World of Ham Radio 1997/WOHR97_AmSoft_(1997-02-01).iso/usenets/1995_11/_homebre.txt

Text File | 1997-02-01 | 600KB | 14,039 lines

The World of Ham Radio CD-ROM



From Unknown Fri Nov 03 12:26:40 1995
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (David Fifield)
Subject: Re: Q: Using polarized caps back to back
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Organization: National Semiconductor, Santa Clara
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Date: Wed, 1 Nov 1995 02:01:35 GMT
Lines: 45

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

> Hi,
>
> I need a very long time constant and need a non-polarized cap
> around 100uf. I have some questions about using polarized caps back
> to back:
>
> 1. Is there any long term problems doing this.
>
> 2. What type of cap should be used, aluminum electrolytic or can I
>    use tantalums.
>
> Thanks,
> Larry Cochrane

Larry,

I recall from long ago that there are indeed long term breakdown issues with
using electrolytic capacitors back to back. Aluminum electrolytics would be
OK, but tantalums a definite no-no, they tend to go short circuit the moment
you reverse bias them with any voltage!

Anyway, you don't have to mess around like this! There are plenty of places
you can get non-polarized capacitors in the 100 microfarad range (they're used
mainly in loudspeaker crossovers).

I have used "Parts Express" in the past, they have a good selection.
They're on 1-800-338-0531.

Good luck.


73 de KE6ZBZ

Dave Fifield (ex G8INR)

Phone [phone], Fax [phone], email [e-mail]

This email/posting represents my own personal views and not those
of my employer, National Semiconductor Corp., who kindly tolerate
my extra curricular use of this medium.




From Unknown Fri Nov 03 12:26:41 1995
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From: [e-mail] (Donald J. Miller)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Q: Using polarized caps back to back
Date: 1 Nov 1995 06:04:12 -0800
Organization: CRL Dialup Internet Access        [phone]  [Login: guest]
Lines: 27
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References: <[e-mail]> <[e-mail]>
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X-Newsreader: TIN [version 1.2 PL2]

Clifford Buttschardt ([e-mail]) wrote:
:      If you would like to make your own, place diodes in series with any
: polaraized capacitor in the right direction to prevent reverse polarity
: and do a similar thing with another capacitor/diode in the reverse
: direction. Wire them in parallel. This is a very suitable replacement often
: better than the original and far cheaper but larger in volume.  73 Cliff  W6HDO

This won't work.

Both caps will charge up to the respective positive/negetive peak voltage,
after which *no current* (AC or DC) will flow thru the circuit.  This
circuit does *not* behave like a non-polarized cap.  Have you actually
used this circuit?

Consider this:  you can place a resistor (or a short for that matter)
accross a non-polarized cap to discharge it down to zero volts.  What
happens when you place a resistor accross your circuit?  Nothing --
no current flows.  Both diodes are reversed biased.

Later,


--
-------------------------------------------------
Don Miller         My opinions are my own!
[e-mail]
-------------------------------------------------


From Unknown Fri Nov 03 12:26:42 1995
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From: Fred <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: basic help needed wiring a phone plug
Date: Wed, 1 Nov 1995 06:24:42 -0500
Organization: Dayton Microcomputer Association; Dayton, Ohio, USA
Lines: 19
Message-ID: <[e-mail]>
References: <[e-mail]>
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In-Reply-To: <[e-mail]>



On Tue, 31 Oct 1995, Mike Miller wrote:

> I'm wiring a 2.5 and 3.5 mm radio shack phone plug (274-289, 274-284)
> and I'm not sure which terminal is which.  The 3.5 mm has three terminals:
> a 3/4 inch outer, and two smaller terminals.  They match up to the sleeve,
> ring, and tip, I'm just not sure which.
>
> Your assistance is greatly appreciated.
>
> Mike
> KB0JGS
> [e-mail]
>
>
Just grab your trusty ohm meter and check them.  That way no mistakes.
73 de ke8tq    Fred



From Unknown Fri Nov 03 12:26:43 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.mid.net!news.dra.com!news.starnet.net!wupost!ukma!netnews.wku.edu!wkuvx2.wku.edu!scottcr
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ATV North Country Radio (WARNING)
Message-ID: <[e-mail]>
From: [e-mail] (Chris Scott)
Date: 1 Nov 95 10:54:21 CDT
References: <46ggnc$[e-mail]> <46i5eq$[e-mail]>
 <46nspr$[e-mail]> <46o5s4$[e-mail]>
Organization: Western Kentucky University, Bowling Green, KY
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In article <46o5s4$[e-mail]>, [e-mail] (Tim Hynde ka8ddz/qrp Rochester, MI ) writes:
>
> I read a construction article last year for a 5 watt ATV tranciever
> available as a kit from North Country Radio out of NY. The kit looked
>
> What concerns me is I have not seen them advertise in 73 or QST has
> anyone built one of these or have any experience with this company?

I hate to dredge up dirt from the past, but NORTH COUNTRY RADIO
is the outfit that accepted my check and 2 meter radio for repair
(as the authorized service center),

AND NEVER RETURNED EITHER.  The familiar story of "it shipped last week,
didn't you get it?" or "Oh yeah, we had to order parts."

 This is technically mail fraud, but the
lawyer told me the dollar amount wasn't worth pursuing.

Remember me North Country Radio? WB9NEQ, my EBC 2M radio?

I have not forgotten.

--
[e-mail]  Chief Engineer, Public Radio- Western KY U
                     Telco: [phone]  Hm & Fax: [phone]
...just another insignificant VAX user.        \\\//
                                               (o o)
--------------------------------------------ooO-(_)-Ooo-----------------------


From Unknown Fri Nov 03 12:26:44 1995
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From: [e-mail] (Bruce Burke )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Easy PL-259 - CRIMPED!
Date: 1 Nov 1995 13:25:04 GMT
Organization: Motorola Inc
Lines: 39
Distribution: world
Message-ID: <477sfg$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: md20.comm.mot.com

In article [e-mail], [e-mail] (Gary Coffman) writes:
}In article <4718d0$[e-mail]> [e-mail] (Tim Hynde ka8ddz/qrp Rochester, MI ) writes:
}>Hints & Kinks, November QST page 83
}>
* PL259 stuff removed *
}
}The method in the Handbook, though recomended by Amphenol,
}isn't all that good either. If you must use a PL style
}connector, and I try to avoid them when possible, then
}you should use a Kings crimp connector. They offer a
}mechanically strong and gas tight connection when applied
}with the proper tooling (which costs over $200 BTW).
}NASA approves them, and TV stations live by them, in
}BNC and N too. (The tooling is bloody expensive, but
}it'll last a lifetime in amateur use. The connectors
}themselves are pretty inexpensive, no more than solder
}on connectors.)
Gary,
There's no such thing as a gas tight crimp on braid. There will always be
air, or gas in between the individual wires. A secondary sealing method
must be used in order to get this effect.

You're right about assembly, it must
be done properly. More often than not, when purchasing commercially
manufactured cables, they are improperly done. The properly manufactured cables
are quite expensive by comparision and the average ham probably won't want
to spend the difference, especially if he can't immediately tell the difference
between the two.

73,
Bruce, WB4YUC
}
}
}Gary
}--






From Unknown Fri Nov 03 12:26:45 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (The2X4)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Making labels from transparencies
Date: 1 Nov 1995 16:18:13 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 28
Sender: [e-mail]
Message-ID: <478o6l$[e-mail]>
References: <473ejf$[e-mail]>
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X-Newsreader: AOL Offline Reader

In article <473ejf$[e-mail]>, [e-mail] (Paul Zander)
writes:

>
>: I would use clear contact paper over the laser quality print. Contact
paper
>: is great for a lot of things and I've used it before
>
>One other thing, put the lettering on the bottom side of the plastic to
>protect it from wear.  If your software won't print a mirror image,
>print it on plastic.  Put that upside down on a photocopy machine, and
>make a copy onto a second transparency.
>
>

I tried the contact paper. It ends up clouded.

I reverse mine too. I need other  protection to hopefully prevent the
HP500c ink
from smearing with age. Did you have that problem and correct it?
A photocopy might also smear.

I've had the best results so far with a fine spray of SPRAY MOUNT glue but
still
get a slight smear in time. I am also going to try lamination.

Carl
The2x4


From Unknown Fri Nov 03 12:26:46 1995
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From: [e-mail] (The2X4)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ATV North Country Radio (WARNING)
Date: 1 Nov 1995 16:19:09 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 6
Sender: [e-mail]
Message-ID: <478o8d$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

Thanks your warning came in time. I was gonna get
one of their ATV 's.

Thansk.......................

Carl


From Unknown Fri Nov 03 12:26:47 1995
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From: Colin Edwards <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.equipment,sci.electronics
Subject: Re: Experience with HAMEG spectrum analysers ?
Date: Wed, 1 Nov 1995 16:37:20 +0000
Organization: Bespoke Project
Lines: 12
Distribution: world
Message-ID: <[e-mail]>
References: <[e-mail]>
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>
>I would like to know if anyone here is familiar with the HAMEG 5006 series
>spectrum analysers.

Yes, I have one. It did cost nearly much as a second hand HP141 setup,
but at least you can lift it.
Basically - It works very well, but the lack of any sort of output means
that you can't record readings.

Even in the UK it took months to get one delivered.
--
Colin Edwards


From Unknown Fri Nov 03 12:26:48 1995
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From: Bill Bennett <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: *** design of 10mtr to 6 mtr transverter ***
Date: 1 Nov 1995 16:50:09 GMT
Organization: The Titan Corporation, San Diego, CA, USA
Lines: 4
Message-ID: <4788g1$[e-mail]>
References: <[e-mail]> <[e-mail]>
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To: [e-mail]

what i think would be nice is a 2meter to 6 meter transverter that way you could use your 2
meter ht to access 6 meter repeaters, the ht has offsets and ctcss that would also be
required for 6 meters



From Unknown Fri Nov 03 12:26:49 1995
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Gary Coffman)
Subject: Re: LIGHTINING * HELP *
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <469ffi$[e-mail]> <[e-mail]> <[e-mail]>
Date: Wed, 1 Nov 1995 16:57:05 GMT
Lines: 81

In article <[e-mail]> mike <[e-mail]> writes:
>
>On Sun, 22 Oct 1995, Gary Coffman wrote:
>
>> You're right to be alarmed. Lightning can be a great hazard if station
>> layout isn't done properly to guard against it. But if the proper steps
>> are taken you can even continue to operate during direct strikes. Those
>> steps may be extreme in some cases, but it can be, and is, routinely
>> done in the broadcast field.
>>
>
>In the Amateur Radio field, chances are very very high that operating
>during a direct strike will more or less  kill you, along with all your
>equipment, regardless of the protection you have invested in. Even if
>you have 4 or so 8' copper rods pounded into the ground, lightning
>arrestors or gaps that are connected to the rods through HYDRO wire,
>etc.

An inadequate Earth terminal can cause some problems, but poor station
layout is a much more severe problem. It's possible, and often done,
to "float" the station independent of Earth, and still provide adequate
strike surge protection. This is routinely done for broadcast facilities
located on top of tall buildings for example. In principle (and in practice)
you don't care what the absolute potential is of your system reference.
It can float to any arbitrary value during a surge or strike, *as long
as everything in the station follows that reference potential*. This is
the key facilities layout issue. *There must only be one system reference
point*, and *everything* has to tie or clamp to it by a low impedance
path.

>Don't operate your station during a severe lightning storm. Disconnect
>all your radio equipment including other equipment in the vicinity of
>your radio equipment. By disconnect, I mean UNPLUG power cables from
>the mains, and UNPLUG antenna cables. You can go further and ground
>the termination of the antenna cable.

Note, a lightning bolt, which has travelled miles through open air,
will not be deterred by a few inches of air between your equipment
and the antenna cable, *unless you offer it a lower impedance path
to take*. In facilities layout, establishing low impedance paths from
the strike conductors to Earth can offer that low impedance path.
But that's sometimes difficult to do, so the alternative is to let
all the equipment *float with the surge*. That requires maintaining
a controlled copper connection between all the equipment and the
surge conductor. Small air gaps (and small in this context is anything
less than the distance to a good Earth terminal) can increase hazards.

Alternatively, you can try, as you suggest, to *totally* isolate
the equipment from *any* path the surge may wish to travel. That
requires disconnecting, and separating well away from the equipment,
*all* conductors. Still, aircraft in flight, as well isolated from
other conductors as you can get, do sometimes take damaging strikes
from uncontrolled currents using the conductive aircraft as a bridging
conductor in the air path. It is much preferred to offer the surge
a *controlled* path over which to travel rather than to let it determine
which path it wishes to take in a (seemingly) random manner.

>Even a good ground system will not protect you from a direct strike,
>cause all you need is a little trickle past the system to do the
>damage.

A good Earth connection can aid in directing surge. It will not
prevent surge, and if facilities layout is done incorrectly, it
can allow surge to do *more* damage.

>I'm not kidding...

Neither am I. Protecting from surge is simple in principle, but the
details of the implementation *count for nearly everything*. Simple
(minded) approaches can *make the problem worse*. And poor execution
of even good approaches can be catastrophic. This is one area where
a little knowledge can be a dangerous thing. Every amateur should
understand this topic *in complete detail* so that they can take
protective steps which won't inadvertently *make the risks greater*.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |


From Unknown Fri Nov 03 12:26:51 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.ro.com!news-out.internetmci.com!newsfeed.internetmci.com!chi-news.cic.net!newsspool.doit.wisc.edu!night.primate.wisc.edu!sdd.hp.com!hp-pcd!hpcvsnz!tomb
From: [e-mail] (Tom Bruhns)
Subject: Re: How to determine dBm when driving diode mixers with square waves
Sender: [e-mail] (News )
Message-ID: <[e-mail]>
Date: Wed, 1 Nov 1995 18:40:49 GMT
References: <4769lr$[e-mail]>
Nntp-Posting-Host: hplsnb.lsid.hp.com
Organization: Hewlett-Packard
X-Newsreader: TIN [version 1.1 PL9.4]
Lines: 20

Carl Gregory ([e-mail]) wrote:
: [e-mail] (Tom Bruhns) wrote:
: >Which immediately begs the question, "What of mixers rated for +17dBm or even
: >+27dBm LO input?"  After all, +27dBm is 1/2 watt, and at 50 ohms, this is
: >5 Vrms.

: These guys have extra diodes in each leg, so the voltage requirement is higher.
: Some also have an RC network in each leg.  See the Merrimac RF and Microwave

Aha.  Thanks for this info, Carl.  You don't get this impression from the
MiniCircuits catalog, which shows schematically single diodes.  But you can
infer it from the SWR curves, which maintain a reasonably low SWR for rated
LO input power over the range of mixers from +7dBm to +27dBm.  So the
higher-level mixers use additional diodes to handle higher voltage _and_
higher current.  These allow a higher RF input compression point.

--
Cheers,
Tom
[e-mail]


From Unknown Fri Nov 03 12:26:52 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!news.uiowa.edu!crpl.cedar-rapids.lib.ia.us!SABINW
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: diode mixer drive levels
Date: 1 Nov 1995 19:51:45 GMT
Organization: Cedar Rapids Public Library, Cedar Rapids, IA,  52401
Lines: 23
Distribution: world
Message-ID: <478j4h$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: crpl.cedar-rapids.lib.ia.us

Recent inputs regarding mixer LO drive are:
>: [e-mail] (Tom Bruhns) wrote:
>: >Which immediately begs the questers rated for +17dBm or even
>: >+27dBm LO input?"  After all, +27dBm is 1/2 was is
>: >5 Vrms.
>
>: These guys have extra diodes in each leg, so the voltage requirement is
>higher You don't get this impression from the MiniCircuits catalog,
>which shows schematically single diodes.  But you can infer it from
>the SWR curves, which maintains LO input power over the range of
>mixers from +7dBm to +27dBm.  So the higher-level mixers use
>additional diodes to handle high higher voltage _and_ higher current.
>These allow a higher RF input compression point.

The original question that was raised was whether a square wave drive
would improve the IMD of a DBM.  The response was that if a square wave
of current were used rather than a square wave of voltage the diodes
would behave more like an ideal switch, the idea being that the
on-resistance would be low over the entire half cycle and less
time-varying. My work with mixers has verified this many times.
But at very high frequencies this square wave of current is tough
to get.  Bill Sabin W0IYH



From Unknown Fri Nov 03 12:26:52 1995
Path: news.epix.net!news.sprintlink.net!EU.net!Belgium.EU.net!ping.be!news
From: Neal Campbell <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Coherent CW, what is it?
Date: 1 Nov 1995 19:53:49 GMT
Organization: PING Belgium
Lines: 11
Message-ID: <478j8d$[e-mail]>
References: <4749kg$[e-mail]>
NNTP-Posting-Host: dialup25.brussels2.eunet.be
Mime-Version: 1.0
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Content-Transfer-Encoding: 7bit
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To: [e-mail]
X-URL: news:4749kg$[e-mail]

There is usually a column about Coherent CW in the Digital Journal,
which is published by the IDRA. I believe you can get a free sample
copy.

They have a WWW homepage that you can find more information. If you
can't find the location, send me a note and I will dig it up for you!

73,
Neal




From Unknown Fri Nov 03 12:26:53 1995
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.msfc.nasa.gov!sol.ctr.columbia.edu!news.mindlink.net!van-bc!news.rmii.com!net73.qadas.com!user
From: [e-mail] (George De Grazio)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: help w/ headphones
Date: Wed, 01 Nov 1995 21:38:17 -0700
Organization: Hambrew Magazine
Lines: 11
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: net73.qadas.com

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

>  We run a "romance"
> crystal set Saturday morning session here in Central California just to
> keep the conept alive, but as you have difficulty getting parts..W6HDO
>
Cliff, this idea seems really neat. Could you send us some details in a
short article? We'd like to run it!
George De Grazio, WF╪K
Hambrew Magazine


From Unknown Fri Nov 03 12:26:54 1995
Path: news.epix.net!news.sprintlink.net!EU.net!Belgium.EU.net!ping.be!dialup42.hasselt.eunet.be!jan.anker
From: [e-mail] (Jan Anker)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.equipment,sci.electronics
Subject: Re: Experience with HAMEG spectrum analysers ?
Date: Thu, 2 Nov 1995 01:03:18
Organization: Anchor Datacomm
Lines: 33
Message-ID: <[e-mail]>
References: <[e-mail]>
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In article <[e-mail]> [e-mail] (Charlos Potma) writes:
>From: [e-mail] (Charlos Potma)
>Subject: Experience with HAMEG spectrum analysers ?
>Date: Tue, 31 Oct 1995 12:20:10 GMT

>hello all,

>some time ago in rec.radio.amateur.equipment a thread around HAMEG
>oscilloscopes developed. Most people seemed to favor these instruments.
>I would like to know if anyone here is familiar with the HAMEG 5006 series
>spectrum analysers. These analysers are (relatively) low-cost and seem
>to be quite adequate for use in homebrewing RF circuits. As an option
>the 5006 can be equipped with a tracking generator to be used in
>filter measurements.

>Any experience with these analysers ?

>thank you,

>charlos potma
>PA3CKR
>[e-mail]

I have the spectrum anal/track gen 8028/8038
Dont expect performance of a good HP analyser, but I think the
unit price/performance is good.
I only worry about service/spare parts.
I have a deffective cable which connects unit to the scope.
A funny BNC lookalike connector on this cable is deffective and it seems
to be impossible through the Dutch distributer to obtain a new cable or
connector. (airparts in alphen a/d rijn)
jan



From Unknown Fri Nov 03 12:26:55 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!eskimo!news
From: [e-mail] (Alan F. Jovanovich)
Subject: Re: Passive Mixer IP3 Question
X-Nntp-Posting-Host: tia1.eskimo.com
Message-ID: <[e-mail]>
Sender: [e-mail] (News User Id)
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References: <[e-mail]>
Date: Thu, 2 Nov 1995 02:19:39 GMT
Lines: 33


Thanks everyone, the response has been overwhelming!

                                        Alan
                                        KA7DAT


>Please Help!

>I have a passive mixer (diode ring DBM) and have measured the
>conversion loss to be 9.3 dB at the frequencies I am interested in
>with the drive level I have.

>The manufacturer (RF Prime) gives me an Input Intercept Point of
>+8dBm.

>Since the Input IP3 and Output IP3 differ by the gain, do I use a
>negative gain here?

>In other words, is the Output Intercept  -1.3dBm or +17.3dBm?

>I realize that the manufacturers figure is only good for a
>non-reactive 50ohm load, and I will have to measure its performance
>into my IF filter, but any light that could be shed on the subject
>would be most appreciated.  Thanks.

>                               [e-mail]
>                               Alan F. Jovanovich
>                               KA7DAT






From Unknown Fri Nov 03 12:26:56 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!lynx.unm.edu!bubba.NMSU.Edu!not-for-mail
From: [e-mail] (beard)
Newsgroups: rec.radio.amateur.homebrew
Subject: WTB: 811 Tubes
Date: 2 Nov 1995 06:59:03 GMT
Organization: New Mexico State University
Lines: 9
Message-ID: <479q7n$[e-mail]>
NNTP-Posting-Host: acca.nmsu.edu
X-Newsreader: TIN [UNIX 1.3 950621BETA PL0]

I need several good 811's.  I prefer NOS or used USA tubes (used is ok
as long as they are good...) I hear the Russian tubes are good.  I will
consider them depending on the price.

Thank you in advance for any responses.

David Beard
WA4QGA



From Unknown Mon Nov 06 21:05:56 1995
Path: news.epix.net!news.sprintlink.net!news.inc.net!news.uoregon.edu!news.emf.net!gatech!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!news.cais.net!news.supernet.net!news.sonetis.com!alpine.valleynet.com!fresno2-07.valleynet.com!kd7s
From: [e-mail] (Bill Jones)
Newsgroups: rec.radio.amateur.homebrew
Subject: RE:"Grid Dippers" and Modern Alternatives
Date: Fri, 3 Nov 1995 14:29:43 MST
Organization: ValleyNet Communications
Lines: 12
Message-ID: <[e-mail]>
NNTP-Posting-Host: 205.199.144.207
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4]

Jim, W8ZR, recently posted a most interesting method of setting the taps on an
inductor in a linear amplifier using the Autek RF-1 RF Analyzer.  It just goes
to show how versitile this instrument really is.

I have used my RF-1 to adjust a 5-pole Chebyshev lowpass filter at the output
of a QRP rig.  I have also used it to construct impedance matching
transformers for interstage coupling in the same QRP rig.  For those who use
this device for nothing more than checking the SWR of your favorite dipole,
you're not gotting your money's worth.

It would be interesting to hear from other RF-1 users with ideas on
how this little device could be put to further use.  Let's hear from you.


From Unknown Mon Nov 06 21:05:57 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!munnari.oz.au!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (David Allen Yanke)
Newsgroups: rec.radio.amateur.homebrew
Subject: (none)
Date: 4 Nov 95 20:24:54 GMT
Organization: ucsd usenet gateway
Lines: 19
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

        Since we're talking about transverters here.... In a 73 mag from
about 1978, ther was a plan for a 2mtr to 220 transverter. It even handled
split properly. The author, who I called and got a really rude response,
listed some parts paks that could only be obtained from him. No luck. Does
anyone know of any plans or have one of these laying around they would like
to part with.
dahdidahdidahdidahdidahdidahdidahdidahdidahdidahdidahdid
a Date : 11/04/95 Time: 12:24:54                       a
h Name:David Allen Yanke  E-mail:[e-mail]  h
d             Member: ARRL/FRRL/IC/PITA                d
i                            RCC                       i
d  "I want to die like my grandfather, quietly, in my  d
a   sleep. Not like his passengers, screaming in       a
h   terror."                                           h
d                                                      d
idahdidahdidahdidahdidahdidahdidahdidahdidahdidahdidahdi





From Unknown Mon Nov 06 21:05:58 1995
Path: news.epix.net!news.sprintlink.net!news.inc.net!uwm.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (The2X4)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: (none)
Date: 6 Nov 1995 04:55:46 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 15
Sender: [e-mail]
Message-ID: <47km32$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <[e-mail]>, [e-mail]
(David Allen Yanke) writes:

>dahdidahdidahdidahdidahdidahdidahdidahdidahdidahdidahdid
>a Date : 11/04/95 Time: 12:24:54                       a
>h Name:David Allen Yanke  E-mail:[e-mail]  h
>d             Member: ARRL/FRRL/IC/PITA                d
>i                            RCC                       i
>d  "I want to die like my grandfather, quietly, in my  d
>a   sleep. Not like his passengers, screaming in       a
>h   terror."                                           h
>d                                                      d
>idahdidahdidahdidahdidahdidahdidahdidahdidahdidahdidahdi

Was this supposed to impress us?


From Unknown Mon Nov 06 21:05:59 1995
Path: news.epix.net!news.sprintlink.net!hookup!usenet.eel.ufl.edu!news.interlog.com!winternet.com!uunet!in1.uu.net!newsfeed.internetmci.com!btnet!dispatch.news.demon.net!demon!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 40m vertical - How to make?
Date: Sat, 04 Nov 95 07:51:29 GMT
Lines: 16
Message-ID: <[e-mail]>
References: <464c9a$[e-mail]> <[e-mail]> <46ggnc$[e-mail]> <[e-mail]> <47d6rc$[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

   [e-mail] () wrote:

>Any antenna near a lossy conductor (such as Earth) will induce a field
>in that conductor. The loss resistance of that lossy parasitic conductor
>will then convert some of the field energy to heat. This *directly*
>reduces the antenna *system* efficiency.

How much greater are the near-field earth losses when a dipole is
oriented vertically rather than horizontally?  Also, how does the
increased loss incurred from vertical polarization compare to the
energy gained from the lowered radiation angle?

73,

Jack  WB3U


From Unknown Mon Nov 06 21:06:00 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 40m vertical - How to make?
Date: 4 Nov 1995 22:11:32 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 37
Sender: [e-mail]
Message-ID: <47ha14$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

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

>How much greater are the near-field earth losses when a dipole is
>oriented vertically rather than horizontally?  Also, how does the
>increased loss incurred from vertical polarization compare to the
>energy gained from the lowered radiation angle?
>
>73,
>
>Jack  WB3U

That's a tough one Jack. There are too many variables to give an exacting
answer.
The higher the field density at a given lossy surface, the more power
lost. The power loss can come from both electric and magnetic field
effects.

Horizontal antennas generally have less loss because they're often placed
higher above earth, "fields" are less concentrated. Even the performance
of fairly high dipoles can be enhanced by adding counterpoise wires. A low
dipole's performance can be greatly improved by adding counterpoise wires.

An end-fed vertical *always* requires some form of electrically neutral
mass to terminate one feedline terminal. That causes additional system I*I
R losses, or even power loss by direct radiation.

A base fed half-wave vertical has this problem, not quite as bad as a
quarter wave vertical, but the loss is still there. That's because the
base impedance of a practical half-wave vertical isn't infinite (for a
thick radiator it can be a few hundred ohms).

All half-wave verticals (even center fed) have strong electric fields at
both ends, that causes E field losses to predominate near the base. But
they also have magnetic field losses.

73 Tom


From Unknown Mon Nov 06 21:06:01 1995
Newsgroups: rec.radio.amateur.equipment,rec.radio.scanner,rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!hodes.com!netcomsv!uu4news.netcom.com!netcomsv!uu3news.netcom.com!ix.netcom.com!netcom.com!jgardner
From: [e-mail] (Jerry Gardner)
Subject: Re: an HT from Hong Kong?
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
X-Newsreader: TIN [version 1.2 PL1]
References: <[e-mail]> <[e-mail]>
Date: Fri, 3 Nov 1995 20:30:07 GMT
Lines: 14
Sender: [e-mail]
Xref: news.epix.net rec.radio.amateur.equipment:21101 rec.radio.scanner:40277 rec.radio.amateur.homebrew:11397

Michael Fogarty ([e-mail]) wrote:

: I am surprised that nobody really seemed to mention the possibilities and
: benefits of expanded frequencies.  Perhaps you're all old timers who've
: gotten the modifiable radios (like my friends), or you don't really care
: to listen in on the verboten bands.  Regardless, I'll have an HT on
: returning from HK or I'll get one here soon thereafter (likely the latter).

Expanded frequency coverage is a compromise. If I want such a compromise,
I'll buy a cheap Radio Shack scanner. I'd rather not made such a compromise
with my ham gear.

--
Jerry Gardner          | Maintainer of the Large Format Digest
[e-mail]    | Send subscription requests to [e-mail]


From Unknown Mon Nov 06 21:06:02 1995
Path: news.epix.net!news.sprintlink.net!news.Edu.TW!news.cc.nctu.edu.tw!serv.HiNet.net!news.uoregon.edu!stallion.jsums.edu!gatech2!pirates!cssun.mathcs.emory.edu!swrinde!cs.utexas.edu!news.ti.com!news.dseg.ti.com!usenet
From: Roger White <rwhite@mw66>
Newsgroups: rec.radio.amateur.homebrew
Subject: ATV Newsgroups
Date: 6 Nov 1995 15:51:54 GMT
Lines: 6
Message-ID: <47lauq$[e-mail]>
NNTP-Posting-Host: mw66.dseg.ti.com
X-Newsreader: NCSA Mosaic

Any newsgroups on ATV Operation (especially UHF/Microwave operation)?

Roger White, AJ5L
[e-mail]




From Unknown Mon Nov 06 21:06:03 1995
Path: news.epix.net!news.sprintlink.net!news.eznet.net!news.enterprise.net!btnet!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Tim Hynde ka8ddz/qrp Rochester, MI )
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ATV North Country Radio (WARNING)
Date: 6 Nov 1995 01:01:20 GMT
Organization: Netcom
Lines: 29
Message-ID: <47jmp0$[e-mail]>
References: <[e-mail]> <478o8d$[e-mail]> <47hj79$[e-mail]>
NNTP-Posting-Host: ix-pon-mi3-11.ix.netcom.com
X-NETCOM-Date: Sun Nov 05  5:01:20 PM PST 1995

In <47hj79$[e-mail]> Mark Castiglione <[e-mail]>
writes:
>
>[e-mail] (The2X4) wrote:
>>Thanks your warning came in time. I was gonna get
>>one of their ATV 's.
>>
>>Thansk.......................
>>
>>Carl
>
>Hold on on minute Partner..I have one of their kits ..
>The 5 watt transeiver kit..I was the one to originate
>the query on the kit..I received a few answers and
>they wwere all positive.And so far the kit is
>working Okay..I am in the prossess of tuning it.
>Send out a query of your own..As for the guy who l
>lost his radio..???I never  knew they repaired
>radios...Thats it for now..73  Mark N8REZ
>

Interesting, I put a query out regarding this kit about the same time
as you aparently, I look forward to hearing from you, the responces I
read were mixed. One indicated he had built several kits, some worked
some didnt. Hope you have success and write about it!

73,

Tim


From Unknown Mon Nov 06 21:06:04 1995
Path: news.epix.net!news.sprintlink.net!simtel!lll-winken.llnl.gov!uwm.edu!vixen.cso.uiuc.edu!sdd.hp.com!col.hp.com!news.cis.okstate.edu!news.ecn.uoknor.edu!news.uoknor.edu!usenet
From: matthew huston <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: basic pirate radio help
Date: 4 Nov 1995 20:54:25 GMT
Organization: university of oklahoma
Lines: 10
Message-ID: <47gju1$[e-mail]>
References: <[e-mail]> <46rfqg$[e-mail]> <471mk2$[e-mail]>
NNTP-Posting-Host: blmac22.lib.uoknor.edu
Mime-Version: 1.0
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Content-Transfer-Encoding: 7bit
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To: [e-mail]
X-URL: news:471mk2$[e-mail]

Hello! forgive my ignorance if your an electrical engineeer, but I am in
the process of constructing a low power fm transmitter. the hideous
quality of current programming in this area has become too much to
endure. If you could help out by giving me some info on where to find
books on transmitter production it would be greatly appreciated. I have
some knowledge of electronics, but in no way can wire by schematic
alone. just wondering if there was some underground manual, sort of a
volkswagen repair manual for idiots book that could get me started.




From Unknown Mon Nov 06 21:06:05 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!btnet!dispatch.news.demon.net!demon!yorks.demon.co.uk!yorks
From: Frank G3YCC <yorks@frank>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: Crystal CW Rig - Help!
Date: Sun, 5 Nov 1995 14:36:30 +0000
Organization: Uk
Lines: 18
Distribution: world
Message-ID: <[e-mail]>
References: <47d81r$[e-mail]>
Reply-To: Frank G3YCC <frank@yorks>
NNTP-Posting-Host: yorks.demon.co.uk
X-NNTP-Posting-Host: yorks.demon.co.uk
MIME-Version: 1.0
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Xref: news.epix.net rec.radio.amateur.homebrew:11405 rec.radio.amateur.misc:93908

In article <47d81r$[e-mail]>, Eric Jacksch <[e-mail]>
writes
>Hello all!
>
>I'm still looking for schematics for a very simple, single freqency
>crystal controlled 8m cw transmitter and/or receiver.  I have found
>lots of fancy, tunable units, etc...what I need is a very stable,
>one frequency unit.  It's for telemetry - low power is fine!
>
>Email to [e-mail] would be greatly appreciated.
>
>Thanks,
>Eric.
Did you really mean 8m?
--
Frank G3YCC (G QRP 042)
Email: [e-mail]


From Unknown Mon Nov 06 21:06:06 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Tim Hynde ka8ddz/qrp Rochester, MI )
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: Crystal CW Rig - Help!
Date: 6 Nov 1995 00:51:03 GMT
Organization: Netcom
Lines: 21
Message-ID: <47jm5n$[e-mail]>
References: <47d81r$[e-mail]> <[e-mail]>
NNTP-Posting-Host: ix-pon-mi3-11.ix.netcom.com
X-NETCOM-Date: Sun Nov 05  4:51:03 PM PST 1995
Xref: news.epix.net rec.radio.amateur.homebrew:11411 rec.radio.amateur.misc:93928


>In article <47d81r$[e-mail]>, Eric Jacksch <[e-mail]>
>writes
>>Hello all!
>>
>>I'm still looking for schematics for a very simple, single freqency
>>crystal controlled 8m cw transmitter and/or receiver.  I have found
>>lots of fancy, tunable units, etc...what I need is a very stable,
>>one frequency unit.  It's for telemetry - low power is fine!
>>
>>Email to [e-mail] would be greatly appreciated.
>>
>>Thanks,
>>Eric.

Have you considred the ARRL handbook or W1FB's QRP book, they both have
a plethora of low power CW transmitter schematics.

Best wishes,

Tim


From Unknown Mon Nov 06 21:06:06 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!solaris.cc.vt.edu!swiss.ans.net!prodigy.com!usenet
From: [e-mail] (William Hampsmire)
Newsgroups: rec.radio.amateur.homebrew
Subject: fujitsu 10 uhf commercial radio
Date: 4 Nov 1995 09:39:34 GMT
Organization: Prodigy Services Company  1-800-PRODIGY
Lines: 6
Distribution: world
Message-ID: <47fccm$[e-mail]>
NNTP-Posting-Host: inugap3.news.prodigy.com
X-Newsreader: Version 1.2

does anyone know how to convert this radio to amatuer use.
thanks
-
  WILLIAM HAMPSMIRE  [e-mail]




From Unknown Mon Nov 06 21:06:07 1995
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!math.ohio-state.edu!pacific.mps.ohio-state.edu!freenet.columbus.oh.us!not-for-mail
From: [e-mail] (Doug Bosch)
Newsgroups: rec.radio.amateur.homebrew
Subject: Halicrafters S40A
Date: 5 Nov 1995 13:21:52 -0500
Organization: The Greater Columbus FreeNet
Lines: 13
Message-ID: <47ivc0$[e-mail]>
NNTP-Posting-Host: acme.freenet.columbus.oh.us
X-Newsreader: TIN [version 1.2 PL2]


        Have any inforamtion or suggestions?

        I am currently trying to resolve a "hum" problem with my 1946 s40a
by replacing capcitors that show visual signs of failure, such as leaking,
and all electrolitics.  The problem I am having is locating a resource for
suitable capacitors.  Due to the ratings of these capacitors the search
has been a frustrating one.  Does anyone know of a great place to find a
"huge" assortment of capacitors that will accomodate specifications of
this era?

        thnks in advance.  doug



From Unknown Mon Nov 06 21:06:08 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!nwnews.wa.com!news1.halcyon.com!coho!ki7zd
From: [e-mail] (Randy Seacat)
Newsgroups: rec.radio.amateur.homebrew
Subject: HELP FINDING KIT PLEASE!
Date: 4 Nov 1995 08:52:48 GMT
Organization: Northwest Nexus Inc.
Lines: 20
Message-ID: <47f9l0$[e-mail]>
NNTP-Posting-Host: coho.halcyon.com


Hi there,

My 12 year old son is about to become a ham, like myself and his grandfather.

Grandad and me have decided that we want to get him a kit to build, but
we have yet to find a decent one. We would like multi bands (3?) and qrp.

Phone would be a plus, but we dont want to spend a fortune.

Any ideas?

He will have Tech+ privs here in the states.


--
/-/-/  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  | Amateur Radio Station                       Inet: [e-mail]
  | KI7ZD
  | WWA  CN87  73's    _._ .. __... __.. _..   "If RST > 519, Reduce Power!"


From Unknown Mon Nov 06 21:06:09 1995
Path: news.epix.net!news.sprintlink.net!news.Edu.TW!news.cc.nctu.edu.tw!serv.HiNet.net!news.uoregon.edu!news.dacom.co.kr!newsfeed.internetmci.com!in2.uu.net!noc.near.net!sunfish.hi.com!brainiac.hi.com!user
From: [e-mail] (Steve Byan)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: help w/ headphones
Date: Mon, 06 Nov 1995 12:17:38 -0400
Organization: Hitachi Computer Products, Inc.
Lines: 15
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: brainiac.hi.com

> Hello out there.  I built a small crystal radio, and I need some 2000 Ohm
> headphones for it.

high impedance double headset (2000 ohms) #PA-466  $13.99
crytal earphone #PA-480  $2.50

from
Antique Electronics Supply
[phone]

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


From Unknown Mon Nov 06 21:06:10 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!ulowell.uml.edu!vtc.tacom.army.mil!news2.acs.oakland.edu!detroit.freenet.org!detroit.freenet.org!rburgan
From: [e-mail] (Roland B. Burgan)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: help w/ headphones
Date: 6 Nov 1995 20:37:20 GMT
Organization: The Greater Detroit Free-Net
Lines: 9
Message-ID: <47lrm0$[e-mail]>
NNTP-Posting-Host: detroit.freenet.org


Try :

FAIR RADIO
Lima, Ohio


(they deal in surplus electronics)
--


From Unknown Mon Nov 06 21:06:11 1995
Path: news.epix.net!news.sprintlink.net!in2.uu.net!news.interlog.com!news1.toronto.fonorola.net!news2.compulink.com!tubegod
Newsgroups: rec.radio.amateur.homebrew,sci.electronics
From: [e-mail] (Andy Moss)
Subject: Re: How does a "circulator" work?
Followup-To: rec.radio.amateur.homebrew,sci.electronics
X-Newsreader: TIN [version 1.2 PL2]
Organization: ComputerLink Online Inc.
X-Client-Port: 1150
Message-ID: <[e-mail]>
References: <47a3ee$[e-mail]>
X-Nntp-Posting-Host: cml.com
Date: 5 Nov 95 17:51:59 GMT
Sender: [e-mail]
Lines: 30
Xref: news.epix.net rec.radio.amateur.homebrew:11408 sci.electronics:158539

Douglas Braun ([e-mail]) wrote:
: There is a nifty RF device called a "circulator".  It has three terminals.
: RF energy fed into terminal A comes out terminal B, energy fed into terminal
: B comes out terminal C, and energy fed into terminal C comes out terminal A.

I can't explain the theory but it's a sandwich of three metal discs and two
disc-shaped magnets.  The strength of the magnets has everything to do with
the frequency at which it will pass RF.  The size of the magnets has
everything to do with how much power you can pump through it.  Like anything
involving a magnet, it is prone to saturation when high powers are involved.
Most professional isolators (Celwave, Sinclair etc.) can handle 150Watts+.
Typical insertian losses for single-isolators are 1dB.

They are available for any frequency band.

: I am trying to connect a transverter to a HF radio (TS-50) without a
: seperate transverter connection, and one of these could elegantly solve
: the T/R switching problem...

Excellent idea.  If you want a much better description, write my friend
Jon at: "[e-mail]" and tell him "tubegod"  sent you.


Cheers!

Andy

 -------------------------------------------------------------------------
 : Stop for a drink at the Internet TeleCafe: telnet://telecafe.com:9000 :
 -------------------------------------------------------------------------


From Unknown Mon Nov 06 21:06:12 1995
Path: news.epix.net!news.sprintlink.net!news00.sunet.se!sunic!news99.sunet.se!news.funet.fi!news.cc.tut.fi!proffa.cc.tut.fi!not-for-mail
From: [e-mail] (Kein{nen Paul)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How to determine dBm when driving diode mixers with square waves
Date: 4 Nov 1995 16:45:40 +0200
Organization: Tampere University of Technology
Lines: 33
Distribution: world
Message-ID: <47fuak$[e-mail]>
References: <[e-mail]> <[e-mail]> <4769lr$[e-mail]>
NNTP-Posting-Host: proffa.cc.tut.fi


Carl Gregory <[e-mail]> wrote:

> BTW, I think that if you use a square-wave,
> the peak drive voltage can be lower for equal efficiency.
> A sinewave drive should be high-enough level so that it
> is significantly clipped by the mixer (thus becoming a square wave).
> Think of it as a valve which turns on when the drive exceeds the threshold.
> If the valve only turns on for a small fraction of a cycle,
> you won't get mch water (signal) through it).

A related question, how does the duty cycle (if not exactly 50 %) affect
the dbm performance (particulary spurious response) ? If the oscillator or
buffer clips the other half-wave of the sine-wave a bit, the zero crossings
in the AC-coupled LO-port no longer happen at exactly 0 and 180 degree,
thus changing the duty cycle.

Should the LO-injection be low-pass (or even band-pass) filtered to
restore perfectly equal duty cycle?

How would this affect mixer performance, when the leakage from the
RF-port to the LO-port will find something that is radically different
from 50 ohms resistive. Should the low-pass filter at the LO-port be
T- or pi-configuration representing a high resp. low. impedance for the
high frequency leakage from the LO-port.

                Paul OH3LWR

--
Phone   : [phone]                       Mail: Hameenpuisto 42 A 26
Internet: [e-mail]                      FIN-33200 TAMPERE
Telex   : 58-100 1825 (ATTN: Keinanen Paul)            FINLAND
X.400   : G=Paul S=Keinanen O=Kotiposti A=ELISA C=FI


From Unknown Mon Nov 06 21:06:13 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (William Houston)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: KA7DAT and Input/output intercept point of diode mixer.
Date: 4 Nov 1995 18:56:30 GMT
Organization: Your Organization
Lines: 23
Distribution: world
Message-ID: <47gd0u$[e-mail]>
References: <474up5$[e-mail]>
NNTP-Posting-Host: ix-sd11-04.ix.netcom.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-NETCOM-Date: Sat Nov 04 10:56:30 AM PST 1995
X-Newsreader: WinVN 0.99.6

In article <474up5$[e-mail]>, [e-mail] says...
>
>If two tones, each at +8 dBm at the input, produce IMD equal to
>+8 dBm (the intercept point) then at the mixer output the two tones
>are -1.3 dB and the IMD is also -1.3 dBM. Using the definition of
>intercept point, the OIP3 is -1.3 and the IIP3 is +8 dBm. Bill Sabin W0IYH
>
Hi Guys,
In an earlier post I asked the question "don't you mean two +5dBm tones?".  Someone responded that this was
wrong and that it is only important to consider one of the tones.  Alas, my news server seems to have dropped
my post as well as this one.  First, if the manufacturer of the mixer is stating the intercept point they are
referring to the total power at which this occurs.  Why?  Lets ask this question....what would be the
performance of the mixer with two tones of uneven power?  What would be the performance with a complex signal?
 Sure, when you perform a "two-tone" test on a device you might measure the intermod rejection from one of the
input tones to one of the third order products.  What do you do if one of the third order products is smaller
than the other?  How do make this information useful?  You have to consider the total power.  Therefore, if
the intercept point occurs at +8dBm then the manufacturer must have been using two tones of +5dBm each.
Otherwise, the powerlevel would have been correctly stated as being 3dB higher.  Of course, any of you who
have performed intermod measurements would know that the manufacturer used tones which were much smaller than
+5dBm each while measuring this mixer!

73 William N6AGV



From Unknown Mon Nov 06 21:06:14 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (William Houston)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: KA7DAT and Input/output intercept point of diode mixer.
Date: 5 Nov 1995 06:59:09 GMT
Organization: Your Organization
Lines: 51
Distribution: world
Message-ID: <47hnbt$[e-mail]>
References: <474up5$[e-mail]> <47gd0u$[e-mail]>
NNTP-Posting-Host: ix-sd9-20.ix.netcom.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-NETCOM-Date: Sat Nov 04 10:59:09 PM PST 1995
X-Newsreader: WinVN 0.99.6

In article <47gd0u$[e-mail]>, [e-mail] says...
>
>In article <474up5$[e-mail]>,
[e-mail] says...
>>
>>If two tones, each at +8 dBm at the input, produce IMD equal to
>>+8 dBm (the intercept point) then at the mixer output the two tones
>>are -1.3 dB and the IMD is also -1.3 dBM. Using the definition of
>>intercept point, the OIP3 is -1.3 and the IIP3 is +8 dBm. Bill Sabin W0IYH
>>
>>>Hi Guys,
>In an earlier post I asked the question "don't you mean two +5dBm tones?".
Someone responded that this was
>wrong and that it is only important to consider one of the tones.  Alas, my
news server seems to have dropped
>my post as well as this one.  (snip)

Hi guys,
I was wrong and the following message from Bill Sabin jarred me back to
reality!  Here is what he "VERY
correctly" had to say on the subject!

The IIP3 is specified in terms of two equal tones as a matter of
custom so that everyone knows what the standard conditions are.
If the IIP3 is specified at +8dBm, then each tone is +8dBm and
at that level the IMD products would also be +8dBm if the mixer
were still linear at that signal level. By linear I mean that gain
compression has not occurred.  But because the mixer is not linear
at that input level the test is performed at a lower level where
the mixer has not yet gone into gain compression.  For example
they might use -10dBm per tone.  The IIP3 is then calculated from a formula
IIP3(dBM)= SIG(dBM) + 0.5*S/D(dB) where SIG is the level/tone of the
two equal test signals and S/D is the ratio, in dB, of each signal to
each distortion product.  The IIP3 value is the level of each of the
two equal tones. Page 17.6 of the ARRL Handbook 1995/1996 editions
gives a discussion that gives more details.  If the tones are not
equal then some special mathematical analysis is needed which I
will not have time to get into.

Thanks Bill

my apologies for any confusion I may have caused!

73 William N6AGV









From Unknown Mon Nov 06 21:06:16 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!usc!math.ohio-state.edu!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (William Houston)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: KA7DAT and Input/output intercept point of diode mixer.
Date: 5 Nov 1995 06:06:28 GMT
Organization: Your Organization
Lines: 41
Distribution: world
Message-ID: <47hk94$[e-mail]>
References: <474up5$[e-mail]> <47gd0u$[e-mail]>
NNTP-Posting-Host: ix-sd10-01.ix.netcom.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-NETCOM-Date: Sat Nov 04 10:06:28 PM PST 1995

In article <47gd0u$[e-mail]>, [e-mail]╢ says...
>
>In article <474up5$[e-mail]>, [e-mail] says...
>>
>>If two tones, each at +8 dBm at the input, produce IMD equal to
>>+8 dBm (the intercept point) then at the mixer output the two tones
>>are -1.3 dB and the IMD is also -1.3 dBM. Using the definition of
>>intercept point, the OIP3 is -1.3 and the IIP3 is +8 dBm. Bill Sabin W0IYH
>>
>Hi Guys,
>In an earlier post I asked the question "don't you mean two +5dBm tones?".  Someone responded that this was
>wrong and that it is only important to consider one of the tones.  Alas, my news server seems to have dropped
>my post as well as this one.  (snip)

Hi guys,
I was wrong and the following message from Bill Sabin jarred me back to reality!  Here is what he "VERY
correctly" had to say on the subject!

The IIP3 is specified in terms of two equal tones as a matter of
custom so that everyone knows what the standard conditions are.
If the IIP3 is specified at +8dBm, then each tone is +8dBm and
at that level the IMD products would also be +8dBm if the mixer
were still linear at that signal level. By linear I mean that gain
compression has not occurred.  But because the mixer is not linear
at that input level the test is performed at a lower level where
the mixer has not yet gone into gain compression.  For example
they might use -10dBm per tone.  The IIP3 is then calculated from a formula
IIP3(dBM)= SIG(dBM) + 0.5*S/D(dB) where SIG is the level/tone of the
two equal test signals and S/D is the ratio, in dB, of each signal to
each distortion product.  The IIP3 value is the level of each of the
two equal tones. Page 17.6 of the ARRL Handbook 1995/1996 editions
gives a discussion that gives more details.  If the tones are not
equal then some special mathematical analysis is needed which I
will not have time to get into.

Thanks Bill

my apologies for any confusion I may have caused!

73 William N6AGV



From Unknown Mon Nov 06 21:06:17 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (William Houston)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: KA7DAT and Input/output intercept point of diode mixer.
Date: 5 Nov 1995 06:54:13 GMT
Organization: Your Organization
Lines: 44
Distribution: world
Message-ID: <47hn2l$[e-mail]>
References: <474up5$[e-mail]> <47gd0u$[e-mail]>
NNTP-Posting-Host: ix-sd9-20.ix.netcom.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-NETCOM-Date: Sat Nov 04 10:54:13 PM PST 1995
X-Newsreader: WinVN 0.99.6

In article <47gd0u$[e-mail]>, [e-mail] says...
>
>In article <474up5$[e-mail]>, [e-mail] says...
>>
>>If two tones, each at +8 dBm at the input, produce IMD equal to
>>+8 dBm (the intercept point) then at the mixer output the two tones
>>are -1.3 dB and the IMD is also -1.3 dBM. Using the definition of
>>intercept point, the OIP3 is -1.3 and the IIP3 is +8 dBm. Bill Sabin W0IYH
>>
>>Hi Guys,
>In an earlier post I asked the question "don't you mean two +5dBm tones?".  Someone responded that this was
>wrong and that it is only important to consider one of the tones.  Alas, my news server seems to have dropped
>my post as well as this one.  (snip)

Hi guys,
I was wrong and the following message from Bill Sabin jarred me back to reality!  Here is what he "VERY
correctly" had to say on the subject!

The IIP3 is specified in terms of two equal tones as a matter of
custom so that everyone knows what the standard conditions are.
If the IIP3 is specified at +8dBm, then each tone is +8dBm and
at that level the IMD products would also be +8dBm if the mixer
were still linear at that signal level. By linear I mean that gain
compression has not occurred.  But because the mixer is not linear
at that input level the test is performed at a lower level where
the mixer has not yet gone into gain compression.  For example
they might use -10dBm per tone.  The IIP3 is then calculated from a formula
IIP3(dBM)= SIG(dBM) + 0.5*S/D(dB) where SIG is the level/tone of the
two equal test signals and S/D is the ratio, in dB, of each signal to
each distortion product.  The IIP3 value is the level of each of the
two equal tones. Page 17.6 of the ARRL Handbook 1995/1996 editions
gives a discussion that gives more details.  If the tones are not
equal then some special mathematical analysis is needed which I
will not have time to get into.

Thanks Bill

my apologies for any confusion I may have caused!

73 William N6AGV






From Unknown Mon Nov 06 21:06:19 1995
Path: news.epix.net!news.sprintlink.net!news.cici.com!news
From: [e-mail] (Peter D.Richeson)
Newsgroups: rec.radio.amateur.homebrew
Subject: link rep. controler
Date: 5 Nov 1995 22:27:40 GMT
Organization: Starbase1
Lines: 11
Message-ID: <47jdos$[e-mail]>
NNTP-Posting-Host: starbase1.cici.com
Mime-Version: 1.0
X-Newsreader: WinVN 0.99.4

does any one know of a good low cost controler for a remote reciever
rep.  all it needs to do is id and time out.
--
.      '''
.     (o o)
___ooO-(_)-Ooo________________________________________________________
Peter D. Richeson                    | "I don't believe in a no-win   |
Email: [e-mail]             |  scenaro."                     |
http://www.cici.com/~richesop        |    - Admiral James T. Kirk     |
----------------------------------------------------------------------



From Unknown Mon Nov 06 21:06:19 1995
Path: news.epix.net!news.sprintlink.net!castle.nando.net!news
From: Dave Hockaday <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: link rep. controler
Date: 6 Nov 1995 15:18:03 GMT
Organization: News & Observer Public Access
Lines: 14
Message-ID: <47l8vb$[e-mail]>
References: <47jdos$[e-mail]>
NNTP-Posting-Host: grail1316.nando.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)
To: [e-mail]

>does any one know of a good low cost controler for a remote reciever
>rep.  all it needs to do is id and time out.

I like the RC-100 by MCC. They are about $150 and are very versatile. You could
actually install rx's on 2 bands at the same site, voice ID's the link, cw id the
link, and have full remote control of the link (which is nice when you're trying to
figure out where a problem is sometimes, heehee). You can also program a beep on
your link tx back to the main site to id it as being a signal from the remote.

73 de WB4IUY

PS...Micro Computer Concepts advertises in the ham mags with an add for their full
blown controller/patch for $249 or so.



From Unknown Mon Nov 06 21:06:21 1995
Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!chi-news.cic.net!uwm.edu!lll-winken.llnl.gov!decwrl!pacbell.com!amdahl.com!amd!netcomsv!uu4news.netcom.com!netcomsv!uu3news.netcom.com!ix.netcom.com!netnews
From: [e-mail] (Jeff Anderson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: LO Drive to SL6440: Was (Re: diode mixer drive level)
Date: 4 Nov 1995 15:29:29 GMT
Organization: Netcom
Lines: 67
Message-ID: <47g0sp$[e-mail]>
References: <472iah$[e-mail]> <[e-mail]> <47e939$[e-mail]>
NNTP-Posting-Host: ix-pa9-22.ix.netcom.com
X-NETCOM-Date: Sat Nov 04  7:29:29 AM PST 1995

In <47e939$[e-mail]> Roger L Traylor
>
>I understand the theory behind this and attempted to try out a real
>world case.  I drove a SL6440 (active mixer-Gilbert cell type) with a
>clean signal in the RF port.  To the LO port I tried a crystal
>oscillator with filtering and with filtering disabled.
>The filtered output from the oscillator had harmonics that were down
>at least 30db from the fundamental.  Unfiltered, harmonics were down
>very little.
>
>With the clean LO, the results  were as expected; translation of the
>RF signal at its fundamental and at harmonics.  At the harmonics
>of the LO however, signal levels were down greatly.
>
>With the unfiltered LO, almost all sum and difference products were
>at the same amplitude!  It looked like a mess of signals on the spectrum
>analyzer.
>
>Is there some fundamental difference (beyond the obvious) in how these
>two mixers work?  I feel better when I see some correlation between
>theory and practice.

    I had to dig around a little to find my class notes on Gilbert cell
multipliers.  After blowing off 18 years of accumulated dust, here is a brief
summary of three different ways to apply them.

1.  If the input signals are kept small enough, the multiplier acts as
    a true linear four-quadrant multiplier.  The output is proportional
    to the multiplication of the two inputs.

2.  Increasing one of the signals to large enough levels essentially
    "squares it up", and you end up multiplying the low level signal
    by a square wave.  This is similar in concept to the diode ring
    mixers previously discussed on the list.  The advantage here is
    that you maximize your conversion gain, although with the
    disadvantage that you produce mixing products with all of
    the square-wave's harmonics.

3.  The third application of the Gilbert cell mulitplier is as a
    phase detector.  In this case both inputs are run with high
    level signals, and the output is a square wave (functionally,
    this operates just like an XOR gate).

    From Roger's description, it sounds as though the SL6440 is
operating under the conditions described in "1" above.  That is, if we
are multiplying sine by sine, we'd expect the sum and difference
products related to those two signals, and minimal (as spec'd by the
multiplier) distortion products.  However, if one of the signals is
"pre-distorted" (unfiltered, in this case), then we should see sum and
difference products with all of the harmonics too.  In Roger's case,
the level of the unfiltered LO's harmonics were "down very little" from
the fundamental, so the product terms with these harmonics should also
be down very little, which is consistent with Roger's observations.

    If we were operating in case 2, then I'd expect the level of the
harmonic product terms to be the same, irrespective of input filtering.

    Someone on the list may have a data sheet for the SL6440 -- what
levels do they recommend for the inputs?  And do they discuss the
multiplier's operation (is the LO signal "squared up"?).

    - Jeff, WA6AHL


By the way - for those interested, there is a good analysis of Gilber
Cell Multipliers in the book "Analysis and Design of Analog Integrated
Circuits", by Gray and Meyer (published by Wiley).


From Unknown Mon Nov 06 21:06:22 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!newsfeed.internetmci.com!usenet.eel.ufl.edu!col.hp.com!news.dtc.hp.com!hplextra!hplb!hpwin055.uksr!hpqmoea!dstock
From: [e-mail] (David Stockton)
Subject: Re: LO Drive to SL6440: Was (Re: diode mixer drive level)
Sender: [e-mail] (SQF News Admin)
Message-ID: <[e-mail]>
Date: Mon, 6 Nov 1995 11:16:00 GMT
References: <47e939$[e-mail]>
Nntp-Posting-Host: hpqmocc.sqf.hp.com
Organization: Hewlett-Packard LTD, South Queensferry, Scotland
X-Newsreader: TIN [version 1.1 PL8.8]
Lines: 34

Roger L Traylor ([e-mail]) wrote:
: [e-mail] (David Stockton) wrote:
: >
: >    Just one final remark;  A lot of people, on hearing of squarewave LO
: > drive for ring mixers, rebel, thinking that it will make loads of unwanted
: > mixing products due to the much larger harmonic content of the LO
: > waveform. This is not so, as switching action in the diodes does this
: > anyway even with a sinusoidal voltage drive. Going to a full squarewave
: > LO port driver makes only a small difference.
: >
: >

: I understand the theory behind this and attempted to try out a real
: world case.  I drove a SL6440 (active mixer-Gilbert cell type) with a
: clean signal in the RF port.  To the LO port I tried a crystal
: oscillator with filtering and with filtering disabled.
: The filtered output from the oscillator had harmonics that were down
: at least 30db from the fundamental.  Unfiltered, harmonics were down
: very little.

: With the clean LO, the results  were as expected; translation of the
: RF signal at its fundamental and at harmonics.  At the harmonics
: of the LO however, signal levels were down greatly.

: With the unfiltered LO, almost all sum and difference products were
: at the same amplitude!  It looked like a mess of signals on the spectrum
: analyzer.

: Is there some fundamental difference (beyond the obvious) in how these
: two mixers work?  I feel better when I see some correlation between
: theory and practice.

: Roger Traylor
: [e-mail]


From Unknown Mon Nov 06 21:06:23 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!news.uiowa.edu!not-for-mail
From: [e-mail] (John Stroppel)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: need 2N-3641
Date: 6 Nov 1995 21:32:18 GMT
Organization: University of Iowa, Iowa City, IA, USA
Lines: 13
Distribution: world
Message-ID: <47lut2$[e-mail]>
References: <47ltmc$[e-mail]>
NNTP-Posting-Host: franklin.uhl.uiowa.edu
X-Newsreader: TIN [UNIX 1.3 950515BETA PL0]


Richard:

   Have you checked the other components out in the circuit? Something
else could be running a muck.

John

--
 John Stroppel                         | Internet: [e-mail]
 The University of Iowa - Hygienic Lab | Amateur Radio: WA0VYZ
 Oakdale Research Campus, OH-M7A       | Voice:    [phone]
 Iowa City, IA   52242                 | Fax:      [phone]


From Unknown Mon Nov 06 21:06:24 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!solaris.cc.vt.edu!newsrelay.netins.net!news-feed-1.peachnet.edu!pirates!cssun.mathcs.emory.edu!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Need info on Siemens PD 4435
Message-ID: <[e-mail]>
Organization: Destructive Testing Systems
Date: Mon, 6 Nov 1995 03:41:52 GMT
Lines: 11

Subject says it all. I came across some front panel display
boards today at a hamfest. They have Siemens PD 4435 dot
matrix LED displays on board. I'd like to use these displays
in a project. Anyone have data? Pin outs, drive current?

Gary
--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |


From Unknown Mon Nov 06 21:06:25 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!btnet!dispatch.news.demon.net!demon!mail2news.demon.co.uk!relay-4.mail.demon.net
From: Michael J Wooding <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: VHF Communications Magazine
Date: Sat, 04 Nov 1995 19:27:54 GMT
Organization: None
Lines: 26
Message-ID: <[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: relay-4.mail.demon.net
X-Broken-Date: Saturday, Nov 04, 1995 19.27.54
X-Newsreader: Newswin Alpha 0.7

Hi there,

Yes I am afraid its me again - but initiating my own thread!!!

I now I cannot compete with HRT - heaven forbid! - but for all those
who might be interested we have arrived on the Web!

Our Web pages can be found at:

http://www.taynet.co.uk/~gdx/ag/vhfcomm.htm

Initially our pages are quite simple, in order to guage response etc.
So, please let me have your comments (not too unkind please!) and
suggestions and I will see what can be done.

Even better - how about subscribing!!!!!!

73 ... Mike
--
Michael J Wooding   [e-mail]
CompuServe: 100441,377
Tel: [phone]   Fax: [phone]
KM Publications, 5 Ware Orchard, Barby, Nr.Rugby, CV23 8UF, UK
VHF Communications Magazine - Especially Covering VHF, UHF and Microwaves



From Unknown Mon Nov 06 21:06:26 1995
Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!ultrix.FOUR.net!four.net!jjesse
From: [e-mail] (Jon Jesse)
Newsgroups: rec.radio.amateur.homebrew
Subject: VLF Voltage Probe?
Date: 6 Nov 1995 16:00:04 GMT
Organization: FOURnet Information Network [phone]
Lines: 10
Message-ID: <47lbe4$[e-mail]>
NNTP-Posting-Host: psycho.four.net
X-Newsreader: TIN [version 1.2 PL1]

Hello,
I wanted to try some VLF DXing this winter and while thumbing through
some old mags, I saw an aticle for a "voltage probe".. It concentrated
on imped. matching rather than high gain.  Trouble is, no diagram or
parts list.  Does anyone have a diagram for a VLF voltage probe?

Thanks and 73...
Jon...WS1K...
[e-mail]



From Unknown Mon Nov 06 21:06:27 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news2.realtime.net!bga.com!ftp.unisql.com!unisql.unisql.com!news
From: Jim Strohm <jstrohm@blazer>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WANTED INFO: How to build modems.
Date: 6 Nov 1995 18:04:37 GMT
Organization: UniSQL, Inc.
Lines: 7
Message-ID: <47linl$[e-mail]>
References: <1995Nov4.100849@topaz>
NNTP-Posting-Host: blazer.unisql.com
X-Newsreader: NCSA Mosaic

Have you given any consideration to a DSP-based product that would
work essentially with any signal, and do your product differentiation
based on software?

Jim N6OTQ




From Unknown Mon Nov 06 21:06:28 1995
Path: news.epix.net!news.sprintlink.net!castle.nando.net!news
From: Dave Hockaday <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WTB: C2 air variable capacitor
Date: 6 Nov 1995 15:19:57 GMT
Organization: News & Observer Public Access
Lines: 10
Message-ID: <47l92t$[e-mail]>
References: <47h03u$[e-mail]>
NNTP-Posting-Host: grail1316.nando.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)
To: [e-mail]

>Hi!  I need a 500 up to a 2000 picofarad air variable suitable for linear
>project.  Check your junque boxes gentlemen.
>
>Thanks and 73 de John, WA5TWL....

Hi John....got one...or two, or three :-). What voltage?? What is the power out of
your amp??

73 de WB4IUY



From Unknown Mon Nov 06 21:06:29 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!plug.news.pipex.net!pipex!tank.news.pipex.net!pipex!news.mathworks.com!newsfeed.internetmci.com!chi-news.cic.net!usc!nic-nac.CSU.net!cello.gina.calstate.edu!cello.gina.calstate.edu!not-for-mail
From: [e-mail] (William A Moyes)
Newsgroups: rec.radio.amateur.homebrew,sci.electronics
Subject: WWVB reciever?
Date: 5 Nov 1995 23:17:14 -0800
Organization: GINA and CORE+ Services of The California State University
Lines: 9
Message-ID: <47kcpq$[e-mail]>
NNTP-Posting-Host: cello.gina.calstate.edu
Xref: news.epix.net rec.radio.amateur.homebrew:11412 sci.electronics:158582

        Does anyone have a schematic of a WWVB reciever?  I want to use
it to sync several computers/microcontrollers for some experments
(basically a frequency refrence).  Something that can also decode the
current time would be an added bonus. Thanks.

                        -William Moyes
                        [e-mail]




From Unknown Sat Nov 11 07:03:57 1995
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!catseye.bluemarble.net!usenet.ucs.indiana.edu!vixen.cso.uiuc.edu!uwm.edu!chi-news.cic.net!newsfeed.internetmci.com!in1.uu.net!newsfeed.pitt.edu!dsinc!news.enter.net!usenet
From: Ken Florence <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: (no subject)
Date: Wed, 08 Nov 1995 22:08:01 -0800
Organization: ENTER.NET
Lines: 8
Message-ID: <[e-mail]>
NNTP-Posting-Host: ppp0.enter.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b1 (Windows; I; 16bit)
Xref: news.epix.net rec.radio.amateur.homebrew:11467 rec.radio.amateur.misc:94068

I would like to build an antenna tuner for 2 meters and 220.
Something that works on both, or plans for a unit to wrk one or
the other wud be great. Can anyone point me to a book or
magazine article on the above? Only needs to handle 100 watts or
so. Thanks.
--
Ken Florence  KA3PLS
[e-mail]


From Unknown Sat Nov 11 07:03:58 1995
Path: news.epix.net!news.sprintlink.net!simtel!chi-news.cic.net!newsfeed.internetmci.com!psgrain!fizban.solace.mh.se!demos!news.uni-stuttgart.de!moritz
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 40m vertical - How to make?
Date: 7 Nov 1995 17:05:46 GMT
Organization: Comp.Center (RUS), U of Stuttgart, FRG
Lines: 6
Message-ID: <47o3la$[e-mail]>
References: <464c9a$[e-mail]> <[e-mail]> <47d6rc$[e-mail]> <[e-mail]>
NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de

Gary,

see in rec.radio.amateur.antenna for an answer!

73, Moritz DL5UH



From Unknown Sat Nov 11 07:03:59 1995
Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!minfox!tom.alldread
From: [e-mail] (Tom Alldread)
Newsgroups: rec.radio.amateur.homebrew
Subject: ? PLL VCO TECHNOLOGY ?
Date: Wed,  8 Nov 1995 15:20:00 GMT
Message-ID: <[e-mail]>
Organization: MINFOX Courtenay, BC (604)-337-2023
Distribution: world
Lines: 23


Greetings:

        I have been reviewing the technical data on the National
Semiconductor LMX1501A frequency synthesizer chip. Does anyone know of
companion VCO chips? The documentation suggests that muRata
and M/A Com manufacture a line of VCOs compatible to the LMX1501A. I
wonder what VFO frequency ranges are available and if there are any that
operate in the 10-100 MHz frequency range?

        The literature suggests single chip VCOs are available in a
surface mount package that operate in the 800 MHz range. The only
external components are for the loop low pass filter. The oscillator
gain block, resonant components and varicap diodes all appear to be
contained within the chip. A VCO is shown on one block diagram that is
designated EX934. I wonder who manufactures this chip and what frequency
range it covers? Apparently it is not a National number.

        Thanks in advance for any information that sheds light on the
current VCO technology.

---
 * QMPro 1.53 * Very Best Regards, [e-mail]


From Unknown Sat Nov 11 07:04:00 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!blackbush.xlink.net!rz.uni-karlsruhe.de!news.uni-ulm.de!news.belwue.de!news.dfn.de!scsing.switch.ch!swidir.switch.ch!in2p3.fr!univ-lyon1.fr!jussieu.fr!math.ohio-state.edu!usc!chi-news.cic.net!simtel!news.kei.com!newsfeed.internetmci.com!info.ucla.edu!unixg.ubc.ca!rover.ucs.ualberta.ca!news.oanet.com!usenet
From: [e-mail] (Gerald Caouette)
Newsgroups: rec.radio.amateur.homebrew
Subject: Amplifier  data needed
Date: 7 Nov 1995 06:27:50 GMT
Organization: Your Organization
Lines: 32
Message-ID: <47mu97$[e-mail]>
NNTP-Posting-Host: dialin17.oanet.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII

I have obtained several cavity amps
Marked as follows

AMPLIFIER, RF AM-3187/UPX-14
STOCK NO. 5895-864-6711
PART NO. 22-135
CONT NO. AF30(635)-16839

mfg

BUDD ELECTRONICS INC.

Aparently this firm is no longer in business. But there is
an other firm of the same name in the eastern USA which knows
nothing of this equipment.

So HELP

I would like to find out the tuning range of the cavity amp
and other parameters. I am hoping that it would make a good
amp on 440 or 1200 MHZ as the tube is a 7399 capible of 500 W
average power at 1200 MHZ,

thanks in advance
73
de ve6nap
Gerald Caouette
Fax [phone]
[e-mail]





From Unknown Sat Nov 11 07:04:01 1995
Path: news.epix.net!news.sprintlink.net!news.onramp.net!news.mind.net!news.uoregon.edu!gatech2!pirates!cssun.mathcs.emory.edu!swrinde!sdd.hp.com!usc!chi-news.cic.net!newsfeed.internetmci.com!in1.uu.net!news00.sunet.se!sunic!news99.sunet.se!erinews.ericsson.se!cnn.exu.ericsson.se!news
From: [e-mail] (Mike Groves)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ATV Newsgroups
Date: Tue, 07 Nov 1995 18:17:48 GMT
Organization: Ericsson Inc.
Lines: 8
Message-ID: <47o7sq$[e-mail]>
References: <47lauq$[e-mail]>
NNTP-Posting-Host: pc125020.exu.ericsson.se

On 6 Nov 1995 15:51:54 GMT, Roger White <rwhite@mw66> wrote:

>Any newsgroups on ATV Operation (especially UHF/Microwave operation)?

Not that I've been able to find, Roger.  Sure wish there was though.

-Mike KD6PKJ



From Unknown Sat Nov 11 07:04:02 1995
Path: news.epix.net!news.sprintlink.net!psgrain!charnel.ecst.csuchico.edu!IntGame!news-out.internetmci.com!newsfeed.internetmci.com!news.kei.com!eff!news.duke.edu!news-server.ncren.net!concert!ashe.cs.unc.edu!not-for-mail
From: [e-mail] (Nick England)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ATV Newsgroups
Date: 8 Nov 1995 15:32:45 -0500
Organization: The University of North Carolina at Chapel Hill
Lines: 47
Distribution: usa
Message-ID: <47r45d$[e-mail]>
References: <47lauq$[e-mail]> <47o7sq$[e-mail]>
NNTP-Posting-Host: altair.cs.unc.edu

              ATV Information Server


     The  ATV ListServe run by Doug Ferrell, KD4MOJ, is  open  to
 any  and  everyone  who has an interest  in  Amateur  Television
 (ATV).

     The ATV ListServe is like a mailing list for E-Mail in  that
 all messages addressed to "[e-mail]" are reflected
 to  all users who are participants of this list. In this way,  a
 discussion  on  ATV  equipment,  information  or  products   are
 redirected  to  each  participants personal  E-mail  account  no
 matter  where you receive your mail (AOL, CompuServe,  Freenets,
 Internet providers etc).

     The ATV ListServe was created by me because I am  interested
 in ATV and there is little on-line information out there. I have
 had  to  savor every bit of information that I run  across  from
 magazines  (ATVQ is excellent! - alittle plug) so maybe  on-line
 input  will help those that are new to this exciting hobby  such
 as myself!


     Now for the particulars of this list.


     To  add  yourself  to  the list,  send  a  message  to
 [e-mail] with the following words in the
 body of the message:

                       SUBSCRIBE ATV

     You  can also delete yourself from the list by  a  including
 any of the following commands in the body of your message:

                      UNSUBSCRIBE ATV

     Address  a  message to [e-mail] to  have  your
 message  redirected to the ATV ListServe for others to read  and
 enjoy!

     Address  a message to Doug, KD4MOJ, at one of the  following
 addresses if you have any questions or comments:

 [e-mail]
 [e-mail]



From Unknown Sat Nov 11 07:04:03 1995
From: [e-mail] (Bob Tournoux)
Subject: RE: ATV Newsgroups
Date: 9 Nov 95 04:43:54 -0800
References: <47lauq$[e-mail]>
Message-ID: <[e-mail]>
Path: news.epix.net!news.sprintlink.net!news.msn.com!msn.com
Newsgroups: rec.radio.amateur.homebrew
Organization: The Microsoft Network (msn.com)
Lines: 6

Roger,

I've been looking for the same thing. If you find one let me know!

Bob
[e-mail]


From Unknown Sat Nov 11 07:04:05 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!peach!atl1!w4qo
From: Jim Stafford-W4QO <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ATV Newsgroups
Date: Thu, 9 Nov 1995 13:53:11 -0500
Organization: Access America, P.O. Box 1222, Alpharetta, GA 30239-1222
Lines: 27
Message-ID: <Pine.SV4.3.91.951109135056.24794A-100000@atl1>
References: <47lauq$[e-mail]> <47o7sq$[e-mail]>
NNTP-Posting-Host: atl1.america.net
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Sender: w4qo@atl1
In-Reply-To: <47o7sq$[e-mail]>

There is lots of stuff on ATV on internet.  Not in newsgroup form, but on
web pages.  Here are a couple.

In Atlanta, ATV is active and on

http://www.mindsrping.com/~rwf.aatn1.html

and the California ATV gang has lots of connections to other ATV sites at

http://www.ladas.com/ATN

This should lead to lots of microwave stuff as well.

73/72/jim/w4qo

On Tue, 7 Nov 1995, Mike Groves wrote:

> On 6 Nov 1995 15:51:54 GMT, Roger White <rwhite@mw66> wrote:
>
> >Any newsgroups on ATV Operation (especially UHF/Microwave operation)?
>
> Not that I've been able to find, Roger.  Sure wish there was though.
>
> -Mike KD6PKJ
>
>
>


From Unknown Sat Nov 11 07:04:05 1995
From: [e-mail] (Mark Wyman)
Subject: RE: basic pirate radio help
Date: 9 Nov 95 15:48:29 -0800
References: <[e-mail]> <46rfqg$[e-mail]> <471mk2$[e-mail]> <47gju1$[e-mail]>
Message-ID: <[e-mail]>
Path: news.epix.net!news.sprintlink.net!news.msn.com!msn.com
Newsgroups: rec.radio.amateur.homebrew
Organization: The Microsoft Network (msn.com)
Lines: 8

        Give the newsgroup ALT.RADIO.PIRATE or ALT.RADIO.MCC a try (I'm not
sure which is what) but there is lots of good info on low power FM
trasmitters there. Also Ramsey Electronics carries two FM Stereo
kits, one synthesized, and one is not. Give them a buzz at
1-800-HOBBY KI(TS).

                        Mark Wyman
                        [e-mail]


From Unknown Sat Nov 11 07:04:06 1995
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.msfc.nasa.gov!bcm.tmc.edu!cs.utexas.edu!swrinde!gatech!news.eas.asu.edu!news.asu.edu!aztec.asu.edu!ajsklar
From: [e-mail] (ALLEN SKLAR)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: basic pirate radio help
Date: 10 Nov 1995 09:02:24 GMT
Organization: Arizona State University
Lines: 6
Message-ID: <47v4f0$[e-mail]>
NNTP-Posting-Host: aztec.asu.edu


Hi ...
The infomation your looking for is at
[e-mail]
I 'am sure they will be very happy to help you..
--


From Unknown Sat Nov 11 07:04:07 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!chi-news.cic.net!usc!nic-nac.CSU.net!cello.gina.calstate.edu!cello.gina.calstate.edu!not-for-mail
From: [e-mail] (William A Moyes)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Coherent CW, what is it?
Date: 6 Nov 1995 20:29:01 -0800
Organization: GINA and CORE+ Services of The California State University
Lines: 7
Message-ID: <47mnad$[e-mail]>
References: <4749kg$[e-mail]>
NNTP-Posting-Host: cello.gina.calstate.edu

        One question about CCW.  Can the demodulation be performed on
audio signal, or must it be performed useing special hardware on the RF
signal (I think I know the answer, but better to ask than not).

                        -William Moyes
                        [e-mail]



From Unknown Sat Nov 11 07:04:08 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!ncrgw2.ncr.com!ncrhub6!daynews!ranger!cn2935.DaytonOH.attgis.COM!john.ackermann
From: [e-mail] (John Ackermann)
Subject: Converting pass cavity to notch
X-Nntp-Posting-Host: cn2935.daytonoh.attgis.com
Message-ID: <[e-mail]>
Lines: 11
Sender: [e-mail] (News Administrative Login)
Organization: AT&T Global Information Solutions
X-Newsreader: Trumpet for Windows [Version 1.0 Rev Final Beta #7]
Date: Tue, 7 Nov 1995 11:39:22 GMT

Does anything need to be done to an ordinary pass-band cavity to use it as a
notch cavity?  It seems "obvious" that a tee connector on one of the
connectors would do it, but is it that simple?  Does the other coupling loop
need to be terminated -- if so, into 50 ohms, or a short?   Any magic length
for the cable between the signal source/sink and the tee connector?

Thanks and 73,

John   AG9V
[e-mail]



From Unknown Sat Nov 11 07:04:09 1995
Path: news.epix.net!news.sprintlink.net!castle.nando.net!news
From: Dave Hockaday <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Converting pass cavity to notch
Date: 7 Nov 1995 20:30:22 GMT
Organization: News & Observer Public Access
Lines: 18
Message-ID: <47ofku$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: grail1501.nando.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)
To: [e-mail]

[e-mail] (John Ackermann) wrote:
>Does anything need to be done to an ordinary pass-band cavity to use it as a
>notch cavity?  It seems "obvious" that a tee connector on one of the
>connectors would do it, but is it that simple?  Does the other coupling loop
>need to be terminated -- if so, into 50 ohms, or a short?   Any magic length
>for the cable between the signal source/sink and the tee connector?
>Thanks and 73,
>John   AG9V
>[e-mail]

Hi John! I've had very good luck by removing one coupling loop and plugging the hole
with a metal disk. Change the remaining loop to approx. 1/10th wavelength, and tune
for notch. Position the loop so that the "cold" end is towards the 1/4 wavelength
center stub.

Hopw that helps.
73 de Dave WB4IUY



From Unknown Sat Nov 11 07:04:10 1995
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.uoregon.edu!psgrain!newsfeed.internetmci.com!chi-news.cic.net!uwm.edu!lll-winken.llnl.gov!enews.sgi.com!decwrl!amd!netcomsv!uu4news.netcom.com!netcomsv!uu3news.netcom.com!ix.netcom.com!netnews
From: [e-mail] (Glenn Sparks)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: Crystal CW Rig - Help!
Date: 6 Nov 1995 15:23:35 GMT
Organization: Netcom
Lines: 26
Message-ID: <47l99n$[e-mail]>
References: <47d81r$[e-mail]>
NNTP-Posting-Host: ix-hou10-20.ix.netcom.com
X-NETCOM-Date: Mon Nov 06  7:23:35 AM PST 1995
Xref: news.epix.net rec.radio.amateur.homebrew:11432 rec.radio.amateur.misc:93977

In <47d81r$[e-mail]> [e-mail] (Eric Jacksch) writes:
>
>Hello all!
>
>I'm still looking for schematics for a very simple, single freqency
>crystal controlled 8m cw transmitter and/or receiver.  I have found
>lots of fancy, tunable units, etc...what I need is a very stable,
>one frequency unit.  It's for telemetry - low power is fine!
>
>Email to [e-mail] would be greatly appreciated.
>
>Thanks,
>Eric.
I don't remember the years, but the ARRL handbook published a
transmitter they called the Cubic Incher, I would guess about the 1985
timeframe.  It was a cubic inch in size, and I beleive 1 watt output.

Also a very simple single conversion receiver can also be constructed
using a crystal for the LO, greatly simplifying the circuit.  I beleive
a Popular electronics about 5 years ago had the schematics for this.

Sorry I can't be more specific, I made a great sacrifice, We have a
foreign exchange student from Paraguay and ALL of my reference material
is stored for the year along with most of my test gear.

KI5GY  Sparky


From Unknown Sat Nov 11 07:04:11 1995
Path: news.epix.net!news.sprintlink.net!gatech2!usenet.eel.ufl.edu!tank.news.pipex.net!pipex!newsfeed.internetmci.com!news2.realtime.net!bga.com!ftp.unisql.com!unisql.unisql.com!news
From: Jim Strohm <jstrohm@blazer>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DeOxit or ProGold?
Date: 9 Nov 1995 16:10:51 GMT
Organization: UniSQL, Inc.
Lines: 18
Message-ID: <47t96b$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: blazer.unisql.com
X-Newsreader: NCSA Mosaic

If you believe CAIG's claims, I can find a distributor for "Co-ax Grease,"
that miracle substance of the 1970s that kept SWRs from clinging
to your feedline.

I'm no longer a QST subscriber (not because of the quality of the mag
or the ARRL, I should mention) so I haven't seen the ads -- QST does
have a policy of not accepting misleading or deceptive ads and I'm really
surprised they took this ad.

I know it's hard to check out every product and every ad in a magazine.
How about one of the ARRL people who's a frequenter of this newsgroup
following up on CAIG's claims of "quantum tunneling" and preventing
"corrosive currents"?

Since it's not April, I know you're looking at a paid ad.

Jim N6OTQ



From Unknown Sat Nov 11 07:04:12 1995
Path: news.epix.net!news.sprintlink.net!news.cirrus.com!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!cs.utexas.edu!math.ohio-state.edu!pacific.mps.ohio-state.edu!usenet
From: James Garland <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DeOxit or ProGold?
Date: 9 Nov 1995 14:04:46 GMT
Organization: The Ohio State University
Lines: 17
Message-ID: <47t1pu$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: maps1.mps.ohio-state.edu
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2N (Windows; I; 16bit)

I'm very dubious about ProGold's claim about bonding plated metals to
the substrate metal. How, for instance, does the product work its way
under the plating?  Also, the "quantum tunneling" description sounds like
advertising malarky (Could this product be intended for 'high-end' audio
enthusiasts, a group whose susceptibilty to high-tech but
meaningless jargon knows no bounds?) Technically, quantum tunneling is
the conduction mechanism between any non-metal and a metal, since current
across the interface involves conduction through a slight potential
barrier. There is nothing mysterious or innovative about the process,
however. The purported ability of the product to distinguish between
desirable and undesirable currents is preposterous. Do some electrons
have little signs on their chests? ("I am a bad electron. Please stop
me.") My impression that this type of product typically involves a thin
conducting polymer which coats the contacts, thereby reducing noise and
scratchiness. It won't work wonders, but it might help a bit on badly
oxidized contacts. Jim W8ZR



From Unknown Sat Nov 11 07:04:13 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!gatech2!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: DeOxit or ProGold?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]> <47t1pu$[e-mail]>
Date: Fri, 10 Nov 1995 22:22:00 GMT
Lines: 17

In article <47t1pu$[e-mail]> James Garland <[e-mail]> writes:
>I'm very dubious about ProGold's claim about bonding plated metals to
>the substrate metal. How, for instance, does the product work its way
>under the plating?  Also, the "quantum tunneling" description sounds like
>advertising malarky (Could this product be intended for 'high-end' audio
>enthusiasts, a group whose susceptibilty to high-tech but
>meaningless jargon knows no bounds?)

Bingo!!!!

Gary

--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |


From Unknown Sat Nov 11 07:04:14 1995
Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!usenet.eel.ufl.edu!gatech!newsfeed.internetmci.com!news.kei.com!simtel!harbinger.cc.monash.edu.au!news.cs.su.oz.au!metro!OzEmail!shell02.ozemail.com.au!nrodger
From: [e-mail] (Nathan Rodger)
Newsgroups: rec.radio.amateur.homebrew
Subject: DTMF Decoder
Date: 10 Nov 1995 06:41:24 GMT
Organization: OzEmail Pty Ltd - Australia
Lines: 5
Message-ID: <47us6k$[e-mail]>
NNTP-Posting-Host: shell02.ozemail.com.au
X-Newsreader: TIN [version 1.2 PL2]

If anybody knows anything at all about making a DTMF decoder, with LCD
display showing decoded tone on it please mail me, [e-mail]
Or alternatly leave the message here, I don't mind.
                Thanks.
                        Cybferet.


From Unknown Sat Nov 11 07:04:15 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!usenet.eel.ufl.edu!news.interlog.com!winternet.com!uunet!in2.uu.net!psinntp!psinntp!psinntp!psinntp!voder!nsc!davef
From: [e-mail] (David Fifield)
Subject: Re: European Transistor Cross-Reference?
Content-Type: text/plain; charset=ISO-8859-1
Message-ID: <9511061523.AA40237@davef>
Sender: [e-mail] (netnews maintenance)
Nntp-Posting-Host: davef.nsc.com
Reply-To: [e-mail] (David Fifield)
Content-Transfer-Encoding: 8BIT
Organization: National Semiconductor, Santa Clara
X-Newsreader: InterCon TCP/Connect II 2.0.1
References: <[e-mail]>
Mime-Version: 1.0
Date: Mon, 6 Nov 1995 23:23:40 GMT
Lines: 33

In article <[e-mail]>, [e-mail]
(George De Grazio) writes:

> Can anyone point me in the direction of a cross-reference for
> European Transistor replacements (i.e., European designators to
> US designators)?
> I understand SPRAT had such a list published in the past, but as yet
> I have not been able to locate the issue.
> Any help will be appreciated.
> 73,
> George De Grazio, WF╪K
>

There is an excellent publication called "Towers International Transistor
Selector", which I believe has just been updated. It is published in the UK
and is available from Maplin Electronic Supplies in Essex, England, phone
011-44-1702-554161.

I have an older version of the book and I'd be more than happy to look to look
up some specific numbers for you, let me know.


73 de KE6ZBZ

Dave Fifield (ex G8INR)

Phone [phone], Fax [phone], email [e-mail]

This email/posting represents my own personal views and not those
of my employer, National Semiconductor Corp., who kindly tolerate
my extra curricular use of this medium.




From Unknown Sat Nov 11 07:04:16 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!soap.news.pipex.net!pipex!dish.news.pipex.net!pipex!europa.chnt.gtegsc.com!news.msfc.nasa.gov!elroy.jpl.nasa.gov!decwrl!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news
From: Ed Hare <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: European Transistor Cross-Reference?
Date: 10 Nov 1995 17:44:11 GMT
Organization: American Radio Relay League, Inc.
Lines: 38
Message-ID: <48031b$[e-mail]>
References: <[e-mail]> <9511061523.AA40237@davef>
NNTP-Posting-Host: efh.arrl.org
Mime-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Transfer-Encoding: 8bit
X-Mailer: Mozilla 1.2N (Windows; I; 16bit)
To: [e-mail]

Should we get one for TIS?

[e-mail] (David Fifield) wrote:
>In article <[e-mail]>, [e-mail]
>(George De Grazio) writes:
>
>> Can anyone point me in the direction of a cross-reference for
>> European Transistor replacements (i.e., European designators to
>> US designators)?
>> I understand SPRAT had such a list published in the past, but as yet
>> I have not been able to locate the issue.
>> Any help will be appreciated.
>> 73,
>> George De Grazio, WF╪K
>>
>
>There is an excellent publication called "Towers International Transistor
>Selector", which I believe has just been updated. It is published in the UK
>and is available from Maplin Electronic Supplies in Essex, England, phone
>011-44-1702-554161.
>
>I have an older version of the book and I'd be more than happy to look to look
>up some specific numbers for you, let me know.
>
>
>73 de KE6ZBZ
>
>Dave Fifield (ex G8INR)
>
>Phone [phone], Fax [phone], email [e-mail]
>
>This email/posting represents my own personal views and not those
>of my employer, National Semiconductor Corp., who kindly tolerate
>my extra curricular use of this medium.
>
>




From Unknown Sat Nov 11 07:04:18 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!van-bc!news.rmii.com!net74.qadas.com!user
From: [e-mail] (George De Grazio)
Newsgroups: rec.radio.amateur.homebrew
Subject: Hambrew Magazine Info
Date: Wed, 08 Nov 1995 20:04:39 -0700
Organization: Hambrew Magazine
Lines: 20
Message-ID: <[e-mail]>
NNTP-Posting-Host: net74.qadas.com

Hambrew is a quarterly publication, 48 pgs. with cover, mostly project
(with some theory & construction tips) oriented. In addition to HF,
Hambrew is currently pushing construction for the 6m band. Usually up to
32 photos per issue.

Subscription information:
$10 (US) per year, + $1 to receive the current issue 1st class to start the sub.
$15 (Canada, Mexico)
$21 (International)

Sample issues: $3.50 ea. sent 1st cl. (US)
               $5.50 ea. sent via air (Int'l)

VISA/MC ok to [phone] (recording)

Hambrew
PO Box 260083
Lakewood, CO 80226-0083

Web page at http://www.qadas.com/hambrew


From Unknown Sat Nov 11 07:04:18 1995
Path: news.epix.net!news.sprintlink.net!paperboy.ids.net!pslip249b.egr-ri.ids.net!user
From: [e-mail] (Ryan M Williams)
Newsgroups: rec.radio.amateur.homebrew
Subject: hmmmm
Date: Wed, 08 Nov 1995 19:25:12 -0500
Organization: Home
Lines: 14
Message-ID: <[e-mail]>
NNTP-Posting-Host: pslip249b.egr-ri.ids.net

*NEW* Amateur Radio Link BBS @ 401-885-3074
Includes: FidoNet, Usenet
InterNet EMail, HAM-Net File
Distribution, & 2000 files available Online!

--
-R.M.Williams
[e-mail]
Check out my *NEW* Web Page
http://ids.net/~rmw/news.html
*NEW* Amateur Radio Link BBS @ 401-885-3074
Includes: FidoNet, Usenet
InterNet EMail, HAM-Net File
Distribution, & 2000 files available Online!


From Unknown Sat Nov 11 07:04:19 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.netrail.net!news-out.internetmci.com!newsfeed.internetmci.com!in2.uu.net!wb3ffv!bbs!George.Gingell
From: [e-mail] (George Gingell)
Subject: Re: homebrew six meter transmitter
Sender: [e-mail] (George Gingell)
Message-ID: <[e-mail]>
Date: Thu, 9 Nov 1995 20:25:38 GMT
Reply-To: [e-mail] (George Gingell)
References: <[e-mail]> <46rfqg$[e-mail]> <472s4u$[e-mail]> <4751jp$[e-mail]>
X-Posting-Software: UniBoard 2.00beta3 S/N 329931
Organization: ABSnet Internet Services, Inc. - [e-mail] - (410)-361-8160
Lines: 35

[e-mail] ((Mr) N Brodt-Savage) writes:

> Bill DuBroff ([e-mail]) wrote:
> : In article <46rfqg$[e-mail]>, [e-mail]
> : says...
>
> : Does any one know of any kits to build low power six meter CW
> : transmitters?  I am specifically looking to build a beacon.
>
>
> : Believe Ten-Tec sells this type of kit.
>
> : wd
> : KF4ECX
>
> any european (preferably British) sources for 6 mtr kits ?
>
> Nigel Brodt-Savage

> [e-mail] > GW7USO
YOU MIGHT WANT TO CHECK OUT KANGA KITS
THEY ARE ON INET AT [e-mail]
Bill Kelsey, N8ET in Findlay Ohio [phone] 7-11 pm EST.
In UK it is KANGA Dick Pascoe, G0BPS
seaview house
crete road east
Folkestone, Kent CT18 7EG
ENGLAND
Sorry, I don't have Dicks phone or email info handy.
He is also associated/well known member of G-QRP Club. They
have a QRP-List over there also. Sorry that info not handy now either.
G3RJV at Blacksheep ETC can help.
QRP DX TU (C)1986 Danny Gingell,[e-mail]

>


From Unknown Sat Nov 11 07:04:21 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!news.erinet.com!news
From: [e-mail] (Kenneth Gunton)
Newsgroups: rec.radio.amateur.homebrew,sci.electronics
Subject: Re: How does a "circulator" work?
Date: 7 Nov 1995 07:36:08 -0500
Organization: EriNet Online 513 436-9915
Lines: 24
Message-ID: <47njro$[e-mail]>
References: <47a3ee$[e-mail]> <47bqmj$[e-mail]>
NNTP-Posting-Host: eri.erinet.com
X-Newsreader: TIN [version 1.2 PL2]
Xref: news.epix.net rec.radio.amateur.homebrew:11439 sci.electronics:158701

Art Blair ([e-mail]) wrote:
: Douglas Braun ([e-mail]) wrote:
: : I have seen descriptions of these for microwaves, where they are built from
: : waveguide and ferrite.  But I would like to make one for 28 MHz out of discrete
: : components.  Has anyone ever seen a description of how these really work,
: : or a circuit for one?  Is it even possible to make one from discrete
: : components (coils, transformers, etc.), or does the operation depend on
: : some magical property of ferrite?

A good friend of mine, who owns a company which manufacturers all types
of ferrite and related devices, said he actually made for one customer a
circulator which operated from around 30 MHz. It was 3 X 3 X 1 inches, and
had 20 dB isolation. Insertion loss was 2.5 dB, with a VSWR of 1.48:1 Max.
These tend to be very narrow band, and are expensive - around $2,500.00 each.


: I can only give you the name of the mag. I dont remember the date but it
: was a few years ago. The magazine is called "RF design". You might
: find it in a university Engineering library.
: Art.
--
Ken Gunton  http://www.erinet.com/kenny
TECHLOCK Distributing Microwave & RF Components
CAGE Code 01DH7 and 0EMT6


From Unknown Sat Nov 11 07:04:22 1995
Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!linux0.unsl.edu.ar!newshost.marcam.com!hookup!news.mathworks.com!news.kei.com!simtel!frankensun.altair.com!sdd.hp.com!hplabs!hplntx!hpscit.sc.hp.com!rkarlqu
From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew,sci.electronics
Subject: Re: How does a "circulator" work?
Date: 9 Nov 1995 16:57:46 GMT
Organization: Hewlett-Packard
Lines: 41
Message-ID: <47tbua$[e-mail]>
References: <47a3ee$[e-mail]> <[e-mail]> <47m3u1$[e-mail]> <[e-mail]>
NNTP-Posting-Host: hpscrj.scd.hp.com
Xref: news.epix.net rec.radio.amateur.homebrew:11472 sci.electronics:158931

In article <[e-mail]>,
Gary Coffman <[e-mail]> wrote:
>
>I knew I'd get a response like this just as soon as I posted. What
>I meant is that for the application he has in mind, a lumped ratrace may
>give him the virtual TR switch he's looking for. I understand the ratrace
>isn't one way like a circulator. Sorry if what I wrote above gives that
>impression (and I can see how it might). That's not what I was trying
>to say. A ratrace can offer adjacent port isolation due to the relative
>phasing around the loop. And if I read what he's trying to do correctly,
>that's what he really needs, not the non-reciprocal action of a circulator.
>
>Gary

Sorry about not knowing what you meant, but all I have to go on is what you wrote.
BTW, even though you do not suffer from this misconception, it is
nonetheless common with others.

As far as using a hybrid instead of a circulator for a TR switch, I
would love to learn how to do that.  From what I can tell, if you
tried to do that by connecting the sum port of a power combiner to
the antenna and the isolated ports to the transmitter and receiver
respectively, you would indeed isolate the transmitter from the receiver
(assuming the antenna had a good match).  However, the difference between
this setup and a circulator TR switch is that you are guaranteed 3 dB. loss
in the power combiner, while the circulator (if perfect) would have no loss.
In the real world, the power combiner would probably have only a few
tenths of a dB. excess loss above the theoretical 3 dB. loss, whereas
someone posted here that a real 28 MHz. circulator they knew about had
2.5 dB. insertion loss.  If that's the state of the art, you might as
well save your $2500 and just use a power combiner, assuming you can
tolerate the 3 dB. loss.  If not, you'll have to use a TR *switch* of
some sort.

Perhaps we have discovered a law governing the figure of merit of
circulators:  A 3 port circulator with more than 3 dB. of insertion
loss can be replaced by a power combiner, and hence has a figure
of merit of zero.  Anyone agree or disagree with this conjecture?

Rick Karlquist N6RK
[e-mail]


From Unknown Sat Nov 11 07:04:24 1995
Newsgroups: rec.radio.amateur.homebrew,sci.electronics
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!gatech2!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: How does a "circulator" work?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <47a3ee$[e-mail]> <[e-mail]> <47m3u1$[e-mail]> <[e-mail]> <47tbua$[e-mail]>
Date: Fri, 10 Nov 1995 22:56:54 GMT
Lines: 31
Xref: news.epix.net rec.radio.amateur.homebrew:11502 sci.electronics:159107

In article <47tbua$[e-mail]> [e-mail] (Richard Karlquist) writes:
>
>Perhaps we have discovered a law governing the figure of merit of
>circulators:  A 3 port circulator with more than 3 dB. of insertion
>loss can be replaced by a power combiner, and hence has a figure
>of merit of zero.  Anyone agree or disagree with this conjecture?

Well, yeah, that's a good way to compare a circulator and a hybrid
for TR purposes, but circulators typically don't have enough port
1 to port 3 isolation to serve as a good TR in any case (typically
less than 20 db, hybrids are typically a little better at around
30 db). The primary use for a circulator is to take advantage of
it's unique reverse isolation. The hybrid can't offer that non-reciprocal
behavior. So you can protect a circuit from "pulling" by a following
circuit, including an antenna with high VSWR. And you can sharply
reduce intermod caused by signals entering the PA and mixing there
before being reradiated. Or you can reduce intermod generated in
a receiver using a mixer as the front end and reradiated back out
the antenna, and reduce LO leakage to the antenna from such receivers
too.

Circulators are usually mandated at multiple repeater sites to
prevent intermod from multiple signals mixing in PAs, or receiver
first mixer IM product reradiation.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |


From Unknown Sat Nov 11 07:04:24 1995
Path: news.epix.net!news.sprintlink.net!news.bluesky.net!solaris.cc.vt.edu!newsfeed.internetmci.com!news.mid.net!news.dra.com!news.interlog.com!io.org!van-bc!unixg.ubc.ca!rover.ucs.ualberta.ca!news.sas.ab.ca!freenet.edmonton.ab.ca!morganp
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: I need some info
Date: 11 Nov 1995 03:32:23 GMT
Organization: Edmonton Freenet, Edmonton, Alberta, Canada
Lines: 12
Message-ID: <4815g7$[e-mail]>
NNTP-Posting-Host: freenet.edmonton.ab.ca
X-Newsreader: TIN [version 1.2 PL2.3]

I would like to build a HF receiver like the one in November 1990 73 mag
(pg 35) and I was wondering if anyone had any tips on making it? This
will be my first receiver so ANY help would be greatly appreachiated (so
I can't spell it right, big deal). Thanx


--
73 & ttyl     Morgan Patterson
       \\///  Internet: [e-mail]
       (o o)  Ham Radio: VE6MRP
        (_)   "Your Computer will self destruct in..5..4..3..2..1..KABOOM!!!"
----oOO-----OOo---------------------------------------------------------------


From Unknown Sat Nov 11 07:04:25 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!wave.news.pipex.net!pipex!dish.news.pipex.net!pipex!iol!news-out.internetmci.com!newsfeed.internetmci.com!chi-news.cic.net!news.compuserve.com!newsmaster
From: [e-mail] (Brian Drummond)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: LO Drive to SL6440: Was (Re: diode mixer drive level)
Date: Fri, 10 Nov 1995 01:00:42 GMT
Organization: CompuServe Incorporated
Lines: 25
Message-ID: <47u8am$[e-mail]>
References: <472iah$[e-mail]> <[e-mail]> <47e939$[e-mail]> <47g0sp$[e-mail]>
NNTP-Posting-Host: dd24-032.compuserve.com
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Jeff Anderson) wrote:


>    Someone on the list may have a data sheet for the SL6440 -- what
>levels do they recommend for the inputs?  And do they discuss the
>multiplier's operation (is the LO signal "squared up"?).

>    - Jeff, WA6AHL

Like most Gilbert cells, it's noisy as hell (compared to a diode
mixer) so you'll need a little RF gain ahead of it.

Unlike most it is rated to 150 MHz, and I've used it in a high quality
AM/FM tuner ( for both bands!)

LO drive - 250mV rms (and give or take 6 dB, seems to make very little
difference, to linearity or conversion gain, so I think it's switching
at that level).

Input intercept point is said to be +30 dBm, and I can believe it.
To get this, though, takes a lot of power!

Hope thisa helps - Brian.




From Unknown Sat Nov 11 07:04:26 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!dish.news.pipex.net!pipex!europa.chnt.gtegsc.com!news.uoregon.edu!stallion.jsums.edu!gatech2!pirates!cssun.mathcs.emory.edu!swrinde!sdd.hp.com!vixen.cso.uiuc.edu!uwm.edu!chi-news.cic.net!io.org!winternet.com!uunet!in2.uu.net!emi.com!crier.knighted.com!knighted.com!yingst
From: [e-mail] (Harry Yingst)
Newsgroups: rec.radio.amateur.homebrew
Subject: Mods for Icom IC-736
Date: 9 Nov 1995 23:41:37 GMT
Organization: Knighted Computers
Lines: 56
Message-ID: <47u3jh$[e-mail]>
NNTP-Posting-Host: knighted.com
X-Newsreader: TIN [version 1.2 PL2]

Does anyone have any mods for the ICOM IC-736?  I'm looking for a way to
turn the pre-amp back on below 1.6 Mhz.
 Icom turns it off even though it the light says it's on.
 I would like to listen for some lowfer stations 1750 meter band
 (160-190 kc. 1 watt into a 50 ft antenna).  I'm also looking for a way to
improve the recieve audio.
 The recieve audio sounds flat and distant, lacking highs & lows.
 With the notch filter ON the audio sounds a little better,
 but it still could use some improvement.
 They re-shape the audio through the notch filter,
 and it actually has a nicer sound with the notch filter on
 (Has more highs & lows).
 I had a IC-737 that had the same problem with the audio,
 just not sounding quite right.  I am also interested in any other mods
for the Icom IC-736.  Please send any replies to [e-mail] Note:
If you post a reply into this newsgroup I proably wont get it,
      my internet provider only holds news for 1 day.  Thank You.  Harry
N6VUJ








































From Unknown Sat Nov 11 07:04:27 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!gatech2!usenet.eel.ufl.edu!newsfeed.internetmci.com!in2.uu.net!news.interlog.com!io.org!torfree!ao779
From: [e-mail] (CB Smith)
Subject: NE602 sources ?
Message-ID: <[e-mail]>
Organization: Toronto Free-Net
X-Newsreader: TIN [version 1.2 PL2]
Date: Thu, 9 Nov 1995 14:28:37 GMT
Lines: 11

Where have all the NE602's gone. I have checked stock with most of the
major NA suppliers and all of them have had this device on back order for
many months.

Does anyone have a Philips source to find out the reason for the delays?

Or is the NE602 going the way of the 40673 ?

73 de Brian VE3EX
[e-mail]



From Unknown Sat Nov 11 07:04:29 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.zynet.com!tesuque.cs.sandia.gov!ferrari.mst6.lanl.gov!newshost.lanl.gov!usenet
From: Jim Devenport <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NE602 sources ?
Date: 9 Nov 1995 22:56:40 GMT
Organization: Los Alamos National Laboratory
Lines: 18
Message-ID: <47u0v8$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: jdport.lanl.gov
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 32bit)
To: [e-mail]

I just wasted an hour calling my usual sources (Jameco,
Digi-Key, etc) as well as multiple searches through the
National Semiconductor web site and could find no evidence they
ever knew it existed.  I have several that I stocked up with
several years ago for "future receiver projects"... if they
truly have been orphaned I guess I'd just as well sell them to
you cheep.  Let me look thru the parts stock to see how many I
have (trouble is I have several receivers that use this IC,
such as several Ramsey aircraft band receivers and a 220 MHZ
Ramsey receiver).

--
*********** Jim Devenport WB5AOX **************
*      PO Box 445, McIntosh NM 87032          *
*        http://nis-www.lanl.gov/~jdport/     *
***********************************************




From Unknown Sat Nov 11 07:04:29 1995
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.umbc.edu!eff!usenet.ins.cwru.edu!b64198.student.cwru.edu!wong
From: wong@PROBLEM_WITH_INEWS_DOMAIN_FILE (Alan Wong)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NE602 sources ?
Date: 11 Nov 1995 09:02:57 GMT
Organization: String to put in the Organization Header
Lines: 12
Message-ID: <481os1$[e-mail]>
References: <[e-mail]> <47u0v8$[e-mail]>
NNTP-Posting-Host: b64198.student.cwru.edu
X-Newsreader: TIN [version 1.2 PL2]

Jim Devenport ([e-mail]) wrote:
: I just wasted an hour calling my usual sources (Jameco,
 Digi-Key, etc) as well as multiple searches through the

I did the same yesterday, but sad to say, it was a bit more then an hour.
The closest answer I got all day was not until early '96.  My question
is, can any other part by sub'ed for the NE602?  I've looked through
the cross ref guides with no luck, but I'm hoping that by some chance
I'll find one here.

jh. - n9rbi



From Unknown Sat Nov 11 07:04:30 1995
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!geraldo.cc.utexas.edu!usenet
From: [e-mail] (Richard Friedrich)
Newsgroups: rec.radio.amateur.homebrew
Subject: need 2N-3641
Date: 6 Nov 1995 21:11:40 GMT
Organization: The University of Texas at Austin
Lines: 14
Message-ID: <47ltmc$[e-mail]>
NNTP-Posting-Host: slip-11-12.ots.utexas.edu
X-Newsreader: WinVN 0.90.4

need 2N3641 for a heathkit 27 mhz xmitter

ecg book says that 123A crosses over - thought it does work
it geets too hot and burns out in 5 minutes

any one have an OEM


thanks


richard




From Unknown Sat Nov 11 07:04:31 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!usenet.eel.ufl.edu!brutus.bright.net!chi-news.cic.net!newsfeed.internetmci.com!news.sisna.com!jmo-amct.atc.alcoa.com!user
From: [e-mail] (John Orange)
Subject: Need Modulatiopn Transformer
Message-ID: <[e-mail]>
Date: Tue, 07 Nov 1995 12:03:02 GMT
Organization: Alcoa Technical Center
X-Newsreader: Value-Added NewsWatcher 2.0b14.2+
Lines: 6

I need a 500 watt multi-tap modulation transformer, a UTC CVM-5 preferably.
I will swap a fine Drake C-Line for this iron.

de w3ZDF

tnx



From Unknown Sat Nov 11 07:04:32 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!EU.net!dkuug!cph-1.news.DK.net!dknet!Norway.EU.net!telepost.no!nntp-oslo.UNINETT.no!nntp-trd.UNINETT.no!stud.hials.no!iaa
From: [e-mail] (Ivar Aarsnes)
Newsgroups: rec.radio.amateur.homebrew
Subject: New ham-radio Homepage!
Date: 8 Nov 1995 10:03:41 GMT
Organization: H|gskolen i ]lesund
Lines: 7
Message-ID: <47pv9t$[e-mail]>
NNTP-Posting-Host: postkontor.stud.hials.no
X-Newsreader: TIN [version 1.2 PL2]

I have a new homepage dedicated to ham radio on the Internet.
feel free to check it out, and maybe mail me suggestion/new links.

The address is : http://stud.hials.no:24892/~iaa/ham.html


73 de Ivar


From Unknown Sat Nov 11 07:04:33 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: OSCILLATORS USING MMIC?
Date: 10 Nov 1995 07:13:25 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 37
Sender: [e-mail]
Message-ID: <47vfl5$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <[e-mail]>,
[e-mail] (Larry Braden) writes:

>
>I have about four MAR-1 MMIC devices that I want to use in a few
>projects.  I was thinking of using a couple of them to build an RF
pre-amp
>for a receiver or my frequency counter.  But it occured to me that they
>might also be quite useful in an oscillator application.  Though the
MAR-1
>MMIC's are "unconditionally stable" - which I take to mean it may not
>oscillate very easily, I was wondering if anyone might be using these or
>other MMIC devices as oscillators?  If so, I would appreciate hearing
>about your basic approach to this.
>
>Thanks & 73 - Larry KC5CWG  [e-mail]
>
>
>
Hi Larry,

I was assigned the project of reviewing a MMIC oscillator using the device
you mention. They do oscillate if you use a 180 dgree phase shift network
between the input and output, but present some problems.

It is necessary to maintain selectivity in the feedback circuit, so a
simple T or Pi type phase shift network isn't very good. The MMIC also
requires external AGC or signal level limiting circuitry for good
performance.

I can go into the details of why if you like, but the short of it is they
are not very good in oscillator applications. They are generally prone to
be unstable and have phase and AM noise. There are lots of devices that
work better in oscillators and most of them have a lower supporting
component requirement.

73 Tom


From Unknown Sat Nov 11 07:04:34 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!gatech2!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: OSCILLATORS USING MMIC?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]>
Date: Fri, 10 Nov 1995 23:16:17 GMT
Lines: 37

In article <[e-mail]> [e-mail] (Larry Braden) writes:
>I have about four MAR-1 MMIC devices that I want to use in a few
>projects.  I was thinking of using a couple of them to build an RF pre-amp
>for a receiver or my frequency counter.  But it occured to me that they
>might also be quite useful in an oscillator application.  Though the MAR-1
>MMIC's are "unconditionally stable" - which I take to mean it may not
>oscillate very easily, I was wondering if anyone might be using these or
>other MMIC devices as oscillators?  If so, I would appreciate hearing
>about your basic approach to this.

What "unconditionally stable" means in this context is that no value
of mismatch at an input or output port of the amplifier will cause
it to break into self-oscillation. That's an entirely separate issue
from a deliberate oscillator. Any amplifier with a gain of 1 or more
can be made into an oscillator by feeding back the output to the
input (through a suitable external frequency/phase selective network).

A big problem with MMICs as oscillators is their wide bandwidth. They
tend to motorboat if you aren't careful, and have higher phase noise than
is desirable too.  MMICs are deliberately designed to be broad band,
and that's an undesirable trait in an oscillator, or in a preamp where
best noise figure is desired. You'd prefer the device to have less
than unity gain at all frequencies other than the desired one.

MMICs are great as *buffer* amps following an oscillator, or as
buffers following a good FET preamp where insensitivity to the
following load impedance is an asset, or as post-mixer or post-filter
amps where a broad band termination is desired, but they aren't so
good as the first element of a preamp or as the active device in an
oscillator.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |


From Unknown Sat Nov 11 07:04:35 1995
Path: news.epix.net!news.sprintlink.net!news.dgsys.com!sloth.swcp.com!tesuque.cs.sandia.gov!ferrari.mst6.lanl.gov!newshost.lanl.gov!ncar!noao!news.eas.asu.edu!cs.utexas.edu!news.ti.com!news.dseg.ti.com!mksim8!blair
From: [e-mail] (Art Blair)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Passive Mixer IP3 Question
Date: 1 Nov 1995 00:44:23 GMT
Lines: 23
Message-ID: <476ft7$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: mksim8.dseg.ti.com
X-Newsreader: TIN [version 1.2 PL2]

Alan F. Jovanovich ([e-mail]) wrote:
: The manufacturer (RF Prime) gives me an Input Intercept Point of
: +8dBm.

: Since the Input IP3 and Output IP3 differ by the gain, do I use a
: negative gain here?

Yes.

: In other words, is the Output Intercept  -1.3dBm or +17.3dBm?

-1.3

: I realize that the manufacturers figure is only good for a
: non-reactive 50ohm load, and I will have to measure its performance
: into my IF filter, but any light that could be shed on the subject
: would be most appreciated.  Thanks.

Consider using a diplexer instead of just a filter to match the out
of band stuff and retain your dynamic range. Or, if you can afford
the loss, just a pad can do alot.
Art.



From Unknown Sat Nov 11 07:04:36 1995
Path: news.epix.net!news.sprintlink.net!malgudi.oar.net!news.erinet.com!netcom.com!ix.netcom.com!netnews
From: [e-mail] (Wanda M Desmond )
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: PRC-47 LSB Mod????
Date: 9 Nov 1995 16:50:57 GMT
Organization: Netcom
Lines: 10
Message-ID: <47tbhh$[e-mail]>
References: <47se19$f7k$[e-mail]> <47t6hh$[e-mail]>
NNTP-Posting-Host: bak-ca1-07.ix.netcom.com
X-NETCOM-Date: Thu Nov 09  8:50:57 AM PST 1995
Xref: news.epix.net rec.radio.amateur.equipment:21288 rec.radio.amateur.homebrew:11489

I read somewhere that a mod for adding LSB to the PRC-47's USB
transmit/receive exists. Anyone know anything about this? The name of
the company that supplies the kit, parts, schematic, whatever?

Thanks!!

John
KE6TGN

Only a Tech, but working on the General . . .


From Unknown Sat Nov 11 07:04:37 1995
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!news.kreonet.re.kr!news.dacom.co.kr!news.uoregon.edu!chi-news.cic.net!uwm.edu!msunews!harbinger.cc.monash.edu.au!newsserver.trl.OZ.AU!pcies4.trl.OZ.AU!ddiamond
From: [e-mail] (Drew Diamond)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Q: Matching caps and inductors
Date: Wed, 8 Nov 1995 13:20:10
Organization: TRL
Lines: 20
Message-ID: <[e-mail]>
References: <47ci8d$[e-mail]>
NNTP-Posting-Host: pc0126.trl.oz.au
Keywords: Matching L and C
X-Newsreader: Trumpet for Windows [Version 1.0 Rev Final Beta #7]


>I am building R2 receiver, and some of the inductors and capacitors
>need to be matched within 1%. >I don'Æt have an lc-bridge (all I have is a
digital multimeter!).>Are there any other ways of matching these components,
>or do I have to build an lc-bride as well?>If so, how can I make sure that
the bridge itself  >is accurate enough? >Any suggestions are most welcome.
>72,999 de Kari OH6BZ

Kari, see if you can get a copy of; "Build this L-C Checker" by Jack Najork,
W5FG in Ham Radio (USA) Dec. '88. Jack uses a Colpitts oscillator, to which
are applied your unknown coils and capacitors. If you have access to a
frequency counter (or another calibrated receiver), you should be able to
match components to well within 1%. Use this simple formula;

CpF = 25330 divided by (frequency MHz squared X LuH), and

LuH = 25330 divided by (frequency MHz squared X CpF).

73, Drew, VK3XU.



From Unknown Sat Nov 11 07:04:38 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!lori.albany.net!news.sover.net!news-out.internetmci.com!newsfeed.internetmci.com!chi-news.cic.net!simtel!news00.sunet.se!sunic!psinntp!psinntp!psinntp!psinntp!voder!nsc!davef
From: [e-mail] (David Fifield)
Subject: QST Nov '95: A Small High-Performance CW Transceiver
Content-Type: text/plain; charset=US-ASCII
Message-ID: <9511061822.AA53003@davef>
Sender: [e-mail] (netnews maintenance)
Nntp-Posting-Host: davef.nsc.com
Reply-To: [e-mail] (David Fifield)
Organization: National Semiconductor, Santa Clara
X-Newsreader: InterCon TCP/Connect II 2.0.1
Mime-Version: 1.0
Date: Tue, 7 Nov 1995 02:22:53 GMT
Lines: 32

In the November 1995 edition of QST there is a nice design for a 20m QRP rig
using the miniR2.

In the VFO/TX schematic on pages 42/43 I have noticed a few things:

1) I don't see how the CW offset transistor can be an NPN device with its
emitter connected to +12V. I reckon they have transposed the emitter and
collector terminals. Anyone care to comment?

2) The VFO inductor L1 has a tap, but there doesn't appear to be any
information on the number of turns up the tap should be. Anyone know what it
should be?

3) The quadrature generation circuit consisting of L2A/B and associated
components gives us no information as to the phasing of the inductor windings.
I don't have a copy of KK7B's SPRAT article that describes this phase shift
network. Does anyone know where the "dots" should go on the schematic?

Any help would be appreciated. Thanks in advance.


73 de KE6ZBZ

Dave Fifield (ex G8INR)

Phone [phone], Fax [phone], email [e-mail]

This email/posting represents my own personal views and not those
of my employer, National Semiconductor Corp., who kindly tolerate
my extra curricular use of this medium.




From Unknown Sat Nov 11 07:04:39 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!soap.news.pipex.net!pipex!dish.news.pipex.net!pipex!lade.news.pipex.net!pipex!iol!news-out.internetmci.com!newsfeed.internetmci.com!chi-news.cic.net!uwm.edu!lll-winken.llnl.gov!enews.sgi.com!decwrl!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news
From: Zack Lau <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Nov '95: A Small High-Performance CW Transceiver
Date: 8 Nov 1995 23:48:17 GMT
Organization: American Radio Relay League
Lines: 31
Message-ID: <47rfk1$[e-mail]>
References: <9511061822.AA53003@davef>
NNTP-Posting-Host: mgate.arrl.org
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2N (Windows; I; 16bit)
To: [e-mail]

[e-mail] (David Fifield) wrote:
>In the November 1995 edition of QST there is a nice design for a 20m QRP rig
>using the miniR2.
>
>In the VFO/TX schematic on pages 42/43 I have noticed a few things:
>
>1) I don't see how the CW offset transistor can be an NPN device with its
>emitter connected to +12V. I reckon they have transposed the emitter and
>collector terminals. Anyone care to comment?
>

I think it should be a 2N3906 PNP instead of the 2N3904 (how I would
have done it).  You could also use the 2N3904 if you reversed
the emitter and collector.

>2) The VFO inductor L1 has a tap, but there doesn't appear to be any
>information on the number of turns up the tap should be. Anyone know what it
>should be?

Typically, tapping 1/3 the way up usually works. (8 turns)  Tap up
higher if you need more feedback--closer to the ground for less.

>
>3) The quadrature generation circuit consisting of L2A/B and associated
>components gives us no information as to the phasing of the inductor windings.

I'd put the phasing dots next to either of the 100 pF capacitors--but
not both!--Zack KH6CP/1





From Unknown Sat Nov 11 07:04:40 1995
Path: news.epix.net!news.sprintlink.net!newsat!engineer.mrg.uswest.com!news.uoregon.edu!chi-news.cic.net!uwm.edu!lll-winken.llnl.gov!enews.sgi.com!decwrl!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news
From: Zack Lau <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Nov '95: A Small High-Performance CW Transceiver
Date: 8 Nov 1995 23:46:22 GMT
Organization: American Radio Relay League
Lines: 31
Message-ID: <47rfge$[e-mail]>
References: <9511061822.AA53003@davef>
NNTP-Posting-Host: mgate.arrl.org
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2N (Windows; I; 16bit)
To: [e-mail]

[e-mail] (David Fifield) wrote:
>In the November 1995 edition of QST there is a nice design for a 20m QRP rig
>using the miniR2.
>
>In the VFO/TX schematic on pages 42/43 I have noticed a few things:
>
>1) I don't see how the CW offset transistor can be an NPN device with its
>emitter connected to +12V. I reckon they have transposed the emitter and
>collector terminals. Anyone care to comment?
>

I think it should be a 2N3906 PNP instead of the 2N3904 (how I would
have done it).  You could also use the 2N3904 if you reversed
the emitter and collector.

>2) The VFO inductor L1 has a tap, but there doesn't appear to be any
>information on the number of turns up the tap should be. Anyone know what it
>should be?

Typically, tapping 1/3 the way up usually works. (8 turns)  Tap up
higher if you need more feedback--closer to the ground for less.

>
>3) The quadrature generation circuit consisting of L2A/B and associated
>components gives us no information as to the phasing of the inductor windings.

I'd put the phasing dots next to either of the 100 pF capacitors--but
not both!--Zack KH6CP/1





From Unknown Sat Nov 11 07:04:41 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!wave.news.pipex.net!pipex!dish.news.pipex.net!pipex!lade.news.pipex.net!pipex!europa.chnt.gtegsc.com!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!solaris.cc.vt.edu!newsrelay.netins.net!delta.misha.net!usenet
From: [e-mail] (Roger W Sellers)
Newsgroups: rec.radio.amateur.homebrew
Subject: Radio Shack FM antenna mod
Date: 8 Nov 1995 04:15:29 GMT
Organization: Midwest Information Super Highway Access Group, Inc.
Lines: 8
Message-ID: <47pat1$[e-mail]>
NNTP-Posting-Host: dial26.misha.net
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.6

Could someone give me any specs on how to modify a Radio Shack Hi gain FM (yagi
type) antenna to work on 2 meters. I'm looking for info on what lengths to cut
the elements to. I heard this could be done and good for use on fox-hunts.
Please reply he or e-mail me at [e-mail].
Thanks,
Roger
KB9LBU



From Unknown Sat Nov 11 07:04:42 1995
Path: news.epix.net!news.sprintlink.net!netaxis.com!root
From: [e-mail] (Mark LaPolt)
Newsgroups: rec.radio.amateur.homebrew
Subject: Ramsey FX440
Date: 7 Nov 1995 04:34:06 GMT
Organization: Your Organization
Lines: 12
Message-ID: <47mnju$[e-mail]>
NNTP-Posting-Host: du51.netaxis.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.6

Has anyone out there received satisfactory results with the Ramsey
FX440 transceiver kit? I built one, but once completed, I noticed a plethora of
ploblems. For instance, the microphone amp not working, the VCO being VERY
susceptable to 'mechanical' noise (i.e. touching the board with an insulated
tweaker), no power out, and lousy sensitivity. I thought I did a pretty decent
job assembing this thing, but either I'm WAY off in my assembly techniques, or
the kit's not what it's cracked up to be. I'm going to start troubleshooting
the rig this week (I hope), and will keep any interested parties up to date.

[e-mail]
Mark LaPolt N1UNE



From Unknown Sat Nov 11 07:04:43 1995
From: [e-mail] (Mark Wyman)
Subject: RE: Ramsey FX440
Date: 9 Nov 95 15:43:42 -0800
References: <47mnju$[e-mail]>
Message-ID: <[e-mail]>
Path: news.epix.net!news.sprintlink.net!news.msn.com!msn.com
Newsgroups: rec.radio.amateur.homebrew
Organization: The Microsoft Network (msn.com)
Lines: 12

        Try giving Ramsey Tech support a buzz, they will be happy to help
you with your problems. The tech team there is very helpfull. Also I
know of many HAMS who are very happy with the FX series of
transceiver kits. (Some even use them for 9600 baud packet with no
problems!).

        The phone number is 1(716)924-4560 and have a good description of
the problem.


                        Mark Wyman
                        [e-mail]


From Unknown Sat Nov 11 07:04:44 1995
Path: news.epix.net!news.sprintlink.net!netaxis.com!root
From: [e-mail] (Mark LaPolt)
Newsgroups: rec.radio.amateur.homebrew
Subject: RE: Ramsey FX440
Date: 11 Nov 1995 05:00:13 GMT
Organization: Your Organization
Lines: 19
Message-ID: <481akt$[e-mail]>
References: <47mnju$[e-mail]> <[e-mail]>
NNTP-Posting-Host: du73.netaxis.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.6

>
>        The phone number is 1(716)924-4560 and have a good description of
>the problem.
>
>
>                        Mark Wyman
>                        [e-mail]

        I'd be VERY suprised if there were NOT people who got them to work.
Unfortunately, I can't seem to find one. At least not one who did not have a
significant amount of trouble with the radio. I've got the project on the back
burner for now, but hope to get back into it in the coming week. I'll keep the
tech support # on hand for last resort, but I want to try to solve this one
meself.

        Tnx and 73's
        Mark LaPolt N1UNE
        [e-mail]



From Unknown Sat Nov 11 07:04:45 1995
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!usenet.eel.ufl.edu!newsfeed.internetmci.com!in2.uu.net!server.iadfw.net!usenet
From: [e-mail] (Kerry Miller)
Newsgroups: rec.radio.amateur.homebrew
Subject: Req. SWL Freqs
Date: Sat, 11 Nov 1995 03:12:38 GMT
Organization: Internet America
Lines: 8
Message-ID: <4814cp$[e-mail]>
NNTP-Posting-Host: dal01-29.ppp.iadfw.net
X-Newsreader: Forte Free Agent 1.0.82

I have a missionary friend in Ecuador who asked and I didn't know - is
there a shortwave station that broadcasts NFL games?  He is especially
interested in Dallas Cowboy games.
Thanks (and sorry I'm a bit off topic),
Kerry Miller
WD5ABC




From Unknown Sat Nov 11 07:04:46 1995
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!chi-news.cic.net!simtel!swidir.switch.ch!in2p3.fr!univ-lyon1.fr!elendir
From: [e-mail] (Elendir)
Newsgroups: rec.radio.amateur.homebrew
Subject: RF JFET/BJT Spice models
Date: 8 Nov 1995 16:11:08 GMT
Organization: ENST - Telecom Paris
Lines: 13
Message-ID: <47qkqs$[e-mail]>
NNTP-Posting-Host: julia.enst.fr
X-Newsreader: TIN [version 1.2 PL2]

Hello !++After the successful (spelling ?) compilation of Spice 3f4 on my
Atari Falcon (running Linux - just in case), I am obviously looking for
Spice models of RF devices, mostly JFET like 2N4416 or J310 and power BJT
(I have no reference in mind).
Does anybody know where I could find those (precious) documents ?

THX ES 73 DE F5RCS :-)

Vince.

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


From Unknown Sat Nov 11 07:04:47 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!ncrgw2.ncr.com!ncrhub6!daynews!ranger!cn2935.DaytonOH.attgis.COM!john.ackermann
From: [e-mail] (John Ackermann)
Subject: Spec Analyzer + Noise Gen = Tracking Generator?
X-Nntp-Posting-Host: cn2935.daytonoh.attgis.com
Message-ID: <[e-mail]>
Lines: 45
Sender: [e-mail] (News Administrative Login)
Organization: AT&T Global Information Solutions
X-Newsreader: Trumpet for Windows [Version 1.0 Rev Final Beta #7]
Date: Tue, 7 Nov 1995 11:36:09 GMT

Sorry if this is a bit long, but in addition to posing a question this might
be useful info for other folks.

If you can't have a network analyzer for tuning cavities, the next best thing
is a spectrum analyzer with a tracking generator.  Of course, such things
aren't cheap.

I'd always wondered if a noise generator could serve as a signal source for
cavity tuning.  If its output is relatively flat over the narrow range you
typically look at, you should be able to see the bandpass characteristic very
nicely.

Well, at Hamvention last year, I got an answer.  The Advantage Instruments
people were selling their spectrum analyzer with a tracking generator option
for only $100 extra.  I asked them about it and discovered it was, in fact, a
noise generator!  The gen is supposedly flat to 1500 MHz.

They were willing to sell the noise generator module separately, so I ordered
one.  And, I finally got my Tek 491 analyzer back from the shop and was able
to play with the combination a little bit last evening.  With the video
filter in line to smooth out the noise, and with a slow sweep speed, it did
work!!!

Well, pretty much, anyway.  I was able to look at some helical resonators and
see a very nice passband, and do a good job tuning them.  On the other hand,
attempts to look at notch-type devices (a couple of notch only duplexers)
didn't work at all.  I could get all sorts of bumps on the screen, but
couldn't see anything that looked like a notch.

Also, I noticed that the analyzer showed some dips -- including one very large
one near the left edge of the display -- that didn't move with tuning.  I
don't know if these were image responses or some other spurious signal.  I
suppose that the mixing products from a broadband noise source could be
interesting!

Anyway, I wonder if anyone else has experience with this sort of lash up, and
any advice on how to make it work better -- particularly how to look at
notches.  My first guess is that using 50 ohm pads on both the output of the
generator and the input to the analyzer might make a big difference by
ensuring that the cavity is seeing the right impedance.

73,
John   AG9V
[e-mail]



From Unknown Sat Nov 11 07:04:48 1995
Path: news.epix.net!news.sprintlink.net!castle.nando.net!news
From: Dave Hockaday <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Spec Analyzer + Noise Gen = Tracking Generator?
Date: 7 Nov 1995 20:33:49 GMT
Organization: News & Observer Public Access
Lines: 20
Message-ID: <47ofrd$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: grail1501.nando.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)
To: [e-mail]


>Anyway, I wonder if anyone else has experience with this sort of lash up, and
>any advice on how to make it work better -- particularly how to look at
>notches.  My first guess is that using 50 ohm pads on both the output of the
>generator and the input to the analyzer might make a big difference by
>ensuring that the cavity is seeing the right impedance.
>
>73,
>John   AG9V
>[e-mail]
>

that is exactly what I was about to say! I've had similar problems with notch
cavities and found that 50 ohm pads will do the trick.

I build a lot of my own cavities, including bandpass cans. I prefer notch cavities,
hands down, if my stuff is gonna be at a fairly clean site.

73 de Dave WB4IUY



From Unknown Sat Nov 11 07:04:49 1995
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!bcm.tmc.edu!news.msfc.nasa.gov!newsfeed.internetmci.com!chi-news.cic.net!simtel!news00.sunet.se!sunic!news99.sunet.se!news1.transpac.net!news2.transpac.net!news.tripnet.se!news
From: [e-mail] (Ulf Lange)
Newsgroups: rec.radio.amateur.homebrew
Subject: Transverter 28 MHz to 144 MHz
Date: 7 Nov 1995 18:01:11 GMT
Organization: Tripnet AB
Lines: 7
Message-ID: <47o6t7$[e-mail]>
NNTP-Posting-Host: styx5.tripnet.se
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.6

Is there any European or US company, respectively, manufacturing or selling
a reasonably priced 28 MHz to 144 MHz transverter kit?

Please, reply via e-mail to [e-mail]

73's de SM6FYQ Ulf



From Unknown Sat Nov 11 07:04:50 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!news1.digital.com!decwrl!waikato!news.massey.ac.nz!sysadmin
From: [e-mail] (Malcolm Loudon)
Newsgroups: rec.radio.amateur.homebrew
Subject: UHF transistors
Date: 7 Nov 1995 22:46:03 GMT
Organization: Massey University
Lines: 13
Message-ID: <47onjb$[e-mail]>
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X-Newsreader: WinVN 0.92.6+

Hi,

I have been experimenting with low power UHF/microwave oscillators and
amplifiers and now want to increase the power level that I am using.
Most of these experiments were with wideband, low power devices
(BFR96S, BFG34 etc) which are inexpensive and easily obtained. What I
would like are some suggestions for medium power (1-5W) UHF transistors
that are cheap (I will probably blow up several of them!) and readily
available. I was wondering what cell-phones use for the final stage -
presumably cellphone transistors are relativly cheap and common (unless
of course they use a hybrid module for the PA). Any suggestions ?

Malcolm


From Unknown Sat Nov 11 07:04:50 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!news.sisna.com!not-for-mail
From: [e-mail]
Subject: UTC VM5 Mod. Transformer
Message-ID: <b87cb$[e-mail]>
Date: Wed, 08 Nov 1995 15:57:40 GMT
X-Newsreader: Forte Free Agent 1.0.82
Lines: 8

I am looking to buy or trade my Drake C-line T4XC and a R4C for a UTC
model VM5 multitap modulation transformer.

Please Email replys to: [e-mail] or
leave me a message here.

tnx de W3ZDF




From Unknown Sat Nov 11 07:04:51 1995
Path: news.epix.net!news.sprintlink.net!psgrain!fizban.solace.mh.se!demos!news.uni-stuttgart.de!news.belwue.de!news.informatik.uni-stuttgart.de!gelleric
From: [e-mail] (Wolfgang Gellerich)
Newsgroups: rec.radio.amateur.homebrew
Subject: Vacuum capacitors -- Jennings' address ?In article <9511061846.AA18430@adphdw20>, [e-mail] (Dennis Ashworth) writes:
Date: 7 Nov 1995 07:34:51 GMT
Organization: Informatik, Uni Stuttgart, Germany
Lines: 20
Sender: gelleric@kafka (Wolfgang Gellerich)
Distribution: world
Message-ID: <47n26r$[e-mail]>
References: <9511061846.AA18430@adphdw20>
NNTP-Posting-Host: kafka.informatik.uni-stuttgart.de

I am going to build a magnetic loop and made the experience that variable
vacuum capacitors are very difficult to find here in germany. However, a company
calles Jennings, USA, produces them. Does anyone have the address of
Jennings ?

Thanks for your help !

vy 73, Wolfgang DJ3TZ



+----------------------------------------------------------------------------+
|Wolfgang Gellerich                    [e-mail] |
|Universitaet Stuttgart; Institut fuer Informatik                            |
|Breitwiesenstrasse 20-22; D-70565 Stuttgart; Germany                        |
|Tel. [phone]  Fax [phone]                                   |
|(Amateur Radio : DJ3TZ@DB0RBS.#BW.DEU.EU)            ACM Member No. 4436341 |
+----------------------------------------------------------------------------+




From Unknown Sat Nov 11 07:04:52 1995
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!howland.reston.ans.net!spool.mu.edu!usenet.eel.ufl.edu!brutus.bright.net!chi-news.cic.net!newsfeed.internetmci.com!in1.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: VLF Voltage Probe?
Date: 7 Nov 1995 04:58:51 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 25
Sender: [e-mail]
Message-ID: <47nakr$[e-mail]>
References: <47lbe4$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <47lbe4$[e-mail]>, [e-mail] (Jon Jesse)
writes:

>
>Hello,
>I wanted to try some VLF DXing this winter and while thumbing through
>some old mags, I saw an aticle for a "voltage probe".. It concentrated
>on imped. matching rather than high gain.  Trouble is, no diagram or
>parts list.  Does anyone have a diagram for a VLF voltage probe?
>
>

Hi Jon,

I used arrays of voltage probe antennas on 160 meters. It's simple.

You can use a small vertical (I used a ten foot conduit pipe) directly
driving the gate of a J310 FET source follower. When properly biased, the
output Z of the J310 is around 75 ohms, so the source can be connected
directly to the transmission line.

You may have to bypass the gate with a small shunt C to reduce gain at
higher frequencies. If you have a FAX I can send you a drawing.

73 Tom


From Unknown Sat Nov 11 07:04:54 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!wave.news.pipex.net!pipex!dish.news.pipex.net!pipex!lade.news.pipex.net!pipex!iol!news-out.internetmci.com!newsfeed.internetmci.com!chi-news.cic.net!simtel!news3.noc.netcom.net!ix.netcom.com!netcom.com!mzenier
From: [e-mail] (Mark Zenier)
Subject: Re: VLF Voltage Probe?
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
References: <47lbe4$[e-mail]>
Date: Mon, 6 Nov 1995 22:26:15 GMT
Lines: 14
Sender: [e-mail]

in <47lbe4$[e-mail]>, Jon Jesse wrote:
: Hello,
: I wanted to try some VLF DXing this winter and while thumbing through
: some old mags, I saw an aticle for a "voltage probe".. It concentrated
: on imped. matching rather than high gain.  Trouble is, no diagram or
: parts list.  Does anyone have a diagram for a VLF voltage probe?

Get a hold of Radio-Electronics magazine for 1983.  Ralph Burhans
did a series of articles on VLF antennas.  One of them was a
FET input active antenna, and that or one of the other articles
covered the impeadance matching and all that good stuff.

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



From Unknown Sat Nov 11 07:04:55 1995
Path: news.epix.net!news.sprintlink.net!malgudi.oar.net!catseye.bluemarble.net!usenet.ucs.indiana.edu!vixen.cso.uiuc.edu!uwm.edu!chi-news.cic.net!simtel!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: VLF Voltage Probe?
Date: Thu, 9 Nov 1995 13:15:48
Organization: TRL
Lines: 24
Message-ID: <[e-mail]>
References: <47lbe4$[e-mail]>
NNTP-Posting-Host: pc0126.trl.oz.au
Keywords: VLF voltage probe
X-Newsreader: Trumpet for Windows [Version 1.0 Rev Final Beta #7]


>Hello,>I wanted to try some VLF DXing this winter and while thumbing through
>some old mags, I saw an aticle for a "voltage probe".. It concentrated
>on imped. matching rather than high gain.  Trouble is, no diagram or
>parts list.  Does anyone have a diagram for a VLF voltage probe?
>Thanks and 73...>Jon...WS1K...>[e-mail]

An active antenna should do the job. Typical cricuit may be found in Radio
Electronics (Electronics Now!) for February '89. P51-54. The writer is Rodney
Kreuter. This model is specified from 1 MHz to 30 MHz, but my guess is that
it should work well below 1 MHz. Uses voltage probe telescope antenna, input
FET, and three bi-polar transistors. Full details, including circuit board
layout and parts list (no fancy components). Also, perhaps worth considering
if you're serious;

"Wideband Active Antenna" by J. Barendrecht in Elektor Electronics Mar. '95, P
10-13. Uses 1 metre diameter single turn loop, coupled to a wideband amplifier
(Philips BF981 and 2N5109). DC supply is fed up the connecting coax so that
the loop may be located in a low-noise location. Full details including
circuit board and parts list. Only difficult part (I think, for American
experimenter's) is the magnetic core materials, which are made by a Dutch
outfit.

73, Drew, VK3XU.


From Unknown Sat Nov 11 07:04:56 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!dns.crocker.com!wizard.pn.com!ci-pioneer!pryder!mdulcey
From: [e-mail] (Mark J. Dulcey)
Subject: Re: WANTED INFO: How to build modems.
Reply-To: [e-mail]
Organization: The Buttery
Message-ID: <[e-mail]>
References: <1995Nov4.100849@topaz>
Date: Tue, 7 Nov 1995 14:17:16 GMT
Lines: 16

In article <1995Nov4.100849@topaz>,
New Age; New Times; New Ideas <[e-mail]> wrote:

>       I'm chasing schematics or circut diagrams/proofs full designs
>what ever , to make modems, phone modems , fax modems packet tnc. etc...

Just about all modems these days are built with specialized chip sets
from a few suppliers.  Rockwell and AT&T are the most popular.  The
chip manufacturers will happily supply you with suggested circuits for
using their products.

Unless you're planning to make a lot of modems (at least thousands,
perhaps tens of thousands), it's not worth the trouble, however.  The
small-quantity price of the chips is likely to be more than you would
pay for a complete modem -- and you still have to buy the circuit
boards and other components.


From Unknown Sat Nov 11 07:04:57 1995
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.uoregon.edu!gatech2!pirates!cssun.mathcs.emory.edu!swrinde!howland.reston.ans.net!newsfeed.internetmci.com!btnet!dispatch.news.demon.net!demon!mail2news.demon.co.uk!stevef.demon.co.uk
From: Stephen John Farthing <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WANTED INFO: How to build modems.
Date: Fri, 10 Nov 95 20:26:50 GMT
Organization: The Ministry of Administrative Affairs
Lines: 8
Message-ID: <[e-mail]>
References: <1995Nov4.100849@topaz> <[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: stevef.demon.co.uk
X-Newsreader: Demon Internet Simple News v1.27

The December 1995 issue of Electronics and Wireless World has an article
on how to make a modem. Try [e-mail] for details of getting
a copy. In the UK its easy to find but not sure about the US.
--
Steve Farthing | [e-mail] |
Melksham       RSGB GQRP 7766 BCS Still struggling with the morse code
Wiltshire UK


From Unknown Sat Nov 11 07:04:58 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!mdisea!mothost!schbbs!news
From: [e-mail] (Dan Tayloe )
Subject: Re: What's circulator good for? was Re: How do
Reply-To: [e-mail]
Organization: Motorola Satellite Communications
Date: Tue, 7 Nov 1995 20:24:14 GMT
Message-ID: <[e-mail]>
References: <47m7td$[e-mail]>
Sender: [e-mail] (SCHBBS News Account)
Nntp-Posting-Host: 170.1.5.166
Lines: 20

>>Douglas Braun ([e-mail]) wrote:
>>: There is a nifty RF device called a "circulator".  It has three terminals.
>>: RF energy fed into terminal A comes out terminal B, energy fed into terminal
>>: B comes out terminal C, and energy fed into terminal C comes out terminal A.

>OK, but what are they used for?

>73..Jim

I have seen them used in fragile 900 MHz (cellular base station) power
amplifiers.  The power amplifier output goes into port "A" and comes out
port "B" which is connected to the load (basically, the antenna).  In the
case of mismatch, power reflected from the antenna is reflected back into
port "B", which then appears at port "C", which is a 50 ohm dummy load.

End result? Said fragile amplifer transistors are protected from SWR problems.

- Dan Tayloe, WB0NVB




From Unknown Sat Nov 11 07:04:59 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!druid.borland.com!ico.net!news.zeitgeist.net!bdt.com!miwok!news-out.internetmci.com!internetMCI!newsfeed.internetmci.com!in1.uu.net!ncrgw2.ncr.com!ncrhub6!daynews!ranger!cn2935.DaytonOH.attgis.COM!john.ackermann
From: [e-mail] (John Ackermann)
Subject: Re: What's circulator good for? was Re: How do
X-Nntp-Posting-Host: cn2935.daytonoh.attgis.com
Message-ID: <[e-mail]>
Lines: 27
Sender: [e-mail] (News Administrative Login)
Organization: AT&T Global Information Solutions
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References: <47m7td$[e-mail]> <[e-mail]>
Date: Wed, 8 Nov 1995 14:09:56 GMT

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

>>>Douglas Braun ([e-mail]) wrote about circulators:

>>OK, but what are they used for?

>I have seen them used in fragile 900 MHz (cellular base station) power
>amplifiers.  The power amplifier output goes into port "A" and comes out
>port "B" which is connected to the load (basically, the antenna).  In the
>case of mismatch, power reflected from the antenna is reflected back into
>port "B", which then appears at port "C", which is a 50 ohm dummy load.

>End result? Said fragile amplifer transistors are protected from SWR problems.

>- Dan Tayloe, WB0NVB

A similar use is made in the Motorola UHF Micor radios.  The finals there were
early solid-state UHF devices that were more than a bit fragile, and to
protect them from VSWR Motorola built a circulator into the antenna switch.
Neat design -- the antenna relay switched the C port between the receiver and
a dummy load.

73,
John   AG9V
[e-mail]




From Unknown Sat Nov 11 07:04:59 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!news.nic.surfnet.nl!tuegate.tue.nl!news.iaehv.nl!news
From: Rik Slingerland <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,sci.electronics
Subject: Re: What's circulator good for? was Re: How does
Date: 7 Nov 1995 21:42:45 GMT
Organization: Internet Access Eindhoven, the Netherlands
Lines: 4
Message-ID: <47ojsl$[e-mail]>
References: <47a3ee$[e-mail]> <[e-mail]> <47m7td$[e-mail]> <47o1rb$[e-mail]>
NNTP-Posting-Host: pm1d04.iaehv.nl
Xref: news.epix.net rec.radio.amateur.homebrew:11447 sci.electronics:158741

Another extra (although not too interesting): it limits the amount of RF reflected
to the amplifier, thus limits the SWR. Useful for high power units.

PE1BIZ


From Unknown Sat Nov 11 07:05:00 1995
Path: news.epix.net!news.sprintlink.net!isc-newsserver.isc.rit.edu!jdc3538
From: [e-mail] (CRONIN)
Newsgroups: rec.radio.amateur.homebrew,sci.electronics
Subject: What's circulator good for? was Re: How does "circulator" work?
Date: 7 Nov 1995 00:06:05 GMT
Organization: Rochester Institute of Technology, Rochester, NY
Lines: 8
Message-ID: <47m7td$[e-mail]>
References: <47a3ee$[e-mail]> <[e-mail]>
NNTP-Posting-Host: grace.isc.rit.edu
Xref: news.epix.net rec.radio.amateur.homebrew:11429 sci.electronics:158655

>Douglas Braun ([e-mail]) wrote:
>: There is a nifty RF device called a "circulator".  It has three terminals.
>: RF energy fed into terminal A comes out terminal B, energy fed into terminal
>: B comes out terminal C, and energy fed into terminal C comes out terminal A.

OK, but what are they used for?

73..Jim


From Unknown Sat Nov 11 07:05:01 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!cssun.mathcs.emory.edu!gatech!newsfeed.internetmci.com!news.kei.com!newshost.marcam.com!charnel.ecst.csuchico.edu!xmission!news.cc.utah.edu!news.cs.utah.edu!uplherc.upl.com!usenet
From: "Mel Beyer" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,sci.electronics
Subject: Re: What's circulator good for? was Re: How does "circulator" work?
Date: Mon, 6 Nov 95 20:11:35 PST
Organization: A poorly-installed InterNetNews site
Lines: 17
Message-ID: <47mm8p$[e-mail]>
NNTP-Posting-Host: cccpc3.pacificorp.com
To:  CRONIN <[e-mail]>
In-Reply-To: Your message of 7 Nov 1995 00:06:05 GMT.<47m7td$[e-mail]>
Encoding:  17 TEXT
Xref: news.epix.net rec.radio.amateur.homebrew:11431 sci.electronics:158668


Jim, [e-mail] (CRONIN) <47m7td$[e-mail]>,
wrote

>>Douglas Braun ([e-mail]) wrote:
>>: There is a nifty RF device called a "circulator".  It has three terminals.
>>: RF energy fed into terminal A comes out terminal B, energy fed into
terminal
>>: B comes out terminal C, and energy fed into terminal C comes out terminal A.
>
>OK, but what are they used for?
>
>73..Jim

Put a transmitter on port A, an antenna on port B, and a receiver on port C.
Often used this way in waveguides. Or put a load on the third port and you have
an isolator.


From Unknown Sat Nov 11 07:05:02 1995
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!senator-bedfellow.mit.edu!dragon.pfc.mit.edu!fridberg
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew,sci.electronics
Subject: Re: What's circulator good for? was Re: How does "circulator" work?
Date: 9 NOV 95 15:15:07 GMT
Organization: MIT PLASMA FUSION CENTER
Lines: 29
Message-ID: <[e-mail]>
References: <47o1rb$[e-mail]> <47a3ee$[e-mail]> <[e-mail]> <47m7td$[e-mail]>
NNTP-Posting-Host: cmod3.pfc.mit.edu
Xref: news.epix.net rec.radio.amateur.homebrew:11479 sci.electronics:158974

In a previous article, THOMAS STICHELBOUT <[e-mail]> wrote:
->when energy coming from a goes to b through a circulator,
->in a 3 way terminal, it won't go on the way c, which will be isolated.
->It used for receiver : Imagine an antenna which is plugged on way a, a
->receiver
->on way b , and ground on way C. You don't want your receiver to emit anything
->on
->the antenna. Therefor  you use a circulator : All the energy coming back from
->the receiver will go to the ground and not on the antenna, which is "isolated
->from the receiver" Is that clear enough ?
->If you want to know some more about the subject, try to read books dealing
->with
->hyperfrequencies techniques...
->
Eh.., hm... well, this example is ok, but it's not very often when you worry
about reciever emmitting anything back to antenna. Besides, you can't really
get rid of RF by grounding it. You'd need to put load there. The lot more
common application is when you have tranmsitter and reciever using same antenna
and you want to make sure that transmitted signal going into antenna only,
and recieved signal from antenna  going to reciever only. So, you connect
transmitter to port a, antenna to port b, and reciever to port c, you'll
get signal from transmitter (port a) going to port b (antenna) and nowhere
else, and recieved signal from antenna (port b) going to reciever (port c)
and nowhere else. Another application would be when you want to protect
transmitter from load mismatch and isoltare reflected signal from forward one.
Actually, in all of these examples you can use hybrid as well...

Mike.



From Unknown Sat Nov 11 07:05:04 1995
Newsgroups: rec.radio.amateur.homebrew,sci.electronics
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!gatech2!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: What's circulator good for? was Re: How does "circulator" work?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <47o1rb$[e-mail]> <47a3ee$[e-mail]> <[e-mail]> <47m7td$[e-mail]> <[e-mail]>
Date: Fri, 10 Nov 1995 22:44:23 GMT
Lines: 66
Xref: news.epix.net rec.radio.amateur.homebrew:11501 sci.electronics:159106

In article <[e-mail]> [e-mail] writes:
>In a previous article, THOMAS STICHELBOUT <[e-mail]> wrote:
>->when energy coming from a goes to b through a circulator,
>->in a 3 way terminal, it won't go on the way c, which will be isolated.
>->It used for receiver : Imagine an antenna which is plugged on way a, a
>->receiver
>->on way b , and ground on way C. You don't want your receiver to emit anything
>->on
>->the antenna. Therefor  you use a circulator : All the energy coming back from
>->the receiver will go to the ground and not on the antenna, which is "isolated
>->from the receiver" Is that clear enough ?
>->If you want to know some more about the subject, try to read books dealing
>->with
>->hyperfrequencies techniques...
>->
>Eh.., hm... well, this example is ok, but it's not very often when you worry
>about reciever emmitting anything back to antenna. Besides, you can't really
>get rid of RF by grounding it. You'd need to put load there. The lot more
>common application is when you have tranmsitter and reciever using same antenna
>and you want to make sure that transmitted signal going into antenna only,
>and recieved signal from antenna  going to reciever only. So, you connect
>transmitter to port a, antenna to port b, and reciever to port c, you'll
>get signal from transmitter (port a) going to port b (antenna) and nowhere
>else, and recieved signal from antenna (port b) going to reciever (port c)
>and nowhere else. Another application would be when you want to protect
>transmitter from load mismatch and isoltare reflected signal from forward one.
>Actually, in all of these examples you can use hybrid as well...

He's right, Mike, circulators are used primarily for reverse isolation.
As you note, you terminate port 3 with the characteristic impedance.
You don't short it to ground, which does no good at all, and in fact
guarantees a reflection. In microwave work, it's common to have receiver
radiation since the receiver usually has a mixer as its front end and
can allow LO to leak back toward the antenna. The other major use of
a circulator is to isolate a transmitter PA from VSWR on the antenna
or from out of band components which may enter the PA from the antenna
and mix there to produce intermod which is then reradiated. The latter
problem can happen in a receiver mixer too. Circulators can minimize
either problem. Circulators are also commonly used to isolate an oscillator
from "pulling" by a following stage, and to isolate a driver stage from a
PA so that input tuning of the PA doesn't interact with driver output tuning.

Now a circulator as TR switch isn't too useful because the isolation
typically isn't that good, only about 20 db between port 1 and port
3. Since the transmitter typically puts out watts while the receiver
wants to see no more than microwatts, the isolation is insufficient.
You want something on the order of 60 db (or better) of isolation.
A circulator can't give you that so you have to get it other ways.
For transmitter receiver pairs operating on split frequencies, IE
a typical repeater, you do that with cavity duplexers. For transmitter
receiver pairs operating on the same frequency, the only real way that
they can share a common antenna is by an active TR switch, either a
relay or PIN diodes. A single relay typically only offers about 30 db
of isolation due to capacitance through the NO contacts, but the
relay can be designed to reduce that (rotary relays for example
which rotate the open contacts 90 degrees to each other). But today,
pi or Tee section configured PIN diode switches can offer up to 70 db
of isolation, and that's plenty for most applications. And they're
fast too.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |


From Unknown Sat Nov 11 07:05:06 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!simtel!news00.sunet.se!sunic!news99.sunet.se!erinews.ericsson.se!cnn.exu.ericsson.se!news
From: [e-mail] (Mike Groves)
Newsgroups: rec.radio.amateur.homebrew,sci.electronics
Subject: Re: What's circulator good for? was Re: How does "circulator" work?
Date: Sat, 11 Nov 1995 09:07:40 GMT
Organization: Ericsson Inc.
Lines: 41
Message-ID: <481p4s$[e-mail]>
References: <47o1rb$[e-mail]> <47a3ee$[e-mail]> <[e-mail]> <47m7td$[e-mail]> <[e-mail]>
NNTP-Posting-Host: pc125020.exu.ericsson.se
X-Newsreader: Forte Agent .99b.112
Xref: news.epix.net rec.radio.amateur.homebrew:11508 sci.electronics:159132

On 9 NOV 95 15:15:07 GMT, [e-mail] wrote:

<snip>

>                                                           The lot more
>common application is when you have tranmsitter and reciever using same antenna
>and you want to make sure that transmitted signal going into antenna only,
>and recieved signal from antenna  going to reciever only. So, you connect
>transmitter to port a, antenna to port b, and reciever to port c, you'll
>get signal from transmitter (port a) going to port b (antenna) and nowhere
>else, and recieved signal from antenna (port b) going to reciever (port c)
>and nowhere else. Another application would be when you want to protect
>transmitter from load mismatch and isoltare reflected signal from forward one.
>Actually, in all of these examples you can use hybrid as well...

I sure hope you've never tried what you just described.  The tiniest
reflection coming off your transmit antenna will fry your receiver,
guaranteed.  In fact you don't even need a reflected signal to do
damage, the circulator will take care of that for you.  Huh??  When
you say "and nowhere else" you are assuming a *perfect* circulator.
They don't exist (except in design simulation software).  A small part
of the signal presented to Port A WILL show up on Port C and drive
right into your receiver.

You are correct though, in *theory* on how a circulator works.  Any
signal coming in Port A generally leaves through port B.  Any signal
coming in Port B generally leaves through Port C.  And yes, any signal
coming in Port C will generally leave through Port A.  Hence the name.

The most common usage (as has been mentioned many times) is when Port
C is terminated, usually in 50 ohms.  (If this termination is
"built-in" to the circulator you end up with a 2-port device called an
Isolator.)  Transmitted signals go in Port A and out Port B to the
antenna.  Reflected (and other unwanted) signals coming back down the
antenna feed line, enter back into Port B where they are sent to Port
C where they get terminated.  Very little makes it back to the
transmitter, so it is completely protected (or Isolated) from what
ever impedance lurks on the other side of Port B.

///Mike



From Unknown Sat Nov 11 07:05:06 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Robert Fanfant )
Newsgroups: rec.radio.amateur.homebrew
Subject: WTB: Directional Coupler (QST article)
Date: 8 Nov 1995 05:23:40 GMT
Organization: Netcom
Lines: 11
Message-ID: <47pess$[e-mail]>
NNTP-Posting-Host: ix-sea5-13.ix.netcom.com
X-NETCOM-Date: Tue Nov 07  9:23:40 PM PST 1995


I'd like to build the automatic remote antenna tuning controller in the
Sept 95 QST. This project requires a directional coupler, part number
CU-987... Anyone out there have any ideas as to how I can get my hands
on this part???

-rob  WB7TDU

Email: [e-mail]




From Unknown Sat Nov 11 07:05:08 1995
Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!usenet.eel.ufl.edu!newsfeed.internetmci.com!news.kei.com!newsstand.cit.cornell.edu!newsfeed.cit.cornell.edu!news.tc.cornell.edu!newsserver.sdsc.edu!news.cerf.net!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news
From: Zack Lau <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WTB: directional coupler (QST article)
Date: 9 Nov 1995 15:57:24 GMT
Organization: American Radio Relay League
Lines: 30
Message-ID: <47t8d4$[e-mail]>
References: <47ob0i$[e-mail]>
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To: [e-mail]

[e-mail] (Robert Fanfant ) wrote:
>
>Sept 95 issue of QST had an article on an automatic remote antenna
>tuning controller. I'd like to build it but can't find the directional
>coupler... Part number is CU-987. Can anyone tell me who carries this
>part??? Does anyone on the net have one for sale???
>
>-rob  WB7TDU
>
>E-mail: [e-mail]

According to the author, he bought a couple from Fair Radio
but they sold out.  He said they are quite similar to the 312B4's
used in the Collin's S line.

However, the directional coupler isn't very critical.  The one on
page 22.41 of the 1995 ARRL Handbook ought to work just fine.

Most surplus couplers ought to work as well, as long as they
are for the right impedance (might be some 75 ohm jobs out there)
and the right power level.  You might have to reverse the diodes
if the output voltage is negative, or add 50 ohm dummy loads and
detector diodes, but this shouldn't be that challenging.

Zack KH6CP/1 [e-mail]

Yes, I'm still working on that 2M high directivity
microstrip coupler for QEX but have been too busy
with more important tasks...



From Unknown Sat Nov 11 07:05:09 1995
Path: news.epix.net!news.sprintlink.net!malgudi.oar.net!catseye.bluemarble.net!usenet.ucs.indiana.edu!vixen.cso.uiuc.edu!sdd.hp.com!col.hp.com!usenet.eel.ufl.edu!newsfeed.internetmci.com!in2.uu.net!csn!nntp-xfer-2.csn.net!tali.UCHSC.edu!essex.UCHSC.edu!aldrichf
From: Franklin Aldrich <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: WTB: Meter bezel
Date: Fri, 10 Nov 1995 16:09:53 -0700
Organization: University of Colorado, Health Sciences Center
Lines: 10
Message-ID: <[e-mail]>
NNTP-Posting-Host: essex.uchsc.edu
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Remember those old GE "meters" found in power plants & other heavy-duty
applications? They weigh 2 or 3 pounds, have gray-painted cylindrical
bodies, usually have 0-1 MADC movements.  The scale has 270 degrees, and
may be calibrated in DCV, DCA, PSIG, or whatever. The thick glass bezel
is 4" diameter, with a center hole containing a zero-adjuster. The bezel
is framed by a 4 3/8" square black metal or plastic frame, held in place
with 4 corner screws
I need a replacement glass bezel, with zero-adjuster. If you have one to
spare, please e-mail me your price. Tnx a meg -- Frank Aldrich, WS0W,
Boulder CO.


From Unknown Sat Nov 11 07:05:10 1995
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.umbc.edu!eff!news.duke.edu!news.mathworks.com!newsfeed.internetmci.com!in1.uu.net!interaccess!d164.nb.interaccess.com!user
From: [e-mail] (Dave Moorman)
Newsgroups: rec.radio.amateur.homebrew,sci.electronics
Subject: Re: WWVB reciever?
Date: Wed, 08 Nov 1995 20:29:26 -0600
Organization: InterAccess, Chicago's best Internet Service Provider
Lines: 22
Message-ID: <[e-mail]>
References: <47kcpq$[e-mail]>
NNTP-Posting-Host: d175.nb.interaccess.com
Xref: news.epix.net rec.radio.amateur.homebrew:11462 sci.electronics:158862

In article <47kcpq$[e-mail]>,
[e-mail] (William A Moyes) wrote:

>         Does anyone have a schematic of a WWVB reciever?  I want to use
> it to sync several computers/microcontrollers for some experments
> (basically a frequency refrence).  Something that can also decode the
> current time would be an added bonus. Thanks.

Bill - March 1976 Ham Radio has an article about a reciever and signal
processor for WWVB.  I can send you a copy if you can't get your hands on
that magazine.  Also, a company called Far Circuits, which makes lots of
kits/boarrds, etc., makes a kit which synchronizes an oscillator with WWVB
or WWV (I forget which).  Their address is:

FAR Circuits
18N640 Field Court
Dundee,
Illinis  60118

Dave Moorman, K9SW
Downers Grove,
Illinois


From Unknown Sat Nov 11 07:05:11 1995
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From: [e-mail] (Booth, Thomas G)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WWVB reciever?
Followup-To: rec.radio.amateur.homebrew,sci.electronics
Date: 9 Nov 1995 01:11:13 GMT
Organization: A Turbulent One
Lines: 44
Distribution: usa
Message-ID: <thomas.g.booth-081195173239@160.205.101.24>
References: <47kcpq$[e-mail]> <[e-mail]>
NNTP-Posting-Host: 160.205.101.24

In article <[e-mail]>, [e-mail] (Wayne
Farmer) wrote:
>
> In article <47kcpq$[e-mail]> [e-mail] (William A Moyes) writes:
> >From: [e-mail] (William A Moyes)
> >Subject: WWVB reciever?
> >Date: 5 Nov 1995 23:17:14 -0800
>
> >        Does anyone have a schematic of a WWVB reciever?  I want to use
> >it to sync several computers/microcontrollers for some experments
> >(basically a frequency refrence).  Something that can also decode the
> >current time would be an added bonus. Thanks.
>
> >                        -William Moyes
> >                        [e-mail]
>
> William, since you're on the net, you might want to check out the SNTP (Simple
> Network Time Protocol) system on the Internet.  The Windows Client I'm using
> is WinSNTP.  I can't recall which FTP site I got it from, sorry.  I'm
> following this post with a FAQ file about SNTP, with an appendix on radio
> time transmissions.

Umm, I'm not sure Mr. Moyes' application requires SNTP services, since he
did identify the need for a common frequency reference & time decoding as a
"nice to have" feature.  If Mr. Moyes needs, say, 1 ppm or better frequency
uncertainty between all the clock oscillators in his microcontrollers &
computers (assuming for the moment that's what he's trying to do), I don't
think SNTP is going to be of use.  Besides, his target application may well
involve a system which is isolated from the net.

Mr. Moyes should look up the January thru March 1994 issues of 73 magazine
for a description of a candidate WWVB receiver, along w/ info on a phase
comparator and a "poor man's" ovenized crystal frequency standard.

Decoding the WWVB time code information isn't too tough to do, & you might
want to look at Don Lancaster's old _TTL Cookbook_ for some hints.  Details
on the WWVB format can be found in NIST Special Publication 432, which just
might be available over at your campus library.

Good luck -

TGB

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


From Unknown Sat Nov 11 07:05:12 1995
Path: news.epix.net!news.sprintlink.net!news.clark.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!in1.uu.net!csn!nntp-xfer-2.csn.net!tali.UCHSC.edu!essex.UCHSC.edu!aldrichf
From: Franklin Aldrich <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Xtal source(s)
Date: Thu, 9 Nov 1995 17:34:32 -0700
Organization: University of Colorado, Health Sciences Center
Lines: 7
Message-ID: <[e-mail]>
NNTP-Posting-Host: essex.uchsc.edu
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII

Where, or from whom, can I buy custom-frequency crystals?
Tnx es 73--

Frank Aldrich, WS0W
Boulder CO




From Unknown Thu Nov 16 05:44:34 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!noc.near.net!usenet.continental.com!usenet
From: Paul Christensen <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ** HELP with mic preamp
Date: 14 Nov 1995 23:43:17 GMT
Organization: Continental Cablevision
Lines: 38
Message-ID: <48b9il$[e-mail]>
References: <[e-mail]> <[e-mail]>
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To: [e-mail]

What is really needed here is a source follower circuit using the same
MPF-102 transistor.  I believe this is the circuit as described in the
ARRL handbook.  The source of the FET should be connected to the +8VDC
phantom supply via a 100 Ohm resistor (not 10K as indicated in his
earlier posting). Both sides of this resistor are then bypassed to ground
with 0.01 MFD capacitors.  I prefer metal film types for this, but the
garden variety 100VDC disks should be fine.

Now, the drain is connected to ground via a resistor (Rs).  The exact
value of which is determined by the reciprocal of the FET's
transconductance value.  This is usually found on the FET's packaging as
the "Gm" value.  Typical values for Gm are from 3000 to 5500 uS.
Therefore, the Rs value will be approximately 180 ohms to 330 ohms.  My
two FET interfaces use 330 ohms resitors for Rs.  The audio is then fed
to the transceiver via a coupling capacitor (>10 MFD.) from the junction
of the drain and Rs.

It may be necessary to add the R.F. choke you described in series with
100 ohm resistor that connects to the FET's source.  Additionally, it
doesn't hurt to include one on the input to the FET's gate and at the
sudio output.

Of course the microphone element still connects directly to the FET's
gate.  Some mic preamp circuits show a 100K ohm resistor from the gate to
ground.  I caution people with D104 or similar crystal-cartridge
microphones to use a much higher value.  Presently, I am using a 10
megohm resistor for this, and oftentimes it's not needed at all.  The
crystal element can be thought of as an A.C. generator in series with a
capacitor.  The capacitance of a typical crystal element may not be much
more than 2000 pF - 3000 pF.  Even the slightest loading of the FET's
input will cause low frequency rolloff.

This combination of crystal element and FET source follower preamp
results in an incredibly nice sound for communications audio.

-Paul, N9AZ




From Unknown Thu Nov 16 05:44:35 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!noc.near.net!usenet.continental.com!usenet
From: Paul Christensen <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ** HELP with mic preamp
Date: 14 Nov 1995 23:49:04 GMT
Organization: Continental Cablevision
Lines: 13
Message-ID: <48b9tg$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: 169.152.167.70
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)
To: [e-mail]

Please see my reply to Gary Coffman.  I believe this will answer your
questions.  The bottom line though is that if you're using the FET as a
source-follower (Taking the audio off the FET's drain through a coupling
capacitor), then your 10K ohm P.S. current limiting resistor should be in
the area of 100 ohms, not 10K ohms.  Follow the posting I had written to
Gary.

I've built too many of these circuits that work flawlessly and without
any stray R.F. problems.   In addition to my R.F. choke recommendation,
you should also try bonding the interface box with circuit gound.

-Paul, N9AZ



From Unknown Thu Nov 16 05:44:36 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (PSKH)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 2000 Ohms headphones
Date: 12 Nov 1995 13:21:25 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 7
Sender: [e-mail]
Message-ID: <485dv5$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail] (PSKH)
NNTP-Posting-Host: newsbf02.mail.aol.com

Those airline headphones have a impedance of around  400 OHms per
earpiece.
Connecting them in series will give U 800 Ohm.   That might be close
enough for U.

Or you can use the telephone earpieces from old  telephones.



From Unknown Thu Nov 16 05:44:38 1995
Path: news.epix.net!news.sprintlink.net!nuclear.microserve.net!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: 811A VS 572B Triodes
Date: Wed, 15 Nov 95 13:44:35 GMT
Organization: Microserve Information Systems (800)-380-INET
Lines: 54
Distribution: world
Message-ID: <48e56t$[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

The HF amplifier I use, a Gonset GSB-201, originally came from the
factory with (4) 811A tubes.  Gonset later made another version of
this same amplifier, called the GSB-201 MkII, that used (4) 572B's.

I've been told by one person that the power supply in both versions is
the same, which would mean that regardless of the tube, the amplifier
was designed with 1,500 V on the plates.

Given the fact that maximum rated plate current is nearly identical
for both tube types, changing to 572B's wouldn't appear to have a
major impact on the CW/PEP capability of the amplifier.  However, the
811A's are limited in terms of full duty cycle power, and that's what
I would like to improve.  Total rated plate dissipation with the
811A's is 260 watts.  Even (3) 572B's would provide 480 watts
dissipation, more than sufficient to run 1,000-1,200 watts continuous
key down.

The power transformer in this amplifier is at least as large as in
the Heath SB-220 I had about fifteen years ago, so I'm reasonably
confident the power supply can handle this.  The factory input ratings
for this amp (with 811A's) were:

            1,500 W PEP (SSB), 1,000 W (CW) and 400 W (AM)

Other than the AM rating, there is no mention of full duty cycle power
capability.  From using the amp however, I know that the 811A's show
plate color quickly at 1KW input.

My question is whether anyone knows if the 572B's will be relatively
inefficient with 1,500 V on the plates?  Marketing being what it is,
the fact that Gonset may have used them at this voltage isn't quite
sufficient to convince me that the efficiency will be acceptable.  The
ARRL Handbook shows about 75% efficiency at 1,650 V, but that's in
Class C.

The other possibility for adapting to the 572B's would be to remove
the filter choke from the power supply and to add additional filter
capacitance.  My calculations indicate that the change to a capacitor-
input supply would provide a plate voltage of approximately 2,350 V.
However, other changes would have to be made as well, including new
power supply diodes, tank circuit adjustments, and perhaps a larger
plate tune capacitor.  Further, this would preempt the possibility of
using 811A's in the future.  I'm very reluctant to make these changes
if they're not absolutely necessary in order to use the 572B's.  The
ability to use either tube type by merely plugging them in is a
distinct advantage.  Again, I'm looking for improved duty cycle, not
additional peak power.

Any comments will be appreciated.  I'd especially like to hear from
anyone who owns or has used the MKII version of this amplifier.

73,

Jack  WB3U


From Unknown Thu Nov 16 05:44:38 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!globe.indirect.com!grizzarv
From: [e-mail] (Robert V. Grizzard)
Newsgroups: rec.puzzles,rec.puzzles.crosswords,rec.pyrotechnics,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.rad
Subject: cancel <485q5e$[e-mail]>
Date: 12 Nov 1995 21:51:24 GMT
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From Unknown Thu Nov 16 05:44:40 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!demon!mail2news.demon.co.uk!ifwtech.demon.co.uk
From: Ian G3SEK <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Combining 2 Amplifiers?
Date: Tue, 14 Nov 1995 19:11:12 GMT
Organization: IFWtech
Lines: 45
Message-ID: <[e-mail]>
References: <[e-mail]> <48ad5d$[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: ifwtech.demon.co.uk
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In article: <48ad5d$[e-mail]>  [e-mail] ()
writes:
:
: > Has  any one got any experience (silly question really) of combining
: > the output of 2 (similar) amplifiers at HF?
:
: You cannot combine two *similar* amplifiers, they have to be essentially
: identical. If the signal delay time of both is well matched they can
: be combined with broad band transformers. This is done commercially
: very often, e.g. in VHF.
:

Yes, you can combine similar but non-identical amplifiers. (Where
could you find two truly identical amplifiers anyway?)

Narrowband on 144MHz, G8ROU has combined a 2-4CX250B amp with a
4CX1000 amp - which is pretty long way from identical! He used
ordinary rat-race couplers (4-port, 1.5 wl around), with a length
of coax in series with the input of one amp to roughly equalize
the phase shift if necessary.

Each amplifier is pre-tuned separately, and after that they are
fine-tuned for maximum output when working together, and also for
minimum power lost in the terminating resistor on the output
coupler. The rat-races keep the tuning of each amplifier isolated
from the other.

If one amplifier is producing more power than the other, due to a
difference in gain, some output power is dissipated in the
terminating resistor. Because of the way the voltage vectors
subtract, the power dissipated is surprisingly small, so long as
the power gains of both amplifiers are roughly similar (but you
still need a big terminating resistor until both amps are fully
tuned and working properly together).

That's not quite what Bob asked for, but it's a step in the right
direction.

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



From Unknown Thu Nov 16 05:44:41 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!btnet!demon!mail2news.demon.co.uk!ifwtech.demon.co.uk
From: Ian G3SEK <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Combining 2 Amplifiers?
Date: Wed, 15 Nov 1995 08:39:11 GMT
Organization: IFWtech
Lines: 46
Message-ID: <[e-mail]>
References: <[e-mail]> <48ad5d$[e-mail]> <[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: ifwtech.demon.co.uk
X-Broken-Date: Wednesday, Nov 15, 1995 08.39.11
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Further to my previous  posting...

: If one amplifier is producing more power than the other, due to a
: difference in gain, some output power is dissipated in the
: terminating resistor. Because of the way the voltage vectors
: subtract, the power dissipated is surprisingly small, so long as
: the power gains of both amplifiers are roughly similar ...

Some arithmetic shows just how little power is lost when two
dissimilar amplifiers of output powers P1 and P2 are combined.

At the "combined" port, the voltage vectors are in phase, so:

P_out =   ( SQRT(P1) + SQRT(P2) )^2  / 2

At the terminating port, the voltage vectors subtract:

P_term =  ( SQRT(P1) - SQRT(P2) )^2  / 2

The dividing factor of 2 is because the available output power
from each amplifier is shared equally between the two ports.

Inserting some numbers:

P1       P2        P_out      P_term

1000     1000      2000        0  Identical amplifiers
1000        0       500      500  Only one amp working
1000      500      1457       43  !!!

The first two results are exactly as expected. The third one
may surprise you: the amplifiers are very far from identical,
yet the loss to the terminating port is less than 0.2dB.

If you can handle the phase differences, the gain difference
is a minor problem. According to G8ROU, the trick is to keep
a keen eye on the power being lost in the terminating load.


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



From Unknown Thu Nov 16 05:44:41 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (The2X4)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Combining 2 Amplifiers?
Date: 15 Nov 1995 11:54:58 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 9
Sender: [e-mail]
Message-ID: <48d612$[e-mail]>
References: <[e-mail]>
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There are combiners available for high HF

Contact

EFJ Devices.
111 Ensley ave
Old Hickory, TN  37138

Carl


From Unknown Thu Nov 16 05:44:43 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!alterdial.uu.net!not-for-mail
From: Burt Fisher <[e-mail]>
Newsgroups: rec.puzzles,rec.puzzles.crosswords,rec.pyrotechnics,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.rad
Subject: Re: Do it for the log.
Date: 12 Nov 1995 11:35:52 GMT
Lines: 33
Message-ID: <484m6o$[e-mail]>
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[e-mail] (Bruce Micales) wrote:

>In the first instance, I am clearly stating as to why I want your name..I do
>keep a log of my contacts.  Also this information can be used for sending QSL
>cards.  All of this is quickly said by asking for your name for the log.
>However, I guess I could say "I would like to know your name because I am a
>nice guy,, I am keeping a log, and I might send you a QSL card".  Hmmmm, seems
>a bit to much.

You prove my point that hams could give a damn about YOU they want your
name for the LOG so they can get an impersonal QSL card. Frequently I
hear hams on repeaters ask for a name FOR THE LOG, and not even a log for hams
there. Explain?



>Hams are very personable otherwise you would not have FM voice, AM voice, SSB
>voice, or even ATV.
>Bruce Micales

Be serious.
On voice what PERSONAL things do they say?

#================#=====================================================#
|  Burt Fisher   |  Teacher of video, broadcasting and electronics     |
| Amateur call   |         South Dennis, Ma. (Cape Cod)                |
|    K1OIK       |  The less you say, the more people will remember    |
#================#=====================================================#
| [e-mail]                                [e-mail] |
#======================================================================#




From Unknown Thu Nov 16 05:44:44 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!gatech2!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: DSP for the R2?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]>
Date: Wed, 15 Nov 1995 16:34:39 GMT
Lines: 29

In article <[e-mail]> [e-mail] (John Seboldt) writes:
>In some conversation on another list and privately, some of us were
>musing about the possibility of a DSP for the KK7B R2 receiver design to
>handle audio quadrature, filtering, and maybe multiple modes.
>
>My limited knowledge tells me it would have to be more advanced than the
>usual 8- or 12-bit processors in the garden-variety outboard DSP audio
>filters, maybe more akin to that described in the QST review of the
>Watkins-Johnson receiver, or the boxes Rohde described in his articles.

Well, 12 bits will sort of work, giving you a dynamic range of about
85 db. But you really want more bits. 16 works well if you use AGC,
and 32 bits gives you 160 db, which is more than enough without AGC.
You can use the DSP to generate an AGC signal when the ADC approaches
its limit. Used artfully, even the 45 db range of an 8 bit system
can be useable if the receiver offers single signal capability.

Of course the R2 requires the audio quadrature to achieve single
signal capability, so that means your DSP has to have sufficient
dynamic range to deal with a strong signal on the image channel.
Hence, I'd recomend a minimum sample size of 16 bits. I have used
the Analog Devices kit with the R2. It uses a 16 bit CODEC.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |


From Unknown Thu Nov 16 05:44:44 1995
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!usenet.eel.ufl.edu!newsfeed.internetmci.com!in2.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (J Man 1172)
Newsgroups: rec.radio.amateur.homebrew
Subject: RE: GONSET G-14 CITIZENS COMMUNICATOR ???TUBE RADIO
Date: 15 Nov 1995 00:50:03 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 3
Sender: [e-mail]
Message-ID: <48bv2b$[e-mail]>
Reply-To: [e-mail] (J Man 1172)
NNTP-Posting-Host: newsbf02.mail.aol.com

DOES ANYBODY KNOW ANYTHING ABOUT THIS RADIO?
IT HAS  7 TUBES-MADE BY YOUNG SPRING & WIRE
4 CHANNEL. KNOW POWER CORD BUT SAYS 12V-117VAC


From Unknown Thu Nov 16 05:44:45 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!usc!math.ohio-state.edu!magnus.acs.ohio-state.edu!lerc.nasa.gov!purdue!mozo.cc.purdue.edu!storm.atms.purdue.edu!bap
From: BRETSKI <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Grounding a home made copper Jpole
Date: Tue, 14 Nov 1995 10:35:26 -0500
Organization: Purdue University
Lines: 14
Message-ID: <[e-mail]>
NNTP-Posting-Host: storm.atms.purdue.edu
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Xref: news.epix.net rec.radio.amateur.equipment:21421 rec.radio.amateur.homebrew:11567


I have a copper Jpole up on a mast. I would like to ground it.
How would I do this?

Send flames elsewhere
Thanks.
73 de N9ZFF


BRET A. PENNINGTON /  COMPUTER TECHNICIAN   /EARTH AND ATMOSPHERIC SCIENCES
CIVL 4252 317-494-0678 / PURDUE UNIVERSITY  / WEST LAFAYETTE, INDIANA 47907
[e-mail]/ [e-mail] / speaking only for myself.
/\/\/\/\/\/ __... /\/\/\/\/\/\/\/\ N9ZFF /\/\/\/\/\/ ...__ /\/\/\/\/\/\/\/\



From Unknown Thu Nov 16 05:44:46 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netcom.com!herbr
From: [e-mail] (Herb Rosenberg)
Subject: Help with Shack Grounding techniques?
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
X-Newsreader: TIN [version 1.2 PL1]
Date: Sun, 12 Nov 1995 23:16:10 GMT
Lines: 44
Sender: [e-mail]

Subject: Help with Shack Grounding techniques?
Newsgroups: rec.radio.amateur.misc
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
Summary:
Keywords:

I recently read an article regarding ways to ground the equipment in the
ham shack.  This article suggested using something called "Aluminum
Flashing available at any home improvement store"

Well, I didn't know what "aluminum flashing was, so I went to the home
improvement store.  Seems that there are several things they refer to as
aluminum flashing.

Some were long flat bars of aluminum in 8 foor lengths with widths from
1/2 inch to 1 inches or so.

Others were shaped in a L configuration with a width on each side of 1.5
inches or so.

Then, they showed me these flat sheets of 3 foot by 4 foot metal, that
they said was also called flashing.

The sheets look interesting, since that would seem to provide a large
surface area to use to tie the individual pieces of equipment to.  It
could be pleaced under the rigs, or on the back side of the rig tabel,
but I don't know if that is the "best way".

I am just looking for a good technique to ground all of the HF equipment
and accessories in the shack.  By the way, the shack is on the second floor.

If you are familiar with "flashing" and or have any suggestions on the
best way to ground the equipment, I would appreciate your comments.  I
live in any environment where I have to be extremely sensitive the RFI /
EMI and I want to make sure I do everything on my part.

Thanks and 73's/

Herb - KG6OK



--
[e-mail]


From Unknown Thu Nov 16 05:44:48 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!newsfeed.pitt.edu!gvls1!rossi
From: [e-mail] (Pete Rossi)
Subject: Re: Help with Shack Grounding techniques?
Message-ID: <[e-mail]>
Sender: [e-mail]
Nntp-Posting-Host: gvlf6-a
Organization: Loral Defense Systems-Eagan  -  Paoli, PA
References: <[e-mail]> <[e-mail]>
Date: Wed, 15 Nov 1995 17:50:40 GMT
Lines: 34

In article <[e-mail]> [e-mail] (Gary Coffman) writes:
>In article <[e-mail]> [e-mail] (Herb Rosenberg) writes:
>>I recently read an article regarding ways to ground the equipment in the
>>ham shack.  This article suggested using something called "Aluminum
>>Flashing available at any home improvement store"
>
>What you want is roofing flashing. It comes in a 5 inch width on long
>rolls. You really don't want to use aluminum, however. You want copper
>flashing. Aluminum is too difficult to make good electrical connections,
>that pesky insulating oxide coating you know.


Go to a *real* roofing supply house for *copper* flashing.  Home centers
like Rickel/Channel/Home Depot/etc. generally DO NOT carry copper flashing.

The trick is to find a supplier that will sell it buy the foot.  Some will
only want to see you a 100' roll which will cost a small fortune.

One supplier near me sold copper flashing by the foot in 20 and 24 inch widths.
Then I cut the 24" stuff into 3 inch strips for my grounding installation.
It was a bit more work but my net cost for 3 inch copper strap was only
about $0.75/foot.

Copper ain't cheap!  :-)

... and make sure you use either stainless steel or brass hardware to
bond all of this copper together..   Do not use galvanized hardware.

---

Pete Rossi - WA3NNA
[e-mail]
Loral Defense Systems-Eagan    (formerly  Unisys Government Systems Group)
Valley Forge Engineering Center - Paoli, Pennsylvania


From Unknown Thu Nov 16 05:44:49 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!gatech2!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Help with Shack Grounding techniques?
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]>
Date: Wed, 15 Nov 1995 16:24:33 GMT
Lines: 34

In article <[e-mail]> [e-mail] (Herb Rosenberg) writes:
>I recently read an article regarding ways to ground the equipment in the
>ham shack.  This article suggested using something called "Aluminum
>Flashing available at any home improvement store"

What you want is roofing flashing. It comes in a 5 inch width on long
rolls. You really don't want to use aluminum, however. You want copper
flashing. Aluminum is too difficult to make good electrical connections,
that pesky insulating oxide coating you know.

>The sheets look interesting, since that would seem to provide a large
>surface area to use to tie the individual pieces of equipment to.  It
>could be pleaced under the rigs, or on the back side of the rig tabel,
>but I don't know if that is the "best way".

It isn't. You want all your equipment grounding conductors to tie
to a *single point*.

>If you are familiar with "flashing" and or have any suggestions on the
>best way to ground the equipment, I would appreciate your comments.  I
>live in any environment where I have to be extremely sensitive the RFI /
>EMI and I want to make sure I do everything on my part.

Don't look to grounding to cure RFI/EMi problems. That's just a bandaid
that attempts to suppress a symptom (and often makes it worse not better).
What you want to do in such cases is to solve the source of the problem,
not just try to treat the symptom.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |


From Unknown Thu Nov 16 05:44:50 1995
Path: news.epix.net!news.sprintlink.net!news.inc.net!uwm.edu!vixen.cso.uiuc.edu!news.ecn.bgu.edu!newspump.wustl.edu!newsreader.wustl.edu!lime!jmelson
From: [e-mail] (Jonathan M. Elson)
Newsgroups: rec.radio.amateur.homebrew,sci.electronics
Subject: Re: How does a "circulator" work?
Date: 12 Nov 1995 06:43:33 GMT
Organization: College of Arts and Sciences -- Washington University, St. Louis, Missouri, USA
Lines: 26
Message-ID: <48452l$[e-mail]>
References: <47a3ee$[e-mail]> <[e-mail]>
NNTP-Posting-Host: [e-mail]
X-Newsreader: TIN [version 1.2 PL2]
Xref: news.epix.net rec.radio.amateur.homebrew:11527 sci.electronics:159220

Douglas Braun ([e-mail]) wrote:
: There is a nifty RF device called a "circulator".  It has three terminals.
: RF energy fed into terminal A comes out terminal B, energy fed into terminal
: B comes out terminal C, and energy fed into terminal C comes out terminal A.

The trick to a circulator is that the magnetic field created by the permanent
magnets causes the iron atoms in the ferrite to gyrate - wobble on their
axes like the earth's summer/winter orbit appears to wobble if the sun
was your reference point.  All the iron atoms (or at least a large portion
of them) wobble at the same frequency and in the same direction.  This
wobble is tuned (by magnetic field strength) to the frequency band required.
The incoming energy aligns the atoms not only by frequency, but phase, too.
The RF energy can't go against the field wobble, so it is forced to go
around the circulator in only one direction.

I had this explained to me by a world-renowned microwave engineer in about
one minute, and I know I'm not doing his explanation justice, but I hope
it is understandable.

I understand how microwave circulators work, I'm a little mystified how you
can get a VHF or HF band one to work.  The field strength must be VERY weak
to make the atoms wobble so slowly, and so thermal noise will not allow them
to stay well aligned.  To get good isolation on the reverse path, the
circulator would need LOTS of ferrite between ports, MUCH more than would
fit in a 3" cube.  So, there is probably a trick here, which I don't know
because I've never seen a circulator for lower than, say, L band.


From Unknown Thu Nov 16 05:44:51 1995
Path: news.epix.net!news.sprintlink.net!southwind.net!usenet
From: [e-mail] (sleepy)
Newsgroups: rec.radio.amateur.homebrew
Subject: ic-701
Date: Sat, 11 Nov 1995 16:04:26 GMT
Organization: SouthWind Internet Access, Inc.
Lines: 8
Message-ID: <482eum$[e-mail]>
NNTP-Posting-Host: ict78.southwind.net
X-Newsreader: Forte Free Agent 1.0.82

        i am currently building a 2 meter transverter to accompany an icom
ic701.  does anybody have the pinout of the acc port on the rear,
and/or any information on connecting a transverter to this
transceiver?  please post or email [e-mail]. thanks in
advance.

 n0uge



From Unknown Thu Nov 16 05:44:52 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.fibr.net!news1.crl.com!nntp.crl.com!crl.crl.com!not-for-mail
From: [e-mail] (Donald J. Miller)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Measuring Filter Group Delay?
Date: 15 Nov 1995 10:49:45 -0800
Organization: CRL Network Services      [phone]  [Login: guest]
Lines: 36
Message-ID: <48dco9$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: crl.com
X-Newsreader: TIN [version 1.2 PL2]

John Ackermann ([e-mail]) wrote:
: I'm working on some radio mods for (sort of) high speed packet and want to
: characterize the IF channel performance, and particularly what the bandpass
: response does to data.

: Any suggestions on how to measure the group delay of an IF channel?  I've
: heard of a method using a high-deviation modulated FM signal as input, and
: looking at the output on a spectrum analyzer, but I don't know the details (or
: whether that would really work).

The most straightforward way is to just measure it with a network analyzer.
Most VNA's are quite capable of measuring group delay.

If a network analyzer is unavailable, you must find some other way to
measure phase, as group delay is just -(d[theta]/d[omega]), or minus the
phase slope when plotted with respect to angular frequency.

You could, for example, take a number of data points using a vector
voltmeter.  Use the input of the circuit for your phase reference, and then
take data at closely spaced increments throughout the passband.  After
you have the data, go back and calculate d[theta]/d[omega] between each
of the points.  This is how a network analyzer does the job anyhow.  The
instrument measures phase, and software computes the group delay before
plotting.

If your IF is below 13 MHz, you could use an HP3575A phase gain meter in
place of a vector voltmeter.  The process is the same.

Have fun,


--
-------------------------------------------------
Don Miller         My opinions are my own!
[e-mail]
-------------------------------------------------


From Unknown Thu Nov 16 05:44:53 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!cs.utexas.edu!news.ti.com!news.dseg.ti.com!usenet
From: [e-mail] (D W Hemphill KC5NG)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NE4040  NOVICE BAND???
Date: 15 Nov 1995 18:59:07 GMT
Lines: 9
Message-ID: <48dd9r$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: dhemphill.dseg.ti.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.5

I built a NE4040 recently (NN1G now calls it the "SW-1").  I'll check
in the instruction manual and see what it says.  I imagine it would be
an easy trick to move it into the novice band.  Let me research it and
see what I can find.  Also... I know NN1G has an e-mail address.  Let
me see if I can dig that up also (does anyone have this handy?)

73 / 72,
           Dean KC5NG



From Unknown Thu Nov 16 05:44:54 1995
Path: news.epix.net!smackay
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NE602 sources ?
Date: 13 Nov 1995 20:07:25 GMT
Organization: epix.net
Lines: 19
Message-ID: <4888ht$[e-mail]>
References: <[e-mail]> <47u0v8$[e-mail]> <481os1$[e-mail]>
NNTP-Posting-Host: mango.epix.net
X-Newsreader: TIN [version 1.2 PL2]

I seem to recall the NE604 is a souped up '602.  Think pinouts the same.
Also have seen '602s in Nuts and Volts ads..surplus houses.
73
Scott
W7GSM

Alan Wong (wong@PROBLEM_WITH_INEWS_DOMAIN_FILE) wrote:
: Jim Devenport ([e-mail]) wrote:
: : I just wasted an hour calling my usual sources (Jameco,
:  Digi-Key, etc) as well as multiple searches through the

: I did the same yesterday, but sad to say, it was a bit more then an hour.
: The closest answer I got all day was not until early '96.  My question
: is, can any other part by sub'ed for the NE602?  I've looked through
: the cross ref guides with no luck, but I'm hoping that by some chance
: I'll find one here.

: jh. - n9rbi
:


From Unknown Thu Nov 16 05:44:54 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!psgrain!news.tek.com!gazette!not-for-mail
From: [e-mail] (Ed Burress)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NE602 sources ?
Date: 14 Nov 1995 09:26:34 -0800
Organization: Tektronix, Inc., Wilsonville,  OR.
Lines: 15
Message-ID: <[e-mail]>
References: <47u0v8$[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: sepia.wv.tek.com

In article <[e-mail]> 'AB7HI' Stephen Lee <[e-mail]> writes:
>
>There's an electronics supply house in Kent, Washington which has
>about fifteen of the Signetics NE602 mixer IC's.  They do sell

I just got some from Newark Electronics.  $1.82 in small quanities.
You can get a catalog by calling 1-800-298-3133.  According to the
local rep, they carry every component that Motorolla makes, as well
as Signetics NE602's, and a lot of other things.  Prices vary, and
you may want to shop around, I also payed $7 for a pretty generic
op-amp where a TLO72 would have done fine.

Hope this helps,
Ed Burress
KC7GFX


From Unknown Thu Nov 16 05:44:55 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!delmarva.com!udel!news.udel.edu!diusys!dave
From: [e-mail] (Dave Dabell)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NE602 sources ?
Date: 14 Nov 1995 19:50:52 GMT
Organization: University of Delaware
Lines: 7
Message-ID: <48arus$[e-mail]>
References: <[e-mail]> <47u0v8$[e-mail]>
NNTP-Posting-Host: diusys.cms.udel.edu
X-Newsreader: TIN [version 1.2 PL2]


The RF Parts catalog lists an NE602.  They are in California and
can be reached at 800 737-2787.

73,  dave  wa3u




From Unknown Thu Nov 16 05:44:57 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!meaddata!swiss.ans.net!newsjunkie.ans.net!Rezonet.net!news.pubnix.net!mba!juxta!michael.black
From: [e-mail] (Michael Black)
Date: 14 Nov 95 23:46:42
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NE602 sources ?
Message-ID: <[e-mail]>
Organization: MtlNet (MBA.org) Juxtaposition BBS. [phone]
Lines: 84

Alan Wong (and his email address wasn't in the post)
added to the thread by asking if there were any replacements
for the NE602.

I guess it depends on what you mean by replacement.  Long before
the NE602 came along, there was the MC1496 double-balanced
mixer.  It came out about 1970.  It was used in the amateur
realm for many years, the only real disadvantage of it was
that it required quite a few external resistors to get it
up and running.  ON the other hand, all those resistors meant
that you could adjust things to your liking.

Similar devices came along, made a brief appearance, then
disappeared.  Presumably they did exist, but finding where'
to get them in the small quantities needed by the amateur
was the big problem.  Texas Instruments had one, and I
seem to recall seeing an Intersil data sheet for something.

Then the NE602 came along, and suddenly it was used everywhere.
Also, it came with the descriptor "gilbert-cell mixer".  From
what I've gathered, it is the same type of circuit used in
the venerable MC1496, but the 1496 was never given such a fancy
title.

Of course, one thing in favour of the NE602 is the built in
oscillator.  It can be useful in some cases, while I suppose
in others it is a libiality.

The external parts count of the NE602 is much smaller than
the MC1496.  On the other hand, I hear that it's dynamic
range is not all that great.  Reminds me of a recent thread
in sci.electronics.  SOmebody had built an FM BCB receiver
using a 602 in the first mixer, and it was overloading.
Clearly, the device had been chosen because it was what
is being used in all kinds of published circuits.  Popular
doesn't always make it the right choice.  I've never seen
the data sheet for the NE602, but I do recall reading somewhere
that it had been intended as a second mixer, after some sort
of IF filter, where the need for large dynamic range is not
needed as much.

So finding a device with as few external components as
the 602 might be difficult.  Finding one with an internal
oscillator might be difficult too.  But if you want a
transistor based double-balanced mixer/modulator using
the "gilbert-cell" configuration, it's bound to show up
in other places.

I recall an article in 73 where the mixer in a Signetics
TDA-7000 (have I got the right number?  It's the FM bcb
receiver in an IC) as the product detector in a direct
conversion receiver.  The author mentioned that it had
better dynamic range than the 602.

There is the MC1496.  You'll have to look up a circuit,
and treat it as a black box replacement for the 602,
but it always used to be a good choice.  I am assuming
it's still being made.

Maybe look into those FM receiver IC's intended for
NBFM.  They have mixers to drop to the IF frequencies,
I think some have to mixers, and they just might
use the same type of mixer.  Check the data sheets.

I've also come across a number of IC's in bcb receivers,
for the front ends.  They might be worth looking into
to see if they use suitable mixer circuits.  Of course,
where to get them new is another question.

Also, the data sheet for the MC1590, which is a metal-cased
MC1350p IF amplifier, has a circuit for using it as a mixer.
From what I recall it does work out as a double-balanced
mixer, similar to the circuit of the MC1496.  The bad part
is that there is amplification after the "mixer" part of the
IC.  How much, I don't know since I haven't studied the
circuit much.  ON the other hand, it just might be suitalbe
for simple applications.

Hope this is some help.

    Michael  VE2BVW
--
| Return Address:      [e-mail]
| Standard disclaimer: The views of this user are strictly their own.


From Unknown Thu Nov 16 05:44:58 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Tom Griffin)
Newsgroups: rec.puzzles,rec.puzzles.crosswords,rec.pyrotechnics,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.cb,rec.radio.noncomm,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap,rec.roller-coaster,rec.running,rec.scouting,rec.scuba,rec.skiing.alpine
Subject: Re: NEED CASH?!!...Don't You?
Date: Fri, 10 Nov 1995 04:33:14 -0500
Organization: Netcom
Lines: 17
Message-ID: <481qu5$[e-mail]>
References: <[e-mail]> <47uhb8$[e-mail]>
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Xref: news.epix.net rec.puzzles:52014 rec.puzzles.crosswords:4582 rec.pyrotechnics:37596 rec.radio.amateur.antenna:17036 rec.radio.amateur.digital.misc:12562 rec.radio.amateur.equipment:21330 rec.radio.amateur.homebrew:11515 rec.radio.amateur.misc:94163 rec.radio.amateur.policy:31793 rec.radio.amateur.space:5680 rec.radio.cb:24376 rec.radio.noncomm:4962 rec.radio.scanner:40578 rec.radio.shortwave:65910 rec.radio.swap:50767 rec.roller-coaster:23161 rec.running:45166 rec.scouting:37574 rec.scuba:80139 rec.skiing.alpine:32754

[e-mail] (Bill Nelson) wrote:

>Please people, don't post all sorts of responses to this spam - it will not
>do any good.  What will work is sending a complaint to [e-mail],
>including the complete article.
>
>You will find that the person will have a severe "talking to" by the
>administrator - if the account is not pulled. Most universities have
>a statement in their user agreement that such posts are illegal and
>ground for immediate account revocation.
>
>Bill

No sooner said than done.

Tom



From Unknown Thu Nov 16 05:44:59 1995
Path: news.epix.net!news.sprintlink.net!nuclear.microserve.net!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need Help  - Parallel!
Date: Wed, 15 Nov 95 10:57:08 GMT
Organization: Microserve Information Systems (800)-380-INET
Lines: 19
Distribution: world
Message-ID: <48drcs$[e-mail]>
References: <48dq7b$[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4

   [e-mail] (Thom) wrote:

>Can anyone tell me a simple method to use in the case where a
>specific resistance is needed in a circuit and a value larger than
>that is available.

The formula for the equivalent resistance of two parallel resistors
is their product divided by their sum.

Sorry, I work mostly with spreadsheets so I don't have a Basic formula
for determining one resistor based on the other resistor and the
equivalent resistance.

In the example you cited, placing a 1,000 ohm resistor in parallel
with the 100 ohm yields 90.9 ohms.

73,

Jack  WB3U


From Unknown Thu Nov 16 05:45:00 1995
Path: news.epix.net!news.sprintlink.net!news.dgsys.com!usenet
From: [e-mail] (Noel Anderson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Needed: Small Quantity Parts Source
Date: Sat, 11 Nov 1995 06:48:07 GMT
Organization: Digital Gateway Systems
Lines: 5
Message-ID: <481433$[e-mail]>
NNTP-Posting-Host: 205.231.217.104
X-Newsreader: Forte Free Agent 1.0.82

I need a mail order small quantity electronic parts source (resistors,
capacitors, etc).....I'm building a home brew QRP rig and can get what
I need at the local radio Shack.....Noel Anderson NI1Q
Connecticut......Thanks



From Unknown Thu Nov 16 05:45:00 1995
Path: news.epix.net!news.sprintlink.net!gatech2!pirates!cssun.mathcs.emory.edu!swrinde!newsfeed.internetmci.com!psgrain!rainrgnews0!pacifier!news
From: jgoecks <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Needed: Small Quantity Parts Source
Date: 13 Nov 1995 22:29:45 GMT
Organization: Pacifier BBS, Vancouver, Wa.  ([phone])
Lines: 16
Message-ID: <488gsp$[e-mail]>
References: <481433$[e-mail]>
NNTP-Posting-Host: ip79.van3.pacifier.com

[e-mail] (Noel Anderson) wrote:
>
> I need a mail order small quantity electronic parts source (resistors,
> capacitors, etc).....I'm building a home brew QRP rig and can get what
> I need at the local radio Shack.....Noel Anderson NI1Q
> Connecticut......Thanks
>
Mouser 1-800-346-6873
Digi-Key 1-800-344-4539
are both good sources for small quantity parts.





Jim Goecks


From Unknown Thu Nov 16 05:45:01 1995
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!agate!newsxfer.itd.umich.edu!nntp.cs.ubc.ca!unixg.ubc.ca!van-bc!io.org!chi-news.cic.net!newsfeed.internetmci.com!in2.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!SantaFe!usenet
From: Jim Potter <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Needed: Small Quantity Parts Source
Date: Mon, 13 Nov 1995 19:02:42 -0800
Organization: JP Accelerator Works, Inc.
Lines: 21
Message-ID: <[e-mail]>
References: <481433$[e-mail]>
NNTP-Posting-Host: 198.59.109.140
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To: Noel Anderson <[e-mail]>

Noel Anderson wrote:
>
> I need a mail order small quantity electronic parts source
(resistors,
> capacitors, etc).....I'm building a home brew QRP rig and can get
what
> I need at the local radio Shack.....Noel Anderson NI1Q
> Connecticut......Thanks

One good source is DigiKey: 1-800-344-4539.
URL: http://www.digikey.com

There are others, but I've had good luck with DigiKey.

Jim

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


From Unknown Thu Nov 16 05:45:02 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!news1.i1.net!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Needed: Small Quantity Parts Source
Date: 15 Nov 1995 05:57:57 GMT
Organization: Internet 1st, Inc.
Lines: 14
Message-ID: <48bvh5$[e-mail]>
References: <481433$[e-mail]>
NNTP-Posting-Host: slip-240.i1.net
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

>   [e-mail] (Noel Anderson) writes:
>  I need a mail order small quantity electronic parts source (resistors,
>  capacitors, etc).....I'm building a home brew QRP rig and can get what
>  I need at the local radio Shack.....Noel Anderson NI1Q
>  Connecticut......Thanks
>
>
>>>>
TRY MEGA PRODUCTS
314-291-7618
ST LOUIS MO
HAVE SMALL PARTS HV CAPS HV RELAYS
TUBES RF PARTS CONECTORS 10,000 SQ FT ELECTRONIC SURPLUS
CALL OR LEAVE E MAIL THANKS BOB


From Unknown Thu Nov 16 05:45:03 1995
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!gatech2!usenet.eel.ufl.edu!newsfeed.internetmci.com!in1.uu.net!news.uiowa.edu!crpl.cedar-rapids.lib.ia.us!SABINW
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Noise gen as tracking gen
Date: 11 Nov 1995 10:42:16 GMT
Organization: Cedar Rapids Public Library, Cedar Rapids, IA,  52401
Lines: 3
Distribution: world
Message-ID: <481um8$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: crpl.cedar-rapids.lib.ia.us

Suggest QST article May 1994 p.37 regarding calibrated noise source
and its use as a tracking gen. Bill Sabin W0IYH



From Unknown Thu Nov 16 05:45:04 1995
Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!usenet.eel.ufl.edu!gatech2!pirates!cssun.mathcs.emory.edu!swrinde!cs.utexas.edu!geraldo.cc.utexas.edu!usenet
From: [e-mail] (Larry Braden)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: OSCILLATORS USING MMIC?
Date: 11 Nov 1995 04:51:46 GMT
Organization: University of Texas at Austin
Lines: 12
Message-ID: <481a52$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: slip-21-4.ots.utexas.edu
X-Newsreader: WinVN 0.92.6+

Thanks to everyone who wrote in replies concerning using MMICs
in oscillator applications.  I think, so far, that the consensus is
that they are not particularly well-suited for oscillators, but are
very useful for many common rf amplifier applications, and are
inexpensive enough to be used for low frequencies HF applications as
well as micro-waves.  The fact that they are 50 ohms impedance is nice
for a lot of common ham radio applications, too.  I am going to get a
nice selection of these devices to have handy, check out available
data sheets, application notes, and books, and use them for some future
projects. Thanks again.

73 KC5CWG - Larry Braden


From Unknown Thu Nov 16 05:45:05 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: OSCILLATORS USING MMIC?
Date: 11 Nov 1995 16:42:52 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 16
Sender: [e-mail]
Message-ID: <4835cs$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

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

>A few months ago Electronics and Wireless World had an article on this.
>I think it was by Ian Hickman, one of their regular contributors. I
>don't think it was a particularly useful oscillator, however, in terms
>of stability, purity, etc.
>
>Leon

I wish I would have read these responses before spending a few days
looking at MMIC amps in an oscillator. What I found certainly agrees with
the posts, the only way a MMIC was stable and reasonably clean was when
the feedback path had level limiting and narrow band (hi-Q) feedback with
180 degree phase shift.
Tom


From Unknown Thu Nov 16 05:45:06 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!news.zynet.com!tesuque.cs.sandia.gov!ferrari.mst6.lanl.gov!newshost.lanl.gov!usenet
From: Jim Devenport <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: OSCILLATORS USING MMIC?
Date: 13 Nov 1995 17:22:24 GMT
Organization: Los Alamos National Laboratory
Lines: 21
Message-ID: <487usg$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: jdport.lanl.gov
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 32bit)


Heh, can't resist throwing in my 2 cents worth.  In my
experience the term "Unconditionally Stable" is a misnomer and
easily misunderstood.  Invariably when you read the fine print
there are "conditions" attached to the "unconditionally stable"
claims.  Whether with op amps or mmics such as the MAR-1, I
have found that they yes, oscillate actually rather EASILY
unless careful attention is paid to layout, input/output
impedances, etc.  Whether they can oscillate at a particular
frequency of choice sounds a bit chancy according to my
esteemed colleague Mr. Coffman... I've never INTENTIONALLY used
one for an oscillator but have lots of experience trying to
tame mmic circuits acting as oscillators but designed as amps
:)
--
*********** Jim Devenport WB5AOX **************
*      PO Box 445, McIntosh NM 87032          *
*        http://nis-www.lanl.gov/~jdport/     *
***********************************************




From Unknown Thu Nov 16 05:45:07 1995
Path: news.epix.net!news.sprintlink.net!in2.uu.net!mack.rt66.com!usenet
From: [e-mail] (Kevin  AstirCS "1U"   KO0B)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Pin Diode Switching ?
Date: Wed, 15 Nov 1995 12:42:48 -0800 (PST)
Organization: Rt66.COM, Public Internet Access in New Mexico
Lines: 41
Message-ID: <48dfj4$[e-mail]>
References: <488jb5$[e-mail]>
NNTP-Posting-Host: 192.153.24.32
X-Newsreader: Forte Free Agent v0.38

[e-mail] (John Frank) wrote:

>       I am looking at using pin diodes to replace the mechanical
>switches in my cable tv switching box.

Why bother with expensive, hard to find PIN diodes?  at VHF, 1N914s
would work fine,  since you aren't transmitting, you can keep them
forward biased, and you don't need any carrier lifetime to keep a
reversed biased diode on.  put 2 or three in series with spreading
resistors of 10Meg or so if isolation is a problem..also reverse bias
the bejeezus out of them in the off state.  Using a "T" configuration
is the best bet..2 reverse biased devices in series, with a forward
biased shunt to ground in between.

Also take care with layout, you won't have too much trouble getting
more stray capacitance than a 12V reverse biased '914s.

PIN diodes are required only at low frequencys (HF), and high signal
levels.   The large signal cancels the forward bias of the ON devices,
and the carrier lifetime must be long enough to ride out a half-cycle
of the lowest transmitted frequency.   The amount of signal at cable
subscriber drop is practically nil, as it simulates what an antenna
would pick up in over-the-air TV , so you should easilly be able to
keep most any diode forward biased. in this application.

You could adapt any of the schemes used to diode switch, for example,
IF filters, to tthis application.  The old handbook PIN switch circuit
would be okay if you modified it to put "OFF" devices under higher
reverse bias, to aid isolation.

BUT: for all the trouble you'd go to...you know a relay works really
well!  I don't know of anyone running QSK on thier cable system :-)

Buy 2 relays, and tape the second one inside the box, in case the
first one ever fails..this will be cheaper than diode switching
circuit!

-73-
KO0B




From Unknown Thu Nov 16 05:45:08 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!DIALix!brisbane.DIALix.oz.au!not-for-mail
From: [e-mail] (Murray Kelly)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Q: Matching caps and inductors
Date: 11 Nov 1995 22:02:13 +1000
Organization: DIALix Services, Brisbane, Australia.
Lines: 27
Sender: [e-mail]
Message-ID: <4823c5$lt6$[e-mail]>
References: <47ci8d$[e-mail]> <[e-mail]>
NNTP-Posting-Host: [e-mail]
Keywords: Matching L and C

[e-mail] (Drew Diamond) writes:
>Kari, see if you can get a copy of; "Build this L-C Checker" by Jack Najork,
>W5FG in Ham Radio (USA) Dec. '88. Jack uses a Colpitts oscillator, to which
>are applied your unknown coils and capacitors. If you have access to a
>frequency counter (or another calibrated receiver), you should be able to
>match components to well within 1%. Use this simple formula;

>CpF = 25330 divided by (frequency MHz squared X LuH), and

>LuH = 25330 divided by (frequency MHz squared X CpF).

>73, Drew, VK3XU.


Another idea is to use an MFJ207 SWR analyser. By arranging the cap.
and coil in series and putting a 50R resistor in series too, the
reactance of the cap and coil are almost equal and opposite so that
all the MFJ207 sees is the 50R. It gives a very deep dip. The better
the q of the coil the closer to 1:1 you get.

As Drew says, get the frequency with a receiver, a counter, or better,
an analyser with the digital readout.

Give it a try if you can borrow the meter.

Cheers. Murray Kelly. vk4aok.



From Unknown Thu Nov 16 05:45:09 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!spcuna!news.columbia.edu!konichiwa.cc.columbia.edu!jbaltz
From: [e-mail] (Jerry B Altzman)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QEX
Date: 15 Nov 1995 15:49:45 GMT
Organization: double ionizers association
Lines: 15
Message-ID: <48d26p$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: konichiwa.cc.columbia.edu

In article <[e-mail]>,
Jay Wicklund  <[e-mail]> wrote:
>Will wonders never cease.....There have been a couple of threads
>regarding the publication of QEX (and where its gone).  Just for

For the record, most of those threads are probably my fault.

>info, I just got the SEpt issue.

I got my Sept QEX issue yesterday, only about 6 weeks late. Now I'm waiting
for my Oct. issue...

//jbaltz
jerry b. altzman   Entropy just isn't what it used to be      [phone]
[e-mail]   [e-mail]  KE3ML  (HEPNET) NEVIS::jbaltz


From Unknown Thu Nov 16 05:45:10 1995
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!news.ti.com!news.dseg.ti.com!usenet
From: [e-mail] (D W Hemphill KC5NG)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QRP KEYER CKT???
Date: 15 Nov 1995 19:02:45 GMT
Lines: 15
Message-ID: <48ddgl$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: dhemphill.dseg.ti.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.5

<snip>
I DONT WANT TO USE THE CURTIS CHIP AND DOESNT NEED TO BE FANCY.
<snip>

Why not the Curtis chip?  You can build a very, very tiny keyer using
the 8044 chip, and it will work quite well.  The power drain of this
chip is so small that you don't even need an on/off switch to keep it
from draining your batteries!  It's also highly RF-resistant if you
build the circuit like they suggest.  I've included Curtis keyers in
a number of homebuilt and kit-built QRP rigs, as well as several HF
transceivers (Heath, Ten-Tec, Kenwood TS-430S, etc).  I've built them
on pieces of 0.1" solder-grid board that were 1" x 1.25".  You can't
get any smaller than that!
                                 73 de KC5NG



From Unknown Thu Nov 16 05:45:11 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Robert Wold, Jr. )
Newsgroups: rec.radio.amateur.homebrew
Subject: QRP-help /c coils for Neophyte Rcvr
Date: 11 Nov 1995 15:48:42 GMT
Organization: Netcom
Lines: 8
Message-ID: <482gkr$[e-mail]>
NNTP-Posting-Host: ix-sac6-16.ix.netcom.com
X-NETCOM-Date: Sat Nov 11  7:48:43 AM PST 1995

Hi,  As a school project we are building a small SW radio receiver.  We
chose the Neophyte from QST but are having difficulty finding the 10.7
MHz If transformers (7:1 turns ratio, green core) that are called for.
Can we wind something up on a torrid that will work?  Or do you know of
a source of these coils?  Any suggestions?

Thank you from the young ladies @ Loretto HS Sacramento AP physics
class.  :-)     :-)   (-:   <-:   ;-}


From Unknown Thu Nov 16 05:45:12 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!server.iadfw.net!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: R/C Video
Date: Wed, 15 Nov 1995 07:07:21 GMT
Organization: Internet America
Lines: 10
Message-ID: <48btb9$[e-mail]>
NNTP-Posting-Host: 206.66.14.92
X-Newsreader: Forte Free Agent 1.0.82

Hi
I am looking for small atv xmitters and cameras to put into R/C
airplanes. Does anyone out there have any experence doing this
and also any info on resources on wher to find equipment ?
Thanks
Fred N5GZY
[e-mail]





From Unknown Thu Nov 16 05:45:12 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!munnari.OZ.AU!news.uwa.edu.au!classic.iinet.com.au!swing.iinet.net.au!usenet
From: [e-mail] (Earle Fraser)
Newsgroups: rec.radio.amateur.homebrew
Subject: Radio Links Galore
Date: Mon, 13 Nov 1995 16:54:11 GMT
Organization: iiNet Technologies
Lines: 9
Message-ID: <487sp8$[e-mail]>
NNTP-Posting-Host: grunge195.nv.iinet.net.au
X-Newsreader: Forte Free Agent 1.0.82

Hi OM,

Have a look at my Amateur Radio related links @
www.iinet.net.au/~fraser. Let me know of any additions or corrections.

73's de Earle - VK6EEF@VK6WFH.#PER.#WA.AUS.OC

[e-mail]



From Unknown Thu Nov 16 05:45:13 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!simtel!torn!nott!bcarh189.bnr.ca!nrtphba6.bnr.ca!brtph500.bnr.ca!news
From: Raul Salazar <[e-mail]>
Newsgroups: soc.culture.venezuela,soc.culture.uruguay,soc.culture.spain,soc.culture.peru,soc.culture.mexican.american,soc.culture.latin-america,soc.culture.ecuador,soc.culture.cuba,soc.culture.colombia,soc.culture.chile,soc.culture.bolivia,soc.culture.argentina,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.digital.misc,rec.radio.amateur.antenna
Subject: Re: RADIOAFICIOANDOS ENLAZADOS VIA INTERNET
Date: 14 Nov 1995 19:28:32 GMT
Organization: Bell Northern Research
Lines: 6
Message-ID: <48aql0$[e-mail]>
References: <[e-mail]> <48844s$[e-mail]>
NNTP-Posting-Host: brtph597.bnr.ca
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1 (X11; I; HP-UX A.09.05 9000/712)
X-URL: news:48844s$[e-mail]
Xref: news.epix.net soc.culture.venezuela:42960 soc.culture.uruguay:4322 soc.culture.spain:81016 soc.culture.peru:10282 soc.culture.mexican.american:7617 soc.culture.latin-america:38780 soc.culture.ecuador:3956 soc.culture.cuba:29678 soc.culture.colombia:11600 soc.culture.chile:30851 soc.culture.bolivia:9913 soc.culture.argentina:26700 rec.radio.amateur.misc:94308 rec.radio.amateur.homebrew:11572 rec.radio.amateur.equipment:21427 rec.radio.amateur.digital.misc:12627 rec.radio.amateur.antenna:17115

Por primera vez veo un cross-posting que valio
la pena.
Ojala que este tipo de informacion (calidad)
continue.
Raul



From Unknown Thu Nov 16 05:45:15 1995
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.msfc.nasa.gov!pendragon.jsc.nasa.gov!ames!cronkite.cisco.com!cisco.com!henniger
From: [e-mail] (Mick Henniger)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ramsey FX440
Date: 13 Nov 95 21:52:47 GMT
Organization: cisco Systems
Lines: 36
Message-ID: <[e-mail]>
References: <47mnju$[e-mail]> <[e-mail]> <481akt$[e-mail]>
NNTP-Posting-Host: nacho.cisco.com

In <481akt$[e-mail]> [e-mail] (Mark LaPolt) writes:

>>
>>        The phone number is 1(716)924-4560 and have a good description of
>>the problem.
>>
>>
>>                        Mark Wyman
>>                        [e-mail]

>       I'd be VERY suprised if there were NOT people who got them to work.
>Unfortunately, I can't seem to find one. At least not one who did not have a
>significant amount of trouble with the radio. I've got the project on the back
>burner for now, but hope to get back into it in the coming week. I'll keep the
>tech support # on hand for last resort, but I want to try to solve this one
>meself.

>       Tnx and 73's
>       Mark LaPolt N1UNE
>       [e-mail]

I too have had a reasonable amount of trouble with the FX-440.  It seems
that they have a sawtooth output from the synthesizer that is used
after averaging to keep the transmitter on (if the PLL's not locked, you
probably don't want to be transmitting..) unfortunately the layout is
such that this sawtooth causes lots of noise in the (audio frequency
sawtooth) transmit audio path.  Sent to Ramsey, but they couldn't get
rid of the noise.  The noise precludes even 1200 baud packet.
I finally disabled the output from the Synthesizer, to effectively
enable the transmitter always.  Now I only have to deal with the
weak mic audio and hit-or-miss PLL lock problems.

Theoretically, the design will work but...

Mick



From Unknown Thu Nov 16 05:45:15 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!mr.net!news.mr.net!mixer.visi.com!usenet
From: [e-mail] (Ed Marciniak)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ramsey FX440
Date: 14 Nov 1995 13:10:58 GMT
Organization: Marciniak Tech Services
Lines: 10
Message-ID: <48a4h2$[e-mail]>
References: <47mnju$[e-mail]> <[e-mail]> <481akt$[e-mail]> <[e-mail]>
NNTP-Posting-Host: mts.visi.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.6

I haven't had a chance to look at the schematic and board for one yet but I
have one question about this kit:

Could I use a circulator to get this radio to run full duplex?


Also one comment from reading earlier posts (to someone at Ramsey ):

If spreading the coils helps, why not add an adendum to the book?



From Unknown Thu Nov 16 05:45:17 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.zynet.com!tesuque.cs.sandia.gov!ferrari.mst6.lanl.gov!newshost.lanl.gov!usenet
From: Jim Devenport <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ramsey FX440
Date: 14 Nov 1995 19:54:28 GMT
Organization: Los Alamos National Laboratory
Lines: 22
Message-ID: <48as5k$[e-mail]>
References: <47mnju$[e-mail]> <[e-mail]> <481akt$[e-mail]> <[e-mail]> <48a4h2$[e-mail]>
NNTP-Posting-Host: jdport.lanl.gov
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 32bit)
To: [e-mail]


A circulator might well cost more than the radio itself.  I
doubt you can easily make the FX440 run full duplex without
adding some separate audio stages, part of the audio is
switched between transmit and receive.  The selectivity isn't
good enough to run good full duplex either.  I'd suggest
Hamtronics separate transmit and receive modules instead,
that's what I use in my homebrew 224.94 MHZ remote
base/repeater, very happy with them though they do cost quite a
bit more.  At 440 MHZ with 5 MHZ separation between transmit
and receive you can very easily run separate TX and RX
antennas, or used duplexers can be had fairly reasonably priced
compared to 146 MHZ units, but you still need good clean
transmitters and selective receivers with high dynamic range
performance to run full duplex.
--
*********** Jim Devenport WB5AOX **************
*      PO Box 445, McIntosh NM 87032          *
*        http://nis-www.lanl.gov/~jdport/     *
***********************************************




From Unknown Thu Nov 16 05:45:18 1995
Path: news.epix.net!news.sprintlink.net!nuclear.microserve.net!pinetree
From: [e-mail] (WB3U)
Newsgroups: rec.puzzles,rec.puzzles.crosswords,rec.pyrotechnics,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.cb,rec.radio.noncomm,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap,rec.roller-coaster,rec.running,rec.scouting,rec.scuba,rec.skiing.alpine
Subject: Replies to Burt Fisher are Spamming the Net
Date: Mon, 13 Nov 95 17:37:40 GMT
Organization: Microserve Information Systems (800)-380-INET
Lines: 9
Distribution: world
Message-ID: <489a3b$[e-mail]>
References: <[e-mail]> <47uhb8$[e-mail]> <481qu5$[e-mail]> <4825eh$[e-mail]>
NNTP-Posting-Host: pinetree.microserve.com
X-Newsreader: News Xpress Version 1.0 Beta #4
Xref: news.epix.net rec.puzzles:52078 rec.puzzles.crosswords:4604 rec.pyrotechnics:37658 rec.radio.amateur.antenna:17107 rec.radio.amateur.digital.misc:12619 rec.radio.amateur.equipment:21418 rec.radio.amateur.homebrew:11566 rec.radio.amateur.misc:94290 rec.radio.amateur.policy:31853 rec.radio.amateur.space:5743 rec.radio.cb:24437 rec.radio.noncomm:4975 rec.radio.scanner:40688 rec.radio.shortwave:66056 rec.radio.swap:50964 rec.roller-coaster:23193 rec.running:45265 rec.scouting:37641 rec.scuba:80283 rec.skiing.alpine:32899

To all readers:

Please check the "Post To:" or "Newsgroups:" listing in your
newsreader before responding to Burt Fisher.  He is spamming many
groups with his posts and your followups are doing the same.

Thanks,

Jack


From Unknown Thu Nov 16 05:45:18 1995
Path: news.epix.net!news.sprintlink.net!news.clark.net!not-for-mail
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Request for help w/portable satcom
Date: 12 Nov 1995 17:44:19 GMT
Organization: Clark Internet Services, Inc., Ellicott City, MD USA
Lines: 13
Message-ID: <485bpj$[e-mail]>
NNTP-Posting-Host: clark.net
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=ISO-8859-1
Content-Transfer-Encoding: 8bit
X-Newsreader: TIN [UNIX 1.3 950726BETA PL0]


[ Article reposted from rec.radio.amateur.space ]
[ Author was  ]
[ Posted on 12 Nov 1995 17:39:29 GMT ]

I am planning a hiking and backpacking trip and would like to try
portable packet ops via satellite. I am familiar with packet but have
never done any sat work.  Is it feasbile to do satellite packet in the
field with a handheld and "portable" antenna?  Any suggestions/advice
would be much appreciated.  Thanks.

Craig Peterson, N3DCT
[e-mail]


From Unknown Thu Nov 16 05:45:20 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!alterdial.uu.net!not-for-mail
From: Burt Fisher <[e-mail]>
Newsgroups: rec.radio.swap,rec.radio.shortwave,rec.radio.scanner,rec.radio.amateur.space,rec.radio.amateur.policy,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.digital.misc,rec.radio.amateur.antenna
Subject: Rules of ham DUMB.
Date: 11 Nov 1995 21:42:40 GMT
Lines: 22
Message-ID: <4835cg$[e-mail]>
References: <NEWTNews.816104817.1257.amsoft@486dx4_120>
NNTP-Posting-Host: 199.172.47.193
Mime-Version: 1.0
Content-Type: text/plain
Content-Transfer-Encoding: 7bit
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Ham operator Jokes:

1.  What is the thinnest book in the world?
    What hams know about women.

2.  How does a ham take a bubble bath?
    He eats beans for dinner.

3.  What's a ham's idea of foreplay?
    A half hour of contesting.

4.  How can you tell if a ham is sexually excited?
    If he's still breathing.

5.  How many hams does it take to change a roll of toilet paper?
     We don't know...it has never happened.

6.  What's a ham's idea of helping with the housework?
     Lifting his leg so you can vacuum.

7.  What does a ham consider a seven course meal?
     A hot dog and a six pack of beer.


From Unknown Thu Nov 16 05:45:20 1995
Path: news.epix.net!news.sprintlink.net!newsat!uswc.uswest.com!usenet
From: "Dennis A. Mason" <damason>
Newsgroups: rec.radio.swap,rec.radio.shortwave,rec.radio.scanner,rec.radio.amateur.space,rec.radio.amateur.policy,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.digital.misc,rec.radio.amateur.antenna
Subject: Re: Rules of ham DUMB.
Date: 12 Nov 1995 03:09:03 GMT
Organization: USWest SA news server
Lines: 2
Message-ID: <483ogf$[e-mail]>
References: <NEWTNews.816104817.1257.amsoft@486dx4_120> <4835cg$[e-mail]>
NNTP-Posting-Host: 151.116.178.206
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (X11; I; SunOS 5.4 sun4m)
X-URL: news:4835cg$[e-mail]
Xref: news.epix.net rec.radio.swap:50812 rec.radio.shortwave:65931 rec.radio.scanner:40606 rec.radio.amateur.space:5690 rec.radio.amateur.policy:31805 rec.radio.amateur.misc:94188 rec.radio.amateur.homebrew:11525 rec.radio.amateur.equipment:21346 rec.radio.amateur.digital.misc:12573 rec.radio.amateur.antenna:17053

well burt sounds like you are very educated.



From Unknown Thu Nov 16 05:45:22 1995
Path: news.epix.net!news.sprintlink.net!news.inc.net!uwm.edu!lll-winken.llnl.gov!decwrl!amd!netcomsv!uu4news.netcom.com!netcomsv!uu3news.netcom.com!ix.netcom.com!netnews
From: [e-mail] (Randol D. Williams )
Newsgroups: rec.radio.swap,rec.radio.shortwave,rec.radio.scanner,rec.radio.amateur.space,rec.radio.amateur.policy,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.digital.misc,rec.radio.amateur.antenna
Subject: Re: Rules of ham DUMB.
Date: 12 Nov 1995 03:21:00 GMT
Organization: Netcom
Lines: 27
Message-ID: <483p6s$[e-mail]>
References: <NEWTNews.816104817.1257.amsoft@486dx4_120> <4835cg$[e-mail]>
NNTP-Posting-Host: ix-mia3-19.ix.netcom.com
X-NETCOM-Date: Sat Nov 11  7:21:00 PM PST 1995
Xref: news.epix.net rec.radio.swap:50826 rec.radio.shortwave:65949 rec.radio.scanner:40610 rec.radio.amateur.space:5693 rec.radio.amateur.policy:31810 rec.radio.amateur.misc:94194 rec.radio.amateur.homebrew:11526 rec.radio.amateur.equipment:21350 rec.radio.amateur.digital.misc:12575 rec.radio.amateur.antenna:17057

In <4835cg$[e-mail]> Burt Fisher <[e-mail]> writes:

>
>Ham operator Jokes:
>
>1.  What is the thinnest book in the world?
>    What hams know about women.
>
>2.  How does a ham take a bubble bath?
>    He eats beans for dinner.
>
>3.  What's a ham's idea of foreplay?
>    A half hour of contesting.
>
>4.  How can you tell if a ham is sexually excited?
>    If he's still breathing.
>
>5.  How many hams does it take to change a roll of toilet paper?
>     We don't know...it has never happened.
>
>6.  What's a ham's idea of helping with the housework?
>     Lifting his leg so you can vacuum.
>
>7.  What does a ham consider a seven course meal?
>     A hot dog and a six pack of beer.

What kinda beer?  Can or bottle?


From Unknown Thu Nov 16 05:45:23 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!castle.nando.net!news
From: Dave Hockaday <[e-mail]>
Newsgroups: rec.radio.swap,rec.radio.shortwave,rec.radio.scanner,rec.radio.amateur.space,rec.radio.amateur.policy,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.digital.misc,rec.radio.amateur.antenna
Subject: Re: Rules of ham DUMB.
Date: 13 Nov 1995 02:19:37 GMT
Organization: News & Observer Public Access
Lines: 41
Message-ID: <4869vp$[e-mail]>
References: <NEWTNews.816104817.1257.amsoft@486dx4_120> <4835cg$[e-mail]> <483p6s$[e-mail]>  <485olj$[e-mail]> <[e-mail]>
NNTP-Posting-Host: grail716.nando.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: quoted-printable
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)
To: [e-mail]
Xref: news.epix.net rec.radio.swap:51024 rec.radio.shortwave:66101 rec.radio.scanner:40731 rec.radio.amateur.space:5751 rec.radio.amateur.policy:31871 rec.radio.amateur.misc:94346 rec.radio.amateur.homebrew:11586 rec.radio.amateur.equipment:21443 rec.radio.amateur.digital.misc:12639 rec.radio.amateur.antenna:17124

[e-mail] wrote:
>
>In Article<485olj$[e-mail]>, <[e-mail]> write:
>> Path: castle.nando.net!news
>> From: Dave Hockaday <[e-mail]>
>> Newsgroups: rec.radio.swap,rec.radio.shortwave,rec.radio.scanner,rec.radio.amateur.space,rec.radio.amateur.policy,rec.radio.amate=
ur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.digital.misc,rec.radio.amateur.antenna
>> Subject: Re: Rules of ham DUMB.
>> Date: 12 Nov 1995 21:24:03 GMT
>> Organization: News & Observer Public Access
>> Lines: 12
>> Message-ID: <485olj$[e-mail]>
>> References: <NEWTNews.816104817.1257.amsoft@486dx4_120> <4835cg$[e-mail]> <483p6s$[e-mail]>
>> NNTP-Posting-Host: grail512.nando.net
>> Mime-Version: 1.0
>> Content-Type: text/plain; charset=us-ascii
>> Content-Transfer-Encoding: 7bit
>> X-Mailer: Mozilla 1.22 (Windows; I; 16bit)
>> To: [e-mail]
>> Xref: castle.nando.net rec.radio.swap:47712 rec.radio.shortwave:61743 rec.radio.scanner:27055 rec.radio.amateur.space:5081 rec.ra=
dio.amateur.policy:29534 rec.radio.amateur.misc:88528 rec.radio.amateur.homebrew:10278 rec.radio.amateur.equipment:18962 rec.radio.a=
mateur.digital.misc:10944 rec.radio
>amateur.antenna:15344
>>
>> >>7.  What does a ham consider a seven course meal?
>> >>     A hot dog and a six pack of beer.
>> >
>> >What kinda beer?  Can or bottle?
>>
>> That is a question that deserves some serious consideration. I thought it
>> sounded like the perfect meal (I would require 2 hotdogs, though). Throw
>> in some chips and you're living good :-)
>>
>> Dave WB4IUY
>>
>So Dave, What do you do on the weekends???
>Chris KC4YLE

Partake of perfect meals, for one :-)...
WB4IUY



From Unknown Thu Nov 16 05:45:23 1995
Path: news.epix.net!news.sprintlink.net!news1.sunbelt.net!usenet
From: [e-mail] (Steve Breland)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.cb,rec.radio.noncomm,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap
Subject: re: spamming the net - was Re: The idiot ham trade.
Date: Mon, 13 Nov 1995 23:03:53 GMT
Organization: Richland Memorial Hospital
Lines: 14
Message-ID: <488fb2$[e-mail]>
References: <[e-mail]> <47uhb8$[e-mail]> <481qu5$[e-mail]> <4825eh$[e-mail]>
NNTP-Posting-Host: seb.rmh.edu
X-Newsreader: Forte Agent .99a.107
Xref: news.epix.net rec.radio.amateur.antenna:17104 rec.radio.amateur.digital.misc:12616 rec.radio.amateur.equipment:21412 rec.radio.amateur.homebrew:11563 rec.radio.amateur.misc:94287 rec.radio.amateur.policy:31850 rec.radio.amateur.space:5741 rec.radio.cb:24435 rec.radio.noncomm:4973 rec.radio.scanner:40682 rec.radio.shortwave:66053 rec.radio.swap:50960

Burt Fisher <[e-mail]> wrote:

>I said: "I have a VIC 20 I want to trade for a IC-781" (how long do we
>have read thesre messages where some ham wants to trade his junk for
>something woth something).
>
Burt,
How's about trimming the non-radio groups from your posting
Newsgroups?
Thanks,

-Steve
email: [e-mail]



From Unknown Thu Nov 16 05:45:25 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!news.msfc.nasa.gov!elroy.jpl.nasa.gov!sdd.hp.com!col.hp.com!news.dtc.hp.com!hpscit.sc.hp.com!rkarlqu
From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Spec Analyzer + Noise Gen = Tracking Generator?
Date: 13 Nov 1995 18:07:17 GMT
Organization: Hewlett-Packard
Lines: 28
Message-ID: <4881gl$[e-mail]>
References: <[e-mail]> <4804kd$[e-mail]>
NNTP-Posting-Host: hpscrj.scd.hp.com

In article <4804kd$[e-mail]>, Jim Weir <[e-mail]> wrote:
>[e-mail] (John Ackermann) wrote:
>
>>Sorry if this is a bit long, but in addition to posing a question this might
>>be useful info for other folks.
>
>>If you can't have a network analyzer for tuning cavities, the next best thing
>>is a spectrum analyzer with a tracking generator.  Of course, such things
>>aren't cheap.
>
>>I'd always wondered if a noise generator could serve
>[snip in consideration of bandwidth]
>
>Hey, now THAT's a clever idea.  But I've never seen a noise generator
>that would put out enough poop to be seen on a spectrum analyzer with
>any decent dynamic range left.  How much poo did the noise generator

Someone had mentioned that this technique didn't work with notch
filters.  The reason it doesn't is that the wideband noise overloads
the mixer in the spectrum analyzer and fills in the notch.   If your
spectrum analyzer has a really good dynamic range, you might be
able to adjust the attenuator just right and get away with it, if you
don't need to see down more than 40 dB or so.  Otherwise, use a wider
bandpass filter as a "roughing" filter in cascade with the notch filter
to avoid overload.

Rick Karlquist N6RK
[e-mail]


From Unknown Thu Nov 16 05:45:26 1995
Path: news.epix.net!news.sprintlink.net!news.itsnet.com!usenet
From: Allen Wallace <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Spec Analyzer + Noise Gen = Tracking Generator?
Date: 14 Nov 1995 19:05:11 GMT
Organization: Digital Technology International
Lines: 36
Distribution: world
Message-ID: <48ap97$[e-mail]>
References: <481a8h$[e-mail]>
NNTP-Posting-Host: gatekeeper0.wia.net
X-UserAgent: Version 1.1.3
X-XXDate: Tue, 14 Nov 95 18:45:38 GMT

In article <481a8h$[e-mail]> Mike Keitz, [e-mail]
writes:
>"white" too.  I don't remember exactly but I think a power meter
connected
>to the output measured somewhere in the 100 mW range (be sure your
spectrum
>analyzer is OK for that much input when you're checking the wideband
noise
>without the filter in line).

I would very like like to contruct a noise generator for my spectrum
analyzer. However, I have several problems:

1.  my spectrum analyzer has a noise floor of about -80dbm. I presume
that I can insert a preamp to makeup for a weaker noise source?

2. I can generate noise with with a noise diode, or with a 1N23 diode. I
don't understand ENR (Excess Noise Ratio) and how to predict how much
power will fall into a given bandwidth. I read the QST artical last year,
and I didn't understand it.

3. If I start with a Noise Com NC302 noise diode ( ENR is about 30) and
amplify it with multiple MAR-3 MMIC devices, how many MMIC devices can I
cascade before the +10 dbm compression occurs ? What happens if I exceed
the compression point? Also, keep in mind question #1.

4. My spectrum analyzer has an IF of 2050 MHz. Any signal at that
frequency overrides all other displayed frequencies. I need a sharp band
reject filter! Since I belive that this might be  impractical, I'd settle
for a low pass filter. It would be nice that it be have a flat response
just until about 2 GHz, and then roll off sharply. However, I's again
settle for a filter which was flat until 1300 Mhz and then roll off -80
db at 2000 Mhz.

Thanks,
Allen Wallace    N7CGH


From Unknown Thu Nov 16 05:45:27 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!ncrgw2.ncr.com!ncrhub6!daynews!ranger!cn2935.DaytonOH.attgis.COM!john.ackermann
From: [e-mail] (John Ackermann)
Subject: Re: Spec Analyzer + Noise Gen = Tracking Generator?
X-Nntp-Posting-Host: cn2935.daytonoh.attgis.com
Message-ID: <[e-mail]>
Lines: 32
Sender: [e-mail] (News Administrative Login)
Organization: AT&T Global Information Solutions
X-Newsreader: Trumpet for Windows [Version 1.0 Rev Final Beta #7]
References: <[e-mail]> <4804kd$[e-mail]> <4881gl$[e-mail]>
Date: Tue, 14 Nov 1995 15:43:38 GMT

In article <4881gl$[e-mail]> [e-mail] (Richard Karlquist) writes:

>In article <4804kd$[e-mail]>, Jim Weir <[e-mail]> wrote:
>>>I'd always wondered if a noise generator could serve
>>[snip in consideration of bandwidth]
>>
>>Hey, now THAT's a clever idea.  But I've never seen a noise generator
>>that would put out enough poop to be seen on a spectrum analyzer with
>>any decent dynamic range left.  How much poo did the noise generator

I missed Jim's post, but here's a chance to answer his question.  The noise
generator I got from Advantage seems to have <plenty> of output... I can very
easily run it off the top of the screen with a "normal" gain setting on the
analyzer (unfortunately, my analyzer doesn't have absolute amplitude
calibration, so no accurate output level reading :-( ).

>Someone had mentioned that this technique didn't work with notch
>filters.  The reason it doesn't is that the wideband noise overloads
>the mixer in the spectrum analyzer and fills in the notch.   If your
>spectrum analyzer has a really good dynamic range, you might be
>able to adjust the attenuator just right and get away with it, if you
>don't need to see down more than 40 dB or so.  Otherwise, use a wider
>bandpass filter as a "roughing" filter in cascade with the notch filter
>to avoid overload.

Rick, thanks for that idea.  I'll try a bandpass filter as you suggested; I've
had no luck seeing notches with any other technique I've tried.

73,
John  AG9V
[e-mail]



From Unknown Thu Nov 16 05:45:28 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!simtel!col.hp.com!news.dtc.hp.com!hplextra!hplb!hpwin055.uksr!hpqmoea!dstock
From: [e-mail] (David Stockton)
Subject: Re: Spec Analyzer + Noise Gen = Tracking Generator?
Sender: [e-mail] (SQF News Admin)
Message-ID: <[e-mail]>
Date: Wed, 15 Nov 1995 15:18:27 GMT
References: <4881gl$[e-mail]>
Nntp-Posting-Host: hpqmocc.sqf.hp.com
Organization: Hewlett-Packard LTD, South Queensferry, Scotland
X-Newsreader: TIN [version 1.1 PL8.8]
Lines: 42

Richard Karlquist ([e-mail]) wrote:


: Someone had mentioned that this technique didn't work with notch
: filters.  The reason it doesn't is that the wideband noise overloads
: the mixer in the spectrum analyzer and fills in the notch.   If your
: spectrum analyzer has a really good dynamic range, you might be
: able to adjust the attenuator just right and get away with it, if you
: don't need to see down more than 40 dB or so.  Otherwise, use a wider
: bandpass filter as a "roughing" filter in cascade with the notch filter
: to avoid overload.


    Yes, you get bitten badly in the dynamic range department when trying
to use broadband noise as a stimulus.

    The bandwidth of your noise source, or thing under test (whichever is
narrower) sets the total power hitting the first mixer of the analyser.
This, as Rick says, is why notch filters are a problem. All you can do is
crank in some front-end attenuation. To see the shape of your filter
under test, you have to use a narrow enough IF filter setting to be able
to resolve the skirt of the filter under test (and this is usually worse
still for notch filters...) The net result is that your analyser has to
be set up in a way that is very unfavourable for percieved noise floor,
so you don't get to see very far down the slope of your filter before you
hit analyser limitations. Take some of the RF attenuation out and you get
mixer overload spreading noise around, filling up the stop band again.

    The EMC tests in Europe require spectrum analysers to be able to
correctly measure a test signal designed to resemble the broadband stuff
from an arcing contact. The standard test source is a capacitor
discharged by a vibrating relay contact, the PRF is about 1 kHz, the
noise is a 1kHz comb pretty flat to 1 GHz and the pulse amplitude can be
adjusted up to several tens of volts.  Think of connecting a mini spark
transmitter to your pride and joy receiver...  The result is a devilish
specification that is properly justified by real-world interference
measurements, but forces the use of a tracking preselector in order for
the necessary measurement dynamic range to be met with 120kHz and 9 kHz
resolution bandwidths. This is simply the same problem...

   Cheers
           David  GM4ZNX


From Unknown Thu Nov 16 05:45:29 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Steel Pony )
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.cb,rec.radio.noncomm,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap
Subject: Still Need Sinadder info/manual
Date: 12 Nov 1995 22:48:11 GMT
Organization: Netcom
Lines: 10
Message-ID: <485tjb$[e-mail]>
References: <[e-mail]> <47uhb8$[e-mail]> <481qu5$[e-mail]> <4825d3$[e-mail]> <30a6439c.3935195@165.113.1.21>
NNTP-Posting-Host: ix-ont6-01.ix.netcom.com
X-NETCOM-Date: Sun Nov 12  2:48:11 PM PST 1995
Xref: news.epix.net rec.radio.amateur.antenna:17071 rec.radio.amateur.digital.misc:12589 rec.radio.amateur.equipment:21373 rec.radio.amateur.homebrew:11538 rec.radio.amateur.misc:94224 rec.radio.amateur.policy:31821 rec.radio.amateur.space:5709 rec.radio.cb:24399 rec.radio.noncomm:4964 rec.radio.scanner:40633 rec.radio.shortwave:65986 rec.radio.swap:50886

 Hi fellow hams:

 Still looking for info on Sinadder Model #S-101. Also willing to trade
 a goodie from the qrp junque box for good data. OR willing to pay cos-
 ts for repro's.


 Tnx,

 John, N5INZ


From Unknown Thu Nov 16 05:45:30 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!btnet!dispatch.news.demon.net!demon!mail2news.demon.co.uk!xferret.demon.co.uk
From: Sara Roberts <[e-mail]>
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.cb,rec.radio.scanner,uk.radio.amateur
Subject: Supplier of handheld boxes and aerials?
Followup-To: poster
Date: Sat, 11 Nov 95 06:40:03 GMT
Organization: xferret Internet Services
Lines: 13
Message-ID: <[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: xferret.demon.co.uk
X-Newsreader: Demon Internet Simple News v1.29
Xref: news.epix.net rec.radio.amateur.misc:94202 rec.radio.amateur.homebrew:11531 rec.radio.cb:24394 rec.radio.scanner:40615 uk.radio.amateur:9092

I was wondering if any company supplies handheld radio style enclosures
and aerials?

Cheers,

Sara.

--
  ._o
 / //\.  Sara Roberts
  \>> |  [e-mail]
   \\


From Unknown Thu Nov 16 05:45:31 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!uwm.edu!fnnews.fnal.gov!unixhub!news.Stanford.EDU!newshub.internex.net!viper.inow.com!du17
From: [e-mail] (Kevin W Herron)
Newsgroups: rec.radio.amateur.homebrew
Subject: TAPR mods for PK232MBX
Date: Sat, 11 Nov 95 16:30:28 GMT
Organization: NSI/INOW
Lines: 3
Message-ID: <482j34$[e-mail]>
NNTP-Posting-Host: du17.inow.com
X-Newsreader: News Xpress Version 1.0 Beta #4

Has anyone reading ever completed any of the TAPR mods to the AEA PK232MBX?

73 de KB2NSX


From Unknown Thu Nov 16 05:45:32 1995
Path: news.epix.net!news.sprintlink.net!news.clark.net!starport!brian.carling
Distribution: world
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Brian Carling)
References: <4835e9$[e-mail]>
Date: Sun, 12 Nov 1995 08:15:00 -0500
Organization: =ACE= ONLINE [phone]
Subject: THE biggest THE ham THE p
Message-ID: <[e-mail]>
Lines: 20

From: [e-mail]

Bert - this crap is off-topic for rec.radio.amateur.homebrew
Please take it elsewhere!

BF>      Frequently I hear hams say, THE name HERE is______.
BF>How often do you say when you meet someone (assuming your name
BF>is Charlie), THE name HERE is Charlie? You never do that right? After
BF>to do so is so impersonal and asinine that you would not want
BF>to seem like a fool-then why do it on the air? Just because you
BF>are a ham is no excuse not to be personal. Of course you could
BF>really sound like THE jerk of the year by saying, THE first
BF>personal here is Charlie (at least if you are not personal-you are
BF>using the word-albeit it in an extremely impersonal way).
BF>Also why say "here", is your name any different when you are "there?"

Who really gives a *&#@?
---
 ■ SLMR 2.1a ■ Is your computer too FAST? Type 'WIN' at the DOS prompt!



From Unknown Thu Nov 16 05:45:33 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!alterdial.uu.net!not-for-mail
From: Burt Fisher <[e-mail]>
Newsgroups: rec.radio.swap,rec.radio.shortwave,rec.radio.scanner,rec.radio.amateur.space,rec.radio.amateur.policy,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.digital.misc,rec.radio.amateur.antenna
Subject: THE biggest THE ham THE problem.
Date: 11 Nov 1995 21:43:37 GMT
Lines: 25
Message-ID: <4835e9$[e-mail]>
References: <NEWTNews.816104817.1257.amsoft@486dx4_120>
NNTP-Posting-Host: 199.172.47.193
Mime-Version: 1.0
Content-Type: multipart/mixed;
        boundary="-------------------------------46492684123405"
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)
Xref: news.epix.net rec.radio.swap:50794 rec.radio.shortwave:65921 rec.radio.scanner:40587 rec.radio.amateur.space:5686 rec.radio.amateur.policy:31796 rec.radio.amateur.misc:94175 rec.radio.amateur.homebrew:11519 rec.radio.amateur.equipment:21337 rec.radio.amateur.digital.misc:12566 rec.radio.amateur.antenna:17040

This is a multi-part message in MIME format.

---------------------------------46492684123405
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; charset=us-ascii

From K1OIK:

---------------------------------46492684123405
Content-Transfer-Encoding: 7bit
Content-Type: text/plain

      Frequently I hear hams say, THE name HERE is______.
How often do you say when you meet someone (assuming your name
is Charlie), THE name HERE is Charlie? You never do that right? After
to do so is so impersonal and asinine that you would not want
to seem like a fool-then why do it on the air? Just because you
are a ham is no excuse not to be personal. Of course you could
really sound like THE jerk of the year by saying, THE first
personal here is Charlie (at least if you are not personal-you are
using the word-albeit it in an extremely impersonal way).
Also why say "here", is your name any different when you are "there?"

73 from we here (not there) at K1OIK where THE name are Burt.
---------------------------------46492684123405--


From Unknown Thu Nov 16 05:45:34 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (InterSource )
Newsgroups: rec.puzzles,rec.puzzles.crosswords,rec.pyrotechnics,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.cb,rec.radio.noncomm,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap,rec.roller-coaster,rec.running,rec.scouting,rec.scuba,rec.skiing.alpine
Subject: Re: The idiot ham trade.
Date: 12 Nov 1995 20:41:17 GMT
Organization: Netcom
Lines: 46
Message-ID: <485m5d$[e-mail]>
References: <[e-mail]> <47uhb8$[e-mail]> <481qu5$[e-mail]> <4825eh$[e-mail]>
NNTP-Posting-Host: ix-lv6-01.ix.netcom.com
X-NETCOM-Date: Sun Nov 12 12:41:17 PM PST 1995
Xref: news.epix.net rec.puzzles:52044 rec.puzzles.crosswords:4592 rec.pyrotechnics:37623 rec.radio.amateur.antenna:17070 rec.radio.amateur.digital.misc:12588 rec.radio.amateur.equipment:21370 rec.radio.amateur.homebrew:11537 rec.radio.amateur.misc:94221 rec.radio.amateur.policy:31820 rec.radio.amateur.space:5707 rec.radio.cb:24398 rec.radio.noncomm:4963 rec.radio.scanner:40631 rec.radio.shortwave:65983 rec.radio.swap:50879 rec.roller-coaster:23176 rec.running:45204 rec.scouting:37605 rec.scuba:80205 rec.skiing.alpine:32815

In <4825eh$[e-mail]> Burt Fisher <[e-mail]> writes:

>
>I said: "I have a VIC 20 I want to trade for a IC-781" (how long do we
>have read thesre messages where some ham wants to trade his junk for
>something woth something).
>
>
>From: KH2KQ@KA6EYH.#NOCAL.CA.USA.NOAM
>To  : [e-mail]


Burt there is a Salvation Army Thrift Store in Thornton Colorado (on
Washington Blvd.) that as of last week, had a box with 4 Vic 20's for
sale for $10 --- is that a hint ???? --- surely you were not serious
about that type of trade or was it a typo.>

>Hello Burt,
>
>You actually got one of those VIC-20's you wanna trade?
>
>I do not have a Icom 781, but I does have a Kenwood 950SDX - howsa
bout dat?
>
>Only problem is dat it am attached under the counter of a 36 foot
>motorhome. So if youse trade for da 950 youse gotta take the motorhome
>too. Its got a generator and only 123 actual miles. But the problem
der
>is dat it am havin a dead battery and it can't start and it is in the
>driveway of my vacation home at the beach in Malibu - so youse also
>gotta take the house in Malibu if youse want the 950SDX.
>
>Howsomever, there is a beach bunny and her girlfriend that said they
>would just die if I sold the Malibu house on the beach, so they come
>with the house and the motorhome and the radio.
>
>If dat am OK, then weese got a deal!
>
>Oh yeah, does the VIC-20 got a DC power supply with it?
>
>By the by, if you hear of anyone who has a Kenwood TS-50 attached to a
>Mercedes 450SLC - I would like to trade a Radio Shack 202 for
it!!!!!!!
>
>73 de Chuck



From Unknown Thu Nov 16 05:45:35 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!globe.indirect.com!grizzarv
From: [e-mail] (Robert V. Grizzard)
Newsgroups: rec.puzzles,rec.puzzles.crosswords,rec.pyrotechnics,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.cb,rec.radio.noncomm,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap,rec.roller-coaster,rec.running,rec.scouting,rec.scuba,rec.skiing.alpine
Subject: Re: The idiot ham trade.
Followup-To: rec.puzzles,rec.puzzles.crosswords,rec.pyrotechnics,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.cb,rec.radio.noncomm,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap,rec.roller-coaster,rec.running,rec.scouting,rec.scuba,rec.skiing.alpine
Date: 12 Nov 1995 21:49:34 GMT
Organization: Internet Direct, Inc.
Lines: 9
Message-ID: <485q5e$[e-mail]>
References: <[e-mail]> <47uhb8$[e-mail]> <481qu5$[e-mail]> <4825eh$[e-mail]> <485m5d$[e-mail]>
NNTP-Posting-Host: bud.indirect.com
X-Newsreader: TIN [version 1.2 PL2]
Xref: news.epix.net rec.puzzles:52049 rec.puzzles.crosswords:4594 rec.pyrotechnics:37629 rec.radio.amateur.antenna:17074 rec.radio.amateur.digital.misc:12595 rec.radio.amateur.equipment:21378 rec.radio.amateur.homebrew:11542 rec.radio.amateur.misc:94247 rec.radio.amateur.policy:31834 rec.radio.amateur.space:5715 rec.radio.cb:24402 rec.radio.noncomm:4965 rec.radio.scanner:40638 rec.radio.shortwave:66004 rec.radio.swap:50912 rec.roller-coaster:23179 rec.running:45220 rec.scouting:37611 rec.scuba:80218 rec.skiing.alpine:32831

InterSource ([e-mail]) wrote:
: In <4825eh$[e-mail]> Burt Fisher <[e-mail]> writes:
: >From: KH2KQ@KA6EYH.#NOCAL.CA.USA.NOAM
: >To  : [e-mail]
[chomp]

Folks, can we trim those followup-to lines?  This has nothing to do with
pyrotechnics or rocketry.  Or puzzles.  Or skiing.  Or - but you *do*
have the idea, right?


From Unknown Thu Nov 16 05:45:36 1995
Path: news.epix.net!news.sprintlink.net!EU.net!Germany.EU.net!wizard.pn.com!ci-pioneer!panda!org!org!*domain!*site!*user!intersource!intersource
From: Intersource@Intersource@*user@*site.*domain.org.org (Intersource)
Date: 12 Nov 95 15:41:00
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: The idiot ham trade.
Message-ID: <[e-mail]>
Organization: Fidonet: PandA's Den BBS Usenet: SATINS/Net330 uucp gateway * PandA's Den BBS *Ne
Lines: 56


From: [e-mail] (InterSource )
Subject: Re: The idiot ham trade.
Organization: Netcom

In <4825eh$[e-mail]> Burt Fisher <[e-mail]> writes:

>
>I said: "I have a VIC 20 I want to trade for a IC-781" (how long do we
>have read thesre messages where some ham wants to trade his junk for
>something woth something).
>
>
>From: KH2KQ@KA6EYH.#NOCAL.CA.USA.NOAM
>To  : [e-mail]


Burt there is a Salvation Army Thrift Store in Thornton Colorado (on
Washington Blvd.) that as of last week, had a box with 4 Vic 20's for
sale for $10 --- is that a hint ???? --- surely you were not serious
about that type of trade or was it a typo.>

>Hello Burt,
>
>You actually got one of those VIC-20's you wanna trade?
>
>I do not have a Icom 781, but I does have a Kenwood 950SDX - howsa
bout dat?
>
>Only problem is dat it am attached under the counter of a 36 foot
>motorhome. So if youse trade for da 950 youse gotta take the motorhome
>too. Its got a generator and only 123 actual miles. But the problem
der
>is dat it am havin a dead battery and it can't start and it is in the
>driveway of my vacation home at the beach in Malibu - so youse also
>gotta take the house in Malibu if youse want the 950SDX.
>
>Howsomever, there is a beach bunny and her girlfriend that said they
>would just die if I sold the Malibu house on the beach, so they come
>with the house and the motorhome and the radio.
>
>If dat am OK, then weese got a deal!
>
>Oh yeah, does the VIC-20 got a DC power supply with it?
>
>By the by, if you hear of anyone who has a Kenwood TS-50 attached to a
>Mercedes 450SLC - I would like to trade a Radio Shack 202 for
it!!!!!!!
>
>73 de Chuck

--
|Fidonet:  Intersource 1:330/317
|Internet: Intersource@Intersource@*user@*site.*domain.org.org
| Standard disclaimer: The views of this user are strictly their own.
| PandA's Den BBS FidoNet < > internet gateway - email [e-mail]


From Unknown Thu Nov 16 05:45:37 1995
Path: news.epix.net!news.sprintlink.net!news.dx.net!fangz.com!whirlwind
From: [e-mail] ()
Newsgroups: rec.puzzles,rec.puzzles.crosswords,rec.pyrotechnics,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.cb,rec.radio.noncomm,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap,rec.running,rec.scouting,rec.scuba,rec.skiing.alpine
Subject: Re: The idiot ham trade.
Followup-To: rec.puzzles,rec.puzzles.crosswords,rec.pyrotechnics,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.cb,rec.radio.noncomm,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap,rec.running,rec.scouting,rec.scuba,rec.skiing.alpine
Date: 13 Nov 1995 17:23:23 GMT
Organization: The DataXchange Network, Inc
Lines: 11
Message-ID: <487uub$[e-mail]>
References: <[e-mail]> <47uhb8$[e-mail]> <481qu5$[e-mail]> <4825eh$[e-mail]> <485m5d$[e-mail]>
NNTP-Posting-Host: fangz.com
X-Newsreader: TIN [version 1.2 PL2]
Xref: news.epix.net rec.puzzles:52066 rec.puzzles.crosswords:4601 rec.pyrotechnics:37651 rec.radio.amateur.antenna:17093 rec.radio.amateur.digital.misc:12610 rec.radio.amateur.equipment:21397 rec.radio.amateur.homebrew:11553 rec.radio.amateur.misc:94274 rec.radio.amateur.policy:31843 rec.radio.amateur.space:5734 rec.radio.cb:24429 rec.radio.noncomm:4968 rec.radio.scanner:40673 rec.radio.shortwave:66039 rec.radio.swap:50946 rec.running:45249 rec.scouting:37628 rec.scuba:80256 rec.skiing.alpine:32872

Speaking of idiots, this wound up in a very inappropritate newsgroup. I've
taken the liberty of leaving that newsgroup out of further discussion.

--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Barry K. Swank, Jr.                                          Rochester, NY
[e-mail]

Sig under construction!
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~



From Unknown Thu Nov 16 05:45:38 1995
Path: news.epix.net!news.sprintlink.net!i-2000.com!usenet
From: [e-mail] (Doug Randall)
Newsgroups: rec.puzzles,rec.puzzles.crosswords,rec.pyrotechnics,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.cb,rec.radio.noncomm,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap,rec.roller-coaster,rec.running,rec.scouting,rec.scuba,rec.skiing.alpine
Subject: Re: The idiot ham trade.
Date: Mon, 13 Nov 1995 22:08:45 GMT
Organization: I-2000 Inc. - Internet Services
Lines: 23
Message-ID: <488ff6$[e-mail]>
References: <[e-mail]> <47uhb8$[e-mail]> <481qu5$[e-mail]> <4825eh$[e-mail]>
NNTP-Posting-Host: dougrand.dh.i-2000.com
X-Newsreader: Forte Free Agent 1.0.82
Xref: news.epix.net rec.puzzles:52072 rec.puzzles.crosswords:4603 rec.pyrotechnics:37654 rec.radio.amateur.antenna:17096 rec.radio.amateur.digital.misc:12613 rec.radio.amateur.equipment:21406 rec.radio.amateur.homebrew:11557 rec.radio.amateur.misc:94279 rec.radio.amateur.policy:31845 rec.radio.amateur.space:5737 rec.radio.cb:24433 rec.radio.noncomm:4971 rec.radio.scanner:40679 rec.radio.shortwave:66045 rec.radio.swap:50955 rec.roller-coaster:23191 rec.running:45259 rec.scouting:37635 rec.scuba:80267 rec.skiing.alpine:32879

Burt Fisher <[e-mail]> wrote:

>I said: "I have a VIC 20 I want to trade for a IC-781" (how long do we


>Howsomever, there is a beach bunny and her girlfriend that said they
>would just die if I sold the Malibu house on the beach, so they come
>with the house and the motorhome and the radio.

>By the by, if you hear of anyone who has a Kenwood TS-50 attached to a
>Mercedes 450SLC - I would like to trade a Radio Shack 202 for it!!!!!!!
>
>73 de Chuck
Hello Chuck,

I gotta Mercedes 350SL and it comes with a Alinco DR600.  Been
thinking that I might want to trade for those two beach bunnies if you
don't want them any more...

73's Doug

KN2Y



From Unknown Thu Nov 16 05:45:39 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!mr.net!news.mr.net!mixer.visi.com!usenet
From: [e-mail] ([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.policy,rec.radio.amateur.space,rec.radio.cb,rec.radio.noncomm,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap
Subject: Re: The idiot ham trade.
Date: Mon, 13 Nov 1995 20:42:37 GMT
Organization: Vector Internet Services
Lines: 12
Message-ID: <488apa$[e-mail]>
References: <[e-mail]> <47uhb8$[e-mail]> <481qu5$[e-mail]> <4825eh$[e-mail]> <485m5d$[e-mail]> <487uub$[e-mail]>
NNTP-Posting-Host: stevesam.visi.com
X-Newsreader: Forte Free Agent 1.0.82
Xref: news.epix.net rec.radio.amateur.antenna:17103 rec.radio.amateur.digital.misc:12615 rec.radio.amateur.equipment:21411 rec.radio.amateur.homebrew:11562 rec.radio.amateur.misc:94284 rec.radio.amateur.policy:31849 rec.radio.amateur.space:5740 rec.radio.cb:24434 rec.radio.noncomm:4972 rec.radio.scanner:40681 rec.radio.shortwave:66052 rec.radio.swap:50959

[e-mail] () wrote:

>Speaking of idiots, this wound up in a very inappropritate newsgroup. I've
>taken the liberty of leaving that newsgroup out of further discussion.

<sig cut>
<inappropriate groups cut>

Why not use your judgement and remove ALL inappropriate groups like I
did?
Me



From Unknown Thu Nov 16 05:45:40 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!mr.net!news.mr.net!mixer.visi.com!usenet
From: [e-mail] ([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.policy,rec.radio.amateur.space,rec.radio.cb,rec.radio.noncomm,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap
Subject: Re: The idiot ham trade.
Date: Tue, 14 Nov 1995 17:22:05 GMT
Organization: Vector Internet Services
Lines: 11
Message-ID: <48ajd5$[e-mail]>
References: <[e-mail]> <47uhb8$[e-mail]> <481qu5$[e-mail]> <4825eh$[e-mail]> <488ff6$[e-mail]> <[e-mail]>
NNTP-Posting-Host: stevesam.visi.com
X-Newsreader: Forte Free Agent 1.0.82
Xref: news.epix.net rec.radio.amateur.antenna:17113 rec.radio.amateur.digital.misc:12625 rec.radio.amateur.equipment:21423 rec.radio.amateur.homebrew:11569 rec.radio.amateur.misc:94303 rec.radio.amateur.policy:31855 rec.radio.amateur.space:5745 rec.radio.cb:24439 rec.radio.noncomm:4977 rec.radio.scanner:40696 rec.radio.shortwave:66065 rec.radio.swap:50970

[e-mail] (CrazyOne - Greg Pacek) wrote:

>In article <488ff6$[e-mail]>, [e-mail] (Doug Randall) wrote:

<snip>
<inappropriate groups cut>

PLEASE check your subject lines people!
REC.PYROTECHNICS DOESN'T CARE!
Me



From Unknown Thu Nov 16 05:45:41 1995
Path: news.epix.net!news.sprintlink.net!gatech2!usenet.eel.ufl.edu!freenet3.freenet.ufl.edu!afn17891
From: "Thomas W. Castle" <[e-mail]>
Newsgroups: rec.puzzles,rec.puzzles.crosswords,rec.pyrotechnics,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.rad
Subject: Re: The test.
Date: Sun, 12 Nov 1995 23:44:05 -0500
Lines: 17
Message-ID: <[e-mail]>
References: <[e-mail]> <47uhb8$[e-mail]> <[e-mail]> <482526$[e-mail]>
NNTP-Posting-Host: freenet3.afn.org
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
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Xref: news.epix.net rec.puzzles:52054 rec.puzzles.crosswords:4596 rec.pyrotechnics:37635 rec.radio.amateur.antenna:17084 rec.radio.amateur.digital.misc:12602 rec.radio.amateur.equipment:21387 rec.radio.amateur.homebrew:11547 rec.radio.amateur.misc:94262 rec.radio.amateur.policy:31839 rec.radio.amateur.space:5726

Gee Burp... I see your going to be a pain in the ass in several
news groups.... I don't know  <or care> if your problem is caused
RF, Magnetic fields or your just a plain foamer & drooler...

Why don't you try some of the other news groups for some help?
//www/ Dr. Kavor.@ death.com, Birth contol retro-active, or one
of the www// sites for "Do it yourself Frontal lobotomy, Electro-
shock therapy or just wait for your new Lithuim tablets to
come in....

If your that bored with life an have nothing better to do than
complain; maybe we can get you on the "Uni-B" X-mas mailing list...

Don't go away mad just go away....

KD4QHH a.k.a. Tom



From Unknown Thu Nov 16 05:45:42 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: What's circulator good for? was Re: How does "circulator" work?
Date: 11 Nov 1995 16:43:47 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 31
Sender: [e-mail]
Message-ID: <4835ej$[e-mail]>
References: <481p4s$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <481p4s$[e-mail]>, [e-mail]
(Mike Groves) writes:

>>                                                           The lot more
>>common application is when you have tranmsitter and reciever using same
>antenna
>>and you want to make sure that transmitted signal going into antenna
only,
>>and recieved signal from antenna  going to reciever only. So, you
connect
>>transmitter to port a, antenna to port b, and reciever to port c, you'll

>>get signal from transmitter (port a) going to port b (antenna) and
nowhere
>>else, and recieved signal from antenna (port b) going to reciever (port
c)
>>and nowhere else. Another application would be when you want to protect
>>transmitter from load mismatch and isoltare reflected signal from
forward
>one.
>>Actually, in all of these examples you can use hybrid as well...

Let me see if I follow this correctly. To build a TR switch, substitute
the receiver input for the dummy load in an isolator system.

Wouldn't an additional side benefit be "The transmitter will always see a
low SWR, because the receiver dissipates all reflected power"?

Interesting concept.

73 Tom


From Unknown Tue Nov 21 19:05:08 1995
Path: news.epix.net!news.sprintlink.net!hookup!gatech2!pirates!cssun.mathcs.emory.edu!swrinde!newsfeed.internetmci.com!news.fibr.net!news1.crl.com!nntp.crl.com!pacbell.com!usenet
From: Dale Goodman <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: TenTec kits
Date: Wed, 15 Nov 1995 17:01:48 -0800 (PST)
Organization: Pacific Bell
Lines: 3
Message-ID: <Pine.SUN.3.90.951115165912.23235A-100000@snowwhite>
NNTP-Posting-Host: snowwhite.bsrn2430.pacbell.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Sender: dxgoodm@snowwhite

Has anyone built or know about the TenTec 2 meter kit. I was told it was
comming back into production this winter. It looks to have a lot more
features than the Ramsey...Any comments? Dale KD4CVR


From Unknown Tue Nov 21 19:05:08 1995
Path: news.epix.net!news.sprintlink.net!news.dpc.net!novia!uunet!in1.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ** HELP with mic preamp
Date: 15 Nov 1995 17:57:46 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 23
Sender: [e-mail]
Message-ID: <48dr9a$[e-mail]>
References: <48b9il$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <48b9il$[e-mail]>, Paul Christensen
<[e-mail]> writes:

>
>This combination of crystal element and FET source follower preamp
>results in an incredibly nice sound for communications audio.
>
>-Paul, N9AZ

I use a D-104 to drive an Icom 751A. It works great, and gets excellent
audio reports. I use a single J-310 FET source follower to do the
impedance matching. It has nearly nearly identical output voltage and
current as the stock hand mic. I think there's a total of five components
in the entire circuit! The gate resistor is a 2.2 meg ohm, the source 470
ohm, the supply 9 volts through an automatic turn-off transistor switch
(battery saver).

Paul hit the nail on the head,  a 100k resistor on the gate is much too
low for good response. After a sprinkle of FB-73-801 beads and a few
bypass caps I can apply RF directly to the micropone case without RF
feedback!

73 Tom


From Unknown Tue Nov 21 19:05:09 1995
Path: news.epix.net!news.sprintlink.net!news.heurikon.com!news.dpc.net!novia!news.inc.net!news.sol.net!spool.mu.edu!howland.reston.ans.net!gatech!europa.chnt.gtegsc.com!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!in1.uu.net!newsfeed.pitt.edu!dsinc!news.enter.net!usenet
From: Ken Florence <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: QSKing a Heath SB1000 (AL80A)
Date: Wed, 15 Nov 1995 22:37:42 -0800
Organization: ENTER.NET
Lines: 8
Message-ID: <[e-mail]>
NNTP-Posting-Host: ppp8.enter.net
Mime-Version: 1.0
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HELP! I'd like to QSK this amp. It is a clone of the ameritron
AL80A. I don't want to spend 200 - 300 bucks for their kit.
Anyone got some plans that can point me in the direction I need
to go. Surely I should be able to do this with a vacum relay and
some parts (right??!!). Thanks.
--
Ken Florence  KA3PLS
[e-mail]


From Unknown Tue Nov 21 19:05:10 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!EU.net!sun4nl!metropolis.nl!ppp0-122
From: [e-mail] (D.A.H. Bezemer)
Subject: SAW filer
X-Nntp-Posting-Host: ppp0-122.metropolis.nl
Message-ID: <[e-mail]>
Sender: [e-mail] (usenet)
Organization: Metropolis Internet
X-Newsreader: News Xpress Version 1.0 Beta #3
Date: Thu, 16 Nov 1995 00:00:32 GMT
Lines: 6

Does anyone know a manufactor or source for an SAW filter with a single
pass-band of about 800 Khz (-3dB). There is no strict centerfreqency needed,
but somewhere between 24 MHz and 48 MHz would be great (36 MHz preferably).

73's Dennis Bezemer, PA3DKT



From Unknown Tue Nov 21 19:05:11 1995
Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!newsfeed.internetmci.com!news.zynet.com!tesuque.cs.sandia.gov!SantaFe!usenet
From: Jim Potter <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NDN: Ham-Homebrew Digest V95 #384
Date: Thu, 16 Nov 1995 00:35:48 -0800
Organization: JP Accelerator Works, Inc.
Lines: 9
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: dial129.roadrunner.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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X-Mailer: Mozilla 2.0b2 (Windows; I; 16bit)
To: [e-mail]

How do I subscribe to the Ham-Homebrew list?

de K9GXC, Jim

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


From Unknown Tue Nov 21 19:05:12 1995
Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!infoseek.com!uunet!in2.uu.net!news3.digex.net!news1.digex.net!news.spaceworks.com!news.spaceworks.com!not-for-mail
From: [e-mail] (bill harris)
Newsgroups: rec.puzzles,rec.puzzles.crosswords,rec.pyrotechnics,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.cb,rec.radio.noncomm,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap,rec.roller-coaster,rec.running,rec.scouting,rec.scuba,rec.skiing.alpine
Subject: Re: What some think about sexy hams
Date: 16 Nov 1995 02:20:46 -0500
Organization: SpaceWorks, Incorporated
Lines: 12
Sender: [e-mail]
Message-ID: <48eooe$[e-mail]>
References: <[e-mail]> <47uhb8$[e-mail]> <481qu5$[e-mail]> <4825g6$[e-mail]> <487hjv$[e-mail]>
NNTP-Posting-Host: mars.spaceworks.com
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Xref: news.epix.net rec.puzzles:52148 rec.puzzles.crosswords:4612 rec.pyrotechnics:37698 rec.radio.amateur.antenna:17155 rec.radio.amateur.digital.misc:12650 rec.radio.amateur.equipment:21467 rec.radio.amateur.homebrew:11610 rec.radio.amateur.misc:94397 rec.radio.amateur.policy:31899 rec.radio.amateur.space:5764 rec.radio.cb:24483 rec.radio.noncomm:4986 rec.radio.scanner:40773 rec.radio.shortwave:66146 rec.radio.swap:51093 rec.roller-coaster:23218 rec.running:45394 rec.scouting:37737 rec.scuba:80472 rec.skiing.alpine:33079

>>I've only been an amateur radio operator for 18 years and I would have to
(snip)
>>Don't let the bad apples spoil the excitement that can be found in amateur
>>radio, there is something there for everyone (wives/girlfriends too).

>Speaking of HAM radios, could this group help me out?  Every time I go and
>dive with my radio set, the fuse blows.  What's the trick here?

Next time you dive make sure there is water in the pool.

Bill - K5MIL



From Unknown Tue Nov 21 19:05:13 1995
Path: news.epix.net!news.sprintlink.net!news.onramp.net!news.tcst.com!dildog.lgc.com!news.sesqui.net!darwin.sura.net!dcc.uchile.cl!library.ucla.edu!info.ucla.edu!newsfeed.internetmci.com!in2.uu.net!elvis.delphi.com!usenet
From: DOUG GAVILANES <[e-mail]>
Newsgroups: soc.culture.venezuela,soc.culture.uruguay,soc.culture.spain,soc.culture.peru,soc.culture.mexican.american,soc.culture.latin-america,soc.culture.ecuador,soc.culture.cuba,soc.culture.colombia,soc.culture.chile,soc.culture.bolivia,soc.culture.argentina,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.digital.misc,rec.radio.amateur.antenna
Subject: Re: RADIOAFICIOANDOS ENLAZADOS VIA INTERNET
Date: 16 Nov 1995 06:54:03 GMT
Organization: Delphi Internet Services
Lines: 14
Message-ID: <48en6b$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: slip134-69.bb.delphi.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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Xref: news.epix.net soc.culture.venezuela:42985 soc.culture.uruguay:4341 soc.culture.spain:81199 soc.culture.peru:10340 soc.culture.mexican.american:7654 soc.culture.latin-america:38844 soc.culture.ecuador:3981 soc.culture.cuba:29776 soc.culture.colombia:11680 soc.culture.chile:30942 soc.culture.bolivia:9959 soc.culture.argentina:26778 rec.radio.amateur.misc:94402 rec.radio.amateur.homebrew:11614 rec.radio.amateur.equipment:21474 rec.radio.amateur.digital.misc:12652 rec.radio.amateur.antenna:17160

Saludos desde la zona W6,
             Que tal si la proxima vez usamos una repetidora de 2M o
440MHz en Los Angeles? El sistema de 1.2 GHz no tiene mucho uso aqui en
Los Angeles. Les felicito por el hecho. Acabo de comprar Internet Phone y
reconozco que hacer la conexion resulta sumamente facil. Voy a averiguar
si hay alguna repetidora mas accesible que quiere participar para otro
enlace. Hasta pronto,

73 cordiales desde Disneylandia,

Douglas Gavilanes Russo, N6XQY
[e-mail]




From Unknown Tue Nov 21 19:05:14 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (--- )
Newsgroups: rec.puzzles,rec.puzzles.crosswords,rec.pyrotechnics,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.cb,rec.radio.noncomm,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap,rec.roller-coaster,rec.running,rec.scouting,rec.scuba,rec.skiing.alpine
Subject: Re: The idiot ham trade.
Date: 16 Nov 1995 09:19:48 GMT
Organization: Netcom
Lines: 1
Message-ID: <48evnk$[e-mail]>
References: <[e-mail]> <47uhb8$[e-mail]> <481qu5$[e-mail]> <4825eh$[e-mail]> <485m5d$[e-mail]>
NNTP-Posting-Host: ix-lv7-15.ix.netcom.com
X-NETCOM-Date: Thu Nov 16  1:19:48 AM PST 1995
Xref: news.epix.net rec.puzzles:52159 rec.puzzles.crosswords:4615 rec.pyrotechnics:37709 rec.radio.amateur.antenna:17168 rec.radio.amateur.digital.misc:12658 rec.radio.amateur.equipment:21489 rec.radio.amateur.homebrew:11619 rec.radio.amateur.misc:94410 rec.radio.amateur.policy:31908 rec.radio.amateur.space:5769 rec.radio.cb:24494 rec.radio.noncomm:4988 rec.radio.scanner:40796 rec.radio.shortwave:66160 rec.radio.swap:51121 rec.roller-coaster:23224 rec.running:45417 rec.scouting:37755 rec.scuba:80499 rec.skiing.alpine:33119




From Unknown Tue Nov 21 19:05:17 1995
Path: news.epix.net!news.sprintlink.net!malgudi.oar.net!catseye.bluemarble.net!usenet.ucs.indiana.edu!vixen.cso.uiuc.edu!sdd.hp.com!gatech2!usenet.eel.ufl.edu!newsfeed.internetmci.com!news.kei.com!simtel!swidir.switch.ch!swsbe6.switch.ch!scsing.switch.ch!news.belwue.de!news.uni-ulm.de!rz.uni-karlsruhe.de!news.uni-stuttgart.de!moritz
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Combining 2 Amplifiers?
Date: 16 Nov 1995 09:37:29 GMT
Organization: Comp.Center (RUS), U of Stuttgart, FRG
Lines: 11
Message-ID: <48f0op$[e-mail]>
References: <[e-mail]> <48ad5d$[e-mail]> <[e-mail]>
NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de

>Well, it's *easier* to combine two identical amps, but you can combine
>similar amps. You just need a line stretcher and a gain leveling pad in
>one input leg to make the output phases and amplitudes balance.

Sure. You just have to provide a swithcable phasing line for every
HF band on which you want to operate. For a all band system I would
call it impractical.

73, Moritz DL5UH




From Unknown Tue Nov 21 19:05:18 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (KA9EGW)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: T-R Switches
Date: 16 Nov 1995 11:28:52 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 6
Sender: [e-mail]
Message-ID: <48fos4$[e-mail]>
References: <48dq2c$[e-mail]>
Reply-To: [e-mail] (KA9EGW)
NNTP-Posting-Host: newsbf02.mail.aol.com

Anything you get, please e-mail a copy to [e-mail], as I'm putting a
Heath Apache on the air w/a R390 and am in a similar predicament.  I'm
researching how it can be done w/PIN diodes if at all and will let you
know what I find.

73, Brian, [e-mail]


From Unknown Tue Nov 21 19:05:19 1995
Newsgroups: rec.radio.swap,rec.radio.shortwave,rec.radio.scanner,rec.radio.amateur.space,rec.radio.amateur.policy,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.digital.misc,rec.radio.amateur.antenna
Path: news.epix.net!news.sprintlink.net!sparky.insinc.net!newsfeed.direct.ca!imci2!newsfeed.internetmci.com!news.kei.com!simtel!col.hp.com!news.dtc.hp.com!hplextra!hplb!hpwin055.uksr!hpqmoea!dstock
From: [e-mail] (David Stockton)
Subject: Re: Burt Fisher jokes not funny
Sender: [e-mail] (SQF News Admin)
Message-ID: <[e-mail]>
Date: Thu, 16 Nov 1995 12:52:13 GMT
References: <4867e4$[e-mail]>
Nntp-Posting-Host: hpqmocc.sqf.hp.com
Organization: Hewlett-Packard LTD, South Queensferry, Scotland
X-Newsreader: TIN [version 1.1 PL8.8]
Followup-To: rec.radio.swap,rec.radio.shortwave,rec.radio.scanner,rec.radio.amateur.space,rec.radio.amateur.policy,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.digital.misc,rec.radio.amateur.antenna
Lines: 15
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Burt Fisher ([e-mail]) wrote:


: Then why do I get frequent messages that appreciate my comments?


    Is this the first contact with non-human sapient entities ?

    Or is someone going to suggest that any message that likes Burt's
humour..........   No,  who would be so cruel ?


     Cheers,
              David



From Unknown Tue Nov 21 19:05:20 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!fred.interval.com!burdick.interval.com!user
From: [e-mail] (wayne burdick)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QRP KEYER CKT???
Date: Thu, 16 Nov 1995 13:49:05 -0800
Organization: interval research
Lines: 33
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: burdick.interval.com

 [e-mail] wrote:

> DOES ANYONE KNOW OF A CHEAP, LOW COST, LOW POWER KEYER THAT CAN BE ADDED
> TO A QRP RIG. I DONT WANT TO USE THE CURTIS CHIP

Hi Barry,

You might consider the Wilderness Radio KC1.   This is a keyer AND
frequency counter on a single small board (0.8" x 2.5").  You can build it
into anything; only draws 4mA.

The keyer has two iambic modes and 50 characters of nonvolatile message
buffering.  All parameters are entered using the keyer paddle, e.g.
weight, QSK delay, messages, etc.

The frequency counter does not use a display.  Instead it reports your
operating frequency as three digits in Morse code (to 1kHz), by sending
audio tones directly to the rig's audio amplifier stage.   You use the
keyer paddle to program an offset, so it will work with rigs having any
mixing scheme.  It's especially nice for rigs that don't have a calibrated
VFO dial.

The KC1 is $44.50 as a full kit with PC board, controls, and all parts,
including a programmed 18-pin microprocessor that does most of the work.
I designed the unit for Wilderness Radio, so if you have any technical
questions let me know.


Wilderness Radio can be contacted at 415-494-3806.  Talk to Bob Dyer, KD6VIO.

73,
Wayne
N6KR


From Unknown Tue Nov 21 19:05:21 1995
Path: news.epix.net!news.sprintlink.net!news.onramp.net!news.mind.net!chi-news.cic.net!io.org!van-bc!news.mindlink.net!agate!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!news.ultranet.com!bigboote.WPI.EDU!news3.near.net!tristram.edc.org!news
From: Kevin Kelleher <kevink>
Newsgroups: rec.puzzles,rec.puzzles.crosswords,rec.pyrotechnics,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.cb,rec.radio.noncomm,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap,rec.running,rec.scouting,rec.scuba,rec.skiing.alpine
Subject: Re: What some think about sexy hams
Date: 16 Nov 1995 14:28:22 GMT
Organization: Education Development Center
Lines: 4
Message-ID: <48fhq6$[e-mail]>
References: <[e-mail]> <47uhb8$[e-mail]> <481qu5$[e-mail]> <4825g6$[e-mail]> <487bgm$[e-mail]>
NNTP-Posting-Host: tristram.edc.org
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X-URL: news:487bgm$[e-mail]
Xref: news.epix.net rec.puzzles:52153 rec.puzzles.crosswords:4614 rec.pyrotechnics:37703 rec.radio.amateur.antenna:17163 rec.radio.amateur.digital.misc:12655 rec.radio.amateur.equipment:21477 rec.radio.amateur.homebrew:11616 rec.radio.amateur.misc:94407 rec.radio.amateur.policy:31904 rec.radio.amateur.space:5768 rec.radio.cb:24491 rec.radio.noncomm:4987 rec.radio.scanner:40791 rec.radio.shortwave:66153 rec.radio.swap:51108 rec.running:45410 rec.scouting:37747 rec.scuba:80487 rec.skiing.alpine:33099

Please add rec.org.mensa.flame.flame.flame to this thread.

And let me say that I love running behind a woman with sexy hams.



From Unknown Tue Nov 21 19:05:22 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!news.ultranet.com!bigboote.WPI.EDU!news3.near.net!tristram.edc.org!news
From: Kevin Kelleher <kevink>
Newsgroups: rec.puzzles,rec.puzzles.crosswords,rec.pyrotechnics,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.cb,rec.radio.noncomm,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap,rec.running,rec.scouting,rec.scuba,rec.skiing.alpine,rec.org.mensa.flame.flame.flame
Subject: Re: What some think about sexy hams
Date: 16 Nov 1995 14:37:17 GMT
Organization: Education Development Center
Lines: 4
Message-ID: <48fiat$[e-mail]>
References: <[e-mail]> <47uhb8$[e-mail]> <481qu5$[e-mail]> <4825g6$[e-mail]> <487bgm$[e-mail]> <48fhq6$[e-mail]>
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X-Mailer: Mozilla 1.1N (X11; I; SunOS 5.4 sun4m)
X-URL: news:48fhq6$[e-mail]
Xref: news.epix.net rec.puzzles:52143 rec.puzzles.crosswords:4610 rec.pyrotechnics:37697 rec.radio.amateur.antenna:17153 rec.radio.amateur.digital.misc:12647 rec.radio.amateur.equipment:21466 rec.radio.amateur.homebrew:11607 rec.radio.amateur.misc:94393 rec.radio.amateur.policy:31896 rec.radio.amateur.space:5762 rec.radio.cb:24481 rec.radio.noncomm:4985 rec.radio.scanner:40768 rec.radio.shortwave:66141 rec.radio.swap:51088 rec.running:45387 rec.scouting:37735 rec.scuba:80465 rec.skiing.alpine:33071

After reading the original "sexy hams" message, I see that the hams in
question where not anatomical, but radio hams.  Sorry.  I just assumed
that in a rec.running, hams were the... well you know.



From Unknown Tue Nov 21 19:05:23 1995
Path: news.epix.net!news.sprintlink.net!hookup!uwm.edu!vixen.cso.uiuc.edu!sdd.hp.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re:Where is QEX?
Date: 16 Nov 95 15:20:30 GMT
Organization: ucsd usenet gateway
Lines: 21
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

I understand that Jon Bloom (the editor) and his wife both work for ARRL in
publications.  They had a baby this summer (their first) and this has
interrupted the schedule for QEX.

I received my September issue Monday.

Honest, Jon and his crew (if there is anyone besides him) are working furiously
to get the magazine back on schedule.  Jon tells me that we will get ALL of the
issues, albeit a little late.  I talked to Zack Lau at Microwave update, so I
know that articles for each of the issues are to Jon.  All Jon needs to do is
get the magazines edited and put together.

My request to y'all is to give Jon until the first of the year at least before
you get too upset.

I thank you and I'm sure Jon appreciates any understanding on this.

Ray Mack
WD5IFS
[e-mail]



From Unknown Tue Nov 21 19:05:24 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsjunkie.ans.net!gatech2!pirates!cssun.mathcs.emory.edu!swrinde!newsfeed.internetmci.com!news1.i1.net!news1.inlink.com!usenet
From: [e-mail] (Gary V. Deutschmann, Sr.)
Newsgroups: rec.puzzles,rec.puzzles.crosswords,rec.pyrotechnics,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.cb,rec.radio.noncomm,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap,rec.roller-coaster,rec.running,rec.scouting,rec.scuba,rec.skiing.alpine
Subject: Re: The idiot ham trade.
Date: Thu, 16 Nov 1995 16:21:07 GMT
Organization: Inlink
Lines: 4
Message-ID: <48fo6h$[e-mail]>
References: <[e-mail]> <47uhb8$[e-mail]> <481qu5$[e-mail]> <4825eh$[e-mail]> <485m5d$[e-mail]> <485q5e$[e-mail]>
NNTP-Posting-Host: slip158.inlink.com
X-Newsreader: Forte Free Agent 1.0.82
Xref: news.epix.net rec.puzzles:52160 rec.puzzles.crosswords:4616 rec.pyrotechnics:37711 rec.radio.amateur.antenna:17169 rec.radio.amateur.digital.misc:12659 rec.radio.amateur.equipment:21494 rec.radio.amateur.homebrew:11620 rec.radio.amateur.misc:94411 rec.radio.amateur.policy:31909 rec.radio.amateur.space:5770 rec.radio.cb:24495 rec.radio.noncomm:4989 rec.radio.scanner:40798 rec.radio.shortwave:66161 rec.radio.swap:51124 rec.roller-coaster:23225 rec.running:45418 rec.scouting:37756 rec.scuba:80500 rec.skiing.alpine:33121

If I fix a HAM & CHEESE on Jewish Rye, is it KOSHER, or must I use
Kosher Pickles to get the effect?




From Unknown Tue Nov 21 19:05:25 1995
Path: news.epix.net!news.sprintlink.net!news.missouri.edu!news
From: Sarah Godfrey <[e-mail].>
Newsgroups: rec.puzzles,rec.puzzles.crosswords,rec.pyrotechnics,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.cb,rec.ra
Subject: Re: What some think about sexy hams
Date: 16 Nov 1995 18:41:55 GMT
Organization: University of Missouri - Columbia
Lines: 3
Message-ID: <48g0lj$[e-mail]>
References: <[e-mail]> <47uhb8$[e-mail]> <481qu5$[e-mail]> <4825g6$[e-mail]> <487hjv$[e-mail]> <48be57$[e-mail]>
NNTP-Posting-Host: mac1.phlab.missouri.edu
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Macintosh; I; PPC)
X-URL: news:48be57$[e-mail]
Xref: news.epix.net rec.puzzles:52152 rec.puzzles.crosswords:4613 rec.pyrotechnics:37702 rec.radio.amateur.antenna:17162 rec.radio.amateur.digital.misc:12654 rec.radio.amateur.equipment:21476 rec.radio.amateur.homebrew:11615 rec.radio.amateur.misc:94405 rec.radio.amateur.policy:31902 rec.radio.amateur.space:5766 rec.radio.cb:24488

What is all this???




From Unknown Tue Nov 21 19:05:26 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!hookup!tank.news.pipex.net!pipex!newsfeed.internetmci.com!nntp-hub2.barrnet.net!pacbell.com!amdahl.com!amd!netcomsv!uu4news.netcom.com!netcomsv!uu3news.netcom.com!ix.netcom.com!netcom.com!n1ist
From: [e-mail] (Michael L. Ardai)
Subject: Re: TenTec kits
Message-ID: <[e-mail]>
Organization: Utopia Planetia Shipyards - Mars
References: <Pine.SUN.3.90.951115165912.23235A-100000@snowwhite>
Date: Thu, 16 Nov 1995 19:46:56 GMT
Lines: 14
Sender: [e-mail]

In article <Pine.SUN.3.90.951115165912.23235A-100000@snowwhite> Dale Goodman <[e-mail]> writes:
-Has anyone built or know about the TenTec 2 meter kit.

I just called them.  The latest best guess is some time around 1 January,
but given past delays and promises, I wouldn't hold my breath for that date.
At last word, the delay was to improve the design so that it could be
built and aligned with minimal test equipment.  At least they care about
not putting lousy signals on the air.

/mike
--
\|/     Michael L. Ardai     N1IST             Teradyne ATB, Boston MA
-*- -------------------------------------------------------------------------
/|\     [e-mail]          [e-mail]


From Unknown Tue Nov 21 19:05:27 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!nntp.crl.com!crl14.crl.com!not-for-mail
From: [e-mail] (Henry B. Smith)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DSP for the R2?
Date: 16 Nov 1995 21:33:51 -0800
Organization: Dallas, TX
Lines: 14
Message-ID: <48h6rv$[e-mail]>
References: <[e-mail]> <[e-mail]> <48dis0$[e-mail]> <[e-mail]>
NNTP-Posting-Host: crl14.crl.com
X-Newsreader: TIN [version 1.2 PL2]

Gary,

Thanks for the info.

Now all I need is some time, an R2 and a VFO or DDS.

BTW, I forgot to ask.  Anybody got a favorite DDS that they have build up?

Thanks,

Smitty, NA5K
--
Henry Smith ([e-mail])



From Unknown Tue Nov 21 19:05:28 1995
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!paladin.american.edu!hookup!swrinde!newsfeed.internetmci.com!globe.indirect.com!grizzarv
From: [e-mail] (Robert V. Grizzard)
Newsgroups: rec.puzzles,rec.puzzles.crosswords,rec.pyrotechnics,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.cb
Subject: Re: What some think about sexy hams
Followup-To: rec.radio.amateur.misc
Date: 17 Nov 1995 01:23:00 GMT
Organization: Internet Direct, Inc.
Lines: 12
Message-ID: <48go5l$[e-mail]>
References: <[e-mail]> <47uhb8$[e-mail]> <481qu5$[e-mail]> <4825g6$[e-mail]> <487hjv$[e-mail]> <48be57$[e-mail]> <48g0lj$[e-mail]>
NNTP-Posting-Host: bud.indirect.com
X-Newsreader: TIN [version 1.2 PL2]
Xref: news.epix.net rec.puzzles:52175 rec.puzzles.crosswords:4618 rec.pyrotechnics:37716 rec.radio.amateur.antenna:17179 rec.radio.amateur.digital.misc:12671 rec.radio.amateur.equipment:21508 rec.radio.amateur.homebrew:11626 rec.radio.amateur.misc:94424 rec.radio.amateur.policy:31918 rec.radio.amateur.space:5772 rec.radio.cb:24502

Sarah Godfrey ([e-mail].) wrote:
: What is all this???


Sarah, this is a thread with a hitherto untrimmed followup-to line.

Since this doesn't fit anywhere else in the known ham radio universe, I'm
going to arbitrarily set the followups to rec.radio.amateur.misc.

I don't know where it started from.

KG7YY (posting from rec.pyrotechnics)


From Unknown Tue Nov 21 19:05:29 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!tcsi.tcs.com!agate!dog.ee.lbl.gov!news.cs.utah.edu!news.cc.utah.edu!cor!not-for-mail
From: [e-mail] (Eugene Watanabe)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.scanner
Subject: Re: Standard 568A recovery?
Followup-To: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.scanner
Date: 17 Nov 1995 02:06:50 GMT
Organization: University of Utah Computer Center
Lines: 22
Message-ID: <48gqnq$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: cor.oz.cc.utah.edu
X-Newsreader: TIN [UNIX 1.3 950515BETA PL0]
Xref: news.epix.net rec.radio.amateur.equipment:21519 rec.radio.amateur.homebrew:11633 rec.radio.scanner:40831

Michael Fogarty ([e-mail]) wrote:
: A new tribander is out from Standard: the 568A.  It receives a surprising
: array of frequencies, including 800-1300MHz.  Does anyone know of mods
: for recovering the interesting parts of the 800 realm?  I've checked
: Oakland and can't get through to AD4HL's BBS (at 615-537-6051).
:
: Does anyone have one of these radios?  What do you think?
:
: I'd also like to get a general feeling for what people think about the
: Standard brand.
:
: In the market,
: Mike
I own the Standard c558a dual band handheld and the c5718 dual band
mobile.  I like them so much that I wouldn't part with them for anything.
(Well, almost anything.)  They are extremely solid rigs and sound great
(on receive and transmit).

73's

Eugene (AA7BH)



From Unknown Tue Nov 21 19:05:30 1995
Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!usenet
From: [e-mail] (Pieter Ibelings)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need source of PC mounted Totshu RF relays.
Date: 17 Nov 1995 13:50:52 GMT
Organization: Scientific Atlanta
Lines: 12
Message-ID: <48i3vs$[e-mail]>
NNTP-Posting-Host: wave.mindspring.com
Mime-Version: 1.0
X-Newsreader: WinVN 0.99.2

I am looking for a source of PC mounted RF relays made by Totshu. If you
have any information please e-mail it to me asap. Thanks for the help.

73's

Pieter Ibelings
AC4OP
HK1ZAB


email:  [e-mail]



From Unknown Tue Nov 21 19:05:31 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!spool.mu.edu!usenet.eel.ufl.edu!gatech2!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: WWV propogation variability
Date: 17 Nov 95 16:41:25 GMT
Organization: ucsd usenet gateway
Lines: 13
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]



     I am looking at a couple things that would use WWV time service.  I
     need to know about variations in prop delay over a short distance and
     moderate time periods.  If two stations are separated by 300 miles or
     so what amount will the prop delay change relative to each other?
     This change is other than the delay due to the differences in distance
     from the transmiter which can be modeled as a constant.  In other
     words, if the signal is used to drive clockx that have a constant
     compensation for the prop delay due to distance what is the worst time
     difference in the two clocks?

     EFBryan


From Unknown Tue Nov 21 19:05:32 1995
Path: news.epix.net!news.sprintlink.net!gatech2!swrinde!newsfeed.internetmci.com!in1.uu.net!news.ultranet.com!mle.ultranet.com!medlas
From: [e-mail] (Ray Fennessey)
Newsgroups: rec.radio.amateur.homebrew
Subject: tubes
Date: Fri, 17 Nov 1995 16:48:36 GMT
Organization: Ultranet Communications, Inc., Marlboro MA USA
Lines: 6
Message-ID: <[e-mail]>
NNTP-Posting-Host: mle.ultranet.com
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4]

I have a quantity of tubes with the following markings: BBC Brown Boveri  T
380-1. What type of tubes are they and what are they commonly used for? Thanks
for your help.

Ray Fennessey  N1QPT
[e-mail]


From Unknown Tue Nov 21 19:05:33 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.texas.net!imci2!newsfeed.internetmci.com!gatech2!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Modem --> TNC
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <48gjqf$[e-mail]>
Date: Fri, 17 Nov 1995 17:13:43 GMT
Lines: 25

In article <48gjqf$[e-mail]> [e-mail] (Brian Buydens) writes:
>I am about one week away from getting my basic radio operators certificate
>so please excuse the "newbie" question:
>
>Are there plans available to convert a modem to a TNC?
>
>I am hoping to acquire a 2m radio in the near future and would like to
>try my hand at packet.

Does your modem support half duplex Bell 202 signaling?  If so, it
can be used for the modem section of your TNC. For the PAD function,
you'll still need to do some building and programming.

Note: most modems made after 1977 do *not* support Bell 202, and
most "smart" modems won't get out of your way and insist on doing
connections the "telco way" instead of the "radio way". In short,
any use you'd find for your telco modem on packet would be mainly
for the salvaged case and power supply.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |


From Unknown Tue Nov 21 19:05:33 1995
Path: news.epix.net!news.sprintlink.net!news.texas.net!news.kei.com!newsstand.cit.cornell.edu!newsfeed.cit.cornell.edu!cornellcs!rochester!udel!gatech2!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Dennis Ashworth)
Newsgroups: rec.radio.amateur.homebrew
Subject: Cleaning Ceramic Switches
Date: 17 Nov 95 17:59:55 GMT
Organization: ucsd usenet gateway
Lines: 9
Message-ID: <9511171759.AA22465@adphdw20>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Can someone recommend a "safe" method for cleaning high voltage ceramic
switches which have collected years of dust, and the contacts have become
tarnished? I don't want to clean them using normal household materials and
methods unless I'm certain no film or residue will remain. The application
is a tank circuit of an 1.5KW HF amplifier.

Dennis, K7FL
[e-mail]



From Unknown Tue Nov 21 19:05:35 1995
Path: news.epix.net!news.sprintlink.net!gatech2!swrinde!newsfeed.internetmci.com!in1.uu.net!news.nevada.edu!silver.scs.unr.edu!news.unr.edu!usenet
From: "Luis B.R." <[e-mail]>
Newsgroups: rec.puzzles,rec.radio.amateur,rec.radio.amateur.digital,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.cb,rec.radio.noncomm
Subject: Get us off "ham" thread, please
Date: 17 Nov 1995 21:39:50 GMT
Organization: Univ. of Nevada-Reno
Lines: 41
Message-ID: <48ivf6$[e-mail]>
NNTP-Posting-Host: 134.197.32.134
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: quoted-printable
X-Mailer: Mozilla 1.1N (Macintosh; I; 68K)
To: [e-mail]
X-URL: news:485m5d$[e-mail]
Xref: news.epix.net rec.puzzles:52170 rec.radio.amateur.digital.misc:12668 rec.radio.amateur.equipment:21504 rec.radio.amateur.homebrew:11624 rec.radio.amateur.misc:94419 rec.radio.amateur.policy:31914 rec.radio.amateur.space:5771 rec.radio.cb:24499 rec.radio.noncomm:4991

[e-mail] (InterSource ) wrote:
>In <4825eh$[e-mail]> Burt Fisher <[e-mail]> writes:
>
>>
>>I said: "I have a VIC 20 I want to trade for a IC-781" (how long do we
>>have read thesre messages where some ham wants to trade his junk for
>>something woth something).
>>
>>
>>From: KH2KQ@KA6EYH.#NOCAL.CA.USA.NOAM
>>To  : [e-mail]
>
>
>Burt there is a Salvation Army Thrift Store in Thornton Colorado (on
>Washington Blvd.) that as of last week, had a box with 4 Vic 20's for
>sale for $10 --- is that a hint ???? --- surely you were not serious
>about that type of trade or was it a typo.>

{snippage}

Would you PLEASE remove rec.skiing.alpine from your posting header for this thread. We've been trying to remove this thread for a fe=
w days now.  We greatly appreciate it. Thank you in advance.

Your friends at rec.skiing.alpine



















From Unknown Tue Nov 21 19:05:36 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!alterdial.uu.net!not-for-mail
From: Burt Fisher <[e-mail]>
Newsgroups: radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.policy,rec.radio.amateur.space
Subject: Even my wife thinks hams are...
Date: 17 Nov 1995 22:59:22 GMT
Lines: 12
Message-ID: <48j44a$[e-mail]>
References: <[e-mail]> <47uhb8$[e-mail]> <481qu5$[e-mail]> <4825eh$[e-mail]> <485m5d$[e-mail]> <485q5e$[e-mail]> <48fo6h$[e-mail]>
NNTP-Posting-Host: 199.172.47.193
Mime-Version: 1.0
Content-Type: text/plain
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)
Xref: news.epix.net rec.radio.amateur.digital.misc:12672 rec.radio.amateur.equipment:21512 rec.radio.amateur.homebrew:11630 rec.radio.amateur.policy:31925 rec.radio.amateur.space:5775

I received a call today from a ham who would not identify himself. I
repeatedly asked him who he was, even saying to him that if he had an
opinion worth anything it is reasonable to expect he state who he was.
Still he he refused. I then commented that he was "so typical ham, no guts."
My wife then told me to get off the phone and stop wasting time with
gutless hams who hide behind their mikes. As I made one more effort to
identify the caller, he hung up. He also made a veiled threat that bad
things would happen to me, I retorted I might take it more seriously if he
were not a gutless ham.

This call is just so typical of hams, brave at a distance.



From Unknown Tue Nov 21 19:05:37 1995
Path: news.epix.net!news.sprintlink.net!hookup!usenet.ins.cwru.edu!gatech2!swrinde!newsfeed.internetmci.com!realtime.net!bga.com!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: I need H.P. diodes "CHEAP"
Date: 18 Nov 1995 02:06:05 GMT
Organization: Real/Time Communications - Bob Gustwick and Associates
Lines: 5
Message-ID: <48jf2d$[e-mail]>
NNTP-Posting-Host: vern-a5.ip.realtime.net
X-Newsreader: AIR News 3.X (SPRY, Inc.)

I'm looking for HP5082-2900 screen diodes "cheap"
I.R.C. of FLA. sells them for $6 ea. "not cheap"
Anyone know a "cheap" vendor for these diodes?
                                                                               Thanks. Matt/KK5DR



From Unknown Tue Nov 21 19:05:38 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!mayonews.mayo.edu!newsdist.tc.umn.edu!umn.edu!spool.mu.edu!uwm.edu!newsspool.doit.wisc.edu!night.primate.wisc.edu!nntp.msstate.edu!cssun.mathcs.emory.edu!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: WWV propogation variability
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]>
Date: Sat, 18 Nov 1995 03:26:33 GMT
Lines: 25

In article <[e-mail]> [e-mail] writes:
>
>     I am looking at a couple things that would use WWV time service.  I
>     need to know about variations in prop delay over a short distance and
>     moderate time periods.  If two stations are separated by 300 miles or
>     so what amount will the prop delay change relative to each other?
>     This change is other than the delay due to the differences in distance
>     from the transmiter which can be modeled as a constant.  In other
>     words, if the signal is used to drive clockx that have a constant
>     compensation for the prop delay due to distance what is the worst time
>     difference in the two clocks?

For skywave, propagation delay can vary several 10s of microseconds
as the layer height changes. The differential difference depends on
the particular path geometries and is a bit harder to characterize.
If you want propagation delays that vary only by 10s of nanoseconds,
you need to look to WWVB's VLF groundwave signals. Except at sunrise
and sunset, propagation delay is very stable at VLF.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |


From Unknown Tue Nov 21 19:05:39 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!gatech2!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Cleaning Ceramic Switches
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <9511171759.AA22465@adphdw20>
Date: Sat, 18 Nov 1995 03:45:11 GMT
Lines: 28

In article <9511171759.AA22465@adphdw20> [e-mail] (Dennis Ashworth) writes:
>Can someone recommend a "safe" method for cleaning high voltage ceramic
>switches which have collected years of dust, and the contacts have become
>tarnished? I don't want to clean them using normal household materials and
>methods unless I'm certain no film or residue will remain. The application
>is a tank circuit of an 1.5KW HF amplifier.

Freon TF, trichlor, or carbon tet can be used to wash off the dirt, though
the EPA hates all those cleaning agents. Plain hot distilled water can be
used too, though it won't remove grease or oil. The addition of a surfactant
like tri-sodium phosphate will help, though the EPA doesn't like that either.
Lighter fluid can also be used to remove oily residues, though there's an
obvious fire hazard. To remove contact tarnish (assuming silver plating)
use a weak phosphoric acid mixture (Tarn-X is a commercial brand). Flush
the area throughly with hot distilled water after using acids to clean
the part.

You can just use Coca Cola Classic(tm) to clean the switch if you flush
throughly with hot water afterwards to remove the phosphoric acid and
sugar residues. Don't use Diet Coke(tm), it'll leave a difficult to remove
residue.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |


From Unknown Tue Nov 21 19:05:40 1995
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usenet
From: Wes Stewart <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: hints and pointers to PCB layout programs wanted
Date: 18 Nov 1995 03:47:05 GMT
Organization: Arizona Daily Star - AZSTARNET
Lines: 38
Message-ID: <48jkvp$[e-mail]>
References: <[e-mail]> <48gnqn$[e-mail]> <48irf1$[e-mail]>
NNTP-Posting-Host: usr1ip47.azstarnet.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)

[e-mail] (Gary Burchett) wrote:
>In article <48gnqn$[e-mail]>,
>   Wes Stewart <[e-mail]> wrote:
>>[e-mail] (Peter A. Olsen) wrote:
>>>hello homebrewers,

>>>Are there any of you who can recommend PC MS-DOS or MS-WINDOWS
>>>programs for PCB layout and/or schematics?



>>>Forget about the expensive, professional ones - it must be cheap.
>>>Two-layer and netlist support would be nice, though.





>>Peter:

>>Try: http://www.cadvision.com/htmls/apc/nwdef.html#DFWare

>>I can't really comment on it's usefullness, but it is free!

>>HTH,
>>Wes -- N7WS


>    Also, http://www.apcircuits.com/htmls/apc/apdef2.html  has the freeware
>release of DOS Easytrax from Protel Technology.  Look under DOS Freeware in
>the home page.  Also some Gerber file viewers there.
>Gary


Same place.

Wes



From Unknown Tue Nov 21 19:05:41 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!cssun.mathcs.emory.edu!gatech2!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Cleaning Ceramic Switches
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <9511171759.AA22465@adphdw20> <48ipoo$[e-mail]>
Date: Sat, 18 Nov 1995 03:58:23 GMT
Lines: 24

In article <48ipoo$[e-mail]> James Garland <[e-mail]> writes:
>I use isopropyl alcohol, which is a safe and reasonably effective solvant
>that leaves no residue. Buy the 99+% anhydrous version (which you can get
>at a drug store for about $2.00), and not the 70% rubbing alcohol
>version. Isopropyl alcohol also makes a good flux remover -- not as good
>as trichlor or some of the other solvants -- but you'll live longer to
>enjoy your rig.
>Jim W8ZR

Isopropyl alcohol will leave a residue, Ampex forbids its use for cleaning
video heads for that reason. Toluene is recomended, though of course it
attacks plastics, and the EPA hates it, or Freon TF can be used, but the
EPA hates that too. Methanol is somewhat better than isopropyl for not
leaving a residue, and its use may be tolerable, though meth is toxic
and should only be used in a well ventilated area (you could go blind).
Freon TF is the only really safe and effective solvent, but our benighted
leaders think the sky is falling and are making it harder and harder to get.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |


From Unknown Tue Nov 21 19:05:42 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Gateway)
Newsgroups: rec.radio.amateur.homebrew
Subject: NDN: Ham-Homebrew Digest V95 #388
Date: 18 Nov 95 10:41:01 GMT
Organization: Bay Networks
Lines: 5
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Sorry. Your message could not be delivered to:

Leslie Dodd,Wellfleet London (The name was not found at the remote site.
Check that the name has been entered correctly.)



From Unknown Tue Nov 21 19:05:43 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (DAVEAA1A)
Newsgroups: rec.radio.amateur.homebrew
Subject: Frequency Calibration, Frequency Netting, 3.58 Mhz and Loran 'C'
Date: 18 Nov 1995 13:06:15 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 18
Sender: [e-mail]
Message-ID: <48l7an$[e-mail]>
Reply-To: [e-mail] (DAVEAA1A)
NNTP-Posting-Host: newsbf02.mail.aol.com

Can anyone steer me towards articles using 3.579545 color burst off
network
or using Loran 'C' pulses to use as frequency standard and also
multiplyers and programmable dividers to come up with 100khz  1 mhz  etc.

I am current stripping Newtork Burst at 3.579545 and find some are better
than others. Also Loran 'C' from here is Chain #9960 which comes out to a
freq. near 10 khz and multiplies 249 times to 2.5 mhz with precesion to 3
hertz at 10ghz.
I get .000256ppm.  Will be ultra phase locking my 10ghz brick so as to
make way
for spread spectrum and sync-lock. So far so good. will like to swap
stories
with like minded folks.

Thanks for any help.
[e-mail]



From Unknown Tue Nov 21 19:05:44 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (DAVEAA1A)
Newsgroups: rec.radio.amateur.homebrew
Subject: laser comms
Date: 18 Nov 1995 13:25:40 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 11
Sender: [e-mail]
Message-ID: <48l8f4$[e-mail]>
Reply-To: [e-mail] (DAVEAA1A)
NNTP-Posting-Host: newsbf02.mail.aol.com

Hello,
Anybody out there building laser comms? I'm using 632/680/780 nm for
voice, video, data.
Another friend and I have tried a twelve mile path and ended up with many
excess db's, like 40 or so. It's cheap, fun, and interesting.
Am using the PIN photo diodes and a killer low noise amp and transmitting
on 20 dollar small diodes 5 milliwatt. This stuff is like my first run in
with a crystal set 50 years ago.
CQ-laser de [e-mail]

73 and tnx


From Unknown Tue Nov 21 19:05:44 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!info.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Gateway)
Newsgroups: rec.radio.amateur.homebrew
Subject: NDN: Ham-Homebrew Digest V95 #389
Date: 18 Nov 95 13:32:09 GMT
Organization: Bay Networks
Lines: 5
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Sorry. Your message could not be delivered to:

Leslie Dodd,Wellfleet London (The name was not found at the remote site.
Check that the name has been entered correctly.)



From Unknown Tue Nov 21 19:05:45 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (DAVEAA1A)
Newsgroups: rec.radio.amateur.homebrew,sci.electronics
Subject: Re: WWVB reciever?
Date: 18 Nov 1995 14:37:20 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 19
Sender: [e-mail]
Message-ID: <48lclg$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail] (DAVEAA1A)
NNTP-Posting-Host: newsbf02.mail.aol.com
Xref: news.epix.net rec.radio.amateur.homebrew:11645 sci.electronics:159764

Hi
I just got off a tanker on the west coast which i work on and copied wwvb
20 db over noise on the console receiver at 60khz.
It gets to new england weaker here if i use a voltage probe antenna narrow
band and out in the 'quiet' woods.
Now i'm stripping off 3.579545 from cable t.v. network sync and getting
some good 10-9th numbers.
Also stripping loran 'C' from Nantucket comes out at 9960 plus the zero
for the time in microseconds then into 1 gives a signal just over 10khz
when multiplied
by 249 gives 2.5mhz at .000256 ppm 'wow'
Depending accuracy of loran can see 3 hertz error in my 10ghz transverter.
Can steer you to some good tips towards 'quiet' l.f. antenna and scoop
that
45 degree phase shifted 60 khz carrier from boulder, co. It should be very
useful.
I want to spread spectrum and to c.c.w./data
Soon we will all be 'Gen-Locked' for 29 bux at Radio Shack unit maybe??.
Tnx and 73's from   [e-mail]


From Unknown Tue Nov 21 19:05:46 1995
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!agate!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (DAVEAA1A)
Newsgroups: rec.radio.amateur.homebrew,sci.electronics
Subject: Re: WWVB reciever?
Date: 18 Nov 1995 15:09:30 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 9
Sender: [e-mail]
Message-ID: <48lehq$[e-mail]>
References: <47kcpq$[e-mail]>
Reply-To: [e-mail] (DAVEAA1A)
NNTP-Posting-Host: newsbf02.mail.aol.com
Xref: news.epix.net rec.radio.amateur.homebrew:11651 sci.electronics:159784

Wayne
I did use these MINI-CIRCUIT bnlock gain and tuned ckts for
T.R.F. receiver hook up for vlf WWVB
Also use J-FET preamp out in the 'quiet' woods for receiving.
Havnt made end of TRF run digital stuff yet tho.

It's worth doing I'm sure.

[e-mail]


From Unknown Tue Nov 21 19:05:47 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (The2X4)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need Help  - Parallel!
Date: 18 Nov 1995 15:17:48 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 19
Sender: [e-mail]
Message-ID: <48lf1c$[e-mail]>
References: <48dq7b$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <48dq7b$[e-mail]>, [e-mail] (Thom)
writes:

>
>For example I'm presently building a keyer which call for a 91K resitor.
>I have a 100K resistor, so how do I (in a simple manor) determine what
>value to put across the 100K?  (Now in reality I'll wind going with the
>100K as close enough, but that's cheating).
>
>

Hi
Why not pur a 68K and a 22K in series. 90K should work.
You might even get closer by testing the value of several.

As simple as that.

Carl
The2x4


From Unknown Tue Nov 21 19:05:48 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Cleaning Ceramic Switches
Date: 18 Nov 1995 15:18:55 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 33
Sender: [e-mail]
Message-ID: <48lf3f$[e-mail]>
References: <9511171759.AA22465@adphdw20>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <9511171759.AA22465@adphdw20>, [e-mail]
(Dennis Ashworth) writes:

>Can someone recommend a "safe" method for cleaning high voltage ceramic
>switches which have collected years of dust, and the contacts have become
>tarnished? I don't want to clean them using normal household materials
and
>methods unless I'm certain no film or residue will remain. The
application
>is a tank circuit of an 1.5KW HF amplifier.
>
>Dennis, K7FL
>[e-mail]

Hi Dennis,

Since I deal with high power RF design and service all day, I thought I'd
throw my 2 cents in.

I wouldn't do more than blow the switch out with freon or high pressure
air. The tarnish doesn't hurt a thing, leave it alone!!!! It's probably
silver oxide, and will wipe away by contact pressure at the contact point
all on it's own. It looks worse than it really is.

If the switch is coated with tar or goo from smoking, I'd use
alcaholanhydrous alcohol.

Remember if you leave ANY conductive film on the ceramic, you can destroy
the switch. This situation has unique requirements. I wouldn't soak it in
ANYTHING that might dry and leave a goo, even nice things like Root Beer
or Kool-aid.

73 Tom


From Unknown Tue Nov 21 19:05:49 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!info.ucla.edu!galaxy.ucr.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Seth Taylor)
Newsgroups: rec.radio.amateur.homebrew
Subject: Cleaning Ceramic Switches
Date: 18 Nov 95 15:53:50 GMT
Organization: ucsd usenet gateway
Lines: 11
Message-ID: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Another substitute that I have used for anhydrous alcohol is the
stuff they sell in auto parts store as fuel line anti freeze. It
has little water if any and is a suitable sub for the drug store stuff
that can be priced high, only because it's sterile. Get the isopropol
stuff. I guess if it had any water in it anyway, it would'nt be a good
fix for fuel line freeze up. If it had any other bad stuff in it, it would
gum up fuel injectors etc. I've used the stuff with no ill effects when
I need an alcohol cleaning agent. Does anyone have any comments or experience
with using fuel line antifreeze in this manner ?

Seth KC2WE


From Unknown Tue Nov 21 19:05:50 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (DAVEAA1A)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: VLF Voltage Probe?
Date: 18 Nov 1995 16:08:53 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 7
Sender: [e-mail]
Message-ID: <48li15$[e-mail]>
References: <47lbe4$[e-mail]>
Reply-To: [e-mail] (DAVEAA1A)
NNTP-Posting-Host: newsbf02.mail.aol.com

Oh sure,
you can use the famous W1LM and AA1A voltage probe of 1985, it can
hear a fart a thousand miles away.
It available on the .49 repeater.

73
de [e-mail]


From Unknown Tue Nov 21 19:05:52 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!news1.digital.com!decwrl!amd!netcomsv!uu4news.netcom.com!netcomsv!uu3news.netcom.com!ix.netcom.com!netcom.com!rohrwerk
From: [e-mail] (John Seboldt)
Subject: Re: NE602 sources ?
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
References: <[e-mail]> <47u0v8$[e-mail]> <481os1$[e-mail]> <48asfv$[e-mail]>
Date: Sat, 18 Nov 1995 17:49:06 GMT
Lines: 21
Sender: [e-mail]

Jim Devenport <[e-mail]> writes:


>Believe it or not I just looked at the relatively new DigiKey
>web page and found they sell the NE602 for $2.35 or so in
>single lot quantities.
>Looks like you can order from them online:
>http://www.digikey.com/

>Look for digikey parts in:
>http://www.digikey.com/PartSearch.html

This is a great new service!  And it confirms that, if you don't see
something in the catalog, ASK THEM!  I found this to be the case for the
NE5514 quad op amp -- not in the catalog, but I asked them and they had it.

: John Seboldt  [e-mail]  / CW:  It don't mean a thing
:      K0JD... Minneapolis, MN      /  if it ain't got that swing!
:   My R2/T2 station described in  / Di dah, di dah, di dah, di dah...
> http://www.lehigh.edu/lists/qrp-l/k0jd/index.html <



From Unknown Tue Nov 21 19:05:53 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsat!engineer.mrg.uswest.com!news.uoregon.edu!mayonews.mayo.edu!newsdist.tc.umn.edu!umn.edu!spool.mu.edu!uwm.edu!vixen.cso.uiuc.edu!sdd.hp.com!elroy.jpl.nasa.gov!swrinde!newsfeed.internetmci.com!in1.uu.net!news1.digital.com!decwrl!amd!netcomsv!uu4news.netcom.com!netcomsv!uu3news.netcom.com!ix.netcom.com!netcom.com!rohrwerk
From: [e-mail] (John Seboldt)
Subject: Re: DC rx verses *.*
Nization: TRL <[e-mail]>
Message-ID: <[e-mail]>
Keywords: DC receivers
Ferences: <[e-mail]> <47uhb8$[e-mail]> <481qu5$[e-mail]> <4825g6$[e-mail]> <487hjv$[e-mail]> <[e-mail]> <488amm$[e-mail]> <488jq0$[e-mail]>Orga
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
References: <[e-mail]> <47uhb8$[e-mail]> <481qu5$[e-mail]> <4825g6$[e-mail]> <487hjv$[e-mail]> <[e-mail]> <488amm$[e-mail]> <488jq0$[e-mail]>Re
Date: Sat, 18 Nov 1995 18:01:55 GMT
Lines: 26
Sender: [e-mail]

[e-mail] (Drew Diamond) writes:

>However, with a little care, and good design, they can be made to perform
>extra-ordinarily well (see QST Jan '93 for Rick Campbell's High Performance
>single signal receiver- for instance, also his ground-breaking article in
>QST Aug '92 on high performance DC receivers).
...

>resulting in an apparent doubling of the receiver's bandpass.. However, to
>offset this disadvantage to some extent, is the beautiful "feel" or purity of
>sound offered by a well made DC receiver. It's a bit like looking at the sky
>at night, in the country, far away from smog and the city lights- signals
>stand out bright and clear. This is thought to be due to the fewer number of
>tuned circuits and other active devices through which signals (and noise) must
>pass- with their impulse stretching effects.

What a poet -- and exactly how I feel with my R2.  My feeling when I
first turned it on on 40 meters at 2 am after finishing it was "surfing
the ether", and I still feel that way every time I turn it on.

: John Seboldt  [e-mail]  / CW:  It don't mean a thing
:      K0JD... Minneapolis, MN      /  if it ain't got that swing!
:   My R2/T2 station described in  / Di dah, di dah, di dah, di dah...
> http://www.lehighedu/lists/qrp-l/k0jd/index.html <




From Unknown Tue Nov 21 19:05:55 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.starlink.com!usenet
From: Bill Funk <[e-mail]>
Newsgroups: rec.puzzles,rec.puzzles.crosswords,rec.pyrotechnics,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.cb,rec.radio.noncomm,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap,rec.roller-coaster,rec.running,rec.scouting,rec.scuba,rec.skiing.alpine
Subject: Re: What some think about sexy hams
Date: 18 Nov 1995 18:10:20 GMT
Organization: Star Link Internet Services
Lines: 19
Message-ID: <48l7ic$[e-mail]>
References: <[e-mail]> <47uhb8$[e-mail]> <481qu5$[e-mail]> <4825g6$[e-mail]> <487hjv$[e-mail]> <48be57$[e-mail]>
NNTP-Posting-Host: pm1-29.starlink.com
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>Speaking of HAM radios, could this group help me out?  Every time I go and
>dive with my radio set, the fuse blows.  What's the trick here?
>

Ah, yes...
There was a time when having a HAM ticket *meant* something...
When a fuse blows consistantly, it's because there's more current going
thru the fuse than the fuse is rated to carry. The fuse, being a safety
device, blows to prevent this excess current from flowing, possibly
damaging something.
Check to make sure the fuse is the proper rating for the gear. Do *not*
replace it with a higher-rated fuse! If it is the correct fuse, then the
gear is drawing too much current. This needs to be corrected. Maybe it's a
short in the power line, maybe the gear is not a boat anchor. Either
extreme, and all points in between should be checked, and corrected.
Good luck.
Bill



From Unknown Tue Nov 21 19:05:56 1995
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!in2.uu.net!ulowell.uml.edu!vtc.tacom.army.mil!news2.acs.oakland.edu!detroit.freenet.org!detroit.freenet.org!aa024
From: [e-mail] (Kenneth Vito Zichi)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.cb,rec.radio.noncomm,rec.radio.scanner,rec.radio.swap
Subject: Hams please read ....
Date: 18 Nov 1995 20:10:55 GMT
Organization: Greater Detroit Free-Net, Detroit, MI
Lines: 18
Message-ID: <48lekf$[e-mail]>
Reply-To: [e-mail] (Kenneth Vito Zichi)
NNTP-Posting-Host: detroit.freenet.org
Xref: news.epix.net rec.radio.amateur.antenna:17204 rec.radio.amateur.digital.misc:12685 rec.radio.amateur.equipment:21533 rec.radio.amateur.homebrew:11646 rec.radio.amateur.misc:94464 rec.radio.amateur.policy:31941 rec.radio.amateur.space:5780 rec.radio.cb:24521 rec.radio.noncomm:4995 rec.radio.scanner:40863 rec.radio.swap:51239


If you guys want to spam all the rec radio amateur gorups I couldn't care less
but why the H*ll are these stupid ham debate posts spilling into the
shortwave, scanner and puzzles (among others) groups.  Watch the
reply lines guys.  One spam is bad enough but when you all reply to all
the groups it is just plain RUDE.

Leave the rest of us in peace -- and if your must spam, do it via e-mail
to the original poster and again, leave the rest of us in peace.

Thanks for letting me rant.   73  //kvz


--
kv zichi,  [e-mail]
                                      (PGP Public Key Available on Request)
"Lasciate ogni speranza, voi ch'entrante"  --Dante
         Kind of appropriate for the Internet, eh?


From Unknown Tue Nov 21 19:05:57 1995
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!newsxfer.itd.umich.edu!tank.news.pipex.net!pipex!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (DAVEAA1A)
Newsgroups: rec.radio.amateur.homebrew
Subject: FREQUENCY CALIBRATION, STANDARDS
Date: 18 Nov 1995 20:12:27 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 10
Sender: [e-mail]
Message-ID: <48m09r$[e-mail]>
Reply-To: [e-mail] (DAVEAA1A)
NNTP-Posting-Host: newsbf02.mail.aol.com

Hi,
Anybody out there into 3.579545 color burst stripping, dividing to 1mhz or
100 khz?
Anybody using Loran 'c' pulses for ultra accurate timing??
Can you steer me towards any of the above?

tnx

de [e-mail]



From Unknown Tue Nov 21 19:05:58 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (DAVEAA1A)
Newsgroups: rec.radio.amateur.homebrew,sci.electronics
Subject: Re: WWVB reciever?
Date: 18 Nov 1995 20:46:21 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 13
Sender: [e-mail]
Message-ID: <48m29d$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail] (DAVEAA1A)
NNTP-Posting-Host: newsbf02.mail.aol.com
Xref: news.epix.net rec.radio.amateur.homebrew:11654 sci.electronics:159800

Hi Wayne
I'm new to internet but use Mini-Circuits for block gain at wwvb freq to
get
accurate 60khz into shack from voltage probe out in the woods with
simple tunes 'j' fet.
Also strip 3.579545 from color burst oscillator on network sync.
Am looking for best multiplier/divider loop to get 'standard' freqs from
this
very accurate source.
Also using the 9960 chain of the Nantucket Loran 'C' which when multiplied
249 times is 2.5mhz with .000256 ppm  'wow'
Am looking to phase lock my 10ghz brick to within about 3hz...
Hope this got there,   de   [e-mail]


From Unknown Tue Nov 21 19:05:59 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!nntp.crl.com!crl5.crl.com!not-for-mail
From: [e-mail] (Henry B. Smith)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc
Subject: Before you respond to Burt
Date: 18 Nov 1995 21:58:00 -0800
Organization: Dallas, TX
Lines: 34
Message-ID: <48mh18$[e-mail]>
NNTP-Posting-Host: crl5.crl.com
X-Newsreader: TIN [version 1.2 PL2]
Xref: news.epix.net rec.radio.amateur.homebrew:11656 rec.radio.amateur.antenna:17215 rec.radio.amateur.digital.misc:12699

Please, those of you who are responding to the "Burt" posts are not just
posting to this newsgroup, you are also posting to:

rec.puzzles,rec.puzzles.crosswords,rec.pyrotechnics,rec.radio.amateur.antenna,
rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,
rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,
rec.radio.amateur.space,rec.radio.cb,rec.radio.noncomm,rec.radio.scanner,
rec.radio.shortwave,rec.radio.swap,rec.roller-coaster,rec.running,
rec.scouting,rec.scuba,rec.skiing.alpine

These newsgroups are included in the "reply to" part of the header of the
"Burt" messages.

Some of these newsgroups have nothing to do with ham radio and they are
rightfully complaining.

This is not my attempt to be a "newsgroup cop".  Some of you simply
were not aware of this crossposting issue.

Burt seems to be attempting to show the dark side of hamdom and by using
this crossposting technique,  He is succeeding.

BTW, I am crossposting this message (hopefully) to the following
newgroups:
    rec.radio.amateur.digital.misc
    rec.radio.amateur.homebrew
    rec.radio.amateur.antennas

If you wish to respond to me, do it directly to [e-mail]. Dont bother the
newsgroups.

--
Henry Smith ([e-mail])



From Unknown Tue Nov 21 19:06:00 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!brighton.openmarket.com!decwrl!tribune.usask.ca!aa266
From: [e-mail] (Graeme Humphries)
Newsgroups: rec.puzzles,rec.puzzles.crosswords,rec.pyrotechnics,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.cb,rec.radio.noncomm,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap,rec.roller-coaster,rec.running,rec.scouting,rec.scuba,rec.skiing.alpine
Subject: Re: The idiot ham trade.
Followup-To: rec.puzzles,rec.puzzles.crosswords,rec.pyrotechnics,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.cb,rec.radio.noncomm,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap,rec.roller-coaster,rec.running,rec.scouting,rec.scuba,rec.skiing.alpine
Date: 18 Nov 1995 23:09:32 GMT
Organization: Saskatoon Free-Net
Lines: 1
Message-ID: <48lp3c$[e-mail]>
References: <[e-mail]> <47uhb8$[e-mail]> <481qu5$[e-mail]> <4825eh$[e-mail]>
NNTP-Posting-Host: broadway.sfn.saskatoon.sk.ca
X-Newsreader: TIN [version 1.2 PL2]
Xref: news.epix.net rec.puzzles:52193 rec.puzzles.crosswords:4624 rec.pyrotechnics:37757 rec.radio.amateur.antenna:17205 rec.radio.amateur.digital.misc:12687 rec.radio.amateur.equipment:21534 rec.radio.amateur.homebrew:11648 rec.radio.amateur.misc:94470 rec.radio.amateur.policy:31944 rec.radio.amateur.space:5781 rec.radio.cb:24524 rec.radio.noncomm:4996 rec.radio.scanner:40866 rec.radio.shortwave:66232 rec.radio.swap:51250 rec.roller-coaster:23237 rec.running:45504 rec.scouting:37799 rec.scuba:80625 rec.skiing.alpine:33269

        What about free BEEF???


From Unknown Tue Nov 21 19:06:00 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!agate!dog.ee.lbl.gov!overload.lbl.gov!lll-winken.llnl.gov!hookup!news.mathworks.com!news.kei.com!simtel!swidir.switch.ch!scsing.switch.ch!news.belwue.de!news.uni-ulm.de!rz.uni-karlsruhe.de!news.uni-stuttgart.de!linux.rz.fh-hannover.de!popeye.extern.fh-hannover.de!Stephan
Date: 19 Nov 1995 04:36:00 +0100
From: [e-mail] (Stephan)
Newsgroups: rec.radio.amateur.homebrew,comp.robotics.misc,sci.electronics,rec.radio.amateur.misc
Message-ID: <5y8dcn8$[e-mail]>
Subject: ? Voice-Mailbox ?
X-Newsreader: CrossPoint v3.1
Lines: 14
Xref: news.epix.net rec.radio.amateur.homebrew:11666 comp.robotics.misc:1911 sci.electronics:159898 rec.radio.amateur.misc:94528

Hello all...

Do anybody know how 2 build a voice-mailbox using an external selfmade
switching-option and a standard soundcard in your computer ?

I heard from some hams that there are construction-plans and software
available...but I do not know where.....

Please help...

dl4oca, Stephan





From Unknown Tue Nov 21 19:06:02 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!solaris.cc.vt.edu!homer.alpha.net!uwm.edu!spool.mu.edu!darwin.sura.net!rouge.usl.edu!jpd
From: [e-mail] (Dugal James P.)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: What's circulator good for? was Re: How does "circulator" work?
Date: 19 Nov 1995 19:30:16 GMT
Organization: Univ. of Southwestern La., Lafayette
Lines: 16
Message-ID: <48o0k8$[e-mail]>
References: <481p4s$[e-mail]> <4835ej$[e-mail]>
NNTP-Posting-Host: smh323s.ucs.usl.edu


Perhaps I missed a posting on this point, but I think the circulator
(or isolator) has the best benefit NOT of making the transmitter immune
to SWR variations, but in keeping received RF out of the transmitter.
Imagine a paging transmitter on a tower using 152.48 MHz.  Now suppose
a competitor locates their 157.74 transmitter on the same tower.
What do you think the 3-rd order mixing product is?  Yep, 147.22 MHz.
Since pagers run rather high power, and often use no cavities, they
help us keep our 2m band occupied :-( .

73,
--
-- James Dugal, N5KNX           Internet: [e-mail]
Associate Director              Ham packet: n5knx@k5arh.#lft.la.usa.noam
Computing Center                US Mail: PO Box 42770  Lafayette, LA  70504
University of Southwestern LA.  Tel. [phone]       U.S.A.


From Unknown Tue Nov 21 19:06:03 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news
From: Sandy Blaize, W5TVW <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.swap
Subject: "Junkers" wanted..
Date: 19 Nov 1995 20:18:37 GMT
Organization: Alligator Amateur Radio of the South
Lines: 8
Message-ID: <48o3et$r2s$[e-mail]>
Xref: news.epix.net rec.radio.amateur.homebrew:11658 rec.radio.swap:51300

Want a couple of junker ARC-5 or SCR-274N receivers.  Want
55-1.6 Mhz model (BC-946), 3-6 Mhz (BC-454).  Not interested in
covers, tubes, dynamotors....just want chassis with IF/RF
transformers and coil sets.  What have you?  Would also like the
BC-453 and 1.5-3.0 Mhz version, although these are getting rare.
Want parts for building projects.
Sandy W5TVW,
Internet:[e-mail]


From Unknown Tue Nov 21 19:06:03 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news
From: Sandy Blaize, W5TVW <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.swap
Subject: FT-243 crystals wanted...
Date: 19 Nov 1995 20:20:21 GMT
Organization: Alligator Amateur Radio of the South
Lines: 4
Message-ID: <48o3i5$r2s$[e-mail]>
Xref: news.epix.net rec.radio.amateur.homebrew:11661 rec.radio.swap:51327

Looking for a small quantity (10-20) of FT-243 crystals in the
3.4-3.6 Mhz range.  What have you in the junk box?
73,
Sandy W5TVW


From Unknown Tue Nov 21 19:06:05 1995
Path: news.epix.net!news.sprintlink.net!EU.net!Belgium.EU.net!ping.be!dialup31.hasselt.eunet.be!jan.anker
From: [e-mail] (Jan Anker)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re:Where is QEX?
Date: Mon, 20 Nov 1995 00:47:06
Organization: Anchor Datacomm
Lines: 33
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: dialup31.hasselt.eunet.be
X-Newsreader: Trumpet for Windows [Version 1.0 Rev A]

In article <[e-mail]> [e-mail] writes:
>From: [e-mail]
>Subject: Re:Where is QEX?
>Date: 16 Nov 95 15:20:30 GMT

>I understand that Jon Bloom (the editor) and his wife both work for ARRL in
>publications.  They had a baby this summer (their first) and this has
>interrupted the schedule for QEX.

>I received my September issue Monday.

>Honest, Jon and his crew (if there is anyone besides him) are working furiously
>to get the magazine back on schedule.  Jon tells me that we will get ALL of the
>issues, albeit a little late.  I talked to Zack Lau at Microwave update, so I
>know that articles for each of the issues are to Jon.  All Jon needs to do is
>get the magazines edited and put together.

>My request to y'all is to give Jon until the first of the year at least before
>you get too upset.

>I thank you and I'm sure Jon appreciates any understanding on this.

>Ray Mack
>WD5IFS
>[e-mail]

I like to understand but why I dont get any info about the above. Why not
mention this in the september issue which I just received!

I value(d) qex vy hi and just paid a full year subscription again without
knowing if QEX still was there.
QEX is an ARRL org so we should ARRL for this!



From Unknown Tue Nov 21 19:06:06 1995
Path: news.epix.net!news.sprintlink.net!news.scott.net!acara.snsnet.net!HiWAAY.net!imci2!newsfeed.internetmci.com!news.kei.com!simtel!harbinger.cc.monash.edu.au!lugb.latrobe.edu.au!sheoak.bendigo.latrobe.edu.au!snowgum!rice
From: [e-mail] (Phil Rice)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Combining 2 Amplifiers?
Date: 20 Nov 1995 03:02:20 GMT
Organization: Dept Computing, UCNV, Bendigo, Australia
Lines: 10
Distribution: world
Message-ID: <48or3s$[e-mail]>
NNTP-Posting-Host: snowgum.bendigo.latrobe.edu.au
Summary: It is possible.


Have a look at Motorola application note AN758.  This describes a
1.6MHz to 30MHz 1KW amplifier which consists of a 4-way splitter
4 broadband amplifiers and a 4-way combiner.
With 4 identical amplifiers there is no power dissipated in resistors
in the combiner.  Any gain and/or phase errors (including complete
failure of a module) cause power to be dissipated in the combiner.

73 de Phil VK3BHR



From Unknown Tue Nov 21 19:06:07 1995
Path: news.epix.net!news.sprintlink.net!news.scott.net!acara.snsnet.net!HiWAAY.net!imci2!newsfeed.internetmci.com!news.westnet.com!news.internetMCI.com!darwin.sura.net!bcfreenet.seflin.lib.fl.us!bcfreenet!z007298b
From: [e-mail] (Eliot Fenton)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Cleaning Ceramic Switches
Date: 20 Nov 1995 04:04:59 GMT
Organization: SEFLIN Free-Net - Broward
Lines: 24
Message-ID: <48oupb$[e-mail]>
References: <9511171759.AA22465@adphdw20> <[e-mail]>
NNTP-Posting-Host: bcfreenet.seflin.lib.fl.us
X-Newsreader: TIN [version 1.2 PL2]

Gary Coffman ([e-mail]) wrote:
: In article <9511171759.AA22465@adphdw20> [e-mail] (Dennis Ashworth) writes:
: >Can someone recommend a "safe" method for cleaning high voltage ceramic
: >switches which have collected years of dust, and the contacts have become
: >tarnished? I don't want to clean them using normal household materials and
: >methods unless I'm certain no film or residue will remain. The application
: >is a tank circuit of an 1.5KW HF amplifier.

The best chemical I have found for removing deposits is "Gunk Carb Medic"
carb. and choke cleaner, available at most auto discount stores.  I've
used Tri-chloro (very expensive and an EPA no-no), various alcohols and
acetones, but Carb Medic (at 2 bucks a can) seems to work best.  Only thing
is it will eat practically ANY plastic (excluding teflons and their
derivatives) or pertroleum based product. It also has quite an odor, so
be sure to use it in a well ventilated area.  The stuff is normally
highly flammable, but to my knowledge does not leave a residue, so it
should be safe for your application.

------------------------------------------------------------

Eliot Fenton
[e-mail]
Compuserve: [e-mail]



From Unknown Tue Nov 21 19:06:08 1995
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!ulowell.uml.edu!vtc.tacom.army.mil!agis!usenet.eel.ufl.edu!newsfeed.internetmci.com!news-feed.mci.newscorp.com!news.delphi.com!usenet
From: [e-mail] (Joanne Dow)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: frequency standard using GPS?
Date: 20 Nov 1995 11:37:26 GMT
Organization: Delphi Internet Services Corporation
Lines: 35
Message-ID: <48pp9m$[e-mail]>
References: <48ij9i$[e-mail]>
Reply-To: [e-mail] (Joanne Dow)
NNTP-Posting-Host: bix.com
X-Newsreader: NetBix 1.225
X-Newsreader-Author: [e-mail] (Loren Wilton)
    This message has been posted with development version software.
    If there are any problems with the message format, send me mail.

In article <48ij9i$[e-mail]>, [e-mail] () wrote:
>Hi,
>
>I'm in need of a good frequency standard at 10 MHz for my counter.
>
>Does anybody know articles / equipment / diagrams etc to do this with
>a GPS receiver ? Is it usable for this purpose ?

Most are not.  Usually there is only a software phaselocked loop with an
oscillator in the receiver of at best TCXO accuracy levels.  Therefore there is
no handy frequency available to tap off a real 10.23MHz signal.

All the satellites are on slightly different frequencies as they reach the
receiver due to Doppler shift.  Hence the PLL is necessary anyway.  So aside
from making acquisition faster there is little or no need for a very accurate
clock in a GPS receiver even though GPS can be used as a source for a time
standard.  (And I think there is at least one company making a standard
stabilized by a custom GPS receiver.)

If your local TV station uses modern practice and stabilizes their color
subcarrier with a rubidium or cesium standard you can get quite accurate results
by locally disciplining an oscillator using a phase lock loop to the recovered
subcarrier. You divide the subcarrier by 63 and a 5MHz standard by 88 to feed
the phase detector for the 5MHz standard. (Erm - at least in the US you can do
this. The constants for PAL would be a tad different I suspect. But it should be
doable there as well.)

>73 Joop, pe1dna
>
>[e-mail]
>PE1DNA @ PI8ZAA.#NBO.NLD.EU
>

{^_^}     Joanne Dow     The Wizardess



From Unknown Tue Nov 21 19:06:10 1995
Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!news.emf.net!overload.lbl.gov!agate!howland.reston.ans.net!swrinde!newsfeed.internetmci.com!miwok!ultra.sonic.net!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news
From: Zack Lau <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Tech Errors.... Common?
Date: 20 Nov 1995 13:58:37 GMT
Organization: American Radio Relay League
Lines: 38
Message-ID: <48q1id$[e-mail]>
References: <48fvua$[e-mail]>
NNTP-Posting-Host: mgate.arrl.org
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2N (Windows; I; 16bit)
To: [e-mail]

N1QDQ pete brunelli <[e-mail]> wrote:
>I know that it is prudent to wait an issue or two before diving into
>a homebrew design from QST, but the November issue was chock full.
>The 20M QRP rig appears to have been a forest of errors and omissions
>and the broadband transmitting wire article was pathetic considering the
>lack of complexity.
>
>This is not as much flame-bait as an observation by a ham who is trying
>to justify renewing my league membership which has lapsed for about a year.
>Maybe the additional support will equal better tech editing, but since the
>tech editor was "behind the diamond" in the same issue, i doubt it.

I'm still in the process of insuring that I get to spend a few
hours looking at every article.  In the past, there were some
that apparently went to press without me getting a good look at,
especially during the busy conference season when I'm out of the
office.  Getting rid of those errors is quite a priority at HQ,
I'm spending a lot more time looking at articles and less time
writing stuff up.  (I just tested a 2M directional coupler with
30 dB directivity and realized I designed and etched the circuit
board back in April).

There is still a posting for an Assistant Technical Editor--paying
32-35k. We could certainly use an expert on everything to spot those
technical errors.

Zack [e-mail].
>
>------------------------------------------------------------------
>Pete Brunelli                             Amateur Call N1QDQ
>             Check out http://www.connix.com/~pcb
>            Home of the Rolling Thunder Contest Club
>               Mobileering for a Better Tomorrow
>------------------------------------------------------------------
>
>




From Unknown Tue Nov 21 19:06:11 1995
Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!jaxnet.jaxnet.com!uunet!in1.uu.net!noc.near.net!usenet.continental.com!usenet
From: Paul Christensen <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: DSP for the R2?
Date: 20 Nov 1995 14:02:13 GMT
Organization: Continental Cablevision
Lines: 6
Message-ID: <48q1p5$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: 169.152.167.70
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)
To: [e-mail]

12 bits is more like 72 dB rather than 85 dB:  2 raised to the 12th
power, take the common log and multiply the result by 20.

-Paul, N9AZ




From Unknown Tue Nov 21 19:06:11 1995
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!news.kei.com!simtel!news00.sunet.se!sunic!news99.sunet.se!news.uni-c.dk!unidhp.uni-c.dk!srv2.gbar.dtu.dk!g0110089
From: [e-mail] (Matematisk Analyse 1)
Newsgroups: rec.radio.amateur.homebrew
Subject: making a RC unit
Date: 20 Nov 1995 14:05:31 GMT
Organization: DTU
Lines: 1
Message-ID: <48q1vb$[e-mail]>
NNTP-Posting-Host: srv2.gbar.dtu.dk
X-Newsreader: TIN [version 1.2 PL1]




From Unknown Tue Nov 21 19:06:12 1995
Path: news.epix.net!news.sprintlink.net!news.bluesky.net!solaris.cc.vt.edu!newsfeed.internetmci.com!in1.uu.net!news00.sunet.se!sunic!news99.sunet.se!newsfeed.tip.net!news.algonet.se!usenet
From: [e-mail] (Christer Johansson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Baycom and Windows
Date: Mon, 20 Nov 1995 19:09:32 GMT
Organization: HTH
Lines: 16
Message-ID: <48qjp9$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: sophocles.algonet.se
X-Newsreader: Forte Free Agent 1.0.82

Hi,

Anyone knows if the software for Baycom are going
to be ported to Windows 95 ?

Regards,

/Christer

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
 * High Tech Horizon - Christer Johansson - * email: [e-mail] *
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
 * Vi saljer Parallax, Inc. BASIC Stamp's produkter i Skandinavien *
    >> World Wide Web - http://www.algonet.se/~cj/catalog.html <<
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-



From Unknown Tue Nov 21 19:06:14 1995
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.cb,rec.radio.noncomm,rec.radio.scanner,rec.radio.shortwave,re
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!ncar!uchinews!gw2.att.com!oucsboss!pc176x1.phy.ohiou.edu!user
From: [e-mail] (Tom Perigrin)
Subject: Re: What some think about sexy hams
X-Nntp-Posting-Host: pc176x1.phy.ohiou.edu
Message-ID: <[e-mail]>
Sender: [e-mail]
X-Nntp-Posting-Date: Mon Nov 20 15:43:47 1995
Organization: AI Chem Lab
References: <[e-mail]> <47uhb8$[e-mail]> <481qu5$[e-mail]> <4825g6$[e-mail]> <487hjv$[e-mail]> <48be57$[e-mail]> <48l7ic$[e-mail]> <48q0d2$[e-mail]>
Date: Mon, 20 Nov 1995 20:43:48 GMT
Lines: 39
Xref: news.epix.net rec.radio.amateur.antenna:17242 rec.radio.amateur.digital.misc:12716 rec.radio.amateur.equipment:21589 rec.radio.amateur.homebrew:11674 rec.radio.amateur.misc:94550 rec.radio.amateur.policy:31968 rec.radio.amateur.space:5794 rec.radio.cb:24565 rec.radio.noncomm:4998 rec.radio.scanner:40944 rec.radio.shortwave:66305

In article <48q0d2$[e-mail]>, Bob Crownfield
<[e-mail]> wrote:
>
> Bill Funk <[e-mail]> wrote:
> >
> >>Speaking of HAM radios, could this group help me out?  Every time I go and
> >>dive with my radio set, the fuse blows.  What's the trick here?
> >>
> >
> >Ah, yes...
> >There was a time when having a HAM ticket *meant* something...
> >When a fuse blows consistantly, it's because there's more current going
> >thru the fuse than the fuse is rated to carry. The fuse, being a safety
> >device, blows to prevent this excess current from flowing, possibly
> >damaging something.
> >Check to make sure the fuse is the proper rating for the gear. Do *not*
> >replace it with a higher-rated fuse! If it is the correct fuse, then the
> >gear is drawing too much current. This needs to be corrected. Maybe it's a
> >short in the power line, maybe the gear is not a boat anchor. Either
> >extreme, and all points in between should be checked, and corrected.
> >Good luck.
> >Bill
> >
>
> Bill:
>       Why are you talking about radios in rec.scuba? How did this ham
> chat get lost in rec.scuba in the first place?

Personally, I think a group of less than laudable people got together and
decided to have fun by posting a series of totally meaningless messages in
a set of totally inappropriate places.  Theater of the absurd.   Okay guys,
we've seen it; I give it a 3 on difficulty and a 4 on creativity.   No
medal, not even honorable mention.  So, wrap up the production, go away...
don't call us, we'll call you.


---

If I was smart, I'd have a clever .sig


From Unknown Tue Nov 21 19:06:15 1995
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From: Cal Eustaquio <[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.policy,rec.radio.amateur.space,rec.radio.cb,rec.radio.noncomm,rec.radio.scanner,rec.radio.swap
Subject: Re: Hams please read ....
Date: Tue, 21 Nov 1995 07:49:12 -0800
Organization: Cal Poly, San Luis Obispo
Lines: 13
Message-ID: <[e-mail]>
References: <48lekf$[e-mail]> <48rbap$[e-mail]>
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Dan:
One meaning may be for "Society for the Presevation of Amplitude
Modulation." Otherwise, its a generic term for a meat product that was
invented during WW2 that is still put out in the market by Hormel (I think).


On 21 Nov 1995, Daniel Calzaretta wrote:

> I'm new to this.  What does "spam" mean?  Is it Italian or Latin for
> something?
>
>
>


From Unknown Tue Nov 21 19:06:16 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.mid.net!tin.monsanto.com!usenet
From: [e-mail]
Newsgroups: rec.radio.shortwave,rec.radio.amateur.homebrew
Subject: Ramsey Shortwave Kit
Date: Tue, 21 Nov 95 09:33:22 PDT
Organization: Monsanto Company
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Hi All:

I have a quick question. How does the Ramsey shortwave
receiver kit stack up as far as sensitivity and
selecttivity compared to MFJ's 8100K. Would the Ramsey Kit
be a nice set to build and listen to?

Gary-



From Unknown Tue Nov 21 19:06:16 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!brighton.openmarket.com!decwrl!purdue!yuma!lamar.ColoState.EDU!not-for-mail
From: [e-mail] (Watts)
Newsgroups: rec.radio.amateur.homebrew
Subject: Tek 604 CRT Display Diagram?
Date: 21 Nov 1995 11:44:49 -0700
Organization: Colorado State University, Fort Collins, CO  80523
Lines: 11
Message-ID: <48t6n1$[e-mail]>
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I have a Tektronics model 603 CRT display unit.  It has a little problem with
with it's -30 volt supply (it's only -25.6 volts, manual sez -30 exactly) and
the manual I have is a poor photocopy, missing some horizontal lines, etc.

Does anyone know where to get a better copy or even a real manual?  I only
need the diagram marked 'Low Voltage Power Supply/Regulators' and is a
schematic of same.  The bottom says (I think): "603/604  Rev H June 1976'.

havin' fun,
galen, KF0YJ


From Unknown Tue Nov 21 19:06:18 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Tech Errors.... Common?
Date: 21 Nov 1995 15:37:38 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 49
Sender: [e-mail]
Message-ID: <48tdai$[e-mail]>
References: <48q1id$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <48q1id$[e-mail]>, Zack Lau <[e-mail]> writes:

>
>I'm still in the process of insuring that I get to spend a few
>hours looking at every article.  In the past, there were some
>that apparently went to press without me getting a good look at,
>especially during the busy conference season when I'm out of the
>office.  Getting rid of those errors is quite a priority at HQ,
>I'm spending a lot more time looking at articles and less time
>writing stuff up.  (I just tested a 2M directional coupler with
>30 dB directivity and realized I designed and etched the circuit
>board back in April).
>
>There is still a posting for an Assistant Technical Editor--paying
>32-35k. We could certainly use an expert on everything to spot those
>technical errors.
>
>Zack [e-mail].

Zack,

Why doesn't the ARRL make use of the FREE technical ability of the
Technical Directors and the amateur population that works in the industry?
That would radically reduce published errors without any cost penalty. HQ
will likely have a difficult time hiring a reliable technical expert for
the salary you listed, when industry pays over twice that amount!

It is much better to have consensus from several independent sources. Sole
sources are almost never reliable for technical data. No single person is
error free or catches every mistake! Only a fool or ego-maniac would
believe otherwise.

Ceratinly *a few* technical errors are simple and stand out, even a single
reliable source could catch those errors. But most technical articles
require  ****GROUPS***** of experienced reviewers, NOT the single source
commonly depended on. The League doesn't need to do the work or even pay
for the help. The staff simply needs to learn how to allow and encourage
people to help. Resources are available if the staff uses them.

QST and the ARRL Handbooks are certainly the most error free Amateur type
publications available. But in my opinion accuracy is slipping. Things
seem to be slowly shifting towards being "just another publishing house"
and away from reliable technical information.

If it really is a priority to get rid of technical errors, GL. I hope egos
don't get in the way.

73,
Tom


From Unknown Tue Nov 21 19:06:19 1995
Path: news.epix.net!news.sprintlink.net!news.clark.net!europa.chnt.gtegsc.com!gatech!newsfeed.internetmci.com!swrinde!sdd.hp.com!vixen.cso.uiuc.edu!usenet.ucs.indiana.edu!news
From: Dan Hughes <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Ramsey Kits..worth the money?
Date: 21 Nov 1995 18:26:43 GMT
Organization: Indiana University
Lines: 8
Message-ID: <48t5l3$[e-mail]>
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I am considering purchasing a Ramsey 20 meter qrp outfit. I was wondering
if anyone out there had any comments on Ramsey and their kits, both good
and bad.

Thanks all,

Dan N9ZTO



From Unknown Tue Nov 21 19:06:20 1995
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.scanner
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!natinst.com!news-relay.us.dell.com!swrinde!sdd.hp.com!hpscit.sc.hp.com!unknown!lkraft
From: [e-mail] (Lyle Kraft)
Subject: Re: Standard 568A recovery?
Sender: [e-mail] (News Administrator)
Message-ID: <[e-mail]>
Date: Tue, 21 Nov 1995 20:28:18 GMT
References: <[e-mail]>
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Xref: news.epix.net rec.radio.amateur.equipment:21590 rec.radio.amateur.homebrew:11675 rec.radio.scanner:40945

Michael Fogarty ([e-mail]) wrote:
: > A new tribander is out from Standard: the 568A.  It receives a surprising
: > array of frequencies, including 800-1300MHz.  Does anyone know of mods
: > for recovering the interesting parts of the 800 realm?  I've checked
: > Oakland and can't get through to AD4HL's BBS (at 615-537-6051).
: >
: > Does anyone have one of these radios?  What do you think?

        Yes,  and the image rejection on the 800-999MHz band is so poor
        that you can receive the "blocked" part of the 800MHz band by
        tuning the radio to  (desired frequency) + 46.1MHz.

: >
: > I'd also like to get a general feeling for what people think about the
: > Standard brand.
: >

        I like it's size (not too big, not too small).  The DTMF encoder
        allows direct entry of digits 0-9,#, and *, but not A,B,C, or D.
        You can program these digits into one of six DTMF sequence memories
        though.

        I've had mine for several months.  Works fine,  but the tiny
        "3-band" antenna supplied doesn't work worth a darn on 2-m.
        And 35mW on 1280 is useful for only the most local 1280
        repeaters (and as a signal source for testing).


: > In the market,
: > Mike

        Regards,
        L
 ==========================================================================
                             Lyle Kraft               AA6LK
 #####################       Hewlett-Packard
 ######  /_  _  ######       System Interconnect Lab -
 #####  / / /_/  #####          Information Networks Division
 ######    /    ######       Roseville, CA 95747-5601
 #####################       916-785-5798  FAX [phone]
                             [e-mail]
 ==========================================================================


From Unknown Sun Nov 26 04:50:41 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!news.mathworks.com!news.kei.com!simtel!news00.sunet.se!sunic!news99.sunet.se!news.kth.se!news
From: Hans Insulander <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,sci.electronics
Subject: [Q] Papers about Microstrips.
Date: 22 Nov 1995 17:20:00 GMT
Organization: Student at College of Engineering
Lines: 6
Message-ID: <48vm40$[e-mail]>
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Hi!

Does anyone know about a FAQ or something about striplines?

/Hans Insulander SM0UTY    [e-mail]



From Unknown Sun Nov 26 04:50:42 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!intac!usenet
From: Bob <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Amp
Date: 25 Nov 1995 14:38:57 GMT
Organization: The Front Room Publishers
Lines: 6
Message-ID: <4979q1$[e-mail]>
References: <492e1b$[e-mail]>
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To: [e-mail]

Save your time and money radioshack has a small amp in a case. It
runs off 9volt battery.

Bob Wa2ihj




From Unknown Sun Nov 26 04:50:43 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: antenna switch reactance
Date: 23 Nov 1995 06:27:17 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 16
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Message-ID: <491lql$[e-mail]>
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In article <[e-mail]>, [e-mail]
(Paul Erickson) writes:

> I'm wondering if I should
>attempt to tune out the reactance in the box or just leave well enough
>alone and simply adjust the tuners to compensate.
>
>Suggestions will be greatly appreciated.
>
>cheers, Paul
>VE7CQK

At HF, readjust the tuners to compensate. At upper VHF or UHF, you've got
a messs.

73 Tom


From Unknown Sun Nov 26 04:50:44 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!eskimo!localhost
From: [e-mail] (Bill Turner)
Subject: Re: antenna switch reactance
X-Nntp-Posting-Host: tia1.eskimo.com
Message-ID: <[e-mail]>
Sender: [e-mail] (News User Id)
Organization: Eskimo North (206) For-Ever
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References: <[e-mail]> <[e-mail]>
Date: Thu, 23 Nov 1995 19:06:31 GMT
Lines: 27

In article <[e-mail]>,
   [e-mail] (Paul Erickson) wrote:
>I am in the process of doing a bit of antenna experamenting and in order
>to make antenna changing easier I built a coax switch in a small metal
>box and some bnc's. Not suprisingly, the box introduces enough reactance
>to effect the tuning of the individual antennas. All the antennas a
>fed with 300ohm twinlead with individual tuners. I'm wondering if I should
>attempt to tune out the reactance in the box or just leave well enough
>alone and simply adjust the tuners to compensate.
>
>Suggestions will be greatly appreciated.
>
>cheers, Paul
>VE7CQK
>email: [e-mail]
>
--------------------------------------------------------
You might try this as a quick and dirty fix:  in my commercially-made antenna
switch box there is a 10pf capacitor from the output connector to ground for
just that purpose.  Your box will need a different value no doubt, so a
variable might be a good choice.  If that doesn't fix it, don't lose a lot of
sleep over it.  Assuming your leads are all fairly short, the amount of
reactance introduced won't matter much.


73, Bill W7LZP
[e-mail]


From Unknown Sun Nov 26 04:50:45 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!news.mathworks.com!news.kei.com!simtel!news00.sunet.se!sunic!news99.sunet.se!news.kth.se!news
From: Hans Insulander <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,sci.electronics
Subject: Building a 1296Mhz VCO - suggestions
Date: 22 Nov 1995 17:17:44 GMT
Organization: Student at College of Engineering
Lines: 13
Message-ID: <48vlvo$[e-mail]>
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Xref: news.epix.net rec.radio.amateur.homebrew:11686 sci.electronics:160051

Hi!

Does anyone have any suggestion on how to build a 1296MHz VCO?
I have about one hundred BB809 varactor diodes. Will they work (good)
for this frequency?
I also have a bunch of MSA-0386 and MSA-0486 MMIC's. Can i use them
for an oscillator?

Thanks for any help!

/Hans Insulander  SM0UTY
 [e-mail]



From Unknown Sun Nov 26 04:50:46 1995
Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!usenet
From: [e-mail] (Pieter Ibelings)
Newsgroups: rec.radio.amateur.homebrew,sci.electronics
Subject: Re: Building a 1296Mhz VCO - suggestions
Date: 26 Nov 1995 02:32:54 GMT
Organization: -.-. --.-     -.. -..-
Lines: 64
Message-ID: <498jkm$[e-mail]>
References: <48vlvo$[e-mail]> <498h3s$[e-mail]>
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Mime-Version: 1.0
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Xref: news.epix.net rec.radio.amateur.homebrew:11735 sci.electronics:160306

In article <498h3s$[e-mail]>, [e-mail] says...
>
>In article <48vlvo$[e-mail]>,
>Hans Insulander  <[e-mail]> wrote:
>>Hi!
>>
>>Does anyone have any suggestion on how to build a 1296MHz VCO?
>>I have about one hundred BB809 varactor diodes. Will they work (good)
>>for this frequency?
>>I also have a bunch of MSA-0386 and MSA-0486 MMIC's. Can i use them
>>for an oscillator?
>>
>>Thanks for any help!
>>
>>/Hans Insulander  SM0UTY
>> [e-mail]


You can also try this: using a MRF901 or similar transistor:
                     +10V
                      |
                      /
                      \  51 ohms
                      /
                      \
      +10V            |
      -               |
      |               |----------||---------RF out
      /          |   /
      \          |  /            100 pf
      / 15k      | /
      \          |/
      |          |
      |----------|
      |          |\
      /          | \
      \          |  \
      / 3.9K     |   \|
      \              |
      |             [ ] small patch about .2 x .2 inch on FR4 Material.
      |              |
     GND             /
                     \
                     / 360 ohms
                     \
                     |
                    GND





Connect the center of an  open piece of semirigid coax of 50 or 75 ohm impedance to the base of the transistor. Make it
about 150 degrees long and ground the shield. Trim the lenght of the coax to oscillate at the desired frequency. To vary the
frequency apply the vco voltage to the base of the transistor using a 20K resistor. This voltage can be a few volts. There
is no varicap required since the s-parameters of the transistor change with base bias. I have used this simple circuit to
transmit FM video using a simple pre-emphasis network in front of it.

73's
Good Luck
AC4OP
Pieter Ibelings




From Unknown Sun Nov 26 04:50:47 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!sdd.hp.com!hpscit.sc.hp.com!rkarlqu
From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew,sci.electronics
Subject: Re: Building a 1296Mhz VCO - suggestions
Date: 26 Nov 1995 01:49:48 GMT
Organization: Hewlett-Packard
Lines: 71
Message-ID: <498h3s$[e-mail]>
References: <48vlvo$[e-mail]>
NNTP-Posting-Host: hpscrj.scd.hp.com
Xref: news.epix.net rec.radio.amateur.homebrew:11738 sci.electronics:160317

In article <48vlvo$[e-mail]>,
Hans Insulander  <[e-mail]> wrote:
>Hi!
>
>Does anyone have any suggestion on how to build a 1296MHz VCO?
>I have about one hundred BB809 varactor diodes. Will they work (good)
>for this frequency?
>I also have a bunch of MSA-0386 and MSA-0486 MMIC's. Can i use them
>for an oscillator?
>
>Thanks for any help!
>
>/Hans Insulander  SM0UTY
> [e-mail]


1.  Get a microwave transistor, such as BFR90
2.  Connect the following bias circuit:


                     +12V
                      |
                      |
                      /
                      \  470 ohms
                      /
                      \
                      |
      ----------------|
      |               |----------||---------RF out
      /          |   /
      \          |  /            2.2 pf
      / 1k       | /
      \          |/
      |          |
      |----------|
      |          |\
      /          | \
      \          |  \
      / 1k       |   \
      \              |
      |              |
      |              |
     -5V            GND

3.  Connect the following from collector to base:

     100 pf      varactor       100 pf

-------||---------||<|-----------||---------
            |              |
            |              |
            /              /
            \              \
            / 10K          /  10K
            \              \
            |              |
            |              |

              tuning voltage


If the frequency of oscillation is too low, shorten
the leads on the tuning network.  If it is too high,
lengthen them.  The tuning diode resonates with stray
inductance.  It is fairly easy to get this to tune
from say 1 to 2 GHz.


Rick Karlquist N6RK
[e-mail]


From Unknown Sun Nov 26 04:50:48 1995
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!lamarck.sura.net!news.uky.edu!news
From: [e-mail] (Terry Fugate)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Chassis punch for Octal Socket
Date: 21 Nov 1995 13:46:59 GMT
Organization: IT
Lines: 37
Message-ID: <48sl8j$[e-mail]>
References: <48rhji$[e-mail]>
NNTP-Posting-Host: 128.163.13.56
X-Newsreader: WinVN 0.92.6

In article <48rhji$[e-mail]>, [e-mail] (Jeffrey Hill) says:
>
>I'm upgrading the final amp in my Swan 270B to a 6146B from a 6LQ6. I got
>a nice tube from Red China and a ceramic octal socket and went at it
>soldering iron a-smokin'.
>
>The reason for this project is that 6LQ6's go for $42 each, when you can
>find them but Commie 6146B's go for $12. Also the 6146B has 20% more
>plate dissipation, which is dearly needed in this design.
>
>What I did not foresee is that the original hole for the 9-pin socket is
>too small to accomodate the octal socket. I don't want to use a crude
>method to modify the chassis so I am hoping to find a kindly ham who will
>lend the proper tool for this job. I will bear all expenses and pay a
>small fee to such an individual.
>
>Thank you-  AC4AQ
>
>
>
>PS I know the heater current is different- thanks.
I loaned or lost my octal punch long ago, you might have better luck
tracking down a local electrician.  Most of them have a good
array of punches(the more inovative will have hydrolic(sp) punches)
and will shouldn't charge too much to punch it.  I bet if you
check on the air, you even have some hams locally who are
electricians.
Just a thought.
.............................................................................
Terry Fugate
UKTV
University of Kentucky
"The opinions expressed herein are mine, and soley mine.  They do not
represent the official view of the University of Kentucky,
the State of Kentucky, or any agency of any government.
If you do not like my opinion, just get on with your life.
I will not change your mind and you damn sure can not change mine."


From Unknown Sun Nov 26 04:50:49 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!usenet.eel.ufl.edu!newsfeed.internetmci.com!in1.uu.net!pipeline!psinntp!psinntp!psinntp!atl.com!ldesot
From: [e-mail] (Larry DeSoto)
Subject: Re: Chassis punch for Octal Socket
Message-ID: <[e-mail]>
Sender: [e-mail]
Nntp-Posting-Host: atl.com
Organization: Advanced Technology Laboratories
References: <48sl8j$[e-mail]> <49474h$[e-mail]>
Date: Fri, 24 Nov 1995 18:31:28 GMT
Lines: 33

In article <49474h$[e-mail]>, [e-mail] (W8JI  Tom) writes:
> In article <48sl8j$[e-mail]>, [e-mail] (Terry
> Fugate) writes:
>
> >>
> >>What I did not foresee is that the original hole for the 9-pin socket is
>
> >>too small to accomodate the octal socket. I don't want to use a crude
> >>method to modify the chassis so I am hoping to find a kindly ham who
> will
> >>lend the proper tool for this job. I will bear all expenses and pay a
> >>small fee to such an individual.
> >>
> >>Thank you-  AC4AQ
>
> Where are you at? I have a complete set near Atlanta.
>
> I've done similar changes in my T4XC, the neutralizing circuit and grid
> capacitance needs modification, as well as bias system. Funny, in my Drake
> the sockets bolted right in, but then they were American made!


I'd be really interested in knowing just what changes you made to your
T4XC.  I have a pair of the old Drake twins though the transmitter is the
T4X.  I wouldn't mind converting it to 6146 finals.


--
Larry WA5MLH                          *************************
                                      *                       *
                                      *  Speaking for myself  *
                                      *                       *
                                      *************************


From Unknown Sun Nov 26 04:50:50 1995
Path: news.epix.net!news.sprintlink.net!druid.borland.com!ico.net!pacbell.com!nntp-hub2.barrnet.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (N2MCS)
Newsgroups: rec.radio.amateur.homebrew
Subject: Code practice oscillator?
Date: 24 Nov 1995 00:23:38 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 24
Sender: [e-mail]
Message-ID: <493ksq$[e-mail]>
Reply-To: [e-mail] (N2MCS)
NNTP-Posting-Host: newsbf02.mail.aol.com

    Hello.  I am going to attempt to design a keyer (based on one of the
curtis
ICs) with a built in code practive oscillator.  The keyer is rather
simple, as I have
the information I need.
     However, I don't know how to go about building the oscillator.
Someone
mentioned to me that I could build a simple osc. using a 555 timer IC.  I
can
imagine how this is possible, but can't seem to figure out the details.  I
want a
reliable osc. with variable pitch.  The audio amp part I can handle (yet
another
IC)  I prefer an IC approach because it tends to look nicer (I like to
show off my
work, who doesn't?) But if you have a simple and reliable design with
other methods, I am all ears!

Thanks for everyones help in advance.

Chris N2MCS
[e-mail]

ps (I prefer email responses, but followup posts are OK :-) )


From Unknown Sun Nov 26 04:50:51 1995
Path: news.epix.net!news.sprintlink.net!news.scott.net!acara.snsnet.net!HiWAAY.net!imci2!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Jim Stafford-W4QO)
Newsgroups: rec.radio.amateur.homebrew
Subject: Crystals (fwd)
Date: 21 Nov 95 16:16:56 GMT
Organization: ucsd usenet gateway
Lines: 20
Message-ID: <Pine.SV4.3.91.951121111550.9230H-100000@atl1>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

Tried sending a reply to originator but get back an "undeliverable"
report from inhp4.ucsd.edu, so will send to the list and hope Sandy gets it.

73/72/jim/w4qo

---------- Forwarded message ----------
Date: Tue, 21 Nov 1995 11:08:30 -0500 (EST)
From: Jim Stafford-W4QO <[e-mail]>
To: [e-mail]
Subject: Crystals

Check back of QST and write to CW Crytals per their classified ad.  He
still makes ft-243 crystals at about $4 apiece and you get to specify
what you want.  I have had very good luck with his service altho he is a
bit slow.  I suspect he makes them in his basement!  If you have trouble
getting address, I can dig around and look him up for you.

73/72/jim/w4qo




From Unknown Sun Nov 26 04:50:52 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (tom medin)
Newsgroups: rec.radio.amateur.homebrew
Subject: CW filter in LSB on FT-890
Date: 21 Nov 95 22:25:26 GMT
Organization: ucsd usenet gateway
Lines: 6
Message-ID: <[e-mail]>
Reply-To: <[e-mail]>
NNTP-Posting-Host: ucsd.edu
Originator: [e-mail]

anybody have any idea how i can logically switch in the CW filter when
i am in LSB on the Yaesu FT-890?


t medin
n0ufm


From Unknown Sun Nov 26 04:50:53 1995
Path: news.epix.net!news.sprintlink.net!news.heurikon.com!uwvax!uwm.edu!cs.utexas.edu!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!vivanews.vivanet.com!mulveyr
From: [e-mail] (Rich Mulvey)
Newsgroups: radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.policy,rec.radio.amateur.space
Subject: Re: Even my wife thinks hams are...
Followup-To: radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.policy,rec.radio.amateur.space
Date: 24 Nov 1995 18:22:32 GMT
Organization: Mulvey Home Node
Lines: 11
Message-ID: <4952h8$[e-mail]>
References: <[e-mail]> <47uhb8$[e-mail]> <481qu5$[e-mail]> <4825eh$[e-mail]> <485m5d$[e-mail]> <485q5e$[e-mail]> <48fo6h$[e-mail]> <48j44a$[e-mail]> <48mc8e$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ip225.vivanet.com
X-Newsreader: TIN [version 1.2 PL2]
Xref: news.epix.net rec.radio.amateur.digital.misc:12773 rec.radio.amateur.equipment:21681 rec.radio.amateur.homebrew:11719 rec.radio.amateur.policy:32017 rec.radio.amateur.space:5816

Dennis A. Mason (damason) wrote:
: Burt must be a Chicken Bander.

Please, we don't appreciate fowl language here.


---
Rich Mulvey, aa2ys                                        Rochester, NY   USA
[e-mail]
[e-mail]
aa2ys@wb2psi.#wny.ny.us


From Unknown Sun Nov 26 04:50:54 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!psgrain!iafrica.com!ticsa.com!cstatd.cstat.co.za!slipper124245.iafrica.com!lukes
From: [e-mail] (Vivesco cc)
Newsgroups: rec.radio.amateur.homebrew
Subject: Ferrite antennas in Pager receivers
Date: Wed, 22 Nov 1995 06:23:08
Organization: Internet Africa
Lines: 13
Message-ID: <[e-mail]>
NNTP-Posting-Host: slipper124245.iafrica.com
X-Newsreader: Trumpet for Windows [Version 1.0 Rev A]

I would like to use a ferrite antenna similar to that used in pager receivers.

Can anyone please help me with:

1.  Who manufactures the antennas?
2.  Where can I get information on how to design such an antenna?

They seem to be in wide use in pagers.

Thank you

Lucas Gertenbach
[e-mail]


From Unknown Sun Nov 26 04:50:55 1995
Path: news.epix.net!news.sprintlink.net!hookup!newsfeed.internetmci.com!news.kei.com!simtel!col.hp.com!news.dtc.hp.com!hpscit.sc.hp.com!rkarlqu
From: [e-mail] (Richard Karlquist)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: frequency standard using GPS?
Date: 22 Nov 1995 03:10:45 GMT
Organization: Hewlett-Packard
Lines: 60
Message-ID: <48u4bl$[e-mail]>
References: <48ij9i$[e-mail]> <48pp9m$[e-mail]>
NNTP-Posting-Host: hpscrj.scd.hp.com

In article <48pp9m$[e-mail]>, Joanne Dow <[e-mail]> wrote:
>In article <48ij9i$[e-mail]>, [e-mail] () wrote:
>>Hi,
>>
>>I'm in need of a good frequency standard at 10 MHz for my counter.
>>
>>Does anybody know articles / equipment / diagrams etc to do this with
>>a GPS receiver ? Is it usable for this purpose ?
>
>Most are not.  Usually there is only a software phaselocked loop with an

Most are not suitable because they don't have 1 pulse per second (1 PPS) outputs.
However, 1 PPS outputs are available.  For example, the Motorola Oncore
engine has 1 PPS as an extra cost option.

>oscillator in the receiver of at best TCXO accuracy levels.  Therefore there is
>no handy frequency available to tap off a real 10.23MHz signal.

You don't need to tap off a 10.23 MHz. signal.   What you do is phase lock
a crystal oscillator to the 1PPS signal by dividing the oscillator signal
down to 1 Hz. and comparing to the 1PPS signal.  The accuracy you get is
dependent on how stable your oscillator is, what the time constant of the
phase locked loop is, and the resolution of your phase detector.

In the Hewlett-Packard GPS timing receiver we make at this division, we
approach an accuracy of 1 part in 10^12 for 1 day averaging.

If you just want to check the accuracy of your counter, simply measure
the period of the 1 PPS output with averaging turned on.  You can adjust your
counter's timebase until it reads exactly 1 second.

>All the satellites are on slightly different frequencies as they reach the
>receiver due to Doppler shift.  Hence the PLL is necessary anyway.  So aside
>from making acquisition faster there is little or no need for a very accurate
>clock in a GPS receiver even though GPS can be used as a source for a time
>standard.  (And I think there is at least one company making a standard
>stabilized by a custom GPS receiver.)

Yes, a fellow from here left and started a company to do that.
Theoretically, it should be better.
The jury is still out on the merits of that architecture.

>
>If your local TV station uses modern practice and stabilizes their color
>subcarrier with a rubidium or cesium standard you can get quite accurate results

That "modern" practice was discontinued at least 10 years ago.

>>73 Joop, pe1dna
>>[e-mail]
>>PE1DNA @ PI8ZAA.#NBO.NLD.EU
>>
>
>{^_^}     Joanne Dow     The Wizardess
>



Rick Karlquist N6RK
[e-mail]


From Unknown Sun Nov 26 04:50:56 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!nntp.crl.com!crl11.crl.com!not-for-mail
From: [e-mail] (Peter Gerba)
Newsgroups: rec.radio.amateur.homebrew
Subject: FS HP 477B Thermistor Mounts
Date: 24 Nov 1995 15:17:12 -0800
Organization: CRL Dialup Internet Access        [phone]  [Login: guest]
Lines: 6
Message-ID: <495jpo$[e-mail]>
NNTP-Posting-Host: crl11.crl.com
X-Newsreader: TIN [version 1.2 PL2]

I have a few HP 477B bolometers.  These fit the 430, and I think will work
on the 430C, HP Power Meters.  Tested, $ 35 ea incl shipping in the lower 48.

pete
[e-mail]



From Unknown Sun Nov 26 04:50:57 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!simtel!torn!ccshst05.cs.uoguelph.ca!ccshst01.cs.uoguelph.ca!davidole
From: [e-mail] (David O'Leary)
Newsgroups: rec.radio.amateur.homebrew
Subject: Icom Modification...
Date: 22 Nov 1995 00:45:27 GMT
Organization: University of Guelph
Lines: 15
Message-ID: <48trr7$[e-mail]>
NNTP-Posting-Host: ccshst01.cs.uoguelph.ca
X-Newsreader: TIN [version 1.2 PL2]


Greetings all,

A quick question.... I have an older Icom HT, whose exact model I cannot
remember right now.  I really don't need it for use on 2m 144 MHz + that
it is set for.  Is there any way to take a full 100 MHz off of this unit
and still have it work?  Could it be modified to transmit in the 44+ MHz
range or will and such modification completely destroy the transmit
ability of the radio.....

Just thinking about the possibility of this sort of thing.....  Any
advice would be most appreciated.....

Dave O'Leary
VE3TZV


From Unknown Sun Nov 26 04:50:58 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!news.cybercomm.net!usenet
From: Stephan Rashkin <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Looking for modulation transformer
Date: 25 Nov 1995 20:55:01 GMT
Organization: CyberComm Online Services
Lines: 11
Message-ID: <497vr5$[e-mail]>
NNTP-Posting-Host: sl-019.sl.cybercomm.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)

I'm looking for a modulation transformer with a 4000 ohm secondary that
will handle about 200 ma and 25 watts to plate modulate an old Johnson
Viking Adventurer..


Zm=Ep/Ip x 1000 ohms

Anyone know of any source other than hamfests?

Steve, Wa2nhz



From Unknown Sun Nov 26 04:50:59 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Jeff Anderson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Measuring phase-noise with HP 8640B
Date: 25 Nov 1995 02:20:56 GMT
Organization: Netcom
Lines: 45
Message-ID: <495ui8$[e-mail]>
NNTP-Posting-Host: ix-pa3-11.ix.netcom.com
X-NETCOM-Date: Fri Nov 24  6:20:56 PM PST 1995


I was just skimming the Handbook and came across an interesting article
discussing oscillator phase-noise, and a simple technique for measuring
it by phase-locking an HP-8640B generator to the oscillator signal.

Unfortunately, it was more of a summary of the technique than a
detailed descripton.  I have an 8640B, but it's the militarized option
323 version, and so lacks several of the standard version's features.
As anyone tried this technique?  I have several questions about it and
the "useability" of the option 323 version generator for this
application.

    Question 1:  Although the 8640B has a "lock" feature that allows
    it to lock to it's internal reference, the option 323 lacks this
    feature.  Is it needed for this application?  I'd think not, since,
    in this application, the generator is being locked to the
    oscillator using an external phase detector (mixer) and low-pass
    filter, the output of which is applied to the external FM
    input.  I can't see any reason why I'd simultaneously need to
    lock to the internal reference.  However, there may be a good
    reason.  As anyone tried this with the lock ON, and with it OFF?
    Any differences in measurement?

    Question 2:  I think the article mentioned that the filter
    was a 1 MHz low-pass.  How many poles should it be?  Is
    shape important, or can I get by with a simple topology
    (like, say, an RC lowpass)?

    Question 3:  Any harm in using the generator's external sync
    output (basically a square wave, rather than a nice sine) to
    drive the mixer?  Again, I'd think not, but an experiment
    might be in order.

Does anyone know more about this technique?  I've got all the equipment
here (including an ancient HP 3591A Selective Voltmeter, which ought to
give me some interesting plots on my equally old 7035B XY Plotter).

Also, is anyone familiar with the circuitry of the 8640B?  I'd like to
find out what the actual differences are  - perhaps I can make a mod to
give me the lock feature, if required.   I've sketched out some ideas,
but knowing what HP really did would help...

Thanks!

- Jeff, WA6AHL


From Unknown Sun Nov 26 04:51:00 1995
Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!olivea!spool.mu.edu!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!vivanews.vivanet.com!mulveyr
From: [e-mail] (Rich Mulvey)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need Help  - Parallel!
Date: 23 Nov 1995 03:10:30 GMT
Organization: Mulvey Home Node
Lines: 26
Message-ID: <490on6$[e-mail]>
References: <48dq7b$[e-mail]> <48lf1c$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ip222.vivanet.com
X-Newsreader: TIN [version 1.2 PL2]

The2X4 ([e-mail]) wrote:
: In article <48dq7b$[e-mail]>, [e-mail] (Thom)
: writes:

: >
: >For example I'm presently building a keyer which call for a 91K resitor.
: >I have a 100K resistor, so how do I (in a simple manor) determine what
: >value to put across the 100K?  (Now in reality I'll wind going with the
: >100K as close enough, but that's cheating).
: >
: >

: Hi
: Why not pur a 68K and a 22K in series. 90K should work.
: You might even get closer by testing the value of several.

   Hmmm... that famous Curtis Keyer 91K resistor.  :-)

   Use 100K.  It works just fine - you'll never know the difference.


---
Rich Mulvey, aa2ys                                        Rochester, NY   USA
[e-mail]
[e-mail]
aa2ys@wb2psi.#wny.ny.us


From Unknown Sun Nov 26 04:51:01 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!gatech!newsfeed.internetmci.com!delmarva.com!udel!stimpy.eecis.udel.edu!hanavin
From: [e-mail] (Chuck Hanavin)
Newsgroups: rec.radio.amateur.homebrew
Subject: Oil Filled Caps
Date: 22 Nov 1995 18:13:35 GMT
Organization: University of Delaware, Newark
Lines: 15
Message-ID: <48vp8f$[e-mail]>
NNTP-Posting-Host: stimpy1.eecis.udel.edu

What's the story on oil filled capacitors ? Are they
all alike?  I remember years ago, someone telling me about
some caps that looked like oil filled, had high capacitance
and high voltage ratings, but were unsuitable for power
supply filtering. I think they were used with some-kind of
photographer set up.

The reason I ask, fair radio has, what they call, Energy
storage capacitors, 32UF @ 4500v. I was thinking about
buying a couple for my next transmitter project. Any reason
why they wouldn't work as a high voltage filter cap?

Thanks for any info

Chuck (WB3FJJ)


From Unknown Sun Nov 26 04:51:04 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!btnet!zetnet.co.uk!demon!mail2news.demon.co.uk!ifwtech.demon.co.uk
From: Ian G3SEK <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Oil Filled Caps
Date: Wed, 22 Nov 1995 22:32:17 +0000
Organization: IFWtech
Lines: 32
Message-ID: <[e-mail]>
References: <48vp8f$[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: ifwtech.demon.co.uk
X-Newsreader: Newswin Alpha 0.9.1
X-SMTP-Posting-Host: ifwtech.demon.co.uk [Wed, 22 Nov 95 22:48:21 GMT]
X-SMTP-Posting-Host: post.demon.co.uk [Wed, 22 Nov 95 22:49:36 GMT]

In article: <48vp8f$[e-mail]>  [e-mail]
(Chuck Hanavin) writes:
:
: What's the story on oil filled capacitors ? Are they
: all alike?  I remember years ago, someone telling me about
: some caps that looked like oil filled, had high capacitance
: and high voltage ratings, but were unsuitable for power
: supply filtering. I think they were used with some-kind of
: photographer set up.

Photoflash, that would have been, and the dielectric is probably some kind
of plastic rather than oil-soaked paper.

:
: The reason I ask, fair radio has, what they call, Energy
: storage capacitors, 32UF @ 4500v. I was thinking about
: buying a couple for my next transmitter project. Any reason
: why they wouldn't work as a high voltage filter cap?

Obviously I can't speak for these particular components, but I've tried two
photoflash energy storage caps and each one went dead-short after a few
years (followed by a chorus of "We told you so!" from GW4FRX and other
friends).


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



From Unknown Sun Nov 26 04:51:04 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Oil Filled Caps
Date: 25 Nov 1995 08:06:13 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 14
Sender: [e-mail]
Message-ID: <4974c5$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

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

>Obviously I can't speak for these particular components, but I've tried
two
>photoflash energy storage caps and each one went dead-short after a few
>years (followed by a chorus of "We told you so!" from GW4FRX and other
>friends).

What brand were they?  Did they say "photoflash"? I've use the energy
storage types for years now, but then our power lines are superior (read
that with an icy snobby tone ;-) ) since we do use 60 Hz here.

73 Tom


From Unknown Sun Nov 26 04:51:05 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!EU.net!peer-news.britain.eu.net!demon!mail2news.demon.co.uk!ifwtech.demon.co.uk
From: Ian G3SEK <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Oil Filled Caps
Date: Sat, 25 Nov 1995 18:40:39 +0000
Organization: IFWtech
Lines: 46
Message-ID: <[e-mail]>
References: <[e-mail]> <4974c5$[e-mail]>
Reply-To: [e-mail]
X-NNTP-Posting-Host: ifwtech.demon.co.uk
X-Newsreader: Newswin Alpha 0.9.1
X-SMTP-Posting-Host: ifwtech.demon.co.uk [Sun, 26 Nov 95 7:36:30 GMT]
X-SMTP-Posting-Host: post.demon.co.uk [Sun, 26 Nov 95 7:39:05 GMT]

In article: <4974c5$[e-mail]>  [e-mail] (W8JI  Tom)
writes:
:
: In article <[e-mail]>, Ian G3SEK
: <[e-mail]> writes:
:
: >Obviously I can't speak for these particular components, but I've tried
: two
: >photoflash energy storage caps and each one went dead-short after a few
: >years (followed by a chorus of "We told you so!" from GW4FRX and other
: >friends).
:
: What brand were they?  Did they say "photoflash"? I've use the energy
: storage types for years now, but then our power lines are superior (read
: that with an icy snobby tone ;-) ) since we do use 60 Hz here.

The capacitors didn't say "photoflash", but the guy at Dubilier who
designed them did.

He didn't have a specific ripple-current rating for them, because they
weren't designed for smoothing applications, but he did calculate a
rating based on tan-delta (which he did have) and the case size. On that
basis the ripple-current rating was very adequate. Unfortunately this phone
conversation was before they started to die in transmitter PSUs, and he
wasn't available for comment afterwards :-)

There was obviously some kind of very slowly-acting deterioration, because
they worked fine for well over a year. This included heavy use in VHF
contests and EME (2.5-minute CQ calls!). For both of my caps, the end came
when they were not under any special stress, except for the off-load
voltage which was well within the marked ratings. One of them died just
after switching on from cold. Both of them failed dead-short.

Dunno why...  but if they'd been operating on 60Hz, instead of 50Hz as
Nature clearly intends, I reckon they'd only have lasted 50/60ths as long.

What makes of photoflash capacitors have you been using successfully, Tom?


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



From Unknown Sun Nov 26 04:51:07 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (michael silva)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Panel Mount Air Variable Capacitors
Date: 25 Nov 1995 00:18:18 GMT
Organization: Netcom
Lines: 16
Message-ID: <495nca$[e-mail]>
References: <48pvct$[e-mail]> <48te37$[e-mail]>
NNTP-Posting-Host: ix-val-ca2-02.ix.netcom.com
X-NETCOM-Date: Fri Nov 24  4:18:18 PM PST 1995

In <48te37$[e-mail]> [e-mail] (D W
Hemphill KC5NG) writes:
>
>I have a bunch of them in my junkbox, but I have no idea what
>any of their values are, as most are unmarked.  If you have a
>way to measure them, I'll trade them to you for other parts,
>to be determined (I'm always needing something or other).

Hey, *until* you get your LCR meter or dip meter (Christmas is
coming!), I've found that about 10pf per plate pair is a reasonable
figure for many caps.  Caps with big plates and small spacing, like BC
receiver tuning caps, are more like 30pf per plate pair.

73,
Mike, KK6GM



From Unknown Sun Nov 26 04:51:08 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!sdd.hp.com!usc!math.ohio-state.edu!cis.ohio-state.edu!nntp.sei.cmu.edu!bb3.andrew.cmu.edu!casaba.srv.cs.cmu.edu!fore.com!not-for-mail
From: [e-mail] (Ed Bathgate)
Newsgroups: rec.radio.amateur.homebrew
Subject: PC & SOUNDBLASTER AS ECHO REPEATER
Date: 22 Nov 1995 13:51:52 -0500
Organization: FORE Systems, Inc.
Lines: 19
Message-ID: <48vrg8$[e-mail]>
NNTP-Posting-Host: baleen.fore.com



I saw an article on how to build an "Echo Repeater" using voice message
chips, and want to experiment with such a thing and wonder if anybody has
put together any software that performs such a function through a soundblaster.

It doesent seem like a hard thing to do.

Listen for input, store input, when input ends, play back input, beep, and
ID every 10 minutes.

I expect its been done already, where can I ftp the code from?

73

Ed N3SDO

[e-mail]



From Unknown Sun Nov 26 04:51:09 1995
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!usenet.seri.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!lamarck.sura.net!news.uky.edu!news
From: [e-mail] (Terry Fugate)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Photoreceptors for Flying Spot Scanner
Date: 21 Nov 1995 13:39:52 GMT
Organization: IT
Lines: 67
Message-ID: <48skr8$[e-mail]>
References: <48m8od$[e-mail]>
NNTP-Posting-Host: 128.163.13.56
X-Newsreader: WinVN 0.92.6

In article <48m8od$[e-mail]>, [e-mail] (Steve Muther) says:
>
>
>What?  A flying spot scanner in today's world!
>
>I was thinking of what I should do with a couple of surplus
>video camera viewfinders (about a 1 inch video monitor) in my
>junk pile when it occured to me that they might make an
>interesting flying spot scanner for viewing or transmitting
>slides on ATV.
>
>In the old days, they used photomultiplier tubes for the
>receptor element.  I have not done much work with solid state
>photo sensitive devices so I was wondering what might work
>best.  I am looking at cds cells, photovoltaics, photo transistors
>and diodes etc.  I do not have a good understanding of which
>might be best in terms of response time, linearity etc. and
>was wondering if anyone had any suggestions.  Is there a
>device I have overlooked?
>
>I was thinking of 3 devices with RGB filters and one of the
>many RGB encoder chips to do most of the processing.  I will
>get synch from my ATV camera or test generator to form the
>raster on the CRT. That will make for nice, in phase, switching
>between video sources.
>
>Thanks in advance.
>
>Steve Muther  WF6R

Back 25 years ago while ain school, we had some "BK" flying spot
scanners that we used to set up TVs.  They used "slides" about 4"
square.  Any modern photransistor should work. What will "kill"
the project is the phospher decay time.  The BK scanners had a
purple phospher, I called the comapnay to find out why(inquiring
minds and all), and was told that that phospher(and I can not for
love nor money remember the P#) had almost no decay time.  This was
to prevent any residual(sp) light from messing up the image.
A standard TV crt has a moderate decay, this will fill in any
black areas.  It seems that you could use a P7 scope tube(yea I know
how difficult it is to get sweep voltages high enouge to operate
an electrostatic sweep, current is easier to get these days
than voltage) and a filter to remove the long persitance glow.
I think the fast phospher in a p7 is purple(maybe the same right) and
the long persitance phospher was greenish/yellow.(it has be at least
20 years since I last played with p7 crts for wefax/sstv)
I would be more tempted to just get a "cheap" camera(either bw ccd, or
find a modern camcorder with a color ccd pickup) and go that route.
It would be cheaper, faster and probably work better.
I am a TV engineer at the University of Kentucky and I have trouble
excited about ATV.  I can reach the whole US woht about 50 watts...
into our 6.1mtr Ku uplink.  I feel kind of sorry for some of our local
atv'ers, they run 75-100watts and get about 10-15miles(in the winter,
after the 440 eating trees lose their leaves that increases somewhat).
Good luck
Terry WN4ISX


.............................................................................
Terry Fugate
UKTV
University of Kentucky
"The opinions expressed herein are mine, and soley mine.  They do not
represent the official view of the University of Kentucky,
the State of Kentucky, or any agency of any government.
If you do not like my opinion, just get on with your life.
I will not change your mind and you damn sure can not change mine."


From Unknown Sun Nov 26 04:51:10 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!bloom-beacon.mit.edu!senator-bedfellow.mit.edu!candea
From: [e-mail] (George Mihai Candea)
Newsgroups: rec.radio.amateur.misc,rec.radio.cb,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,alt.radio.uk,aus.radio.amateur.misc
Subject: Pioneer KE-A530 question
Date: 23 Nov 1995 21:31:27 GMT
Organization: Massachvsetts Institvte of Technology
Lines: 26
Sender: [e-mail]
Message-ID: <492p7f$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: the-good.mit.edu
Xref: news.epix.net rec.radio.amateur.misc:94630 rec.radio.cb:24593 rec.radio.amateur.digital.misc:12754 rec.radio.amateur.equipment:21656 rec.radio.amateur.homebrew:11710 alt.radio.uk:5043 aus.radio.amateur.misc:262

I apologize if I am posting this to the wrong newsgroup but I am in desperate
need of advice. I have a Pioneer KE-A530 car radio + cassette that my friend
removed from his car a while ago. I am not sure which wires go where because I
don't have the manual anymore and there is no indication on the radio as to
what each wire is. I would appreciate if any of you could tell how to make the
connections (i.e. which is PWR, GND, speakers, etc.).

The wires are in three "bunches":

        Bunch 1:        blue
                        black

        Bunch 2:        green/black (2 wires)
                        gray/black (2 wires)

        Bunch 3:        black (this is definitely a GND -- connected to case)
                        red (has a 0.5 Amp fuse on it and a little box)
                        yellow
                        orange (this must be PWR -- it has a 0.5 Amp fuse)


I really appreciate your help. I reply to my personal e-mail address, as
I do not read this newsgroup regularly.

Thank you,



From Unknown Sun Nov 26 04:51:11 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!bloom-beacon.mit.edu!senator-bedfellow.mit.edu!candea
From: [e-mail] (George Mihai Candea)
Newsgroups: rec.radio.amateur.misc,rec.radio.cb,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,alt.radio.uk,aus.radio.amateur.misc
Subject: Re: Pioneer KE-A530 question
Date: 23 Nov 1995 21:37:17 GMT
Organization: Massachvsetts Institvte of Technology
Lines: 8
Message-ID: <492pid$[e-mail]>
References: <492p7f$[e-mail]>
NNTP-Posting-Host: the-good.mit.edu
Xref: news.epix.net rec.radio.amateur.misc:94631 rec.radio.cb:24594 rec.radio.amateur.digital.misc:12755 rec.radio.amateur.equipment:21657 rec.radio.amateur.homebrew:11711 alt.radio.uk:5044 aus.radio.amateur.misc:263



Sorry for the last paragraph... I meant I would appreciate if you
replied to my personal e-mail address, as I do not read this newsgroup
regularly.

Thanks a lot,



From Unknown Sun Nov 26 04:51:13 1995
Path: news.epix.net!news.sprintlink.net!news.packet.net!news.combase.com!imci3!news.internetMCI.com!newsfeed.internetmci.com!swrinde!cs.utexas.edu!news.ti.com!usenet
From: [e-mail] (J.Fitter   BV/N0IAT)
Newsgroups: rec.radio.amateur.misc,rec.radio.cb,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,alt.radio.uk,aus.radio.amateur.misc
Subject: Re: Pioneer KE-A530 question
Date: 24 Nov 1995 06:21:54 GMT
Organization: Taipei, TAIWAN R.O.C
Lines: 57
Message-ID: <493oa2$[e-mail]>
References: <492p7f$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: 137.167.36.115
Mime-Version: 1.0
X-Newsreader: WinVN 0.99.2
Xref: news.epix.net rec.radio.amateur.misc:94640 rec.radio.cb:24606 rec.radio.amateur.digital.misc:12767 rec.radio.amateur.equipment:21673 rec.radio.amateur.homebrew:11717 alt.radio.uk:5046 aus.radio.amateur.misc:265

In article <492p7f$[e-mail]>, [e-mail] says...
>
>I apologize if I am posting this to the wrong newsgroup but I am in desperate
>need of advice. I have a Pioneer KE-A530 car radio + cassette that my friend
>removed from his car a while ago. I am not sure which wires go where because I
>don't have the manual anymore and there is no indication on the radio as to
>what each wire is. I would appreciate if any of you could tell how to make the
>connections (i.e. which is PWR, GND, speakers, etc.).
>
>The wires are in three "bunches":
>
>        Bunch 1:        blue
>                        black
>
>        Bunch 2:        green/black (2 wires)
>                        gray/black (2 wires)
>
>        Bunch 3:        black (this is definitely a GND -- connected to case)
>                        red (has a 0.5 Amp fuse on it and a little box)
>                        yellow
>                        orange (this must be PWR -- it has a 0.5 Amp fuse)
>
>
>I really appreciate your help. I reply to my personal e-mail address, as
>I do not read this newsgroup regularly.
>
>Thank you,
>

I'll try, but dont blame me if it blows up!!!.  Ok...start with bunch 3.  The black
wire goes to battery negative terminal, or chassis ground.  The red wire with fuse
holder and box (noise filter, likely) goes to ignition ACC ON. T The yellow wire is
used if you want to send a signal to an auto amplifier (external power amp,
subwoofer, etc) or a power up/down automatic retractable antenna.  The orange wire
might be to control a clock if the radio has a clock built in. Orange wire would then
go to the battery and the red wire would go to the acc side of the ignition switch.
Then, when you turn the car -on-, the radio works.  Otherwise, when the car is off,
the only power received by the stereo is on the orange wire and the only operating
function is the clock.  Only when the car is -on- does the radio/tape actually work.

bunch 1 :  blue/black...bunch 1.  not sure, possibly line in for an equalizer.

Bunch 2:  most likely, this is left channel positive and negative (to speaker left)
          most likely, this is right channel positive and negative (speaker right)


Without trying it, it's hard to say.   Does the radio have a "fader" for
front-and-back speakers, or is it only a 2 channel output (left and right but no
front and back)???

Keep your posts here...someone can probably help ya.

--
73 from Joe BV2/N0IAT  Taipei, Taiwan R.O.C.
Ex. 7J1AOF(Japan) KA0ZDH(novice) YU3/N0IAT(Slovenia)
Licensed Radio Amateur since 1986 //comments are mine only



From Unknown Sun Nov 26 04:51:14 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!tank.news.pipex.net!pipex!demon!spacemen.demon.co.uk!davidj
From: David Atkins <[e-mail]>
Newsgroups: rec.radio.amateur.misc,rec.radio.cb,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,alt.radio.uk,aus.radio.amateur.misc
Subject: Re: Pioneer KE-A530 question
Date: Fri, 24 Nov 1995 18:33:19 +0000
Organization: Space Planning Consultants
Lines: 16
Distribution: world
Message-ID: <6BQ9jAAv$[e-mail]>
References: <492p7f$[e-mail]>
NNTP-Posting-Host: spacemen.demon.co.uk
X-NNTP-Posting-Host: spacemen.demon.co.uk
MIME-Version: 1.0
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In article <492p7f$[e-mail]>, George Mihai Candea
<[e-mail]> writes
>I apologize if I am posting this to the wrong newsgroup but I am in desperate
>need of advice. I have a Pioneer KE-A530 car radio + cassette that my friend
>removed from his car a while ago. I am not sure which wires go where because I
>don't have the manual anymore and there is no indication on the radio as to
>what each wire is. I would appreciate if any of you could tell how to make the
>connections (i.e. which is PWR, GND, speakers, etc.).
>
yeah, some bugger nicked the one from my car, too!

--

David Atkins                                    |Office Space is a vital part
Ergonomist                                      |of your Business Strategy


From Unknown Sun Nov 26 04:51:15 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!news-feed.mci.newscorp.com!news.delphi.com!rhiii
From: [e-mail] (Richard Harrison)
Newsgroups: rec.radio.amateur.homebrew
Subject: Plate Choke - Where can I find ?
Date: 25 Nov 1995 20:27:57 GMT
Organization: Delphi Internet Services Corporation
Lines: 13
Message-ID: <[e-mail]>
NNTP-Posting-Host: bos1g.delphi.com
X-To: Richard Harrison <[e-mail]>

Hello Helpful Person:


     Got from flea market an Amp Supply Co. model LA-1000, 80-15 meter
amplifier.  It has a zapped plate choke and probably soft tubes.

     Other than name (Amp Supply Co.) no other mfgr identification.  Can you
help me with a source to purchase a new plate choke and tubes ?


Tks,

de Richard/NT2Z


From Unknown Sun Nov 26 04:51:15 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!freenet3.freenet.ufl.edu!afn01212
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Plate Choke - Where can I find ?Amp Supply amp
Date: 26 Nov 1995 00:50:38 GMT
Lines: 3
Message-ID: <498dku$[e-mail]>
NNTP-Posting-Host: freenet3.afn.org
Originator: [e-mail]

The company is located in North Carolina, but dont have a address...Sparks
W4KZL....



From Unknown Sun Nov 26 04:51:17 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!simtel!lll-winken.llnl.gov!enews.sgi.com!decwrl!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news
From: Jon Bloom <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: QEX again...
Date: 22 Nov 1995 20:41:39 GMT
Organization: American Radio Relay League
Lines: 24
Message-ID: <4901u3$[e-mail]>
References: <4894ud$[e-mail]>
NNTP-Posting-Host: mgate.arrl.org
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2N (Windows; I; 16bit)
Xref: news.epix.net rec.radio.amateur.homebrew:11693 rec.radio.amateur.misc:94584

[e-mail] (Jerry B Altzman) wrote:
>Today in the mail I received my *December* QST. (Note that it is only the
>13th of November; there are yet two weeks left in the month.)
>
>Has anyone to date received their September, October, or November QEX's?

Yes, I regret to say that we fell behind schedule. However, we are catching
up. You should have received your September issue by now, or within the next
few days at the latest (in North America, anyway). The October issue preview
copies have come back to HQ from the printer, so those should be arriving in
your mailboxes over the next couple of weeks. The November issue is at the
printer and should be hitting mailboxes shortly after the October issue, and
the December issue will go to the printer in early December for late
December/early January delivery. Following issues will continue to creep
back toward the normal schedule until things are back in order.

I apologize for the inconvenience and the delays. We'll get it fixed.
------
Jon Bloom, KE3Z                   | [e-mail]
Editor, QEX                       |
American Radio Relay League       |
225 Main St., Newington CT 06111  |




From Unknown Sun Nov 26 04:51:18 1995
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!news.ti.com!news.dseg.ti.com!usenet
From: [e-mail] (D W Hemphill KC5NG)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ramsey Kits..worth the money?
Date: 22 Nov 1995 16:32:43 GMT
Lines: 27
Message-ID: <48vjbb$[e-mail]>
References: <48t5l3$[e-mail]>
NNTP-Posting-Host: dhemphill.dseg.ti.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.5

I built the Ramsey 20m QRP transmitter.  One of the transistors was
defective right out of the package.  The power output was claimed to
be one Watt, but in reality, it was more like 350 - 400 mW.  Other
hams in D/FW have echoed the same finding (low output).  It worked
as it should, except for the lower-than-advertised power output.  I
don't like their use of RCA connectors for everything, although you
could change the connectors if you don't use their enclosure set.

I also built the Ramsey 40m receiver kit.  Junk!  It drifts like mad
and never does stabilize.  The audio output is weak, even using a
set of headphones like they suggest.

All in all, I would suggest going another way.

For roughly the same money as the two Ramsey kits and their enclosure
sets, you can buy the NN1G superhet transceiver kit, with vfo control
on transmit and full break-in.  This is a great little rig and works
far better than the Ramsey junk could ever dream of.  I built this
one a couple years ago.  Mine was featured in the July, 1994 issue
of QRP Quarterly.

I hate to bash anyone, like I'm doing to Ramsey now, but I honestly
do not feel their stuff is worth the time and effort you'll put into
it, much less the money.  There are other, better alternatives...

73 / 72 de KC5NG   QRP-ARCI # 8204



From Unknown Sun Nov 26 04:51:19 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!news1.i1.net!news1.inlink.com!usenet
From: [e-mail] (Gary V. Deutschmann, Sr.)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ramsey Kits..worth the money?
Date: Thu, 23 Nov 1995 00:14:27 GMT
Organization: Inlink
Lines: 19
Message-ID: <490e76$[e-mail]>
References: <48t5l3$[e-mail]>
NNTP-Posting-Host: slip158.inlink.com
X-Newsreader: Forte Free Agent 1.0.82

Dan Hughes <[e-mail]> wrote:

>I am considering purchasing a Ramsey 20 meter qrp outfit. I was wondering
>if anyone out there had any comments on Ramsey and their kits, both good
>and bad.

>Thanks all,

>Dan N9ZTO

You get what you pay for!
Consider the price, the quality is comperable.
I have several Ramsey kits that I have built, some are great, some not
so great, but dollar for dollar, you can't buy the components
wholesale cheaper, thus buy the kit and mod it to your own specs.

Gary - KG0ZP




From Unknown Sun Nov 26 04:51:20 1995
Path: news.epix.net!news.sprintlink.net!news.telepac.pt!usenet
From: [e-mail] (Filipe)
Newsgroups: rec.radio.amateur.homebrew
Subject: Receivers
Date: 24 Nov 1995 23:45:17 GMT
Organization: telepac
Lines: 6
Message-ID: <495led$[e-mail]>
NNTP-Posting-Host: lis6_p8.telepac.pt
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.6


Hi , I looking for simple electronic schemes for radio receivers . Something
with I can listen fire-man or police communications .
Please , answers by e-mail .
Thanks .



From Unknown Sun Nov 26 04:51:21 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!usenet.eel.ufl.edu!newsfeed.internetmci.com!in2.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (WalShults)
Newsgroups: rec.radio.amateur.homebrew
Subject: Sams Photofact
Date: 21 Nov 1995 23:17:36 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 7
Sender: [e-mail]
Message-ID: <48u890$[e-mail]>
Reply-To: [e-mail] (WalShults)
NNTP-Posting-Host: newsbf02.mail.aol.com

Hello,

Is there anyway to download Sams books via the internet?

Thanks for reading.

Wal


From Unknown Sun Nov 26 04:51:22 1995
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!usenet.kornet.nm.kr!agate!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!pipeline!psinntp!psinntp!psinntp!main03!landisj
From: [e-mail] (Joe Landis - Systems & Network Mgr)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Sams Photofact
Message-ID: <[e-mail]>
Date: 22 Nov 95 13:24:53 EST
References: <48u890$[e-mail]>
Distribution: world
Organization: North American Drager - Telford, PA
Lines: 14

In article <48u890$[e-mail]>, [e-mail] (WalShults) writes:
> Hello,
> Is there anyway to download Sams books via the internet?
> Thanks for reading.
> Wal

Hi Wal,
Why would a company that spends $$$ to compile this information, in order to
sell it for a profit, make it available free for the asking on the 'net?

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


From Unknown Sun Nov 26 04:51:23 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (WalShults)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Sams Photofact
Date: 25 Nov 1995 04:43:54 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 16
Sender: [e-mail]
Message-ID: <496ogq$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail] (WalShults)
NNTP-Posting-Host: newsbf02.mail.aol.com

>Hi Wal,
>Why would a company that spends $$$ to compile this information, in order
to
>sell it for a profit, make it available free for the asking on the 'net?

>Joe - AA3GN

I guess that's why people make money selling mods for radios/scanners -
We ALL KNOW youCAN'T get Anything like that on the net.  Sorry for the
sarcasm, but I thought maybe somewhere it was tucked away in a site, and
it was worth asking.

Take it easy :-)

Wal



From Unknown Sun Nov 26 04:51:23 1995
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!uunet!in1.uu.net!li.net!thom
From: [e-mail] (Thom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Shareware for Ft-990
Date: 25 Nov 1995 02:57:17 GMT
Organization: LI Net (Long Island Network)
Lines: 12
Message-ID: <4960md$[e-mail]>
NNTP-Posting-Host: linet01.li.net
X-Newsreader: TIN [version 1.2 PL2]

Can anyone point  me in the direction of a shareware program to run with
the Yaesu FT-990 or FT-1000?

I'd like to test drive it before going ahead.

Thnaks es 73

de Tom
WB2QDG

[e-mail]



From Unknown Sun Nov 26 04:51:24 1995
Path: news.epix.net!news.sprintlink.net!news.icon.net!usenet
From: Steve Sampson <ssampson>
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space
Subject: Re: Societies Unwashed: The sin and the apology
Date: 23 Nov 1995 15:14:03 GMT
Organization: (ICON) InterConnect Online, Inc.
Lines: 11
Message-ID: <49233r$[e-mail]>
References: <48vn5a$[e-mail]> <4908rk$[e-mail]>
NNTP-Posting-Host: okc123.icon.net
Mime-Version: 1.0
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X-Mailer: Mozilla 1.12 (X11; I; Linux 1.2.13 i486)
X-URL: news:4908rk$[e-mail]
Xref: news.epix.net rec.radio.amateur.antenna:17288 rec.radio.amateur.digital.misc:12758 rec.radio.amateur.equipment:21662 rec.radio.amateur.homebrew:11715 rec.radio.amateur.misc:94635 rec.radio.amateur.policy:32001 rec.radio.amateur.space:5812

I used to be shocked when my private electronic mail was
published.  About as shocked as my love letters being printed
in a book.  I find there are no morals in America, and no
self discipline.  Only a scum would resort to publishing a
private letter.  I used to put a little line in my signature
that said PRIVATE, but then the scum just erased that part.

I'm glad you identified the scum who published your private
mail.  Said scum should be banished from the net.  Write his
postmaster.



From Unknown Sun Nov 26 04:51:25 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!simtel!news2.acs.oakland.edu!newshub.gmr.com!news.delcoelect.com!usenet
From: [e-mail] (Alan Anderson)
Newsgroups: rec.radio.swap,rec.radio.shortwave,rec.radio.scanner,rec.radio.amateur.space,rec.radio.amateur.policy,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.digital.misc,rec.radio.amateur.antenna
Subject: Re: THE biggest THE ham THE problem.
Date: 22 Nov 1995 19:38:06 GMT
Organization: Delco Electronics Corporation, Kokomo, Indiana
Lines: 31
Distribution: usa
Message-ID: <48vu6u$[e-mail]>
References: <NEWTNews.816104817.1257.amsoft@486dx4_120> <4835e9$[e-mail]>
Reply-To: [e-mail] (Alan Anderson)
NNTP-Posting-Host: kosepc01.delcoelect.com
X-Newsreader: IBM NewsReader/2 v1.02
Xref: news.epix.net rec.radio.swap:51441 rec.radio.shortwave:66343 rec.radio.scanner:40973 rec.radio.amateur.space:5801 rec.radio.amateur.policy:31979 rec.radio.amateur.misc:94580 rec.radio.amateur.homebrew:11692 rec.radio.amateur.equipment:21619 rec.radio.amateur.digital.misc:12736 rec.radio.amateur.antenna:17263

Burt Fisher <[e-mail]> writes:
>      Frequently I hear hams say, THE name HERE is______.
>How often do you say when you meet someone (assuming your name
>is Charlie), THE name HERE is Charlie? You never do that right?

It's a different culture, Burt, and you're experiencing culture shock.
Amateur Radio has been around a lot longer than you have, and it has
developed its own "code of conduct" and a particular way of speaking.
In Mexico, one does not say "My name is ____" -- to do so would be
considered an EXTREMELY impersonal statement!  One says instead "I am
called ____" -- and that's just the way it is.

You seem to be ridiculing a common practice merely because it sounds
impersonal to you.  From the other point of view, you are attempting
to use face-to-face speaking conventions when you are communicating
with voice only, and that sounds just as strange to many "oldtimers"
as the way it's done now sounds to you.

Remember that for the most part, radio communication is just barely
interactive; while you are talking, there is no feedback from your
listener(s).  Don't expect to be able to use the same conversational
style in all situations.  For instance, how often do you begin a short
monologue with the phrase "Three minutes ago, so-and-so said:" and a
direct quotation?  How often do you punctuate your sentences with
"emotion" indicators?  Be flexible.  When in Rome, do as the Romans do.
Don't flame them lest you be burned yourself.  (Oh, sorry.  Too late.)

= === ===   === = = =   === === === === =   = === =   = = ===   = = === =
# Alan Anderson #  Ignorance can be fixed, but stupidity is permanent.  #
  (I do not speak for Delco Electronics, and DE does not speak for me.)



From Unknown Sun Nov 26 04:51:27 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!alterdial.uu.net!not-for-mail
From: Burt Fisher <[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.policy,rec.radio.amateur.space
Subject: The sin and the apology
Date: 22 Nov 1995 22:39:48 GMT
Lines: 65
Message-ID: <4908rk$[e-mail]>
References: <48vn5a$[e-mail]>
NNTP-Posting-Host: 199.172.47.193
Mime-Version: 1.0
Content-Type: multipart/mixed;
        boundary="-------------------------------134222907610805"
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)
To: luispb@equinox
Xref: news.epix.net rec.radio.amateur.antenna:17269 rec.radio.amateur.digital.misc:12742 rec.radio.amateur.equipment:21639 rec.radio.amateur.homebrew:11700 rec.radio.amateur.misc:94602 rec.radio.amateur.policy:31985 rec.radio.amateur.space:5805

This is a multi-part message in MIME format.

---------------------------------134222907610805
Content-Transfer-Encoding: 7bit
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luispb@equinox (Luis Barthel-Rosa) wrote:

>: From: Jason Yanowitz <[e-mail]>
>: Thank you for your note about Burt Fisher and our system,
>: meol.mass.edu.  We are aware of his incredibly net-unfriendly
>: activities.  Unfortunately, there is very little we can do, because
>: his untoward behavior is not originating from our system.  He has our
>: address in his signature, but he is very careful to use ccsnet.com for
>: all his abusive postings.  Were he doing it from our system, we could
>: and would take swift action.
>:
>: If you see any abusive messages originating from meol.mass.edu, please
>: send us a copy (including the header), so we can act on it.
>: We realize how annoying Burt Fisher's posts are, and if there was
>: something we could do, we would.  Please let others know about this,
>: so they can direct their anger at the correct source
>: ([e-mail]).  If you sent us this message as a result of a
>: plea to do so in a newsgroup, could you let us know the newsgroup, so
>: we can post a public explanation of Burt Fisher's relationship to our
>: system, as well as a request to learn about _any_ abuse, by _any_
>: user, coming from our system.
>: Thank you,
>: Jason Yanowitz
>: (a MEOL system administrator)



---------------------------------134222907610805
Content-Transfer-Encoding: 7bit
Content-Type: text/plain

From: Jason Yanowitz <[e-mail]>
To: [e-mail]
Subject: Apology...


I have been asked to apologize to you for the message I sent out the
other day containing my personal opinions.  In my role as MCET system
administrator I should have confined my statements to the factual
details and only responded to the extent functionally required without
editorializing.  Compounding the problem is the fact that the person
to whom I sent my supposedly private message posted it for others to
see without either my knowledge or permission. Therefore, I am hereby
apologizing to you and sending this message you as well sending the
attached retraction to the person to whom I sent my original message.

-- Jason

Attached message:

I recently replied to a complaint you made about [e-mail]
(Burt Fisher).  My response should have simply consisted of notifying
you that we are not in any way related to ccsnet.com, and cannot act
on any activities not originating from or involving our system, MEOL
(meol.mass.edu).  Any other comments I made were inappropriate in my
role as system adminstrator, and I hereby retract them.  I have
formally apologized to Burt Fisher.  Please do not post or disseminate
the message I originally sent you (the one which I am retracting).



From Unknown Sun Nov 26 04:51:29 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!alterdial.uu.net!not-for-mail
From: Burt Fisher <[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.policy,rec.radio.amateur.space
Subject: The sin and the apology
Date: 22 Nov 1995 22:40:09 GMT
Lines: 65
Message-ID: <4908s9$[e-mail]>
References: <48vn5a$[e-mail]>
NNTP-Posting-Host: 199.172.47.193
Mime-Version: 1.0
Content-Type: multipart/mixed;
        boundary="-------------------------------281212541710874"
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)
Xref: news.epix.net rec.radio.amateur.antenna:17270 rec.radio.amateur.digital.misc:12743 rec.radio.amateur.equipment:21640 rec.radio.amateur.homebrew:11701 rec.radio.amateur.misc:94603 rec.radio.amateur.policy:31986 rec.radio.amateur.space:5806

This is a multi-part message in MIME format.

---------------------------------281212541710874
Content-Transfer-Encoding: 7bit
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luispb@equinox (Luis Barthel-Rosa) wrote:

>: From: Jason Yanowitz <[e-mail]>
>: Thank you for your note about Burt Fisher and our system,
>: meol.mass.edu.  We are aware of his incredibly net-unfriendly
>: activities.  Unfortunately, there is very little we can do, because
>: his untoward behavior is not originating from our system.  He has our
>: address in his signature, but he is very careful to use ccsnet.com for
>: all his abusive postings.  Were he doing it from our system, we could
>: and would take swift action.
>:
>: If you see any abusive messages originating from meol.mass.edu, please
>: send us a copy (including the header), so we can act on it.
>: We realize how annoying Burt Fisher's posts are, and if there was
>: something we could do, we would.  Please let others know about this,
>: so they can direct their anger at the correct source
>: ([e-mail]).  If you sent us this message as a result of a
>: plea to do so in a newsgroup, could you let us know the newsgroup, so
>: we can post a public explanation of Burt Fisher's relationship to our
>: system, as well as a request to learn about _any_ abuse, by _any_
>: user, coming from our system.
>: Thank you,
>: Jason Yanowitz
>: (a MEOL system administrator)



---------------------------------281212541710874
Content-Transfer-Encoding: 7bit
Content-Type: text/plain

From: Jason Yanowitz <[e-mail]>
To: [e-mail]
Subject: Apology...


I have been asked to apologize to you for the message I sent out the
other day containing my personal opinions.  In my role as MCET system
administrator I should have confined my statements to the factual
details and only responded to the extent functionally required without
editorializing.  Compounding the problem is the fact that the person
to whom I sent my supposedly private message posted it for others to
see without either my knowledge or permission. Therefore, I am hereby
apologizing to you and sending this message you as well sending the
attached retraction to the person to whom I sent my original message.

-- Jason

Attached message:

I recently replied to a complaint you made about [e-mail]
(Burt Fisher).  My response should have simply consisted of notifying
you that we are not in any way related to ccsnet.com, and cannot act
on any activities not originating from or involving our system, MEOL
(meol.mass.edu).  Any other comments I made were inappropriate in my
role as system adminstrator, and I hereby retract them.  I have
formally apologized to Burt Fisher.  Please do not post or disseminate
the message I originally sent you (the one which I am retracting).



From Unknown Sun Nov 26 04:51:31 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!world!indra.com!coopnews.coop.net!news.den.mmc.com!NewsWatcher!user
From: [e-mail] (Booth, Thomas G)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Timecode stuff...
Followup-To: rec.radio.amateur.homebrew
Date: 22 Nov 1995 00:50:07 GMT
Organization: A Turbulent One
Lines: 67
Distribution: usa
Message-ID: <thomas.g.booth-211195162455@160.205.101.24>
References: <[e-mail]>
NNTP-Posting-Host: 160.205.101.24

In article <[e-mail]>, [e-mail] (Bruce
Lane) wrote:
>
> Hello, fellow hamateurs...
>
>       I acquired an interesting piece of gear today. It is designed to receive a
> signal from the GOES (sp?) weather satellite, supposedly at 468 MHz, extract
> the timecode info from the incoming Manchester data, and display it on the
> plasma readout on the front panel.

FWIW the two frequencies used are 468.825 MHz and 468.8375 MHz for the GOES
West (135 deg W) and the GOES East (75 deg W) satellites, respectively.

>       I've already spoken to the manufacturer (Kinemetrics/Truetime, Santa Rosa,
> CA) and they're sending me the manual for the thing. I'd very much like to be
> able to put it into active service in the shack. For the benefit of anyone who
> might have seen one of these, or may be familiar with it, it is a model 468-DC.
>
>       Here's the kicker; I live in an apartment, and would not be able to do
> anything outside for an antenna array. My question; how powerful is the signal
> from the bird? The receiver is built in to the unit; all it needs is an
> appropriate antenna connection, and I see no reason why it wouldn't lock on.

According to NIST Special Publication 432 (Revised 1990), the typical
received power with an isotropic antenna (0 dBi) is -131 dBm.

>       Is there a halfway decent antenna I can use to try this beastie out without
> alienating everyone in the complex? Being in Washington state, southeast of
> Seattle, I think I'm in a good spot to pick up GOES West.

GOES West would probably be best for you.  As far as antenna choice goes,
I'd suggest going w/ a right hand circular polarized type, unless you can
tolerate the polarization losses from a linearly polarized type.  Depending
on the coax type and length you're planning to use, you may want to
consider a quadrifilar, a circularly polarized Yagi, or a helical antenna.
You may have to consider using an LNA at the antenna if you're stuck w/ a
physically small (low gain) antenna & can't make threshold at the receiver.
 If you're willing to build your own antenna, consider some of the 70 cm
designs mentioned in the various ARRL publications & scale accordingly.

>       Second question; I built the miniature WWV 10 MHz receiver, featured in an
> issue of 'Electronics Now' a while back. I'd like to build a circuit to break
> out the 100 Hz(?) subcarrier, and extract the binary timecode data to feed to
> one of my other TCG's. Suggestions would be most welcome, as my skills in
> design are somewhat less than my computer skills. ;-)

One approach you could try is to use a 567 tone decoder to detect the 100
Hz pulses from the received baseband signal, and some logic to convert the
data to the format you need for your TCG (it's a bit tough to get more
specific w/ out knowing what format your TCG expects).  You can find enough
info on how to setup a 567 in the data sheets from the vendors who make
them (Signetics, Nat'l Semi, etc.).

The 100 Hz tones used in the WWV/WWVH broadcasts are a variation of IRIG-H
timecode, and the format is described in NIST Special Publication 432, so
you might want to get a copy from your local GPO bookstore or try
http://198.87.193.150/~clocks/clocks/clocks.html - the Web site has what
I'll call an "unofficial" HTMLized version of NIST Special Publication 432.
 The tone decoder (and your receiver's RF/IF bandpass, plus propagation
delays) will introduce delays which may or may not be tolerable for your
use, so keep this in mind.

Hope this helps, & good luck -

TGB

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


From Unknown Sun Nov 26 04:51:32 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!news.nevada.edu!silver.scs.unr.edu!news.unr.edu!equinox!luispb
From: luispb@equinox (Luis Barthel-Rosa)
Newsgroups: rec.puzzles,rec.puzzles.crosswords,rec.pyrotechnics,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.cb,rec.radio.noncomm,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap,rec.roller-coaster,rec.running,rec.scouting,rec.scuba,rec.skiing.alpine
Subject: Tired of the "sexy ham" thread?! (wrong groups!)
Date: 22 Nov 1995 17:37:46 GMT
Organization: UNR
Lines: 39
Message-ID: <48vn5a$[e-mail]>
NNTP-Posting-Host: equinox.unr.edu
Summary: Tired of reading crap
Keywords: wrong newsgroups
X-Newsreader: TIN [version 1.2 PL2]
Xref: news.epix.net rec.puzzles:52268 rec.puzzles.crosswords:4629 rec.pyrotechnics:37839 rec.radio.amateur.antenna:17258 rec.radio.amateur.digital.misc:12733 rec.radio.amateur.equipment:21616 rec.radio.amateur.homebrew:11688 rec.radio.amateur.misc:94573 rec.radio.amateur.policy:31976 rec.radio.amateur.space:5799 rec.radio.cb:24579 rec.radio.noncomm:5005 rec.radio.scanner:40967 rec.radio.shortwave:66336 rec.radio.swap:51432 rec.roller-coaster:23289 rec.running:45634 rec.scouting:37921 rec.scuba:80893 rec.skiing.alpine:33532

Are you (like the rest of us) tired of reading the "What some think
about sexy hams" or the "Idiot ham trade" in the WRONG F*#@&ng newsgroups!!!
Then you'll be interested in this letter from Jason Yanowitz from Umass.
He is a sys-administrator and is trying to thwart there postings.

The main culprit to this thread is Burt Fisher, he can be reached at
<[e-mail]>.  Complaints should be forwarded to
[e-mail].  I urge you to read the enclosed letter, it's rather
interesting.  Mr. Yanowitz would also like to know what newsgroups are being
"spammed" so, you can write to him as well.

Together, we can make this a more pleasant place!!

Luis B.R.

message enclosed:

: From: Jason Yanowitz <[e-mail]>
: Thank you for your note about Burt Fisher and our system,
: meol.mass.edu.  We are aware of his incredibly net-unfriendly
: activities.  Unfortunately, there is very little we can do, because
: his untoward behavior is not originating from our system.  He has our
: address in his signature, but he is very careful to use ccsnet.com for
: all his abusive postings.  Were he doing it from our system, we could
: and would take swift action.
:
: If you see any abusive messages originating from meol.mass.edu, please
: send us a copy (including the header), so we can act on it.
: We realize how annoying Burt Fisher's posts are, and if there was
: something we could do, we would.  Please let others know about this,
: so they can direct their anger at the correct source
: ([e-mail]).  If you sent us this message as a result of a
: plea to do so in a newsgroup, could you let us know the newsgroup, so
: we can post a public explanation of Burt Fisher's relationship to our
: system, as well as a request to learn about _any_ abuse, by _any_
: user, coming from our system.
: Thank you,
: Jason Yanowitz
: (a MEOL system administrator)


From Unknown Sun Nov 26 04:51:33 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!netnews.nwnet.net!news.nodak.edu!news
From: [e-mail] (Bob)
Newsgroups: rec.radio.amateur.homebrew
Subject: TS-140S software
Date: 21 Nov 1995 23:26:30 GMT
Organization: Bismarck State College
Lines: 4
Message-ID: <48tn76$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: prof01.elec.bsc.nodak.edu
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
X-Newsreader: WinVN 0.92.5

Can someone please help me locate software for an IF-10C Kenwood
interface.

Thank you.


From Unknown Sun Nov 26 04:51:34 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!news.kei.com!simtel!news00.sunet.se!sunic!news99.sunet.se!news.funet.fi!news.kolumbus.fi!news.csc.fi!news.eunet.fi!newsmaster
From: [e-mail] (Kurt Soderstrom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Want 6JH8 or 7360
Date: Fri, 24 Nov 1995 00:39:00 GMT
Lines: 9
Message-ID: <491u1c$[e-mail]>
NNTP-Posting-Host: ksode.pp.fi
X-Newsreader: Forte Free Agent 1.0.82

Does anyone know of a source for this (these) Beam Deflection Tubes
(Valves).
Please answer via email to: [e-mail]
or
this newsgroup.

kurt




From Unknown Sun Nov 26 04:51:35 1995
Path: news.epix.net!news.sprintlink.net!news.interport.net!usenet
From: Michael Neidich <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: WANTED Zenith Trans-Oceanic R7000-1
Date: 25 Nov 1995 12:57:14 GMT
Organization: Interport Communications Corp.
Lines: 3
Message-ID: <4973ra$[e-mail]>
NNTP-Posting-Host: neidich.port.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1N (Windows; I; 16bit)

Want to buy R7000-1 with no fine tuning backlash.  Advise condition in
detail and price wanted.  73, K2ENN NYC



From Unknown Sun Nov 26 04:51:36 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsjunkie.ans.net!Rezonet.net!news0.accent.net!usenet
From: [e-mail] (Marc Dufour)
Newsgroups: rec.puzzles,rec.puzzles.crosswords,rec.pyrotechnics,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.cb,rec.radio.noncomm,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap,rec.roller-coaster,rec.running,rec.scouting,rec.scuba,rec.skiing.alpine
Subject: Re: What some think about sexy hams
Date: Sun, 26 Nov 1995 02:36:38 GMT
Organization: Is there really one?
Lines: 27
Message-ID: <498k6u$[e-mail]>
References: <[e-mail]> <47uhb8$[e-mail]> <481qu5$[e-mail]> <4825g6$[e-mail]> <487hjv$[e-mail]> <48be57$[e-mail]>
NNTP-Posting-Host: ppp-372.accent.net
X-Newsreader: Forte Free Agent 1.0.82
Xref: news.epix.net rec.puzzles:52368 rec.puzzles.crosswords:4642 rec.pyrotechnics:37976 rec.radio.amateur.antenna:17322 rec.radio.amateur.digital.misc:12793 rec.radio.amateur.equipment:21719 rec.radio.amateur.homebrew:11737 rec.radio.amateur.misc:94721 rec.radio.amateur.policy:32035 rec.radio.amateur.space:5822 rec.radio.cb:24644 rec.radio.noncomm:5015 rec.radio.scanner:41104 rec.radio.shortwave:66493 rec.radio.swap:51624 rec.roller-coaster:23316 rec.running:45726 rec.scouting:38019 rec.scuba:81118 rec.skiing.alpine:33729


==============================================================
[e-mail] (Don Welch)
Θcrivit le - wrote on 14 Nov 1995 17:01:27 -0800:
--------------------------------------------------------------

>[e-mail] (Jim Clarke) writes:

>>I've only been an amateur radio operator for 18 years and I would have to
>(snip)
>>Don't let the bad apples spoil the excitement that can be found in amateur
>>radio, there is something there for everyone (wives/girlfriends too).

>Speaking of HAM radios, could this group help me out?  Every time I go and
>dive with my radio set, the fuse blows.  What's the trick here?

   It could have something to do with your set antenna's SWR. What does
the S-meter says just before the fuse blows?

-----------------Pour la RΘpublique Franτaise du QuΘbec-----------------
In a Republic, society should be  like school, whose prime mission is to
teach citizens how  to  judge for themselves by their own natural light.
In a democracy, it is school that must look like society, and it's prime
mission is solely to produce people adapted to the job market.
                   RΘgis Debray in "Are you a democrat or a republican?"
- Marc Dufour -- [\]ACUC 6 31874 & TDI -- http: will soon be relocated -



From Unknown Sun Nov 26 04:51:37 1995
Path: news.epix.net!news.sprintlink.net!bga.com!kr4ah
From: [e-mail] (John Meaker)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WWV propogation variability
Date: 23 Nov 1995 15:00:55 GMT
Organization: Real/Time Communications - Bob Gustwick and Associates
Lines: 37
Distribution: usa
Message-ID: <4922b8$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: maria.bga.com
X-Newsreader: TIN [version 1.2 PL2]

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

> While not pertinent to the main question above --The statements:
>
> "The frequencies as transmitted are accurate to about 1 part in 100 billion
> (1 x 10^-11) for frequency and about 0.01 ms for timing. The day-to-day
> deviations are normally less than 1 part in 1,000 billion (1 x 10^-12)."
>
> leave me somewhat confused.  Are the timing indicators allowed to drift +/-
> .01ms from one signal to the next at the transmitter?  If the daily
> deviations are 1 in 1000 billion (I assume this is on frequency) why so
> inaccurate?

   It has been a while since I've worked with extremely accurate time
standards, but here is the situaion as well as I can remember.  The
time standard is based on a series of cesium-beam oscillators (or
atomic clocks) that use some sort of intelligent averaging to feed
the master time standard oscillator.

   It should be obvious that it would be fairly easy to lock the
frequency of the transmitter to this time standard.  It is just
annother oscillator.

   The "time burst" is an audio signal that has to be detected.  That
means that the audio has to rise to a detectable level and that is
a function of the audio frequency, not the time standard or the
transmitter frequency.  0.01 ms seems incredibly accurate in this
context.  Does anyone know what WWV's highest audio frequency is
in the "time burst" ?  What does Nyquist have to say about this?

   That is why, for any kind of accurate time, you need to keep
your own local standard and use WWV, WWVH or WWVB as corrections
rather than primary frequency sources.

--
           John Meaker -=- kr4ah



From Unknown Sun Nov 26 04:51:38 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Jeff Anderson)
Newsgroups: rec.radio.amateur.homebrew
Subject: WWVB Receiver?
Date: 25 Nov 1995 02:23:38 GMT
Organization: Netcom
Lines: 9
Message-ID: <495una$[e-mail]>
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X-NETCOM-Date: Fri Nov 24  6:23:38 PM PST 1995


I'm looking into building a WWVB receiver so that I can have
(hopefully) an accurate lab frequency reference.  As anyone built one
of these, or can you point me in the direction of literature (I already
have the "73" magazine article of several years ago)?

Thanks,

Jeff, WA6AHL


From Unknown Thu Nov 30 12:17:01 1995
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: 2 meter linear desired
Date: 27 Nov 1995 15:55:31 GMT
Organization: NCEER
Lines: 7
Message-ID: <49cn1j$[e-mail]>
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Mime-Version: 1.0
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X-Newsreader: WinVN 0.99.6

I currently have a two meter HT and would like to buy or build a linear for
it. If anyone could point me in the direction of a supplier and/or plans, it
would be appriciated.

Thanks,
Kevin



From Unknown Thu Nov 30 12:17:02 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!spool.mu.edu!agate!boulder!spot.Colorado.EDU!tiemann
From: [e-mail] (TIEMANN BRUCE)
Newsgroups: rec.radio.amateur.homebrew
Subject: 40-40 mods, notes
Date: 29 Nov 1995 21:34:14 GMT
Organization: University of Colorado, Boulder
Lines: 87
Sender: Bruce Tiemann
Message-ID: <49ijkm$[e-mail]>
NNTP-Posting-Host: spot.colorado.edu

        (I know this is a bit late, but...)

        I've built the 40-40  QRP 40 meter CW transeiver described in the
Nov, 1994  QST, and I've made a few mods and measurements that may be of
interest to readers of this group.  The receive sensitivity has been
increased, QSK is approached, the use of a different final amp is
described, and the tuning range has been increased.  Birdies present
within the band serve as convenient frequency markers.

The receive sensitivity of the 40-40 as built was low:  My IC-726 with a
6' whip could hear signals that the 40-40 with a full size dipole
couldn't.  Two mods cured this: increasing C31, and adding a preamp.

With the antenna connected directly to the RF gain pot, R3, sensitivity
was better than with the antenna at the intended place (L6/C30),
indicating that loss occured somewhere in the front end.  Walking the
antenna away from R3 identified C31 as the deafener.  Replacing it with a
1000 pF ceramic (it was supposed to be 68 pF) made the thing hear about
as well with the antenna connected to antenna port as at R3, indicating
there were no more significant front-end losses.  This increased coupling
did not lead to significantly louder sidetone on transmit; it was still
just as much too loud.   Increasing the 4.7 megohm TX-audio-shunt
resistor interconnecting the drain and source of FET Q1 to 22 meg fixed it.

However, it was still insensitive,  so how about a preamp?  W1FB's QRP
notebook describes "the preamp that ICOM uses" in it's HF transceivers -
and sure enough it's in my IC-726 schematic.  (I used MPF102s.) It's two
grounded-gate JFETs on opposite sides of coupling transformers, with the
drains 22 ohms from the plus rail, and the sources 22 ohms from ground,
and both resistors bypassed on the transistor side by .047 uF caps, and
it went between C31 and R3.  It made the 40-40 *just* able to hear
atmoshperic noise.  It's nice because it's transparent to RF when power
isn't applied - you merely give it juice if you want gain.  It draws 10
ma - a good candidate for a front panel switch.

I found the hang time for T-R turnaround too long.  It's dictated by the
1M resistor and 0.1 uF cap at the gate of FET Q1.  A 0.01 for C was fast
but gave a loud pop on T-R turnaround; a 0.02 was ideal.

For the final amp I used a 2SC2075, "identical to an MRF476," in place of
the called-for 2N3553.  (The MRF476 is spec'd for 3 W output at 50 MHz.)
With the '2075, my 40-40 maxes out at about 4.5 watts.  In contrast to the
text "Adjust R2 as needed for 1.5 W key-down power [...] More is *not*
better - you'll coax a little more power out at the expense of
efficiency!"  I found increasing efficiency with greater power, up to 3W,
though this probably has more to do with the transistor than with the
circuit.  I calculated the efficiency by measuring the supply current to
the radio, and measured the RF output by hooking it up to the *antenna*
side of my MFJ-949D tuner (so as to make use of the expanded scale on
the"reflected" power meter) and terminated the "transmitter" port on the
tuner with 50 ohms.  With 15 volts on the rail, here's what I got:

0.05 watts output       80 ma TX draw   1.2 W Input     4% eff.
0.5 W                   160 ma          2.4 W           21%
1 W                     215 ma          3.23 W          31%
2 W                     290 ma          4.35 W          46%
3 W                     365 ma          5.48 W          55%
4W                      510 ma          7.65 W          52%

So with a 2SC2075, it looks like the highest eff. is at  3W, right at the
spec of an MRF476.  Note also that though it drops up top, it's still
more efficient at 4 W out than at 1.5 W out.

Increasing C9 above 68 pF is mentioned as how to get more than 40 kHz of
tuning range.  I settled on 270 pF for C9, and a MV1162 varactor - 275 pF
nominal - for a tuning range of just over 130 kHz.  This much added
capacitance required reducing C5-C7 to .002 each, with some small NP0
caps (68 and 12 pF in my case - YMMV) in parallel to put the bottom at
6997 kHz.  This is enough spread that a ten-turn pot is called for as the
freq. knob, but I'm exploring use of two single turn pots,  a "coarse"
and a "fine," to spare my precious ten-turn pot from permanent imprisonment.

As promised in the text, there is a HUGE birdie right at 7000 kHz - and
it makes an excellent marker!  The radio is usable within 2 kHz of this
birdie, so it doesn't result in much loss of spectrum, and I chose the
bottom of the tuning range as 6997 to be sure I could tune across it.  In
addition, I found two other birdies, a weak one at 7077 kHz, and a strong
one at 7117 kHz, and these too were suitable markers, also being
unobtrusive and stable.  (I wouldn't feel so kindly toward them if there
were another means for frequency calibration!)

Next I'll make some KK7B direct - conversion transceivers... I suspect
they will make an interesting comparison to the 40-40, at least on RX!


                                        Bruce Tiemann, N6URH



From Unknown Thu Nov 30 12:17:03 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (N2WKS)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 811A VS 572B Triodes
Date: 27 Nov 1995 07:27:14 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 7
Sender: [e-mail]
Message-ID: <49car2$[e-mail]>
References: <48e56t$[e-mail]>
Reply-To: [e-mail] (N2WKS)
NNTP-Posting-Host: newsbf02.mail.aol.com

I run a heathkit warrior HA-10 kilowatt linear amplifier
The 4 811A deliver 900 watts output at 750ma plate current
and 1600 v plate voltage with 100w drive.
This output is not safe for the 811A but if the 572B
can be used instead can I safely run at 900 watts class AB?

N2WKS


From Unknown Thu Nov 30 12:17:04 1995
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!usenet.kornet.nm.kr!agate!dog.ee.lbl.gov!news.cs.utah.edu!news.aros.net!usenet
From: [e-mail] (Douglas L. Datwyler)
Newsgroups: sci.electronics.design,rec.radio.amateur.homebrew
Subject: ac motor noise suppression/cancellation
Date: 28 Nov 1995 13:45:29 GMT
Organization: ArosNet Inc.
Lines: 10
Message-ID: <49f3pr$[e-mail]>
NNTP-Posting-Host: anp28.aros.net
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.5

I have need of a few suggestions or references dealing with the VERY BROAD
spectrum noise of ac motors, such as vacuum cleaners or drills, and reducing
it or eliminating it. Any one know of something that may fit this need?

Please send e-mail to [e-mail].

TNX in advance
Douglas L. Datwyler  WR7O
[e-mail]



From Unknown Thu Nov 30 12:17:05 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!torn!nott!bcarh189.bnr.ca!crchh327.rich.bnr.ca!b4pph13e!cnc23a
From: [e-mail] (Ken Edwards)
Newsgroups: rec.radio.amateur.homebrew
Subject: Address/Phone Number needed
Date: 27 Nov 1995 20:37:29 GMT
Organization: Bell-Northern Research, Ottawa, Canada
Lines: 12
Distribution: world
Message-ID: <49d7i9$[e-mail]>
NNTP-Posting-Host: b4pph13e.bnr.ca

Does anyone have the address and/or phone number for CelWave or
Phelps-Dodge ?  (They make duplexers)

--
======================================================================

Ken M. Edwards, PE  Bell Northern Research, Research Triangle Park, NC
[phone] email: [e-mail]    Ham: N4ZBB   Packet: [e-mail]
DX PacketCluster (tm) Node : W4DW

All opinions are my own and do not necessarily reflect the views of
my employer or co-workers, family, friends, congress, or president.


From Unknown Thu Nov 30 12:17:06 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!news.ssd.intel.com!chnews!vegas.ch.intel.com!cmoore
From: [e-mail] (Cecil A. Moore~)
Newsgroups: rec.radio.amateur.homebrew
Subject: AirDux coil source?
Date: 28 Nov 1995 18:45:59 GMT
Organization: Intel Corporation, Chandler, AZ
Lines: 4
Distribution: world
Message-ID: <49fld7$[e-mail]>
NNTP-Posting-Host: vegas.ch.intel.com

Anybody know a source for AirDux coils? Any other brand
of large coils?

thanks and 73, Cecil, KG7BK, OOTC  (not speaking for my employer)


From Unknown Thu Nov 30 12:17:06 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!news.ssd.intel.com!news.jf.intel.com!news
From: Douglas Braun <dbraun>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna
Subject: Anyone know a source for Yagi antenna parts
Date: 29 Nov 1995 17:51:13 GMT
Organization: Intel Corp., Hillsboro, OR
Lines: 9
Message-ID: <49i6ih$[e-mail]>
NNTP-Posting-Host: dtthp166.jf.intel.com
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X-URL: news:rec.radio.amateur.homebrew
Xref: news.epix.net rec.radio.amateur.homebrew:11803 rec.radio.amateur.antenna:17387

I want to find a source for element-to-boom fittings so
I can build some 2-Meter and 70-cm yagi antennas.  Is there
any place or person that sells these? (I can get plenty of Aluminum
tubing without any problem...)

Thanks,

Doug Braun (SV/N1OWU)



From Unknown Thu Nov 30 12:17:08 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!uwm.edu!chi-news.cic.net!newsfeed.internetmci.com!in2.uu.net!news00.sunet.se!sunic!news99.sunet.se!news.kth.se!isett.isk.kth.se!ib94_hin
From: Hans Insulander <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,sci.electronics
Subject: Re: Building a 1296Mhz VCO - suggestions
Date: Mon, 27 Nov 1995 10:05:46 +0100
Lines: 39
Message-ID: <[e-mail]>
References: <48vlvo$[e-mail]> <[e-mail]>
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Xref: news.epix.net rec.radio.amateur.homebrew:11755 sci.electronics:160414



On Fri, 24 Nov 1995 [e-mail] wrote:

> In rec.radio.amateur.homebrew you write:
>
> >Does anyone have any suggestion on how to build a 1296MHz VCO?
> >I have about one hundred BB809 varactor diodes. Will they work (good)
> >for this frequency?
> >I also have a bunch of MSA-0386 and MSA-0486 MMIC's. Can i use them
> >for an oscillator?
>
> The coil is a very important part and very difficult to make
> using 'regular' components. I tried 1/4lambda of semirigid coax
> (4 cm of it), and that works very nice; stability is excellent
> (.5 MHz on 23cm without any special measures)

What about stripline instead of coax? At least simplier to construct...
>
> I think the BB809 varicap (not varactor) diode should work fine.
> I tried a BB105...
>
> I don't think that an MSA builds a good oscillator because of the noise
> (broadband device). Try a regular transistor (BFR91) and use the
> MSA as buffer. I think that with a BFR96 behind that you ought to
> be able to get 100mW at least.

hmm. Think I have a bunch of BFR540 available cheap. What about them?
>
> Oh, see of you can use SMD's for the capacitors and such. Ceramics
> do not nearly work as well.
>
> Geert Jan
>
>

Thanks for your help!

/Hans Insulander   [e-mail]


From Unknown Thu Nov 30 12:17:09 1995
Newsgroups: rec.radio.amateur.homebrew,sci.electronics
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!news.nic.surfnet.nl!sun4nl!geertj
From: [e-mail] (Geert Jan de Groot)
Subject: Re: Building a 1296Mhz VCO - suggestions
X-Nntp-Posting-Host: belegen.ripe.net
Message-ID: <[e-mail]>
Sender: [e-mail] (News at news)
Organization: RIPE Network Coordination Centre
References: <48vlvo$[e-mail]> <[e-mail]> <[e-mail]>
Date: Mon, 27 Nov 1995 22:19:40 GMT
Lines: 29
Xref: news.epix.net rec.radio.amateur.homebrew:11772 sci.electronics:160461

In <[e-mail]> Hans Insulander <[e-mail]> writes:
>> The coil is a very important part and very difficult to make
>> using 'regular' components. I tried 1/4lambda of semirigid coax
>> (4 cm of it), and that works very nice; stability is excellent
>> (.5 MHz on 23cm without any special measures)
>What about stripline instead of coax? At least simplier to construct...

A stripline is not shielded, while semirigid is. I think a stripline
will work (Glenn explained that to me recently), but he used multilayer
to shield it. I'd take semirigid over the pain of making stripline every day.
Can you imagine an oscillator that doesn't detune (much) if you touch
it, or waive in the neighbourhood?

Another reason for me liking semirigid here is that I plan to use this
for a transmitter, i.e. add a few amplifiers behind. As an oscillator
is a very sensitive amp (it oscillates, right?) this shielding
will be helpful.

Try it, just for the heck of it. I was amazed; I hope you will be too
(yes, free-running FM ATV is trivial)

>hmm. Think I have a bunch of BFR540 available cheap. What about them?
I don't know that type. Pro-electron suggests 2 digits behind BFR;
is that type number correct?

Have fun hacking,

Geert Jan



From Unknown Thu Nov 30 12:17:10 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!oleane!in2p3.fr!swidir.switch.ch!scsing.switch.ch!news.belwue.de!news.uni-ulm.de!rz.uni-karlsruhe.de!rzstud1.rz.uni-karlsruhe.de!ubas
From: [e-mail] (Ralf Haueisen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Datas MRF 148 ???
Date: 29 Nov 1995 09:44:57 GMT
Organization: University of Karlsruhe, Germany
Lines: 6
Message-ID: <49ha2p$[e-mail]>
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Does anybody know the datas of MOTOROLA MRF 148  ??

73, Ralf

--
Ralf Haueisen  ***  eMail [e-mail]


From Unknown Thu Nov 30 12:17:11 1995
Date: 24 Nov 1995 16:33:58 EDT
Path: news.epix.net!news.sprintlink.net!hookup!noc.tor.hookup.net!ve3ied!whome!gts!feline!humnet.humberc.on.ca!hduff
Newsgroups: rec.radio.amateur.homebrew
From: [e-mail] (Hugh Duff)
Message-ID: <[e-mail]>
Organization: HumberNet LSS, Humber College, Canada
References: <48qes9$[e-mail]>
Subject: Re: Direct Digital Synthesis with the Qualacomm Q2220
Lines: 22


> Has anyone out there built the TW-1 from the 73 Magazine Articles by
> John Welch?
> I am trying to debug the system and have problems with its output
> being more a spectrum that a single frequency.
> Any comments or help would be welcome.
>              Thanks in advance.


I did not built John's DDS however I did build his wideband amp that
seems to do nothing.  Did you also build the amp along with his DDS ?
I built a Harris HSP45102 based DDS instead.  It has a pretty clean
output using a Coilcraft filter on the output.  I'd like to put together
a wideband amp for it to use as it as a QRP CW transmitter.
I did speak to John via e-mail once and he admitted that the amp part of
the project was not his design and could not support it so here it sits!

Regards...Hugh Duff  VA3TO


---
 ■ NFX v1.3 [000]


From Unknown Thu Nov 30 12:17:12 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!news-feed.mci.newscorp.com!news.delphi.com!usenet
From: [e-mail] (Joanne Dow)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: frequency standard using GPS?
Date: 29 Nov 1995 08:55:08 GMT
Organization: Delphi Internet Services Corporation
Lines: 54
Message-ID: <49h75c$[e-mail]>
References: <48u4bl$[e-mail]>
Reply-To: [e-mail] (Joanne Dow)
NNTP-Posting-Host: bix.com
X-Newsreader: NetBix 1.225
X-Newsreader-Author: [e-mail] (Loren Wilton)
    This message has been posted with development version software.
    If there are any problems with the message format, send me mail.

In article <48u4bl$[e-mail]>,
   [e-mail] (Richard Karlquist) wrote:
>
>Most are not suitable because they don't have 1 pulse per second (1 PPS) outputs.
>However, 1 PPS outputs are available.  For example, the Motorola Oncore
>engine has 1 PPS as an extra cost option.
..
>You don't need to tap off a 10.23 MHz. signal.   What you do is phase lock
>a crystal oscillator to the 1PPS signal by dividing the oscillator signal
>down to 1 Hz. and comparing to the 1PPS signal.  The accuracy you get is
>dependent on how stable your oscillator is, what the time constant of the
>phase locked loop is, and the resolution of your phase detector.

It entirely depends on how this 1PPS signal is derived. If there is software
intervention in its generation then there is little or no hope that it is
accurate. Most cheap GPS implementations have the entire loop in software. This
means the 1PPS output will have VERY good long term stability; but, it will
jitter quite a bit pulse to pulse. If the PLL for the Costas loops is
implemented in hardware then it can generally give a much better 1PPS signal
provided it drives all the mixer LOs.

>In the Hewlett-Packard GPS timing receiver we make at this division, we
>approach an accuracy of 1 part in 10^12 for 1 day averaging.

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

>If you just want to check the accuracy of your counter, simply measure
>the period of the 1 PPS output with averaging turned on.  You can adjust your
>counter's timebase until it reads exactly 1 second.

It'd also allow you to watch the jitter if you have good enough resolution. (It
"COULD" be as high as tens of microseconds of jitter for pure software Costas
Loops.)

>Yes, a fellow from here left and started a company to do that.
>Theoretically, it should be better.
>The jury is still out on the merits of that architecture.

I am sure it is. Such a receiver would likely be rather expensive.

As another point in the discussion do not look for a short term average to give
you an oscillator that is more accurate than about 0.1ppm. (That is "roughly"
the range of the dithering on the signals. You ain't gonna do any better than
that on a second by second basis. Note - I say "roughly". I think the precise
numbers are still quite classified. I do know I designed that stuff so I am not
about to use it as a frequency standard reference without at least an hour's
averaging time.)

>Rick Karlquist N6RK
>[e-mail]

{^_^}     Joanne Dow     The Wizardess



From Unknown Thu Nov 30 12:17:13 1995
Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!newsfeed.internetmci.com!in2.uu.net!news.dal.mobil.com!usenet
From: [e-mail] (Jake Hellbach)
Newsgroups: rec.radio.amateur.homebrew
Subject: help homebrewing 1935 transmitter
Date: Wed, 29 Nov 1995 21:06:58 GMT
Organization: MEPTEC - Mobil Oil Corporation
Lines: 11
Message-ID: <49ii8r$[e-mail]>
NNTP-Posting-Host: 158.22.101.201
X-Newsreader: Forte Free Agent 1.0.82

Hello to all,
I'm want  to build the single tube transmitter that is on the cover of
the 1995 CQ radio classics calendar. In the article it says the radio
was in a 1935 QST and I was wondering if anyone has this issue or some
other construction article on this tx.

Thanks, Jake  KK5HY
email via: [e-mail]
Check out the Westside A.R.C. Web page at:
http://www.accesscom.net/~kk5hy



From Unknown Thu Nov 30 12:17:14 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!chi-news.cic.net!news.math.psu.edu!news.cac.psu.edu!usenet
From: [e-mail] (Adam Newlin)
Newsgroups: rec.radio.amateur.homebrew
Subject: help with a project
Date: 30 Nov 1995 04:43:34 GMT
Organization: Penn State University
Lines: 11
Sender: [e-mail]
Message-ID: <49jcpm$[e-mail]>
NNTP-Posting-Host: ppp92.cac.psu.edu
X-Authinfo-User: [e-mail]
X-Posted-From: InterNews [e-mail]
X-Authenticated: axn110 on INN host hearst.cac.psu.edu

Hi, I need help with a project, if you have any engineering expertise,
or any experience making homebrew equipment I would appreciate it if
you would check out my page.

http://cac.psu.edu/~ktl103/transmitter/schematics.html

I am almost done with the project and basically just need a small
amount of guidance as to the proper modifications that need to be made.
But you'll learn more when you look at the page won't you...

Adam, KA1VZN


From Unknown Thu Nov 30 12:17:15 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: How to? (was Re: Plate Choke - Where can I find?)
Date: 29 Nov 1995 09:55:53 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 40
Sender: [e-mail]
Message-ID: <49hs9p$[e-mail]>
References: <49e4vl$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <49e4vl$[e-mail]>, [e-mail] (michael
silva) writes:

>I'm interested -- can we get good results home-winding a plate choke?
>The two potential problems that come to mind are the resonances you
>mention, and the high RF voltage across the choke (what's the
>insulation breakdown rating on magnet wire anyway?).  Anybody care to
>give a little tutorial?
>
>73,
>Mike, KK6GM

That's why a small form diameter single layer choke is best. The voltage
from turn to turn is minimal.

Series resonance is avoided by: 1.) Using minimum inductance for the
application (a few to several times the operating plate resistance) 2.)
Space winding or removing turns in the troublesome areas

Winding a good choke is best done using Edisonian methods, cut and try.
Series resonance should always be measured with the choke in the operating
position and connected at the bottom, but the tank shorted out and the top
of the choke floating from the amplifier circuitry.

A grid dip meter can be used by shorting the top of the winding to the
bottom, dips indicate trouble.

A small light bulb (or current meter) can be used connected from the top
of the choke (no short to bottom now) to the center pin of  T connecter
between a dummy load and the rig. The rig is moved up through it's range
and frequencys where the bulb glows brightly indicate series resonance.

A swept impedance display can be used by the well endowed.

If a series resonance is found, a screwdriver blade can be moved along the
winding. The resonance will suddenly move when the hot spot is "touched".
Removing turns at that point in the winding will move the series resonance
the greatest amount with the least overall inductance change.

73 Tom


From Unknown Thu Nov 30 12:17:16 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!torn!news.bc.net!rover.ucs.ualberta.ca!news.sas.ab.ca!fn1.freenet.edmonton.ab.ca!morganp
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Is there a place where,...
Date: 27 Nov 1995 01:09:48 GMT
Organization: Edmonton Freenet, Edmonton, Alberta, Canada
Lines: 9
Message-ID: <49b34s$[e-mail]>
NNTP-Posting-Host: fn1.freenet.edmonton.ab.ca
X-Newsreader: TIN [version 1.2 PL2.3]

I can find info on homebrewing receivers and (once I upgrade my lisence)
transmitters? Thanx

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


From Unknown Thu Nov 30 12:17:17 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!chi-news.cic.net!news.midplains.net!gw2.att.com!nntpa!zeus!jkbe
From: jkbe@zeus (John_Bednar)
Subject: Kenwood TS-870
Message-ID: <[e-mail]>
Sender: [e-mail] (Netnews Administration)
Nntp-Posting-Host: zeus.cnet.att.com
Organization: AT&T
X-Newsreader: TIN [version 1.2 PL2]
Date: Wed, 29 Nov 1995 16:22:13 GMT
Lines: 12


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

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

Sorry if this isn't the proper newsgroup but I expect more of the
"how it works" types here.

John, WB3ESS



From Unknown Thu Nov 30 12:17:18 1995
Path: news.epix.net!news.sprintlink.net!nntp.coast.net!oleane!jussieu.fr!univ-lyon1.fr!in2p3.fr!swidir.switch.ch!serra.unipi.it!icnucevx.cnuce.cnr.it!organiss
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Looking for instructions on Infotech 200 and M200E
Date: 27 Nov 95 22:38:33 +0100
Organization: CNUCE - CNR, Pisa - Italy
Lines: 12
Message-ID: <[e-mail]>
NNTP-Posting-Host: icnucevx.cnuce.cnr.it

Dear Ham friends,
my call-sign is IN3YGW and I am an Italian radio amateur. I'm looking for the I
nstruction book of an RTTY equipment produced by the Infotech. I mean two diffe
rent models: model 300 and the model M200E.
If somebody can send it to me I will pay for all the expenses. Anyway, if you h
ave the instructions just contact me and we will sure agree.
Since I am guest of another Internet user, please e-mail your answers to MASTIN
[e-mail]
Thanks in advance for your kind collaboration,

       Antonello Mastino
       IN3YGW


From Unknown Thu Nov 30 12:17:19 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.datasync.com!news
From: gdfender <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Mass Production of P.C. boards
Date: 28 Nov 1995 20:15:10 GMT
Organization: Datasync Internet
Lines: 9
Message-ID: <49fqke$[e-mail]>
NNTP-Posting-Host: os-ppp1.datasync.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)

Does anyone knw where I can get P.C. boards mass produced (300-1000 at a
time) with good quality and price? Overseas ok..

Please respond to

Gary at [e-mail]

thanks, Gary W6SZX



From Unknown Thu Nov 30 12:17:20 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Jeff Anderson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Measuring phase noise with HP 8640B
Date: 28 Nov 1995 12:43:47 GMT
Organization: Netcom
Lines: 19
Message-ID: <49f063$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ix-pa12-23.ix.netcom.com
X-NETCOM-Date: Tue Nov 28  4:43:47 AM PST 1995

In <[e-mail]>
[e-mail] (Peter L. Williamson) writes:
>
>Hello Geoff, Where did you get the aricle on measuring phase noise
with the
>8640??.
>Peter L. Williamson
>VK4AWP.
>

Peter,

The technique is on page 14.12 of the '95 edition of the "Radio
Amateur's Handbook" (and can probably be found in other Handbooks).  It
is also discussed in the two-part series entitled "Phase Noise and its
Effects on Amateur Communications", published in the March and April,
'88 issues of "QST".

- Jeff, WA6AHL


From Unknown Thu Nov 30 12:17:21 1995
Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usenet
From: Wes Stewart <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Measuring phase-noise with HP 8640B
Date: 28 Nov 1995 06:02:53 GMT
Organization: Arizona Daily Star - AZSTARNET
Lines: 19
Message-ID: <49e8md$[e-mail]>
References: <495ui8$[e-mail]>
NNTP-Posting-Host: usr3ip30.azstarnet.com
Mime-Version: 1.0
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Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)

[e-mail] (Jeff Anderson) wrote:
>
>I was just skimming the Handbook and came across an interesting article
>discussing oscillator phase-noise, and a simple technique for measuring
>it by phase-locking an HP-8640B generator to the oscillator signal.


[snip]


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

If they had an '8662, it would be a different story.

regards, Wes



From Unknown Thu Nov 30 12:17:21 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!usenet.eel.ufl.edu!newsfeed.internetmci.com!uwm.edu!lll-winken.llnl.gov!enews.sgi.com!decwrl!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news
From: Zack Lau <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Measuring phase-noise with HP 8640B
Date: 28 Nov 1995 18:45:57 GMT
Organization: American Radio Relay League
Lines: 17
Message-ID: <49fld6$[e-mail]>
References: <495ui8$[e-mail]>
NNTP-Posting-Host: mgate.arrl.org
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2N (Windows; I; 16bit)

[e-mail] (Jeff Anderson) wrote:
>
>I was just skimming the Handbook and came across an interesting article
>discussing oscillator phase-noise, and a simple technique for measuring
>it by phase-locking an HP-8640B generator to the oscillator signal.

>    Question 2:  I think the article mentioned that the filter
>    was a 1 MHz low-pass.  How many poles should it be?  Is
>    shape important, or can I get by with a simple topology
>    (like, say, an RC lowpass)?

This filter may not be needed. It was added to avoid
relying on the spectrum analyzer to ignore the high
frequency products coming out of the spectrum analyzer.

Zack KH6CP/1



From Unknown Thu Nov 30 12:17:23 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews
From: [e-mail] (Jeff Anderson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Measuring phase-noise with HP 8640B
Date: 28 Nov 1995 13:59:47 GMT
Organization: Netcom
Lines: 66
Message-ID: <49f4kj$[e-mail]>
References: <495ui8$[e-mail]> <49e8md$[e-mail]>
NNTP-Posting-Host: ix-pa12-23.ix.netcom.com
X-NETCOM-Date: Tue Nov 28  5:59:47 AM PST 1995


>
>Ricks post is most informative on this topic. The operative word
>in the handbook article is "crude" phase-locked loop. If the
>oscillator under test is any good, what they are measuring is the
>performance of the '8640.
>
>If they had an '8662, it would be a different story.
>
>regards, Wes
>

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

If only I could afford an '8662...

Rick wrote:
>I have an 8640/323 also.  It omits the "lock" feature probably because
>the military correctly realized that it was of dubious value and was
>not "soldier" proof, being that it will remain in lock for about 2
>minutes at a time, typically.  Also, it is a frequency lock loop using
>the built in frequency counter, not a true synthesizer.  Hence don't
>even ask about phase noise clean up, there ain't none.  You're better
>off without it.  Who knows how it would interact with the external
>FM port?

HP *claims* that there is little interaction with the FM port
("...assures no degradation in noise from the unlocked mode").  But who
knows?

Rick, thanks for pointing me towards Wayne Ryder's article.  I dug it
up last night --  interesting!  I don't know how much of the 8640B's
counter section he scavenged, but I was surprised to see that the
counter stops counting in lock mode.  I can understand Wayne doing this
for simplicity and parts count sake, but I assumed HP would keep the
counter functional - otherwise, how would you see the frequency change
if you're in "x100" expanded mode, and you're tweaking the time base
+/- 20 ppm?  (This also means, I think, that the "tweakable" time base
cannot be the counter's time base -- otherwise, you'd never see the
frequency change as you tweak it).

I was pleasantly surprised to see how similar HP's technique was to the
one that I'd blocked out Sunday afternoon (although I planned to keep
the counter running -- hard not to do without making MAJOR mods,
although it does mean more parts).

(As a side note - to those who are complaining about QST's technical
error's, take a look at the counter schematic in this article!)

A final question - why is this not a "true" synthesizer?  I don't know
much about synthesizers, but it looks to me like a typical synthesizer
schematic:  VCO divided by M, reference divided by N, both go to a
phase detector (cleverly combined with the VCO counter's control
logic), whose output is then filtered and fed back to the VCO.  How is
this different from a real synthesizer?

Thanks for the help.

- Jeff, WA6AHL




From Unknown Thu Nov 30 12:17:24 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!uwm.edu!newsspool.doit.wisc.edu!decwrl!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news
From: Zack Lau <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Measuring phase-noise with HP 8640B
Date: 28 Nov 1995 23:09:55 GMT
Organization: American Radio Relay League
Lines: 20
Message-ID: <49g4s3$[e-mail]>
References: <495ui8$[e-mail]> <49fld6$[e-mail]>
NNTP-Posting-Host: mgate.arrl.org
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2N (Windows; I; 16bit)

Zack Lau <[e-mail]> wrote:

>>    Question 2:  I think the article mentioned that the filter
>>    was a 1 MHz low-pass.  How many poles should it be?  Is
>>    shape important, or can I get by with a simple topology
>>    (like, say, an RC lowpass)?
>
>This filter may not be needed. It was added to avoid
>relying on the spectrum analyzer to ignore the high
>frequency products coming out of the spectrum analyzer.
                                       ^^^^^^^^^^^^^^^^
**correction***    It was added to avoid relying on the
spectrum analyzer to ignore the high frequency products
coming out ofthe phase detector.  The LO+RF product could
generate spurious analyzer responses.

>Zack KH6CP/1
>




From Unknown Thu Nov 30 12:17:25 1995
Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!news.kreonet.re.kr!overload.lbl.gov!agate!howland.reston.ans.net!newsfeed.internetmci.com!chi-news.cic.net!nntp.coast.net!lll-winken.llnl.gov!enews.sgi.com!decwrl!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news
From: Ed Hare <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Measuring phase-noise with HP 8640B
Date: 29 Nov 1995 01:01:00 GMT
Organization: American Radio Relay League, Inc.
Lines: 26
Message-ID: <49gbcc$[e-mail]>
References: <495ui8$[e-mail]> <49e8md$[e-mail]>
NNTP-Posting-Host: efh.arrl.org
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2N (Windows; I; 16bit)

Wes Stewart <[e-mail]> wrote:

>[e-mail] (Jeff Anderson) wrote:

>>I was just skimming the Handbook and came across an interesting article
>>discussing oscillator phase-noise, and a simple technique for measuring
>>it by phase-locking an HP-8640B generator to the oscillator signal.

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

While this is certainly true, unfortunately, we haven't yet seen an
oscillator in amateur equipment that is better than 10 dB worse than our
HP8640s.  If they ever do get better, we will have to switch over to
using a low-noise reference crystal oscillator we have handy, at least
until someone donates a better signal generator. :-)  (It would be tax
deductible, if anyone is feeling generous!)

>If they had an '8662, it would be a different story.

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





From Unknown Thu Nov 30 12:17:26 1995
Path: news.epix.net!news.sprintlink.net!news.heurikon.com!uwvax!uwm.edu!vixen.cso.uiuc.edu!newsfeed.internetmci.com!news.kei.com!newsstand.cit.cornell.edu!newsfeed.cit.cornell.edu!news.tc.cornell.edu!newsserver.sdsc.edu!news.cerf.net!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news
From: Zack Lau <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Measuring phase-noise with HP 8640B
Date: 29 Nov 1995 17:30:05 GMT
Organization: American Radio Relay League
Lines: 20
Message-ID: <49i5at$[e-mail]>
References: <495ui8$[e-mail]>
NNTP-Posting-Host: mgate.arrl.org
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2N (Windows; I; 16bit)
To: [e-mail]

Keep in mind that it is really important to characterize
the noise-floor of *your* system.  We do this by comparing
our two HP 8640s against each other or by looking at a known
clean oscillator.

If you look at the specs for the 8640, they aren't that
great, because they give it for the oscillator before
they divide it down.  Done properly, you get 6 dB/octave
improvement on close-in phase noise you as divide it down,
so the HF phase noise is bit better than at 448 MHz.

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

Zack [e-mail]




From Unknown Thu Nov 30 12:17:27 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!tank.news.pipex.net!pipex!usenet.eel.ufl.edu!newsfeed.internetmci.com!in2.uu.net!daver!news.cerf.net!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news
From: Ed Hare <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Measuring phase-noise with HP 8640B
Date: 29 Nov 1995 23:28:23 GMT
Organization: American Radio Relay League, Inc.
Lines: 23
Message-ID: <49iqan$[e-mail]>
References: <495ui8$[e-mail]> <49e8md$[e-mail]> <49f4kj$[e-mail]>
NNTP-Posting-Host: efh.arrl.org
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2N (Windows; I; 16bit)

[e-mail] (Jeff Anderson) wrote:

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

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

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

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




From Unknown Thu Nov 30 12:17:28 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!math.ohio-state.edu!jussieu.fr!univ-lyon1.fr!elendir
From: [e-mail] (Elendir)
Newsgroups: rec.radio.amateur.homebrew
Subject: MGF 1402 noise figure. (And S param)
Date: 26 Nov 1995 16:28:12 GMT
Organization: ENST - Telecom Paris
Lines: 14
Message-ID: <49a4is$[e-mail]>
NNTP-Posting-Host: julia.enst.fr
X-Newsreader: TIN [version 1.2 PL2]

Hi,
I'm always looking for my noise figure info.

This time, I'd like to know if anybody has the NF of the MGF 1402 at
150 MHz, together with its s or y param and the optimal source imped.

I simply don't have any kind of info on this GaAsFET.

THX for any info,
Vince

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


From Unknown Thu Nov 30 12:17:29 1995
Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!uwm.edu!lll-winken.llnl.gov!venus.sun.com!news2me.EBay.Sun.COM!eastnews1.East.Sun.COM!newsworthy.West.Sun.COM!news70.West.Sun.COM!myers
From: [e-mail] (Dana Myers)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: MGF 1402 noise figure. (And S param)
Date: 26 Nov 1995 17:50:38 GMT
Organization: SunSoft South, Los Angeles, CA
Lines: 17
Message-ID: <49a9de$[e-mail]>
References: <49a4is$[e-mail]>
NNTP-Posting-Host: sunspot.west.sun.com

In article <49a4is$[e-mail]>, Elendir <[e-mail]> wrote:
>Hi,
>I'm always looking for my noise figure info.
>
>This time, I'd like to know if anybody has the NF of the MGF 1402 at
>150 MHz, together with its s or y param and the optimal source imped.
>
>I simply don't have any kind of info on this GaAsFET.

How well does the MGF1402 work at 150MHz in general?  If it is
stable, I'd guess the noise figure is low enough that you need
not worry about it :-).

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


From Unknown Thu Nov 30 12:17:30 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!chi-news.cic.net!news.cic.net!simtel!torn!nott!cunews!freenet.carleton.ca!FreeNet.Carleton.CA!ae517
From: [e-mail] (Russ Renaud)
Subject: Re: MGF 1402 noise figure. (And S param)
Message-ID: <[e-mail]>
Sender: [e-mail] (Russ Renaud)
Reply-To: [e-mail] (Russ Renaud)
Organization: The National Capital FreeNet
References:  <49a4is$[e-mail]>
Date: Mon, 27 Nov 1995 12:46:37 GMT
Lines: 22


Elendir ([e-mail]) writes:
> Hi,
> I'm always looking for my noise figure info.
>
> This time, I'd like to know if anybody has the NF of the MGF 1402 at
> 150 MHz, together with its s or y param and the optimal source imped.
>
> I simply don't have any kind of info on this GaAsFET.
>
> THX for any info,
> Vince

I've seen the s-params for the MGF1302 published in DUBUS.  I
seem to recall someone saying they were practically the same device, with
different packaging, although I can't vouch for the accuracy of this
statement.

Laissez-mois savoir si vous voulez recevoir les s-parms pour le 1302.

73 de Russ, va3rr/aa8lu



From Unknown Thu Nov 30 12:17:31 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!brighton.openmarket.com!decwrl!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news
From: Zack Lau <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: MGF 1402 noise figure. (And S param)
Date: 28 Nov 1995 18:28:14 GMT
Organization: American Radio Relay League
Lines: 21
Message-ID: <49fkbu$[e-mail]>
References: <49a4is$[e-mail]>
NNTP-Posting-Host: mgate.arrl.org
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.2N (Windows; I; 16bit)

[e-mail] (Elendir) wrote:
>Hi,
>I'm always looking for my noise figure info.
>
>This time, I'd like to know if anybody has the NF of the MGF 1402 at
>150 MHz, together with its s or y param and the optimal source imped.
>
>I simply don't have any kind of info on this GaAsFET.

DJ9BV published S parameter data for the MGF 1302 in the No. 2
1993 DUBUS.  The 1302 is a 1402 in a less expensive package--it
shouldn't make much of a difference at 2 meters.  You might be
able to estimate the noise parameters from the information in
his 2 meter preamp article published the previous issue.

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

Zack KH6CP/1



From Unknown Thu Nov 30 12:17:32 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!swrinde!cssun.mathcs.emory.edu!hobbes.cc.uga.edu!aisun3.ai.uga.edu!mcovingt
From: [e-mail] (Michael Covington)
Newsgroups: rec.radio.amateur.homebrew,sci.electronics.repair
Subject: N4TMI on Desoldering: MORE DATA
Date: 28 Nov 1995 02:41:56 GMT
Organization: University of Georgia, Athens
Lines: 21
Message-ID: <49dstk$[e-mail]>
NNTP-Posting-Host: aisun3.ai.uga.edu
X-Newsreader: TIN [version 1.2 PL2]
Xref: news.epix.net rec.radio.amateur.homebrew:11774 sci.electronics.repair:18295

Thanks to all who responded to "The N4TMI Desoldering Contest" with
advice and suggestions.

I made another trial with copper braid ("Chem-Wick Lite") this evening
and found that I had been using it wrong.  Tonight's notes:

(1) For best performance, the braid should *not* be spread out; it should
remain narrow, just as it comes off the roll.  That way, you get more
wicking action.

(2) There's a lot of solder in each hole of a PC AT board.  Each joint
will need to be melted into copper braid about 3 times, using a fresh
place on the braid each time.

Overall performance: VERY GOOD albeit slow.

--
Michael A. Covington                http://www.ai.uga.edu/faculty/covington/
Artificial Intelligence Center                                           <><
The University of Georgia                Unless specifically indicated, I am
Athens, GA 30602-7415 U.S.A.                not speaking for the University.


From Unknown Thu Nov 30 12:17:33 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.exodus.net!news.alt.net!news1.alt.net!news.aros.net!usenet
From: [e-mail] (Douglas L. Datwyler)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NE602 sources ?
Date: 27 Nov 1995 13:58:54 GMT
Organization: ArosNet Inc.
Lines: 3
Message-ID: <49cg6u$[e-mail]>
References: <[e-mail]> <47u0v8$[e-mail]> <[e-mail]>
NNTP-Posting-Host: anp15.aros.net
Mime-Version: 1.0
Content-Type: Text/Plain; charset=ISO-8859-1
X-Newsreader: WinVN 0.99.5

JDR shows them at $1.95, both in the www catalog page and in the printed
catalog I just received.



From Unknown Thu Nov 30 12:17:34 1995
Path: news.epix.net!news.sprintlink.net!hookup!news.umbc.edu!haven.umd.edu!purdue!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!ferrari.mst6.lanl.gov!newshost.lanl.gov!usenet
From: Jim Devenport <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: NE602 sources ?
Date: 27 Nov 1995 19:52:09 GMT
Organization: Los Alamos National Laboratory
Lines: 11
Message-ID: <49d4t9$[e-mail]>
References: <[e-mail]> <47u0v8$[e-mail]> <481os1$[e-mail]> <4888ht$[e-mail]> <[e-mail]>
NNTP-Posting-Host: jdport.lanl.gov
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 32bit)


I also noticed NE602's in the BG Micro catalog for about $2
each, no minimum listed:  [e-mail]
No connection to yours truly, of course.
--
*********** Jim Devenport WB5AOX **************
*      PO Box 445, McIntosh NM 87032          *
*        http://nis-www.lanl.gov/~jdport/     *
***********************************************




From Unknown Thu Nov 30 12:17:35 1995
Path: news.epix.net!news.sprintlink.net!arther.castle.net!news.netrail.net!imci2!news.internetMCI.com!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!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: NE602 sources ?
Date: Thu, 30 Nov 1995 10:05:59
Organization: TRL
Lines: 22
Message-ID: <[e-mail]>
References: <[e-mail]> <47u0v8$[e-mail]> <481os1$[e-mail]> <4888ht$[e-mail]> <[e-mail]>
NNTP-Posting-Host: pc0126.trl.oz.au
X-Newsreader: Trumpet for Windows [Version 1.0 Rev Final Beta #7]


>> I seem to recall the NE604 is a souped up '602.  Think pinouts the same.
>> Also have seen '602s in Nuts and Volts ads..surplus houses.
>> 73>> Scott>> W7GSM
>> Alan Wong (wong@PROBLEM_WITH_INEWS_DOMAIN_FILE) wrote:.......
>> : Jim Devenport ([e-mail]) wrote:.................
>The NE604 is a completely different IC than NE602. They have not even the
>same amount of pins. ( 16 vs 8 ) Substitute the NE602 with an NE612 which
>is a pin for pin replacement but has a slightly better perfomance.
>Stan

Please do not perpetuate the myth that the '612 is a better (strong signal)
performer than the '602. There are very minor differences, but the "602 is the
better one (see QST May 1990 Tech Correspondence, p38 excellent and
interesting letter from Bob Zavrel, W7SX).

Electrical near equivalents include; NE602D (8-pin plastic SO), NE602FE
(8-pin Cerdip), SA602N (8-pin plastic DIP), SA602D (8-pin plastic SO),
SA602FE (8-pin Cerdip).

73, Drew Diamond, VK3XU



From Unknown Thu Nov 30 12:17:36 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!ferrari.mst6.lanl.gov!newshost.lanl.gov!usenet
From: Jim Devenport <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need small transceiver circuit
Date: 29 Nov 1995 16:48:35 GMT
Organization: Los Alamos National Laboratory
Lines: 12
Message-ID: <49i2t3$[e-mail]>
References: <49hkgn$[e-mail]>
NNTP-Posting-Host: jdport.lanl.gov
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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X-Mailer: Mozilla 1.22 (Windows; I; 32bit)
To: [e-mail]


In the USA the small 49 MHZ unlicensed "easy-talks" and pocket
sized handhelds marketed by Radio Shack cost about $29 each,
less when on sale.  It is VERY hard to build any sort of
transceiver for less than that.
--
*********** Jim Devenport WB5AOX **************
*      PO Box 445, McIntosh NM 87032          *
*        http://nis-www.lanl.gov/~jdport/     *
***********************************************




From Unknown Thu Nov 30 12:17:37 1995
Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!usenet
From: [e-mail] (Pieter Ibelings)
Newsgroups: rec.radio.amateur.homebrew
Subject: Need source of MA4P1250 PIN Diodes in small qty's
Date: 28 Nov 1995 13:43:30 GMT
Organization: Scientific Atlanta
Lines: 6
Message-ID: <49f3m2$[e-mail]>
NNTP-Posting-Host: wave.mindspring.com
Mime-Version: 1.0
X-Newsreader: WinVN 0.99.2

Please help. Thanks
AC4OP


Pieter Ibelings



From Unknown Thu Nov 30 12:17:37 1995
Path: news.epix.net!news.sprintlink.net!simtel!news.kei.com!newsfeed.internetmci.com!news.zynet.com!tesuque.cs.sandia.gov!SantaFe!usenet
From: Jim Potter <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Oscillators using mmic
Date: Mon, 27 Nov 1995 04:11:01 -0800
Organization: JP Accelerator Works, Inc.
Lines: 11
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: dial134.roadrunner.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0b2 (Windows; I; 16bit)
To: Bob Liesenfeld <[e-mail]>

Does the old tube circuit rule: "If you want an oscillator, build an
amplifier; if you want an amplifier, build an oscillator." apply to
MMIC's??  :)  :)  :)

Jim

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


From Unknown Thu Nov 30 12:17:38 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!news.cirrus.com!bug.rahul.net!a2i!infoseek.com!uunet!in2.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netcom.com!tgm
From: [e-mail] (Thomas G. McWilliams)
Subject: Re: Plate Choke - Where can I find ?
Message-ID: <[e-mail]>
Organization: Jot-Em Down Store and Library
X-Newsreader: TIN [version 1.2 PL1]
References: <[e-mail]>
Date: Sun, 26 Nov 1995 05:42:36 GMT
Lines: 12
Sender: [e-mail]

: It has a zapped plate choke and probably soft tubes.
: Other than name (Amp Supply Co.) no other mfgr identification.  Can you
: help me with a source to purchase a new plate choke and tubes ?

Remove the choke. Unwind the old wire and save it.  Buy some new magnet
wire of the same gauge at Radio Shack.  Cut a piece of new wire the same
length as the original piece.  Wind the new wire back on to the original
form.  Re-install the choke. That's it.

73,
Thomas (KI4N)
[e-mail]


From Unknown Thu Nov 30 12:17:39 1995
Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!wizard.pn.com!ci-pioneer!panda!richard.harrison
From: [e-mail] (RICHARD HARRISON)
Newsgroups: rec.radio.amateur.homebrew
Subject: Plate Choke - Where can I find ?
Message-ID: <[e-mail]>
Date: Sat, 25 Nov 95 15:27:00 -0400
Distribution: world
Organization: PandA's Den BBS, Danvers, MA, USA [phone] panda.org
Reply-To: [e-mail] (RICHARD HARRISON)
X-Newsreader: PCBoard Version 15.22
X-Mailer: PCBoard/UUOUT Version 1.20
Lines: 24


MSGID: [e-mail] 1ad50001

REPLYTO 1:330/317 UUCP

REPLYADDR [e-mail]

PID GIGO+ sn 395 at panda vsn 0.99.950801
From: [e-mail] (Richard Harrison)
Subject: Plate Choke - Where can I find ?
Organization: Delphi Internet Services Corporation

Hello Helpful Person:


     Got from flea market an Amp Supply Co. model LA-1000, 80-15 meter
amplifier.  It has a zapped plate choke and probably soft tubes.

     Other than name (Amp Supply Co.) no other mfgr identification.  Can you
help me with a source to purchase a new plate choke and tubes ?


Tks,

de Richard/NT2Z

---



From Unknown Thu Nov 30 12:17:40 1995
Path: news.epix.net!news.sprintlink.net!castle.nando.net!news
From: Dave Hockaday <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Plate Choke - Where can I find ?Amp Supply amp
Date: 26 Nov 1995 14:26:21 GMT
Organization: News & Observer Public Access
Lines: 14
Message-ID: <499ted$[e-mail]>
References: <498dku$[e-mail]>
NNTP-Posting-Host: grail1110.nando.net
Mime-Version: 1.0
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Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)

>The company is located in North Carolina, but dont have a address...Sparks
>W4KZL....

The remaining stock was bought out by one of the original engineers, Bill
Edwards K4BWC. He operates Omega Electronics in Knightdale NC and
services the Amp Supply products. His work number is [phone] (no
doubt that he's a ham, heehee). He even has stuff like the original
meters, faceplates, cabinet covers, etc. He is currently working an a new
and improved version called Omega Gold (I think that's right). Nice
looking stuff!

73 de Dave WB4IUY




From Unknown Thu Nov 30 12:17:41 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.starlink.com!usenet
From: [e-mail] (Jimothy Chow)
Newsgroups: rec.radio.amateur.homebrew
Subject: POST A FAQ...please?
Date: Sun, 26 Nov 1995 10:45:18 GMT
Organization: Star Link Internet Services
Lines: 12
Message-ID: <[e-mail]>
NNTP-Posting-Host: pm1-0.starlink.com
X-Newsreader: Forte Agent .99c/16.141

Hey, this strikes me as an interesting group.  Has anyone worked out a
FAQ and if so, could ya post it or direct me to the right web site?
Thanks a ton.


******
"She pulls the covers tighter, I press against the door.
I will be with her tonight. I will be with her tonight..."
--toadies (tyler)
******
"Suicide is self expression..."
---Type-o-negative


From Unknown Thu Nov 30 12:17:42 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.datasync.com!news
From: gdfender <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Project boxes
Date: 28 Nov 1995 20:17:04 GMT
Organization: Datasync Internet
Lines: 8
Message-ID: <49fqo0$[e-mail]>
NNTP-Posting-Host: os-ppp1.datasync.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 16bit)

Does anyone know where I can buy small (about 3x3x2) plastic project
boxes by the hundreds for a resonable price?

please respond to Gary at [e-mail]


thanks, Gary W6SZX



From Unknown Thu Nov 30 12:17:43 1995
Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!newsfeed.internetmci.com!in2.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!ferrari.mst6.lanl.gov!newshost.lanl.gov!usenet
From: Jim Devenport <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Project boxes
Date: 29 Nov 1995 03:46:31 GMT
Organization: Los Alamos National Laboratory
Lines: 14
Message-ID: <49gl2n$[e-mail]>
References: <49fqo0$[e-mail]>
NNTP-Posting-Host: jdport.lanl.gov
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.22 (Windows; I; 32bit)
To: [e-mail]

I'd recommend :

Jameco Electronics
1-800-831-4242
Boxes are VERY expensive from most all sources except some
surplus outlets, which usually don't have the quantities you
need.  Good luck.
--
*********** Jim Devenport WB5AOX **************
*      PO Box 445, McIntosh NM 87032          *
*        http://nis-www.lanl.gov/~jdport/     *
***********************************************




From Unknown Thu Nov 30 12:17:44 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (N2WKS)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QSKing a Heath SB1000 (AL80A)
Date: 27 Nov 1995 07:29:04 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 6
Sender: [e-mail]
Message-ID: <49caug$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail] (N2WKS)
NNTP-Posting-Host: newsbf02.mail.aol.com

I just saw the sb1000 in an old heath catalog
it mentioned the sb2001 upgrade as the qsk kit.

hope that helps with your search.

N2WKS, Zev


From Unknown Thu Nov 30 12:17:45 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: QST Tech Errors.... Common?
Date: 27 Nov 1995 08:52:24 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 53
Sender: [e-mail]
Message-ID: <49cfqo$[e-mail]>
References: <4950t4$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

Hi Zak,

In article <4950t4$[e-mail]>, Zack Lau <[e-mail]> writes:
>
>Which is why we try to quickly route articles through several
>staff members. While I don't care if it takes a year of more
>to publish my articles, many authors are concerned about how
>long it takes for their stuff to appear in print.

The problem I see with that is when people work together at the same
location a "pecking order" is established. Portions of the review process
are severly hampered or destroyed by the "pecking order", although it is
better than one person.

>Some stuff does have a short shelf life--we do know that
>Radio Shack likes to change its assortment of parts.  But,
>is that grounds for rejecting an article that someone has
>spend a lot of time and effort developing?

Hunh???

>>Ceratinly *a few* technical errors are simple and stand out, even a
single
>>reliable source could catch those errors. But most technical articles
>>require  ****GROUPS***** of experienced reviewers, NOT the single source
>>commonly depended on. The League doesn't need to do the work or even pay
>>for the help. The staff simply needs to learn how to allow and encourage
>>people to help. Resources are available if the staff uses them.
>
>Looks like we need to hire an expert on managing volunteer labor.
>How do you get them to give the volunteer work you hand them top
>priority?  People change jobs and they seemingly vanish...

The biggest complaint I hear from technical advisors and their assistants
is they are kept out of the loop. People actually want to help, and there
are so many of them out there I can't imagine not being able to find
several dozen respondents.

>Its also an interesting problem to decide which expert/experts
>are right.  I was surprised to find out that the K2RIW 432 MHz
>parallel4CX250 amp was actually rejected by Ham Radio.

That's true, but I was equally surprised to see the Handbook include a
steel wool balun, a forward acting speech processor, a linear amp that
connects the blower and filament transformer primary wiring to the
chassis, and so on. Look at the inability to resolve the Bruene/Maxwell
disagreement when a simple lab test would provide the truth!

Perhaps both review systems have the same problem, a few people that work
together make decisions without considering or requesting outside
independent input.

73 Tom


From Unknown Thu Nov 30 12:17:46 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!usenet.cis.ufl.edu!usenet.eel.ufl.edu!spool.mu.edu!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!explorer.csc.com!wb3ffv!bbs!Mike.Czuhajewski
From: [e-mail] (Mike Czuhajewski)
Subject: Re: Ramsey Kits..worth the money?
Sender: [e-mail] (Mike Czuhajewski)
Message-ID: <[e-mail]>
Date: Thu, 23 Nov 1995 20:48:52 GMT
Reply-To: [e-mail] (Mike Czuhajewski)
References: <48t5l3$[e-mail]> <48vjbb$[e-mail]>
X-Posting-Software: UniBoard 2.00beta3 S/N 329931
Organization: ABSnet Internet Services, Inc. - [e-mail] - (410)-361-8160
Lines: 16

Re the comment on the Ramsey QRP rigs--a few years ago I testedthe 40M
rig a friend built, looking at the output on two communications
monitors and a "real" spectrum analyzer by Hewlett Packard.  All three
agreed: the second harmonic was 20 dB below the carrier, which failed
by 10 dB to meet the minimum FCC requirement of at least 30 dB (which
rises to 40 dB for rigs over 5 watts output).  I added in a
supplemental filter, 5 element Chebyshev, cutoff 7.5 MHz, 0.1 dB
ripple, and now the second harmonic is 51 dB below the carrier;
insertion loss dropped the power from 1.6 to 1.53 watts, hardly
excessive.

The stock filter in the 40M Ramsey has 3 elements.  Anyone
knowledgeable about filters will instantly realize that using a 3
element filter on a Class C amp is begging for trouble with excessive
harmonic levels at the output.  (My article on this subject will be in
the January issue of the QRP Quarterly).


From Unknown Thu Nov 30 12:17:47 1995
Path: news.epix.net!news.sprintlink.net!news.heurikon.com!uwvax!uwm.edu!vixen.cso.uiuc.edu!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!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: RF choke color codes
Date: Thu, 30 Nov 1995 16:05:43
Organization: TRL
Lines: 17
Message-ID: <[e-mail]>
References: <49dev0$[e-mail]>
NNTP-Posting-Host: pc0126.trl.oz.au
X-Newsreader: Trumpet for Windows [Version 1.0 Rev Final Beta #7]

 Colin Schmutter writes:
>From: Colin Schmutter
>Subject: RF choke color codes
>I am a bit unclear as to how the color coding scheme applies to small RF
chokes. The type>of choke I am refering to look like small resistors and have
colored bands around them.>I can see that the first and second band refers to
a digit value as in a resistor >but the multiplier band confuses me.>For
example what value would a choke with the colors brown black and orange
represent?>Any help would be appreciated.>[e-mail]>Colin

Colin, I'm pretty sure that we read them as micro Henries instead of ohms, so
your sample choke would be 10,000 uH or 10 milliHenries.

Drew, VK3XU.





From Unknown Thu Nov 30 12:17:48 1995
Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!usenet.eel.ufl.edu!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!news.bc.net!news.bcit.bc.ca!news
From: Colin Schmutter
Newsgroups: rec.radio.amateur.homebrew
Subject: RF choke values
Date: 29 Nov 1995 17:32:03 GMT
Organization: BCIT
Lines: 17
Message-ID: <49i5ej$[e-mail]>
NNTP-Posting-Host: ham.cr.bcit.bc.ca
X-Newsreader: <WinQVT/Net v3.9>

I am a bit unclear as to how the color coding scheme applies to small RF chokes. The type
of choke I am refering to look like small resistors and have colored bands around them.

I can see that the first and second band refers to a digit value as in a resistor
but the multiplier band confuses me.

For example what value would a choke with the colors brown black and orange represent?

Any help would be appreciated.


[e-mail]

Colin





From Unknown Thu Nov 30 12:17:49 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!cssun.mathcs.emory.edu!emory!news.cc.emory.edu!hobbes.cc.uga.edu!aisun3.ai.uga.edu!mcovingt
From: [e-mail] (Michael Covington)
Newsgroups: rec.radio.amateur.homebrew
Subject: RS Electronics in Atlanta?
Date: 26 Nov 1995 18:26:28 GMT
Organization: University of Georgia, Athens
Lines: 10
Message-ID: <49abgk$[e-mail]>
NNTP-Posting-Host: aisun3.ai.uga.edu
X-Newsreader: TIN [version 1.2 PL2]

There is a new place in suburban Atlanta (near Gwinnett Place Mall)
called RS Electronics.  I haven't seen the place itself, only a billboard.
They are apparently an industrial components supplier and test equipment
dealer.  Has anyone been there yet?  What's it like?

--
Michael A. Covington                http://www.ai.uga.edu/faculty/covington/
Artificial Intelligence Center                                           <><
The University of Georgia                Unless specifically indicated, I am
Athens, GA 30602-7415 U.S.A.                not speaking for the University.


From Unknown Thu Nov 30 12:17:50 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!torn!nott!bcarh189.bnr.ca!crchh327.rich.bnr.ca!b4pph13e!cnc23a
From: [e-mail] (Ken Edwards)
Newsgroups: rec.radio.amateur.homebrew
Subject: Some specific duplexer design questions
Date: 27 Nov 1995 18:26:37 GMT
Organization: Bell-Northern Research, Ottawa, Canada
Lines: 42
Distribution: world
Message-ID: <49cvst$[e-mail]>
NNTP-Posting-Host: b4pph13e.bnr.ca


Working on a project for a class, and had some specific questions...


1)   I am working on a 900 Mhz design, any special considerations you
     would recommend ?

2)   What is the effect of the material used on a cavity/tuning rod/etc. ?

3)   What determines the diameter of the cavity ?

4)   Should the cavity be a 1/4 wavelength ?  If it were 3/4 wavelengths,
     how would that affect performance ?

5)   What is the purpose of the "coupling loops(s)" ?  What considerations
     are needed to develop the geometry ?

6)   Can a duplexer be achieved with a tuning shaft that is simply a screw
     into a cylindrical cavity ?  What is the effect of the cylinder in a
     cylinder design ?

7)   Are the interconnecting cables 1/4 wavelength ?  What is the significance
     of the interconnecting cables ?

8)   What is the circuit element model of a cavity ?

9)   How can I determine insertion loss and isolation of a design ?

10)  What would you recommend about shunt capacitors and inductors ?

11)  How do you determine the Q of the cavity circuit(s) ?


--
======================================================================

Ken M. Edwards, PE  Bell Northern Research, Research Triangle Park, NC
[phone] email: [e-mail]    Ham: N4ZBB   Packet: [e-mail]
DX PacketCluster (tm) Node : W4DW

All opinions are my own and do not necessarily reflect the views of
my employer or co-workers, family, friends, congress, or president.


From Unknown Thu Nov 30 12:17:51 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!cssun.mathcs.emory.edu!emory!news.cc.emory.edu!hobbes.cc.uga.edu!aisun3.ai.uga.edu!mcovingt
From: [e-mail] (Michael Covington)
Newsgroups: rec.radio.amateur.homebrew
Subject: The N4TMI Desoldering Contest
Date: 26 Nov 1995 18:25:30 GMT
Organization: University of Georgia, Athens
Lines: 130
Message-ID: <49abeq$[e-mail]>
NNTP-Posting-Host: aisun3.ai.uga.edu
X-Newsreader: TIN [version 1.2 PL2]

THE N4TMI DESOLDERING CONTEST

This evening (November 23, 1995), I decided to hold a fair competition
between all the different desoldering techniques available to me.
Here are the results.

I would appreciate comments on these notes from anyone more experienced.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

The goal in each case was to remove some ICs, undamaged, from a
double-sided circuit board (part of an IBM PC AT); this is the most
difficult desoldering task that I routinely face.  Single-sided boards
are _much_ easier to deal with.

Unless otherwise noted, the heat source was a 40-watt Weller
temperature-controlled iron set to 750 F, and in each case I tried the
technique quite a few times before drawing conclusions.

GENERAL PRECAUTIONS AND TECHNIQUES:

- All of these techniques work better when I wear magnifying goggles
(2x). That makes it much easier to see the condition of the surface of
the solder.

- Desoldering takes time.  All the techniques work better if each joint
is heated 5 to 10 seconds beyond the point at which it appears to melt.
That helps ensure the solder is melted all the way through the
double-sided board.

- If a joint fails to desolder properly, the thing to do is add more
solder and try again.  It is almost impossible to remove the remaining
solder from a half-desoldered joint.


TECHNIQUES AND RESULTS:


(1) HOT AIR GUN

Overall performance: VERY GOOD.  Even 40-pin ICs were removed easily.
No damage to the board occurred (not even scorching of labels).

Technique: Use a 1200-watt Black and Decker hot-air gun, with 1/2"
diameter tip, positioned 1/2" from the solder side of the board,
to heat all the pins of the IC for about 30 seconds.  Meanwhile, pull on
the IC from the component side with pliers or an IC extractor.  When the
solder melts, it can be pulled free.  Some force is needed because the
pins of the IC have been bent to hold the IC in place.

I just thought of this technique today and was delighted to see it work
so well.  A similar technique with a propane torch is sometimes
suggested, but it is more likely to scorch the board.

With this technique, the IC gets rather hot, but probably no hotter than
during initial wave soldering of the PC board.  The IC case stays below
200 F as judged by the water-drop test.

Precaution:  Droplets of solder may be blown through the holes and land
in unexpected positions on the component side.


(2) EDSYN SOLDAPULLT

Overall performance: ADEQUATE.  Fine for small components (up to 8
pins); tedious for larger ones.

Precautions:
   (a) Internal cleaning and lubrication of the Soldapullt is very
important.
   (b) For best results, melt the solder fully, then keep it melted by
applying the tip of the iron at one edge while putting the tip of the
Soldapullt on the middle of it.
   (c) After removing the solder, free up the IC pin by moving it to the
middle of the hole either with pliers or with the tip of the soldering
iron.  THIS STEP IS CRUCIAL for the ICs to come out undamaged.
   (d) A big Soldapullt performs better than a small one.


(3) DESOLDERING IRON WITH RUBBER BULB (Weller DS-40)

Overall performance: POOR.  ICs could be removed with difficulty.  With
smaller components or single-sided boards, it would be adequate.

Special precautions:
     (a) Inadequate heat transfer is the biggest problem; often a joint
simply doesn't melt.
     (b) To ensure good heat transfer, the tip must be clean, well
tinned, and the same size as the solder pad on the PC board (neither
much bigger nor much smaller). Best results are achieved when, at the
moment of initial contact, there is a droplet of solder spanning the
hole in the tip.
     (c) Before sucking away the solder, use the tip to wiggle the IC
pin back and forth, leaving it in the middle of the hole rather than at
the edge.

Some improvement results from attaching the Soldapullt in place of the
rubber bulb.


(4) COPPER BRAID (Chemtronics Chem-Wik Lite)

Overall performance: INADEQUATE for this job; I could not remove all the
solder from a hole in THIS board using this material.  It is of course
quite adequate for single-sided boards, and very helpful for cleaning up
solder from inopportune places.


(5) SPECIAL TIP TO HEAT SEVERAL PINS SIMULTANEOUSLY

I have not tried these special Ungar tips, which have been a standard
item ever since ICs appeared on the scene.  I am thinking of making a
homemade steel or copper tip just to check the results.

An obvious problem is that a different tip is needed for each size of IC
(although one could probably get away with using the 16-pin tip on
14-pin PCs).


Comments welcome!

Michael Covington, N4TMI, [e-mail]




--
Michael A. Covington                http://www.ai.uga.edu/faculty/covington/
Artificial Intelligence Center                                           <><
The University of Georgia                Unless specifically indicated, I am
Athens, GA 30602-7415 U.S.A.                not speaking for the University.


From Unknown Thu Nov 30 12:17:53 1995
Path: news.epix.net!news.sprintlink.net!news.rain.org!marvin
From: [e-mail] (Marvin Johnston)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: The N4TMI Desoldering Contest
Date: 26 Nov 1995 19:09:45 GMT
Organization: RAIN Public Access Internet (805) 967-RAIN
Lines: 24
Message-ID: <49ae1p$[e-mail]>
References: <49abeq$[e-mail]>
NNTP-Posting-Host: [e-mail]
X-Newsreader: TIN [version 1.2 PL2]

Michael Covington ([e-mail]) wrote:
: THE N4TMI DESOLDERING CONTEST

<snip>

: (4) COPPER BRAID (Chemtronics Chem-Wik Lite)

: Overall performance: INADEQUATE for this job; I could not remove all the
: solder from a hole in THIS board using this material.  It is of course
: quite adequate for single-sided boards, and very helpful for cleaning up
: solder from inopportune places.

I have used copper braid quite successfully when I am interested in
salvaging an IC.  However, the cleanliness of the solder is a BIG factor
in how successful the technique is.  Whenever I am using copper braid, I
will always apply additional flux to both the braid and the joint.  The
solder seems to suck up into the braid leaving a clean hold and the part
ready to remove.  Couple of caveats though.  1) The pins usually need to
be broken free from the side of the hole since a small amount of solder
remains.  I tend to do that with my fingernail since using the iron
sometimes leaves the problem of the pins resticking to the hole.  2)
Multilayer boards where the pin is connected to an internal ground plane
are sometimes rather difficult to removed the solder.  Thermal pads in
the original board design help out a *LOT* to reduce this problem.


From Unknown Thu Nov 30 12:17:54 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!intac!usenet
From: Bob <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: The N4TMI Desoldering Contest
Date: 27 Nov 1995 10:27:16 GMT
Organization: The Front Room Publishers
Lines: 3
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References: <49abeq$[e-mail]>
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Interesting...
Bob WA2IHJ



From Unknown Thu Nov 30 12:17:55 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!eskimo!localhost
From: [e-mail] (Bill Turner)
Subject: Re: The N4TMI Desoldering Contest
X-Nntp-Posting-Host: tia1.eskimo.com
Message-ID: <[e-mail]>
Sender: [e-mail] (News User Id)
Organization: Eskimo North (206) For-Ever
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References: <49abeq$[e-mail]>
Date: Mon, 27 Nov 1995 12:12:07 GMT
Lines: 30

In article <49abeq$[e-mail]>,
   [e-mail] (Michael Covington) wrote:
>THE N4TMI DESOLDERING CONTEST
>
>This evening (November 23, 1995), I decided to hold a fair competition
>between all the different desoldering techniques available to me.
>Here are the results.
>
>I would appreciate comments on these notes from anyone more experienced.
>^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
>The goal in each case was to remove some ICs, undamaged, from a
>double-sided circuit board (part of an IBM PC AT); this is the most
>difficult desoldering task that I routinely face.  Single-sided boards
>are _much_ easier to deal with.
>
-----------------------------------------------------------
Your technique with the hot-air gun was interesting, but anytime you pull on
the IC while the solder is molten, you risk lifting the pad off the board.  A
better way, although more expensive, is to use one of the power vacuum devices
made by Hakko, Pace and others.  They heat the board while applying a vacuum
which you control with a pushbutton.  You can do a very thorough job of
removing the solder from the hole before exerting any pull on the part.  They
cost in the several hundred buck range though, more than most hobbyists would
want to spend.  They are what the professionals use, and if you have access to
one, that's the way to go.


73, Bill W7LZP
[e-mail]


From Unknown Thu Nov 30 12:17:55 1995
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From: [e-mail] (The2X4)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: The N4TMI Desoldering Contest
Date: 27 Nov 1995 09:26:34 -0500
Organization: America Online, Inc. (1-800-827-6364)
Lines: 11
Sender: [e-mail]
Message-ID: <49chqq$[e-mail]>
References: <49abeq$[e-mail]>
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Thanks for the tip on the hot air gun.

Seems to be the answer to getting it done right.

I've been using the torch for those boards I have no use
for . Since the smell is awful, I've been looking for another way.


Tanks.........................

Carl The2x4


From Unknown Thu Nov 30 12:17:57 1995
Newsgroups: rec.radio.amateur.homebrew
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!cssun.mathcs.emory.edu!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: The N4TMI Desoldering Contest
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <49abeq$[e-mail]>
Date: Mon, 27 Nov 1995 15:20:26 GMT
Lines: 94

In article <49abeq$[e-mail]> [e-mail] (Michael Covington) writes:
>I would appreciate comments on these notes from anyone more experienced.
>^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>TECHNIQUES AND RESULTS:
>
>(1) HOT AIR GUN
>
>Overall performance: VERY GOOD.  Even 40-pin ICs were removed easily.
>No damage to the board occurred (not even scorching of labels).
>
>Technique: Use a 1200-watt Black and Decker hot-air gun, with 1/2"
>diameter tip, positioned 1/2" from the solder side of the board,
>to heat all the pins of the IC for about 30 seconds.  Meanwhile, pull on
>the IC from the component side with pliers or an IC extractor.  When the
>solder melts, it can be pulled free.  Some force is needed because the
>pins of the IC have been bent to hold the IC in place.
>
>I just thought of this technique today and was delighted to see it work
>so well.  A similar technique with a propane torch is sometimes
>suggested, but it is more likely to scorch the board.
>
>With this technique, the IC gets rather hot, but probably no hotter than
>during initial wave soldering of the PC board.  The IC case stays below
>200 F as judged by the water-drop test.
>
>Precaution:  Droplets of solder may be blown through the holes and land
>in unexpected positions on the component side.

I use a static hot air source for much of my work. Let me make a few
suggestions. First, you want a *static* hot air source. That has several
advantages, notably it won't blow solder (or parts) everywhere, and it's
easier to control exactly where the heat will go. I normally use either a
Weller Pyropen or a Bernz-O-Matic torch, either fitted with a proper
heat shroud and baffle. (Weller sells some for their Pyropen, and you
can make others from simple sheetmetal. The bigger torch is most useful
for huge multilegged parts.)

Second, for thru-hole boards, deal with any cinched pins first. Just
heat the pin with an ordinary fine point iron and use your "Greenie"
(the ubiquitous Xcelite R3322 every tech *always* has in his shirt
pocket) to pry the pin back straight.

Now if you are trying to *repair* the board, build up a small clay
dam around the part to be removed. Just use a 1/8th inch to 1/4 inch
roll of modeling clay formed around the pins of the part to be removed
to keep the hot air from spreading to other component leads. If you're
just salvaging chips, you can skip this step.

With the board held in your hand, *quickly* heat the pins with the
hot air source (with either torch recomended this should take no
more than a couple seconds, with the big torch held further away
to control the heat flux). Now rap the board sharply against the
bench and the part should fall out. Alternately, you can pry it
off from the component side with the Greenie or with a chip puller,
but if you do you run the risk of damaging the board, or the part.
It's better if you can make it fall out.

This technique works even better with SMD parts since they aren't
bound to the board with anything but solder. (Some are, however,
with a dab of adhesive between the board and the part body, for
those, apply the Greenie to pop the part off the board. Just make
sure the solder is molten when you do this or traces may come up.)

I can't emphasize enough that you need to work *quickly*. Otherwise
you can overheat the part or the adhesive holding the trace to the
board.

Nothing can beat the static hot air source for *installing* a SMD
part either. Just put a dab of solder paste on each *clean* pad,
set the part in place (with the clay dam installed to avoid heating
other parts' joints), and give it a shot of static hot air. Surface
tension of the molten solder will pull the chip into perfect alignment.
As soon as it does, remove the hot air source and let cool before
disturbing. (This obviously is a case where the hot air source has
to be static, otherwise it would blow the part out of alignment.)

Now let me talk about another *repair* technique with thru-hole
parts. Often you know a chip is bad, and need to remove it to
install a replacement part. With a multilegged DIP, this can be
a tedious process fraught with danger to the board. So just snip
the part off the board from the component side with a pair of
fine dikes. Now you can either remove each pin individually with
a fine tipped iron and a pair of needlenose pliers, or just leave
them there and solder the replacement part to the pins left from
the old part. This latter method is ugly, but it's fast and it
offers less trauma to the board, especially if it is a multilayer
board.

Gary
--
Gary Coffman KE4ZV          |    You make it,     | gatech!wa4mei!ke4zv!gary
Destructive Testing Systems |    we break it.     | emory!kd4nc!ke4zv!gary
534 Shannon Way             |    Guaranteed!      | [e-mail]
Lawrenceville, GA 30244     |                     |


From Unknown Thu Nov 30 12:17:58 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!cssun.mathcs.emory.edu!emory!news.cc.emory.edu!hobbes.cc.uga.edu!aisun6.ai.uga.edu!mcovingt
From: [e-mail] (Michael Covington)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: The N4TMI Desoldering Contest
Date: 27 Nov 1995 18:55:41 GMT
Organization: University of Georgia, Athens
Lines: 8
Message-ID: <49d1jd$[e-mail]>
References: <49abeq$[e-mail]> <[e-mail]>
NNTP-Posting-Host: aisun6.ai.uga.edu
X-Newsreader: TIN [version 1.2 PL2]

Thanks, Gary.  Straightening the bend or clinched pens with an ordinary
soldering iron prior to applying hot air sounds like a very good idea.

--
Michael A. Covington                http://www.ai.uga.edu/faculty/covington/
Artificial Intelligence Center                                           <><
The University of Georgia                Unless specifically indicated, I am
Athens, GA 30602-7415 U.S.A.                not speaking for the University.


From Unknown Thu Nov 30 12:17:59 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!nntp.crl.com!decwrl!pa.dec.com!depot.mro.dec.com!mrnews.mro.dec.com!est.enet.dec.com!randolph
From: [e-mail] (Tom Randolph)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: The N4TMI Desoldering Contest
Date: 27 NOV 95 15:10:52
Organization: Digital Equipment Corporation
Lines: 40
Message-ID: <49d73a$[e-mail]>
References: <49abeq$[e-mail]>
NNTP-Posting-Host: pida.enet.dec.com


In article <49abeq$[e-mail]>, [e-mail] (Michael Covington) writes...
>THE N4TMI DESOLDERING CONTEST
>
>- If a joint fails to desolder properly, the thing to do is add more
>solder and try again.  It is almost impossible to remove the remaining
>solder from a half-desoldered joint.

As one who's been known to pick up TV sets left at the curb on trash day for
purposes of scrounging the parts inside, I feel qualified to answer.

In the above case, another trick is to turn the board over and try again from
that side. Often the half-desoldered joints are caused by a big ground plane or
some such sinking all the heat from the pin on the opposite side.

BTW, my results over the years (some of it done for a living) exactly match
yours. Heat gun is #1 for rapid desoldering of multiple joints. If the parts on
the particular board didn't have every little lead bent over to hold them in,
you could melt large areas and just watch the parts fall out.

#2 is solder suckers of various sorts. These clear the holes of solid solder so
you can pop the pins loose by wiggling a little. The pins are indeed often
still bonded slightly. Rather tedious, but it works.

Solder wick is mostly for helping clean up after #2. I've never managed to get
it to properly desolder plated-trough holes very well.

Adding a bit of solder does help sometimes. I've come to the conclusion that
this has more to do with the rosin cleaning out the joint than with the actual
solder. Seems like both the iron and the joint get a bit oxidized and won't
transfer heat very well.

If you want to save the board, DON'T apply any kind of force to the part you're
extracting. The plated-through holes pop out very easily when hot. Let the iron
do it's job and gently tug the leads free. If they don't loosen up, something
else is holding them or the solder isn't melting.

Happy scrounging!

-Tom R.   N1OOQ   [e-mail]


From Unknown Thu Nov 30 12:18:00 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!shore!news3.near.net!loki.novalink.com!usenet
From: Mark Castiglione <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: The N4TMI Desoldering Contest
Date: 29 Nov 1995 05:31:03 GMT
Organization: NovaLink Interactive Networks (800-274-2814)
Lines: 4
Message-ID: <49gr6o$[e-mail]>
References: <49abeq$[e-mail]>
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One comment..The Heat gun method is a little extreme..I have warmed a board to aid desoldering
when using a "solder sucker" but I think a heat gun alone will do damage.The cheaper the board the
more trouble you will have..73 Mark N8REZ  M



From Unknown Thu Nov 30 12:18:01 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!vixen.cso.uiuc.edu!news.ksu.ksu.edu!news.cis.okstate.edu!news.ecn.uoknor.edu!news.uoknor.edu!news.nodak.edu!news
From: [e-mail] (Bob)
Newsgroups: rec.radio.amateur.homebrew
Subject: TS-140S software
Date: 27 Nov 1995 17:57:45 GMT
Organization: Bismarck State College
Lines: 8
Message-ID: <49cu6p$[e-mail]>
Reply-To: [e-mail]
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Please accept my apology if you answered my precvious posting and it did
not get delivered. I entered the wrong E-mail address (forgot to
include .nodak).

Can somoeone please help me locate software for an IF-10C Kenwood
interface.

Thank you.


From Unknown Thu Nov 30 12:18:02 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!munnari.OZ.AU!yarrina.connect.com.au!news.starway.net.au!tbsa.com.au!paulgren
From: [e-mail] (Paul Grenness)
Newsgroups: rec.radio.amateur.homebrew
Subject: Wanted:Schematic or Info- HP120B CRO
Date: 30 Nov 1995 01:44:46 GMT
Organization: Talkback Systems Australia
Lines: 11
Message-ID: <49j2ae$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: tbsa.com.au
X-Newsreader: TIN [version 1.2 PL2]

My old HP 120B (Valve, Rackmount) CRO has stopped and the manual I have,
for the 120A, is a bit different. HP doesn't offer any support now.
The H.T. seems low at 300V, compared to the schematic for the 120A which
says 380V.

Can anyone help with a copy of a manual or a copy of just the
schematic or even just info from a 120B schematic ???

TIA
Paul G.



From Unknown Fri Dec 01 20:25:31 1995
Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!harbinger.cc.monash.edu.au!newsserver.trl.OZ.AU!pcies4.trl.OZ.AU!ddiamond
From: [e-mail] (Drew Diamond)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Standard Broadcast Antennae
Date: Thu, 30 Nov 1995 16:56:53
Organization: TRL
Lines: 12
Distribution: world
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References: <49bcls$[e-mail]> <[e-mail]>
NNTP-Posting-Host: pc0126.trl.oz.au
X-Newsreader: Trumpet for Windows [Version 1.0 Rev Final Beta #7]


>Elektor Electronics, June '94  (pt 1) and July/Aug '94 (pt 2)- "Small Loop
>Antennas for MW, AM BC Band and VLF Reception". Excellent discussion on loop
>antenna theory  and practical construction ideas (perhaps the best recent
>article on this subject).

 Joseph Carr  wrote the excellent Elecktor article above.

My apologies Joseph.

>73, Drew Diamond, VK3XU.



From Unknown Fri Dec 01 20:25:32 1995
Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.exodus.net!news.alt.net!news.net99.net!news.igc.net!news.zynet.com!tesuque.cs.sandia.gov!ferrari.mst6.lanl.gov!newshost.lanl.gov!usenet
From: Jim Devenport <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: help homebrewing 1935 transmitter
Date: 30 Nov 1995 20:03:49 GMT
Organization: Los Alamos National Laboratory
Lines: 14
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References: <49ii8r$[e-mail]>
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You might try your local library if it's a good one.
NMSU library in Las Cruces NM used to have a fairly complete
collection of QST's, Ham Radio, Wireless World, and other mags
clear back into the early 1900's that was great for looking up
such projects.
Surely ARRL could provide reprints from their archives?
--
*********** Jim Devenport WB5AOX **************
*      PO Box 445, McIntosh NM 87032          *
*        http://nis-www.lanl.gov/~jdport/     *
***********************************************