------------------------------------------
Amateur Radio:  BV/N0IAT   Taipei TAIWAN Republic of China

ex.  7J1AOF (Japan)  YU3/N0IAT (Slovenia)  KA0ZDH (Novice)
Licensed Radio Amateur since 1986.  Comments are mine only.
----------------------------------------------------------


From [e-mail] Sun Aug 11 05:50:38 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news-res.gsl.net!news.gsl.net!news.uoregon.edu!arclight.uoregon.edu!netnews.worldnet.att.net!ix.netcom.com!tor-nn1.netcom.ca!news
From: [e-mail] (radiocc)
Newsgroups: rec.radio.amateur.homebrew
Subject: 2M repeater project
Date: 10 Aug 1996 20:14:50 GMT
Organization: Infinity Online Services
Lines: 16
Message-ID: <4uiqjq$[e-mail]>
NNTP-Posting-Host: trt-on7-30.netcom.ca
Mime-Version: 1.0
X-NETCOM-Date: Sat Aug 10  4:14:50 PM EDT 1996
X-Newsreader: WinVN 0.93.14

        Well, I am going to starting a college project soon, for my
Electonics Technologist Course. What I am proposing to build is a VHF
repeater. To start off with just a very basic system. Then as time
permits, to continue to enhance it, with higher power, phone patch, and
voice messaging.
        What I am looking for, is any information on building a system,
Transiever, and power supply, maybe a kit, or documentation. Anything
that might help me get the basic system done quickly, to try and dedicate
more time to the features.
        I have just started to preform my research, so any information
that you have would be appreciated, anything at all. I have 6 months to
complete this project, PCB'ed, documented, and functioning within this
time limit, so time is of the essence.
        Thanks in advance to all!
                        Mike Russell



From [e-mail] Sun Aug 11 05:50:39 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!EU.net!main.Germany.EU.net!fu-berlin.de!informatik.tu-muenchen.de!lrz-muenchen.de!news.unibw-muenchen.de!bauv111!claude
From: [e-mail] (Claude Frantz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 4-1000A Amp Schematics Wanted
Date: 9 Aug 96 08:20:01 GMT
Organization: University of the Federal Armed Forces Munich
Lines: 34
Message-ID: <claude.839578801@bauv111>
References: <4uaqu1$[e-mail]> <claude.839495464@bauv111>
Reply-To: [e-mail]
NNTP-Posting-Host: bauv111.bauv.unibw-muenchen.de
X-Newsreader: NN version 6.5.0 #3 (NOV)

[e-mail] (Claude Frantz) writes:

>[e-mail] (Del Packard) writes:

>>      Desperately looking for any help I can get on building an amplifier
>>out of my 4-1000a tube that I picked up at a hamfest.  Thanks... WH6EQ

>You can use the schematics of a lower power amplifier and you have to adapt
>the components. There is no fundamental difference to ampliers using a
>4-125A or a 4-400A or such a tube.

There is additional data according to Varian:

Heater: 7.5 V, 21 A

Class C CW
Va= 4 kV, Vg2= 500 V, Vg1= -150 V
Ia= 700 mA, Ig2= 137 mA, Ig1= 39 mA
Wdrive= 12 W, Wout= 2100 W

Class B SSB GG (g1 and g2 grounded)
Va= 4 kV
Ia= 120 to 670 mA, Ig2= 0 to 80 mA, Ig1= 0 to 150 mA
Wdrive= 105 W, Wout= 1870 W

Class AB1 SSB
Va= 4 kV, Vg2= 1 kV, Vg1= -130 V
Ia= 170 to 480 mA, Ig2= 0 to 40 mA
Wout= 1130 W
--
Claude
([e-mail])
The opinions expressed above represent those of the writer
and not necessarily those of her employer.


From [e-mail] Sun Aug 11 05:50:40 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.scott.net!acara.snsnet.net!news5.crl.com!nntp.crl.com!howland.reston.ans.net!newsfeed.internetmci.com!in3.uu.net!EU.net!main.Germany.EU.net!fu-berlin.de!informatik.tu-muenchen.de!lrz-muenchen.de!news.unibw-muenchen.de!bauv111!claude
From: [e-mail] (Claude Frantz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 4-1000A Amp Schematics Wanted
Date: 8 Aug 96 09:11:04 GMT
Organization: University of the Federal Armed Forces Munich
Lines: 16
Message-ID: <claude.839495464@bauv111>
References: <4uaqu1$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: bauv111.bauv.unibw-muenchen.de
X-Newsreader: NN version 6.5.0 #3 (NOV)

[e-mail] (Del Packard) writes:

>       Desperately looking for any help I can get on building an amplifier
>out of my 4-1000a tube that I picked up at a hamfest.  Thanks... WH6EQ

You can use the schematics of a lower power amplifier and you have to adapt
the components. There is no fundamental difference to ampliers using a
4-125A or a 4-400A or such a tube. Note that you can use the 4-1000A
in GG mode too, although it is probably not the best tube for this mode.
Considering that this tube is often available at a good price, this can
even be a good reason to use it.
--
Claude
([e-mail])
The opinions expressed above represent those of the writer
and not necessarily those of her employer.


From [e-mail] Sun Aug 11 05:50:41 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!arclight.uoregon.edu!usenet.eel.ufl.edu!tank.news.pipex.net!pipex!hole.news.pipex.net!pipex!pipex-sa.net!atlas.infopta.co.za!rudix
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: 4CX250C/F Tubes
Date: 8 Aug 1996 06:37:55 GMT
Organization: pipex-sa.net
Lines: 15
Message-ID: <4uc203$[e-mail]>
NNTP-Posting-Host: 196.30.31.132
X-Newsreader: TIN [version 1.2 PL2]

Hello everyone,

I have been planning on building a 6m and a 2m amp using 4CX250B tubes,
I managed to get hold of some new 4CX250C/F tubes and I wonder if I can
use them. Are the different from the B's and if they are what is the
difference ?

Thanks for the info!

Cheers

Rudi

e-mail : [e-mail]
Packet : [e-mail]


From [e-mail] Sun Aug 11 05:50:42 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!nntp04.primenet.com!news.shkoo.com!nntp.primenet.com!news.texas.net!news.kei.com!newsfeed.internetmci.com!in3.uu.net!news.fyi.net!news
From: Robert Morris <[e-mail]>
Subject: Re: 4CX250C/F Tubes
X-Nntp-Posting-Host: dyn7.fyi.net
Content-Type: text/plain; charset=us-ascii
Message-ID: <[e-mail]>
Sender: [e-mail] (News User)
Content-Transfer-Encoding: 7bit
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References: <4uc203$[e-mail]>
Mime-Version: 1.0
Date: Sat, 10 Aug 1996 00:47:36 GMT
X-Mailer: Mozilla 2.01 (Win16; U)
Lines: 18

[e-mail] wrote:
>
> Hello everyone,
>
> I have been planning on building a 6m and a 2m amp using 4CX250B tubes,
> I managed to get hold of some new 4CX250C/F tubes and I wonder if I can
> use them. Are the different from the B's and if they are what is the
> difference ?
>
> Thanks for the info!
>
> Cheers
>
> Rudi
>
> e-mail : [e-mail]
> Packet : [e-mail]26 v filament...Will work fine...Wire it so
you can switch
fil xfmrs and use any of the series.....


From [e-mail] Sun Aug 11 05:50:43 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!nntp04.primenet.com!news.shkoo.com!nntp.primenet.com!news.cais.net!hunter.premier.net!insync!news
From: [e-mail] (erikc)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Are vapors from solder harmfull?
Date: Wed, 07 Aug 1996 03:46:36 GMT
Organization: bugshit.nutso.com
Lines: 26
Message-ID: <4u93ad$[e-mail]>
References: <4u83g4$[e-mail]>
NNTP-Posting-Host: dialup-164-127.insync.net
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Tim Shearer) wrote:

>>|I always find myself with my face right down near a circuit board trying to
>>|solder or un-solder some microsized surface mount part or something. I
>>|therefore breath a lot of solder/rosin smoke. Is this bad for your health?
>>|Is there lead in the smoke?

>>|Anyone know? Maybe others also are curious?

>>|Tim
 I would imagine so if your job was to sit there all day and assemble
or rework PC boards.  It is objectionable as hell, sorta like someone
blowing cigarette smoke in your face while you are eating.  Get any
kind of small fan (like a muffin fan) and arrange it to blow across
your work area.  I use a 12v fan out of an old PC power supply, and
run it on 5v.  It is quiet and the airflow is such that the fumes are
blown away, but the soldering iron is not cooled off by the airflow.

Hope this helps.

Erikc


Religious fundamentalists are a plague sent by God to
punish us for our joys. -- me



From [e-mail] Sun Aug 11 05:50:44 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-chi-8.sprintlink.net!realtime.net!news
From: Charles Wenzel <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Are vapors from solder harmfull?
Date: Tue, 06 Aug 1996 23:04:34 -0700
Organization: Real/Time Communications Internet customer posting
Lines: 19
Message-ID: <[e-mail]>
References: <4u83g4$[e-mail]>
NNTP-Posting-Host: jake-5n.ip.realtime.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-RTcode: f5b7ac8332628a8a29081466
X-Mailer: Mozilla 2.01 (Win16; I)

I doubt if there is much lead but the smoke is far from "healthy". Try
placing a small fan to one side. A slight breeze is all that is needed to
keep the smoke out of your face. You can even "whistle while you work"
(blow gently) while you solder. If you do a lot of soldering you may wish
to get a HEPA air filter or some ventilation for the room. More fancy
approaches include vacuum pickup devices - either a whole-bench pickup
similar to the hood on your stove or a little pipe at the tip of the iron
 with a vacuum system exhausting to the outside. We used the little pipe
technique for several years and it works great but the vacuum pump is
difficult to aquire and tended to get clogged with flux due to lots of
users. You can find suitable constant-duty pumps in some larger computers
or copiers at the local junk yard. They are used for forced-air cooling,
in most cases. I also have a computer fan mounted in a Bud box with a
vacuum cleaner hose. The fan "sucks" air into the box and out the hose.
Just place the box near the back of your work and away go the fumes out
the window (or hole in the wall, in my case)! Disregarding the health
factors, such a system is still worth making for your general comfort
level.
Charles


From [e-mail] Sun Aug 11 05:50:45 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newshub.csg.stercomm.com!newshub.itd.sterling.com!sparky!uunet!in3.uu.net!newsfeed.internetmci.com!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Are vapors from solder harmfull?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4u83g4$[e-mail]>
Date: Wed, 7 Aug 1996 14:50:52 GMT
Lines: 25

In article <4u83g4$[e-mail]> [e-mail] (Tim Shearer) wri
tes:
>I always find myself with my face right down near a circuit board trying to
>solder or un-solder some microsized surface mount part or something. I
>therefore breath a lot of solder/rosin smoke. Is this bad for your health?
>Is there lead in the smoke?

There shouldn't be any lead vapor in the smoke. Soldering temperatures
are well below the vaporization point of lead. There will be rosin fumes,
however, and they can irritate the eyes and lungs. Use a fan to keep the
fumes out of your face. I keep an ordinary 12 volt boxer fan on the
bench for this. There are commercial fume extractors available, but
the simple fan is usually sufficient.

The big lead danger is that some will rub off on your fingers while
you are handling the solder. This can then be ingested if you eat,
drink, smoke, or otherwise touch body openings without washing your
hands carefully first. Don't rub your eyes either. Obviously, don't
pull the old stunt of holding the solder in your mouth while you work.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | Due to provider problems
Destructive Testing Systems |    we break it.     | with previous uucp address
es
534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Sun Aug 11 05:50:46 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsfeed.internetmci.com!in3.uu.net!excelsior.flash.net!usenet
From: [e-mail] (Alan)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Are vapors from solder harmfull?
Date: 8 Aug 1996 14:41:41 GMT
Organization: Flash-Net Internet Service Provider, 888-FLASHNET
Lines: 22
Message-ID: <4ucub5$[e-mail]>
References: <4u83g4$[e-mail]>
NNTP-Posting-Host: 208.194.198.66
X-Newsreader: WinVN 0.99.8 (beta 2)

In article <4u83g4$[e-mail]>, [e-mail] says...
>
>I always find myself with my face right down near a circuit board trying to
>solder or un-solder some microsized surface mount part or something. I
>therefore breath a lot of solder/rosin smoke. Is this bad for your health?
>Is there lead in the smoke?
>
>Anyone know? Maybe others also are curious?
>
>Tim
At my job I work with solder wafting up into my face all day.
I did as the others have done, put a small fan to one side to
blow the fumes away.  A while back the company had some
guys come in a do air tests, they said there isn't enough
stuff in the air to be harmful, just be sure to wash your hands
before eating if you've been handling solder, and for God's sake
don't hold it in your mouth (as one of our less brilliant techs did
when both his hands were full).
73 -- Alan KJ5ZD
--
http://www.flash.net/~alandp/



From [e-mail] Sun Aug 11 05:50:47 1996
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From: [e-mail] (Just Me)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Are vapors from solder harmfull?
Date: Sat, 10 Aug 1996 05:00:15 GMT
Organization: Netcom
Lines: 23
Message-ID: <[e-mail]>
References: <4u83g4$[e-mail]> <[e-mail]>
NNTP-Posting-Host: den-co31-22.ix.netcom.com
X-NETCOM-Date: Fri Aug 09 10:00:18 PM PDT 1996
X-Newsreader: Forte Agent .99e/32.227

On Fri, 09 Aug 1996 01:15:32 -0500, Randy Smith <[e-mail]>
wrote:

>There are 3 dangers to soldering...
>  1) Being burnt!
>  2) Melting solder with an iron temperature above 800-850 degrees F
>(depending on tin/lead ratio), will cause the lead to be liberated in
>gaseous form. Not healthy to breathe!
>  3) Handling solder, then touching food that you eat. This will transfer
>lead from the solder to your fingers then on to your food... resulting in
>the direct ingestion of lead.
>
>  Randy Smith
>  KN4KB

Personally, I would worry more about the RF in the shack!  The average
Ham does not get enough exposure to flux fumes to cause much harm.

When you blow your nose, and the residue works well for flux, start
worrying :-)

Kevin N0OAS
"Let us all be gentlmen, for as it has been said,Blondes prefer gentlemen."


From [e-mail] Sun Aug 11 05:50:48 1996
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From: Randy Smith <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Are vapors from solder harmfull?
Date: Fri, 09 Aug 1996 01:15:32 -0500
Organization: Smith's Software
Lines: 11
Message-ID: <[e-mail]>
References: <4u83g4$[e-mail]>
NNTP-Posting-Host: stn32.cfw.com
Mime-Version: 1.0
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There are 3 dangers to soldering...
  1) Being burnt!
  2) Melting solder with an iron temperature above 800-850 degrees F
(depending on tin/lead ratio), will cause the lead to be liberated in
gaseous form. Not healthy to breathe!
  3) Handling solder, then touching food that you eat. This will transfer
lead from the solder to your fingers then on to your food... resulting in
the direct ingestion of lead.

  Randy Smith
  KN4KB


From [e-mail] Sun Aug 11 05:50:49 1996
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From: [e-mail] (Stephen Muther)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Commercial CW use
Date: 7 Aug 1996 12:27:50 -0700
Organization: BEST Internet Communications
Lines: 52
Message-ID: <4uaqnm$[e-mail]>
References: <4u5sl2$[e-mail]> <4u7o1o$[e-mail]> <4u8cko$[e-mail]> <[e-mail]>
NNTP-Posting-Host: shellx.best.com

In article <[e-mail]>,
Gary Coffman <[e-mail]> wrote:
>In article <4u8cko$[e-mail]> [e-mail] (Bob Duckwort
h) writes:
>>As I understand it Morse is the prescribed mode for satellite uplink
>>transmitters to id.
>>All uplinks are required to do this.
>>(commercial)
>
>No. We're required to encode our call sign in the vertical blanking
>interval in such a way that rolling the sync bar down allows it to
>be read off the monitor. Or we can use a specified digital encoding
>in the vertical interval instead (this has become the most common
>method and is more adaptable to automatic computer control of networks
>of uplink systems). We *cannot* use OOK because that would change
>the transponder saturation level and would cause interference to other
>signals being relayed.
>
>Commercial satellite transponders are operated with a specified
>saturation level. When we power up, the satellite control center
>will advise us to increase power until we reach the specified
>saturation level, and then hold it there so that we won't pump other
>signals using the transponder. (We watch that on the downlink spectrum
>analyzer in the truck anyway, but satellite control has the final word.)
>
>We can't use MCW on one of the sound subcarriers for the legal reason
>that we must continously ID our uplink signal (so that a source of
>double illumination can be identified immediately), and for the
>practical reason that we're using the subcarriers for program audio
>anyway.
>
>I'm not familiar with the ID requirements of SCPC or other data
>uplink systems, but they can't use OOK either, and I would opine
>that they embed their ID in the data framing (somewhat similar
>to amateur packet).
>
>Gary
>--
>Gary Coffman KE4ZV          |    You make it,     | Due to provider problems
>Destructive Testing Systems |    we break it.     | with previous uucp addres
ses
>534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
>Lawrenceville, GA 30244     |                     |

This is not entirely correct.  Videocipher encoded video on
satellite does use MCW on the audio subcarrier since VBI encoding
could only be seen by receivers with key authorization for that
particular service.  The FCC needed some way to ID the uplink
on encoded channels without actually having to subscribe to the
service.

Steve Muther WF6R




From [e-mail] Sun Aug 11 05:50:50 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsfeed.telalink.net!telalink!news.wildstar.net!news.sdsmt.edu!news.mid.net!newsfeeder.gi.net!newsfeed.internetmci.com!hunter.premier.net!news.cais.net!nntp04.primenet.com!news.shkoo.com!nntp.primenet.com!news.primenet.com!news.primenet.com!not-for-mail
From: [e-mail]
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.shortwave
Subject: Re: CORRECTION - FCC Ruling Will Require Some Hams to File Environmental Impact Reports
Date: 6 Aug 1996 11:38:01 -0700
Organization: Primenet Services for the Internet
Lines: 9
Message-ID: <4u83e9$[e-mail]>
References: <4u2uvk$[e-mail]> <4u644o$[e-mail]> <4u7s06$[e-mail]>
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I just want to know how to check if I comply or not. I downloaded the
PDF from the FCC, and the measurements listed there are WAY above me.
Is there a chart available for this?
I'm not too concerned because I only exceed 50W on 10M (100W), but
would still be interesting to know.


Rob Neff (N7ORY)



From [e-mail] Sun Aug 11 05:50:53 1996
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From: Frank Dinger <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: CW or not CW
Date: Tue, 6 Aug 1996 13:43:28 +0100
Lines: 32
Message-ID: <[e-mail]>
NNTP-Posting-Host: piccadilly.zetnet.co.uk
X-Mailer: ZIMACS Version 1.09u 10001740

> This is a bunch of cr*p. The "NO CODE" Tech has allowed the HAM numbers
> to grow. With growth comes more representation and business. What
> would happen if HAM numbers start to decline as they were in the
> past? There is safety in numbers regardless of how one obtains a
> HAM license. If you do not believe this just look at the recent
> FCC Bands on the selling block.

> I'm always amazed at this self-serving attitude. Regardless of anyones
> opinion the truth of the matter is that a "NO CODE" Tech exists
> today and was backed by a majority. How about coming down off the
> pedestal and joining the rest of us "Sub Standard People"!

> Gary-
============comments GM0CSZ / KN6WH
Fully support Gary's point of view
Although I very much enjoy CW and hope some spectrum will always be
left for CW operation , wanting to maintain the code requirement as a
requisite for access to the HF bands ,while code is no longer used by
the non-amateur community , highlights a dinosaur atttitude for which
IMHO is no longer place in today's world . Afterall it's 1996 ,  no
longer 1956.
Let those who wish to operate CW enjoy it ,but let's not force it
upon people who are interested in other aspects of our common hobby.
Let's all move forward in a real world. As a bonus we then will
possibly be able to keep the spectrum currently allocated to the
amateur service.

Frank Dinger , Inver by Tain , Ross-shire - Scotland UK
e-mail :  [e-mail]
Packet :  GM0CSZ @ GB7NOS.#76.GBR.EU




From [e-mail] Sun Aug 11 05:50:55 1996
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From: duane <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: CW or not CW
Date: Fri, 09 Aug 1996 01:44:06 -0400
Organization: personal
Lines: 67
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
Reply-To: [e-mail]
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Bill C. wrote:
>
> Hi Duane,
>
> Discussions like this tend to move to flames. I'll take my chance and
> exit if flames erupt. I regard flamers as dwelling in the depth of
> ignorance. Will not respond to any.
>
> CW is not gone from non-amateur services and is not used solely for
> repeater IDs, either. Actual messages are sent and received daily using
> cw. It appears that will be the case for a long time to come. People who
> would deny this have only to tune across the spectrum. So... CW isn't
> really dead.
>
> I held my extra class ticket all during the the no-code modifications to
> our rules. There were hot discussions about all the "dingbats" who would
> invade the ham bands. It was believed that cw was an infallible dingbat
> filter, keeping undesirable people out. I had to point out all those
> articles about FCC actions against jammers and other ne'er do wells in
> the ham ranks. Almost all of them were.... extra class licensees!! It
> seems the cw filter didn't actually work, either.
>
> I *KNOW* we have more yoyo's with ham licenses, but there are also many
> more hams. Probably about the same percentage of dingbats as always. I
> have observed many new no-code licensees take the initiative to learn the
> code so they could have more priveleges (nobody has "rights") and many
> who were happy to live on the FM repeaters forever. Most are good people.
>
> So... why should those who want more priveleges be required to learn CW?
> I had to learn about building and operating satellites (not just using
> them) and how to build and operate a repeater and other things that I
> intend *NEVER* to do when I wanted to upgrade to Extra. I have no
> complaint. I had to demonstrate knowledge of things I never intend to do
> as part of the "package" of priveleges I wanted. It didn't hurt a bit.
> Those techniques (satllites and repeaters) are current, but, as we have
> seen, so is CW. If you're happy with no-code priveleges (nobody has
> rights) then I'll see you on the repeaters. If you want more priveleges,
> then buckle down, meet the requirements (more than just CW) and I'll see
> you in even more places.
>
> There are as many varied interests in ham radio as there are hams. I'd
> never "waste my time" linking a lot of FM repeaters to increase the
> coverage area. But... I think it is a cool idea and applaud those who do
> it. I'd also defend their "privelege" to do so. I might even use the
> system some time. Enjoy your priveleges. Earn more if you want them. Take
> some time to appreciate what all those other cool people are doing.
> You'll get even more pleasure from the hobby.
>
>          Bill  KU8H

Hi Bill, your right these things do turn unto flames...Bill I think you
mis read what I said. I am an extra Class and have been so for 10 years
running. What I was saying is , it seems like it is the no code hams who
want to do away with the code all together.  I feel they would like to
remove the code portion of the bands all together to add more voice
FREQs. I don't think, there are that many people who learn the code to
13 wpm and upgraded to general who really want to do away with all code.
I truly believe if they did away with the code completely, the code
portion of the bands would also go too. Hey I like CODE ! And I really
think more people would too if they truly gave it a try. Not too many
kids like learning another Lang in high school either, but if they do
truly learn one, then it is of great help and you know it really isn't
all that bad once it is learn.

so 73's
Duane AB4BE
http://www.flinet.com/~duane


From [e-mail] Sun Aug 11 05:50:58 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.edu.tw!nctuccca.edu.tw!howland.erols.net!news1.erols.com!news
From: Jake Brodsky <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc
Subject: Re: Digital Microwave Radio
Date: Fri, 09 Aug 1996 10:25:21 -0700
Organization: Wheeeeee!
Lines: 26
Message-ID: <[e-mail]>
References: <4smur8$[e-mail]> <01bb75ff.88cf0700$[e-mail]> <[e-mail]> <4uaf53$[e-mail]>
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You'll get a T1 connection which you could attach to your router.

I hope you don't consider the school application too critical.
Remember, part 15 devices must put up with any interference they
receive.  Not only that, if you happen to interfere with anyone
else, you can be requested to shut down.

I have looked at the early lynx receivers.  What they do is add
their own PN code at about eight times the data rate.  That in
itself wouldn't be a big deal, except that the receive side is
wide open.  They use a very wideband discriminator to receive
the whole FSK PN+signal mess.  Then they digitally xor
themselves with the incoming PN signal.  It will work, until
some stronger signal appears anywhere in the passband. Then
the discriminator goes in to capture and you're screwed.

Lynx is relying on the very low activity in the 2 GHz band to get
away with this stupid trick.  That situation is likely to change
soon.  If you expect PCS to show up anytime soon, you had best
avoid this stuff...

73,
Jake Brodsky, mailto:[e-mail]
PP-ASEL-IA, Cessna Cardinal N30946, Based @ MD24
Amateur Radio Station AB3A
"Beware of the massive impossible!"


From [e-mail] Sun Aug 11 05:50:59 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.neca.com!chi-news.cic.net!newsfeed.internetmci.com!in3.uu.net!nntp.teleport.com!ip-pdx09-01
From: [e-mail] (Roy Lewallen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Direct Conv. Receiver Questions
Date: Wed, 07 Aug 96 16:06:16 GMT
Organization: EZNEC Antenna Software
Lines: 23
Message-ID: <4uaerl$[e-mail]>
References: <4u7ph5$[e-mail]>
NNTP-Posting-Host: ip-pdx09-01.teleport.com
X-Newsreader: News Xpress Version 1.0 Beta #3

In article <4u7ph5$[e-mail]>,
   [e-mail] (Kjhales) wrote:
>A digital guy wants to build an analog DC receiver and has the following
>questions:
>
>1) Audio amplifiers
>   The best op-amps I have run across have about 0.5uV input noise
>   in a 3KHz band when driven from 100 ohms. Can I reasonably expect
>   to do better with a discrete design? Or are other limits in the system
>   going make improvement useless?

If your DC rx is for HF and you'll be using reasonably efficient antennas,
atmospheric noise will typically limit the system if you use one of the
lower-noise op amps. Any further improvement in receiver noise figure
over this won't improve system performance.

> . . .

I haven't made a phasing system - yet - so can't answer the remaining
questions. I suggest reading the QST articles on this topic by Rick
Campbell beginning three or so years ago.

Roy Lewallen, W7EL


From [e-mail] Sun Aug 11 05:51:00 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!tezcat.com!netaxs.com!hunter.premier.net!news.cais.net!wvnvms!cerc.wvu.edu!crowe
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Direct Conv. Receiver Questions
Message-ID: <[e-mail]>
From: [e-mail] (Randy Crowe)
Date: Thu, 8 Aug 1996 17:51:42 GMT
Sender: [e-mail]
References: <4u7ph5$[e-mail]> <4u8m4p$[e-mail]>
Organization: West Virginia University
Nntp-Posting-Host: crowe.geo.wvu.edu
X-Newsreader: News Xpress 2.0 Beta #2
Lines: 25

In article <4u8m4p$[e-mail]>, [e-mail] (John Kolb) wrote:
>Kjhales ([e-mail]) wrote:
>: A digital guy wants to build an analog DC receiver and has the following
>: questions:
>
>: 3) LO phase shifter
>:    Suppose I have a LC oscillator. Can I tap 2 points on the inductor
>:    and get signals 90 deg. apart? Assuming tuning is done with the
>:    capacitor (L is fixed), will the phase shift be constant over freq?
>
>To get a 90 deg phase shift over a wide freq range, the easiest way
>is to have the LO at 4 times the desired freq. The LO output goes
>to a flip/flop and divides the freq by 2. The two F/F outputs, Q and Q/
>each got to another F/F. the Q outputs of the last two F/F's will be 90
>degrees apart.
>
>
You can also look at a LM567 tone decoder / phase lock loop. Look in the data
books.  There is a sample circuit that lists "Oscillator with Quadrature
Output" Where there is a 90 degree phase shift.  Being a PLL the freq. should
be pretty stable.  Good to ~ 50 Mhz.

Randy   N8OZY

[e-mail]


From [e-mail] Sun Aug 11 05:51:01 1996
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From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Direct Conv. Receiver Questions
Date: 9 Aug 1996 00:33:42 GMT
Organization: Hewlett Packard Corvallis Site
Lines: 21
Message-ID: <4ue116$[e-mail]>
References: <4u7ph5$[e-mail]>
NNTP-Posting-Host: hplsnb.lsid.hp.com
X-Newsreader: TIN [version 1.1 PL9.4]

Kjhales ([e-mail]) wrote:

: 1) Audio amplifiers
:    The best op-amps I have run across have about 0.5uV input noise
:    in a 3KHz band when driven from 100 ohms. Can I reasonably expect
:    to do better with a discrete design? Or are other limits in the system
:    going make improvement useless?


Discrete parts can do much better than this, but then so can op amps.
There are several op amps with voltage noise levels around 1nV/rtHz or
below.  The Analog Devices AD797 is one example, and it also is very
low distortion.  At that noise level, the RMS noise output will be
dominated by the noise in the 100 ohm resistor, a bit more than 1nV/rtHz
at room temperature, and construction technique will become important.
Use low noise power supplies, a good layout, and appropriate shielding.

--
Cheers,
Tom
[e-mail]


From [e-mail] Sun Aug 11 05:51:02 1996
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna,rec.radio.amateur.equipment
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-dc-10.sprintlink.net!nntp04.primenet.com!news.shkoo.com!nntp.primenet.com!news.cais.net!hunter.premier.net!newsfeed.internetmci.com!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Distance
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]> <[e-mail]>
Date: Sat, 3 Aug 1996 09:41:45 GMT
Lines: 61
Xref: news2.epix.net rec.radio.amateur.homebrew:16343 rec.radio.amateur.antenna:23528 rec.radio.amateur.equipment:31558

In article <[e-mail]> "Bill C." <[e-mail]> writes:
>A Guy named Moe wrote:
>> I am wondering what is the main factor in deturmaning the distance that
>> a signal my be sent quickly and with clear reception?
>
>The *main* factor is the receiver.

Beyond line of sight, the main factor is *propagation*. Antennas can
be important, and the receiver certainly is (but Marconi used a glass
tube full of iron filings to span the Atlantic). The modulation used
makes a difference, and transmitter power is the catchall factor. The
frequency chosen is also an important factor since it influences
all the other factors. The whole thing has to work as a system.

Signalling speed (baud) for terrestrial beyond line of sight paths
is determined primarily by multipath. Operating near the MUF (for
ionospheric paths) will reduce multipath, and coherent M-ary modulation
with proper coding can resist it. At VHF+, antenna directionality
and siting are the largest factors in controlling multipath. Good
modulation choices (such as SS) can resist its degradations.

For free space paths, SNR (and available bandwidth) dominate as
the factors controlling signalling speed. Coherent modulations
again help in resisting degradation by low SNR (incoherent OOK
is a poor choice, incoherent analog modulations a worse one).
A stronger transmitted signal directly affects channel SNR. A
good receiver can avoid excessively degrading channel SNR (both
through using low noise devices to avoid contributing to channel
noise and by using matched filtering to avoid passing out of channel
noise), but it can't improve channel SNR. A directional antenna can
effectively improve channel SNR over isotropic by restricting the
noise coming from other directions on channel from reaching the
receiver.

Assuming adequate techniques are used for each link in the chain,
for a given frequency, the order of importance probably goes like
this;

1) Propagation
2) Antennas
3) Modulation
4) Receiver
5) Transmitter

Propagation dominates, and is the largest loss factor and the
largest factor contributing to multipath. Antennas couple to the
propagation path and thus are key elements. The modulation chosen
determines how well the signal can resist the various impairments
caused by propagation. The receiver must avoid degrading channel
SNR as much as possible. And finally, enough transmitter power
must be used to overcome all the loss mechanisms. The amount of
transmitter power *necessary* is often surprisingly small, however.
With the correct choices of other factors, a few milliwatts can
easily span the globe.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | Due to provider problems
Destructive Testing Systems |    we break it.     | with previous uucp address
es
534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Sun Aug 11 05:51:04 1996
Message-ID: <[e-mail]>
Date: Thu, 08 Aug 1996 20:57:18 -0400
From: "James F. Boehner, MD" <[e-mail]>
Reply-To: [e-mail]
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To: Bill Sohl <[e-mail]>
Subject: Re: FCC Ruling Prohibits Unreasonable Restrictions on TV Antennas
References: <4u8u23$[e-mail]> <4ubedc$[e-mail]>
Content-Type: text/plain; charset=us-ascii
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Bill Sohl wrote:
>
> [e-mail] (Ed Mitchell) wrote:
>
> >***** Breaking News Story *****
> >FCC Ruling Prohibits Unreasonable Restrictions on TV Antennas
> >by Ham Radio Online, 7 August 1996
>
> >In a major ruling, the FCC declared void local laws prohibiting
> >or restricting the use of small wireless dish antennas.
> >More significantly, the FCC declared that use of small dish
> >antennas and television receiving antennas can not be restricted
> >by "any private covenant, homeowners' association rule or similar
> >restriction on property within the exclusive use or control of
> >the antenna user". Under the federal pre-emption, all homeowners
> >must be allowed to install TV antennas. Longer term this ruling may
> >have important ramifications for eliminating restrictions on Amateur
> >Radio antennas.
>
> >The complete story is available at Ham Radio Online at:
> >http://206.13.40.11/
>
> Wow, do I have a couple of ideas for some QST articles
> that begin  with a title:  How to build a (enter your
> favorite band here) meter antenna that looks like a TV
> antenna :-)
>
> Bill Sohl  K2UNK
> ARRL Local Gov't Liaison, Mt. Olive Township, NJ

How about a sky of aluminum with a $40 Radio Shack Antenna on top?
YES!!!!!

73 de JIM N2ZZ


From [e-mail] Sun Aug 11 05:51:06 1996
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From: [e-mail] (erikc)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.shortwave
Subject: Re: FCC Ruling Will Require Some Hams to File Environmental Impact Reports
Date: Wed, 07 Aug 1996 03:46:34 GMT
Organization: bugshit.nutso.com
Lines: 29
Message-ID: <4u93ab$[e-mail]>
References: <4u2uvk$[e-mail]> <4u7flm$[e-mail]> <4u7qbl$[e-mail]>
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[e-mail] wrote:

>>|[e-mail] (Gary Fiber) wrote:

>>|It won't be long before our stools must be tested to comply with EPA
>>|emissions standards.  Why don't they just skip right to the end
>>|result, and declare everything to cause cancer. Then we can sue
>>|everyone for being a contibutor to our demise. Problem with that is,
>>|there would probably be an environmental fee attached to whatever you
>>|are awarded, so the government and enviro-weirdos can sleep easier at
>>|night knowing you can't spend it on waste-producing polutants.

>>|New Surgeon Generals warning label:

>>|"The Surgeon General has determined that prolonged brain usage may
>>|cause cancer, premature aging and death. Try not to think, live
>>|longer."

>>|Rob Neff (N7ORY)

More to the point, the leading cause of death in this country is being
born.  ;-)  Get used to it.

Erikc


Religious fundamentalists are a plague sent by God to
punish us for our joys. -- me



From [e-mail] Sun Aug 11 05:51:07 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!news.sgi.com!swrinde!cs.utexas.edu!howland.erols.net!vixen.cso.uiuc.edu!newsfeed.internetmci.com!hunter.premier.net!news.cais.net!news.sfo.com!news.zeitgeist.net!news.c2.org!re.hotwired.com!news.sprintlink.net!news-ana-7.sprintlink.net!jupiter.planet.net!usenet
From: [e-mail] (Bill Sohl)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.shortwave
Subject: Re: FCC Ruling Will Require Some Hams to File Environmental Impact Reports
Date: Wed, 07 Aug 1996 02:52:42 GMT
Organization: Mount Olive Township (NJ) Emergency Management
Lines: 13
Message-ID: <4u90ad$[e-mail]>
References: <4u2uvk$[e-mail]> <[e-mail]>
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OK, so where can we find a copy of these rules
on the internet?

>In article  [e-mail] (Ed Mitchell) writes:
>:>The FCC has issued new rules regarding the evaluation of RF Emissions and
>:>health effects from all transmitters. As always, the devil is in the detail
s
>:>and the details say that if you transmit over 50 watts, you may have
>:>to perform an RF emissions environmental assessment of your Amateur station
.


Bill Sohl  K2UNK
ARRL Local Gov't Liaison, Mt. Olive Township, NJ



From [e-mail] Sun Aug 11 05:51:10 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!news.sgi.com!swrinde!cs.utexas.edu!howland.erols.net!vixen.cso.uiuc.edu!newsfeed.internetmci.com!hunter.premier.net!news.cais.net!news.sfo.com!news.zeitgeist.net!news.c2.org!re.hotwired.com!news.sprintlink.net!news-ana-7.sprintlink.net!jupiter.planet.net!usenet
From: [e-mail] (Bill Sohl)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.shortwave
Subject: Re: FCC Ruling Will Require Some Hams to File Environmental Impact Reports
Date: Wed, 07 Aug 1996 02:59:33 GMT
Organization: Mount Olive Township (NJ) Emergency Management
Lines: 23
Message-ID: <4u90nd$[e-mail]>
References: <4u2uvk$[e-mail]> <4u7flm$[e-mail]>
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[e-mail] (Gary Fiber) wrote:

>[e-mail] (Ed Mitchell) wrote:
>>The FCC has issued new rules regarding the evaluation of RF Emissions and
>>health effects from all transmitters.
>>You can read the complete text of the relevent FCC ruling in FCC 96-396 at
>>Ham Radio Online magazine, available on the Internet at:
>>   http://206.13.40.11/
>>(we had to move to a new server and are waiting for InterNIC to move our
>>www.hamradio-online.com domain name to the new server)

>This could get real interesting.  .......
>  Also I wonder what the FCC intends to do with all the land mobile equipment
>as most all is 100 watts.  The article implies a mobile station operating ove
r
>50 watts could also not be in compliance with the guidelines..
>Gary

Yep, all the police cars in my town run 100 watts at 39 MHz.
Should be interesting as said...

Bill Sohl  K2UNK
ARRL Local Gov't Liaison, Mt. Olive Township, NJ



From [e-mail] Sun Aug 11 05:51:11 1996
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From: [e-mail] (Dan Finn)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.shortwave
Subject: Re: FCC Ruling Will Require Some Hams to File Environmental Impact Reports
Date: Thu, 08 Aug 1996 22:53:57 GMT
Lines: 35
Message-ID: <4udrd1$[e-mail]>
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[e-mail] (Gary Coffman) wrote:


>However, Part 90 *portable* radio stations are categorically exempted.
>I'm not sure the FCC considers "mobile" rigs to be "portable" radio
>stations. If not, *each* installation must be certified. Otherwise,
>they're exempt *regardless* of power level. Cops always seem to be
>"more equal" under the law than you or me.

Does anyone know off hand if they are using the IEEE C92.1 limits? If
so, Anybody trying to transmit at the normal 100W in a residential
neighborhood (ie, low wire dipole antenna) may be in trouble. Forget
about using attic antennas. The standard penalizes efficient antennas.
I also believe the limits vary wiith frequency; I know that that the
allowable ERP at 800MHz is only about 0.4W, compared to the previous
7W Max. transmitter power (the old standard did not consider antenna
efficiency). I also know that 800MHz products designed well below the
7W transmitter power level usually did not meet the 0.4W ERP or that
other parameter, SAR (for products held close to the ear). Yes, our
handheld devices may be exempted but my point is that, if FCC is using
the 1992 IEEE standard, amateurs in residential areas (a large portion
of the ham population) will at the very least be marginal at 100W, if
they use wire dipoles, G5RV's, slopers etc.,  and I believe the small
600W linears will be out of the question. I hate to sound like I'm
sounding a false alarm but I'm not ready yet to buy into ARRL's
contention ( D. Sumner) that the new regulation will show how safe
amateur installations really are. I'm sure he has a high tower to take
advantage of 1/R**2. The new IEEE limits are much lower than the
previous standard, but we will not start seeing this until after we
start making the measurements.

73

KR4AJ



From [e-mail] Sun Aug 11 05:51:12 1996
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From: [e-mail] (Paul E. Campbell)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.shortwave
Subject: Re: FCC Ruling Will Require Some Hams to File Environmental Impact Reports
Followup-To: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.shortwave
Date: 7 Aug 1996 15:13:53 -0400
Organization: Michigan Technological University
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[e-mail] wrote:
: [e-mail] (Gary Fiber) wrote:
:
: It won't be long before our stools must be tested to comply with EPA
: emissions standards.  Why don't they just skip right to the end
: result, and declare everything to cause cancer. Then we can sue
: everyone for being a contibutor to our demise. Problem with that is,
: there would probably be an environmental fee attached to whatever you
: are awarded, so the government and enviro-weirdos can sleep easier at
: night knowing you can't spend it on waste-producing polutants.

Uhh..you do realize that rainwater does not meet EPA regulations for discharge
into public bodies of water? EPA rules say pH MUST be 6-8. The fact that
absorbed carbon dioxide makes it pH 5.5 makes rainwater a violation of EPA
regulations.

Also spring floods due to particulates. To say nothing of natural background
radiation, mercury, lead, etc., in areas that have that stuff.


From [e-mail] Sun Aug 11 05:51:14 1996
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From: [e-mail] (Andy Domonkos)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.shortwave
Subject: Re: FCC Ruling Will Require Some Hams to File Environmental Impact Reports
Followup-To: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.shortwave
Date: 9 Aug 1996 11:52:22 GMT
Organization: Express Access Online Communications, Greenbelt, MD USA
Lines: 23
Message-ID: <4uf8pm$[e-mail]>
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Peter A. Klein ([e-mail]) wrote:
:
: I'm sure the ARRL, not to mention many commercial organizations, would
: raise quite a squawk if every user of a 50+ watt transmitter in the U.S.
: had to file Love Canal-style paperwork.  This would involve every police
: and fire department in the country, for starters.
:
: 73,
: Peter - KD7MW

Exactly! What about hospitals (where one goes to get healed supposedly)
and their 5 kilowatt ERP pager antennas? I'm serious, I've seen the specs
required by some hospitals here in Md for their paging network. Not to
mention commercial pagers.

Like the new bogus stricter vehicle emmissions laws, if you don't meet EPA
requirement you have to pay waiver penalty (in Maryland, $150 for 2
years).

Sounds like another money-grubbing scam from Washington.

Andy N3LCW



From [e-mail] Sun Aug 11 05:51:15 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-stk-200.sprintlink.net!news.inc.net!newspump.sol.net!spool.mu.edu!howland.erols.net!usc!elroy.jpl.nasa.gov!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (David Shalita)
Newsgroups: rec.radio.amateur.homebrew
Subject: FFT with Soundblaster Clone cards
Date: 11 Aug 96 02:33:42 GMT
Organization: LAFN
Lines: 31
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

Hi,

Sound Blaster cards are used in many different Ham Radio  applications.
My question concerns if clones of Sound Blaster 16 bit cards can be used
or must  real Sound Blaster cards be used for these Ham Applications?

Is there something unique about the real 16 bit Sound Blaster cards that
would prevent software like you are discussing from working with clone
cards of the  16bit Sound Blaster?

In a system I am buying they propose to install a  sound card, called an
"OPTI" card rather than a true 16 bit Sound Blaster  card. I am not sure
if this is a clone of the SB 16, but they say the OPTI is superior to the
real SB 16 card.

Thanks for any thoughts.



>> Need an FFT analyzer program that runs on a PC/soundcard that will not aver
age

>> and entire waveform, but allow the observance of the spectra of a part of t
he w
>
> aveform. Does anybody know if such software exists as shareware or commercia
lly
>

Regards, W6MIK
--
                _____________________________________
                 Dave Shalita, [e-mail]



From [e-mail] Sun Aug 11 05:51:16 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-stk-3.sprintlink.net!news.sprintlink.net!news-stk-11.sprintlink.net!newsfeed.internetmci.com!news.io.com!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: FS Parts, Parts. (updated) [hombrw.txt] (1/1)
Date: 8 Aug 1996 23:58:35 GMT
Lines: 46
Message-ID: <4uduvb$[e-mail]>
NNTP-Posting-Host: dialup-01-051.austin.io.com
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

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K:6YG+@T*04Q,(%!224-%4R!!4D4@1DE232`A(2`@("!.3R!44D%$15,@(7
`
end


From [e-mail] Sun Aug 11 05:51:17 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!nntp04.primenet.com!news.shkoo.com!nntp.primenet.com!winternet.com!mr.net!news.sgi.com!swrinde!cs.utexas.edu!howland.erols.net!news1.erols.com!hunter.premier.net!netnews.worldnet.att.net!ix.netcom.com!news
From: [e-mail](Robert M. Miller)
Newsgroups: rec.radio.amateur.homebrew
Subject: Got a W2JAV article: Tks
Date: 9 Aug 1996 02:20:08 GMT
Organization: Netcom
Lines: 6
Message-ID: <4ue78o$[e-mail]>
NNTP-Posting-Host: sac-ca16-15.ix.netcom.com
X-NETCOM-Date: Thu Aug 08  7:20:08 PM PDT 1996

Thanks to the folks who responded to my query for a W2JAV RTTY TU
print.  I'm off the garage to try it one more time

    73,

    Bob, KE6F


From [e-mail] Sun Aug 11 05:51:20 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sgi.com!news.msfc.nasa.gov!newsfeed.internetmci.com!news.bctel.net!news.mag-net.com!ve7tcp.ampr.org!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Pat Barthelow)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ham-Homebrew Digest V96 #334
Date: 9 Aug 96 06:06:00 GMT
Organization: ucsd usenet gateway
Lines: 24
Message-ID: <[e-mail]>
References: <199608082144.OAA21547@.mail.ucsd.edu>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

Re:

4-1000 Schematics:  You can contact the Eimac Distributor in your country
and ask for a Amateur Application notes index.  Within that index, there are
several App Notes that pertain to the 4-1000A tube.  Complete schematics
and details on how to build that amp, and also dozens of other, related
hands on topics on amp building, in general.  My recollection of the
4-1000A in Grounded grid, is that it will put out GOBS of power, uses
quite high Plate voltages, and requires lots of drive, maybe 150 watts
drive at HF.  I run a pair of 4-400A's on CW which put out about 800 to
1000 watts (output) when driven with 100 watt exciter.  This is with
about 2700 volts on the plate, under load, and 550 ma plate current.  I
would like to add a third tube, sometime, as they are cheap, sometimes free
if you know a friendly Radio Engineer, who is a ham.  Three 4-400As
should easily loaf along at a full 1500 watts output.  Make sure you also get
the App Notes that apply to cooling requirements to these tubes.  The
4-1000A tube has a ceramic surround at the base, with metal ring that
adds a fair amount of backpressure when combined with the glass chimney.
Use a squirrel cage fan (NOT A "MUFFIN" FAN) for cooling.
In the U.S. Eimac has 2 toll free numbers that info can be obtained from:
San Carlos (CA) office: [phone], Utah: [phone].
BTW, I have no connection, or commercial interests in Eimac.
73, and QRO to you.... Best DX, de Pat, AA6EG, [e-mail]



From [e-mail] Sun Aug 11 05:51:21 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sgi.com!news.msfc.nasa.gov!newsfeed.internetmci.com!news.bctel.net!news.mag-net.com!ve7tcp.ampr.org!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Pat Barthelow)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ham-Homebrew Digest V96 #334
Date: 9 Aug 96 06:12:47 GMT
Organization: ucsd usenet gateway
Lines: 10
Message-ID: <[e-mail]>
References: <199608082144.OAA21547@.mail.ucsd.edu>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

Re: 4CX-250 B and 4CX-250F tubes;

From the Eimac Data Book, it appears that the only difference between
the tubes is the Oxide Coated cathode heater voltages.

4CX 250B/7203 : 6.0 Volts, 2.6 amperes
4CX 250FG/8621:  26.5 Volts, 0.54 Amperes

73, QRO, DX, de Pat, AA6EG, [e-mail]



From [e-mail] Sun Aug 11 05:51:22 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.clark.net!mr.net!news2.cais.net!news.cais.net!netnews.com!news.dx.net!news
From: [e-mail] (Doug)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: how can I broadcast on FM radio?
Date: Tue, 06 Aug 1996 13:17:39 GMT
Organization: Doug's Personal Defense Products
Lines: 36
Message-ID: <4u7gpr$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: s13.lrbcg.com
X-Newsreader: Forte Free Agent 1.0.82
Xref: news2.epix.net rec.radio.amateur.equipment:31526 rec.radio.amateur.homebrew:16328

robert <[e-mail]> wrote:

>Could someone point towards info on how to broadcast on FM radio.
>I've heard it called free radio or pirate radio. Does that mean it's
>illegal (how illegal:)? What makes it illegal (in florida)? Where can I
>buy the equipment? What would I need to buy? I just want to transmit 5
>to 10 miles and just music (mostly my own and my friends music so as not
>to violate copyrights or whatever).

>--
>______________________
>robert mailto:[e-mail]

Robert send a $1 to:

Pan-Com International
P O Box 130
Paradise CA 95967-0130

[phone]

They have a lot of equipment & kits for FM low power
broadcast stations.

Doug






__________________________________________________
Protect Yourself & Your Family - No One Else Will!
Doug's Personal Defense Products
http://lrbcg.com/dougd



From [e-mail] Sun Aug 11 05:51:23 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-fw-22.sprintlink.net!news.sprintlink.net!news-ana-7.sprintlink.net!news.sprintlink.net!news-ana-24.sprintlink.net!news.sprintlink.net!news-stk-3.sprintlink.net!nntp04.primenet.com!news.shkoo.com!nntp.primenet.com!news.cais.net!newshub.sdsu.edu!newsfeeder.sdsu.edu!news.sgi.com!swrinde!cs.utexas.edu!howland.erols.net!vixen.cso.uiuc.edu!newsfeed.internetmci.com!news.dbtech.net!usenet
From: "Brian S. McDaniel" <[e-mail]>
Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.antenna,rec.radio.amateur.misc
Subject: Re: how can I broadcast on FM radio?
Date: Thu, 08 Aug 1996 11:51:59 -0500
Organization: WVTM-TV
Lines: 8
Message-ID: <[e-mail]>
References: <[e-mail]> <4u8h1e$[e-mail]> <4uaoqn$[e-mail]>
NNTP-Posting-Host: ppp64.dbtech.net
Mime-Version: 1.0
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Michael Colvin wrote:
>
> Become a DJ?

Work on your communications skills, first.

73 DE KC4LMD
WVTM-TV


From [e-mail] Sun Aug 11 05:51:25 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-chi-8.sprintlink.net!newsfeed.internetmci.com!in3.uu.net!nntp04.primenet.com!news.shkoo.com!nntp.primenet.com!winternet.com!mr.net!news.mr.net!cronkite.polaristel.net!news
From: "Chris Davis" <[e-mail]>
Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.antenna,rec.radio.amateur.misc
Subject: Re: how can I broadcast on FM radio?
Date: 9 Aug 1996 05:06:31 GMT
Organization: FISH Computing
Lines: 24
Message-ID: <01bb85b0$252d88a0$195c09ce@chris>
References: <[e-mail]>
NNTP-Posting-Host: 206.9.92.25
X-Newsreader: Microsoft Internet News 4.70.1132
Xref: news2.epix.net rec.radio.amateur.policy:35836 rec.radio.amateur.equipment:31590 rec.radio.amateur.homebrew:16370 rec.radio.amateur.antenna:23545 rec.radio.amateur.misc:105832

Robert,

It may sound fun (when I was in college, we tried to do the same thing, but
were unsuccessful, luckily.)  If you do succeed, you WILL most likely be
caught, unless you are in an area with almost no radio stations.  As an
assistant engineer at an FM station with several translators, we regularly
monitor the band with a spectrum analyzer and would most likely find a
'pirate' station within a few days of it's debut.  I'm sure you've read the
posts from others outlining the fines.

Radio is an appealing hobby.  I'm sure your intent is not to break the law.
 Why not go about it through the existing channels?  If your desire is to
communicate, try amateur radio, it's lots of fun!  If your goal is to get
your music 'on the air', seek out a local college or technical school radio
station.  I'm involved in both amateur radio and broadcast radio, a
rewarding hobby and career.  Good luck!

--
<><--------------------------------------------------------------<><
                 Chris Davis KB0WWP
                     [e-mail]
       Asst. Engineer KJLY - Christian Radio
                       Blue Earth, MN
<><--------------------------------------------------------------<><


From [e-mail] Sun Aug 11 05:51:26 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sgi.com!spool.mu.edu!munnari.OZ.AU!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: Inductance meter schematic
Date: Fri, 9 Aug 1996 15:54:50
Organization: TRL
Lines: 14
Message-ID: <[e-mail]>
References: <4ua61i$[e-mail]>
NNTP-Posting-Host: pcies4.trl.oz.au
Keywords: inductance meter
X-Newsreader: Trumpet for Windows [Version 1.0 Rev Final Beta #7]

In article <4ua61i$[e-mail]> [e-mail] writes:
>From: [e-mail]>Subject: Inductance meter schematic
>Date: Wed, 07 Aug 1996 13:35:10 GMT> Do anyone out there have a shematic for
an easy build and good>working inductance meter !?

If you only need to measure in the microhenry range, see;

"The Handy Inductance Bridge" by KB4ZGC, in 73 Amateur Radio, May '91.

Drew, VK3XU.






From [e-mail] Sun Aug 11 05:51:27 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!imci3!newsfeed.internetmci.com!in3.uu.net!EU.net!usenet2.news.uk.psi.net!uknet!usenet1.news.uk.psi.net!uknet!psinntp!psinntp!psinntp!main03!landisj
From: [e-mail] (Joe Landis - Systems & Network Mgr)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Info on old GenRad oscillators
Message-ID: <1996Aug8.204935.606@main03>
Date: 8 Aug 96 20:49:35 EST
Distribution: world
Organization: North American Drager - Telford, PA
Lines: 13
Xref: news2.epix.net rec.radio.amateur.equipment:31581 rec.radio.amateur.homebrew:16359

General Radio 1362 UHF Oscillator, 220-920mhz and
General Radio 1208B VHF Oscillator, 65-500mhz

I found these neat UHF and VHF oscillators at a hamfest for $5. Only problem
is that they have a pigtail cable apparantly plug into a mating power supply,
which I do not have. Does anyone know the pinouts or have a schematic? Perhaps
even the supply? :)

Thanks and 73!
Joe - AA3GN
--
[e-mail] - speaking only for myself, of cou


From [e-mail] Sun Aug 11 05:51:27 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsfeed.telalink.net!telalink!news.wildstar.net!news.sdsmt.edu!news.mid.net!mr.net!winternet.com!n1ott.istar!ott.istar!istar.net!tor.istar!east.istar!newsjunkie.ans.net!newsfeeds.ans.net!howland.reston.ans.net!newsfeed.internetmci.com!in3.uu.net!news.thepoint.net!news1!ind-007-237-45
From: [e-mail] (Tom Crismore)
Subject: Interface help
X-Nntp-Posting-Host: ind-007-237-45.iquest.net
Message-ID: <4u7j2s$[e-mail]>
Sender: [e-mail] (News Admin)
Organization: IQuest Network Services
X-Newsreader: News Xpress Version 1.0 Beta #4
Date: Tue, 6 Aug 1996 13:58:52 GMT
Lines: 6

I have a Ten-Tec Paragon with a RS232 interface.  So far I have been unable to

find software to control the rig.  With a term program I can control functions
with ASCII charters and get feedback when requested.  I want to control the
rig form Windows 95.  I was wondering if anyone had some ideas to help me do t
his.
What I would like to do is make my own .BMP pictures that when I click on a
portion of it this would send the commands to the rig.



From [e-mail] Sun Aug 11 05:51:28 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.mathworks.com!newsfeed.internetmci.com!in2.uu.net!telepath!usenet
From: [e-mail] (brian whatcott)
Newsgroups: sci.electronics.design,rec.radio.amateur.homebrew
Subject: Re: ISO design ideas for 1 Watt 14 MHz sine generator
Date: 7 Aug 1996 22:50:50 GMT
Organization: Telepath
Lines: 16
Message-ID: <4ub6ka$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: 205.228.199.41
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.7
Xref: news2.epix.net sci.electronics.design:10530 rec.radio.amateur.homebrew:16337

In article <[e-mail]>, [e-mail] says
...
>
>I'm seeking design ideas for a 1 Watt 14 MHz sine generator
>with the following specs :
>- 1 Watt output into 50 Ohm load (20 V peak-peak)
>- any harmonics  50 dB  below 14 MHz fundamental
>- 100 ppm frequency tolerance => start from a crystal
>- no (or few) adjustment
>- reasonable efficiency (60% ?) from 24V DC power supply
>Francois Grieu - [e-mail]

A packaged xtal osc into a linear power FET seems like the
 simple way to go.

brian



From [e-mail] Sun Aug 11 05:51:29 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.inc.net!newspump.sol.net!spool.mu.edu!howland.erols.net!agate!blanket.mitre.org!news.tufts.edu!cam-news-feed5.bbnplanet.com!terra.net!server1.chelmsford.com!usenet
From: alan anganes <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Microwave ideas please?
Date: 9 Aug 1996 23:18:34 GMT
Organization: Chelmsford On-Line Services
Lines: 19
Message-ID: <4ugh0a$[e-mail]>
NNTP-Posting-Host: 199.103.186.113
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; U; 16bit)

Are there any microwave experts out here? This is not quite a ham radio
question, but I figured that there must be someone here who can help me.

 I need some ideas for a method to couple microwave energy, from say a MW
oven magnetron, to a small liquid sample (a few cc's) which is mostly
water. I wish to cause rapid heating of samples in a very short amount of
time, with short microwave pulses.

 I learned lots of this stuff in collage, but am really so far from it
now, that I need one of you guys to point me in the right direction.

 I apologize for the off topic post, and will gladly move off to email,
so as not to drive everyone nuts. Thanks for your help.


[e-mail]

Al Anganes WB1BQC



From [e-mail] Sun Aug 11 05:51:30 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-stk-11.sprintlink.net!tank.news.pipex.net!pipex!news.be.innet.net!INbe.net!news.nl.innet.net!INnl.net!hunter.premier.net!news-res.gsl.net!news.gsl.net!news.sgi.com!enews.sgi.com!EU.net!usenet2.news.uk.psi.net!uknet!usenet1.news.uk.psi.net!uknet!uknet!strath-cs!dcl-cs!bath.ac.uk!morse.ukonline.co.uk!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: motorola ht600e help
Date: 6 Aug 1996 21:04:06 GMT
Organization: UK Online
Lines: 2
Message-ID: <4u8c06$[e-mail]>
NNTP-Posting-Host: wwwproxy.ukonline.co.uk

looking for a copy of programming software for the  ht600e hndheld and info.
Can anyone help thankyou.


From [e-mail] Sun Aug 11 05:51:31 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-stk-3.sprintlink.net!news.megalink.net!imci4!newsfeed.internetmci.com!uwm.edu!lll-winken.llnl.gov!enews.sgi.com!news.sgi.com!nntp-hub2.barrnet.net!cpk-news-feed2.bbnplanet.com!news.ner.bbnplanet.net!usenet.teradyne.com!dawn.icd.teradyne.com!maddix
From: [e-mail] (Nick Maddix )
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc
Subject: Re: N6GN Microwave Data Link
Date: 7 Aug 1996 18:13:13 GMT
Organization: Teradyne, Inc. Boston MA
Lines: 14
Message-ID: <4uambp$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: dawn.icd.teradyne.com
X-Newsreader: Tin 1.1 PL5
Xref: news2.epix.net rec.radio.amateur.homebrew:16350 rec.radio.amateur.digital.misc:16655

The handbook article is also incorrect in many ways. N6GN's web page
for the project has some of the corrections needed.
http://www.tapr.org/~n6gn/uwavelink/uwv.html

I have also noticed a few that are not on the page. As soon as I get them
together I post them so the page can be changed. The ones I remeber are that
the base of the LO JFET is not grounded on the board, and the LM386 amp is
connected correctly on the board but not the schematic. I know there is one
or two other missing connections, but I don't know them off the top of my
head (oddly enough :)

73,
Nick Maddix N1IHA



From [e-mail] Sun Aug 11 05:51:32 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.edu.tw!nctuccca.edu.tw!spring.edu.tw!serv.hinet.net!news.uoregon.edu!vixen.cso.uiuc.edu!newsfeed.internetmci.com!in3.uu.net!news.u-net.com!news
From: "N.Hampshire" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: NEW PRACTICAL ELECTRONICS WEBZINE
Date: 6 Aug 1996 21:05:51 GMT
Organization: U-NET limited
Lines: 7
Message-ID: <4u8c3f$[e-mail]>
NNTP-Posting-Host: emags.u-net.com

Electronics on the Web - is a new practical electronics webzine
for everyone with an interest in electronics. You can find us on:

http://www.emags.com/electron.htm

Nick Hampshire, Editor



From [e-mail] Sun Aug 11 05:51:33 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!ratty.wolfe.net!news.aa.net!ixa.net!news.ironhorse.com!news.uoregon.edu!hunter.premier.net!news.cais.net!netnews.com!news.dx.net!news
From: [e-mail] (Doug)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew
Subject: Non-conductive Rod Source
Date: Thu, 08 Aug 1996 04:06:21 GMT
Organization: Doug's Personal Defense Products
Lines: 19
Message-ID: <4ubp81$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: s22.lrbcg.com
X-Newsreader: Forte Free Agent 1.0.82
Xref: news2.epix.net rec.radio.amateur.antenna:23535 rec.radio.amateur.homebrew:16347

I've seen posts for plastic rods for booms, etc. Here is a
good source I found:

United States Plastic Corp.
1390 Neubrecht Road
Lima OH 45801

1-800-537-9724 - Voice
1-419-228-5034 - FAX

They offer plastic, acrylic, polycarbonate, PVC, CPVC,
polyethylene, polypropylene, UHMW?, teflon, delrin, nylon,
polystyrene, polyurethane, phenolic, Fibergrate DynaForm,
etc., all sizes. Enough to make any homebrewer's heart glad!
;-)

Doug
KC8CGX



From [e-mail] Sun Aug 11 05:51:34 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-stk-3.sprintlink.net!news.megalink.net!imci4!newsfeed.internetmci.com!uwm.edu!lll-winken.llnl.gov!enews.sgi.com!news.sgi.com!nntp-hub2.barrnet.net!cpk-news-feed2.bbnplanet.com!news.ner.bbnplanet.net!usenet.teradyne.com!dawn.icd.teradyne.com!maddix
From: [e-mail] (Nick Maddix )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PCB resources
Date: 7 Aug 1996 18:07:10 GMT
Organization: Teradyne, Inc. Boston MA
Lines: 8
Message-ID: <4uam0e$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: dawn.icd.teradyne.com
X-Newsreader: Tin 1.1 PL5

Try AP Circuits. They are fairly cheap, provide quick turn-around, and plated-
through holes. All data is sent electronically, too.

http://www.apcircuits.com/

73,
Nick Maddix N1IHA



From [e-mail] Sun Aug 11 05:51:35 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: PIN diode
Date: 10 Aug 1996 00:17:35 -0400
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In article <4ubor0$[e-mail]>, [e-mail] (Todd
Owen) writes:

>
>How many microseconds does it take for a PIN diode to switch?
>
>
>--73, Todd KE4UDN
>
>

Common PIN diodes have carrier lifetimes between 1 and 40 microseconds,
but these are by no means the technical limits.

As a general rule..the larger the junction, the slower the diode. Slow
diodes are necessary on low frequencies. Long carrier lifetimes prevent
the diode from acting like a conventional rectifier.

Use a diode with a carrier lifetime of five to ten times the period of the
operating frequency. That requires a 2.5 - 5 uS diode for 1.8 MHz.

73 Tom


From [e-mail] Sun Aug 11 05:51:36 1996
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From: [e-mail] (Nick Maddix )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Please Help with 10GHz Microwave Gunn Diode Assembly
Date: 7 Aug 1996 18:18:36 GMT
Organization: Teradyne, Inc. Boston MA
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SHF Micro is on the net:
http://www.shfmicro.com/

email: [e-mail]

They have pretty cheap gunnplexers (w/out varactors, though) and replacement
diodes.

For really cheap gunnplexers try
Gary Krancher WB1AUA 10GHz sources $25/pair 203-634-3006

Good luck and 73,
Nick Maddix N1IHA



From [e-mail] Sun Aug 11 05:51:36 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Dave Kirkby)
Subject: Protecting tubes with thyratrons
Sender: [e-mail] (Usenet News System)
Message-ID: <[e-mail]>
Date: Tue, 6 Aug 1996 13:51:51 GMT
Reply-To: [e-mail]
Organization: UCL Dept of Medical Physics
Lines: 24

Hi,
   has anyone any experience of protecting tubes agains flashovers, by using a

thyratron to cut the HT off rapidly in the event of a flashover ? I've seen su
ch
a scheme mentioned in some Burle (formally RCA) application notes and are
considering it. Suffice it to say, I think I can lay my hands on a thryatron
cheaply - the leftovers of an old PhD project here.

I dont suppose I would bother if the tube is cheap/plentiful, but if one has
an expensive tube that is pretty much irreplacable on cost grounds, this
might be worth considering.


---
Dave Kirkby G8WRB
Dept of Medical Physics,
University College London,
11-20 Capper St,
London WC1E 6JA
Tel: [phone]
Fax: [phone]







From [e-mail] Sun Aug 11 05:51:38 1996
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From: Randy Smith <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Roanoke Doppler DF
Date: Fri, 09 Aug 1996 00:57:12 -0500
Organization: Smith's Software
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Tom Bratton wrote:

Has anyone out there built the Roanoke Doppler DF unit described in
"Transmitter Hunting ..etc."   by J Moell and T Curlee ?   If so, can
they confirm that there are no errors in the schematic  diagram (Fig 9-5)
 , please. I am having trouble with what  should be the easy bit,  the
audio amp/ low pass filter. With the component values shown I am not
getting the signal levels quoted in the text.    DC voltages are close to
spec. The digital bit works fine, so far. Whilst I check my wiring
(again!) I would appreciate some  reassurance from any successful
constructors.
 Thanks.
 Tom


  Hello Tom,
  I have built that unit (etched my own pcb) and it seems to work okay on
the bench. I am NOT impressed with the performance in the real world
though... Introduce some noise on the signal and the filter doesn't seem
to work quite right. I know this doesn't answer your question, but it is
all I know about it from personal experence. I do know someone else who
built and currently uses his. It seems to work okay for him, although I
have not looked at it with any test equipment... for all I know it could
be doing the same thing mine is. Good luck!
  Randy Smith


From [e-mail] Sun Aug 11 05:51:38 1996
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From: [e-mail] (John T Chasteen)
Newsgroups: rec.radio.amateur.homebrew
Subject: TECH. REF. NEEDED FOR HEATHKIT DX40 TRANSMITTER
Date: 11 Aug 96 01:16:14 GMT
Organization: ucsd usenet gateway
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Hello all

I Just become the proud owner of a /heathkit DX40 Transmitter and need
all the technical info I can get. I dont have anything. Min. essential ..
a schamentic and parts list.

Any assistance will be appreciated.

Thank You,

John

St. John  of Wood Dale =======================================
John Chasteen     ( Near the center of the Universe...)
1 Thes 5:16          ( Near Chicago, Illinois.. USA )
voice 630-860-2580          [e-mail]
=========================================================





From [e-mail] Sun Aug 11 05:51:39 1996
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From: [e-mail] (Nils P. Pedersen)
Newsgroups: rec.radio.amateur.homebrew
Subject: VA3ARE
Date: Sat, 10 Aug 1996 11:37:26 GMT
Organization: Scantech Research
Lines: 14
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Does anybody know the email adress of  VA3ARE , Are Barstad? His last
known QTH was :  36 Beatty street, Parry sound,  Ontario Canada.
His wife is VE3TSZ.

They are good old friends of me, but we have lost contact. Telephone
number or current QTH would of course also be great.

Yes, I know this is not a missing persons group, but this article is
posted in differen amateur-radio groups for obvious reasons  :-)

Thank you for your cooperation and best 73  de LA7SL.

email me at  [e-mail].



From [e-mail] Fri Aug 16 15:36:07 1996
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From: [e-mail] (Steven L. Finberg)
Newsgroups: rec.radio.swap,rec.radio.amateur.misc,rec.radio.info,sci.electronics.misc,ne.forsale,ne.general,rec.radio.amateur.homebrew
Subject: ** FLEA at MIT **     Sunday 18 August       Cambridge MA
Followup-To: poster
Date: 12 Aug 1996 08:44:24 GMT
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Summary: Buy Sell SWAP Ham Radio  Electronics Computers 9AM - 2PM
Keywords: Hamfest Fleamarket SWAPFEST  Computers Ham Radio Electronics
Xref: news2.epix.net rec.radio.swap:71253 rec.radio.amateur.misc:105887 rec.radio.info:11632 sci.electronics.misc:8349 ne.forsale:66465 ne.general:38079 rec.radio.amateur.homebrew:16389

This comming Sunday...

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         so come rain or shine or super heat the Flea is on !!!

*********  $1  buyers discount with hardcopy of this notice ********

COMPUTERS - ELECTRONICS - HAM RADIO - COMPUTERS - ELECTRONICS - HAM RADIO

                  FLEA  all SUMMER at MIT
                     August 18th,  1996
                         9AM-2PM

Come to the city for a great flea - plenty of free parking.

        MIT's  electronics and ham radio flea will take
        place on the third Sunday of each month this summer,
        April thru October.

        There is tailgate space for over 600 sellers and
        free, off-street parking for >1000 cars!

        Buyers admission is $4  (you get $1 off if
        you're lucky enough to have a copy of our ad)
        and sellers spaces are $10.00-each at the gate.

        The flea will be held at the corner of Albany and
        Main streets in Cambridge; right in the Kendall
        Square area from 9AM to 2PM, with sellers set-up
        time starting at 7AM.

        !! RAIN or SHINE !!  Have no fear of rain, a covered
        well illuminated tailgate area is available for all
        sellers (6'8" clearance).

        Talk-in: 146.52 and W1XM/R-449.725/444.725 (PL 114.8/2A).

        Sponsors: MIT Electronics Research Society
                  MIT UHF Repeater Association (W1XM)
                  MIT Radio Society (W1MX)
                  Harvard Wireless Club (W1AF)

        For more info / advanced reservations 617 253 3776

********** $1  buyers discount with hard copy of this notice ************


******************************************************************************
*
Steve Finberg                       W1GSL                      [e-mail]
PO Box 82 MIT Br           Cambridge MA  02139-7082             617 258 3754
******************************************************************************
*





From [e-mail] Fri Aug 16 15:36:08 1996
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From: "Craig A. McCarter" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 3-Phase AC question
Date: Tue, 13 Aug 1996 14:15:56 -0400
Organization: Hoffman Engineering Corp.
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CCSys wrote:
>
> I have a Lambda switch-mode power supply with a 3-phase input
> requirement.  Being a switch-mode supply would this work acceptably
> using both sides (and the neutral) of the 220 line (and leaving one
> input disconnected?)
>
> From a brief examination the three inputs appear to be in the standard
> 4-diode "full-wave" rectifier configuration.  The outputs of the
> bridges appear to be connected together and to filter caps.  I assume
> that the ripple will be increased which may require greater
> capacitance.
>
> Any ideas or suggestions?
>
> Andrew
> N2CBU

Hi Andrew

I doubt you could get the rated power performance from the supply.  The
input would certainly suffer from a greater p-p ripple. It would be like
loosing power for 1/3 of the time going into the input capacitors,
relative to the design ripple parameters.  It might work satisfactorily
at a de-rated load though.

Craig
K1LFX


From [e-mail] Fri Aug 16 15:36:09 1996
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From: [e-mail] (William L. Fuqua III)
Newsgroups: rec.radio.amateur.homebrew
Subject: 4-1000A Amp Schematics Wanted
Date: 14 Aug 96 16:33:27 GMT
Organization: ucsd usenet gateway
Lines: 30
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

>IMD performance will not be nearly as good as most tubes designed with SSB
>in mind, but should be acceptable in most Amateur service if the amplifier
>is loaded heavily enough.

>73 Tom

   Here is some info from the 1972 Radio Handbook page 7.22 fig.22..

    TUBE                Eb      Ibo   Ib(max)   Po    3D ORDER IM DIST.
                        VOLTS   ma      ma     WATTS      db

 3-1000z/8164           2500    162     800    1250       -38
                        3000    175     670    1250       -35
                        3500    200     750    1770       -30

 4-1000A (GG)           3000     60     700    1475       -34
                        4000     90     675    1870       -34
                        5000     no IM distortion figure given

  INTERESTING INFO. THE 4-1000A IS NOT SO BAD IN GG CONFIGURATION.

73
BILL WA4LAV   was ko4ww

  William L. Fuqua III  P.E.  E-mail [e-mail]  Phone [phone]
5
  Department of Physics and Astronomy      CP-177 Chem. Phys. Bldg.
  University of Kentucky ,                 Lexington, Ky 40506-0055





From [e-mail] Fri Aug 16 15:36:10 1996
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From: Trent Howard <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: AM radio Noise
Date: Tue, 13 Aug 1996 15:48:04 -0700
Organization: Rockwell International
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I have a little radio in my office and evertime I use it with my
computer
monitor on I get a high pitched whine. is there anyway to filter this
out?
any ideas will be greatly apprecitated

you can mail me at [e-mail]
or reply in news

Thanks
Trent


From [e-mail] Fri Aug 16 15:36:11 1996
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From: Yvon Roy <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: AM radio Noise
Date: Thu, 15 Aug 1996 20:17:10 -0700
Organization: Sympatico
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Trent Howard wrote:
>
> I have a little radio in my office and evertime I use it with my
> computer
> monitor on I get a high pitched whine. is there anyway to filter this
> out?
> any ideas will be greatly apprecitated
>
> you can mail me at [e-mail]
> or reply in news
>
> Thanks
> Trent

You may try to locate your radio farther away from your computer. Also
try to turn the radio for maximum pick-up of the station and minimum
pick-up of the noise from the computer.If you are an electronics expe-
rimenter, I can suggest an idea, but you will have to open your radio
and do a little bit of extras. Yvon Roy


From [e-mail] Fri Aug 16 15:36:14 1996
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From: [e-mail] (Graham Seale)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Are vapors from solder harmfull?
Date: Sat, 10 Aug 1996 00:13:14 GMT
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> In article <4u83g4$[e-mail]>, [e-mail] says...
> >
> >I always find myself with my face right down near a circuit board trying to
> >solder or un-solder some microsized surface mount part or something. I
> >therefore breath a lot of solder/rosin smoke. Is this bad for your health?
> >Is there lead in the smoke?
>

Yes - there are some problems if you get it full into the lung. Alan's
advice is good, and if you use a small fan the danger from tox is low.
Handling lead will in time cause a cumulative buildup in you, again at a
low level. DON'T put it in your mouth!! - ever. The most common problem
is a strange tightness in the top of the chest, and a shortness of breath
that is very like asthma, but happens to everyone. It can also trigger
true asthmatics into fairly severe attacks. The symptom goes away after
a couple of hours in the fresh air.

Beware the toxic products if you are tinning coil wire. If you can smell it
strong enough to identify it as decomposing varnish, you are several times
over the top.

Hope this helps..

G4WNT

--
Graham


From [e-mail] Fri Aug 16 15:36:17 1996
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From: [e-mail] (Kerry Miller)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.swap
Subject: Re: Cheap CW Transceiver?
Date: Mon, 12 Aug 1996 02:35:59 GMT
Organization: Flash-Net Internet Service Provider, 888-FLASHNET
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Rick Miller <[e-mail]> wrote:

>
>Some ham catalogs came in the mail and struck price-shock into Bonnie,
>my wife.  If I can show her that a homebrew rig built out of cheap parts
>and/or salvaged junk is all I require, her relief would be immeasurable.

>Any help would be much appreciated...

>"Rigless" Rick Miller (kb9obn) [e-mail]

To "Rigless" from Kerry in Texas,

Man, I feel like I'm answering a personal ad or something!  My wife
has been pretty much dulled by the catalogs.  She got her ticket and
now she gets the catalogs!

More to the point, I just built a NorCal 40A, from Wilderness Radio.
I think the kit is $135 or so, do a web search for NorCal or
Wilderness Radio.  It is a qrp transceiver, about 2-3 watts, covers a
40-50 KHz segment of 40 meters, has a superhet rx and a great 400 Hz
4-pole xtal filter.

I've had mine for about 2 months now and am having a ball with it.  It
took me about 5 hrs to build, although some people take 15 hrs.  It
has excellent instructions, similar to Heathkit.  If you are handy
with a soldering iron, you won't have any problems.  Sorry, I read the
engineer part, but some of my EE friends don't know which end of the
iron to hold until it has been plugged in for a while!

73 es good luck with the project and the wife!
Kerry Miller, WD5ABC
[e-mail]





From [e-mail] Fri Aug 16 15:36:18 1996
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From: [e-mail] (Don Montgomery)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Commercial CW use
Date: 15 Aug 1996 20:41:16 GMT
Organization: Hewlett Packard Sonoma County
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Will Flor ([e-mail]) wrote:

> though the Coast Guard doesn't monitor for CW SOSs any more.

I found this hard to believe - that the one agency that should monitor
for CW distress signals doesn't.  I called the USCG monitoring station
in Point Reyes, CA., and confirmed that they do not.

I wonder if CW will be dead after this generation, like landline morse?

73 Don K6LTS
[e-mail]



From [e-mail] Fri Aug 16 15:36:19 1996
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From: Joe Sartori <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio,amateur.misc,rec.radio.amateur.homebrew
Subject: Re: Compact UHF Repeaters For Sale
Date: Sun, 11 Aug 1996 14:34:24 -0400
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How about Some specs....


Joe Sartori WB3IUT


From [e-mail] Fri Aug 16 15:36:20 1996
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From: "J. Miner" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Computer Interface for Icom IC-707
Date: Sun, 11 Aug 1996 18:19:29 -0700
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Hello,

I have the Icom IC-707 HF Rig.  It has an option of hooking it up to the
computer for changing freq., memories, and ect.  I wanted to know if it
is possible to Home brew the Interface needed between the computer and
the radio.  If so where can I find the information.

73, Jon

--
 _________    ______  ________
 ______  /    ___   |/  /___(_)_______ _____ ________
 ___ _  /     __  /|_/ / __  / __  __ \_  _ \__  ___/
 / /_/ /  ___ _  /  / /  _  /  _  / / //  __/_  /
 \____/   _(_)/_/  /_/   /_/   /_/ /_/ \___/ /_/

 Email: [e-mail]   WWW: http://www.j51.com/~richard
 Amateur Packet: N2XFZ@W2DMC.#eny.ny.usa.noam
 Finger [e-mail] for PGP Public Key and Info


From [e-mail] Fri Aug 16 15:36:23 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (John D. Seney, WD1V,   LeCroy T&M   800.553.2769)
Subject: Digital Scope.FAQ - How to Receive
Message-ID: <[e-mail]>
Organization: MV Communications, Inc.
Date: Fri, 16 Aug 1996 10:49:59 GMT
X-Nntp-Posting-Host: wd1v.mv.com
Lines: 39



            KEY ISSUES REVIEWED IN THE FAQ (in order of appearance)

  * DSO INDUSTRY TRENDS       (Whats happening in DSO technology this year?)
  * DSO FORM FACTORS          (What types of DSOs are there?)
  * PRIMARY DSO FUNCTIONS     (What can DSOs actually do?)
  * COMPARISONS               (How can I best compare various models)
  * APPLICATIONS              (What are the most common DSO applications?)
  * ADCs                      (What speed do I really need on each channel?)
  * BANDWIDTH & TRIGGER       (What numbers and functions are right?)
  * ARCHIVAL & MEMORY         (How fast, how deep, and can I get more?)
  * DISPLAYS                  (What am I really looking at?)
  * MEASUREMENTS              (How much is my signal changing over time?)
  * DIGITAL SIGNAL PROCESSING (How can I obtain more useful information?)
  * DEMOS & PURCHASING        (How can I see and get the DSO I really need?)

IF... you want the complete version
of this Digital Scope.FAQ file sent
to you automatically as an
ATTACHED TEXT FILE <35k TEXT File>.

send me ([e-mail]).........
an EMAIL where the subject contains
the text "subscribe scope.faq".....

or

go to my Home Page.

Best regards,

            John D. Seney |_|_|_|_| [e-mail]
        144 Pepperidge Dr |_|   |_| page [e-mail]
Manchester, NH 03103-6150 |_|_ _|_| [e-mail]
  voice mail 603.533.3472 | | | | | fax [phone]

                    www.mv.com/ipusers/wd1v
            Digital Scope.FAQ + Application Notes


From [e-mail] Fri Aug 16 15:36:24 1996
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From: AC6V <[e-mail]>
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.shortwaverec.radio.amateur.misc
Subject: FCC Antenna Doc on WWW
Date: Thu, 15 Aug 1996 20:26:44 -0700
Organization: Author
Lines: 27
Message-ID: <[e-mail]>
References: <4u8u23$[e-mail]> <4ubedc$[e-mail]> <[e-mail]> <4ulrpr$[e-mail]> <[e-mail]> <n9jig-1508962030430001@0.0.0.0>
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To: Rich Carlson <[e-mail]>
Xref: news2.epix.net rec.radio.amateur.misc:105952 rec.radio.amateur.digital.misc:16702 rec.radio.amateur.policy:35905 rec.radio.amateur.homebrew:16420 rec.radio.scanner:55128

Rich Carlson wrote:
>
> Does anyone have the text of this ruling?  I am trying to get my townhouse
> association to allow a DBS dish and a discone for scanning on my roof, and
> this may help push me over the edge as it were...
>
> --
> Rich Carlson, N9JIG ([e-mail])

Hi Rich, all 30 pages of the FCC text are to be found at URL:

http://www.fcc.gov/Bureaus/Cable/Orders/fcc96328.txt

Part of the FCC page at URL:
http://www.fcc.gov/

Lets all hope they extend this ruling to the Amateur Radio Service.

Good Luck with the HOA -- mine is hopeless.

73
Rod

--
Hark for I have hurled my words to the far reaches of the earth!
What King of old could do thus??
..... AC6V


From [e-mail] Fri Aug 16 15:36:25 1996
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From: duane <[e-mail]>
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.shortwaverec.radio.amateur.misc
Subject: Re: FCC Ruling Prohibits Unreasonable Restrictions on TV Antennas
Date: Mon, 12 Aug 1996 22:33:08 -0400
Organization: personal
Lines: 40
Message-ID: <[e-mail]>
References: <4u8u23$[e-mail]> <4ubedc$[e-mail]> <[e-mail]> <4ulrpr$[e-mail]>
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To: Bill Newkirk <[e-mail]>
Xref: news2.epix.net rec.radio.amateur.misc:105893 rec.radio.amateur.digital.misc:16676 rec.radio.amateur.policy:35862 rec.radio.amateur.homebrew:16398 rec.radio.scanner:55028

Bill Newkirk wrote:
>
> In <[e-mail]>, "James F. Boehner, MD" <[e-mail]> writ
es:
> >Bill Sohl wrote:
> >> [e-mail] (Ed Mitchell) wrote:
> >> >In a major ruling, the FCC declared void local laws prohibiting
> ..
> >> >must be allowed to install TV antennas. Longer term this ruling may
> >> >have important ramifications for eliminating restrictions on Amateur
> >> >Radio antennas.
> >>
> >> Wow, do I have a couple of ideas for some QST articles
> >> that begin  with a title:  How to build a (enter your
> >> favorite band here) meter antenna that looks like a TV
> >> antenna :-)
>
> actually, wouldn't a TV antenna work for 6 and 220 without too much effort?
> and 2m might just work on an LP type antenna...will have to see if it's poss
ible
> to do some measurements....wouldn't expect there to be too much modification
> needed for the use of an existing TV antenna as a transmitting antenna in
> the amateur service -- short of adding a balun (6:1 for 300:50 transformatio
n) and
> maybe doing some minor changes to the element lengths.
>
> >>
> >> Bill Sohl  K2UNK
> >> ARRL Local Gov't Liaison, Mt. Olive Township, NJ
> >
> >How about a sky of aluminum with a $40 Radio Shack Antenna on top?
> >YES!!!!!
> >73 de JIM N2ZZ
>
> i wouldn't push it too much as first until things become established for joe
 sixpack
> to have antennas up again.
>
> 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.
let me ask you something bill if i work ssTV on the hf freqs does that
make it a tv antenna ? After all Iam receiving T.V.!


From [e-mail] Fri Aug 16 15:36:26 1996
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From: "Jim O'Connell, W9WU" <[e-mail]>
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.shortwaverec.radio.amateur.misc
Subject: Re: FCC Ruling Prohibits Unreasonable Restrictions on TV Antennas
Date: Fri, 16 Aug 1996 10:24:13 -0700
Organization: Netcom
Lines: 23
Message-ID: <[e-mail]>
References: <4u8u23$[e-mail]> <4ubedc$[e-mail]> <[e-mail]> <4ulrpr$[e-mail]> <[e-mail]> <n9jig-1508962030430001@0.0.0.0>
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To: Rich Carlson <[e-mail]>
Xref: news2.epix.net rec.radio.amateur.misc:105954 rec.radio.amateur.digital.misc:16703 rec.radio.amateur.policy:35909 rec.radio.amateur.homebrew:16421 rec.radio.scanner:55143

Rich Carlson wrote:
>
> Does anyone have the text of this ruling?  I am trying to get my townhouse
> association to allow a DBS dish and a discone for scanning on my roof, and
> this may help push me over the edge as it were...
>
> --
> Rich Carlson, N9JIG ([e-mail])
>
> ScannerMaster Illinois Communications Guide [phone]
>
> CARMA (Chicago Area Radio Monitoring Association) BBS [phone]
> PO Box 2681, Glenview IL 60025    SASE for sample newsletter.

Rich: A copy of the Report and Order In the Matter of Preemption
of Local Zoning Regulation of Satellite Earth Stations
can be downloaded or read at http://www.fcc.gov

Look for it in the headlines section on the first page for the
link.  I'm not sure it will help you if you're in a townhouse and
don't own any roof/outside wall rights.

73, Jim O'Connell, W9WU  ARRL Volunteer Counsel


From [e-mail] Fri Aug 16 15:36:27 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-ana-7.sprintlink.net!news.sprintlink.net!news-fw-22.sprintlink.net!news.sprintlink.net!news-stk-3.sprintlink.net!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!howland.erols.net!news1.erols.com![e-mail]
From: Jake Brodsky <[e-mail]>
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.shortwave
Subject: Re: FCC Ruling Will Require Some Hams to File Environmental Impact Reports
Date: Mon, 12 Aug 1996 11:56:41 -0700
Organization: Wheeeeee!
Lines: 7
Message-ID: <[e-mail]>
References: <4u2uvk$[e-mail]> <4u7flm$[e-mail]> <4u7qbl$[e-mail]> <4uapth$[e-mail]> <[e-mail]>
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I'm just curious Gary, did you use a speaker mike all the time?  And
did you transmit with the radio on your belt?
--
Jake Brodsky, mailto:[e-mail]
PP-ASEL-IA, Cessna Cardinal N30946, Based @ MD24
Amateur Radio Station AB3A
"Beware of the massive impossible!"


From [e-mail] Fri Aug 16 15:36:28 1996
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From: "Bill Turner, WB4ALM" <[e-mail]>
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.shortwave
Subject: Re: FCC Ruling Will Require Some Hams to File Environmental Impact Reports
Date: Wed, 14 Aug 1996 21:50:20 -0400
Organization: Amateur Radio Station WB4ALM
Lines: 14
Message-ID: <[e-mail]>
References: <4u2uvk$[e-mail]> <4u7flm$[e-mail]> <4u7qbl$[e-mail]> <4uapth$[e-mail]> <[e-mail]>
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Gary Sanders wrote:
>

> Cancer isn't any fun.
>
> Sure, I know I'll get flamed, because I don't _know_ that the cancer
> was caused by the HT's, but then again, I don't _know_ that thay
> _didn't_ cause it.

Hopefully it WASN'T caused by the HT's...
...but even much more important, hopefully you recover. FULLY!
   (and quickly.)

73's Bill Turner, WB4ALM


From [e-mail] Fri Aug 16 15:36:29 1996
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From: [e-mail] (Curt Phillips)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.shortwave
Subject: Re: FCC Ruling Will Require Some Hams to File Environmental Impact Reports
Date: Wed, 14 Aug 1996 21:48:35 GMT
Organization: Interpath
Lines: 30
Message-ID: <4uth60$[e-mail]>
References: <4u2uvk$[e-mail]> <4u7flm$[e-mail]> <4u7sfb$[e-mail]> <4ua2jr$[e-mail]>
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[e-mail] (Gary Fiber) wrote:
>[e-mail] wrote:
>>>>The FCC has issued new rules regarding the evaluation of RF Emissions and
>>>>health effects from all transmitters. As always, the devil is in the detai
ls
[snip]
>>Oh knowledge of the affair isn't really required!  Product liability, for ex
ample
>>transcends all reasonable sane limits for time elapsed on that, with or with
out
>>knowledge.
[snip]
>It might be the manufacturers will have to apply a warning label on equipment
>to remind the installer / user of the possiable electromagnetic radiation
>problems of improperly installed equipment.
[snip]
>I would guess this might also be a good case for antenna heighth.  The higher
>the radiating element the less signal affects the  immediate surrounding area

  YEAH!!!!!  That's the ticket.  Not only can they NOT restrict you
from having a tower, you MUST have at least, say, a 100 foot tower.

  If you can't afford one, the government must assist you in getting
one... today FOOD STAMPS, tomorrow TOWER STAMPS!!  :-)

========== Opinions expressed are solely those of the author =========
Curt Phillips, CEM KD4YU (ex-WB4LHI)  |   Hey, cut me some slack!
 Engineer/Writer/Adventurer/Raconteur |   This is just the
Chairman, Tar Heel Scanner/SWL Group  |      BETA-TEST
ARRL Life; QCWA; Raleigh ARS; NRA; AEE|   version of me.
== [e-mail] ==== [Copyright 1996 All rights reserved]==




From [e-mail] Fri Aug 16 15:36:31 1996
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From: [e-mail] (Gary Fiber)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.shortwave
Subject: Re: FCC Ruling Will Require Some Hams to File Environmental Impact Reports
Date: Fri, 09 Aug 1996 12:51:21 GMT
Organization: Northwest Nexus Inc.
Lines: 35
Message-ID: <4ufchm$[e-mail]>
References: <4u2uvk$[e-mail]> <4u7flm$[e-mail]> <4uacqb$[e-mail]> <[e-mail]>
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[e-mail] (Michael L. Ardai) wrote:

>In article <4uacqb$[e-mail]> Ed Hare <[e-mail]> writes:
>-The VAST majority of amateur stations are already in compliance with
>-these rules.

>Does it include those (MANY) of us who *CANT* put up a tower; who operate
>with apartment balcony antennas or wires attached to houses?  I can just
>see all the city boards gleefully getting rid of ham radio with the
>"We won't allow a tall tower, and the FCC won't allow power with a low
>antenna" opinions.  I guess it is time to dust off the HW-8.

>We are trying to promote ham radio other than 2M thru repeaters, and now
>we get socked with this.  Or will it be like all those 300 watt Italian
>stations...

>/mike
>(Does the negative gain from my windowsill-mounted hamstick reduce my
>100W to a safe level :-)

>--
>\|/     Michael L. Ardai        N1IST       [e-mail]     \|/
>-*- === Boston Amateur Radio Club:  http://www.barc.org/barc === -*-
>/|\       or send "info barc-list" to [e-mail]        /|\

In this thread there has been mentioned of the FCC study on this issue.  A
number of months ago I downloaded this " article "  for work it prints out to
be over 70 pages. We have nbeen looking at this issue for  a while now
casually.  It was worth the time to download , lots of information  was
surprized to see how many typre of antennas the FCC used for testing and the
tables and charts with test results included..
Download and print it today.  Take a few nights to read and digest it.

Gary



From [e-mail] Fri Aug 16 15:36:32 1996
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From: [e-mail] (Mike Suhar)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: fft ANALYZER INFO NEEDED
Date: 12 Aug 1996 17:12:27 GMT
Organization: LEXIS-NEXIS
Lines: 31
Distribution: world
Message-ID: <4unolr$[e-mail]>
References: <4ucq9p$peo$[e-mail]> <[e-mail]>
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In article <[e-mail]>, [e-mail] says...
>
>viny Coppola wrote:
>>
>> Need an FFT analyzer program that runs on a PC/soundcard that will not
average
>>
>> and entire waveform, but allow the observance of the spectra of a part of
the
>w
>>
>> aveform. Does anybody know if such software exists as shareware or
commerciall
>y
>>
>> ?
>>
>> Thanks beforehand
>>
>> Viny Coppola N1VC
>
>If my memory is good the program below is
>an FFT using a sound blaster card:
>arrl ftp server bbs.programs
>
>http://oak.oakland.edu:8080/pub/hamradio/arrl/bbs/programs/fftmorse.zip
Try AF9Y's FFTDSP software.  You can download a demo from his web site.  His
web site is:  www.webcom.com:80/~af9y

Mike, WB8GXB



From [e-mail] Fri Aug 16 15:36:33 1996
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From: [e-mail] (Jim Johnson)
Newsgroups: rec.radio.amateur.homebrew
Subject: FS:KPC-3 Upgrade Kits.
Date: Wed, 14 Aug 1996 06:59:06 GMT
Organization: AT&T WorldNet Services
Lines: 14
Message-ID: <4urthl$[e-mail]>
NNTP-Posting-Host: 231.seattle-1.wa.dial-access.att.net
X-Newsreader: Forte Free Agent 1.0.82

I have posted this earlier and got some response and sold a few of
these kits.  I still have about 6 of them for sale.

These kits contain the 128K X 8 Memory upgrade for the KPC-3 along
with the DS1215 Clock/Calendar and the 32.768KHz Crystal needed for
the clock.  I am selling these kits for $15 which includes postage.

I will guarantee the parts to work.  If interested please reply via
E-Mail.

73, Jim N7XTY (I am good in the callbook)





From [e-mail] Fri Aug 16 15:36:36 1996
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From: [e-mail] (Ed Mitchell)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.shortwave
Subject: Ham Radio Online web site is still "on the air"
Date: 11 Aug 1996 22:15:43 GMT
Organization: Virtual Publishing Co.
Lines: 26
Message-ID: <4ulm2f$[e-mail]>
NNTP-Posting-Host: vbook.accessone.com
X-Newsreader: WinVN 0.99.5
Xref: news2.epix.net rec.radio.amateur.misc:105914 rec.radio.amateur.digital.misc:16684 rec.radio.amateur.policy:35884 rec.radio.amateur.homebrew:16406 rec.radio.scanner:55076 rec.radio.shortwave:77762

The Ham Radio Online web is still "on the air." However, our new web server
located in California's Silicon Valley lost power during the massive west coas
t
power outage this weekend and as of Sunday morning (U.S.) 11 August the http
web server is still not functioning. Our ftp access to the web site came back
up this morning so we've updated the files. We assume the web server will be
brought back online by Monday.

You can access the Ham Radio Online web site at:
     http://206.13.40.11/
(www.hamradio-online.com when InterNIC gets their directory updated.) You can
also check for updates at our backup web address:
     http://www.accessone.com/~vbook/hronline.htm

We've completely redesigned the "List of Other Ham Radio web sites",
"Commercial Products Directory" and the Ham Radio Online Library for easier
access to all the information that is stored online. It really looks cool and
we had a lot of fun learning how to use "frames" for the web pages.

Thanks!
Ed, KF7VY
------------------------
Ed (KF7VY) and Kim (N7VPL) Mitchell
email to [e-mail]
Visit Ham Radio Online, it's free! at
http://www.hamradio-online.com



From [e-mail] Fri Aug 16 15:36:37 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!realtime.net!news.mindspring.com!newspump.sol.net!news.inc.net!uwm.edu!math.ohio-state.edu!howland.erols.net!agate!newsgate.duke.edu!news-feed-1.peachnet.edu!hobbes.cc.uga.edu!news
From: [e-mail] (Ignacy Misztal)
Newsgroups: rec.radio.amateur,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: HELP: IS PC SWITCHING POWER SUPPLY OK???
Date: 14 Aug 1996 14:28:40 GMT
Organization: University of Georgia
Lines: 22
Message-ID: <4usnqo$[e-mail]>
References: <4ulu2o$[e-mail]>
Reply-To: [e-mail] (Ignacy Misztal)
NNTP-Posting-Host: num.ads.uga.edu
X-Newsreader: IBM NewsReader/2 v1.00
Xref: news2.epix.net rec.radio.amateur.equipment:31671 rec.radio.amateur.homebrew:16412 rec.radio.amateur.misc:105922

In <4ulu2o$[e-mail]>, [e-mail] (Big Boy) writes:
>I have a old crap 8088 'tole box' as you can say!  With the power supply.  It
's
>rated 7Amp at 12 Volts but i'm wandering if i can use it to supply my mobile
>(used as a base) 13.8V tranceiver unit.  I dont know much of switching power
>supply technology and i want to know if it's safe.  The problem may be when i
>switch from RX to TX and from TX to RX... could there be a fatal burst of
>voltage?  Or peraps with a big cap, like 22 000uF, at the exit i can control
>those peek?

One problem with switching powel supplies is wideband noise. I used a
stock Yaesu switching PS a while ago, and with low and
shortened antennas the noise was overwhelming. It was OK with high
full-sized antennas.

That PS once gave up at a thunderstorm, something that has never
happend with the conventional PS.

Ignacy Misztal              Ham radio: NO9E, SP8FWB
E-mail: [e-mail]
University Of Georgia, 203 L-P Bldg., Athens, GA 30602
tel. [phone]



From [e-mail] Fri Aug 16 15:36:38 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-ana-24.sprintlink.net!news.sprintlink.net!news-stk-3.sprintlink.net!news.sprintlink.net!news-stk-11.sprintlink.net!nntp04.primenet.com!news.shkoo.com!nntp.primenet.com!tank.news.pipex.net!pipex!news.be.innet.net!INbe.net!news.nl.innet.net!INnl.net!hunter.premier.net!news-res.gsl.net!news.gsl.net!usenet.eel.ufl.edu!news.bright.net!chil6-cs-3.dial.bright.net!user
From: [e-mail] (Charles)
Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.antenna,rec.radio.amateur.misc
Subject: Re: how can I broadcast on FM radio?
Date: Wed, 07 Aug 1996 11:18:32 -0400
Organization: BrightNet Ohio
Lines: 20
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: chil6-cs-3.dial.bright.net
Xref: news2.epix.net rec.radio.amateur.policy:35850 rec.radio.amateur.equipment:31616 rec.radio.amateur.homebrew:16382 rec.radio.amateur.antenna:23567 rec.radio.amateur.misc:105873

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

> Could someone point towards info on how to broadcast on FM radio.
> I've heard it called free radio or pirate radio. Does that mean it's
> illegal (how illegal:)? What makes it illegal (in florida)? Where can I
> buy the equipment? What would I need to buy? I just want to transmit 5
> to 10 miles and just music (mostly my own and my friends music so as not
> to violate copyrights or whatever).
>
They call it PIRATE RADIO because they hang Pirates when they catch them.
That is what the FCC will do if you are caught broadcasting music 5-10
miles on FM Radio without a license. Amateur radio regulations prohibitthe
broadcast of music. Other broadcast of music requires a commercial
broadcast license. You are facing fines ranging from $2000 to $15000 if
you are caught, which means free radio is only free until you are caught.
These are serious fines, the FCC does noto mess around with parking ticket
size penalties. If you choose to use amateur radio FM equipment, licensed
amateurs will quickly track you down and report you to the FCC. Tracking
illegal stations is an Amateur radio hobby/sport.
Charles


From [e-mail] Fri Aug 16 15:36:39 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-dc-5.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!nntp.primenet.com!ddsw1!news.mcs.net!chi-news.cic.net!newspump.sol.net!spool.mu.edu!usenet.eel.ufl.edu!news-res.gsl.net!news.gsl.net!ix.netcom.com!news
From: [e-mail](MIKE)
Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.antenna,rec.radio.amateur.misc
Subject: Re: how can I broadcast on FM radio?
Date: 12 Aug 1996 02:20:08 GMT
Organization: Netcom
Lines: 18
Message-ID: <4um4co$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: wfd-nj4-40.ix.netcom.com
X-NETCOM-Date: Sun Aug 11  7:20:08 PM PDT 1996
Xref: news2.epix.net rec.radio.amateur.policy:35854 rec.radio.amateur.equipment:31630 rec.radio.amateur.homebrew:16388 rec.radio.amateur.antenna:23573 rec.radio.amateur.misc:105886

In <[e-mail]> robert <[e-mail]> writes:
>
>Could someone point towards info on how to broadcast on FM radio.
>I've heard it called free radio or pirate radio. Does that mean it's
>illegal (how illegal:)? What makes it illegal (in florida)? Where can
I
>buy the equipment? What would I need to buy? I just want to transmit 5
>to 10 miles and just music (mostly my own and my friends music so as
not
>to violate copyrights or whatever).
>
>-- you would first have to apply to the fcc for a license,, otherwise
it is illegal!!  first apply and then take it from there,,there are
hundreds of guidelines that must be followed,,good luck,,youll need
it!!  (and money too!!)
>______________________
>robert mailto:[e-mail]



From [e-mail] Fri Aug 16 15:36:40 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.monad.net!news.sover.net!imci2!pull-feed.internetmci.com!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!munnari.OZ.AU!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: Inductance meter schematic
Date: Tue, 13 Aug 1996 09:51:30
Organization: TRL
Lines: 26
Message-ID: <[e-mail]>
References: <4ua61i$[e-mail]> <[e-mail]>
NNTP-Posting-Host: pcies4.trl.oz.au
Keywords: inductance meter
X-Newsreader: Trumpet for Windows [Version 1.0 Rev Final Beta #7]

>In article <4ua61i$[e-mail]> [e-mail] writes:
>>From: [e-mail]>Subject: Inductance meter schematic
>>Date: Wed, 07 Aug 1996 13:35:10 GMT> Do anyone out there have a shematic for

>an easy build and good>working inductance meter !?>

If you only need to measure in the microhenry range, see

"The Handy Inductance Bridge" by KB4ZGC, in 73 Amateur Radio, May '91.

Remembered two more inductance articles (and which may be easier to build than

the one above);

"Easy to Build Inductance Meter" by Ed Marriner W6XM in Ham Radio (USA); Apr
'82. Uses discrete components, with no fancy parts,

and

"Simple Inductance Meter" by Frank Brumbaugh KB4ZGC in 73 Amateur Radio; June
'96. Again, no fancy parts.

73, Drew, VK3XU.







From [e-mail] Fri Aug 16 15:36:41 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.inc.net!uwm.edu!cs.utexas.edu!howland.erols.net!vixen.cso.uiuc.edu!newsfeed.internetmci.com!in3.uu.net!interaccess!usenet
From: L=?iso-8859-2?Q?=E1szl=F3?= Aranyos <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: It was me sorry
Date: Mon, 12 Aug 1996 06:55:30 -0500
Organization: InterAccess, Chicago's best Internet Service Provider
Lines: 1
Message-ID: <[e-mail]>
NNTP-Posting-Host: d147.loop.interaccess.com
Mime-Version: 1.0
Content-Type: text/plain; charset=iso-8859-2
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.02 (Win95; I)
CC: [e-mail]

I figured this Newsreader out problem was here sorry


From [e-mail] Fri Aug 16 15:36:42 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news-res.gsl.net!news.gsl.net!portc01.blue.aol.com!newsxfer2.itd.umich.edu!newsfeed.internetmci.com!in2.uu.net!interaccess!usenet
From: L=?iso-8859-2?Q?=E1szl=F3?= Aranyos <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Kenwood Ts-50s
Date: Mon, 12 Aug 1996 06:15:25 -0500
Organization: InterAccess, Chicago's best Internet Service Provider
Lines: 1
Message-ID: <[e-mail]>
NNTP-Posting-Host: d147.loop.interaccess.com
Mime-Version: 1.0
Content-Type: text/plain; charset=iso-8859-2
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.02 (Win95; I)
CC: [e-mail]

Nedd all mods for Kenwwod Ts-50s please post or e-mail Tnx....


From [e-mail] Fri Aug 16 15:36:43 1996
From: [e-mail] (Christer Johansson)
Newsgroups: comp.robotics.misc,comp.home.automation,sci.electronics.misc,rec.radio.amateur.homebrew
Subject: L.O.S.A Contribution Form
Date: Tue, 13 Aug 1996 17:38:47 GMT
Organization: HTH
Reply-To: [e-mail]
X-Newsreader: Forte Free Agent 1.0.82
NNTP-Posting-Host: modem23.sverige.net
Message-ID: <[e-mail]>
Lines: 58
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.voicenet.com!netnews.upenn.edu!dsinc!newsfeed.pitt.edu!godot.cc.duq.edu!newsgate.duke.edu!news.mathworks.com!newsfeed.internetmci.com!swrinde!howland.erols.net!surfnet.nl!newsfeed.sunet.se!news00.sunet.se!sunic!mn6.swip.net!seunet!news2.swip.net!news.buller.se!
Xref: news2.epix.net comp.robotics.misc:6321 comp.home.automation:19191 sci.electronics.misc:8372 rec.radio.amateur.homebrew:16403

List Of Stamp Applications (L.O.S.A for short)
==============================================

If you have done something (big or small) with the BASIC Stamp
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.hth.com/losa.htm

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.misc
rec.radio.amateur.homebrew

FTP-site:

     ftp://ftp.parallaxinc.com/pub/text/losa.txt

You can also find the latest version on the following URL...

     http://www.hth.com/losa.htm


[--- 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

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
 * High Tech Horizon  -  Christer Johansson  -  E-mail: [e-mail] *
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
 * Vi saljer Parallax, Inc. BASIC Stamp's produkter i Skandinavien *
     >>  World Wide Web On-Line Catalog - http://www.hth.com  <<
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-



From [e-mail] Fri Aug 16 15:36:44 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-dc-5.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!news.sgi.com!news.msfc.nasa.gov!newsfeed.internetmci.com!in2.uu.net!ns2.spectra.net!news
From: John Clark <[e-mail]>
Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew
Subject: Re: N6GN Microwave Data Link
Date: Thu, 08 Aug 1996 00:32:41 -0400
Organization: Clarkson University
Lines: 14
Message-ID: <[e-mail]>
NNTP-Posting-Host: pm201.spectra.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0b6Gold (X11; I; Linux 2.0.10 i586)
Xref: news2.epix.net rec.radio.amateur.digital.misc:16674 rec.radio.amateur.homebrew:16395

In response to N6GN's question about receiver board schematic errors:

Oh, I found more than those 3 errors...  I emailed you (N6GN) a list of
the ones I found, but your machine, sr.hp.com, seems to be down as far
as I can tell (ping, traceroute, etc..)

Oh, and while I'm here, can anyone tell me how I can get 75 and 100 nH
inductors for this project?  Do I have to wind them, or can I buy them?
I looked through Digi-Key's August catalog, but the only 75's I could
find are surface mount....

Thanks.

- John (N3IFG)


From [e-mail] Fri Aug 16 15:36:45 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!news.sgi.com!swrinde!sdd.hp.com!col.hp.com!canyon.sr.hp.com!glenne
From: [e-mail] (Glenn Elmore)
Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew
Subject: Re: N6GN Microwave Data Link
Followup-To: rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew
Date: 8 Aug 1996 15:43:42 GMT
Organization: Hewlett Packard Sonoma County
Lines: 76
Message-ID: <4ud1ve$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: n6gn.sr.hp.com
X-Newsreader: TIN [version 1.2 PL2.2]
Xref: news2.epix.net rec.radio.amateur.digital.misc:16686 rec.radio.amateur.homebrew:16409

John Clark ([e-mail]) wrote:
: In response to N6GN's question about receiver board schematic errors:

: Oh, I found more than those 3 errors...  I emailed you (N6GN) a list of
: the ones I found, but your machine, sr.hp.com, seems to be down as far
: as I can tell (ping, traceroute, etc..)

I *did* just get the mail.  My machine is behind a firewall which is the
reason you don't find end-end IP connectivity with it.  Your list
seems to be of differences between the layout/assembly information
on the web pages and the schematic(s) published by the ARRL.  It appears
that the differences are all "errors" of the layout rather than the
schematic.

-----------------------------------------------------------------------
> Well, here are some I've noticed by comparing the schematic with the
> printed board layout and part placement diagram I downloaded from your
> web site:
>       1) Q3 and Q4 are switched
>       2) The 20K resistor between the base and emitter of Q3
>          (formerly Q4) is a 147 on the part placement diagram
>       3) The pins on U5 are switched between U5A and U5B
>       4) Connector P1 is wired very, very differently, esp. pins 6,7,8
>       5) The MAR-6 is labelled U7 and it should be U9
>       6) Connector P2 is wired differently (look at pin 4)
>       7) There is a 9 pin D-SUB connector on the layout that
>          presumably for the microwave board but isn't on the
>          schematic
>
> There might be more; I haven't checked everything yet...
-----------------------------------------------------------------------

These all seem to be issues specific with that particular (older) ARRL
layout.

(1) both devices are the same 2n2222 so it doesn't matter anyway
(2) schematic is correct
(3) dual opamps in the same package. Doesn't matter.
(4) I think this was changed at the ARRL when they (re)laid the board.
    the schematic  in my 1991 Handbook shows things OK, as far as I
    can tell.
(5) It's labeled U8 on the schematic I have.
(6) It appears to be shown correctly in the Handbook schematic.
(7) The ARRL layour used a different connector type but on the one
    set of their boards I loaded, both the rx and uwave ends are working
    with a ribbon (soldered, not connectored) between them) I think this
    was done because they didn't have the connectors I used available.


Perhaps someone who has assembled a transceiver using the FAR Circuit
board set can comment.  I have never even seen any board sets except
the early ones from the ARRL.  The original four transceivers I built
were all hand wired.  I did load and test the ARRL board set though and
it worked, with a couple of corrections.  I believe that the corrected
schematic (corrections as listed on the web page) is suitable for making
all necessary corrections to the Handbook schematic. If this is not the
case, I'd appreciate hearing about it.

  Thanks for taking time to list these, I don't know if anyone else is
presently trying to use the layouts to build their own boards. Perhaps
they can comment on any other corrections to that artwork.
If more are found, please indicate and I'll put them where everyone can
see them.

Has anyone had recent experience with the FAR boards or other layouts?

Glenn Elmore n6gn

amateur IP:     [e-mail]
Internet:       [e-mail]

|--------------- N6GN's Higher Speed Packet WWW Page -------------------|
|                                                                       |
|       http://www.tapr.org/~n6gn/index.html            |
|                                                                       |
|-----------------------------------------------------------------------|


From [e-mail] Fri Aug 16 15:36:46 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news-res.gsl.net!news.gsl.net!usenet.eel.ufl.edu!spool.mu.edu!munnari.OZ.AU!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Lawrence Stoskopf)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need data: Anzac MD-112-3
Date: 11 Aug 96 05:50:07 GMT
Organization: ucsd usenet gateway
Lines: 12
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

I posted this several months ago, but will try again.

Picked up an Anzac MD-112-3 mixer at Dayton this year.  .01 to 12 GHz

Schematic on case, but requires diode bias thru 10 ohm resistors coupled to
an SMA connector.  Anyone have a data sheet or bias ideas?

Thanks

Lawrence E. Stoskopf, M.D.
N0UU



From [e-mail] Fri Aug 16 15:36:47 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-ana-7.sprintlink.net!newsfeed.internetmci.com!tank.news.pipex.net!pipex!nntp.primenet.com!news.cais.net!news2.cais.com!news
From: "James Van Houten" <[e-mail]>
Newsgroups: rec.ham-radio,rec.ham-radio.packet,rec.ham-radio.swap,rec.radio,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec
Subject: New Ham Radio Discussion Area on the Web!
Date: 13 Aug 1996 04:32:42 GMT
Organization: J. D. Van Houten & Associates
Lines: 18
Message-ID: <01bb88d0$b49bb8e0$[e-mail]>
NNTP-Posting-Host: vh-t3-home.jdvh.com
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
X-Newsreader: Microsoft Internet News 4.70.1141
Xref: news2.epix.net rec.radio.amateur.antenna:23589 rec.radio.amateur.digital.misc:16677 rec.radio.amateur.dx:194 rec.radio.amateur.homebrew:16400 rec.radio.amateur.misc:105898 rec.radio.amateur.policy:35863 rec.radio.amateur.space:7381

Hello All,

Will keep it short and to the point.  There is a new resource for Ham radio
topics.  It is on the web.  Come on over and visit
http://www.coronetsec.com/hamradio.  All hamradio topics welcome.  Hope to
see you there soon.

Jim
KA3TTU

ps.  Don't forget to tell all of your non-newsgroup readin' friends!!  :-)
--
----------------------------------------------------------------------------
----------
James Van Houten     http://www.coronetsec.com/hamradio
----------------------------------------------------------------------------
----------



From [e-mail] Fri Aug 16 15:36:48 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsfeed.internetmci.com!news.inc.net!news
From: Will Flor <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NVI antennas..Any one here used one...???
Date: Mon, 12 Aug 1996 14:09:38 -0500
Organization: The R R Systems Group, Inc.
Lines: 14
Message-ID: <[e-mail]>
References: <4uhrr2$[e-mail]>
NNTP-Posting-Host: 204.95.173.139
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0 (WinNT; I)

Gary Robison wrote:
>
> If you have used a NVIA let me know how it worked for you....I am in
> RACES and need only to cover Western PA this type of antenna looks like
> what I need....
>

Yes, the famous "low dipoles" work great for NVIS propagation.  In
the military, this is done frequently with whips tied over into a
semicircle.  For good, short- to medium-range communications with
no skip zone, they can't be beat, as long as the guy you're trying
to talk to doesn't have a vertical! ;-)

-Will Flor        [e-mail]


From [e-mail] Fri Aug 16 15:36:49 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-ana-24.sprintlink.net!news.inc.net!uwm.edu!news-res.gsl.net!news.gsl.net!portc01.blue.aol.com!newsxfer2.itd.umich.edu!uunet!in2.uu.net!EU.net!sun4nl!cuci.nl!usenet
From: Peter_Janssen <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Pi- and T-filters
Date: Sun, 11 Aug 1996 15:54:56 +0200
Organization: Cubic Circle
Lines: 9
Message-ID: <[e-mail]>
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I want to construct some High-Pass and Band-Pass filters for HF/VHF-freq.
For the caLculations I use the shareware-program FILTRY20.
In the program I can choose between a Pi- and a T-filter configuration. Both
give the same function (for example High-Pass), freq., impedance, etc.
Generally T-filters are easier to build: less L's, more C's. Can I choose
between Pi- and T-configurations on this practical ground or is there a
difference in performance between Pi- and T-filters which is not mentioned by
the program?
wkr   Peter Janssen


From [e-mail] Fri Aug 16 15:36:50 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!interaccess!usenet
From: L=?iso-8859-2?Q?=E1szl=F3?= Aranyos <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: postings vanish
Date: Mon, 12 Aug 1996 06:32:46 -0500
Organization: InterAccess, Chicago's best Internet Service Provider
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Am I doing somthing wrong I post an item it appears than it vanishes .
Is there cecorship on this group?


From [e-mail] Fri Aug 16 15:36:51 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re:Repeater College Project
Date: 12 Aug 96 21:25:34 GMT
Organization: ucsd usenet gateway
Lines: 28
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

Mike Russel asked about a "simple" VHF repeater.
Mike:
        The hardest part of a repeater is going to be getting an
official repeater pair on any frequency below 450MHz.  Most places
those frequencies are full.  You might look at doing a 6 meter
repeater, since most places probably don't already have more than 1 or
2 repeaters on that band.

        The simplest way to do a repeater is to buy an inexpensive
separate tx board and rx board.  Probably the hardest RF part of a
repeater system design is getting the transmitter not to clobber the
receiver.  I would suggest that you look at ways to keep the 2
antennas separated both vertically and horizontally.  Since this is
*primarily* a learning experience and I suspect that cost is as much a
problem as anything,  you want to stay away from things like cavities
and other things necessary when using one antenna.  That way you can
concentrate your design efforts on the controller.  The *magic* of
repeaters is in the controller and the duplexor (that I just suggested
you not use).

        If you have specific questions as your project proceeds, there
will be plenty here with opinions for you.

Ray Mack
WD5IFS
[e-mail]
Friendswood (Houston), TX



From [e-mail] Fri Aug 16 15:36:52 1996
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From: [e-mail] (Tom Bratton)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Roanoke Doppler DF
Date: Mon, 12 Aug 1996 19:14:24 GMT
Lines: 33
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References: <[e-mail]> <[e-mail]>
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Randy Smith <[e-mail]> wrote:

>  Hello Tom,
>  I have built that unit (etched my own pcb) and it seems to work okay on
>the bench. I am NOT impressed with the performance in the real world
>though... Introduce some noise on the signal and the filter doesn't seem
>to work quite right. I know this doesn't answer your question, but it is
>all I know about it from personal experence. I do know someone else who
>built and currently uses his. It seems to work okay for him, although I
>have not looked at it with any test equipment... for all I know it could
>be doing the same thing mine is. Good luck!
>  Randy Smith

Thanks for your response, Randy.

I have not had chance to do much since I posted my question, but  I suspect R9
in the circuit diagram should perhaps be 22k, not 22 ohms.    22 ohms would on
ly
give a gain of about one in the passband.

I have a Dopler DF circuit that originated in "73" Magazine in the mid 80's th
at
I might try instead, if all else fails.  It is very similar to the Roanoke
circuit but uses 300Hz instead of 500Hz.    Also it used an RF summer instead
of
hard diode switching of the antennas - unfortunately there was no listing of t
he
PROM used to give the correct  bias to the FETs. I don't suppose it would be
available now, so  I might end up with a mixture of the two circuits.

Cheers.

Tom.






From [e-mail] Fri Aug 16 15:36:53 1996
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From: [e-mail] (John Hassell)
Newsgroups: rec.radio.amateur.homebrew
Subject: TCM2912DJ PCM Line Filter ICs-Info needed
Date: Mon, 12 Aug 1996 01:32:41 GMT
Lines: 9
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I picked up some TCM2912DJ PCM Line Filter ICs by Texas Instruments
but can't find any info. on them in TI catalogues or on the TI www
database. These are 16 pin DIL chips made in Japan. Can anyone help
with specs and pinouts. Many thanks.
--
John.A.Hassell VK6JAH
[e-mail]




From [e-mail] Fri Aug 16 15:36:54 1996
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From: Madjid VE2GMI <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: where to find ultrasonic sensor
Date: Mon, 12 Aug 1996 14:31:56 -0400
Organization: ORION
Lines: 21
Message-ID: <[e-mail]>
References: <01bb8598.fe59c5c0$fb99389d@DISCUS>
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Tom Kreyche wrote:
>
> I'm planning to build a detector for bats (the flying mammals!) probably
> for dumping into a laptop for some kind of spectral analysis. Anyone have
> recommendations for ultrasonic sensors? Different bat species use
> different frequencies, typically 40 kHz to 60 kHz, audio.
>
> BTW, I've seen some standalone commercial detectors for about $250 but
> it's no fun just buying one!
>
> Thanks, Tom KG6YJ

I buit one some years ago to detect sparks from Hydro poles
using a salvaged piezo cell from an old Jerrold cable converter.
You can also use a Piezo tweeter RS 40-1382.

There was an interesting circuit in the 1990 "Electronic
Hobbyist handbook" (Pop. Elect) using a 4066 quad bilateral
switch as a balanced mixer, 2 2N3904, 1 TL082, 1 LM386.
I think there was a mistake in one of the pinout in the
schematic the magazine gave.


From [e-mail] Wed Aug 21 13:32:55 1996
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From: [e-mail] (Dennis Edinger)
Newsgroups: rec.radio.amateur.homebrew
Subject: (none)
Date: 20 Aug 96 13:25:47 GMT
Organization: ucsd usenet gateway
Lines: 2
Message-ID: <[e-mail]>
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unsubscribe [e-mail]  Dennis L. Edinger
[e-mail]


From [e-mail] Wed Aug 21 13:32:56 1996
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From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 11 meter to 10 meter transverter......
Date: 19 Aug 1996 09:40:30 GMT
Organization: Comp.Center (RUS), U of Stuttgart, FRG
Lines: 12
Message-ID: <4v9cqe$[e-mail]>
References: <01bb8ae3$21d46ec0$ed15369d@wokka>
NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de

>I would like to make my 11 meter Uniden pc-244 transmit and receive on the
>10 meter amateur radio band.

Hi Eric,

A transverter that shifts RX/TX only by a small amount of frequency
is difficult do design, because you have to suppress the *image
frequency*. The common approach is to modify the 11m rig so that it works
on 10m.

73, Moritz DL5UH



From [e-mail] Wed Aug 21 13:32:58 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!nntp04.primenet.com!nntp.primenet.com!news.asu.edu!ennfs.eas.asu.edu!gatech!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: 2M CW or SSB XCVR Kit
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4v2ejs$[e-mail]> <4v9rjt$[e-mail]>
Date: Tue, 20 Aug 1996 13:43:48 GMT
Lines: 32

In article <4v9rjt$[e-mail]> [e-mail] (Curtis Sardeson) wri
tes:
>This is some followup information I have received via
>direct e-mail over the weekend:
>
>> It's not available as a kit as far as I know, but I'd recommend the
>KK7B
>> R2/T2 combination which Rick Campbell designed to work on 2 meters.
>It's
>> in May 1993 QST.
>
>(reading the article now)

Kanga does offer kits for the R2 and T2, but they are simple enough
that you can dead bug them instead. I don't like the analog filtering
and phase shifter so I used an Analog Devices EZ-Kit instead. Do a
Hilbert transform on one channel and you have a perfect quadrature
shift. Filter as desired for the modulation waveform used.

For the quadrature phasing of the LO at 2m, a simple coax delay
line works fine. I use a 1/4-wave (electrical) piece of RG-174
coiled up and tucked in the box with the LO buffers. I use MAR-4s
as buffers on the in-phase and quadrature outputs going to the SBL-1s.
I'm using a signal generator as the LO, but you'd want to build your
own LO for a packaged unit. A crystal VXO should be fine to cover
just the CW segment of 2m.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | Due to provider problems
Destructive Testing Systems |    we break it.     | with previous uucp address
es
534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Wed Aug 21 13:33:00 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 4-1000A Amp Schematics Wanted
Date: 14 Aug 1996 11:22:05 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 22
Sender: [e-mail]
Message-ID: <4usqut$[e-mail]>
References: <4urmo7$[e-mail]>
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In article <4urmo7$[e-mail]>, gbostick@luna (Gary Bostick (POS))
writes:

>In respect to the above characteristics, how would the  3-1000Z compare.
>This is also a impressive tube to look at and a great room warmer for
>those cold shacks.
>
>                                        Gary

Problem is they are rare and expensive. At the same anode voltage they
have more gain than the 4-1000A in GG (due to lower driving impedance).
They also have much better GG IMD performance.

They are very unstable compared to tubes like the 8877 or 3CX1200Z7 due to
long internal grid leads. This causes the self-neutralizing frequency to
be very low and complicates parasitic suppression if ten or 15 meter
operation is desired.

All of the problems can be handled, except the expense. Last one I saw at
a flea market was in the early 80's.

73 Tom


From [e-mail] Wed Aug 21 13:33:00 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: CAT system coputer control for yaesu FT 890 and FT 840 software
Date: Wed, 21 Aug 1996 11:53:58 GMT
Organization: ping - Personal InterNet Gate
Lines: 20
Message-ID: <4veta8$[e-mail]>
References: <[e-mail]>
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[e-mail] (claudio) wrote:



>73's and thank's for riding this message


>I need help on the software for the cat system to the tranceiver's
>YAESU FT 890 and FT 840.

>Please where can i find that software.

You can find the programm CATCC V1.00 on the QRZ! Ham Radio CD-Rom
Volume JAN1996,Vol.6

I have you sent a e-mail, I hope you get it !!!!!

vy 73      Karl




From [e-mail] Wed Aug 21 13:33:01 1996
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From: Roger Basford <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Commercial CW use
Date: Fri, 16 Aug 1996 07:52:45 +0100
Organization: Home
Lines: 36
Distribution: world
Message-ID: <[e-mail]>
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 <4uniqt$[e-mail]> <[e-mail]>
 <4v021c$[e-mail]>
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In article <4v021c$[e-mail]>, Don Montgomery
<[e-mail]> writes
>Will Flor ([e-mail]) wrote:
>
>> though the Coast Guard doesn't monitor for CW SOSs any more.
>
>I found this hard to believe - that the one agency that should monitor
>for CW distress signals doesn't.  I called the USCG monitoring station
>in Point Reyes, CA., and confirmed that they do not.

Here in the UK, British Telecom ship-to-shore stations stopped
monitoring 500 kHz last year and I believe Portishead Radio (who handle
long-distance HF communications to shipping) has also largely ceased CW
operations, although they still ID in CW on their SITOR circuits.

BT have also handed over their 2182 kHz R/T distress watch to the
Coastguard Agency who had only covered VHF CH16 until then. I worked for
a while recently as a volunteer assistant at our local CG SAR centre and
although there were several experienced CW operators there they had
learned the code in the military. It seems there is no longer a CW
requirement for persons wishing to become Coastguards in the UK.
>
>
>I wonder if CW will be dead after this generation, like landline morse?
>

I hope not, it will always have an application somewhere in radio I
think, even if only to ID other systems, but I think things like NAVTEX
and DSC will totally replace it in the Maritime Mobile Service.



                *///////////////////////////////////////*
                *   e-mail: [e-mail]   *
                * Roger Basford, Haddiscoe, Norfolk U.K.*
                *///////////////////////////////////////*


From [e-mail] Wed Aug 21 13:33:03 1996
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From: "John D. Farr" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Designing transformers
Date: Wed, 21 Aug 1996 01:25:22 -0500
Organization: RENAISSANCE INTERNET SERVICES
Lines: 30
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
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Woody White wrote:
>
> Kari Kuusinen wrote:
> >
> > Hi you all.
> >
> > Anybody know a good site where to find practical information
> > of RF-transformers for impedance matching. Especially HP-transormers
> > for 1:9 and 9:1 ratios capable of handling up to 600 W CW. Also
> > information about different core materials needed and where to obtain
> > those cores. I need those to build up an linear for 2-30 MHz using
> > 4 of MRF150/MRF140 FETs (600 W CW out).
> >
> > 73 de OH1DX / OH2LIG / Kari
>
> Try the ARRL page (American Radio Relay League) publications page.
> I believe there is a book available dealing with such transformers.
> 73,
> --
> de  Woody (WB4QXE) -  [e-mail]
> Electron Microscopist/Microanalysist,
> Ham radio "homebrewer", shade tree mechanic,
> '90 Nissan 240SX, wish still had my Mcycle too!
> .


The book is entitled "Transmission Line Transformers" by Jerry Sevick,
W2FMI. Was 20 bucks when I got mine.

John KC4ZXX


From [e-mail] Wed Aug 21 13:33:04 1996
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From: [e-mail] (Dan Finn)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.shortwaverec.radio.amateur.misc
Subject: Re: FCC Antenna Doc on WWW
Date: Sun, 18 Aug 1996 01:28:46 GMT
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References: <4u8u23$[e-mail]> <4ubedc$[e-mail]> <[e-mail]> <4ulrpr$[e-mail]> <[e-mail]> <n9jig-1508962030430001@0.0.0.0> <[e-mail]>
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AC6V <[e-mail]> wrote:


>Hi Rich, all 30 pages of the FCC text are to be found at URL:

>http://www.fcc.gov/Bureaus/Cable/Orders/fcc96328.txt

Thanks for the pointer. The regulation looks fairly ironclad to me.
HOA's must allow TV antennas and 1m dishes. I think I will mail a copy
of this to my HOA and get rid of the old cable monopoly I have been
dealing with. At $30.00/mo., a TV antennas with mast and rotor will
pay off very quickly!

>Lets all hope they extend this ruling to the Amateur Radio Service.

The legislation was driven by the type of economics thar we amateurs
cannot muster. Also, with fewer people using cable, there could
actually be more objections to amateur transmissions in these living
quarters built in such close proximity. However, TVI and other
interference concerns cannot be extected to improve when a law is
issued giving free reign to most types of telecommunications. You can
argue for a long time that you use your tribander antenna for TV
reception (perhaps not the best reception) on the same antenna that
you happen to transmit with. That's *if* anyone notices a difference
between a TV antenna and a tribander (say a 10/15/20).
Anyways, it's something to try I guess ;)

>Good Luck with the HOA -- mine is hopeless.

I think after reading the regulation that your >HOA< is out of luck.
You would have to have special circumstances affecting 'safety' (this
would normally apply to tower hieght with respect to the closest
adjacent residence, or possible zoning regulations for wind strength
in some areas) or you would have to be in a historic district.

If your HOA does not believe the new regulation, or cannot undertsand
it, it seems that you do not have to pay any penalties even if they
'fine' you. Like I say, it looks fairly ironclad but then again I am
not a lawyer. I still think anyone having to live with one of these
stupid antenna restrictions would be fairly safe going ahead and
putting up a TV antenna...not much to lose, and a rather clear federal
pre-emption to back you up.

73

KR4AJ



From [e-mail] Wed Aug 21 13:33:07 1996
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From: [e-mail] (Jim Shaffer, Jr.)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.shortwave
Subject: Re: FCC Ruling Will Require Some Hams to File Environmental Impact Reports
Date: Sun, 18 Aug 96 10:52:59
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In article <4uvhre$[e-mail]> [e-mail] (Rob Neff)
writes:
>
> Perhaps the use of an HT helped keep the cancer cells at lower level
> than they would have been without it?

Anything's possible -- ask Beck, Rife, or Lakhovsky.  (OK, Beck -- the rest ar
e
dead.)  But if EM radiation does have non-thermal biological effects, my guess
is that at an arbitrary frequency and power level it would be more likely to
harm than help.

--
 *  From the disk of: | [e-mail]      | "there's a hell of
 Jim Shaffer, Jr.     | IRC: JustnCase             //  | a good universe
 37 Brook Street      | "Real AM radios           //   | next door; let's go"
 Montgomery, PA 17752 |  go up to 30000."      \\//    |     (e.e. cummings)


From [e-mail] Wed Aug 21 13:33:08 1996
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From: Steve Wolf <[e-mail]>
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.shortwave
Subject: Re: FCC Ruling Will Require Some Hams to File Environmental Impact Reports
Date: Mon, 19 Aug 1996 22:34:39 -0400
Organization: The Wolf Family
Lines: 26
Message-ID: <[e-mail]>
References: <4u2uvk$[e-mail]> <4uapth$[e-mail]> <[e-mail]> <4uvhre$[e-mail]> <[e-mail]> <4va49e$[e-mail]>
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>keep emotion out of this ruling. Self-denial that RF cannot cause illness
>will only hurt yourself, but coming on here and stating that to hundreds

Unfortunately, your emotionally charged arguement is all you have to
prove your point that regulation is needed to the level it has been
applied.

It would be much better if we could ignore the people who wanted
to pass laws based on ficticious or emotionally founded fantasies.

Every so often the government does that, goes out on a "jag".  They take
some information that is normally quite emotionally charged and use
it to pass laws that far surpass the need.

A good example was the "fact" that 50,000 children a year are abducted
and we needed new laws to stem this tide.  They passed a bunch of new
laws, citing the dopey figure, without ever considering that it was
a lie.  The laws remain to show how harmful a well-meaning but terribly
misdirected group can do.

--
73,
Steve
        Internet:  [e-mail]
        Amateur Radio:  no8m@no8m.#neoh.oh.usa.na
        MSYS Mail List:  [e-mail] ('info' for title)


From [e-mail] Wed Aug 21 13:33:09 1996
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.shortwave
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From: [e-mail] (Steve Work)
Subject: Re: FCC Ruling Will Require Some Hams to File Environmental Impact Reports
Message-ID: <[e-mail]>
Followup-To: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.shortwave
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Date: Tue, 20 Aug 1996 11:58:42 GMT
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Steve Wolf ([e-mail]) wrote:

: A good example was the "fact" that 50,000 children a year are abducted
: and we needed new laws to stem this tide.  They passed a bunch of new
: laws, citing the dopey figure, without ever considering that it was
: a lie.  The laws remain to show how harmful a well-meaning but terribly
: misdirected group can do.

They neglected to say that, perhaps, in 95 percent of these cases the
children were "abducted" by the child's non-custodial parent.


From [e-mail] Wed Aug 21 13:33:12 1996
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.shortwave
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!imci3!newsfeed.internetmci.com!in3.uu.net!news.imagin.net!news
From: "Brian E. Oakley" <[e-mail]>
Subject: Re: FCC Ruling Will Require Some Hams to File Environmental Impact Reports
Sender: [e-mail]
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Date: Wed, 21 Aug 1996 02:56:25 GMT
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Rob Neff wrote:
>
> [e-mail] (Jeffrey Herman) wrote:
>
> >More like a fantasy. I am *very* sorry to read of your loss; statistics
>
> Fantasy? RF is used all the time in medicine. Tell that to the
> Chiropractor that totaly screws up 10m with his massaging wand. Uses
> RF in the 27-28 MHz band to warm tissue deep inside. Tell that to my
> Dentist who used an 'Radio Scapel' to trim back my gums the other day.
>
> >show 1 in 4 women will suffer from that form of cancer. But let's please
> >keep emotion out of this ruling. Self-denial that RF cannot cause illness
> >will only hurt yourself, but coming on here and stating that to hundreds
> >of thousands of folks is irresponsible.
>
> No self denial. It would be irresponsible to keep quiet and bend over
> for crap like this. They show proof that it harms, and how, then we
> will worry about it. I thought we stopped using 'blood-letting' as a
> treatment a long time ago, what they sugguest is the same thing.
>
> 'We don't know what it is, or if it is at all, but slit their rists
> and let some blood out just in case.'
>
> >Keep your HT at its lowest power setting (not only for health reasons
> >but also to comply with Part 97). Use a speaker mic and hold the HT
> >at arm's length when transmitting (who cares what that will look like -
> >you'll be setting a good example).
>
> Compliance in the face of stupidity is cowardice.
>
> >Be safe,
> >Jeff KH2PZ
>
> Ditto..
>
> Rob Neff (N7ORY)Hey Rob, go talk to W5RWW, he can teach you a little bit. 73
. Brian.


From [e-mail] Wed Aug 21 13:33:13 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!worldlinx.com!clio.trends.ca!winternet.com!mr.net!chi-news.cic.net!news.suba.com!qni.com!gwatts
From: Gary Watts <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: FS Parts & tubes
Date: Sun, 18 Aug 1996 11:05:05 -0500
Organization: Suba Communications
Lines: 23
Message-ID: <[e-mail]>
References: <4v4fhk$[e-mail]>
NNTP-Posting-Host: qni.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
To: [e-mail]
In-Reply-To: <4v4fhk$[e-mail]>


Matthew,
Did you forget how to use the uuencode program
here I fixed up your message text.
would not want you to make it easier on people without uudecoders
no need to thank me I do it as a public service

begin 600 parts.inf
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
end




From [e-mail] Wed Aug 21 13:33:14 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.voicenet.com!netaxs.com!tezcat!cam-news-hub1.bbnplanet.com!howland.erols.net!vixen.cso.uiuc.edu!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!portc01.blue.aol.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (MZak7)
Newsgroups: rec.radio.amateur.homebrew
Subject: FS: Tube tester
Date: 20 Aug 1996 10:13:52 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 1
Sender: [e-mail]
Message-ID: <4vch70$[e-mail]>
Reply-To: [e-mail] (MZak7)
NNTP-Posting-Host: newsbf02.mail.aol.com

Eico mod. 666, exc, works fine, with tube chart, $50+ shipping.


From [e-mail] Wed Aug 21 13:33:15 1996
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From: Woody White <[e-mail]>
Newsgroups: rec.radio.amateur,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: HELP: IS PC SWITCHING POWER SUPPLY OK???
Date: Tue, 20 Aug 1996 01:58:42 -0700
Organization: AT&T WorldNet Services
Lines: 42
Message-ID: <[e-mail]>
References: <4ulu2o$[e-mail]> <4vb581$[e-mail]>
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Bry wrote:
>
> The other bad problem with many of those old switcher power supplies is
> that they generate a lot of RF hash!
Tight shielding, quality bypassing caps (ie: 500pf + .1uf + >10uf, and
ferrite choke in line should kill most noise.

Be sure your power supply includes minimum load resistor.  Some may not.
If not, under light loading the supply could fall out of regulation.
Before hooking to $$ equipment, check voltage at all expected loads.

73, Woody




> [e-mail] (Big Boy) scribbled:
>
> |I have a old crap 8088 'tole box' as you can say!  With the power supply.
> It's
> |rated 7Amp at 12 Volts but i'm wandering if i can use it to supply my mobil
e
> |(used as a base) 13.8V tranceiver unit.  I dont know much of switching powe
r
> |supply technology and i want to know if it's safe.  The problem may be when
 i
> |switch from RX to TX and from TX to RX... could there be a fatal burst of
> |voltage?  Or peraps with a big cap, like 22 000uF, at the exit i can contro
l
> |those peek?
>
> |Unfortunately, i dont have an scope to make charge test.
>
> |E-mail me on that please...
>
> |Thanks and 73 to all readers
>
>
> Brian Carling in Gaithersburg, MD USA

--
de  Woody (WB4QXE) -  [e-mail]
Electron Microscopist/Microanalysist,
Ham radio "homebrewer", shade tree mechanic,
'90 Nissan 240SX, wish still had my Mcycle too!
.


From [e-mail] Wed Aug 21 13:33:18 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsfeeder.servtech.com!news1.io.org!clio.trends.ca!news3.buffnet.net!nntp04.primenet.com!nntp.primenet.com!news.asu.edu!ennfs.eas.asu.edu!cs.utexas.edu!howland.erols.net!news1.erols.com![e-mail]
From: [e-mail] (Bry)
Newsgroups: rec.radio.amateur,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: HELP: IS PC SWITCHING POWER SUPPLY OK???
Date: Mon, 19 Aug 1996 22:43:34 GMT
Organization: Erols - the ISP with USELESS Newsgroup access!
Lines: 37
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The other bad problem with many of those old switcher power supplies is
that they generate a lot of RF hash!

[e-mail] (Big Boy) scribbled:

|I have a old crap 8088 'tole box' as you can say!  With the power supply.
It's
|rated 7Amp at 12 Volts but i'm wandering if i can use it to supply my mobile
|(used as a base) 13.8V tranceiver unit.  I dont know much of switching power
|supply technology and i want to know if it's safe.  The problem may be when i
|switch from RX to TX and from TX to RX... could there be a fatal burst of
|voltage?  Or peraps with a big cap, like 22 000uF, at the exit i can control
|those peek?

|Unfortunately, i dont have an scope to make charge test.

|E-mail me on that please...

|Thanks and 73 to all readers

|---------------------------------------
|"640K will be ok for everyone..."

|Bill Gates '82
|---------------------------------------

|                       The Big Boy


We are having E-MAIL problems with the Internet Server EROLS.
PLEASE cc: all messages to me as follows:
[e-mail]   -   Look at your To: line and make sure it reads properly!!
[e-mail]
Send a copy to BOTH addresses. That way there is a better chance
that I will actually GET your message! Looking forward to hearing from you...
Brian Carling in Gaithersburg, MD USA



From [e-mail] Wed Aug 21 13:33:19 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!tank.news.pipex.net!pipex!oleane!in2p3.fr!univ-lyon1.fr!howland.erols.net!cs.utexas.edu!news.tamu.edu!xenon.brooks.af.mil!usenet
From: Dave Potter <[e-mail]>
Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.antenna,rec.radio.amateur.misc
Subject: Re: how can I broadcast on FM radio?
Date: 16 Aug 1996 20:16:56 GMT
Organization: Brooks AFB
Lines: 11
Message-ID: <4v2kvo$[e-mail]>
References: <[e-mail]> <4u8h1e$[e-mail]> <4uaoqn$[e-mail]> <4uuefd$[e-mail]>
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[e-mail] (Dave Bryndal) wrote:
>
>buy a "Mr. Microphone"

Ur bad, Dave

73s

Dave Potter
KC5UDZ



From [e-mail] Wed Aug 21 13:33:20 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-fw-6.sprintlink.net!mhv.net!news.westnet.com!stevens-tech.edu!newsserver.jvnc.net!newsserver2.jvnc.net!howland.erols.net!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!netnews.worldnet.att.net!ix.netcom.com!news
From: Tim <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How to build 6 meter RC Rig?
Date: Sun, 18 Aug 1996 20:23:24 -0400
Organization: Netcom
Lines: 18
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: pon-mi2-23.ix.netcom.com
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Peter Trapp wrote:

> I have considered building my own 6 meter R/C equipment but haven't been
> able to justify the cost and time required when a commercial 4 channel unit
is
> available for as little as $140 w/rx and tx, nicads, and three servos. BTW t
he
> rx is double conversion. Check out the Futaba Conquest if interested. I can'
t
> come close to duplicating it for the price.
>
> 73,
> Peter, KD4CN

It's never been about price or time with the homebrew bunch.

Check out the IC supply houses, I have seen a TX and RX chipset that provides
all the
encode/decode signals, you just need to add a transmitter and receiver. Sorry
cant
remeber where I've seen them but they were about $7.50 ea.

Regards, Tim


From [e-mail] Wed Aug 21 13:33:21 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-fw-6.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!news.infi.net!newsfeed.direct.ca!op.net!netaxs.com!news.dra.com!news.starnet.net!spool.mu.edu!howland.erols.net!newsfeed.internetmci.com!in3.uu.net!nntp04.primenet.com!nntp.primenet.com!news.asu.edu!ennfs.eas.asu.edu!cs.utexas.edu!geraldo.cc.utexas.edu!slip-60-8.ots.utexas.edu!bsn
From: Barry Newberger <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: J. W. Miller coils
Date: 19 Aug 1996 02:10:15 GMT
Organization: UT-Austin
Lines: 5
Distribution: na
Message-ID: <4v8ie7$[e-mail]>
NNTP-Posting-Host: slip-60-8.ots.utexas.edu
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X-XXMessage-ID: <[e-mail]>
X-XXDate: Sun, 18 Aug 1996 02:10:00 GMT

Can someone recommend a source of J. W. Miller coils and forms
in single lot quantities?

Thanks,
Barry W5KH


From [e-mail] Wed Aug 21 13:33:21 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-ana-24.sprintlink.net!rain.fr!jussieu.fr!math.ohio-state.edu!uwm.edu!news.nap.net!nntp04.primenet.com!nntp.primenet.com!news1.best.com!news.texas.net!news.kei.com!newsfeed.internetmci.com!in2.uu.net!news.prismnet.com!usenet
From: rew5808 <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: knight-kit walkie talkies
Date: Sat, 17 Aug 1996 01:22:47 -0500
Organization: PrismNet - (512)-418-1568
Lines: 8
Message-ID: <[e-mail]>
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can anyone help me find a pair of knight-kit c-1oo walkie talkies from
the early 60's???  they were blue 100mw units.  also looking for a
knight "scan master" 4 band short wave receiver from the same time
period.

thanks
bobby
wb5wur


From [e-mail] Wed Aug 21 13:33:22 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!nntp04.primenet.com!nntp.primenet.com!news.asu.edu!ennfs.eas.asu.edu!cs.utexas.edu!howland.erols.net!newsfeed.internetmci.com!in2.uu.net!nntp.crl.com!usenet
From: Dave Booth <[e-mail]>
Newsgroups: rec.ham-radio,rec.ham-radio.packet,rec.ham-radio.swap,rec.radio,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec
Subject: Re: New Ham Radio Discussion Area on the Web!
Date: Fri, 16 Aug 1996 19:10:24 -0700
Organization: KC6WFS
Lines: 24
Message-ID: <[e-mail]>
References: <01bb88d0$b49bb8e0$[e-mail]>
NNTP-Posting-Host: 165.113.223.131
Mime-Version: 1.0
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To: James Van Houten <[e-mail]>
Xref: news2.epix.net rec.radio.amateur.antenna:23640 rec.radio.amateur.digital.misc:16707 rec.radio.amateur.dx:205 rec.radio.amateur.homebrew:16425 rec.radio.amateur.misc:105963 rec.radio.amateur.policy:35916 rec.radio.amateur.space:7388

James Van Houten wrote:
>
> Hello All,
>
> Will keep it short and to the point.  There is a new resource for Ham radio
> topics.  It is on the web.  Come on over and visit
> http://www.coronetsec.com/hamradio  All hamradio topics welcome.  Hope to
> see you there soon.
>
> Jim
> KA3TTU
>
> ps.  Don't forget to tell all of your non-newsgroup readin' friends!!  :-)
> --
> ----------------------------------------------------------------------------
> ----------
> James Van Houten     http://www.coronetsec.com/hamradio
> ----------------------------------------------------------------------------
> ----------
I'll have to go and check it out!
http://www.geocities.com/Hollywood/5860
--
Dave Booth
kc6wfs dmo4rk


From [e-mail] Wed Aug 21 13:33:23 1996
From: [e-mail] (Jeff Johns)
Newsgroups: rec.radio.amateur.homebrew
Subject: NiCd Fast Charger
Date: Tue, 20 Aug 1996 15:03:30 GMT
X-Newsreader: Forte Free Agent 1.0.82
NNTP-Posting-Host: node12.the-matrix.com
Message-ID: <[e-mail]>
Lines: 10
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsfeed.internetmci.com!in3.uu.net!nntp.crl.com!acara.snsnet.net!news.bham.net!

Does anyone know of a simple circut to be used in conjunction with the
Maxim MAX713 Fast Charger Chip. I've been fortunate enough to get some
of these chips, but don't have any documentation. Any help or feedback
would be greatly appreciated.


Jeff Johns
Email: [e-mail]
Urgent Pager Email: [e-mail]
Amateur Radio: KF4KGQ



From [e-mail] Wed Aug 21 13:33:24 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!news-f.computek.net!news.sprintlink.net!news-fw-6.sprintlink.net!news.clark.net!mr.net!news.sgi.com!swrinde!howland.erols.net!newsxfer2.itd.umich.edu!portc01.blue.aol.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (Hipiket)
Newsgroups: rec.radio.amateur.homebrew
Subject: Question abt Push-pull RF Amplifier plate tank circuits
Date: 16 Aug 1996 17:10:59 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 11
Sender: [e-mail]
Message-ID: <4v2o53$[e-mail]>
Reply-To: [e-mail] (Hipiket)
NNTP-Posting-Host: newsbf02.mail.aol.com

I'm planning to build an RF amplifier using two tubes in push-pull and I
have a question about the tank circuit.
I've noticed that every design I have seen from the 1930's to the 60's
ARRL handbook has an RF choke at the center-tap of the tank coil, where
the B+ is applied to the circuit.
Why is this?  When one tube is in conduction and that end of the plate
coil is approaching zero, the other end will be near two times B+, but the
center tap should always be at B+ but have no RF at that point.
Why can't I just use a feedthrough capacitor and a short lead to the coil
center-tap and dispense with the RFC?
Thanks for any ideas...de AC4AQ  (Jeff).


From [e-mail] Wed Aug 21 13:33:26 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.fibr.net!nntp04.primenet.com!nntp.primenet.com!news.asu.edu!ennfs.eas.asu.edu!cs.utexas.edu!swrinde!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!portc01.blue.aol.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Question abt Push-pull RF Amplifier plate tank circuits
Date: 20 Aug 1996 00:58:53 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 41
Sender: [e-mail]
Message-ID: <4vbgmd$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <[e-mail]>, "William E. Sabin"
<[e-mail]> writes:

>
>Let's see if I can guess. The RF choke has enough energy stored in its
>inductance that it acts as a constant-current source for the RF plate
>current pulses. The two tubes switch this current pulse back and forth,
>in the process energizing the flywheel tank. The DC supply re-supplies
>this energy to the choke. This works only for a balanced push-pull
>circuit. A single-ended circuit needs a ground reference point (a bypass
>capacitor).
>
>Bill W0IYH

That could be true Bill.

If the choke were the sole component involved, the choke would store and
release a lot of energy to the tank. It would have to be a very good choke
or it quickly would become a very hot or perhaps an arcing choke.

It's hard to guess why a circuit that should not work very well actually
does. I can think of at least three things that help.... stray
capacitances from the center of the tank to ground, the choke being less
than infinite impedance, the tubes stray capacitance to ground (that's a
biggie).

The output capacitance of the tubes forms a center tapped capacitance in
parallel with the tank that is grounded at the center! If the tubes have
fairly low capacitive reactance compared to the tank capacitor values,
that's enough right there.

By the way, this is a second valid reason to float the coil and ground the
variable capacitor junction...but one that mainly applies at higher
frequencies. The original question refered to HF tanks.

At VHF, tube output capacitance forms a center tapped capacitance across
the tank, grounded at the center. If the builder uses a tank coil RF
grounded at the center at VHF, he is really asking for multiple resonance
problems.

73 Tom


From [e-mail] Wed Aug 21 13:33:27 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!portc01.blue.aol.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Question abt Push-pull RF Amplifier plate tank circuits
Date: 20 Aug 1996 11:05:39 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 39
Sender: [e-mail]
Message-ID: <4vck83$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <[e-mail]>, "Ian White, G3SEK"
<[e-mail]> writes:

>Also note that everything that's been said about the plate circuit
>applies even more to the grid. In addition to all the other problems,
>unbalance in the grid tuned circuit will deliver unequal drive to the
>two tubes.

Unequal load at the anodes causes a similar problem. One valve (I mean
tube) is undercoupled and one is overcoupled by tank unbalance.

>> In push-pull grid circuits there are advantages in floating
>both the variable capacitor and the inductor, and grounding the circuit
>through a preset differential capacitor to balance out all the strays
>(two separate preset trimmers can be used instead).
>

Not always, and certainly not unless the circuit's shunt C is a very low
reactance compared to the grid impedance.  :-) It's a problem of
impedances, and general "do it like this's" can get us in deep trouble.

For an example, look at the grid circuit of a push pull class amplifier
that draws grid current. It has widely varying impedances at the grids
that gets pretty low, and very high capacitive reactance at each outer end
to keep things equal (unless the tube is *very* large). In class C (or
AB2) grid circuit, we want the coil center to be used as the drive
reference. Mutual coupling helps solve the problem, giving each grid a
stiff source.

The designer had best look at the actual application closely to decide
what method is best...especially at VHF. At a low enough frequency, we can
throw out some general rules and the system will work.

The original question was HF. In that general case with small tubes (like
20 kW on down), a center tap reference at the grid inductor and a center
tap reference at the grounded rotor on the output tank variable would
almost always be best.

73 Tom


From [e-mail] Wed Aug 21 13:33:28 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!alpha.sky.net!news.abest.com!news.internetMCI.com!newsfeed.internetmci.com!ncar!csn!nntp-xfer-1.csn.net!magnus.acs.ohio-state.edu!math.ohio-state.edu!cs.utexas.edu!howland.erols.net!nntp04.primenet.com!nntp.primenet.com!newsfeed1.aimnet.com!ns1.aplatform.com!ns2.mainstreet.net!sloth.swcp.com!news.lascruces.com!usenet
From: [e-mail] (Mark Mandelkern)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Question abt Push-pull RF Amplifier plate tank circuits
Date: Wed, 21 Aug 1996 04:29:47 GMT
Organization: Internet de Las Cruces
Lines: 41
Message-ID: <4ve3cq$[e-mail]>
References: <4v2o53$[e-mail]> <4v2uq3$[e-mail]> <4v7m2v$[e-mail]> <[e-mail]> <[e-mail]> <4v89h2$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: du3-ts1.lascruces.com
Summary: ▒
X-Newsreader: Forte Free Agent 1.0.82

I think it's clear that one should not r.f ground BOTH the
coil and the tuning condenser. But the question still is,
Why r.f. ground either?

My guess is that for older, smaller, lower-power,
lower-voltage amplifiers, it was very convenient to ground
the rotor of the condenser. So the RFC on the coil was
needed. But at the KW level it not so much of an extra chore
to mount the condenser on ceramic insulators and to use a
ceramic shaft insulator (and a grounding panel bearing for
safety).

One advantage of not r.f grounding the condenser is that
only the r.f. voltage, not d.c. plus r.f., will appear
across the plates. Also, there is less chance of a VHF
parasitic circuit set up via the condenser through ground.

The advantage of the RFC on the coil is that there is less
chance of any significant r.f. currents through the bypass
condenser. The simple feed-thru capacitor suggested earlier
would be questionable in regard to voltage rating (incl.
r.f. voltage) and r.f. current.

So it seems neither need be grounded, and all the mentioned
advantages obtained.

Repeating my earlier comment,

>In my homebrew push-pull 4-400A, 50 mc. amp, neither is at r.f. ground.
>No connection at the rotor. RFC, 6 uH, at the coil. Working fine for
>35 years!


73,

Mark, K5AM         DM62

Mark Mandelkern
Las Cruces, New Mexico, USA
[e-mail]



From [e-mail] Wed Aug 21 13:33:29 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-ana-24.sprintlink.net!news.sprintlink.net!news-stk-3.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!news.infi.net!newsfeed.direct.ca!news.emf.net!newsfeed.internetmci.com!in3.uu.net!news.usa.net!earth!dryan
From: [e-mail] (David Ryan)
Newsgroups: rec.radio.amateur.homebrew
Subject: Radio w/ TV UHF
Date: 19 Aug 1996 13:10:26 GMT
Organization: Internet Express (800-592-1240 customer service)
Lines: 11
Message-ID: <4v9p42$[e-mail]>
NNTP-Posting-Host: earth.usa.net
X-Newsreader: TIN [version 1.2 PL2]

I'm looking for a portable radio that includes the ability to receive the
audio part of television broadcasts from the UHF band.  I've founds lots
that work with the VHF but none of the UHF.  I used to own one years ago.

Where should I look to find this thing.

I don't usually read this group so email responses would be welcome.

Thanks,

David Ryan


From [e-mail] Wed Aug 21 13:33:29 1996
Path: news2.epix.net!news
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: transmitter/ receiver..
Date: Mon, 19 Aug 1996 20:37:34 GMT
Organization: epix.net
Lines: 16
Message-ID: <4vaf18$[e-mail]>
NNTP-Posting-Host: grmn-105ppp57.epix.net
X-Newsreader: Forte Free Agent 1.0.82

not sure if this is the right, group, but here goes.
I'm looking for schematics for a little reciver/ transmitter combo for
use in my  and my partner's motorcycle helmets as her voive is too
petite to be heard at speed. PTT not necessary, crystal controlled is
fine- im new to radio, so I'm looking for something that wont take
much if any tweaking/calibration. Prefer images rather than ascii as I
can NEVER figure out the ascii drawings...:) any picture format is
fine..
im looking for a battery powered setup that transmits maybe 300 feet
tops.( for when i give the second kit to a car driver)
email pls..
[e-mail]
TIA





From [e-mail] Wed Aug 21 13:33:30 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.cdsnet.net!news.magicnet.net!news.sprintlink.net!news-fw-6.sprintlink.net!news.nkn.net!tejas
From: [e-mail] (Herb Blair)
Newsgroups: rec.radio.amateur.homebrew
Subject: Updated WWW DX Notebook
Date: Thu, 15 Aug 96 23:42:14 GMT
Organization: National Knowledge Network
Lines: 9
Message-ID: <4v317n$[e-mail]>
NNTP-Posting-Host: app64.applink.net
X-Newsreader: News Xpress 2.0 Beta #0

WA5YKO's DX Notebook has been update with some great new links.
Check it out!

http://www.applink.net/tejas


73 es gud dx
de WA5YKO



From [e-mail] Wed Aug 21 13:33:31 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.inet.com!news.sprintlink.net!news-dc-10.sprintlink.net!laslo.netnet.net!en.com!in-news.erinet.com!ddsw1!news.mcs.net!nntp04.primenet.com!news.shkoo.com!nntp.primenet.com!news.cais.net!news.hkt.net!news.asiaonline.net!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Wanna to win A CD player ?
Date: Thu, 15 Aug 1996 20:31:12 GMT
Organization: Asia On-Line Limited, Hong Kong.
Lines: 4
Message-ID: <4uucj2$[e-mail]>
NNTP-Posting-Host: 202.85.10.17
X-Newsreader: Forte Free Agent 1.0.82

Wanna to win A CD player ?
If you are interesting in a Philippines Radio Show, try :
http://www.corjam.com/



From [e-mail] Wed Aug 21 13:33:32 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-dc-5.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!news.infi.net!solaris.cc.vt.edu!newsfeed.internetmci.com!usenet.eel.ufl.edu!psgrain!rainrgnews0!hevanet.com!usenet
From: "miker in Tigard, OR." <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment
Subject: Wanted Schematic for MFJ207 SWR Analyzer
Date: Tue, 20 Aug 1996 00:05:16 -0700
Organization: Hevanet Communications
Lines: 3
Message-ID: <[e-mail]>
NNTP-Posting-Host: st-ppp04.hevanet.com
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X-Mailer: Mozilla 2.02 (Win95; I)
Xref: news2.epix.net rec.radio.amateur.homebrew:16447 rec.radio.amateur.equipment:31752

Has anyone tried to add higher frequency ranges to the MFJ207?
Need schematic.
thanks, miker


From [e-mail] Wed Aug 21 13:33:33 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!EU.net!usenet2.news.uk.psi.net!uknet!usenet1.news.uk.psi.net!uknet!psinntp!psinntp!psinntp!main03!landisj
From: [e-mail] (Joe Landis)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: where to find ultrasonic sensor
Message-ID: <1996Aug20.193222.617@main03>
Date: 20 Aug 96 19:32:22 EST
References: <01bb8598.fe59c5c0$fb99389d@DISCUS> <[e-mail]>
Distribution: world
Organization: North American Drager - Telford, PA
Lines: 27

Tom, your original post has expired on my server so I don't know your reply
address. I found a brand new Murata/Eire ultrasonic mic element in my junk box
.
You can have it for the cost of shipping, probably just a few bucks.
Let me know. Oh, and I have the spec sheet.

Model: MA40-A3R
Nominal freq: 40khz
Bandwidth: 4khz min at -73db
Capacitance: 1300pf

Joe - AA3GN

> Tom Kreyche wrote:
>>
>> I'm planning to build a detector for bats (the flying mammals!) probably
>> for dumping into a laptop for some kind of spectral analysis. Anyone have
>> recommendations for ultrasonic sensors? Different bat species use
>> different frequencies, typically 40 kHz to 60 kHz, audio.
>>
>> BTW, I've seen some standalone commercial detectors for about $250 but
>> it's no fun just buying one!
>>
>> Thanks, Tom KG6YJ
>
--
[e-mail] - speaking only for myself, of course
No, this is not a sig.


From [e-mail] Wed Aug 21 13:33:34 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsfeed.internetmci.com!uwm.edu!news.moneng.mei.com!news.ecn.bgu.edu!vixen.cso.uiuc.edu!news.stealth.net!demos!news.uni-stuttgart.de!moritz
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Wiring of TX/RX relay in transverter?
Date: 20 Aug 1996 11:10:50 GMT
Organization: Comp.Center (RUS), U of Stuttgart, FRG
Lines: 10
Message-ID: <4vc6fq$[e-mail]>
NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de

Hi All,

I am wondering which may be the best way to wire the TX/RX relay
in a SHF transverter. I could wire the RX input to the NC contact,
thus saving current on receive or I could wire the TX output to the
NC contact and the RX to the NO contact, thus protecting the output
transistors in case the relay fails to close.

Any preferences? Moritz DL5UH



From [e-mail] Wed Aug 21 13:33:35 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-chi-8.sprintlink.net!demos!news.uni-stuttgart.de!uni-erlangen.de!lrz-muenchen.de!informatik.tu-muenchen.de!fu-berlin.de!main.Germany.EU.net!EU.net!Austria.EU.net!news.ping.at!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew,uk.radio.amateur
Subject: YAESU FT-1000D: need mod,see file - yaft1000.txt - yaft1000.txt (1/1)
Date: Wed, 21 Aug 1996 11:02:23 GMT
Organization: ping - Personal InterNet Gate
Lines: 14
Message-ID: <4veq9g$[e-mail]>
NNTP-Posting-Host: dynamic-044.ts2.vienna.at.ping.net
X-Newsreader: Forte Free Agent 1.0.82
Xref: news2.epix.net rec.radio.amateur.homebrew:16456 uk.radio.amateur:15273

begin 644 yaft1000.txt
M#0I$96%R(%-I<G,-"@T*22!H879E(&$@64%%4U4@1E0M,3`P,$0@86YD(&YO
M=R!)(&AA=F4@<V]M92!Q=65S=&EO;BX-"@T*2&%V92!Y;W4@86YY(&ED96$@
M;W(@:7,@=&AE<F4@82!M;V1I9FEK871I;VX@=&\@<F5C96EV92!B96QO=R`Q
M,#`@:TAZ(#\-"DD@:&%V92!P=70@=&AE(%))1R!I;B!T:&4@1T5.+4UO9&4@
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M9B!Y;W4@8V%N(&AE;'`@;64L('!L96%S92!W<FET92!B86-K("$-"@T*12U-
686EL.B`S-69D,#`Q0'!I;F<N870-"@``
`
end


From [e-mail] Tue Aug 27 16:23:28 1996
Path: news2.epix.net!news
From: "Brian D. McKinley, Ph.D." <[e-mail]>
Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner
Subject: Re: $$Money4U$$
Date: Mon, 26 Aug 1996 13:36:57 -0700
Organization: epix.net
Lines: 56
Message-ID: <[e-mail]>
References: <4vjuut$[e-mail]>
NNTP-Posting-Host: svcr-84ppp73.epix.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.02E-KIT  (Win16; U)
To: MoneyMan <[e-mail]>
CC: [e-mail], [e-mail]
Xref: news2.epix.net rec.radio.amateur.digital.misc:16770 rec.radio.amateur.homebrew:16520 rec.radio.amateur.misc:106141 rec.radio.scanner:55533

Dear Sir,

In reply to your recent post to a Amateur Radio News group.  A couple of
notes:

1.  Pyramid games are quite illegal.  Always have been, always will be.
You should be investigated.  Your internet privlidges should be
permanently revoked, and you buns should rot in jail for the next 8-15
years.

THE INTERNET is not some new vehicle for tired old cons.  We wjo use the
internet and don't want to see it regulated worry about "holes" like you.


2.  No one who reads these groups accept those named "illegal activities"
care about your con and wish you would stop wasting space.  If you were
proud of what you were doing, your NAME would appear in the header
instead of some insane name like "MoneyMan"

3.  Scum like you are the lowest form of predator in the world, you and
all the pedophiles of the world should be the victims of WW III.

Sincerely,

Brian D. McKinley, Ph.D.
56 Church Street
Kingston, PA 18704

[e-mail]

MoneyMan wrote:
>
> NO - NOT AT A CASINO - RIGHT HERE ON THE INTERNET!
>
> Taking 5 minutes to read this text may be one of the best decisions you
> ever made.
>
> My name is not important. What is important is what happened to me.


Deleted out of fairness to the readers


> STEP 1. Write your name and address on 5 separate pieces of paper with
> the words "PLEASE ADD ME TO YOUR MAILING LIST". Fold a $1 note or money
> order or bank draft in each of the pieces of paper and mail them to the
> following five addresses:

MORE DRIBBLE

> You are now in the Mail Order Investment Business and you will start
> receiving $1 returns by mail within a week or two. The more news groups
> you post to, the bigger your return will be. You may want to rent a
> Post Office Box to handle the volume of mail you are likely to receive.

So the authorities can't find you????


From [e-mail] Tue Aug 27 16:23:28 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!newsfeed.internetmci.com!news.bctel.net!news.smartt.com!usenet
From: [e-mail] (me)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: (none)
Date: Fri, 23 Aug 1996 10:48:47 GMT
Organization: toast-mcxw32.smart.net
Lines: 5
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: burn-mx0100202.smartt.com
X-Newsreader: Forte Agent .99c/16.141

On 22 Aug 96 19:01:18 GMT, [e-mail] (Dennis Edinger)
wrote:

>unsubscribe [e-mail]  [e-mail]
Hee Hee!


From [e-mail] Tue Aug 27 16:23:29 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!nebo.vii.com!xmission!news
From: [e-mail] (Greg)
Newsgroups: rec.antiques.radio+phono,rec.radio.swap,rec.ham-radio.swap,rec.radio.amateur.homebrew
Subject: *** SOLD**** Heathkit Power Supply HP 23 B
Date: 24 Aug 1996 03:39:45 GMT
Organization: Your Organization
Lines: 5
Message-ID: <4vlti1$[e-mail]>
NNTP-Posting-Host: pm46.cwo.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.7
Xref: news2.epix.net rec.antiques.radio+phono:21562 rec.radio.swap:71755 rec.radio.amateur.homebrew:16503

Thanks to all of you who responded.  To be fair I chose the first
response to my posting.
Greg
73's KB6WKW



From [e-mail] Tue Aug 27 16:23:30 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!spool.mu.edu!agate!dog.ee.lbl.gov!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re:  10mW to 250mW ATV Amp Needed
Date: 22 Aug 96 16:43:19 GMT
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For that kind of gain/power, there are several good devices.  One
that I would suggest would be either the MRF

the MRF557 or the MRF559.  Both of these devices work very well at 70cm
and have good gain, and should easily handle the power.  One of these
two devices (the '557 I *think* - my Motorola book isn't handy at the
moment...) can actually handle a watt or so.  Of course, one needs
to bias it properly and wrap some simple tuned circuits around it (just
some appropriate bits of wire and a bunch of ceramic trimmers - adjust until
it works well...) but that's pretty easy.  The 13+db of gain you want may
be a bit much for just one stage, but something like a MAV11 MMIC could
cleanly take it up to 20-40mW cleanly (assuming that you attenuate the 10mW
drive a bit...)  Another device that may work is the BFR96.  2
 250mW is pushing a BFR96 a bit hard, but that that frequency it should do
OK, assuming that it is heat-sinked reasonably well.  The nice thing about
a BFR96 is that they are cheap and likely to be easily available.

<Clint>


From [e-mail] Tue Aug 27 16:23:31 1996
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From: [e-mail] (Bob Zito)
Newsgroups: rec.radio.amateur.homebrew
Subject: 23 cm vertical polarization homebrewing?
Date: Thu, 22 Aug 1996 21:20:47 GMT
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23 cm vertical polarization homebrewing? Has anyboby made and used
(with success) a 23 cm gain antenna (~>=13.0db gain) be it vertical,
yagi or whatever? Am I the only one on this band? Hello???
Thanks!
Bob

<[e-mail]> (Bob Zito) KI7EV WA. State


From [e-mail] Tue Aug 27 16:23:32 1996
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From: Bob Winingham <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 23 cm vertical polarization homebrewing?
Date: 25 Aug 1996 10:03:30 GMT
Organization: OnRamp Technologies; ISP;  Dallas/Ft Worth/Houston, TX USA
Lines: 7
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I have seen lots of 23 Cm loop yagi just rotate 90 deg.

73
Bob Dallas





From [e-mail] Tue Aug 27 16:23:33 1996
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From: [e-mail] (ZIPPY)
Newsgroups: rec.radio.amateur.homebrew
Subject: 2M CW or SSB XCVR Kit
Message-ID: <[e-mail]>
Date: Tue, 20 Aug 96 22:56:00 -0500
Distribution: world
Organization: Media Spectrum:  Montreal, Quebec - [phone]
Reply-To: [e-mail] (ZIPPY)
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Yes, Curtis, there is.  It's a Ten-tech model.  I'm not sure the model
#.  Try Ramsey products.  Also:  Look @ CQ, QST, 73 magazines.


From [e-mail] Tue Aug 27 16:23:34 1996
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From: Gary D Schlickelman <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: 4-400 & 4-125 TUBES for sale
Date: Sun, 25 Aug 1996 00:19:31 GMT
Organization: Netcom
Lines: 1
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Have one pr each 4-400/8438 and 4-125a/4D21 types. Will sell for best offer.


From [e-mail] Tue Aug 27 16:23:35 1996
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From: [e-mail] (William L. Fuqua III)
Newsgroups: rec.radio.amateur.homebrew
Subject: 4CX250B as GG TRIODE amp ???
Date: 27 Aug 96 12:26:54 GMT
Organization: ucsd usenet gateway
Lines: 30
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
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At 10:24 PM 8/26/96 PDT, you wrote:

>From: [e-mail] (Chris Scott)
>Subject: 4CX250B as GG TRIODE amp ???
>
>Q. Can 4CX250Bs be operated grounded grid as a triode for HF ?
>
>I've seen sweep tube amps (tetrodes) with both grids tied, operated
>as grounded grid triodes, for stability and to get by without a
>regulated screen supply.
>
  I have  seen this done but if you do it by just connecting the
grid-1 and grid-2 to ground you will vaporize the control grid.
You can connect the control grid to the cathode and ground the
screen grid. But the output power will be low.
  I knew a guy that tried to use series resistors on the control
grid and also tried to tap the control grid down the cathode choke
to reduce the drive to it but neither worked very well.
  Eimac recommends not to use triode configuration for the 4cx series
or the 4-65.

  73
  Bill wa4lav

  William L. Fuqua III  P.E.  E-mail [e-mail]  Phone [phone]
5
  Department of Physics and Astronomy      CP-177 Chem. Phys. Bldg.
  University of Kentucky ,                 Lexington, Ky 40506-0055





From [e-mail] Tue Aug 27 16:23:36 1996
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From: [e-mail] (ZIPPY)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: amateur database
Message-ID: <[e-mail]>
Date: Tue, 20 Aug 96 23:03:00 -0500
Distribution: world
Organization: Media Spectrum:  Montreal, Quebec - [phone]
Reply-To: [e-mail] (ZIPPY)
References: <4v8bg6$[e-mail]>
X-Newsreader: PCBoard Version 15.22
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Hello, my name is Andrew Foot.  I live in Canade, provinceof Quebec, and
my call sign is:  VE2DNN.  My son's email adress is [e-mail]
I can be reached indirectly at this address, and would like to be
included on your world-wide list.

Andrew via Zippy


From [e-mail] Tue Aug 27 16:23:37 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news3.epix.net!uunet!in2.uu.net!news.fyi.net!news
From: Robert Morris <[e-mail]>
Subject: Re: AMATEUR INTERNET ADDRESS DATABASE
X-Nntp-Posting-Host: dyn3.fyi.net
Content-Type: text/plain; charset=us-ascii
To: MIKE <[e-mail]>
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Sender: [e-mail] (News User)
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MIKE wrote:
>
> WE HAVE IN THE WORK'S A COMPILATION OF AMATEUR RADIO OPERATORS
> INTERNET ADDRESSES,, IN ORDER TO CREATE A PUBLICLY ACCESSABLE
> WORLD-WIDE WEB SITE/SERVER/DATABASE.
>
> THE FORMAT OF THE DATABASE WILL SIMPLY INVOLVE THE INPUT OF THE TARGET
> OPERATORS CALL-SIGN,, WHICH WILL YIELD THAT HAM OPERATORS
> INTERNET/E-MAIL ADDRESS,, THERE IS AT THIS TIME NO OTHER SERVICE LIKE
> IT,, THAT WE ARE AWARE OF,, AND WHICH WE THINK WILL BE VERY USEFUL AND
> ORIGINAL.
>
>              HOWEVER,, IN ORDER TO COMPILE THIS VAST AMOUNT OF DATA WE
> NEED THE HELP OF OUR FELLOW AMATEUR'S,, PLEASE LET ANY FELLOW HAMS WITH
> ACCESS TO THE INTERNET KNOW OF THIS "PROJECT IN PROGRESS"!!!!"
>
> ALL WE NEED ARE THREE PIECES OF INFO FROM EACH OPERATOR (AS FOLLOWS)
>
> 1-- NAME                      --  WE APPRECIATE YOUR EFFORT'S IN GATH-
> 2-- CALL SIGN                 --  ERING AS MANY AS POSSIBLE!!
> 3-- INTERNET/E-MAIL ADDRESS   --
>
>           SEND ALL ENTRIES TO-----  [e-mail]
>
>             thank you all,,,,73's,,,,,mike-- n2ucm.

The QRZ Callbook Web is doing this... Look up your call and
a form comes up to take your E-mail adr.....

Bob...K2RK


From [e-mail] Tue Aug 27 16:23:38 1996
Newsgroups: rec.radio.amateur.homebrew
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From: Tovar <[e-mail]>
Subject: Re: Are vapors from solder harmful?
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Gary Coffman wrote:
> The big lead danger is that some will rub off on your fingers while
> you are handling the solder. This can then be ingested if you eat,
> drink, smoke, or otherwise touch body openings without washing your
> hands carefully first. Don't rub your eyes either. Obviously, don't
> pull the old stunt of holding the solder in your mouth while you work.

Even as a pre-teen, it was obvious to me that this would be a very bad
idea.  If i needed that kind of 'third hand', i had solder in a plastic
tube which avoided direct contact.  30+ years later, i've looked around
for the same thing, but so far, everyone prints on the *outside* of the
tube, and i would rather find something else to hold the parts than to
ingest even minute quantities of some unknown ink.

                        -- KD6PAG  (who'd be quarter century if it
                                    weren't for the code.)


From [e-mail] Tue Aug 27 16:23:39 1996
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From: David Kao <dtkao>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Are vapors from solder harmfull?
Date: 23 Aug 1996 01:26:37 GMT
Organization: Information Networks Division: Hewlett Packard
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I would rather believe that it's hramful. There were poisoning reports from
an electroinc assembly line in a factory in Taiwan 20 or maybe 30 years ago.
Many assembly line workers got poisoned after working in the plant for about
a year. After careful study of the case it was determined that the solder
vapor was the cause of the poisoning.

Most of the workers were young women. A few workers died and some had brain
damage and could never recover. Most workers had damaged liver. The factory
was shutdown and went bankrupt forever later. Now if you look around labs and
factory assembly lines you will see very effective ventilation system in
place to secure worker's safety.

Hope this convinces you that solder vapor is actually extremely dangerous.



From [e-mail] Tue Aug 27 16:23:40 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!newspump.sol.net!chi-news.cic.net!news.suba.com!qni.com!gwatts
From: Gary Watts <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Are vapors from solder harmfull?
Date: Wed, 21 Aug 1996 10:07:00 -0500
Organization: Suba Communications
Lines: 67
Message-ID: <[e-mail]>
References: <[e-mail]> <4uh23c$[e-mail]> <[e-mail]>
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Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
To: Gary Coffman <[e-mail]>
In-Reply-To: <[e-mail]>

Gee Gary,
Good point but now I have a idea.
Lets SUE  mfg's and distributors of our lead based solder.
They should had know for years that the stuff was dangerious
if not held in the prescribed manner. I dont think that they had warning
labels on the packages  :-)

Bottom line Gary...
Keep up the GREAT posts and responses
I find your text both entertaining anf very informative !

73
Gary Watts  de  N0OXV
Kansas City Mo
81 GL1100I


On Sat, 17 Aug 1996, Gary Coffman wrote:

> In article <4uh23c$[e-mail]> [e-mail] (W8JI  Tom) wr
ites:
> >I've held solder in my mouth all my
> >life, and I'm perfectly normal. As a matter of fact, I've NEVER met a
> >crazy Ham. Think about it.
>
> Ah, this explains a lot. :-)
>
> Actually, the effect of lead poisoning is not insanity (that's the
> result of mercury poisoning, IE Mad Hatter syndrome). The mental
> effect of lead poisoning is a marked lowering of IQ. This is well
> documented, and the microgram per liter concentrations required to
> have a measurable effect are tiny, less than 5 ug/l. That's why all
> the concern about leaded gasoline and leaded paint and lead bearing
> solder in water piping.
>
> Putting solder in your mouth is dumb, and makes you dumber.
>
> Gary
> --
> Gary Coffman KE4ZV          |    You make it,     | Due to provider problems

> Destructive Testing Systems |    we break it.     | with previous uucp addre
sses
> 534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
> Lawrenceville, GA 30244     |                     |
>
>
.



















.




From [e-mail] Tue Aug 27 16:23:42 1996
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From: Jay Craswell <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Are vapors from solder harmfull?
Date: 20 Aug 1996 21:07:02 GMT
Organization: Dover Research Corp.
Lines: 4
Message-ID: <4vd9dm$ld2$[e-mail]>

I had a pal who used to chew solder...  Course he never finished High School.
Which in the US is REALLY bad!
--
73, Jay WB0VNE - AAV5TH


From [e-mail] Tue Aug 27 16:23:43 1996
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From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Are vapors from solder harmfull?
Date: Sat, 24 Aug 96 03:19:42 GMT
Organization: Not Enough
Lines: 24
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Message-ID: <4vlskb$[e-mail]>
References: <4u83g4$[e-mail]> <[e-mail]> <[e-mail]> <4vj1cd$[e-mail]>
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X-Newsreader: News Xpress Version 1.0 Beta #4

       David Kao <dtkao> wrote:

>I would rather believe that it's hramful. There were poisoning
>reports from an electroinc assembly line in a factory in Taiwan
>20 or maybe 30 years ago.

    <snip>

>A few workers died and some had brain damage and could never
>recover. Most workers had damaged liver.

I'd sure like to know what was in that solder!  Thousands,
perhaps tens of thousands of U.S. technicians have worked in
similar environments for many years, with not so much as an
upset stomach.

>Hope this convinces you that solder vapor is actually
>extremely dangerous.

Sorry, no.  Whatever the health hazards of solder vapor, the
dangers seem anything but extreme.

73,
Jack  WB3U


From [e-mail] Tue Aug 27 16:23:44 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!news.mindspring.com!cssun.mathcs.emory.edu!metro.atlanta.com!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Charging Help for 1.2 AH Sealed Lead-Acid Battery
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4v5pq4$[e-mail]>
Date: Thu, 22 Aug 1996 15:56:32 GMT
Lines: 69

In article <4v5pq4$[e-mail]> [e-mail] (Mark Schoonover <KA6WK
E>) writes:
>       I purchase a small 1.2 AH lead acid battery, and would like
>to ask for help in how to charge the thing. The sales guy where I
>purchased it from said to charge at a current of 10% of the rated amp-hour
>rating. OK, if that's true, then I need to charge at 120 mA. I would like
>to be able to charge from a 20 amp, 13.8v regulated supply and my car.
>I'v calculated the limiting resistor to be 12 ohms, using ohm's law.
>When I figure in the power dissapation for the resistor, it works out
>to be over 12 watts! Is this true??? Or would it all be easier to
>get a low current, 12 volt wall wart and forget charging in the car?
>I'm sure I've missed something, qould someone point me to the
>right direction?

Ok, you have a 13.8 volt source, the battery has charged to a terminal
voltage of 13.6 volts, how much current flows through your 12 ohm
resistor?

Answer, 16 mA, and power dissipation is 3.2 mW. What's wrong with this
picture?

You can't get a constant current charge to a battery whose terminal
voltage rises as it is charged using just a simple resistor. And you can
never get a battery with a 13.8 volt terminal voltage at full charge
*to* full charge if you only use a 13.8 volt source. As charging time
tends toward infinity, battery terminal voltage tends toward 13.8 volts,
charging current tends toward zero, and *at* infinite time you'd reach
full charge *except* you haven't accounted for internal battery losses.
In other words, you can't get there from here.

You need a charging source voltage of around 14.2-14.5 volts to
fully charge a 13.8 volt lead acid battery. Fortunately, lead acid
batteries *don't* require a constant current charger (NiCads do).
Lead acid batteries are charged with a *constant voltage* charger.

A fully depleted lead acid battery will *self-limit* the current
it will accept, and doesn't require a current limiter circuit in
the charger. However, you should *never* allow a lead acid battery
to become fully depleted. That will cause the plates to sulfate and
drastically shorten the battery's life. You must quit discharging
a "12 volt" lead acid battery when the terminal voltage reaches
10.2 volts. At that point, 80% of the battery's capacity is
exhausted.

A lead acid battery in that state *can* accept too rapid a charge,
so charging needs to be limited to a safe value. An electronic
current limiter can be used, or a saturable reactor can be used
(a wall wart can sometimes serve as a saturable reactor). But a
simple resistor can be used too at the cost of a long taper to
final charge.

Lets assume you have a 14.5 volt source, the battery is at 10.2
volts, and you want to limit current to 1.4 A. A 3.7 ohm series
resistor with a power rating of 10 watts will handle this chore.
As the terminal voltage of the battery rises, charge current will
quickly taper to a much lower value (dropping to 216 mA at final
taper). When battery terminal voltage reaches 13.8 volts, it will
be fully charged. This should take about 4 hours.

Remember, a watched battery never boils. Don't go off and leave
the battery unattended for a long period while charging. Or if
you must, have a voltage monitor which will shut off the charger
when the battery terminal voltage reaches 13.8 volts.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | Due to provider problems
Destructive Testing Systems |    we break it.     | with previous uucp address
es
534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Tue Aug 27 16:23:45 1996
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From: Jim Conn <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Commercial CW use
Date: Fri, 23 Aug 1996 09:10:03 -0700
Organization: GTE
Lines: 68
Message-ID: <[e-mail]>
References: <[e-mail]> <4uniqt$[e-mail]> <[e-mail]> <4v021c$[e-mail]> <[e-mail]> <4vgea5$[e-mail]> <[e-mail]> <4viv8o$[e-mail]>
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[e-mail] wrote:
>
> In <[e-mail]>, Jim Conn <[e-mail]> writes:
> >I don't get it.  The HF bands are not useful for high speed digital work.
> >
> Rediculous ... all it takes is the right modulation and coding
> techniques and a progressive regulatory structure that permits it.
> Obviously higher data rate wider bandwidth transmissions are more easily
> accomodated at higher frequencies, but HF will support FAR beyond 300
> baud FSK packet.
> The cost/bandwidth/performance of HF high speed digital services
render such a thing impractical within the confines of the amateur bands.

> >If we remove the requirment to learn CW in order to be a radio amateur
> >operator on HF, we effectively deny future generations of amateurs the
> >opportunity to communicate with foreign hams who cannot afford the
> >elaborate rigs that americans take for granted, and can only
> >communicate with inexpensive, easily constructed CW HF rigs.
> >
> Again, I must disagree ... I've traveled quite a bit ... even in poor
> countries in latin America, the hams have rigs comparable to ours,
> complete with DSPs, etc.  And you should see the antenna farms!
> (From my experience, foreign hams tend to be quite well-off financially
> for their own society ... much more so than American hams.)

If you don't use CW, then probably you wouldn't have QSOs with the
multitudes of foreign hams who use only CW, and have home made
equipment.

>
> >SSB is just as outmoded as a means of communication as FM and CW, if you
> >only consider the amount of data you are able to pass in the shortest
> >period of time.
> >
> Actually SSB is probably still by quite a margin the MOST efficient
> means of conveying voice information in terms of required RF bandwidth
> per Hz of baseband bandwidth.  Digital techniques for speech
> transmission that can readily operate in less than 5kHz bandwidth
> (2.4kbps LPC, for example) sound like crap.  (They're intelligible, but
> they sound like a robot talking in the bottom of a tin can.)  The
> vocoders that provide good voice quality require quite a bit more
> transmission bandwidth.

You're correct, considering only efficiency.  But remember that CW is a
much more efficient means of communication than SSB, in terms of
required RF bandwidth per Hz of baseband bandwidth.


I remember having similiar discussions using the same arguments on both
sides, back in the sixties.  As a young man working in the development
of the integrated circuits for the LEM computer for the Apollo program,
I walked away from ham radio as being too backward, outdated and out
of touch.  Telemetry of the time seemed to put CW in a category with
smoke signals and stone knives.

A few years ago, I picked up a shortwave radio at a flea market, and
tuned in W1AW code practice.  To my amazement, I could still copy it
after 30 years.  I picked up the general class ticket the next month,
and passed the Extra class one month later.

I find that I enjoy the CW most of all.  It matters not that it is
outmoded, I consider every aspect of ham radio outmoded, including
satellite work.  It's all old hat (But it's fun to fool with) in
light of modern technology.

73,

Jim - AD4VL


From [e-mail] Tue Aug 27 16:23:48 1996
Path: news2.epix.net!news3.epix.net!uunet!in2.uu.net!news1.gte.net!usenet
From: Jim Conn <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Commercial CW use
Date: Thu, 22 Aug 1996 14:25:15 -0700
Organization: GTE
Lines: 27
Message-ID: <[e-mail]>
References: <[e-mail]> <4uniqt$[e-mail]> <[e-mail]> <4v021c$[e-mail]> <[e-mail]> <4vgea5$[e-mail]>
NNTP-Posting-Host: clw98062.gte.net
Mime-Version: 1.0
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Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.01E-GTE  (Win16; I)

I don't get it.  The HF bands are not useful for high speed digital work.
Anyone desiring to experiment with high speed digital modes can get into
ham radio and have a blast, without ever having to learn morse: the
code ticket was designed for this purpose.

As far as I am concerned, I use CW because it is fun.  If we remove the
requirment to learn CW in order to be a radio amateur operator on HF, we
effectively deny future generations of amateurs the opportunity to
communicate with foreign hams who cannot afford the elaborate rigs that
americans take for granted, and can only communicate with inexpensive,
easily constructed CW HF rigs.

Of course, hams could learn CW even if it was not a licensing requriment.
But you hit the nail on the head when you spoke of the "CW Subbands" in
a yearning way.  Many hams want to eliminate those subbands so they can
move their phone contacts there.

SSB is just as outmoded as a means of communication as FM and CW, if you
only consider the amount of data you are able to pass in the shortest
period of time.

Everything stays in perspective as long as we keep in mind Amateur Radio
is a hobby, not a vocation.  We do it for fun, not necessarily
throughput.  Testing should encompass ham radio from A to Z, from
amplifier to zero-bias.  CW falls somewhere in there between A and Z.

Jim - AD4VL


From [e-mail] Tue Aug 27 16:23:49 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!newsfeed.internetmci.com!news.sprintlink.net!news-stk-200.sprintlink.net!newsjunkie.ans.net!newsfeeds.ans.net!interaccess!d136.w.interaccess.com!user
From: [e-mail] (Dave Moorman)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Commercial CW use
Date: 23 Aug 1996 12:52:03 GMT
Organization: InterAccess, Chicago's best Internet Service Provider
Lines: 18
Message-ID: <[e-mail]>
References: <[e-mail]> <4uniqt$[e-mail]> <[e-mail]> <4v021c$[e-mail]> <[e-mail]> <4vgea5$[e-mail]> <[e-mail]> <4viv8o$[e-mail]>
NNTP-Posting-Host: d148.w.interaccess.com

> Again, I must disagree ... I've traveled quite a bit ... even in poor
> countries in latin America, the hams have rigs comparable to ours,
> complete with DSPs, etc.  And you should see the antenna farms!
> (From my experience, foreign hams tend to be quite well-off financially
> for their own society ... much more so than American hams.)

You must be traveling in elite circles.  The yearly income in most
countries is a fraction of what it is in the States.  I'm sure the rich
folks do have big antenna farms, but your average-income ham in Latin
America is probably lucky to  put up a dipole and get on CW or maybe SSB.

Dave

--
Dave Moorman                               Be big, don't belittle!
Downers Grove
Illinois, USA
http://homepage.interaccess.com/~dmoorman/DavesPage.html


From [e-mail] Tue Aug 27 16:23:50 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!metro.atlanta.com!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Commercial CW use
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]> <4uniqt$[e-mail]> <[e-mail]> <4v021c$[e-mail]> <[e-mail]> <4vgea5$[e-mail]>
Date: Sat, 24 Aug 1996 15:00:05 GMT
Lines: 19

In article <4vgea5$[e-mail]> [e-mail] writes:
>
>Well said, Gary ... the concept of BANNING CW is foreign to MOST of us
>who feel that it should have been dropped asa REQUIREMENT *long* ago.
>
>I support the use of CW by those who like it and want to use it ...
>although I think the CW subbands are disproportionately large.

There *are no CW subbands* (at least not on HF). Leave the RTTY/data
subbands alone! That's where the most rapid HF activity growth is
occurring.

Gary

--
Gary Coffman KE4ZV          |    You make it,     | Due to provider problems
Destructive Testing Systems |    we break it.     | with previous uucp address
es
534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Tue Aug 27 16:23:51 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news3.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!metro.atlanta.com!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Commercial CW use
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4vgea5$[e-mail]> <[e-mail]> <4viv8o$[e-mail]> <[e-mail]>
Date: Sat, 24 Aug 1996 15:38:00 GMT
Lines: 43

In article <[e-mail]> dmoorman@interac
cess.com (Dave Moorman) writes:
>> Again, I must disagree ... I've traveled quite a bit ... even in poor
>> countries in latin America, the hams have rigs comparable to ours,
>> complete with DSPs, etc.  And you should see the antenna farms!
>> (From my experience, foreign hams tend to be quite well-off financially
>> for their own society ... much more so than American hams.)
>
>You must be traveling in elite circles.  The yearly income in most
>countries is a fraction of what it is in the States.  I'm sure the rich
>folks do have big antenna farms, but your average-income ham in Latin
>America is probably lucky to  put up a dipole and get on CW or maybe SSB.

The point is that there are very few "average income hams" except in
a few industrialized countries where "average income" is a substantial
sum. Amateur radio is not an activity in which those on subsistence
incomes participate to any great extent. A simple examination of the
relative numbers of amateurs in impoverished nations versus the number
in wealthier nations should make this abundantly clear. Substantially
only those elements of a society with disposable income participate.
And that's mainly the well to do in societies where there is little
middle ground between direst poverty and the upper class.

If you look at the pictures of foreign stations in QST and CQ, you'll
see the same sort of Japanese transceivers found in most US amteurs'
stations. It is rare indeed to see a homemade station, and when you
do, it usually turns out to be quite elaborate (read expensive). That's
because most foreign amateurs, just as most US amateurs, only homebrew
because they *want to*, and not because they have to. It usually isn't
cheaper to build a quality station than it is to buy one.

Some amateurs in the US and elsewhere *choose* to build and operate
cheap CW stations of marginal performance, but in almost every case
it *is* a choice, and not done by necessity. Homebrewing is great.
It is fun and educational. But it isn't a viable route for those
in dire poverty to enter amateur radio, even if they had the leisure
time to do so (which they almost certainly do not).

Gary
--
Gary Coffman KE4ZV          |    You make it,     | Due to provider problems
Destructive Testing Systems |    we break it.     | with previous uucp address
es
534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Tue Aug 27 16:23:52 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!nntp.newsfirst.com!nntp.crosslink.net!munnari.OZ.AU!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: Commercial CW use
Date: Mon, 26 Aug 1996 17:21:28
Organization: TRL
Lines: 42
Message-ID: <[e-mail]>
References: <[e-mail]> <4uniqt$[e-mail]> <[e-mail]> <4v021c$[e-mail]> <[e-mail]>
NNTP-Posting-Host: pcies4.trl.oz.au
X-Newsreader: Trumpet for Windows [Version 1.0 Rev Final Beta #7]



>And just as there was resistance to the change from spark, there
>will be those who resist the changeover from OOK Morse to better
>digital modulations and codings. Hopefully this time it won't
>require regulations banning the more archaic form to force the
>changeover. It makes me mildly unhappy that I can't play with
>a modulated arc transmitter just for the hell of it, and I
>suppose it would make Morse lovers unhappy if they couldn't
>play with their hand and ear methods just for the hell of it
>too.
>--
>Gary Coffman KE4ZV

Well said, as usual. Thanks Gary.

IMHO, the use of CW will not entirely die out, in the same way that
old crafts and customs are carried on by enthusiasts. To this day we still
have equestrian activities (did the automobile spell the end for the horse?),
archery, calligraphy (is calligraphy a reaction to standardised letter
writing?),  blacksmithing, model steam loco building etc. etc...the list could

go on.

There are many remarkable things that persons do for the simple pleasure that
the challenge brings. Jumping from heights with a parachute, climbing cliffs
and mountains etc. They don't have to do these things- the challenge is the
big attraction.

Well, for some, it's a bit like that with CW. The magic is right there; what,
with a few home-made items, it is possible to get in touch with some-one on
the other side of the world- no satellites, no metallic connection, no fancy
electronics, just an antenna and the ionosphere. And all the coding and
decoding is done in "in the head", complete with nuances, laughter and so on.
To me, that is the challenge.

I spend my working day surrounded by hi-tech communications hardware and
guru's. To use CW is just plain enjoyment. However, not for one moment would I

force it upon an uninterested person.

73, Kind Regards, Drew, VK3XU.  Telstra Research Laboratories.




From [e-mail] Tue Aug 27 16:23:53 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-stk-3.sprintlink.net!mssm.edu!news.sprintlink.net!new-news.sprintlink.net!news.netone.com!imci3!newsfeed.internetmci.com!in3.uu.net!news.accessone.com!news
From: [e-mail] (Ed Mitchell)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.antenna
Subject: Re: CORRECTION - FCC Ruling Will Require Some Hams to File Environmental Impact Reports
Date: 24 Aug 1996 02:23:57 GMT
Organization: Virtual Publishing Co.
Lines: 17
Message-ID: <4vlp3t$[e-mail]>
References: <[e-mail]> <4vcvs2$[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: vbook.accessone.com
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We've added a link to Ham Radio Online to the Frequently Asked Questions
about Cellular, PCS and Human Health issues, prepared by John Moulder, Ph.D.
You may find this information useful in this dicussion.

Some of the previous postings in this thread have contained interesting
information, often based on true stories, but also quoted incorrectly or
interpreted wrong. Unfortunately, I don't have time to respond in detail but
though it important to note that some of the info here is not correct.

Visit us at http://www.hamradio-online.com
------------------------
Ed (KF7VY) and Kim (N7VPL) Mitchell
email to [e-mail]
Visit Ham Radio Online, it's free! at
http://www.hamradio-online.com



From [e-mail] Tue Aug 27 16:23:55 1996
Path: news2.epix.net!news3.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news.ac.net!news1.erols.com!news
From: Steve Ickes <[e-mail]>
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.antenna
Subject: Re: CORRECTION - FCC Ruling Will Require Some Hams to File Environmental Impact Reports
Date: Fri, 23 Aug 1996 21:56:07 -0700
Organization: WB3HUZ/Baltimore
Lines: 39
Message-ID: <[e-mail]>
References: <[e-mail]> <4vcvs2$[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: col-as3s04.erols.com
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Fred McKenzie wrote:
>
> In article <[e-mail]>, [e-mail]
> (Gary Coffman) wrote:
> > There is documented evidence that exposures of greater than 10 mW/cm^2
> > can cause harm. In particular, cataracts or loss of focal flexibility
> > due to RF heating of the lens of the eye, and in some cases cancers.
>
> Gary-
>
> I believe you!  Now, how does that relate to the average Ham?  Although 10
> mW/cm^2 sounds like a miniscule amount, it doesn't sound so bad when you
> convert it to 100 W/M^2 (did I do that right?).
>
> What are "real world" exposure levels that a Ham is likely to encounter in
> each of several areas of the Ham spectrum?  Suppose I have a 100 Watt HF
> transceiver to a dipole, about 20 feet off the ground.  Is anyone at risk
> while I'm on the air?  What if I run a KW?  What if I use a beam that is
> 50 feet up?
>
> How about a typical Two Meter installation?
>
> What I'm leading up to, is that the FCC might accomplish more, if they
> were to perform the math (or make the measurements) for common situations,
> and publish examples where harm might occur.
>
> 73, Fred, K4DII


You're on the right track.  If you read the Report&Order, other services
like paging, cellular, etc, received exepmtions for specific scenarios
(like for a given antenna, antenna height, and power below some level).

Why the ARRL went with the silly "prudent avoidance" (whatever that
means)approach is beyond me.  What exemption did we wind up with?  One,
less than 50 watts (irrespective of freqy, mode, antenna type and height.
This makes no sense.  The ARRL "dropped the ball" again.

S


From [e-mail] Tue Aug 27 16:23:57 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!nntp04.primenet.com!nntp.primenet.com!news.sprintlink.net!news-stk-3.sprintlink.net!news.syspac.com!news
From: [e-mail] (Ohrstal Fembrock)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.antenna
Subject: Re: CORRECTION - FCC Ruling Will Require Some Hams to File Environmental Impact Reports
Date: Sat, 24 Aug 1996 16:28:45 GMT
Organization: Systems Solutions Inc. (Arizona's Internet Provider)
Lines: 26
Message-ID: <[e-mail]>
References: <[e-mail]> <4vcvs2$[e-mail]> <[e-mail]> <[e-mail]>
Reply-To: [e-mail]
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[e-mail] (Fred McKenzie) wrote:


>I believe you!  Now, how does that relate to the average Ham?  Although 10
>mW/cm^2 sounds like a miniscule amount, it doesn't sound so bad when you
>convert it to 100 W/M^2 (did I do that right?).
>
>What are "real world" exposure levels that a Ham is likely to encounter in
>each of several areas of the Ham spectrum?  Suppose I have a 100 Watt HF
>transceiver to a dipole, about 20 feet off the ground.  Is anyone at risk
>while I'm on the air?  What if I run a KW?  What if I use a beam that is
>50 feet up?
>
>How about a typical Two Meter installation?
>
>What I'm leading up to, is that the FCC might accomplish more, if they
>were to perform the math (or make the measurements) for common situations,
>and publish examples where harm might occur.
>
>73, Fred, K4DII


Now that makes sense Fred.  Will it happen?  Hell no. Because that
makes sense Fred.




From [e-mail] Tue Aug 27 16:23:58 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news3.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!eanews1!rsvl_ns!ernie!ernie.rsvl.unisys.com!sbs1
From: [e-mail] (Bruce Stough)
Subject: Re: Designing transformers
Sender: [e-mail] (News Admin)
Message-ID: <[e-mail]>
Date: Wed, 21 Aug 1996 14:10:53 GMT
Lines: 24
X-Nntp-Posting-Host: sbs1
References: <[e-mail]> <4vffoi$[e-mail]>
Organization: Unisys - Roseville, MN
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B]

If the higher imepedence side of the transformer is around 600 ohms or lower,
very good 9:1 transformers can be made using choke balans.  Three separate
1:1 choke balans wired in parallel on the low impedence side and in series
on the high impedence side on 125 or 250 ferite cores would be one option.
As long as the choking impedence of the windings is high enough, there will
be no core saturation.  CQ and ARRL have books by Sevik (sp?) which describe
such transformers.

Bruce Stough, AA0ED

>>
>>Anybody know a good site where to find practical information
>>of RF-transformers for impedance matching. Especially HP-transormers
>>for 1:9 and 9:1 ratios capable of handling up to 600 W CW. Also
>>information about different core materials needed and where to obtain
>>those cores. I need those to build up an linear for 2-30 MHz using
>>4 of MRF150/MRF140 FETs (600 W CW out).

>>73 de OH1DX / OH2LIG / Kari







From [e-mail] Tue Aug 27 16:23:59 1996
Path: news2.epix.net!news3.epix.net!uunet!in2.uu.net!cam-news-hub1.bbnplanet.com!howland.erols.net!agate!ames!tulane.edu!cpk-news-feed4.bbnplanet.com!news.udel.edu!diusys!dave
From: [e-mail] (Dave Dabell)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Designing transformers
Date: 22 Aug 1996 18:44:21 GMT
Organization: University of Delaware
Lines: 17
Message-ID: <4vi9q5$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: diusys.cms.udel.edu
X-Newsreader: TIN [version 1.2 PL2]

Motorola app note EB104 describes an HF amp using 4 MRF150's.
It gives details on the transformers used.  Communications
Concepts in Dayton, Ohio offers kits and parts for the amp.

  73,  dave  wa3u

Kari Kuusinen ([e-mail]) wrote:
: Hi you all.
:
: Anybody know a good site where to find practical information
: of RF-transformers for impedance matching. Especially HP-transormers
: for 1:9 and 9:1 ratios capable of handling up to 600 W CW. Also
: information about different core materials needed and where to obtain
: those cores. I need those to build up an linear for 2-30 MHz using
: 4 of MRF150/MRF140 FETs (600 W CW out).

: 73 de OH1DX / OH2LIG / Kari


From [e-mail] Tue Aug 27 16:24:00 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!holonet!colossus.holonet.net!newsfeed1.aimnet.com!nntp04.primenet.com!nntp.primenet.com!EU.net!sun4nl!rnzll3!sys3.pe1chl!rob
From: [e-mail] (Rob Janssen)
Subject: Re: Designing transformers
X-Newsreader: NN version 6.5.0 (NOV)
Reply-To: [e-mail]
Organization: PE1CHL
Message-ID: <[e-mail]>
References: <[e-mail]>
Date: Thu, 22 Aug 1996 12:15:25 GMT
Lines: 22

In <[e-mail]> Kari Kuusinen <[e-mail]> writes:

>Hi you all.
>
>Anybody know a good site where to find practical information
>of RF-transformers for impedance matching. Especially HP-transormers
>for 1:9 and 9:1 ratios capable of handling up to 600 W CW. Also
>information about different core materials needed and where to obtain
>those cores. I need those to build up an linear for 2-30 MHz using
>4 of MRF150/MRF140 FETs (600 W CW out).

You could try asking the maker's of the FETs (probably Motorola) and/or
a core maker (Amidon) for application notes or databooks.

I have an old Motorola "RF Semiconductors" manual and it has a few
application notes describing transistor amplifiers.

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


From [e-mail] Tue Aug 27 16:24:02 1996
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From: [e-mail] (Glenn E. Little)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.sca
Subject: Re: FCC Ruling Prohibits Unreasonable Restrictions on TV Antennas
Date: 25 Aug 1996 00:59:21 GMT
Organization: Amateur Radio WB4UIV
Lines: 29
Message-ID: <4vo8ha$[e-mail]>
References: <4u8u23$[e-mail]> <4ubedc$[e-mail]> <[e-mail]> <4ulrpr$[e-mail]> <[e-mail]> <n9jig-1508962030430001@0.0.0.0>
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In article <n9jig-1508962030430001@0.0.0.0>, [e-mail] (Rich Carlson)
says:
>
>Does anyone have the text of this ruling?  I am trying to get my townhouse
>association to allow a DBS dish and a discone for scanning on my roof, and
>this may help push me over the edge as it were...
>
>--
>Rich Carlson, N9JIG ([e-mail])
>
>ScannerMaster Illinois Communications Guide [phone]
>
>CARMA (Chicago Area Radio Monitoring Association) BBS [phone]
>PO Box 2681, Glenview IL 60025    SASE for sample newsletter.


It is available at www.fcc.gov.  It is longgggg.

This is where I found it after being alerted by the FCC Daily Digest.

Also on the Daily Digest.  Recently Centel Cellular was fined $3,000,000.00
for tower violations.  Seems that they do not understand Air Safety Zones.
A tower 187 feet high, 2.8 miles from runway, no lights!  Did not reply
to FCC for site data.  Filed with FAA 5 months after tower operational
for permission to erect tower. What a list of problems.  Fine reduced to
$2,000,000.00.  After 6 zeros, what does it matter the number in front?

73
Glenn Little
WB4UIV


From [e-mail] Tue Aug 27 16:24:03 1996
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From: [e-mail] (Rich Carlson)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.shortwaverec.radio.amateur.misc
Subject: Re: FCC Ruling Prohibits Unreasonable Restrictions on TV Antennas
Date: Sun, 25 Aug 1996 08:05:38 -0500
Organization: Sentry Publishing
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References: <4u8u23$[e-mail]> <4ubedc$[e-mail]> <[e-mail]> <4ulrpr$[e-mail]> <[e-mail]> <n9jig-1508962030430001@0.0.0.0> <4vnlch$[e-mail]>
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Yes, that is correct, and it does not help me.  I have decided to wait
until we move to a regular house, and get whatever the technology is then.

Thanks to all who assisted!



In article <4vnlch$[e-mail]>, [e-mail] (Don Sterner) wrote:

** In article <n9jig-1508962030430001@0.0.0.0>, Rich Carlson said...
** >
** >Does anyone have the text of this ruling?  I am trying to get my townhouse
** >association to allow a DBS dish and a discone for scanning on my roof, and
** >this may help push me over the edge as it were...
** >
**
** It looks like none of the other responders have mentioned that the
** ruling does NOT apply to owners of townhomes/condiminiums where the
** roof and surrounding real estate is not the sole property of the
** owner, but is shared by the group.
**
** If this is the case where you live, the ruling will not help you.
** --
** [e-mail]

--
Rich Carlson, N9JIG ([e-mail])

ScannerMaster Illinois Communications Guide [phone]

CARMA (Chicago Area Radio Monitoring Association) BBS [phone]
PO Box 2681, Glenview IL 60025    SASE for sample newsletter.


From [e-mail] Tue Aug 27 16:24:04 1996
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From: [e-mail] (Rob Neff)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.shortwave
Subject: Re: FCC Ruling Will Require Some Hams to File Environmental Impact Reports
Date: 21 Aug 1996 08:16:05 -0700
Organization: Screw the EPA, they screw us.
Lines: 14
Message-ID: <4vf97l$[e-mail]>
References: <4u2uvk$[e-mail]> <4uapth$[e-mail]> <[e-mail]> <4uvhre$[e-mail]> <[e-mail]> <4va49e$[e-mail]> <[e-mail]>
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"Brian E. Oakley" <[e-mail]> wrote:

> Hey Rob, go talk to W5RWW, he can teach you a little bit. 73. Brian.

Teach me what? What in my post are you reffering to?
But regardless, I am sure there is a lot I can learn from a ton of
Amateurs, thats why I love this hobby/service so much.
Always something you don't know, and a person willing to tell you
about it.

See ya

Rob Neff (N7ORY)



From [e-mail] Tue Aug 27 16:24:05 1996
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From: [e-mail] (Ohrstal Fembrock)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.shortwave
Subject: Re: FCC Ruling Will Require Some Hams to File Environmental Impact Reports
Date: Sat, 24 Aug 1996 01:29:31 GMT
Organization: Systems Solutions Inc. (Arizona's Internet Provider)
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Fred <[e-mail]> wrote:


snip


>>
>A terribly misdirected group.  May be so may not be so.  Do you have any
>facts to show that rf is harmless.

It is almost impossible to prove a negative.  Please show me a
definitive study with a properly established scientific basis that
will show that RF is harmful.  After all, it is your theory.

This is the same science that stated that bran was wonderful, only to
state a few short months later that it was not.  The same science that
stated that ALAR would kill everyone in the free world, only to state
later that the basis was flawed.  This is the same science that said
the cranberries would cause cancer in huge numbers of people, only to
be shown to be false.

Chocolate is SIMILAR to marijuana?  The center for science? and
disease control is headed by a bunch of people who at best are self
serving boobs, concerned only about perpetuating their high paying
jobs.

I don't KNOW if RF is harmful or not but virtually everything in the
human experience is harmful, or at least potentially harmful.  Cars
kill thousands every year but we raised the speed limit to 75 knowing
that there will be an incremental increase in the highway death toll.

The prez has declared that tobacco (cigarettes) are a nicotine
delivery system while VERY recently we de-drugged Nicorette gum.  My
mother has smoked for over 70 years and is in better shape than most
60 year olds I know.  I do not condone smoking but I believe that the
benefits to society COULD outweigh the negatives (agreed not likely
but every bit as speculative as your hypothesis)  BTW, could you name
any ... ANY person who has been shown to have died from second hand
smoke??  Why has the average lifespan increased in the last 200 years?

Point of speculation....  In 23 years scientists will determine that a
pack of cigarettes a day will decrease your chances to contract
PMS/Prostate trouble!

Every state (to my knowledge) has some sort of law regulating the sale
of cigarettes to minors so enacting new laws is just plain stupid
until we try to enforce the current laws.

Get a clue folks, the government is rapidly taking ALL of yur
Constitutional Rights away.  Read the Federalist Papers to understand
that the founding fathers were aware of this possibility and
considered it to be the biggest potential problem the country would
face.

>                                 Have you ever been in the near field
>of a broadcast antenna at 1KW even.  I have, not the facts or figures,
>but by personal experiance know that the inner ears heats up at a
>frequency of 1450 Khz and 1000 watts if you are there for any significant
>period of time (ie. 30 minutes or so)  Granted, amateur transmissions are
>usually short, but would you like a 4 El beam being fed with 1.5Kw pep rf
>pointed at your house????   I think not if it were your neighbors
>antenna. Do not poo poo the harm that non-ionizing radiation may or may
>not do.  It is best to treat it with a little respect and use good
>engineering practice at all times.  Hey, a well meaning, but misdirected
>group got a law passed because no one else has been able to prove them
>wrong with hard facts and figures.  I for one, after spending a few years
>in the position of a chief broadcast engineer, treat an radiation,
>non-ionizing or otherwise with respect.  remember your microwave oven
>operates in the middle of on ham band a about 1.2 gigahertz or so.  And
>it cooks things very swiftly.  Agreed it is not 3.9 Khz or 7.2, but it
>may be that the only differance is the power level and the exposer time??
>who know for sure. I don't and have met few rf engineers that are sure.
>Who wants to be the test dummy for this one fellows.  Do I hear any takers?





From [e-mail] Tue Aug 27 16:24:07 1996
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.shortwave
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!cam-news-hub1.bbnplanet.com!howland.erols.net!netcom.com!slwork
From: [e-mail] (Steve Work)
Subject: Re: FCC Ruling Will Require Some Hams to File Environmental Impact Reports
Message-ID: <[e-mail]>
Followup-To: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.shortwave
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
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Ohrstal Fembrock ([e-mail]) wrote:

: This is the same science that stated that bran was wonderful, only to
: state a few short months later that it was not.

It was only OAT bran that was wonderful, not all kinds of bran.

: Chocolate is SIMILAR to marijuana?

Yeah, but you'd have to eat 50 pounds of chocolate to get the kick of a
single reefer.

: The prez has declared that tobacco (cigarettes) are a nicotine
: delivery system while VERY recently we de-drugged Nicorette gum.

Not!  Nicorette was not de-drugged, it was taken off of prescription
status but is still very much regulated by the FDA, as are all
over-the-counter medications.


From [e-mail] Tue Aug 27 16:24:08 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.edu.tw!nctuccca.edu.tw!spring.edu.tw!serv.hinet.net!news.uoregon.edu!hunter.premier.net!netaxs.com!op.net!nntp04.primenet.com!nntp.primenet.com!news.asu.edu!ennfs.eas.asu.edu!cs.utexas.edu!bcm.tmc.edu!pendragon!news.msfc.nasa.gov!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news
From: Tom Phillips <[e-mail]>
Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: FS: Tektronix 453 scope
Date: 22 Aug 1996 21:47:59 GMT
Organization: AB5ZJ
Lines: 8
Message-ID: <4vikif$g8p$[e-mail]>
Xref: news2.epix.net rec.radio.amateur.digital.misc:16734 rec.radio.amateur.equipment:31777 rec.radio.amateur.homebrew:16460 rec.radio.amateur.misc:106034

For Sale; Dual Channel 50mhz Tektronix 453 scope.  This scope has
a delay time multiplier, and extends the actual frequency meas. to
over 110mhz (actual measurments).  Has original manual, and a 10x
probe.  No dents, scrathes, and all funtions work.  No bulbs or
LED's burnt out.

Price: $650.00
Contact Tom (AB5ZJ) at [e-mail]   or leave reply here


From [e-mail] Tue Aug 27 16:24:10 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!not-for-mail
From: Burt Fisher <[e-mail]>
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.sca
Subject: Ham Tin Gods (Some PBBS SYSOPS)
Date: Sun, 25 Aug 1996 07:24:26 -0400
Lines: 33
Message-ID: <[e-mail]>
References: <4u8u23$[e-mail]> <4ubedc$[e-mail]> <[e-mail]> <4ulrpr$[e-mail]> <[e-mail]> <n9jig-1508962030430001@0.0.0.0> <4vo8ha$[e-mail]>
Reply-To: [e-mail]
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This is a multi-part message in MIME format.

--------------1DB942D744B7
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit

Have I hit on a sore point?

--------------1DB942D744B7
Content-Type: text/plain; charset=us-ascii; name="aa0nn"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline; filename="aa0nn"

AA0NN sent me a message that he was deleting my message because he did
not like the subject title about what makes a loser. Why are some SYSOPS
Tin Gods? They are little wimpy men that are nothing in their everyday
life that become Tin Gods here on packet.

Was the Wizard of Oz a ham radio SYSOP?

Of course there are SYSOPs that have self confidence and allow points of
view they do not agree with

It appears Mr. Wolfe also is in violation of FCC rules as his address
does not correspond with where he is SYSOPing.

AA0NN              WOLFE, JOHN R                           LIC ISU  4-MAY-1995
EXTRA              6402 HAMPTON DR                         LIC EXP 22-MAR-2004
DOB 31-JUL-1962    ANCHORAGE            AK  99504          LST UPD  4-MAY-1995

Burt
--------------1DB942D744B7--



From [e-mail] Tue Aug 27 16:24:11 1996
Path: news2.epix.net!news3.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!dimensional.com!news.wizard.com !news.ici.net!news
From: Bruce KD1MW <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: HARDLINE CONNECTORS WANTED
Date: Sun, 25 Aug 1996 15:30:44 +0000
Organization: The Internet Connection
Lines: 7
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CC: [e-mail]

Hello all:       I am looking for "N" type hardline ends -HCC 78-50NM,
too fit a length of 1" hardline (flexwell) that I just picked up,
used.  The cable has lettered on it,  Cablewave Systems
16733-810929-00 HCC 78-50  TCC 650 972 FT Flexwell.  There is one
end on the line now with air valve and guage 0-5 PSI.  Please
advise, any help is appreciated.  Also what gas gets compressed in
this line?  Thanks, Bruce KD1MW  [e-mail]


From [e-mail] Tue Aug 27 16:24:12 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-stk-11.sprintlink.net!tank.news.pipex.net!pipex!news.be.innet.net!INbe.net!news.nl.innet.net!INnl.net!hunter.premier.net!news-res.gsl.net!news.gsl.net!usenet.eel.ufl.edu!spool.mu.edu!agate!howland.erols.net!news2.digex.net!news5.digex.net!haven.umd.edu!hecate.umd.edu!rclayton
From: [e-mail] (Rodney Clayton)
Newsgroups: rec.radio.amateur.homebrew
Subject: Help with ASDEN PCS 2000 repair.
Date: 15 Aug 1996 01:26:59 GMT
Organization: University of Maryland, College Park
Lines: 13
Message-ID: <4utud3$[e-mail]>
NNTP-Posting-Host: holmes.umd.edu
X-Newsreader: TIN [version 1.2 PL2]

My ASDEN PCS-2000 appears to put out less power unless I de-tune the
antenna. I have measured the antenna with an swr meter and when it
shows a low SWR the power indicator LEDs on the from of the unit
show a reduction in power. If the tune the antenna for max indication
on the LEDs then receive performance is affected. The unit has a
final amp. module labeled VP-15E 13LF on the schematic. I am not sure
if this module has the crowbar circuit internally or if I have a
problem some place else.
Any help appreciated.
Rod
KA3BHY
[e-mail]



From [e-mail] Tue Aug 27 16:24:12 1996
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From: [e-mail](Robert Travis Lewis)
Newsgroups: rec.radio.amateur.homebrew
Subject: hf amp kit ??
Date: 21 Aug 1996 18:10:40 GMT
Organization: Netcom
Lines: 5
Message-ID: <4vfjf0$[e-mail]>
NNTP-Posting-Host: aus-tx2-04.ix.netcom.com
X-NETCOM-Date: Wed Aug 21  1:10:40 PM CDT 1996

Howdy,  Does anyone know of a source for an HF amp kit?  I'm not
talking about just plans, but a full kit.

 Robert Lewis
 N5ODJ


From [e-mail] Tue Aug 27 16:24:13 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!EU.net!usenet2.news.uk.psi.net!uknet!usenet1.news.uk.psi.net!uknet!psinntp!psinntp!psinntp!xetron.com!news
From: [e-mail] (Jack Giehl)
Subject: HV connectors still avalable
Message-ID: <[e-mail]>
Sender: [e-mail]
Nntp-Posting-Host: jackg.xetron.com
Reply-To: Jack Giehl <[e-mail]>
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References: <1996Aug19.190838.616@main03>
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Lines: 11

In article <1996Aug19.190838.616@main03>, [e-mail] says...
>
>I'm rehabbing a K2RIW...originally supplied via a Millen HV connector.
>Anyone have a few of these just gathering dust?

Joe,  you might be able to get the Millen high voltage connectors
PN 37001 from Millen.  Their number is 508-975-2711.  Let me know
if they still have these parts...

Jack, WB8BFS



From [e-mail] Tue Aug 27 16:24:14 1996
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From: [e-mail] (Wes Stewart)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Is ARRL's MicroSmith software any good?
Date: Sun, 25 Aug 1996 17:40:06 LOCAL
Organization: StarNet
Lines: 36
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References: <4vklfh$[e-mail]>
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In article <4vklfh$[e-mail]> [e-mail] (Jeff Duntemann)
 writes:
>From: [e-mail] (Jeff Duntemann)
>Subject: Is ARRL's MicroSmith software any good?
>Date: Fri, 23 Aug 1996 15:13:34 GMT

>I've been teaching myself impedence matching via Smith chart recently,
>and it's going reasonably well.  I noticed that ARRL sells a software
>package that emulates the Smith chart, and I'm curious to hear of what
>other people think of it.  Specifically I want to design simple power
>amps in the 5-30 watt range using transistors like Motorola's that are
>fully characterized for series input and output impedence.  In other
>words, I don't have to guess; I have the complex numbers from the data
>sheets and just need to calculate the conjugates to create a good
>match on both sides.

>Is MicroSmith useful for this sort of thing?  Or is paper just as
>good?

Microsmith is fine; I have a copy.  However, for what you want to do, Motorola

has a freeware program, "MIP", if I recall the name correctly.  It has a
couple of little quirks, but the price is right.

I got a copy direct from Motorola on disk, but I think you probably can find
it online some place.

73, Wes -- N7WS

>Do let us know.

>--73--

>--Jeff Duntemann KG7JF
>  Scottsdale, Arizona





From [e-mail] Tue Aug 27 16:24:15 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!ott.istar!istar.net!n3ott.istar!news.citenet.net!medspec!zippy
From: [e-mail] (ZIPPY)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: knight-kit walkie talkies
Message-ID: <[e-mail]>
Date: Tue, 20 Aug 96 22:59:00 -0500
Distribution: world
Organization: Media Spectrum:  Montreal, Quebec - [phone]
Reply-To: [e-mail] (ZIPPY)
References: <[e-mail]>
X-Newsreader: PCBoard Version 15.22
X-Mailer: PCBoard/UUOUT Version 1.20
Lines: 2

Your best bet(s) would be to check at big flea markets, and don't
neglect the "Ham-fests"..


From [e-mail] Tue Aug 27 16:24:16 1996
Path: news2.epix.net!news3.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news.msfc.nasa.gov!news.larc.nasa.gov!night.primate.wisc.edu!tmpnews.crd.ge.com!news.crd.ge.com!rebecca!newserve!ntimofee
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: looking for FT-8500 ->PC pinouts
Date: 21 Aug 1996 12:36:33 GMT
Organization: Binghamton University, Binghamton, NY
Lines: 8
Message-ID: <4vevsh$[e-mail]>
NNTP-Posting-Host: 128.226.1.2
X-Newsreader: TIN [version 1.2 PL2]

        I am would like to play around with the computer interface
for my FT-8500.  Has anyone had any luck at making a PC to 8500 data
cable.  I need the pinouts for such a beast.

Thanks
Mike
N2XXA
[e-mail]


From [e-mail] Tue Aug 27 16:24:17 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!nntp04.primenet.com!nntp.primenet.com!winternet.com!news
From: Mark Brown <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Measuring 1/4 Wavelength in Coax
Date: Wed, 21 Aug 1996 13:54:25 -0700
Organization: StarNet Communications, Inc
Lines: 39
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: 206.146.5.209
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.01 (Win16; I)

Joseph M. Zawodny wrote:
>
> Thanks for reading this,
>
>         I know I am supposed to know all this, but before I start
> cutting coax I need to be certain.  I am building a pair of phasing
> lines / impedance transformers to stack a pair of 70cm yagis.  I
> need each line to be 5.25 wavelengths (wl) in 75 Ohm coax so I can
> get the correct spacing between yagis and also transform the 50 Ohm
> antenna impedance to 100 Ohms at the "T" where they'll attach to
> the 50 Ohm feedline.  My question is this: What is the best way to
> assure that I am getting exactly an odd integer multiple of quarter
> wavelengths in my 5.25 wl lines?  If the Mfgr's velocity factor (0.78)
> is off by 5% it adds up to a 1/4 wl error over 5.25 wl of line so,
> I need a way to measure the proper functioning of the 1/4 wl (actually
> 21/4 wl in my case) transformer.  My original thought is to solder a
> 100 Ohm resistor across one end of the 75 Ohm coax and measure the
> SWR at the other end at the frequency of interest (435 MHz).  If I was
> dealing with just a 1/4 wl length of coax I could just trim it to
> resonance at 435MHz, but I do not believe this will work with 5.25 wl
> lengths.
>
> Any thoughts, comments, or experiences are welcomed.
>
>         73,
>
> --
> Work: Dr. Joseph M. Zawodny                     Play: Joe Zawodny
>       NASA Langley Research Center                    [e-mail]
>       E-mail: [e-mail]               [e-mail]
>       [phone]  [phone] FAXHi All
     I use a quarter wavelength power divider built from 1" square
aluminun tubing with a brass center conductor. The dimensions for the
center conductor can be found in the ARRL handbook. (I think it is 2.33
to 1- not positive though) I am using one of these on 2 meters & built
one for 70cm for a friend & have 1.1 to 1 swr through them, you also get
to use 50 ohm coax to the antennas.
   73
   Mark


From [e-mail] Tue Aug 27 16:24:18 1996
Path: news2.epix.net!news3.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news.ais.net!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Modern digital versus SSB and Morse (was Re: Commercial CW use)
Date: 26 Aug 1996 00:17:32 GMT
Organization: American Information Systems, Inc.
Lines: 13
Message-ID: <4vqqes$[e-mail]>
References: <4viv8o$[e-mail]> <[e-mail]> <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ts03-10.dialup.ais.net
X-Newsreader: IBM NewsReader/2 v1.2.5

In <[e-mail]>, [e-mail] (Gary Coffman
) writes:

A whole bunch of REALLY GOOD, sensible, coherent arguments against the
rediculous mythology of the "CW forever" crowd.

That was good stuff, Gary ... I'm glad we agree ... I'd hate to have to
try and come up with a response purporting to refute what you said.

73,
Carl - wa6vse
[e-mail]




From [e-mail] Tue Aug 27 16:24:19 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Gary Coffman)
Subject: Re: NTSC >> PAL Converter kits/projects????
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]>
Date: Sat, 24 Aug 1996 16:48:39 GMT
Lines: 48

In article <[e-mail]> [e-mail].A
U (Mark Aitken) writes:
>I watch PANAMSAT-2 satelitte here in Australia,  basically CNNi.
>
>One problem is that it is received in the American NTSC format of
>video transmission and here in Australia we use PAL.
>
>I know that NTSC to PAL converters are available as a ready to use
>item but would be interested in building one.
>
>Does anyone know of kits or projects (cct's) for such a project?
>
>Thanks for any help you can offer.

This used to be incredibly hard and incredibly expensive. Now it
is merely hard and expensive. You're far better off attempting to
modify a PAL TV set to accept NTSC than you are to build a standards
converter.

Lets see what's involved. First you need to matrix decode the incoming
NTSC video down to component RGB. Then using flash A/D converters slaved
to a 14.318 MHz sample clock which is locked to 4x incoming color burst,
you write those component samples into three frame store memories,
interpolate them into secondary PAL frame memories to make the extra
scan lines PAL has which NTSC doesn't, then clock them out of the memories
to D/A converters slaved to a PAL sync generator, and finally feed them
to a PAL matrix encoder to produce composite PAL video.

Since the frame rates of the two TV standards are different, you have
to "slip" frames from time to time to keep from overflowing/underflowing
the frame memories. Fortunately this is easier going from NTSC to PAL
than it is going the other way (you have to repeat frames going the
other way and so need a *third* set of frame store memories).

You need fast flash A/D and D/A converters, gobs of fast dual port
memory, a fast interpolator, and several digital PLLs to keep everything
in sync. Parts cost alone dwarfs the cost of a NTSC receiver. It's a
lot easier to tweak the sync circuits in a monitor, modify the color
matrix decoder, and retune the sound IF so that a PAL set can receive
NTSC than it is to do a standards converter. Oh, perhaps you could do
a nasty one on the cheap, but the picture quality would be worse than
just using NTSC equipment.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | Due to provider problems
Destructive Testing Systems |    we break it.     | with previous uucp address
es
534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Tue Aug 27 16:24:20 1996
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From: [e-mail] (ZIPPY)
Newsgroups: rec.radio.amateur.homebrew
Subject: Phono to CD/AUX on Stereo?
Message-ID: <[e-mail]>
Date: Tue, 20 Aug 96 23:01:00 -0500
Distribution: world
Organization: Media Spectrum:  Montreal, Quebec - [phone]
Reply-To: [e-mail] (ZIPPY)
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X-Mailer: PCBoard/UUOUT Version 1.20
Lines: 4

That souldn't ba any problem it's pretty straightforeward:

        connect a stereo wire from your single unti to your stereo
receiver, simple.


From [e-mail] Tue Aug 27 16:24:22 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Question abt Push-pull RF Amplifier plate tank circuits
Date: 21 Aug 1996 19:08:56 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 30
Sender: [e-mail]
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References: <4ve3cq$[e-mail]>
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In article <4ve3cq$[e-mail]>, [e-mail] (Mark
Mandelkern) writes:

>
>Also, there is less chance of a VHF
>parasitic circuit set up via the condenser through ground.

The VHF parasitic circuit is usually mostly internal to the tube in a well
designed and laid out PA. The tube's grid structure is the major player.
Tubes with long thin grid leads and large open grids (811A, 572B, 3-1000,
3CX1200A and D 7) all have low self-neutralizing frequencies and can be
prone to parasitics.

Tubes with small compact grids and short coaxial grid connections (8877,
3CX3000, 4CX1000, 4CX250) are relatively immune to parasitics when grids
are properly grounded.

So far as the anode circuit, what happens beyond the tank capacitor has
little effect on VHF stability. What we absolutely DO want is the
capacitor to be well grounded for VHF, and VERY close to the tube. If that
is done, only the connections between the capacitor and the tube remains
the major player in anode VHF resonance. Inserting a suppressor at that
point will allow us to control VHF path losses.

The resistor used in the suppressor MUST be large compared to the
impedance of the VHF path, and small compared to the reactance of the
suppression coil. Making the VHF path longer and less predictable by not
grounding the capacitor moves things in the wrong direction.

73 Tom


From [e-mail] Tue Aug 27 16:24:23 1996
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From: adriaan <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: radio amateurs from Apeldoorn
Date: Mon, 26 Aug 1996 00:09:24 -0700
Organization: Planet Internet
Lines: 22
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Radiozendamateurs in Apeldoorn / Hams from Apeldoorn
----------------------------------------------------

Nieuwe opzet / New page

Op de volgende homepage: www.pi.net/~adpe1khp/home.html , zijn velen
activiteiten te vinden  van de Radiozendamateurs in Apeldoorn.
Zoals een foto boek over de velddag 1996.
En een groot aantal verwijzingen de wereld in.

On the hoempage: www.pi.net/~adpe1khp/home.html, you can find a lot
of activits of hams from Apeldoorn. But also links to the ham world.
With a lot of pictures of the fieldday 1996.

Send me a file if you like what you did see....

Greetings from Apeldoorn.
Groeten uit Apeldoorn

Adriaan pe1khp




From [e-mail] Tue Aug 27 16:24:24 1996
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From: Phil Wakely <[e-mail]>
Newsgroups: rec.antiques.radio+phono,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.space,rec.radio.cb,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap,rec.video.satellite.dbs,rec.video.satellite.europe,rec.video.satellite.misc,rec.video.satellite.tvro
Subject: Re: SAMS Needs Your Electronics URLs
Date: 23 Aug 1996 12:05:57 GMT
Organization: Scientific Generics Ltd.
Lines: 20
Message-ID: <4vk6r5$[e-mail]>
References: <4varvc$[e-mail]> <4vcg3p$[e-mail]> <321a927c.1695915@206.13.95.227> <[e-mail]>
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[e-mail] (Tim Gerchmez) wrote:
>On Wed, 21 Aug 1996 04:46:16 GMT, [e-mail] (Gregg) wrote:
>
>
>>>Vs lbh pna ernq guvf, lbh ernyyl bhtug gb trg bhg zber
>>
>>Url!  Jung xvaq bs n penpx vf gung?  :-D
>
>Urururur.. V gubhtug EBG13 jnf bhg bs qngr.. guvf vf gur svefg gvzr
>V'ir frra vg hfrq va dhvgr n juvyr ;)
>

Jung vf/jnf EBG13 ??









From [e-mail] Tue Aug 27 16:24:25 1996
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From: [e-mail] (Kenneth E. Harker)
Newsgroups: rec.antiques.radio+phono,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.space,rec.radio.cb,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap,rec.video.satellite.dbs,rec.video.satellite.europe,rec.video.satellite.misc,rec.video.satellite.tvro
Subject: Re: SAMS Needs Your Electronics URLs
Date: Sun, 25 Aug 1996 11:47:13 -0500
Organization: The University of Texas at Austin
Lines: 46
Message-ID: <[e-mail]>
References: <4varvc$[e-mail]> <4vcg3p$[e-mail]> <321a927c.1695915@206.13.95.227> <[e-mail]> <4vk6r5$[e-mail]> <[e-mail]>
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In article <[e-mail]>, [e-mail] (Tim
Gerchmez) wrote:

> On 23 Aug 1996 12:05:57 GMT, Phil Wakely <[e-mail]> wrote:
>
> >[e-mail] (Tim Gerchmez) wrote:
> >>On Wed, 21 Aug 1996 04:46:16 GMT, [e-mail] (Gregg) wrote:
> >>
> >>
> >>>>Vs lbh pna ernq guvf, lbh ernyyl bhtug gb trg bhg zber
> >>>
> >>>Url!  Jung xvaq bs n penpx vf gung?  :-D
> >>
> >>Urururur.. V gubhtug EBG13 jnf bhg bs qngr.. guvf vf gur svefg gvzr
> >>V'ir frra vg hfrq va dhvgr n juvyr ;)
> >>
> >
> >Jung vf/jnf EBG13 ??
> >
>
> Tvira gung lbh rapbqrq gur nobir, lbh onfvpnyyl nyernql xabj jung vg
> vf.  Vg'f n fvzcyr Hfrarg rapbqvat zrgubq (sbetbg jurer vg bevtvangrq,
> fbzrbar ryfr pbhyq cebonoyl gryy lbh).  V unqa'g rire frra vg hfrq
> orsber hagvy guvf guernq fgnegrq.  Zl arjfernqre (Ntrag .99S) vapyhqrf
> n EBG13 rapbqre/qrpbqre, fb V'z abg qbvat guvf ol unaq ;)

Gur svefg checbfr V rire fnj EBG-13 hfrq sbe (onpx va 1991 be gurernobhgf)
jnf gb uvqr rvgure gur chapuyvar bs be na ragver wbxr gung jnf cbgragvnyyl
bssrafvir be bs n evfdhr angher, cercraqrq jvgu n pyrnegrkg qvfpynvzre, fb
nf gb nyybj gur vaqvivqhny ernqre gur bcgvba bs jurgure be abg gb ivrj gur
zngrevny.  V'z fher gurer ner bgure tbbq ernfbaf sbe vg nf jryy.

Nf gb jurer vg bevtvangrq, vg'f n irel fvzcyr Pnrfne pvcure gung'f orra
nebhaq n ybat juvyr (fvapr ng yrnfg gur qnlf bs Whyvhf Pnrfne) - lbh whfg
fuvsg rirel yrggre 13 fcnprf va gur nycunorg (jenccvat nebhaq nf
arprffnel.)  V'z abg pregnva jung "EBG" zrnaf be jurer vg pnzr sebz,
gubhtu.

--
---------------------------------------------------------------------
Kenneth E. Harker                               [e-mail]
University of Texas at Austin                     Amateur Call: N1PVB
Department of the Computer Sciences                "Long Live Peent!"
Taylor Hall TAY 2.124        Maintainer of the Linux Laptop Home Page
Austin, TX 78712-1188 USA     http://www.cs.utexas.edu/users/kharker/
---------------------------------------------------------------------


From [e-mail] Tue Aug 27 16:24:27 1996
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From: [e-mail] (Marty Albert)
Newsgroups: rec.antiques.radio+phono,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.space,rec.radio.cb,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap,rec.video.satellite.dbs,rec.video.satellite.europe,rec.video.satellite.misc,rec.video.satellite.tvro
Subject: Re: SAMS Needs Your Electronics URLs
Date: Sun, 25 Aug 1996 04:56:34 GMT
Organization: TruCom Internet Services
Lines: 87
Message-ID: <4vomi5$[e-mail]>
References: <4varvc$[e-mail]>
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[e-mail] (J Adams) wrote:

>Electronics Resource Internet Addresses Needed
>               for Publisher.
>==============================================
>To all Electronics Companies, Service Person-
>nel, Webmasters & Hobbyists,

>I am preparing a book tentatively titled "Sam's
>Internet Guide to the Electronics Industry", to
>be published by Howard W. Sams & Co. and PROMPT
>Publications.  The book will contain site add-
>resses for electronics resources.  Companies,
>organizations and individual web creators are
>encouraged to fill out a simple FORM at the ad-
>dress below.
>-----------------------------------------------
>     http://web.idirect.com/~ifx/book/
>-----------------------------------------------
>In addition, any electronics related addresses
>or resources you run into while surfing please
>let me know by filling out said form.

>If you lack FORMS capability send an email with
>the info below.  I am especially interested in
>sites offering simple electronics repair data,
>service specs and hobbyist help-pages. Other
>resources are more than welcome. Top Urls will
>be printed in this directory and updated in
>future issues.
>-------------------------------------------------
>Name:
>Company Name:
>Nature of Business:
>Address http:
>Other Addresses:
>FTP Site:
>E-mail Contact:
>E-mail Main (info):
>Webmaster:
>Listserv:
>How often is your website updated:
>What type of information can be found on your
> website or special features:
>Has the WWW helped your business:
>Comments:
>-------------------------------------------------
>Send to John Adams -- [e-mail]

>If you know of any other Electronics related
>links please let me know in an email or a blank
>form.

>Thank you in advance. John Adams -- Author

>John J. Adams   |  "Forever Learning"    |
>Author          |  "Forever Questioning" |
>Web Designer    |  "Forever Creating"    |

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

>INFINET-FX @ http://web.idirect.com/~ifx/


I assume that this book will be provided free to all who submit or are
just trying to get us all to:

  1) Do all your work
  2) Still pay for the book

Just curious... I gave up doing research for others without pay when I
got my degree.

Take Care & 73



Marty Albert - [e-mail]
Amateur Radio: KC6UFM@KC6UFM.#SEMO.MO.USA.NOAM

Heartland Internet Services

*****************************************************
Cheap Long Distance! Just 12.9 cents per minute!
http://freedomstarr.com/?AL7837318
*****************************************************



From [e-mail] Tue Aug 27 16:24:28 1996
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From: [e-mail] (Jim Christensen)
Newsgroups: rec.antiques.radio+phono,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.space,rec.radio.cb,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap,rec.video.satellite.dbs,rec.video.satellite.europe,rec.video.satellite.misc,rec.video.satellite.tvro
Subject: Re: SAMS Needs Your Electronics URLs
Date: 26 Aug 1996 04:13:51 GMT
Organization: Organization For the Salvation of our Frequencies
Lines: 36
Message-ID: <4vr89v$[e-mail]>
References: <4varvc$[e-mail]> <4vcg3p$[e-mail]> <321a927c.1695915@206.13.95.227> <[e-mail]> <4vk6r5$[e-mail]> <[e-mail]> <[e-mail]> <4vqfae$[e-mail]> <4vqiur$[e-mail]>
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In article <4vqiur$[e-mail]>, [e-mail] says...
>
>In <4vqfae$[e-mail]> [e-mail] (GeorgeS) writes:
>>
>>In article <[e-mail]>,
>>[e-mail]
 says...
>>
>>>Nf gb jurer vg bevtvangrq, vg'f n irel fvzcyr Pnrfne pvcure gung'f
>orra nebhaq n ybat juvyr (fvapr ng yrnfg gur qnlf bs Whyvhf Pnrfne) -
>lbh whfg fuvsg rirel yrggre 13 fcnprf va gur nycunorg (jenccvat nebhaq
>nf arprffnel.)  V'z abg pregnva jung "EBG" zrnaf be jurer vg pnzr sebz,
>>>gubhtu.
>>>
>>
>>My guess is ROT13 is short for ROTATE 13. If you imagine the alphabet
>on a wheel, you would cipher the text by rotating the wheel 13 spaces
>>
>
>By goom, you're right!  I did it the hard way - I noticed Ken Harker
>had capitalized a V in the middle of one of his sentences.  I assumed
>this was "I" (what other single letter do we capitalize?) and
>translated (rotated) the alphabet accordingly.  Everything fell out
>nicely from there.
>
>After deciphering "If you can read this, you really ought to get out
>more," I decided the effort greatly outweighed the rewards!
>
>- Jeff (wrss)

Gurer vf nabgure ernyyl rnfl jnl gb qrpvcure guvf. Vs lbh ner hfvat Jvaivz nf
n
arjf ernqre, nyy lbh unir gb qb vf uvg PGEY. E naq vg punatrf gur grkg evtug
orsber lbhe irel ryes.

Jim
>



From [e-mail] Tue Aug 27 16:24:29 1996
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From: [e-mail] (GeorgeS)
Newsgroups: rec.antiques.radio+phono,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.space,rec.radio.cb,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap,rec.video.satellite.dbs,rec.video.satellite.europe,rec.video.satellite.misc,rec.video.satellite.tvro
Subject: Re: SAMS Needs Your Electronics URLs
Date: 25 Aug 1996 21:07:26 GMT
Organization: shore.net
Lines: 13
Message-ID: <4vqfae$[e-mail]>
References: <4varvc$[e-mail]> <4vcg3p$[e-mail]> <321a927c.1695915@206.13.95.227> <[e-mail]> <4vk6r5$[e-mail]> <[e-mail]> <[e-mail]>
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In article <[e-mail]>,
[e-mail]
 says...

>Nf gb jurer vg bevtvangrq, vg'f n irel fvzcyr Pnrfne pvcure gung'f orra
>nebhaq n ybat juvyr (fvapr ng yrnfg gur qnlf bs Whyvhf Pnrfne) - lbh whfg
>fuvsg rirel yrggre 13 fcnprf va gur nycunorg (jenccvat nebhaq nf
>arprffnel.)  V'z abg pregnva jung "EBG" zrnaf be jurer vg pnzr sebz,
>gubhtu.
>

My guess is ROT13 is short for ROTATE 13. If you imagine the alphabet on a
wheel, you would cipher the text by rotating the wheel 13 spaces



From [e-mail] Tue Aug 27 16:24:30 1996
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From: [e-mail](Jeff Anderson)
Newsgroups: rec.antiques.radio+phono,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.space,rec.radio.cb,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap,rec.video.satellite.dbs,rec.video.satellite.europe,rec.video.satellite.misc,rec.video.satellite.tvro
Subject: Re: SAMS Needs Your Electronics URLs
Date: 25 Aug 1996 22:09:31 GMT
Organization: Netcom
Lines: 28
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References: <4varvc$[e-mail]> <4vcg3p$[e-mail]> <321a927c.1695915@206.13.95.227> <[e-mail]> <4vk6r5$[e-mail]> <[e-mail]> <[e-mail]> <4vqfae$[e-mail]>
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In <4vqfae$[e-mail]> [e-mail] (GeorgeS) writes:
>
>In article <[e-mail]>,
>[e-mail]
 says...
>
>>Nf gb jurer vg bevtvangrq, vg'f n irel fvzcyr Pnrfne pvcure gung'f
orra nebhaq n ybat juvyr (fvapr ng yrnfg gur qnlf bs Whyvhf Pnrfne) -
lbh whfg fuvsg rirel yrggre 13 fcnprf va gur nycunorg (jenccvat nebhaq
nf arprffnel.)  V'z abg pregnva jung "EBG" zrnaf be jurer vg pnzr sebz,
>>gubhtu.
>>
>
>My guess is ROT13 is short for ROTATE 13. If you imagine the alphabet
on a wheel, you would cipher the text by rotating the wheel 13 spaces
>

By goom, you're right!  I did it the hard way - I noticed Ken Harker
had capitalized a V in the middle of one of his sentences.  I assumed
this was "I" (what other single letter do we capitalize?) and
translated (rotated) the alphabet accordingly.  Everything fell out
nicely from there.

After deciphering "If you can read this, you really ought to get out
more," I decided the effort greatly outweighed the rewards!

- Jeff (wrss)




From [e-mail] Tue Aug 27 16:24:31 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!nntp04.primenet.com!nntp.primenet.com!news.primenet.com!news.primenet.com!not-for-mail
From: Bob Doyle <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Solid state AM -- collector modulated?
Date: 24 Aug 1996 22:32:08 -0700
Organization: Primenet Services for the Internet
Lines: 25
Message-ID: <[e-mail]>
References: <4von0p$[e-mail]>
X-Posted-By: root@206.165.20.56 (doyle)
X-Mailer: Mozilla 3.0b5aGold (X11; I; Linux 2.0.14 i486)
MIME-Version: 1.0
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John D. Seboldt wrote:
>
> I've built the CCI power amp kit -- based on Motorola AN779 (push-pull
> MRF454's).  I might want to try a little bit of AM, and I know if you
> want to amplify AM with a linear you have to keep the PEP at the rated
> output, thus carrier at about 1/4 the PEP rating of the amp.
>
> Any remote chance one could collector modulate this amp (assuming you
> re-bias it for Class C? [easy to do])?  Would the power ratings end up
> similar to linear amplification?

Yup, it's possible.  Airborne VHF communications radios work that way.
If you want to try this you need to be aware that the input and output
matches for the transistor devices may need modifications.  As you will
recall, the input and output impedances for a class c amplifier are
strongly dependant on the input and output power levels.  With collector
modulated AM, the power levels are constantly changing.

The inherent non-linear behavior is tough to model correctly and the RF
devices don't have good specifications to work in that manner.  The best
I've seen done is just to diddle with the matches until is works...  Any
body else?

1/4 of PEP is correct.  We use 100 Watt devices to get 25 Watts of
carrier power.


From [e-mail] Tue Aug 27 16:24:32 1996
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From: Bob Doyle <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Solid state AM -- collector modulated?
Date: 25 Aug 1996 22:14:02 -0700
Organization: Primenet Services for the Internet
Lines: 20
Message-ID: <[e-mail]>
References: <4von0p$[e-mail]> <[e-mail]> <[e-mail]>
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John Rabson wrote:
>
> I tried this 30 years ago on a 160 m PA and found that the output
> capacitance of the PA varied enough with the instantaneous collector
> voltage to produce FM as well as AM. Do VHF airband rigs use
> collector modulation of the PA?
>
> 73 de
> John G3PAI

Believe it or not... most that I know of, do.

Residual FM can be a real issue especially in countries with aggressive
adjacent channel power specifications (Germany et. al.).  Actually, to
me, it is simpler to think of the issue as Phase Modulation, but the
result is the same.

You'd think that in this age of high-tech, we'd have moved on by now...

Bob Doyle (WA3TGF)


From [e-mail] Tue Aug 27 16:24:33 1996
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From: [e-mail] (John Seboldt)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Solid state AM -- collector modulated?
Date: Sun, 25 Aug 1996 17:33:25 -0600
Organization: Sporadic . . .
Lines: 27
Message-ID: <[e-mail]>
References: <4von0p$[e-mail]> <[e-mail]> <4vq4vu$[e-mail]>
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X-Newsreader: NewsWatcher 2.0
X-Stupid-Question: Why are you reading these header lines?

In article <4vq4vu$[e-mail]>, [e-mail] wrote:

> Yup.  Since aircraft VHF AM radio is where I've spent almost all my
> engineering career, the best way to do it is to amplify your
> modulating signal with an op-amp, sniff a little bit of the RF output,
> rectify it (detect it) and use this as the feedback signal to the op
> amp.  You couldn't care LESS what the modulating signal at the
> collectors looks like so long as the OUTPUT is a faithful reproduction
> of the input.
>
> Jim

Good idea...

So we have this feedback suggestion to linearize modulation, and also the
question of change in input/output impedances when re-biasing for Class C.

Big question:  if you run the MRF454 transistors at about 100 watts
carrier, can they take the peaks of current/voltage of 100% modulation?
(Of course, all other associated output components would have to handle
this also).

If not, maybe one should just be happy with the 30-some watts carrier
power of all-linear amplification if only occasional AM is contemplated?

John Seboldt K0JD
[e-mail]


From [e-mail] Tue Aug 27 16:24:34 1996
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From: Kevin Muenzler <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Solid state Mobile AMPS
Date: 23 Aug 1996 10:22:57 -0400
Organization: Yale CS Mail/News Gateway
Lines: 18
Sender: [e-mail]
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: babyblue.cs.yale.edu

[e-mail] (Mike Saville) writes:

-Has anyone built the HF Amp kit in Amateur radio trader from KD4YBC?
-I remember hearing someone use one but it has been a while since I have
-talked to someone using it. How do you like it? Which one, the 500W or
-the 1KW. Is it worth the money and do you have any problem with the car
-computer konking out? Anything to be concerned about?
-Mike W7CFL

Be very careful putting a big HF amp in your car.  I fried the computer
in my Saturn TWICE with a 500 watt amp on 40 meters.  The first time
the dealer replaced it under warranty.  The second time I told him that
it was probably my amplifier so I had to pay for it, big bux!
Most of the newer (95+) cars are pretty well protected against
RF but don't try it with any of the older ones.

Kevin, WB5RUE
[e-mail]


From [e-mail] Tue Aug 27 16:24:35 1996
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From: "Stephen Puskar" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: SOLVE THIS ONE PLEASE!!
Date: 25 Aug 1996 10:41:48 GMT
Organization: Concentric Internet Services
Lines: 7
Message-ID: <01bb9271$fd753fa0$[e-mail]>
NNTP-Posting-Host: cnc070031.concentric.net
X-Newsreader: Microsoft Internet News 4.70.1155

Is there anyway I can push a few more 100 feet broadcast range from a
Recoton 900 MHz wireless headphone transmitter/receiver? I live far enough
away from other hoses that it won't affect them yet I need the extra boost
because I'm getting drop offs and can't use the system effectively for what
I bought it for: to kill those long hours on the ridding
mower...Thanks..smp



From [e-mail] Tue Aug 27 16:24:36 1996
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From: Bruce KD1MW <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: sorry for screw up
Date: Sun, 25 Aug 1996 15:37:08 +0000
Organization: The Internet Connection
Lines: 2
Message-ID: <[e-mail]>
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Mime-Version: 1.0
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It was my mistake to list my Hardline connector want so many times.
Sorry,!!!  Bruce KD1MW..


From [e-mail] Tue Aug 27 16:24:37 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!fozzie.mercury.net!news.sprintlink.net!news-dc-9.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!tezcat!cam-news-hub1.bbnplanet.com!howland.erols.net!newsxfer2.itd.umich.edu!gatech!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: SPELLING PLEASE
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]> <[e-mail]> <4um163$[e-mail]>
Date: Sat, 17 Aug 1996 15:43:13 GMT
Lines: 44

In article <4um163$[e-mail]> [e-mail] (Bill Newkirk) writes:
>your history's defective. go back and read the mags in the libraries. study g
uides
>have been around probably "forever" and the FCC requiring public question
>pools is a fall out of the freedom of information acts...

That's right. Ameco and the ARRL had Q&A study guides in the 50s, and before.
There were also Q&A manuals for commercial license exams well before 1960.
The only difference with Bash was that his books tried to have actual word
for word questions from *current* exams rather than questions from expired
exams (which were freely available and used by the other publishers to prepare

their Q&A manuals).

Bash paid people who took the test to write down the questions and answers
from memory right after they left the exam session. (I think he paid something

like a dollar a question.) And he published updates frequently, unlike the
ARRL, who hardly ever revised their Q&A manuals.

The ARRL license manuals weren't exact word for word from current exams
because the ARRL didn't pay anyone to gather their material from exam
sessions. This made the Bash books more useful, and they cut into the
sales of ARRL License manuals. This caused a howl from Newington because
Bash was getting into their back pockets. When FOIA made the pools public,
and the VEC system started, Bash lost his competitive advantage, and couldn't
compete with a major publishing company like the ARRL (who were creating the
questions for the exams), so his books disappeared.

What made the Bash books useful was that the FCC only used 4 different
exams at any given time. That sharply limited the number of questions
whose answers needed to be learned. With the publication of the entire
question pools, and the ability to generate exams drawn from the pool
at random by computer as needed, the applicant now has to learn the
answers to all the questions in the pool instead of just the ones on
a limited set of exams in use.

The FAA went this route (publishing the question pool) with their pilot
written exams long before the FCC did. It makes the student learn more
material than just what may be on a particular exam.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | Due to provider problems
Destructive Testing Systems |    we break it.     | with previous uucp address
es
534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Tue Aug 27 16:24:38 1996
Path: news2.epix.net!news3.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news.preferred.com!usenet
From: [e-mail] (mschick)
Newsgroups: rec.radio.amateur.homebrew
Subject: UHF Micor modifications
Date: Wed, 21 Aug 1996 17:50:50 GMT
Organization: Preferred Internet News Server
Lines: 6
Message-ID: <4veebs$[e-mail]>
NNTP-Posting-Host: carter3.preferred.com
X-Newsreader: Forte Free Agent 1.0.82

Can anyone help me with the modifications needed for a Motorola MICOR
Model TA44RTA300AA to 9600/440MHz.  I've found several modifications
on the web, but they are not quite clear.  Please EMAIL direct.
Thanks and 73, Martin KA4IWG




From [e-mail] Tue Aug 27 16:24:39 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!news.compuserve.com!ix.netcom.com!news
From: [e-mail] (Leonard Nero)
Newsgroups: sci.electronics.components,sci.electronics.basics,rec.radio.amateur.homebrew
Subject: Re: What is a Gunn diode ?
Date: Fri, 23 Aug 1996 04:59:51 GMT
Organization: Netcom
Lines: 15
Message-ID: <[e-mail]>
References: <4vhlep$[e-mail]>
NNTP-Posting-Host: nyc-ny9-07.ix.netcom.com
X-NETCOM-Date: Fri Aug 23 12:00:23 AM CDT 1996
Xref: news2.epix.net sci.electronics.components:7002 sci.electronics.basics:7676 rec.radio.amateur.homebrew:16481


On 22 Aug 1996 12:56:57 GMT, [e-mail] (Marcin
Skubiszewski) wrote:

>The subject says it all.
>
>Is there a negative resistance region in these diodes, as in tunnel diodes ?

A Gunn Diode is a diode that is used to emit & detect waves in the
radar freq range... not sure about specs but i know you can get one
from one of those automatic Door companies that make doors for
shopping malls & the like... They might be called gunnplexers when
used in this way...

-Dan


From [e-mail] Tue Aug 27 16:24:40 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!netnews.fast.net!news.fast.net!netaxs.com!hunter.premier.net!news.cais.net!news.mathworks.com!wizard.pn.com!brighton.openmarket.com!decwrl!tribune.usask.ca!mongol.sasknet.sk.ca!canopus.cc.umanitoba.ca!news
From: [e-mail] (Tony Smith)
Newsgroups: sci.electronics.components,sci.electronics.basics,rec.radio.amateur.homebrew
Subject: Re: What is a Gunn diode ?
Date: 24 Aug 1996 23:03:32 GMT
Organization: The University of Manitoba
Lines: 10
Message-ID: <4vo1o4$[e-mail]>
References: <4vhlep$[e-mail]>
NNTP-Posting-Host: ts2m-12.mbnet.mb.ca
X-Newsreader: WinVN 0.92.6+
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In article <4vhlep$[e-mail]>, [e-mail] (Marcin Skubi
szewski) says:
>
>The subject says it all.
>
>Is there a negative resistance region in these diodes, as in tunnel diodes ?


Boy, talk about a loaded question!

(Sorry.)


From [e-mail] Tue Aug 27 16:24:41 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-pen-4.sprintlink.net!news.sprintlink.net!news-dc-10.sprintlink.net!news-dc.gsl.net!news.gsl.net!news-res.gsl.net!news.gsl.net!hunter.premier.net!newsfeed.direct.ca!nntp.teleport.com!ip-pdx04-55
From: [e-mail] (Roy Lewallen)
Newsgroups: sci.electronics.components,sci.electronics.basics,rec.radio.amateur.homebrew
Subject: Re: What is a Gunn diode ?
Date: Sun, 25 Aug 96 00:03:00 GMT
Organization: EZNEC Antenna Software
Lines: 17
Message-ID: <4vo55a$[e-mail]>
References: <4vhlep$[e-mail]> <4vo1o4$[e-mail]>
NNTP-Posting-Host: ip-pdx04-55.teleport.com
X-Newsreader: News Xpress Version 1.0 Beta #3
Xref: news2.epix.net sci.electronics.components:7031 sci.electronics.basics:7694 rec.radio.amateur.homebrew:16498

In article <4vo1o4$[e-mail]>,
   [e-mail] (Tony Smith) wrote:

>>Is there a negative resistance region in these diodes, as in tunnel
diodes ?
>
>
>Boy, talk about a loaded question!
>
>(Sorry.)

You can always count on some hotshot to shoot his mouth off.

-- Another pointed (and maybe even poignant) comment by

     Roy, W7EL



From [e-mail] Tue Aug 27 16:24:42 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-pen-4.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!demos!news.stealth.net!vixen.cso.uiuc.edu!howland.erols.net!news3.cac.psu.edu!news.math.psu.edu!ra.nrl.navy.mil!chaos-mac.nrl.navy.mil!user
From: [e-mail] (Douglas J. Mar)
Newsgroups: sci.electronics.components,sci.electronics.basics,rec.radio.amateur.homebrew
Subject: Re: What is a Gunn diode ?
Date: Mon, 26 Aug 1996 11:48:53 -0400
Organization: Naval Research Laboratory
Lines: 35
Message-ID: <[e-mail]>
References: <4vhlep$[e-mail]> <4vjfpn$[e-mail]>
NNTP-Posting-Host: chaos-mac.nrl.navy.mil
X-Newsreader: Yet Another NewsWatcher 2.0
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In article <4vjfpn$[e-mail]>, [e-mail]
(Steve J. Noll) wrote:

> [e-mail] (Marcin Skubiszewski) wrote:
>
> >The subject says it all.
>
> >Is there a negative resistance region in these diodes, as in tunnel diodes
?
>
>
> Yes.

Agreed.

Nitpick: the term should probably be "negative differential resistance" or
  "negative incremental resistance", for both Gunn and tunnel diodes, since
  the slope of the I-V curve is always positive.  The "negative resistance"
  region is that over which the resistance _decreases_ for increasing bias,
  but it still remains positive.  (It's possible to use active devices to
  construct a negative resistance (or impedance).

Gunn diodes are used in oscillators at microwave frequencies.


DM
+------------------------------------------------------------------------+
|  Douglas J. Mar                               [e-mail]  |
|  Materials Physics Branch, Code 6343          202-767-6244 (office)    |
|  Naval Research Laboratory                    202-767-6295 (lab)       |
|  4555 Overlook Avenue SW                      202-767-1697 (fax)       |
|  Washington DC 20375-5000                     Bldg 3, Room 409         |
+------------------------------------------------------------------------+
|  The views expressed above do not necessarily reflect those of U.S.    |
|  Government, the Department of Defense, the Navy, or my wife.          |
+------------------------------------------------------------------------+


From [e-mail] Tue Aug 27 16:24:44 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!EU.net!Austria.EU.net!01-newsfeed.univie.ac.at!02-newsfeed.univie.ac.at!newsfeed.uk.ibm.net!news-m01.ny.us.ibm.net!newsjunkie.ans.net!newsfeeds.ans.net!lantana.singnet.com.sg!ts900-4928
From: [e-mail] (Daniel Wee, 9V1ZV)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: where to find ultrasonic sensor
Date: Fri, 23 Aug 96 14:29:26 GMT
Organization: Singapore Telecom Internet Service
Lines: 33
Message-ID: <4vkf86$[e-mail]>
References: <01bb8598.fe59c5c0$fb99389d@DISCUS> <[e-mail]> <1996Aug20.193222.617@main03>
NNTP-Posting-Host: ts900-4928.singnet.com.sg
X-Newsreader: News Xpress Version 1.0 Beta #4

In article <1996Aug20.193222.617@main03>, [e-mail] (Joe Landis) wrote:
>>> for dumping into a laptop for some kind of spectral analysis. Anyone have
>>> recommendations for ultrasonic sensors? Different bat species use
>>> different frequencies, typically 40 kHz to 60 kHz, audio.
>>>
>>> BTW, I've seen some standalone commercial detectors for about $250 but
>>> it's no fun just buying one!
>>>
>>> Thanks, Tom KG6YJ

Try the following site. They are selling some good Polaroid units centred
around 50 kHz for about 16 dollars a piece and some other stuff. Of course
you will find cheaper units but they are different. These are more directional
compared to smaller units, and more sensitive. Any way check out the specs.

        http://cec.wustl.edu/~blw2/index.html

600 Series Instrument Grade Electrostatic Transducer:

The Assembly Comes Complete with Protective Cover
Minimum Transmitting Sensitivity @ 50 kHz: 110 dB
Minimum Receiving Sensitivity @ 50 kHz: -42 dB
Suggested DC Bias Voltage: 150 V
Suggested DC Driving Voltage (peak): 150 V
Operating Conditions:
Temperature: -20 to 160 deg F
Relative Humidity: 5%-95%

73 de 9V1ZV Daniel

 Daniel Wee | [e-mail]
 9V1ZV      | [e-mail]



From [e-mail] Tue Aug 27 16:24:45 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!metro.atlanta.com!cssun.mathcs.emory.edu!gatech!bloom-beacon.mit.edu!spool.mu.edu!howland.erols.net!newsfeed.internetmci.com!news.bctel.net!news.mag-net.com!ve7tcp.ampr.org!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Charles Curtis)
Newsgroups: rec.radio.amateur.homebrew
Subject: Why difficult to generate high power at UHF?
Date: 27 Aug 96 13:15:01 GMT
Organization: ucsd usenet gateway
Lines: 22
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

> Date: Sun, 25 Aug 96 23:32:47 GMT
> From: [e-mail] (Jim Gyer)
> Subject: Why difficult to generate high power at UHF?
>
> Yes there are tricks and there are other technologies, but for reasonable
> cost, power, weight you quickly have to make the compromise you see the
> commercial equipment coming to.  The good news is that less power is needed
at
> higher frequencies.  Don't think of antenna size in feet.  Think of it in
> wavelengths.  A given antenna area becomes a lot of wavelengths as frequency

> goes up resulting in more antenna gain.  Less power and more antenna gain
> results in the same radiated signal strength.

Less power and more antenna gain results in the same radiated
signal strength, but as frequency increases, path loss increases the
same amount that antenna gain increases (all other factors
being held constant, including coax loss).  So the *same*
power is required.

Chuck, N2UCN

amprnet: [e-mail]           internet: [e-mail]
ax25   : n2ucn@wa2soc.#nnj.nj.usa.na     internet: [e-mail]


From [e-mail] Tue Aug 27 16:24:46 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Gary Coffman)
Subject: Re: Wiring of TX/RX relay in transverter?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <4vc6fq$[e-mail]>
Date: Thu, 22 Aug 1996 16:07:23 GMT
Lines: 25

In article <4vc6fq$[e-mail]> [e-mail]
i-stuttgart.de () writes:
>Hi All,
>
>I am wondering which may be the best way to wire the TX/RX relay
>in a SHF transverter. I could wire the RX input to the NC contact,
>thus saving current on receive or I could wire the TX output to the
>NC contact and the RX to the NO contact, thus protecting the output
>transistors in case the relay fails to close.
>
>Any preferences? Moritz DL5UH

The latter method is better, and protects the receiver somewhat
from static buildup on the antenna or lightning surge. However,
beware, the capacitance between the NC and NO contacts may be
sufficient to couple enough Tx power into the Rx to damage it
at moderate to high power levels. You need to use two relays
and a sequencer to prevent that.

Gary

--
Gary Coffman KE4ZV          |    You make it,     | Due to provider problems
Destructive Testing Systems |    we break it.     | with previous uucp address
es
534 Shannon Way             |    Guaranteed!      | Email to [e-mail]
Lawrenceville, GA 30244     |                     |


From [e-mail] Tue Aug 27 16:24:47 1996
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From: Bruce KD1MW <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: WTB Hardline connectors
Date: Sun, 25 Aug 1996 10:54:55 +0000
Organization: The Internet Connection
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Hello all:       I am looking for "N" type hardline ends -HCC 78-50NM,
too fit a length of 1" hardline (flexwell) that I just picked up,
used.  The cable has lettered on it,  Cablewave Systems
16733-810929-00 HCC 78-50  TCC 650 972 FT Flexwell.  There is one
end on the line now with air valve and guage 0-5 PSI.  Please
advise, any help is appreciated.  Also what gas gets compresed in
this line?  Thanks, Bruce KD1MW  [e-mail]


From [e-mail] Tue Aug 27 16:24:48 1996
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From: Bruce KD1MW <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: WTB Hardline connectors
Date: Sun, 25 Aug 1996 12:29:56 +0000
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Hello all:       I am looking for "N" type hardline ends -HCC 78-50NM,
too fit a length of 1" hardline (flexwell) that I just picked up,
used.  The cable has lettered on it,  Cablewave Systems
16733-810929-00 HCC 78-50  TCC 650 972 FT Flexwell.  There is one
end on the line now with air valve and guage 0-5 PSI.  Please
advise, any help is appreciated.  Also what gas gets compressed in
this line?  Thanks, Bruce KD1MW  [e-mail]


From [e-mail] Tue Aug 27 16:24:49 1996
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From: Woody White <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WTB Hardline connectors
Date: Sun, 25 Aug 1996 21:09:26 -0700
Organization: AT&T WorldNet Services
Lines: 26
Message-ID: <[e-mail]>
References: <[e-mail]>
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Bruce KD1MW wrote:
>
> Hello all:       I am looking for "N" type hardline ends -HCC 78-50NM,
> too fit a length of 1" hardline (flexwell) that I just picked up,
> used.  The cable has lettered on it,  Cablewave Systems
> 16733-810929-00 HCC 78-50  TCC 650 972 FT Flexwell.  There is one
> end on the line now with air valve and guage 0-5 PSI.  Please
> advise, any help is appreciated.  Also what gas gets compressed in
> this line?  Thanks, Bruce KD1MW  [e-mail]

Ever consider making your own?  I like Hline for its' low loss, but
have a limited budget.  Given that, I scrounge 1/2 and 7/8 inch 70 ohm
catv cable.  If you sweet-talk 'em many cable companies will give you
the (relatively) short ends from a spool.  The scrap man was gonna get
'em anyway...   I use copper pipe, telescoping hobby shop brass tubing,
hose clamps (split copper/brass to clamp on Hline od), and a dose of
coax seal.  Cover the entire mess with Scotch Super 33+ tape (never
use the cheap stuff - bad investment) and have a $5 or so end on the
cable.
73,
--
de  Woody (WB4QXE) -  [e-mail]
Electron Microscopist/Microanalysist,
Ham radio "homebrewer", shade tree mechanic,
'90 Nissan 240SX, wish still had my Mcycle too!
.


From [e-mail] Tue Aug 27 16:24:50 1996
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From: [e-mail] (Eric Haskell)
Newsgroups: rec.radio.amateur.homebrew
Subject: WTB: Dead KDK2033 2M X-ceiver
Date: Sat, 24 Aug 1996 02:33:10 GMT
Organization: INTERNET AMERICA
Lines: 6
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Reply-To: [e-mail]
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X-Newsreader: Forte Agent .99d/32.182

I fried the u-controller in my KDK2033. Any body have dead unit with a
working controller for sale cheep? Please specify condition and price?
Eric Haskell
KC4YOE
[e-mail]



From [e-mail] Mon Sep 02 06:52:47 1996
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From: Carl Osborn <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Zener Diode For Heathkit
Date: Sun, 25 Aug 1996 19:39:18 -0700
Organization: Osborn Laboratories
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Where can I get a 8.2 volt 1.5 amp zener diode for my Heathkit SB230
linear amplifier? It is a Motorola type 1N280 GA or possibly 1N2806 A
(it is hard to read part no. in instruction book). Any help would be
appreciated.

                 Carl W6RXP


From [e-mail] Mon Sep 02 06:52:48 1996
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From: Jake Brodsky <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: What is a Gunn diode ?
Date: Mon, 26 Aug 1996 12:02:48 -0700
Organization: Wheeeeee!
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References: <4vhlep$[e-mail]>
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To: Marcin Skubiszewski <[e-mail]>

Yeah, a Gunn diode is a sort of cousin to the tunnel diodes.  There
are substantial differences, though.  Basically, you stick them in
a resonant microwave cavity, apply a voltage within a certain range
and they oscillate.
--
Jake Brodsky, mailto:[e-mail]
PP-ASEL-IA, Cessna Cardinal N30946, Based @ MD24
Amateur Radio Station AB3A
"Beware of the massive impossible!"


From [e-mail] Mon Sep 02 06:52:49 1996
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From: fiz <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Bandwidth of a 14.4 modem?
Date: Mon, 26 Aug 1996 13:33:10 -0700
Organization: Colorado State University, Fort Collins, CO  80523
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Hi,

Does anyone know how much bandwidth a 14.4K modem would take up?

ttfn fiz (KG0YG)


From [e-mail] Mon Sep 02 06:52:50 1996
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From: Mark Brown <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: 4cx800a on 2 meters
Date: Mon, 26 Aug 1996 16:01:59 -0700
Organization: StarNet Communications, Inc
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Hi all
     Has anybody seen or built a 2 meter linear using the Svetlana
4cx800a. I am looking for any info you might have on using this tube at 2
meters.
     Thanks
     Mark


From [e-mail] Mon Sep 02 06:52:51 1996
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From: [e-mail] (Steve Kennedy)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: Whatever happened to AC-SSB ??
Date: Mon, 26 Aug 1996 20:45:57 GMT
Organization: Teleport - Portland's Public Access [phone]
Lines: 10
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ACSB (new acronym, same system) was resurrected in the mid 80's by
Stephens Engineering Associates (SEA), a manufacturer of radio
equipment (known primarily for their marine band stuff).

I don't know what happened to it, just that they were working on it in
the 80's!

Steve
WB7PSD



From [e-mail] Mon Sep 02 06:52:52 1996
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From: [e-mail] (Bill Sohl)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.antenna
Subject: Re: CORRECTION - FCC Ruling Will Require Some Hams to File Environmental Impact Reports
Date: Tue, 27 Aug 1996 01:07:28 GMT
Organization: Mount Olive Township (NJ) Emergency Management
Lines: 41
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[e-mail] (Gary Coffman) wrote:

>A final note. The standard requires exposures to be averaged
>over a 6 minute period for operators, or a 30 minute period
>for the general public (whose standard exposure levels are
>lesser than for operators). So a station whose peak exposures
>violate the standard may still be Ok if the average exposure
>level is sufficiently lower than the peak. Again this is a
>somewhat *political* decision and doesn't mean it is safe.

Wouldn't a typical case for an amateur set-up be one in which
the result is at least divided by two as a result of the typical
amateur QSO being a 2 way communication with an average
duty cycle being 50%?

Additionally, for general public exposure, it would seem that
most situations would result in even lower exposure levels
because of movement by the "public" through an area
as opposed to sitting in one place.  Granted there may be
some exceptions to that, but I can't think of any at the
moment.

In another post, Clay N4AOX said:
> Hmmm, based on what you say, it seems that other thinkgs being equal a
>low duty cycle mode like Morse OOK CW would be provide a lower exposure
>to operators and the public when averaged over the same amount of time
>than say an FSK mode. In other words Morse code, among other positive
>attributes is more healthy than some of the newer fad modes.  ;-)

That too would improve (i.e. leesen an otherwise high or excessive
value that might be generated by calculation).  As Clay notes,
CW is not a continuous transmission, so a duty cycle for transmit
only can probably be fairly easy to calculate.  On that same
basis, SSB transmissions do not contain the Peak levels
except at certain speech patterns, so some average value
or correction factor would be helpful when calculating SSB
averages.

Bill Sohl  K2UNK
ARRL Local Gov't Liaison, Mt. Olive Township, NJ



From [e-mail] Mon Sep 02 06:52:53 1996
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From: Steve Ickes <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Modern digital versus SSB and Morse (was Re: Commercial CW use)
Date: Tue, 27 Aug 1996 01:29:37 -0700
Organization: Erol's Internet Service
Lines: 50
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References: <4viv8o$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
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Jim Conn wrote:
>
> Gary Coffman wrote:
> >  <<<Mucho stuff cut>>>
>
> I do believe you missed my entire point.  Ham radio is more than RTTY,
> or ATV or SSB or CW.  It is all of the above.  Because a large number of
> hams use CW, it should be included in the testing, in my opinion.
>
> I stand by my argument about the HF bands.  I'll offer one more argument.
> If the HF bands are such a valuable resource for high speed
> communications, why isn't the FCC planning to auction HF spectrum?
>
> Could it be that commercial interests know that you don't get enough
> bang for the buck on HF?  Foreign broadcast encroachment is our greatest
> threat for our HF bands, not commercial high speed digital services.

        This is patently untrue.  More and more commercial service are
looking at and beginning to use or reuse HF as a lower cost alternative
to satellite links.  Adavanced HF coms functionality like ALE, burst
modems, and FH/SS allow more reliable, higher data rate coms than in the
past.  Even with all this technology, the cost is often cheaper than the
satellite route.

Don't be to sure the HF spectrum is safe from commercial interests.


>
> No doubt there are many foreign hams who are affluent enough to purchase
> fancy ham gear of all types, but I have communicated with many who are
> operating homemade gear, both receiver and transmitter.  Others were
> using converted military or commercial surplus.
>
> 73,
>
> Jim

        Whether or not the CW requirements should be removed, I believe
more digital comms questions should be on the test.  That is, if your
license class allows you to use a mode (digital or otherwise) you should
have to answer questions on it.

It's been a while since I took the tests but I don't recall questions on
any modes, except CW,FM,SSB on the tests up thru Advanced.  As I recall,
most of the "advanced" modes were covered in the Extra class exam.  This
does not mak sense to me.  I'm allowed to run packet, ATV, SSTV, and RTTY
and I don't have to have any knowledge of them??  Is this still the
case??

S


From [e-mail] Mon Sep 02 06:52:54 1996
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From: [e-mail] (Bill Nelson)
Newsgroups: rec.antiques.radio+phono,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.space,rec.radio.cb,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap,rec.video.satellite.dbs,rec.video.satellite.europe,rec.video.satellite.misc,rec.video.satellite.tvro
Subject: Re: SAMS Needs Your Electronics URLs
Followup-To: rec.antiques.radio+phono,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.space,rec.radio.cb,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap,rec.video.satellite.dbs,rec.video.satellite.europe,rec.video.satellite.misc,rec.video.satellite.tvro
Date: 27 Aug 1996 04:40:08 GMT
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Gregg ([e-mail]) wrote:
: >
: >After deciphering "If you can read this, you really ought to get out
: >more," I decided the effort greatly outweighed the rewards!

: Jeff, you're using the built-in newsreader in the Netcruiser software.
: It's crap.  Try using Free Agent -- and, if you like it, you can buy
: Agent -- and you can do ROT13 with a couple of mouse clicks.  Much
: more importantly, you can also do most of your Usenet news stuff
: offline.

Or, if you use 'tin' as the newsreader, you can do so by simply pressing
a lower case d key while in read mode.

Bill


From [e-mail] Mon Sep 02 06:52:55 1996
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From: [e-mail] (Mark Fraser)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: where to find ultrasonic sensor
Date: 27 Aug 1996 05:44:02 GMT
Organization: Wimsey Information Services
Lines: 11
Message-ID: <4vu1v2$[e-mail]>
References: <01bb8598.fe59c5c0$fb99389d@DISCUS> <[e-mail]> <1996Aug20.193222.617@main03> <4vkf86$[e-mail]> <[e-mail]> <4vtbpm$[e-mail]>
NNTP-Posting-Host: vanbc.wimsey.com
X-Newsreader: TIN [version 1.2 PL2]

I acquired four ultrasonic motion detectors that look unused. c/w instruciton
sheets - how about $25+shipping for the lot?

/mark


Bob Winingham ([e-mail]) wrote:
: Old X10 light control base units had an ultrasonic sensor
: for use with remotes.




From [e-mail] Mon Sep 02 06:52:55 1996
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From: Mark <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Bandwidth of a 14.4 modem?
Date: Tue, 27 Aug 1996 06:01:42 -0500
Organization: Purdue University
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fiz wrote:

>
> Does anyone know how much bandwidth a 14.4K modem would take up?

The bandwidth of a standard phone line is only 3Khz, so it can't
be more than that.

Mark
<KB9KHM>


From [e-mail] Mon Sep 02 06:52:58 1996
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From: "Ian White, G3SEK" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 4CX250B as GG TRIODE amp ???
Date: Tue, 27 Aug 1996 08:41:11 +0100
Organization: IFW Technical Services
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References: <[e-mail]>
 <4vtqht$[e-mail]>
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W8JI  Tom wrote:
>In article <[e-mail]>, [e-mail]
>(Chris Scott) writes:
>
>>Anyone done this?
>>
>>WB9NEQ
>
>The contrl grid of the 250 is too fragile, and grid spacings are not
>correct for zero bias GG operation. You can use the tube cathode driven,
>but will still need screen and bias voltages.
>
>The screen must be very well regulated, or IMD will be unpredictable.
>
>Three or four hundred ohms of grid swamping is too high, unless you plan
>on driving the tubes with less than a few watts.

Agreed - it's a tube-killer and the intermodulation is severe.

Any tetrode can be used with cathode drive and both grids grounded to
RF, but only if the correct bias voltages are applied to both grids.
Older tetrodes with control grids rated for Class-C operation will
survive with both grids directly grounded, but modern tetrodes such as
the 4CX series will not.

See my article on exactly this subject in the September issue of
'Radio Communication' (RSGB).


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


From [e-mail] Mon Sep 02 06:53:00 1996
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From: Douglas Dwyer <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Worked any xmtr-to-skull lately?
Date: Tue, 27 Aug 1996 10:25:01 +0100
Organization: FP
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In article <4vqesf$[e-mail]>, raven1
<[e-mail]> writes
>This isn't a joke.  If anyone has tried this or is
>willing to try it, I would like to correspond about
>this amazing technology.  It is apparently patented
>and therefore likely works.
Not always true.

---------I have seen your posts elsewhere relating to your personal
experiences, it is not friendly to send so much text, however  .--------
---
If you stand too close to a functioning radar antenna you will hear a
buzzing, this is because of the instentaneous heating of the brain by RF
that generates tiny shock waves due to slight thermal expansion, the
shockwaves are picked up as sound in the inner ear. This could be the
mechanism employed, would not be of use if the auditry cortex was not
functioning.
Ps dont stand too near! or dont try this at home as they say on the kids
programmes.
There is also documentry evidence that carefully directed varying
magnetic fields can affect mood and vision, the effect must  be small as
the fields employed with PET scans are enormous and I have not heard
that patients mention any ill effects.

Regards
Douglas Dwyer
Frequency Precision Ltd
Shorts Northlew Okehampton Devon UK EX20 3NR
Consultant and Designer for Analog, RF, Crystal Oscillators,
TCXOs, OCXOs, SAWOs, Sensors.
Phone/Fax [phone]
Web page http://ourworld.compuserve.com/homepages/frequency_Precision/



From [e-mail] Mon Sep 02 06:53:01 1996
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From: fiz <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: External antenna for radio?
Date: Tue, 27 Aug 1996 10:30:31 -0700
Organization: Colorado State University, Fort Collins, CO  80523
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Hi,
I've got a small Rat Shack radio (AM/FM) in the lab here with a
telescoping whip antenna. Unfortunately, I'm back in a corner, on the
bottom floor, or a steel structure building and have horrible reception
on the very few stations I can get. Does anyone have any ideas on how to
hook up an antenna (a longwire variety) to this radio that I can toss out
the window, without having to make major alterations to the radio itself.
I'm considering simply opening the case and soldering a wire onto the
place where the whip is attached. I would rather have some type of
antenna which would couple to the whip without being permanently
attached.
ttfn  fiz (KG0YG)


From [e-mail] Mon Sep 02 06:53:02 1996
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From: Paolo Tealdi <[e-mail]>
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.space,rec.radio.amateur.scanner,rec.radio.amateur.shortwave,rec.radio.amateur.swap
Subject: Portable VHF mark ALINCO model DJ180E
Date: Tue, 27 Aug 1996 10:32:14 +0200
Organization: Politecnico di Torino (Italy)
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A friend of mine is a radio amateur and he has got this transceiver
radio:
        RTX mark ALINCO
        ELECTRONICS INC. JAPAN
        Portable VHF
        model DJ180E

He has got two questions about this radio:
1) How can he modify his radio to extend the band from 144/146 MHz to
130/170 MHz?
2) Can he receive the "manual for use" of this radio? (A photocopy of
the manual is acceptable too!)

For details, please conctact me through my personal e-mail address.
Thank you very much!

Paolo Tealdi - Italy
E-mail: [e-mail]
WWW: http://www.polito.it/~s76511/index.html


From [e-mail] Mon Sep 02 06:53:05 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Rob Janssen)
Subject: Re: Why difficult to generate high power at UHF?
X-Newsreader: NN version 6.5.0 (NOV)
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Organization: PE1CHL
Message-ID: <[e-mail]>
References: <4rg6p0$[e-mail]> <[e-mail]> <4vqnqv$[e-mail]>
Date: Tue, 27 Aug 1996 11:06:26 GMT
Lines: 25

In <4vqnqv$[e-mail]> [e-mail] (Jim Gyer) writes:

>Yes there are tricks and there are other technologies, but for reasonable
>cost, power, weight you quickly have to make the compromise you see the
>commercial equipment coming to.  The good news is that less power is needed a
t
>higher frequencies.  Don't think of antenna size in feet.  Think of it in
>wavelengths.  A given antenna area becomes a lot of wavelengths as frequency
>goes up resulting in more antenna gain.  Less power and more antenna gain
>results in the same radiated signal strength.

But the path loss increases with frequency, causing you to need more
antenna gain to have the same received signal strength.
It is better to think of antenna size in feet (or metres if you live
outside the USA): the expected performance of the system as a whole is
much more related to the physical size of the antenna than to the
impressive gain figures that you might see at high frequencies.
For comparison, you can calculate a figure called "capture area" for
antennas of different types and frequencies, and compare the results
based on that figure.

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


From [e-mail] Mon Sep 02 06:53:06 1996
From: [e-mail] (Kevin  AstirCS "1U"   KO0B)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Zener Diode For Heathkit
Date: Tue, 27 Aug 1996 13:01:23 -0700 (PDT)
Organization: Aquila Technologies Group, Inc.
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Carl Osborn <[e-mail]> wrote:

>Where can I get a 8.2 volt 1.5 amp zener diode for my Heathkit SB230
>linear amplifier?

1.5 A, or Watts?

If  really amps, then big problem is power dissipation (12 + W).

You could use a NPN power transistor. Connect  the collector where
cathode  (stripe) went, emitter where anode went.  Now connect a ~7.5V
(*), 1  or 1/2 W zener from collector (cathode) to base (anode). thus:

                       |
                       |
    -  ->Z-------|
    |                  |
    |               /
    ---------- |
                  |\
                     \>
                        |



voila! a high power zener.  Current through zener is reduced by beta
of the transistor... at least 25 for most NPN power transistors, so
1/2 Zener device is fine, the transistor does all the hard work, so
heat sink it .

Alternativly, you could go the " Vbe multiplier" route.  Replace that
zener with 1K ohm  1/2 or 1 watt resistor.  Add 50 ohm pot + 67 ohm
fixed (1/4 W OK) from base to emitter.  Adjust pot to obtain 8.2 V.
This will drift more with temperature (lower voltage  with more heat)
than "zener booster"  will.

Both solutions use parts available at Radio Shack. (though you might
need to series some zeners to get 7.5 V)

-KF-

* 7.5V = ~ (8.2V - Vbe)







From [e-mail] Mon Sep 02 06:53:07 1996
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From: [e-mail] (Stephen Muther)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: is anybody there using Rabbit for ATV TRX ?
Date: 27 Aug 1996 13:34:43 -0700
Organization: BEST Internet Communications
Lines: 19
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In article <[e-mail]>,
Howard Sherer <[e-mail]> wrote:
>Matt,
>I just saw your post. I have a rabbit rx/tx that I am not using. Are you
>telling me that they can be used for ATV? I was going to sell the set up
>for $60. are they worth it and is there a market for threm?
>
>Regards, Howard AE3T

There are some newer products which are on 2.4GHz and use FM video
modulation.  I had a chance to play with one (sorry I don't remember
the brand) and discovered they work quite well.  They use standard
NTSC pre-emphasis and a 4.5MHz audio subcarrier.  You could Hot-Rod
them by adding a preamp to the RX and a power stage to the TX to
make a very good quality video link system.

Steve M.
WF6R



From [e-mail] Mon Sep 02 06:53:08 1996
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From: John Nelson <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: Modern digital versus SSB and Morse (was Re: Commercial CW use)
Date: Tue, 27 Aug 1996 14:05:52 -0800
Organization: Evergreen Computer Services
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Zack Widup wrote:

> So for those who wish to see how many novels per hour they can send via
> CLOVER, well - have fun. I still enjoy reading about your results. But I
> still like those slower forms of communication, CW and speech. They are
> also fun in this hobby, to me at least. And to a few others ... I've had
> several one-hour CW and SSB ragchews recently.
>

Sorry Zack, but for the privilege of using CW and speech, you must
demonstrate proficiency in the setup and use of CLOVER? What? You say you'll
never use it? Doesn't matter, for it is the one true "mode that get's through
when nothing else will".

Do try to get the point here. Most of us "un-washed no-coders" agree with you
that CW use may be entertaining, charming, even useful, but we are NOT
forcing you to demonstrate proficiency in something ELSE to use it.


From [e-mail] Mon Sep 02 06:53:09 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Order!! Please!
Date: 27 Aug 96 16:51:17 GMT
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Folks:
        The last time I looked this group is the Homebrew group whose
focus is on *building* amateur radio equipment (with an occasional
polite interuption by those who don't know better).  All of the CW vs
No-code vs Digital modes *does* have a place: it's called ham-policy.
I am, in fact, interested in this discussion, but this is the *wrong*
forum!

Could we *please* get back to building radios?

Ray Mack
WD5IFS
[e-mail]



From [e-mail] Mon Sep 02 06:53:10 1996
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From: [e-mail] (Rob Frohne)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: Whatever happened to AC-SSB ??
Date: Tue, 27 Aug 1996 21:20:44 -0700
Organization: Walla Walla College
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A couple of my engineering students and I picked up the frequency
companding idea and implemented it on the TI DSK DSP evaluation board.  It
was written up
in QEX a while back.  The editors allowed me to put a copy on my web page.  Yo
u
can see it at http://www.wwc.edu/~frohro/qex/qex-art.html.  We didn't implemen
t
the amplitude compandor, but that could be added in.  Our testing indicated th
at
it was a feasible system, but I doubt it will ever catch on, as there are bett
er
ways of reducing the spectrum with DSP.

--
Rob Frohne
E.F. Cross School of Engineering
Walla Walla College
204 S. College Ave.
College Place, WA 99324

[e-mail]
http://www.wwc.edu/~frohro


From [e-mail] Mon Sep 02 06:53:11 1996
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From: Peter Michael Lancellotti <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Looking for a Marti type wide band repeater
Date: Tue, 27 Aug 1996 23:35:49 -0400
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From [e-mail] Mon Sep 02 06:53:12 1996
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From: [e-mail] (Steven Kerns)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: celluler phone to 900Mhz
Date: 28 Aug 1996 01:00:01 GMT
Organization: Penn Biomedical Support, Inc.
Lines: 22
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Message-ID: <5005mh$[e-mail]>
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Gary,

One problem I have run into with surplus cellular gear is that the
PA brick will not operate much high in frequency than it is designed
to.  Some are quite wide but I have played with others that drop off
before 900 mhz...  Just a somthing to think about

Steven Kerns N3FTI
[e-mail]
Penn Biomedical Support, Inc.

In article <[e-mail]>,
[e-mail] says...
>
>Any suggestions on how to convert a Uniden CP 2000 cellular phone
>to 900 Mhz. Namely I need Programming info, and RF modification info.
>
>Can anbody help me?
>
>Gary Tait , VE3VBF
>



From [e-mail] Mon Sep 02 06:53:12 1996
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From: [e-mail] (richard smith)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ham-Homebrew Digest V96 #363
Date: 28 Aug 96 01:21:39 GMT
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unsubscribe




From [e-mail] Mon Sep 02 06:53:14 1996
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From: [e-mail] (Dan Finn)
Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc,rec.radio.amateur.antenna
Subject: Re: CORRECTION - RF Calculation
Date: Wed, 28 Aug 1996 03:35:26 GMT
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[e-mail] wrote:


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

>> For example, the Rrad of a dipole is roughly 50 ohms (would be 73 ohms
>> in free space). At 100 watts, that gives a feedpoint current of 1.414
>> amperes. The magnetic field declines inversely with distance in the
>> near field (not the inverse square as is the case for power). So 1.414/0.16
3
>> = 8.67 meters. That's the near field safe distance from the current node
>> in the antenna for the controlled magnetic field exposure. For the
>> uncontrolled exposure, the minimum safe distance is 19.8 meters. Similarly,

>> for the electric field, the safe distances are the same, but from the
>> antenna voltage nodes (the ends for a dipole) instead of the feedpoint.


>I made an error here. I forgot to include the factor of 2*pi in the
>above figures. That reduces the safe distance for controlled exposure
>to just 1.38 meters, and for uncontrolled exposures to 3.15 meters.
>That's much better.

Although the FCC report and order says nothing about the near field
problem when calculating HF limits, IEEE C95.1 1991 says in a 'note'
to the tables for controlled and uncontrolled that the MPE is the rms
E and H limits given in the tables. Thus, IEEE C95.1 1991 essentially
tells you to use the far field values. In the case of your isotropic
example that uses 100W ERP, E= 1842/f or 61.4V/m and H=16.3/f or
54A/m for controlled exposures. This yields a radius of .89m for E
and .27m for H (whether near or far field). For uncontrolled, E
=823.8/f=27.46 V/m and H=the same as for contolled = .54A/m.
This yields radii of 2m for E field in uncontrolled and the same .27m
for H in uncontrolled.

Note that when doing the power density calculation, f**2 should be
used, not "f". When calculating power density for the 3-30MHz range,
the power density is the same E field 1mW/cm**2 mentioned on the ARRL
website. The H field power density limit is 10000/f**2 or
11.11mW/cm**2 for controlled and uncontrolled. You will obtain the
same radii for E and H using the "S" for E and H (power densities)
column as you do when using the E and H field columns in all cases.

Using the isotropic antenna at 100W ERP, the standard tells you to
stay .89m away from the isotropic antenna in controlled environments
and 2m away from uncontrolled environments. With a real dipole type of
antenna, the hotspots will be the feedpoint (H field) and the
endpoints (E field). Theoreticaly, the distances should not exceed the
worse case example of the isotropic antenna. When adjusting for 1000W
ERP, the radii do not increase by 10 because it is a SQRT
relationship, so the distances are not as high as one might initially
think.

Although the calculation is easiest to make on an isotropic antenna,
I have not been able to find or build a good one ;)

73

KR4AJ



From [e-mail] Mon Sep 02 06:53:16 1996
Newsgroups: rec.radio.amateur.homebrew
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From: Tovar <[e-mail]>
Subject: Homebrewing for the less-than-affluent (was: "Commercial CW use")
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Gary Coffman wrote:
>
> If you look at the pictures of foreign stations in QST and CQ, you'll
> see the same sort of Japanese transceivers found in most US amteurs'
> stations. It is rare indeed to see a homemade station, and when you
> do, it usually turns out to be quite elaborate (read expensive). That's
> because most foreign amateurs, just as most US amateurs, only homebrew
> because they *want to*, and not because they have to. It usually isn't
> cheaper to build a quality station than it is to buy one.
>
> Some amateurs in the US and elsewhere *choose* to build and operate
> cheap CW stations of marginal performance, but in almost every case
> it *is* a choice, and not done by necessity. Homebrewing is great.
> It is fun and educational. But it isn't a viable route for those
> in dire poverty to enter amateur radio, even if they had the leisure
> time to do so (which they almost certainly do not).

I am painfully aware of this right now.  It seems that you need access
to test equipment if you're going to do much more than the simplest QRP
rig, which seems to make it out of the question for a no-code tech.
I've
built my own packet modem, battery charger (switchable between NiCd and
gel-cells), two logic probes, numerous attempts at dual-band antennae
(with a fixed-station winner described to me over the air by WA6TVM, and
my preferred mobile described over coffee by N6FRI), two headset mikes,
a 2 meter "tin can" filter, various other projects which don't work well
enough to mention, and homebrew AX.25 and APRS software.  Maybe i could
build a Ramsey transciever or a Hamtronics receiver/exciter, but without
an elmer with a scope and/or spectrum analyzer, the most that i can do
in the RF realm that i could use would something like a 10 meter
receiver
for RS10/11.  Otherwise, i have no way of knowing if i'm complying with
Part 97.  I've looked on the WWW at (but not asked about) local clubs
for folks who could help me get started in RF, but so far i haven't seen
anything encouraging yet.  I guess i'll have to ask around on the local
nets.  Otherwise, i first major project might have to be a scope built
out of TTL and one of the new fast ADC chips.  (That would be *much*
easier for me to design than a simple QRP rig, especially if i dig up
a wirewrap gun somewhere and since a recent review of the Radio Shack
$99 digital scope was so discouraging.)

So, you're very right Gary [as is usually the case], that it isn't the
way to get into ham radio, unless someone nearby has the time and equip-
ment to do alot of elmering, like in the old days. When i first tried to
get my license 30+ years ago, that was definitely a way to go.  But i'm
afraid that went the way of the vacuum tube AM radio.  Fortunately, i
could afford a decent HT at the time i finally got my license. But since
then, other things have been more important than a well-paying job (such
as burnout and avoiding the stress of such a job) and so now i have too
many deferred expenditures to consider throwing money at the problem.
I could probably be on the air with HF packet/RTTY in a matter of a few
days but that's not a choice that i have.

So what are my options?  Is there much that one can do in the RF realm
without a lot of money or learning CW first?  [And, though i continue to
try, CW advocates should take note of a mild head injury that has
affected
my short-term memory, my hardwriting under stress, and causes me to make
strange typos and mix words up.  That, at best, makes that even more
difficult than when i was  of the age that learning foreign languages is
considered easy.]  I have many ideas to explore higher speed packet, and
the software and digital experience to make it work, but without money
or
bench access, it seems like there's not a lot that i can do.  I sure
hope
i'm wrong and someone like KE4ZV can straighten me out on this!

                        -- KD6PAG (networking old-timer, RF newbie)

P.S.  Speaking of which, anyone got a 29 MHz VXO design that'll vary 40
and 100 KHz that i could use with a miniR2 (or a better approach)?


From [e-mail] Mon Sep 02 06:53:17 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!holonet!colossus.holonet.net!marks
From: [e-mail] ([e-mail])
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,uk.radio.amateur
Subject: Pulse-Amplitude Modulation?
Date: 28 Aug 1996 06:23:47 GMT
Organization: HoloNet National Internet Access System: 510-704-1058/modem
Lines: 8
Message-ID: <500olj$[e-mail]>
NNTP-Posting-Host: giskard.holonet.net
X-Newsreader: TIN [version 1.2 PL2]
Xref: news2.epix.net rec.radio.amateur.misc:106243 rec.radio.amateur.equipment:31977 rec.radio.amateur.homebrew:16570 uk.radio.amateur:15417

Does anyone have any experience with pulse-amplitude modulation?

If so, please e-mail me.

Thanks,

    -Dale          KA5EVK



From [e-mail] Mon Sep 02 06:53:18 1996
Path: news2.epix.net!news3.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news.xensei.com!news.miracle.net!wariat.org!news.apk.net!news
From: Steve Wolf <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Source for 0.05 Ohm Resistors?
Date: Wed, 28 Aug 1996 08:04:12 -0400
Organization: The Wolf Family
Lines: 19
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: pm8-6.apk.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0 (Win95; I)

Steve Wolf wrote:
>
> I need to replace the 0.05 ohm 5% 5 watt resistors in my Astron RS35M.
> Astron will supply them, $1/resistor plus shipping plus the phone call
> but they don't take a credit card.
>
> I've checked Digi-Key, Mouser and RF Parts and I can't find the .05.
>
> Does anyone have a 1-800 source for such a resistor?

Trying rec.radio.amateur.homebrew as the post to equipment resulted in
nothing but blank stares.

--
73,
Steve
        Internet:  [e-mail]
        Amateur Radio:  no8m@no8m.#neoh.oh.usa.na
        MSYS Mail List:  [e-mail] ('info' for title)


From [e-mail] Mon Sep 02 06:53:20 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!fozzie.mercury.net!news.sprintlink.net!news-dc-9.sprintlink.net!tezcat!cam-news-hub1.bbnplanet.com!howland.erols.net!newsfeed.internetmci.com!in2.uu.net!news1.gte.net!usenet
From: Jim Conn <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: Modern digital versus SSB and Morse (was Re: Commercial CW use)
Date: Wed, 28 Aug 1996 09:29:39 -0700
Organization: GTE Intelligent Network Services, GTE INS
Lines: 30
Message-ID: <[e-mail]>
References: <[e-mail]> <4viv8o$[e-mail]> <[e-mail]> <[e-mail]> <4vuu68$[e-mail]> <500f9k$[e-mail]>
NNTP-Posting-Host: clw98049.gte.net
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[e-mail] wrote:
>
> Fine ... multiplex your "CW" bits in with the others and rag-chew all
> you want ... just don't force me to do it ... I'd rather use my bits in
> other ways.
>
> If we don't use our spectrum more efficiently, we'll lose it to those
> who will invent more efficient, productive used for it.
>
> Carl - wa6vse
> [e-mail]

Last time I checked, no one is forcing anyone to USE CW - just learn
it.  I stand by my original opinion that Amateur testing should
encompass the hobby from A to Z.  That means that RTTY, CLOVER, PACTOR,
and CW all should be included, even if perhaps the former have a
smaller following than CW.

Besides, the VHF and UHF bands, were CW is less frequently used, are
the ones being threatened, not the HF bands.  I don't consider the
threat to the VHF & UHF areas to be a valid argument against CW
testing, since those areas are already open to those with a no-code
license.


73,

Jim - AD4VL




From [e-mail] Mon Sep 02 06:53:21 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!tezcat!cam-news-hub1.bbnplanet.com!howland.erols.net!newsfeed.internetmci.com!metro.atlanta.com!news.radio.org!ka4ybr.netmha.com!not-for-mail
From: [e-mail] (Bob Duckworth)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: Modern digital versus SSB and Morse (was Re: Commercial CW use)
Date: 28 Aug 1996 10:54:34 -0400
Organization: Mark Horton Associates
Lines: 16
Message-ID: <501mja$[e-mail]>
References: <[e-mail]> <[e-mail]> <4vuu68$[e-mail]> <[e-mail]>
NNTP-Posting-Host: ka4ybr.netmha.com
Xref: news2.epix.net rec.radio.amateur.homebrew:16550 rec.radio.amateur.misc:106204

As a gate, CW/morse, is as universally fair(or unfair) as one can get.

But, if one agrees that some sort of gate is needed then what better
than morse. There is even a work around in place for those who can not
learn it.

IMHO ones respect for a priviledge is proportional to the work required
to obtain it.


-bob
--
Bob Duckworth Consulting, 960 Ralph McGill Blvd. Atlanta GA 30306-4447
bobs' address is [e-mail]    404-888-0389(V) 892-2301(FAX)
Buy Sell Trade Surplus Computer Electronics Datacom Telecom since 1981.
Fax or email your list for a fast cash offer. Watch for listserv catalog.


From [e-mail] Mon Sep 02 06:53:23 1996
Path: news2.epix.net!news3.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!inet-nntp-gw-1.us.oracle.com!news
From: Ted Alexander <[e-mail]>
Newsgroups: rec.antiques.radio+phono,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.space,rec.radio.cb,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap,rec.video.satellite.dbs,rec.video.satellite.europe,rec.video.satellite.misc,rec.video.satellite.tvro
Subject: Re: SAMS Needs Your Electronics URLs
Date: Wed, 28 Aug 1996 12:26:38 -0400
Organization: Oracle Canada
Lines: 41
Message-ID: <[e-mail]>
References: <4varvc$[e-mail]> <4vcg3p$[e-mail]> <321a927c.1695915@206.13.95.227> <[e-mail]> <4vk6r5$[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: tealexan.ca.oracle.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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X-Mailer: Mozilla 3.0 (WinNT; I)
Xref: news2.epix.net rec.antiques.radio+phono:21690 rec.radio.amateur.antenna:23912 rec.radio.amateur.digital.misc:16820 rec.radio.amateur.equipment:31981 rec.radio.amateur.homebrew:16572 rec.radio.amateur.misc:106248 rec.radio.amateur.space:7433 rec.radio.cb:30398 rec.radio.scanner:55701 rec.radio.shortwave:78161 rec.radio.swap:72023 rec.video.satellite.dbs:33650 rec.video.satellite.europe:7229 rec.video.satellite.misc:5525 rec.video.satellite.tvro:31260

Kenneth E. Harker wrote:
>
> In article <[e-mail]>, [e-mail] (Tim
> Gerchmez) wrote:
>
> > On 23 Aug 1996 12:05:57 GMT, Phil Wakely <[e-mail]> wrote:
> >
> > >[e-mail] (Tim Gerchmez) wrote:
> > >>On Wed, 21 Aug 1996 04:46:16 GMT, [e-mail] (Gregg) wrote:
> > >>
> > >>
> > >>>>Vs lbh pna ernq guvf, lbh ernyyl bhtug gb trg bhg zber
> > >>>
> > >>>Url!  Jung xvaq bs n penpx vf gung?  :-D
> > >>
> > >>Urururur.. V gubhtug EBG13 jnf bhg bs qngr.. guvf vf gur svefg gvzr
> > >>V'ir frra vg hfrq va dhvgr n juvyr ;)
> > >>
> > >
> > >Jung vf/jnf EBG13 ??
> > >
> >
> > Tvira gung lbh rapbqrq gur nobir, lbh onfvpnyyl nyernql xabj jung vg
> > vf.  Vg'f n fvzcyr Hfrarg rapbqvat zrgubq (sbetbg jurer vg bevtvangrq,
> > fbzrbar ryfr pbhyq cebonoyl gryy lbh).  V unqa'g rire frra vg hfrq
> > orsber hagvy guvf guernq fgnegrq.  Zl arjfernqre (Ntrag .99S) vapyhqrf
> > n EBG13 rapbqre/qrpbqre, fb V'z abg qbvat guvf ol unaq ;)
>
> Gur svefg checbfr V rire fnj EBG-13 hfrq sbe (onpx va 1991 be gurernobhgf)
> jnf gb uvqr rvgure gur chapuyvar bs be na ragver wbxr gung jnf cbgragvnyyl
> bssrafvir be bs n evfdhr angher, cercraqrq jvgu n pyrnegrkg qvfpynvzre, fb
> nf gb nyybj gur vaqvivqhny ernqre gur bcgvba bs jurgure be abg gb ivrj gur
> zngrevny.  V'z fher gurer ner bgure tbbq ernfbaf sbe vg nf jryy.
>
> Nf gb jurer vg bevtvangrq, vg'f n irel fvzcyr Pnrfne pvcure gung'f orra
> nebhaq n ybat juvyr (fvapr ng yrnfg gur qnlf bs Whyvhf Pnrfne) - lbh whfg
> fuvsg rirel yrggre 13 fcnprf va gur nycunorg (jenccvat nebhaq nf
> arprffnel.)  V'z abg pregnva jung "EBG" zrnaf be jurer vg pnzr sebz,
> gubhtu.
>
ROT-13 =>  ROTate 13


From [e-mail] Mon Sep 02 06:53:24 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.megalink.net!imci4!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Jean-Philippe PAULINO)
Newsgroups: rec.radio.amateur.homebrew
Subject: Bandwidth of a 14.4 (or 28.8) modem?
Date: 28 Aug 96 12:44:38 GMT
Organization: ucsd usenet gateway
Lines: 14
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

The bandwith for 14.4 and 28.8 Kbits modems is the bandwith of phone lines :
3Khz. This modems use separate audio carriers. Each carrier change in
amplitude and phase. The problem for using this methods on Ham band is that
they need " equalization before transmitting...and also full-duplex. If you
use this technic on VHF Band, the time to equalize (on half-duplex
communication)destroy the avantage of this hi-speed modems regarding to the
classic 1200 bits.

Jean-Philippe
73 from F1TMY

[e-mail]
PAULINO  Jean-Philippe



From [e-mail] Mon Sep 02 06:53:26 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-stk-3.sprintlink.net!metro.atlanta.com!cssun.mathcs.emory.edu!cs.utk.edu!news.msfc.nasa.gov!news.sgi.com!swrinde!cs.utexas.edu!howland.erols.net!newsfeed.internetmci.com!in2.uu.net!mcsun!EU.net!Norway.EU.net!nntp.uio.no!news.cais.net!news2.cais.com!news
From: Charles Hoffman <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: Whatever happened to AC-SSB ??
Date: Wed, 28 Aug 1996 13:22:23 -0500
Organization: K5SBU
Lines: 23
Message-ID: <[e-mail]>
References: <4h1tmr$[e-mail]> <4h3rqe$[e-mail]> <[e-mail]> <4vt2ea$[e-mail]> <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: cc-dup-71.davlin.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0b5aGold (Win95; I)
To: Rob Frohne <[e-mail]>
Xref: news2.epix.net rec.radio.amateur.homebrew:16554 rec.radio.amateur.misc:106213

Interesting.  I will take a look.  Incidentally, I have a VBC Model 3000
Baseband Transeiver if anyone is interested, with book; make offer.

Rob Frohne wrote:
>
> A couple of my engineering students and I picked up the frequency
> companding idea and implemented it on the TI DSK DSP evaluation board.  It
> was written up
> in QEX a while back.  The editors allowed me to put a copy on my web page.
You
> can see it at http://www.wwc.edu/~frohro/qex/qex-art.html.  We didn't implem
ent
> the amplitude compandor, but that could be added in.  Our testing indicated
that
> it was a feasible system, but I doubt it will ever catch on, as there are be
tter
> ways of reducing the spectrum with DSP.
>
> --
> Rob Frohne
> E.F. Cross School of Engineering
> Walla Walla College
> 204 S. College Ave.
> College Place, WA 99324
>
> [e-mail]
> http://www.wwc.edu/~frohro


From [e-mail] Mon Sep 02 06:53:27 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-pen-14.sprintlink.net!news-dc.gsl.net!news.gsl.net!news-res.gsl.net!news.gsl.net!usenet.eel.ufl.edu!spool.mu.edu!howland.erols.net!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Pat Barthelow)
Newsgroups: rec.radio.amateur.homebrew
Subject: HF AMP POWER SUPPLY DIODES
Date: 28 Aug 96 15:35:50 GMT
Organization: ucsd usenet gateway
Lines: 15
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

      I am re-designing a homebrew amplifier that uses 4-400As and
a power supply using a BC-610 HV transformer.  (Remember those?)
I discovered that the BC-610 transformer has two taps on the
primary, allowing 2500 volts, ac, or 3000 volts AC at the output.
The 4-400's work more efficiently at the higher plate voltages, and
I want to implement a HV increase.  I have a roller inductor, which
will allow adjustment of the PI Network output impedance for the
increased plate voltage.  Currently, the 2500 volt tap produces 2700
vdc unloaded, and 2500 VDC loaded.  The power supply is a Choke
input, full wave, using two diode blocks, made by Diodes, Inc.
Model number 7030.  I would like to know what the voltage and
current ratings of these diodes are, to see if they would take the
increased voltage from the PS.   Any help?
Thanks, de Pat, AA6EG, [e-mail]



From [e-mail] Mon Sep 02 06:53:28 1996
Path: news2.epix.net!news3.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news-out.microserve.net!news-in.microserve.net!news
From: [e-mail] (tyler)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NEW HAM wanting some advice! :-)
Date: 28 Aug 1996 15:40:42 GMT
Organization: Your Organization
Lines: 25
Distribution: world
Message-ID: <501p9q$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: sl29.cyberia.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.7


>Was wondering if anyone could point me toward the right direction in
>obtaining schematics and/or kits for a couple of items.
>
>Since I'm a no-code right now (working on it though!) I'd like to work the
>6 meter and some of the MW range.
>
>First off, what about a schematic and/or kit for a 6 meter radio?
>
>And secondly, what about a schematic and/or kit for a RADAR Gun? I am
>assuming this one is legal of course. Correct me if I'm wrong here! Was
>wanting to build a RADAR gun and clock vehicles,check speeds,etc.
>

I think what you want is a Ramsey catalog. They have 6 mtr and radar
 gun kits and lots of other cool stuff too.

Ramsey Electronics inc.
793 Canning Parkway
Victor, New York 14564

Phone [phone]
call to order:  [phone]  You could probably call this number
and get a catalog sent to you.  have fun... tyler  N3SPD



From [e-mail] Mon Sep 02 06:53:29 1996
Path: news2.epix.net!news3.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news.msfc.nasa.gov!news.sgi.com!sdd.hp.com!col.hp.com!canyon.sr.hp.com!glenne
From: [e-mail] (Glenn Elmore)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Why difficult to generate high power at UHF?
Date: 28 Aug 1996 16:14:03 GMT
Organization: Hewlett Packard Sonoma County
Lines: 34
Message-ID: <501r8b$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: n6gn.sr.hp.com
X-Newsreader: TIN [version 1.2 PL2.2]

Charles Curtis ([e-mail]) wrote:

: Less power and more antenna gain results in the same radiated
: signal strength, but as frequency increases, path loss increases the
: same amount that antenna gain increases (all other factors
: being held constant, including coax loss).  So the *same*
: power is required.

This isn't quite the whole story.

Traditionally, "path loss" is defined between two isotropic, or at least
*electrically* constant aperture, antennas.  This gives constant ERP but
diminishing signal; thus the 'loss' misnomer.  However, conservation of
energy is not violated and no signal is actually lost, the far end just
doesn't catch it all.

  As soon as a *physically* constant aperture antenna is subsitutued at
one end of the path, recovered signal is constant with frequency.
However, if constant physical size isused at *both* ends things get
*better* with frequency at the rate of 20*log(F).  Thus LESS power is
required as higher frequenies are used.

Seem my www pages (under ARRL conference papers) below for details.

Glenn Elmore n6gn

amateur IP:     [e-mail]
Internet:       [e-mail]

|--------------- N6GN's Higher Speed Packet WWW Page -------------------|
|                                                                       |
|       http://www.tapr.org/~n6gn/index.html            |
|                                                                       |
|-----------------------------------------------------------------------|


From [e-mail] Mon Sep 02 06:53:30 1996
Path: news2.epix.net!news3.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news.sgi.com!enews.sgi.com!EU.net!Norway.EU.net!oslonett.no!sn.no!online.no!nntp-oslo.UNINETT.no!nntp-trd.UNINETT.no!mashallah!borrel
From: Borre Ludvigsen <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: ICOM TV-R7000 synch
Date: Wed, 28 Aug 1996 18:52:11 +0000
Organization: UNINETT news service
Lines: 14
Message-ID: <Pine.NXT.3.91.960828184552.414E-100000@mashallah>
NNTP-Posting-Host: mashallah.ludvigsen.hiof.no
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=ISO-8859-1
Content-Transfer-Encoding: QUOTED-PRINTABLE
X-Sender: borrel@mashallah
Xref: news2.epix.net rec.radio.amateur.equipment:31996 rec.radio.amateur.homebrew:16580


Is there anyone who can tell me where I can take out a synch signal from=20
the PCB of the ICOM TV-R7000 TV receive adapter?

Email answers appreciated as I don=E5t often visit this group.

- Barre


         Borre Ludvigsen - http://www.hiof.no/~borrel=20
                finger: [e-mail]





From [e-mail] Mon Sep 02 06:53:31 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-atl-21.sprintlink.net!psgrain!iafrica.com!pipex-sa.net!plug.news.pipex.net!pipex!tank.news.pipex.net!pipex!news.be.innet.net!INbe.net!news.nl.innet.net!INnl.net!hunter.premier.net!news.uoregon.edu!vixen.cso.uiuc.edu!howland.erols.net!cs.utexas.edu!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Jean-Philippe PAULINO)
Newsgroups: rec.radio.amateur.homebrew
Subject: CCIR and ZVEI Tones Coder/Decoder
Date: 28 Aug 96 23:16:02 GMT
Organization: ucsd usenet gateway
Lines: 7
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

I'm also looking for a ship which can decode and send the professionnals
standards of selcall (ZVEI, CCIR,...).

Jean-Philippe F1TMY
[e-mail]
PAULINO  Jean-Philippe



From [e-mail] Mon Sep 02 06:53:32 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!cam-news-hub1.bbnplanet.com!howland.erols.net!netcom.com!netcom.net.uk!ix.netcom.com!news
From: [e-mail] (Mark B. Dittmar)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need ballast tube
Date: 29 Aug 1996 03:05:37 GMT
Organization: Netcom
Lines: 7
Message-ID: <5031e1$[e-mail]>
NNTP-Posting-Host: den-co6-24.ix.netcom.com
X-NETCOM-Date: Wed Aug 28 10:05:37 PM CDT 1996


    I am looking for a 60*92 ballast tube for an old receiver.  Does
anyone know of a source for ballast tubes ?  Any suggestions would be
appreciated.

Mark Dittmar, WD8PCE
[e-mail]


From [e-mail] Mon Sep 02 06:53:33 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!tezcat!cam-news-hub1.bbnplanet.com!howland.erols.net!nntp.crl.com!LSNT1!LSNT6!not-for-mail
From: [e-mail]
Subject: buliding a stable fm transmitter for high school class
Message-ID: <81c7cc$14e6.98@LSNT6>
Date: Thu, 29 Aug 1996 03:08:12 GMT
X-Newsreader: Forte Free Agent 1.0.82
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My neighbor teaches an electronics class at a local high school and
has asked for my advice. His students build projects for class and a
popular one is a low power FM (88 to 108 MHZ) transmitter that meets
FCC requirement. Most of the circuits available offer poor performance
being a simple LC oscillator with no buffering. He would like to find
a circuit that offers good stability and sound. He would also like to
avoid using a PLL or XTAL multilpier approach as this is beyoun the
scope of his class.

The audio section is not a problem. I simply used an OP-AMP for this
stage. It's the RF section that's the challange. I've built prototypes
using the classic Collpits configuration and NP0 or C0G caps but
haven't quite got the stability nailed down.

While I realize this group is primarily for Ham's, I'd like to pick
your brains on this one.

Thanks.





From [e-mail] Mon Sep 02 06:53:34 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!newsfeed.internetmci.com!news.bctel.net!news.smartt.com!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Motorola Data Sheets and Applications notes
Date: Thu, 29 Aug 1996 03:42:00 GMT
Organization: Smarttnet
Lines: 24
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: burn-mx0203919.smartt.com
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On 28 Aug 96 23:16:17 GMT, [e-mail] (Jean-Philippe
PAULINO) wrote:

>        I'm looking for Motorola datashetts and applications notes for RF
>purposes, in Europe I've try to write to the litterature center but... no
>reponse.
>Internet was a good way for this search, but...I only have the connexion at
>the Web //:Motserv.indirect.com
>Does anyone no where I can found this documentations to improve the South
>France RACE network?
>Many Thanks   F1TMY
>
>[e-mail]
>PAULINO  Jean-Philippe


I had a few problems actually getting the data sheets from the motserv
address but I finally found this:
http://motserv.indirect.com/lit/html/br135a/br135apnotes.html
if you can't get the notes from the web, they'll FAX them to you
- it seems to work pretty well ( in Canada anyway ).
I hope this helps!

Brian  VE7IJQ


From [e-mail] Mon Sep 02 06:53:35 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: External antenna for radio?
Date: Thu, 29 Aug 1996 04:50:10 GMT
Organization:
Lines: 23
Message-ID: <5037f0$[e-mail]>
References: <[e-mail]> <[e-mail]>
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[e-mail] (Joe Pritchard) wrote:

>fiz <[e-mail]> wrote:

>>Hi,
>>Does anyone have any ideas on how to
>>hook up an antenna (a longwire variety) to this radio that I can toss out
>>the window, without having to make major alterations to the radio itself.
>>I'm considering simply opening the case and soldering a wire onto the
>>place where the whip is attached. I would rather have some type of
>>antenna which would couple to the whip without being permanently
>>attached.
>>ttfn  fiz (KG0YG)

Use a small alligator clip with a random length of wire connected to
it. (Experiment with the length of this wire, try one as long as space
allows and if the radio picks up too much, shorten the wire a few
inches at a time.) Attach the clip to your radio's telescopic antenna
and see what happens. You can't hurt anything this way and it may do
just what you want.
                                73,
                                Butch N2YMJ



From [e-mail] Mon Sep 02 06:53:36 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!newsfeed.internetmci.com!super.zippo.com!zdc!news4.noc.netcom.net!noc.netcom.net!ix.netcom.com!news
From: "michael d. ferraro" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Solder Fumes
Date: 29 Aug 1996 06:29:10 GMT
Organization: Netcom
Lines: 10
Message-ID: <01bb9573$35465500$29c920cc@pppusername>
NNTP-Posting-Host: sba-ca1-09.ix.netcom.com
Mime-Version: 1.0
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X-NETCOM-Date: Thu Aug 29  1:29:10 AM CDT 1996
X-Newsreader: Microsoft Internet News 4.70.1155

There was a recent Harvard University study that involved observing 100
rats that were subjected to intense solder fumes (Kester solder 60/40) for
a period of 2 weeks. The results were published and were very interesting.
Here is what they found:

14 Rats ended up building their own nests.
85 Rats bought theirs from Japan
1 Rat escaped and took up stamp collecting !

73's de Mike K6ZSR   ;-)


From [e-mail] Mon Sep 02 06:53:37 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!nntp.teleport.com!ip-pdx05-14
From: [e-mail] (Roy Lewallen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Field Strength Meter
Date: Thu, 29 Aug 96 07:20:36 GMT
Organization: EZNEC Antenna Software
Lines: 17
Message-ID: <503g9u$[e-mail]>
References: <Q224B257@d57004>
NNTP-Posting-Host: ip-pdx05-14.teleport.com
X-Newsreader: News Xpress Version 1.0 Beta #3

In article <Q224B257@d57004>, [e-mail] (Hugh Maher) wrote:
>
>
>Some time ago I started collecting parts for a Field strength meter I was
>going to build from a magazine article. This got put aside and now I
cannot
>find the magazine article. This meter operated over several decades as I
>recall and used matched diodes for rectification and feedback around an
>op-amp to get linear results down to millivolts. Does anyone recall the
>magazine or year------I think it was QST or 73?

Either "A Simple and Accurate QRP Directional Wattmeter", QST, Feb. 1990,
p. 19, or "The Tandem Match -- An Accurate Directional Wattmeter", QST,
Jan. 1987, p. 18. (For the latter, see also Technical Correspondence, Jan.
1988, p. 49.)

Roy Lewallen, W7EL


From [e-mail] Mon Sep 02 06:53:38 1996
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From: burt lang <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: Whatever happened to AC-SSB ??
Date: Thu, 29 Aug 1996 11:57:32 -0700
Organization: ve2bmq
Lines: 5
Message-ID: <[e-mail]>
References: <4h1tmr$[e-mail]> <4h3rqe$[e-mail]> <[e-mail]>
Reply-To: [e-mail]
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Isn't AC-SSB the mode now used commercially in the new 220-222
commercial land mobile band?

Burt



From [e-mail] Mon Sep 02 06:53:39 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!tandem!pacbell.com!dmturne
From: [e-mail] (Dave Turner)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NTSC >> PAL Converter kits/projects????
Date: 29 Aug 1996 16:10:12 GMT
Organization: Pacific Bell
Lines: 34
Distribution: world
Message-ID: <504fd4$[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: stdin
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit


In article <[e-mail]>, Mark Zenier
<[e-mail]> writes
>
>: So I need some kit/project/unit that would allow me to tave the VIDEO &
>: AUDIO from the sockets on the back of the satellite RX and then arrive at
>: the required PAL signal,  hopefully already RF modulated.
>
>In that case, I'd go with the cheap and sloppy method of setting up
>an NTSC or multistandard monitor and aiming an old camera/camcorder
>at it.  Give it it's own channel on your MATV setup, so you can watch
>incoming PAL on another channel, undegraded.
>
>Mark Zenier  [e-mail]  [e-mail]
>

For what it's worth, Home Control Concepts (1-800-CONTROL (orders only)
1-619-693-8887 (info, prices)) advertised in their 1995 sale catalog

        NTSC to PAL Converter

        Converts any NTSC video system to PAL format.
        Easily connects between your VCR, Satellite Receiver,
        or Camcorder and your TV to view on PAL M/N video systems.
        Works automatically. Eliminates the need for purchasing
        additional components. Operates on 120V or 220/240V AC.
        Includes AC adaptor. Regular pay $hundreds. HCC-VIDPAL

        $69!

Other than what it says in the ad, I have no idea what is inside the box.


--
Dave Turner     [phone]  [e-mail]


From [e-mail] Mon Sep 02 06:53:40 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!nntp04.primenet.com!nntp.primenet.com!newspump.sol.net!uwm.edu!math.ohio-state.edu!howland.erols.net!cam-news-hub1.bbnplanet.com!uunet!in2.uu.net!noos.hooked.net!news.clark.net!mr.net!winternet.com!news
From: Mark Brown <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: 2m amplifier
Date: Thu, 29 Aug 1996 16:12:02 -0700
Organization: StarNet Communications, Inc
Lines: 6
Message-ID: <[e-mail]>
NNTP-Posting-Host: 206.146.5.212
Mime-Version: 1.0
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Hi all
     Does anybody have a construction article for a 2m amp using the
8877? I am also interested in any info on using the svetlana 4cx800a on
2m.
     Thanks
     Mark


From [e-mail] Mon Sep 02 06:53:41 1996
Path: news2.epix.net!news3.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!info.ucla.edu!nnrp.info.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (JOHN F. McCLUN)
Newsgroups: rec.radio.amateur.homebrew
Subject: Request for info
Date: 29 Aug 96 17:05:29 GMT
Organization: UNIVERSITY OF MD DENTAL SCHOOL
Lines: 14
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

Sometimes replying directly to a request is better than answering to
the whole group.  If you use an psuedo name or remailer, or don't have
the correct address the mail is returned and then the post must
bemade to the whole group.

Brain @ ??? ([e-mail])???? -
  Probaly the best homebrewers/ kit builders web page is the QRP
page at <http://qrp.cc.nd.edu/qrp-l/>  Has valuable info on
homebuilding, homebrewing, test of various kits and hints &
suggestions.  Also has the best discussion group going on Amateur
Radio, I feel.

John  <N3REY>
Always QRP!


From [e-mail] Mon Sep 02 06:53:42 1996
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From: [e-mail] (Tony Smith)
Newsgroups: sci.electronics.components,sci.electronics.basics,rec.radio.amateur.homebrew
Subject: Re: What is a Gunn diode ?
Date: 29 Aug 1996 19:54:18 GMT
Organization: The University of Manitoba
Lines: 12
Message-ID: <504sha$[e-mail]>
References: <4vhlep$[e-mail]> <4vo1o4$[e-mail]> <4vo55a$[e-mail]>
NNTP-Posting-Host: ts2m-2.mbnet.mb.ca
X-Newsreader: WinVN 0.92.6+
Xref: news2.epix.net sci.electronics.components:7105 sci.electronics.basics:7810 rec.radio.amateur.homebrew:16573

In article <4vo55a$[e-mail]>, [e-mail] (Roy Lewallen) s
ays:
>
>In article <4vo1o4$[e-mail]>,
>   [e-mail] (Tony Smith) wrote:

>You can always count on some hotshot to shoot his mouth off.
>

What?? You didn't even take a shot at answering the question?
Son-of-a-Gunn, anyways!

  Tony (Sorrier yet.)


From [e-mail] Mon Sep 02 06:53:43 1996
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From: [e-mail] (Bill Bennett)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: UK 934 MHz CB
Date: Thu, 29 Aug 1996 20:37:23 GMT
Organization: Titan Information Systems
Lines: 12
Message-ID: <504v23$[e-mail]>
NNTP-Posting-Host: moe.bc.tisc.titan.com
X-Newsreader: Forte Free Agent 1.0.82

   Re: UK 934 MHz CB
   From Newsline
    UK: NO MORE 934 MHz CB

   The United Kingdom will cancel its 934 Mhz Citizens Radio band on
December 31st of 1998 and the band will be converted to a commercial
digital telephone service.

Are these radios FM?
Could they be used on the 920Mhz US amateur band? repeaters?
Does any one in the UK have any for sale?



From [e-mail] Mon Sep 02 06:53:44 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!nntp04.primenet.com!nntp.primenet.com!tank.news.pipex.net!pipex!usenet.eel.ufl.edu!spool.mu.edu!howland.erols.net!newsxfer2.itd.umich.edu!portc01.blue.aol.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (Hipiket)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Question abt Push-pull RF Amplifier plate tank circuits
Date: 29 Aug 1996 23:05:35 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 21
Sender: [e-mail]
Message-ID: <505lpv$[e-mail]>
References: <4vg4u8$[e-mail]>
Reply-To: [e-mail] (Hipiket)
NNTP-Posting-Host: newsbf02.mail.aol.com

Wow!  What a teriffic debate I sent careening down the mountain....

The plan I had was to use two RCA 833A's in a push-pull grounded grid
arrangement, with the objective of minimum distortion, rather than maximum
output.  I intend to use  a plug-in coil scheme, with doorknob "helper"
capacitors on wavelengths between 160 and 40 meters. Thus the split-stator
capacitor will not have to be of great size while providing a generous
breakover rating. Loading adjustment will be by means of a variable link.
160-15 meter coverage is planned (10 meters...if the band's open, you
don't need an amplifier and when it isn't an amp won't do much good
anyway. Really the same is true on 15 unless you're trying to out-holler
the other lids working a rare DX station.)

The real difference is that the power supply for this amp will provide
3250 VDC @ 850 MADC and only weighs 12 lbs (450 g)!!!  It is silent,
isolated, regulated to 0.5%, ripple-free as can be. I conceived the idea
as a hybrid between a modern VCR power supply and that of the amp in the
so-called, "boom-car"...

Thanks for all of the valuable suggestions I've seen go by my CRT. Too bad
the Internet will make working DX stations seem quaint...


From [e-mail] Mon Sep 02 06:53:46 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-dc-5.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-pen-4.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!news.frontiernet.net!mulveyr
From: [e-mail] (Rich & Katy Mulvey)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NEW HAM wanting some advice! :-)
Date: 30 Aug 1996 01:59:33 GMT
Organization: Mulvey Home Node
Lines: 37
Message-ID: <[e-mail]>
References: <[e-mail]> <501p9q$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: usr6-157.frontiernet.net
X-Newsreader: slrn (0.8.8.2 UNIX)

On 28 Aug 1996 15:40:42 GMT, tyler <[e-mail]> wrote:
>
>>Was wondering if anyone could point me toward the right direction in
>>obtaining schematics and/or kits for a couple of items.
>>
>>Since I'm a no-code right now (working on it though!) I'd like to work the
>>6 meter and some of the MW range.
>>
>>First off, what about a schematic and/or kit for a 6 meter radio?
>>
>>And secondly, what about a schematic and/or kit for a RADAR Gun? I am
>>assuming this one is legal of course. Correct me if I'm wrong here! Was
>>wanting to build a RADAR gun and clock vehicles,check speeds,etc.
>>
>
>I think what you want is a Ramsey catalog. They have 6 mtr and radar
> gun kits and lots of other cool stuff too.
>


Of course, Ramsey is *infamous* for the extraordinarily poor filtering
on their receivers and transmitters.  Several magazine articles in the
past 2 years have found that the transmitters were so dirty that they
were in violation of FCC regs.  I was once young and naive enough to
buy one of their receiver kits.  It was the first and last purchase I
ever made from them.  Why?  Well, a 20M CW receiver that has a bandpass
of about 25khz is pretty useless.  :-)

- Rich


--
My mailer has the unfortunate tendency to bounce 10,000 copies of any
junk mail I receive back to the sender.  Be warned.





From [e-mail] Mon Sep 02 06:53:47 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!tezcat!cam-news-hub1.bbnplanet.com!howland.erols.net!newsfeed.internetmci.com!news.winterlan.com!frii.com!usenet
From: Avatar <[e-mail]>
Newsgroups: rec.radio.scanner,rec.radio.shortwave,rec.radio.swap,rec.radio.cb,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: HELP: Antenna Tuner Design Needed
Date: Fri, 30 Aug 1996 18:46:03 -0700
Organization: Front Range Internet, Inc.
Lines: 17
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ftc-22.ppp.frii.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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Michael Neidich wrote:
>
> Need a schematic/parts list to build a receiving antenna
> tuner/preselector 10-25 MHz, mostly to reject interfering out of band
> signals.  Point me in the right direction if there is a good commercial
> unit, please.
> Mike

Any recommendation would be suspect without the advisor knowing more
about your setup.

1. Does your receiver have a 50 ohm or Hi-Z input?
2. What type of antenna and feedline are you using?
3. Are you adept at building electronics equipment?
4. How much are you willing to spend for a tuner?




From [e-mail] Mon Sep 02 06:53:48 1996
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From: [e-mail] (Tom Bruhns)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Microwave Diodes
Date: 30 Aug 1996 19:09:09 GMT
Organization: Hewlett Packard Corvallis Site
Lines: 16
Message-ID: <507e8l$[e-mail]>
References: <503lqp$[e-mail]>
NNTP-Posting-Host: hplsnb.lsid.hp.com
X-Newsreader: TIN [version 1.1 PL9.4]

Chris Jones ([e-mail]) wrote:
:     As an experimenter, I would like to get my hands on a
: diode that could rectify 20, 50 or even 100 GHZ microwaves.
:  Are there any commercially available?

Get ahold of the HP Communications Components catalog.  The
HSCH-9101 GaAs Beam Lead Schottky Barrier Diode is rated for
use through 44GHz and I'd be surprised if you couldn't get
it to give some useable rectification well above that.  They
are kinda small and might be a challenge for the typical
experimenter to actually use.  I have no idea what they cost.

--
Cheers,
Tom
[e-mail]


From [e-mail] Mon Sep 02 06:53:49 1996
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From: Charles Wenzel <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: buliding a stable fm transmitter for high school class
Date: Fri, 30 Aug 1996 22:00:28 -0700
Organization: Real/Time Communications Internet customer posting
Lines: 16
Message-ID: <[e-mail]>
References: <81c7cc$14e6.98@LSNT6>
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Instead of NPO capacitors, try capacitors with large negative temperature
coefficients (N1500, etc...N1500 means -1500 PPM per degree C). I'll bet
that the frequency of your oscillator drops when the temperature
increases and a negative temp-co capacitor will push it in the
correct direction. This temperature coefficient will be largely linear
and a properly chosen capacitor will greatly improve the stability. If
you are using a varicap diode for modulation, you could consider applying
a correction voltage to it in addition to the audio. The process of
finding the right value of temp-co capacitor or compensation voltage can
be quite instructive! Another approach is to ovenize the whole circuit by
placing it in a copper can with a proportional temperature controller. A
simple controller is used in my water barometer in our technical library
at www.wenzel.com. Let me know if you have any trouble finding parts
including compensation capacitors or thermistors.

Charles


From [e-mail] Mon Sep 02 06:53:51 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!tezcat!cam-news-hub1.bbnplanet.com!howland.erols.net!newsfeed.internetmci.com!in3.uu.net!news.accessone.com!news
From: [e-mail] (Ed Mitchell)
Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.shortwave,aus.radio.amateur.misc,aus.radio.amateur.digital
Subject: www.hamradio-online.com is now read in 43 countries!
Date: 30 Aug 1996 23:36:55 GMT
Organization: Virtual Publishing Co.
Lines: 23
Message-ID: <507tun$[e-mail]>
NNTP-Posting-Host: vbook.accessone.com
X-Newsreader: WinVN 0.99.5
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With perhaps the widest distribution of any amateur radio "magazine" in the
world, www.hamradio-online.com is now being read in 43 countries around the
globe. And its free, self supported by us and you, our readers who contribute
great feature stories for this online magazine.

If you haven't paid us a visit, please stop on by and have a look around.
There's lots to see - from feature stories all the time, to real-time
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And watch for more cool stories and new features over the coming months. We
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------------------------
Ed (KF7VY) and Kim (N7VPL) Mitchell
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Visit Ham Radio Online, it's free! at
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From [e-mail] Mon Sep 02 06:53:52 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!tank.news.pipex.net!pipex!nntp04.primenet.com!nntp.primenet.com!howland.erols.net!netcom.com!tgm
From: [e-mail] (Thomas G. McWilliams)
Subject: Re: Microwave Diodes
Message-ID: <[e-mail]>
Organization: Jot-Em Down Store and Library
X-Newsreader: TIN [version 1.2 PL1]
References: <503lqp$[e-mail]> <507e8l$[e-mail]>
Date: Sat, 31 Aug 1996 03:55:40 GMT
Lines: 12
Sender: [e-mail]

Tom Bruhns ([e-mail]) wrote:
: Get ahold of the HP Communications Components catalog.  The
: HSCH-9101 GaAs Beam Lead Schottky Barrier Diode is rated for
: use through 44GHz and I'd be surprised if you couldn't get

What about a common LED? I've been told that GaAs LEDs could be used
for rf purposes successfully at microwave frequencies. Is this true?
Maybe they wouldn't be suitable for HP instruments but perhaps they
would be acceptable for the home experimenter. Comments anyone?

[e-mail]



From [e-mail] Mon Sep 02 06:53:53 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!tezcat!cam-news-hub1.bbnplanet.com!howland.erols.net!newsfeed.internetmci.com!news.compuserve.com!ix.netcom.com!netcom.net.uk!dispatch.news.demon.net!demon!vantage.demon.co.uk
From: [e-mail] (Joe Pritchard)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: buliding a stable fm transmitter for high school class
Date: Sat, 31 Aug 1996 06:26:36 GMT
Lines: 49
Message-ID: <[e-mail]>
References: <81c7cc$14e6.98@LSNT6>
NNTP-Posting-Host: vantage.demon.co.uk
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[e-mail] wrote:

>My neighbor teaches an electronics class at a local high school and
>has asked for my advice. His students build projects for class and a
>popular one is a low power FM (88 to 108 MHZ) transmitter that meets
>FCC requirement. Most of the circuits available offer poor performance
>being a simple LC oscillator with no buffering. He would like to find
>a circuit that offers good stability and sound. He would also like to
>avoid using a PLL or XTAL multilpier approach as this is beyoun the
>scope of his class.

>The audio section is not a problem. I simply used an OP-AMP for this
>stage. It's the RF section that's the challange. I've built prototypes
>using the classic Collpits configuration and NP0 or C0G caps but
>haven't quite got the stability nailed down.

>While I realize this group is primarily for Ham's, I'd like to pick
>your brains on this one.

>Thanks.

Hi,

A multiplier approach needn't be too horrible; I've set tem up with a
dip meter and a scope and I would have thought that a couple of stages
would be adequate.

As to an LC set up with maximum stability, the main things to remember
are:
Get a good VHF transistor.
Isolate the oscillator from theaerial by a single stage buffer and
minimise aerial loading.
Stable power supply; watch using Zeners as the capacitance can
sometimes impact on the oscillator unless it's isolated by a choke
from the oscillator surcuit.
Consider etching the inductance on a PC board?
Use varicap tuning rather than a VC?

Hope this helps

Joe, G0RNC



There's only one decision to make;
get busy living or get busy dying.

Andy Dufresne, The Shawshank redemption.



From [e-mail] Mon Sep 02 06:53:54 1996
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From: [e-mail] (David A Nickel)
Newsgroups: rec.radio.amateur.homebrew
Subject: Low TCR variable resistor for RF application?
Date: 31 Aug 1996 15:57:39 GMT
Organization: Purdue University, W. Lafayette, IN
Lines: 18
Message-ID: <509ndj$[e-mail]>
NNTP-Posting-Host: widget.ecn.purdue.edu

I'm working on a project that uses a Wheatstone bridge to measure the
really fast fluctuations from a resistance-based sensor (the whole
fluctuation lasts a few microseconds, and we'd like to see
sub-microsecond events during the interval).  I make various sensors
with different nominal resistances, so I'd like to use a variable
compensating resistor that I can "tune in" to balance the bridge.

The relative resistance change from the sensor is small (1000's of
ppm full scale), so I would like a stable compensating resistor --
thermal drift is annoying, mechanical noise is deadly.

What kind of variable resistor could I use to select a value
from 100 to 1000 Ohms, tunable to about 1 Ohm, stable to 0.1 milliOhm,
that's mostly a resistor at 10 MHz?

Thanks for any suggestions,
Dave Nickel
[e-mail]