World of Ham Radio 1997/WOHR97_AmSoft_(1997-02-01).iso/usenets/1996_09/_homebre.txt

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From [e-mail] Thu Sep 05 20:41:50 1996
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From: Jay Kobelin <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: 1KW Solid State Amp
Date: Mon, 02 Sep 1996 22:44:19 -0700
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Besides the Motorola design, anyone know a good 1KW output AMP and a
possible switching power supply (110-240VAC, 50/60HZ).

Need this equipment for DXpeditions.


Jay
WA2FIJ


From [e-mail] Thu Sep 05 20:41:51 1996
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From: [e-mail] (William L. Fuqua III)
Newsgroups: rec.radio.amateur.homebrew
Subject: 4CX250B as GG TRIODE amp ???
Date: 4 Sep 96 12:10:17 GMT
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At 01:28 PM 9/3/96 PDT

Larry Minnis wb6vgi wrote:
>Bill Orr, W6SAI, has such an amp in his Radio Handbook, 17th edition,
>on page682. He has the tubes configured as low-mu triodes. If he says
>it can be done, I for one would believe him. Larry, WB6VGI.
>
   I don't have my handbook handy but I have seen one in the radio handbook th
at
has a gg 4cx??? with bias supplies. However if you read Bill Orr's (W6SAI) EIM
AC
Amateur Service Newsletter AS-1 you will notice that he says not to use any
of the
following in gg triode connected  service (page 1, paragraph 3):

    4-65
    4x150
    4cx250
    4cx1000a

  The example he gives is for a 4x150a which dissipates 18 watts in the
control grid which is 9 times the maximum spec.
  Others in the 4cx series such as the 4cx350 have a ZERO control grid
dissipation spec.
He does give the specs for a 4-125A, 4-400A and 4-1000A.

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





From [e-mail] Thu Sep 05 20:41:52 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 4CX250B as GG TRIODE amp ???
Date: 4 Sep 1996 11:52:41 -0400
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In article <[e-mail]>, Larry Minnis <[e-mail]>
writes:

>Bill Orr, W6SAI, has such an amp in his Radio Handbook, 17th edition,
>on page682. He has the tubes configured as low-mu triodes. If he says
>it can be done, I for for one would believe him. Larry, WB6VGI.
>

I wouldn't without careful consideration of potential problems. All
suggestions you might find in books aren't always good.

One of Orr's "favorite" tactics is connecting the control grid to the
cathode. He suggests doing this in sweep tube amps even though it results
in feedback levels that de-stabilize the amplifier and send IMD through
the ceiling.

Anyone owning a Dentron GLA1000 or an Amp Supply LA-1000 can see this
problem... just set the amp to 15 or ten meters open the input port and
tune the tank to resonance with the loading control meshed. The amp will
oscillate like crazy. Measure IMD performance and it is over seven dB
worse with the cathode and grid connected, as opposed to conventional "all
grids grounded" operation.

When cathode driven, the control grid is the primary shield between the
input and output. The control grid belongs at low RF potential to ground.

When tubes are designed great care is taken in grid design to be sure IMD
is acceptable. Changing the mode of operation by not using the grid
designed to do the control function, and exciting the grid designed to be
operated at a high dc potential,  might not be the best idea if distortion
is a concern.

73 Tom


From [e-mail] Thu Sep 05 20:41:53 1996
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From: "Cliff-s" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: A not so obvious resistor question.
Date: 3 Sep 1996 16:21:51 GMT
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Dave Kirkby <[e-mail]> wrote in article
<[e-mail]>...
> I need a resistor of 10 Ohms in series with the anode supply to a tube
taking 2A
> max. Hence the resistor needs to be 40 W. However, in the event of a tube
arc, I
> do not want the resistor to fuse, so it must take the full HT (5kV) for a
short time.
> This imples it must dissipate 500,000 W. Clearly, I'm not going to buy a
500 kW
> resistor, so I'm wondering what is the best choice to find a resistor(s)
to withstand
> this without going bang. I have 3 options:
>
> 1) Buy one big (say 300 W) resistor at 10 Ohms.
> 2) Put lots of lower powered resistors in parallel
> 3) Put lots of lower powered resistors in series.
>
> Any ideas on what is the best bet ? What combination is likely to be able
to withstand
> short duration overloads better, assuming all combinations have the same
continuous
> rating ? My hunch is that one big resistor is not the way to go, since
the intense
> heat cant escape as quickly, but I could well be wrong.
>
> I once saw a book on fixed resistors, and wondered why anyone would write
such a book.
> Perhaps I now wish I had a copy on my bookshelf!
>
> ---
> Dave Kirkby G8WRB
> Dept of Medical Physics,
> University College London,
> 11-20 Capper St,
> London WC1E 6JA
> Tel: [phone]
> Fax: [phone]
>
     Dave:
                How about putting a 5 amp or so fuse in series with the
resistor. If the tube fails it will blow the fuse and not the resistor.

                                     Cliff, W7VVA


From [e-mail] Thu Sep 05 20:41:55 1996
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From: "Joseph M. Zawodny" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: A not so obvious resistor question.
Date: Tue, 03 Sep 1996 11:54:42 -0400
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Dave Kirkby wrote:
>
> I need a resistor of 10 Ohms in series with the anode supply to a tube takin
g 2A
> max. Hence the resistor needs to be 40 W. However, in the event of a tube ar
c, I
> do not want the resistor to fuse, so it must take the full HT (5kV) for a sh
ort time.
> This imples it must dissipate 500,000 W. Clearly, I'm not going to buy a 500
 kW
> resistor, so I'm wondering what is the best choice to find a resistor(s) to
withstand
> this without going bang. I have 3 options:
>
> 1) Buy one big (say 300 W) resistor at 10 Ohms.
> 2) Put lots of lower powered resistors in parallel
> 3) Put lots of lower powered resistors in series.
>
> Any ideas on what is the best bet ?

Why won't a fuse work for this?  Surely someone must make a high voltage fuse
which could be utilized.


--
Work: Dr. Joseph M. Zawodny                     Play: Joe Zawodny
      NASA Langley Research Center                    [e-mail]
      E-mail: [e-mail]               [e-mail]
      [phone]  [phone] FAX


From [e-mail] Thu Sep 05 20:41:56 1996
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From: Mark Brown <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: A not so obvious resistor question.
Date: Tue, 03 Sep 1996 12:20:34 -0700
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Cliff-s wrote:
>
> Dave Kirkby <[e-mail]> wrote in article
> <[e-mail]>...
> > I need a resistor of 10 Ohms in series with the anode supply to a tube
> taking 2A
> > max. Hence the resistor needs to be 40 W. However, in the event of a tube
> arc, I
> > do not want the resistor to fuse, so it must take the full HT (5kV) for a
> short time.
> > This imples it must dissipate 500,000 W. Clearly, I'm not going to buy a
> 500 kW
> > resistor, so I'm wondering what is the best choice to find a resistor(s)
> to withstand
> > this without going bang. I have 3 options:
> >
> > 1) Buy one big (say 300 W) resistor at 10 Ohms.
> > 2) Put lots of lower powered resistors in parallel
> > 3) Put lots of lower powered resistors in series.
> >
> > Any ideas on what is the best bet ? What combination is likely to be able
> to withstand
> > short duration overloads better, assuming all combinations have the same
> continuous
> > rating ? My hunch is that one big resistor is not the way to go, since
> the intense
> > heat cant escape as quickly, but I could well be wrong.
> >
> > I once saw a book on fixed resistors, and wondered why anyone would write
> such a book.
> > Perhaps I now wish I had a copy on my bookshelf!
> >
> > ---
> > Dave Kirkby G8WRB
> > Dept of Medical Physics,
> > University College London,
> > 11-20 Capper St,
> > London WC1E 6JA
> > Tel: [phone]
> > Fax: [phone]
> >
>      Dave:
>                 How about putting a 5 amp or so fuse in series with the
> resistor. If the tube fails it will blow the fuse and not the resistor.
>
>                                      Cliff, W7VVAThe idea is to use the resi
stor to limit arc over current - not as a fuse
removing b+ while applying drive can kill a very expensive tube. Most
designs I have seen use a 50 ohm 50 watt resistor to limit surge current
during an arc.
     Mark


From [e-mail] Thu Sep 05 20:41:57 1996
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From: [e-mail] (John Stroppel)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: A not so obvious resistor question.
Date: 3 Sep 1996 18:55:25 GMT
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How about using metal oxide varistors across the resistor and fusing the
low side of the high voltage power supply?  I know this will not protect the
tube in loss of HV and still having drive applied. But you could
interlock the HV supply to the input relay.


John WA0VYZ

--
 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 [e-mail] Thu Sep 05 20:41:58 1996
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From: "Ian White, G3SEK" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: A not so obvious resistor question.
Date: Tue, 3 Sep 1996 19:50:08 +0100
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Joseph M. Zawodny wrote:
>Dave Kirkby wrote:
>>
>> I need a resistor of 10 Ohms in series with the anode supply to a tube taki
ng
>2A
>> max. Hence the resistor needs to be 40 W. However, in the event of a tube a
rc,
>I
>> do not want the resistor to fuse, so it must take the full HT (5kV) for a
>short time.
>> This imples it must dissipate 500,000 W. Clearly, I'm not going to buy a 50
0
>kW
>> resistor, so I'm wondering what is the best choice to find a resistor(s) to

>withstand
>> this without going bang. I have 3 options:
>>
>> 1) Buy one big (say 300 W) resistor at 10 Ohms.
>> 2) Put lots of lower powered resistors in parallel
>> 3) Put lots of lower powered resistors in series.
>>
>> Any ideas on what is the best bet ?
>

>Why won't a fuse work for this?

Because the fuse protection is somewhere else. The purpose of the
resistor is to limit the maximum possible current that can flow (AKA the
prospective current), so the resistor is intended NOT to blow.

With supplies of up to 3kV off-load, I've had good luck with 100W metal-
cased wirewound resistors, about 25 ohms per kV of off-load voltage.
Although these resistors are not rated for transient high voltages from
end to end, or for transient power overloads, they seem to handle the
surge current for as long as it takes to blow the fuse or trip the
breaker.

It's best to mount the resistor on teflon pillars to avoid any problems
with voltage breakdown between the element and the metal case.
Obviously there is no point in bolting the case to a heatsink, because
it would never dissipate the heat within the timescales we're talking
about.


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


From [e-mail] Thu Sep 05 20:42:02 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: A not so obvious resistor question.
Date: 3 Sep 1996 15:35:14 -0400
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In article <[e-mail]>, [e-mail]
(Dave Kirkby) writes:

>
>I need a resistor of 10 Ohms in series with the anode supply to a tube
taking
>2A
>max. Hence the resistor needs to be 40 W. However, in the event of a tube
>arc, I
>do not want the resistor to fuse, so it must take the full HT (5kV) for a
>short time.
>This imples it must dissipate 500,000 W. Clearly, I'm not going to buy a
500
>kW
>resistor, so I'm wondering what is the best choice to find a resistor(s)
to
>withstand
>this without going bang. I have 3 options:
>
>1) Buy one big (say 300 W) resistor at 10 Ohms.
>2) Put lots of lower powered resistors in parallel
>3) Put lots of lower powered resistors in series.

You have another choice. Purchase the correct resistor.

This was one of the sore spots in AG6K's articles Dave. He suggested using
a fuse or incorrect resistor types..... of course neither is good.

Fuses are notoriously unreliable, and allow peak current of several
hundred to many thousands of amperes to flow during a fault while they
internally heat, melt, and the metallic vapor is pushed out of the way by
falling sand (if you bought a good HV type fuse). If you used a cheap LV
fuse, it may just coat the glass with metalic deposits and arc until the
glass explodes. Fuses are best used as a last resort to prevent wiring
fires when something fails, but I'm sure you know that.

A wire wound resistor also presents another problem. It has a voltage
rating from lead to lead. If that voltage is exceeded, the resistor arcs
internally from turn to turn and......zap!  No protection until the
resistor explodes in a molten internal firestorm.

The correct component is a high energy type of resistor, like a
carborundum types used in dummy loads. They have a long arc path, and
easily withstand the energy storage of a HV supply. I use a 50 ohm 250
watt resistor in the anode supply of my 3CPX5000, along with a feedback
loop that disconnects the triacs on the power mains during a fault. I can
drop a screwdriver across the anode and the only penalty is a loud snap
and a tiny pit in the blade.

In a larger 50 kVA supply I used a dump tube to ground the anode during a
fault, and it wouldn't even mark the blade during a discharge...just a
tiny "tick" and it was off.

Even without opening the mains electronically, a fast circuit breaker and
a large anode resistor will work. Be sure to use the correct value, ten
ohms seems hardly enough for a 3 kV supply. And remember, you have the ESR
of the capacitors and plate choke to help with surge limiting.

If you're gonna use protection, be sure it's a quality component that fits
the application properly.

73 Tom


From [e-mail] Thu Sep 05 20:42:03 1996
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From: Bob Doyle <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: A not so obvious resistor question.
Date: 3 Sep 1996 23:30:04 -0700
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Dave Kirkby wrote:
>
> I need a resistor of 10 Ohms in series with the anode supply to a tube takin
g 2A
> max. Hence the resistor needs to be 40 W. However, in the event of a tube ar
c, I
> do not want the resistor to fuse, so it must take the full HT (5kV) for a sh
ort time.
> This imples it must dissipate 500,000 W. Clearly, I'm not going to buy a 500
 kW
> resistor, so I'm wondering what is the best choice to find a resistor(s) to
withstand
> this without going bang. I have 3 options:
>
> 1) Buy one big (say 300 W) resistor at 10 Ohms.
> 2) Put lots of lower powered resistors in parallel
> 3) Put lots of lower powered resistors in series.
>
> Any ideas on what is the best bet ? What combination is likely to be able to
 withstand
> short duration overloads better, assuming all combinations have the same con
tinuous
> rating ? My hunch is that one big resistor is not the way to go, since the i
ntense
> heat cant escape as quickly, but I could well be wrong.
>
> I once saw a book on fixed resistors, and wondered why anyone would write su
ch a book.
> Perhaps I now wish I had a copy on my bookshelf!

I don't know much about transmitting tubes but I had a similar issue on
a airborne CRT display that operated at 14KV.  We found that:

1. Resistors that are spec'd to operate at that voltage are rare and
expensive.  Also, you are looking for an energy rating (Volts * Amps *
Time) and almost no? supplier specifies that.

2. Carbon comp resistors are the "best" at dissipating large amounts of
energy and turning it into heat.  The would get hot, emit smoke even,
but when the cooled down they were pretty much resistors still.  Too bad
nobody makes carbon comp resistors anymore.  A 2 Watt carbon comp
resistor potted correctly will standoff 14KV at altitude.

3. Metal film resistors emit light instead of dissipating the energy.
The stopped being resistors after the event.

4. Wirewound resistors would arc between the spiral wraps of the
conductor.  I've seen wirewound resistors specified in volts per inch or
resistor.  An acceptable wirewound resistor would have been too large
for our application.

5. Metal oxide resistors were next best at energy dissipation.

Your mileage may vary.  We were looking for resistors that would
dissipate a large amount of energy once in a while in an application
that had almost zero power dissipation except during the arc.


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


73
Bob Doyle WA3TGF


From [e-mail] Thu Sep 05 20:42:04 1996
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From: "Ian White, G3SEK" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: A not so obvious resistor question.
Date: Tue, 3 Sep 1996 22:41:13 +0100
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John Stroppel wrote:
>How about using metal oxide varistors across the resistor and fusing the
>low side of the high voltage power supply?

MOVs are exactly what you *don't* want - something that effectively
shorts out the current limiting resistor.


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


From [e-mail] Thu Sep 05 20:42:05 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: A not so obvious resistor question.
Date: 4 Sep 1996 14:16:30 -0400
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In article <[e-mail]>,
[e-mail] (Komljanec, Tony) writes:

>
>Unless you have a very SPECIAL power supply, it will not supply you with
>500A
>at 5kV!  If it could supply that current, you would have to worry about a

>lot more
>than just your resistor.....

The capacitors can Tony, if only for a few milliseconds.

>Find out your p/s short circuit current capabilities, calculate the
primary
>side current,
>and fuse appropriately (or provide a protection circuit based on the
voltage
>drop
>across your 10 ohm resistor).  The thermal inertia of your carefully
>selected resistor
>should take care of it until the protection interupts the current.

A fuse won't work reliabily, they carry fault currents ten's to thousand's
of times the rated current before failing. Typically fuses have failure
times of 30 seconds to HOURS  with a 100% overload. Circuit breakers are
much faster.

In any event, it's energy stored in the capacitors that are the real
problem...not the power line current.

73 Tom


From [e-mail] Thu Sep 05 20:42:06 1996
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From: [e-mail] (Komljanec, Tony)
Newsgroups: rec.radio.amateur.homebrew
Subject: A not so obvious resistor question.
Date: 4 Sep 96 13:16:43 GMT
Organization: ucsd usenet gateway
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>Date: Tue, 3 Sep 1996 12:23:55 GMT
>From: [e-mail] (Dave Kirkby)
>Subject: A not so obvious resistor question.

>I need a resistor of 10 Ohms in series with the anode supply to a tube
taking
>2A max. Hence the resistor needs to be 40 W. However, in the event of a
tube arc,
>I do not want the resistor to fuse, so it must take the full HT (5kV) for a
>short time.
>This imples it must dissipate 2,500,000 W. Clearly, I'm not going to buy a
....

Unless you have a very SPECIAL power supply, it will not supply you with
500A
at 5kV!  If it could supply that current, you would have to worry about a
lot more
than just your resistor.....

Find out your p/s short circuit current capabilities, calculate the primary
side current,
and fuse appropriately (or provide a protection circuit based on the voltage
drop
across your 10 ohm resistor).  The thermal inertia of your carefully
selected resistor
should take care of it until the protection interupts the current.

Tony K
VA3TK
Toronto, Ontario





From [e-mail] Thu Sep 05 20:42:07 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: A not so obvious resistor question.
Date: 4 Sep 1996 11:47:27 -0400
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Hi Bob,

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

>
>1. Resistors that are spec'd to operate at that voltage are rare and
>expensive.  Also, you are looking for an energy rating (Volts * Amps *
>Time) and almost no? supplier specifies that.

Several suppliers do, but they are hard to find. I liken this problem to
one of finding the correct choke, just try to find manufacturers with the
specs you need. It's cheaper just to sample and test 'til you find one!

I have dozens of different values here in my mess (I mean "lab").
Even RCD, the company that makes all the little metal and carbon film
resistors, can supply energy absorbing resistors. The big mama's all come
from Stackpole now that Carborundum is SK..

>2. Carbon comp resistors are the "best" at dissipating large amounts of
>energy and turning it into heat.  The would get hot, emit smoke even,
>but when the cooled down they were pretty much resistors still.  Too bad
>nobody makes carbon comp resistors anymore.  A 2 Watt carbon comp
>resistor potted correctly will standoff 14KV at altitude.

Still do. I get them from Allen Bradly and Stack Pole.

>3. Metal film resistors emit light instead of dissipating the energy.
>The stopped being resistors after the event.

As you say, not the resistor of choice in this application. The light
doesn't bother me, the noise and flying parts do. The circuit is mostly
bothered by the sustained arc.

>4. Wirewound resistors would arc between the spiral wraps of the
>conductor.  I've seen wirewound resistors specified in volts per inch or
>resistor.  An acceptable wirewound resistor would have been too large
>for our application.

Right on! That was my earlier point. ALL resistors have a peak voltage
breakdown limit from lead to lead. It's usually around 700 volts with a 5
or ten watt wirewound, and much less with a 1/4 or 1/2 watt.

Now think of this...... Inductance when used as a parasitic suppressor.
The only real low inductance resistor is a carbon comp type, and almost no
one makes them except Allen Bradly. I specify them for parasitic
suppressors AND small energy absorbing applications....but *not* in
applications where resistance drift is critical or long term excessive
temperature operation is expected.

If you dissect the component, you can estimate how good it will be at any
of these chores. If it has a thick resistive media, it'll be good. If it
has a resistive media that is thin, or has spiral winding, it'll be poor.

If it's a semiconductor like carbon it will eventually decrease in value
with sustained overloads. NEVER use carbon resistor for bleeders, and
avoid them for voltage dropping unless they never get warm.

73 Tom


From [e-mail] Thu Sep 05 20:42:08 1996
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From: [e-mail] (D.W.Hemphill KC5NG)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: B&W Miniductor or Air Dux coils still made?  Any for sale?
Date: 4 Sep 1996 19:47:34 GMT
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Be prepared to shell out every dollar you have made in the last ten years,
per coil, to buy from Surplus Sales of Nebraska.  They're MIGHTY proud of
everything they sell...

73 de KC5NG

In article <50f7l0$[e-mail]>, [e-mail] says...
>
>Dave
>
>In the July 1996 QST (page 126) Surplus Sales of Nebraska has an ad
>offering B&W Air Dux Coils of a variety of sizes.
>The address and phone are:
>
>Surplus Sales of Nebraska
>1502 Jones St.
>Omaha, NE 68102
>
>1-800-244-4567    to order
>402-346-4750        phone
>402-346-2939        fax
>
>I have never ordered from them so have no idea of how good they are.
>
>Good Luck
>Jim NE6O
>[e-mail]



From [e-mail] Thu Sep 05 20:42:13 1996
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From: [e-mail] (William S. Baka, Jr.)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: building a stable fm transmitter for high school class
Date: Tue, 03 Sep 96 05:05:05 GMT
Organization: Baka Engineering Services
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 <[e-mail]>
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>
> > >My neighbor teaches an electronics class at a local high school and
> > >has asked for my advice. His students build projects for class and a
> > >popular one is a low power FM (88 to 108 MHZ) transmitter that meets
> > >FCC requirement. Most of the circuits available offer poor performance
> > >being a simple LC oscillator with no buffering. He would like to find
> > >a circuit that offers good stability and sound. He would also like to
> > >avoid using a PLL or XTAL multilpier approach as this is beyoun the
> > >scope of his class.
> > >
> > Try using an overtone crystal oscillator circuit.  They oscillate directly
 on
> > the desired frequency without any multiplication, using just a single
> > transistor.  Information can be found in any ARRL handbook.

Lot's of stuff cut out.

Have you tried looking into a tunnel diode or gunn diode oscillator circuit? D
ue to the reverse impdance
at critical voltage they oscillate, they have to, and I have used tunnel diode
s this way before. What you
did not state was what 'good' stability defines. I once made an FM transmitter
 with about 5 parts that was
good for about 100 feet using a tunnel diode. Problem is that I don't know how
 easy they are to get
anymore since more modern variants have come along. GUNN diodes maybe, but the
se are mostly RADAR type
diodes and may be more expensive.

 Good luck at any rate.
 Bill Baka, [e-mail]




From [e-mail] Thu Sep 05 20:42:18 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Mark Zenier)
Subject: Re: buliding a stable fm transmitter for high school class
Message-ID: <[e-mail]>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
References: <81c7cc$14e6.98@LSNT6> <[e-mail]>
Date: Sun, 1 Sep 1996 22:02:17 GMT
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Sender: [e-mail]

in <[e-mail]>, Bill Turner wrote:
: [e-mail] wrote:
: >My neighbor teaches an electronics class at a local high school and
: >has asked for my advice. His students build projects for class and a
: >popular one is a low power FM (88 to 108 MHZ) transmitter that meets
: >FCC requirement. Most of the circuits available offer poor performance
: >being a simple LC oscillator with no buffering. He would like to find
: >a circuit that offers good stability and sound. He would also like to
: >avoid using a PLL or XTAL multilpier approach as this is beyoun the
: >scope of his class.
: ---------------------------------------------
: Try using an overtone crystal oscillator circuit.  They oscillate directly o
n
: the desired frequency without any multiplication, using just a single
: transistor.  Information can be found in any ARRL handbook.

Apparently FMing an overtone oscillator through the necessary range
(+/- 75 kHz) is pretty tricky.  Don Lancaster did have one example
in his column in Radio-Electronics or Electronics Now magazine several
years back.  He reverse engineered the schematic out of one of those
car radio - CD adaptors that Panasonic or Sony sell.  Something about
using a tuned cicuit at resonance to magnify the varying reactance, so
instead of just a varying capacitance, it would go both capacitive and
inductive.

I think it was maybe 5 years back, try www.tinaja.com, his web site
to see if he has a reprint on file.

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



From [e-mail] Thu Sep 05 20:42:19 1996
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From: Dave Skarbowski <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: Case paint for Kenwood TS-940
Date: Wed, 04 Sep 1996 20:07:58 -0400
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D.W.Hemphill KC5NG wrote:
>
> This may sound silly, but, have you inquired with Kenwood?
> It would be great if they had touch-up paint available.
>
> 73 de KC5NG
> (also a big Kenwood fan!)
>
Well, no I haven't tried Kenwood parts.  I just assumed....
Anyone?

Dave, n2fam
(a Kenwood fan but also a Yaesu and Ten-Tec fan...)


From [e-mail] Thu Sep 05 20:42:19 1996
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From: [e-mail] (D.W.Hemphill KC5NG)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: Case paint for Kenwood TS-940
Date: 4 Sep 1996 16:08:46 GMT
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This may sound silly, but, have you inquired with Kenwood?
It would be great if they had touch-up paint available.

73 de KC5NG
(also a big Kenwood fan!)

In article <[e-mail]>, [e-mail] says...
>
>Has anyone found a suitable source for the case and
>front panel paint on Kenwood HF gear?  I have a
>relatively late S/N TS940 with scatches on the case
>and the outer rim of the front panel and I'd love
>to refinish them.  The case finish looks like it would
>be tough to match as it's a textured (splattered?)
>finish.  The front panel rim is just a plain semi-gloss.
>Anybody tackle this sort of thing?  Could a local
>auto-body shop duplicate these finishes?  All suggestions
>welcomed.
>
>Dave, n2fam



From [e-mail] Thu Sep 05 20:42:21 1996
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From: [e-mail] (Hugh Duff)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: Case paint for Kenwood TS-940
Date: Thu, 05 Sep 1996 12:28:58 GMT
Organization: ICA Canada
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Dave Skarbowski <[e-mail]> wrote:

>D.W.Hemphill KC5NG wrote:
>>
>> This may sound silly, but, have you inquired with Kenwood?
>> It would be great if they had touch-up paint available.
>>
>> 73 de KC5NG
>> (also a big Kenwood fan!)
>>
>Well, no I haven't tried Kenwood parts.  I just assumed....
>Anyone?

>Dave, n2fam
>(a Kenwood fan but also a Yaesu and Ten-Tec fan...)


Failing Kenwood supplying the paint (I somehow doubt they will be very
obliging) here's what I do:

A local automotive supply chain here in Toronto (Canadian Tire)
carries a large selection of car touch up spray paint. They carry OEM
paints for most automakers' original colours.
The colour that I needed was a sort of grey with a hint of olive.
Of the 2 times that I decided to repaint a radio case I had little
trouble coming up with a near match.

I spend a little extra time preparing the case before painting by
sanding out any scratches and very carefully hammering out any
dents. After painting, I oven bake the covers in the kitchen.
Of course, ventilate the kitchen during the bake and air it out
afterwards.

Cheers,
Hugh Duff  VA3TO  Toronto




From [e-mail] Thu Sep 05 20:42:22 1996
Newsgroups: rec.radio.amateur.homebrew
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From: [e-mail] (Gary Coffman)
Subject: Re: Commercial CW use
Message-ID: <[e-mail]>
Followup-To: rec.radio.amateur.policy
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]> <4uniqt$[e-mail]> <[e-mail]> <4v021c$[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
Date: Sun, 1 Sep 1996 21:58:00 GMT
Lines: 66

***********NOTE REDIRECTED FOLLOWUP*************

In article <[e-mail]> Don Huff <[e-mail]> writes:
[snip]
>  Why is it that so many folks cannot understand why one would prefer to
>use something considered technologically obsolete?  Perhaps they may not
>be amateurs at heart, doing what they love doing.  Perhaps they are
>merely driven by the mentality of doing what is "new" or "in", or "the
>latest". Doing this, one puts oneself on an endless treadmill, at the
>mercy of marketing hype, constantly "upgrading" to the "latest", the
>"newest", etc etc ad nauseum.  I have run into this when working AMTOR
>and PACTOR in recent years.  Many whom I talk with on these modes have
>'upgraded' rigs, computers, controllers, software, endlessly in search
>of the the newest and best.  Many do not even know why one mode may or
>may not be "better" than an older one. They just buy it to have the
>"latest".  Pity them.  They are never satisfied, and never really
>understand what they are buying or why.  They are mindless purchasers,
>the consumer mentality, who apparently never get buyer's remorse.  They
>are a marketer's dream.

While there are certainly people like you describe who are only chasing
status symbols, in fairness there are those who are fascinated with the
cutting edge, who want to know all about the latest techniques, every bit
and baud, who want to experience the best performance possible. These are
people to whom the words "Hilbert Transform", "trellis coding", and
"Reed-Solomon" come as easily as the words "straight key" come to you.
When they talk about Shannon, they don't mean Del, or the Runaways.

There's a name for this sort of person, it is First Adopter. There's
another word which better describes this sort of person, it is *pioneer*.
The first amateurs to switch from spark to CW, from AM to SSB, from Morse
to Baudot, from RTTY to PACTOR were the same breed. To them, the direst
enemy of "better" is "good enough". Their status is never quo. Don't make
fun of them, they are the drivers of progress. The rest of us will trail
along behind them, following the trail they have broken for us, as time
marches on and the formerly exotic becomes the commonplace.

At every step along the road, there will be those left behind. Those
who will say "spark is good enough", or "CW is good enough" or "AM
is good enough" or "RTTY is good enough". But if they tarry too long,
they may find themselves *hopelessly* left behind and unable to catch
up with everyone else, or even comprehend what everyone else is doing.
They will become alienated from the mainstream, forced to live in
yesterday's paradigm, forever, alone.

Like modern day Luddites, they may strike out in a blind rage against
the new ways, or they may find their niche, a sort of radio Amish, where
they can rest content to let the rest of the world speed ahead while
they remain true to old Dobbin and the buggy he pulls. The latter we
can tolerate, even respect, but the former we must fight at every turn
or they'll bring us all down to their spiritually impoverished level.
We can soar with the eagles, or meekly let our wings be clipped and
be forced to grub along on the ground by those jealous of the heights
we have reached.

Gee, I feel like unfurling a banner and shouting "Excelsior!"
Am I alone in being an unabashed cheerleader for progress?
Should we all be hobbled to VT2s and Brass Racers forever?
Or is it past time to move on?

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


From [e-mail] Thu Sep 05 20:42:23 1996
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From: [e-mail] (Paul Ostby)
Newsgroups: rec.radio.amateur.homebrew
Subject: Commercial CW use
Date: 4 Sep 96 09:00:19 GMT
Organization: ucsd usenet gateway
Lines: 53
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

Gary Coffman wrote:

> Gee, I feel like unfurling a banner and shouting "Excelsior!"
> Am I alone in being an unabashed cheerleader for progress?
> Should we all be hobbled to VT2s and Brass Racers forever?
> Or is it past time to move on?

No, you are not alone.  But you are outnumbered.

Homebrewers are already a minority in the amateur radio
community, and those of us interested in state-of-the-art
topics are fewer still.

I get a chuckle out of those who claim that Morse code is an
appropriate requirement for amateur radio operators.  Today
Morse code is an arcane mode of communication which is little
used outside the amateur radio community.

The FCC expects the amateur service to "...provide for
advancing skills in both the communications and technical
phases of the art."  In my opinion a test of vocabulary,
grammar, or spelling makes as much sense as a test for
Morse code.  Maybe more.

(If Morse code is such an advanced method of communication
then why is this discussion taking place on the Internet
instead of on the HF band?)

Hand-keyed CW has its place.  I'm sure its proponents can
get a great deal of satisfaction from using it.  And in
emergency situations CW can be just as useful as many other
modes in the amateur bands.  Of course today it's the digital
modes that get through when all other modes fail.

So I don't want to take away frequencies set aside for CW.
But I do think the Morse requirements are a bit silly.

And today Morse code is not much of an obstacle to anyone
interested in the cutting edge.  The no-code license opens
up many of the amateur bands, and Part 15 operations at
VLF or ELF challenge even state-of-the-art equipment.  All
available to experimenters who don't want to learn the code.

Speaking of VLF;  I hope the FCC doesn't move the 1750m band
(160-190kHz) from Part 15 to Part 97.  Limited transmissions
are currently allowed without a license at 1750 meters, and
experimenters have developed advanced techniques to deal
with this noisy band.  It would be a shame if this became
an amateur band that was restricted to licensed Morse code
junkies.

Paul, KC7CKU



From [e-mail] Thu Sep 05 20:42:24 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!boulder!spot.Colorado.EDU!tiemann
From: [e-mail] (TIEMANN BRUCE)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Commercial CW use
Date: 4 Sep 1996 17:30:10 GMT
Organization: University of Colorado, Boulder
Lines: 19
Message-ID: <50keb2$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: spot.colorado.edu
NNTP-Posting-User: tiemann


"Speaking of VLF;  I hope the FCC doesn't move the 1750m band (160-190kHz)
from Part 15 to Part 97.  Limited transmissions are currently allowed
without a license at 1750 meters, and experimenters have developed advanced
techniques to deal with this noisy band.  It would be a shame if this
became an amateur band that was restricted to licensed Morse code junkies.

Paul, KC7CKU"

I agree it shouldn't be *restricted* to CW junkies.  However, I am all in
favor of changing the rules to permit more than 1 watt input and more than
15 m of transmission line + antenna + ground lead combined.  If they *need*
to give us a CW test for that, fine.  But let the part-15ers be.

FWIW I'm an Extra who sees both the enjoyment in using, and also the
silliness in requiring, CW.

Bruce
N6URH


From [e-mail] Thu Sep 05 20:42:25 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.scott.net!acara.snsnet.net!news5.crl.com!nntp.crl.com!howland.erols.net!newsfeed.internetmci.com!in3.uu.net!mcsun!EU.net!usenet2.news.uk.psi.net!uknet!usenet1.news.uk.psi.net!uknet!uknet!bcc.ac.uk!news
From: [e-mail] (Dave Kirkby)
Subject: Re: FS:HV PS Diodes
Sender: [e-mail] (Usenet News System)
Message-ID: <[e-mail]>
Date: Tue, 3 Sep 1996 12:09:55 GMT
Reply-To: [e-mail]
References: <[e-mail]>
Organization: UCL Dept of Medical Physics
Lines: 25

In article [e-mail], Spencer Petri <[e-mail]> writes:
> Looking for diodes for that big amp PS? These are 25KV and I ran a test
> for 4 hours at 1.38 amps (10 ohm resistor and diode across 13.8 VDC).
> $10 each or build a bridge for $35 (four diodes) plus $3 priority mail.
>
> 73 de Pete  WA5JCI


I am not aware of any power diodes made at 25 kV, which makes me suspect they
are in
fact more liekly to be a number of diodes in series. If this is the case, the
turn-on
voltage might be well over the 0.7 V, and so is significant compared to 13.8 V
. In that
case, the current you used might be well under 1.38 A.

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







From [e-mail] Thu Sep 05 20:42:26 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!holonet!colossus.holonet.net!yama.mcc.ac.uk!warwick!tank.news.pipex.net!pipex!oleane!jussieu.fr!math.ohio-state.edu!uwm.edu!spool.mu.edu!newspump.sol.net!www.nntp.primenet.com!nntp.primenet.com!news-peer.gsl.net!news.gsl.net!ix.netcom.com!news.compuserve.com!news.production.compuserve.com!news
From: PY2RN <[e-mail]>
Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,uk.radio.amateur
Subject: FT5200 9600??
Date: 4 Sep 1996 22:04:00 GMT
Organization: SP-GW.AMPR.ORG
Lines: 9
Message-ID: <50kucg$c88$[e-mail]>
Xref: news2.epix.net rec.radio.amateur.digital.misc:16875 rec.radio.amateur.equipment:32111 rec.radio.amateur.homebrew:16630 rec.radio.amateur.misc:106423 uk.radio.amateur:15495

Hi,

If you know how to make the Yaesu Ft-5200 operational on packet
at 9600bps (Where do I connect the tx/rx wires) could you please
send it to me?

Thank you.

Ed, PY2RN


From [e-mail] Thu Sep 05 20:42:30 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-ana-7.sprintlink.net!news.hti.net!news.sprintlink.net!news-dc-5.sprintlink.net!news.sprintlink.net!news-dc-9.sprintlink.net!news.cdsnet.net!news.magicnet.net!nntp.newsfirst.com!nntp.crosslink.net!munnari.OZ.AU!spool.mu.edu!usenet.eel.ufl.edu!news-feed-1.peachnet.edu!newsrelay.netins.net!news.netins.net!mr.net!news.mr.net!timbuk.cray.com!news.sgi.com!news.sprintlink.net!news-stk-200.sprintlink.net!news.sprintlink.net!news-chi-13.sprintlink.net!nntp.earthlink.net!usenet
From: [e-mail]
Newsgroups: rec.radio.scanner,rec.radio.shortwave,rec.radio.swap,rec.radio.cb,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: HELP: Antenna Tuner Design Needed
Date: Tue, 03 Sep 1996 18:19:50 GMT
Organization: Earthlink Network, Inc.
Lines: 15
Message-ID: <50hshf$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: max1-ot-ca-39.earthlink.net
X-Newsreader: Forte Free Agent 1.0.82
Xref: news2.epix.net rec.radio.scanner:55901 rec.radio.shortwave:78245 rec.radio.swap:72225 rec.radio.cb:30494 rec.radio.amateur.antenna:23981 rec.radio.amateur.equipment:32088 rec.radio.amateur.homebrew:16617 rec.radio.amateur.misc:106400

Michael Neidich <[e-mail]> wrote:

>Need a schematic/parts list to build a receiving antenna
>tuner/preselector 10-25 MHz, mostly to reject interfering out of band
>signals.  Point me in the right direction if there is a good commercial
>unit, please.
>Mike
MFJ-956 is $39.99.  One year unconditional money back warranty.  Comes
with a schematic.  By the time you add up the cost of the box, the
knobs, the switch, the fixed inductors, the variable capacitor, and
the 2 ea. SO-239 connectors, you may decide to keep it.
dr
Dave Rickmers            I'd wake up and
[e-mail]   there'd be nothing...



From [e-mail] Thu Sep 05 20:42:31 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!www.nntp.primenet.com!nntp.primenet.com!ddsw1!news.mcs.net!in-news.erinet.com!bug.rahul.net!rahul.net!a2i!ns2.mainstreet.net!sloth.swcp.com!news.dgsys.com!news.getnet.com!usenet
From: [e-mail] (Jim Gyer)
Newsgroups: rec.radio.amateur,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: HELP: IS PC SWITCHING POWER SUPPLY OK???
Date: Mon, 02 Sep 1996 02:14:37 GMT
Organization: Just my little old self
Lines: 50
Message-ID: <50dhf1$[e-mail]>
References: <4ulu2o$[e-mail]> <4vb581$[e-mail]>
NNTP-Posting-Host: ax3-p22.getnet.com
X-Newsreader: Forte Free Agent 1.0.82
Xref: news2.epix.net rec.radio.amateur.equipment:32105 rec.radio.amateur.homebrew:16626 rec.radio.amateur.misc:106420

No problem with switchers per se, but pirateing a computer supply is
not without its problems.

All switchers require a minimum load.  In many computer supplies its
the fan.  Some assume some minimum load on the mother board.  They go
out of regulation or stop oscillating and smoke with less than the
minimum current draw.

My ICOM IC740 has the optional built-in 13.8 volt supply and it works
fine but it was designed for communications.

There is a big difference between 12 volts and 13.8 volts.  In the
case of my Radio Shack HTX-202 2 meter handy-talky it's 6 Watts at
13.8 and 5 W at 12.0.  That's a 20% drop in power.  Most mobile
equipment assumes a vehicle with a running alternator which is where
the 13.8 value comes from.

Best
Jim Gyer KC7RKL ([e-mail])
====================================================================

[e-mail] (Bry) wrote:

>The other bad problem with many of those old switcher power supplies is
>that they generate a lot of RF hash!

>[e-mail] (Big Boy) scribbled:

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

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

>|E-mail me on that please...

>|Thanks and 73 to all readers

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

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




From [e-mail] Thu Sep 05 20:42:32 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!nntp.hk.super.net!tst.hk.super.net!usenet
From: "[e-mail]" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: homebrew modem for HT
Date: Wed, 04 Sep 1996 15:04:30 -0700
Organization: Hong Kong SuperNET
Lines: 4
Message-ID: <[e-mail]>
NNTP-Posting-Host: gcn.gov.hk
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0 (Win16; I)

I am looking for information (circuit or PCB) on homebrewing a packet
modem for my 2m handheld.

Thank you.


From [e-mail] Thu Sep 05 20:42:33 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-fw-22.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!news.clark.net!noos.hooked.net!nntp04.primenet.com!nntp.primenet.com!howland.erols.net!newsfeed.internetmci.com!metro.atlanta.com!news.radio.org!wa4mei!ke4zv!gary
From: [e-mail] (Gary Coffman)
Subject: Re: Homebrewing for the less-than-affluent (was: "Commercial CW use")
Message-ID: <[e-mail]>
Reply-To: [e-mail] (Gary Coffman)
Organization: Destructive Testing Systems
References: <[e-mail]> <[e-mail]> <[e-mail]>
Date: Mon, 2 Sep 1996 17:44:34 GMT
Lines: 62

In article <[e-mail]> [e-mail] (Jo
e Pritchard) writes:
>Tovar <[e-mail]> wrote:
>
>>So what are my options?  Is there much that one can do in the RF realm
>>without a lot of money or learning CW first?

Pardon me for following up Joe's message, but the original didn't
make it here. Let me address what one can do without learning CW
first. In a short sentence, the answer is "anything you wish outside
of HF." Current regulations limit you to only receiver, accessory,
and antenna projects for HF if you don't pass a Morse test, IE no
transmitting. While those things are interesting in and of themselves,
they're more SWL than amateur radio. Above 30 MHz, however, the whole
world of amateur radio is open to you.

With little money and little or no test equipment, the easiest
projects revolve around FM equipment. The receivers are easy
because they run wide open hard limiting. So they are easier
to tame and tune up than SSB/CW receivers. And most of the guts
are available as a chip or two. FM transmitters are similarly
easy, just a carrier source with a varactor across the oscillator
fed by a mic preamp. Simple, almost foolproof. For both FM receivers
and FM transmitters, your ears are the most important piece of test
equipment. You tune them until they sound good. Simple.

Of course there is more to it than that if you're shooting for
high performance, but you can certainly build equipment adequate
for local use with little in the way of tools and test equipment.
Even for high performance, a pulsed noise source is easy to build,
and about as useful as a $20,000 network analyser for tuning up
a preamp. You don't have to memorize an arcane coding either,
plain language English will do.

At 70cm and above, it gets even simpler. Most designs can use
printed lines for the tuned circuits. These "no tune" radios
are almost foolproof. Solder on the MMICs and DBMs and start
operating.

At microwave, your primary tools are saws, files, and very finely
marked rulers. For most projects, exotic test equipment isn't
needed. You can have a 10 GHz station on the air in an hour
if you happen to have a utility audio amplifier lying around.
It'll be useful up to 1/4 to 1/2 mile. You can have an even
better station if you happen to have an old portable broadcast
FM receiver lying around. That'll give you enough gain and
selectivity to work 10s of miles over the right terrain using
the gunnplexer and a simple dish made from an ordinary  snow
coaster, a big kitchen pot lid can be made to work too.

Homebrew gets *easier* as you go up in frequency. Since low
power is plenty for line of sight, costs are low too. HF
circuits are a pain in the butt to work with, save them
until you have more experience. Get up where the waves
are ultrashort and the building is easy. And remember
that with FM there is no static at all.

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


From [e-mail] Thu Sep 05 20:42:34 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!hunter.premier.net!www.nntp.primenet.com!nntp.primenet.com!netcom.com!tgm
From: [e-mail] (Thomas G. McWilliams)
Subject: Re: Impedance Match
Message-ID: <[e-mail]>
Organization: Jot-Em Down Store and Library
X-Newsreader: TIN [version 1.2 PL1]
References: <[e-mail]>
Date: Thu, 5 Sep 1996 05:29:51 GMT
Lines: 14
Sender: [e-mail]

[e-mail] wrote:
: I am looking for a means to match a series tuned coil with an impedance of 1

: ohm at resonance to the imput impedance of a NE602 mixer which is 3k. The
: frequency range is 30 Khz to 150 Khz. From what I can determine is that this

: is not an easy match and needs to be extremely compact. Any advice will be
: appreciated.

I guess you are saying that you want to match a voltage generator with
1 ohm impedance to the 3k ohm input of the NE602? I don't think you
need to match impedance, assuming the voltage source is sufficient
in amplitude. It would help to know what you are trying to do exactly.

[e-mail]



From [e-mail] Thu Sep 05 20:42:35 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!nntp04.primenet.com!nntp.primenet.com!ddsw1!news.mcs.net!van-bc!n1van.istar!van.istar!west.istar!ott.istar!istar.net!tor.istar!east.istar!virginia.bmts.com!primeline.net!tait
From: Gary Tait <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: info: CB to 10 conv.
Date: Mon, 2 Sep 1996 19:44:40 -0400
Organization: Bruce Municipal Telephone System
Lines: 12
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ns.primeline.net
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
To: Rick Perry <[e-mail]>
In-Reply-To: <[e-mail]>

That is pretty well it, just be sure to change th crystal that converts
the vco output to the input on the PLL ic.

Gary Tait , VE3VBF

On Mon, 2 Sep 1996, Rick Perry wrote:

> To convert a PLL type CB 23 Channel radio to 10 meters, is all you do is
> replace the Xtal in the PLL and retune?  Is there a band plan that is
> used like the old 73 band plan whch would effect the choice of crystals?
> Rick, KG7A



From [e-mail] Thu Sep 05 20:42:35 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!cam-news-hub1.bbnplanet.com!howland.erols.net!mcsun!EU.net!enews.sgi.com!decwrl!pa.dec.com!depot.mro.dec.com!mrnews.mro.dec.com!asic.enet.dec.com!randolph
From: [e-mail] (Tom Randolph)
Newsgroups: rec.radio.amateur.homebrew
Subject: Low-noise RF power transistor?
Date: 5 SEP 96 11:34:44
Organization: Digital Equipment Corporation
Lines: 11
Message-ID: <50msh6$[e-mail]>
NNTP-Posting-Host: bootnd.enet.dec.com


I need recommendations for a good, cheap, low-noise, readily available RF
power transistor. This will be the post-mixer IF amp in the receiver I'm about
to begin building, 12 MHz IF. It needs to be able to dissipate around 1W, cuz
I'm gonna run it with plenty of collector current to keep IMD low (this thing
won't last long on battery power!). All I have in the junk box is 2N3866, but
I'm sure there must be better transistors by now!

==============================================================================
Tom Randolph  N1OOQ  NE-QRP 419  QRP-L 87  ARRL     [e-mail]
==============================================================================


From [e-mail] Thu Sep 05 20:42:37 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-atl-21.sprintlink.net!newsfeeder.servtech.com!news1.io.org!newsfeed.direct.ca!op.net!www.nntp.primenet.com!nntp.primenet.com!news.sgi.com!enews.sgi.com!decwrl!venus.sun.com!news2me.EBay.Sun.COM!newsworthy.West.Sun.COM!news70.West.Sun.COM!myers
From: [e-mail] (Dana Myers)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Low-noise RF power transistor?
Date: 5 Sep 1996 18:27:17 GMT
Organization: SunSoft South, Los Angeles, CA
Lines: 48
Message-ID: <50n625$[e-mail]>
References: <50msh6$[e-mail]>
NNTP-Posting-Host: sunspot.west.sun.com

In article <50msh6$[e-mail]>,
Tom Randolph <[e-mail]> wrote:
>
>I need recommendations for a good, cheap, low-noise, readily available RF
>power transistor. This will be the post-mixer IF amp in the receiver I'm abou
t
>to begin building, 12 MHz IF. It needs to be able to dissipate around 1W, cuz
>I'm gonna run it with plenty of collector current to keep IMD low (this thing
>won't last long on battery power!). All I have in the junk box is 2N3866, but
>I'm sure there must be better transistors by now!

Well, you've got several factors to consider.

First of all, the amount of bias power in a transistor does influence
the IP3/IMD performance, but, for every transistor, there is a point
where you stop gaining improved IP3 for increased bias power.  So,
for any transistor you select, the bias point should be selected
for the best IP3, not based on some pre-conceived notion of
bias level.

The desire for low noise is almost certainly going to trade-off
against the necessity for good mixer termination (assuming you use
a mixer that requires good termination).  You can't just select
a transistor on the basis of NFopt (the optimal noise figure), since
this represents the best possible performance, usually at a
significant mis-match.  You need to evaluate transistors in
a circuit which meets the requirements, and you'll find that
even very low-noise parts aren't that important.

Is a "low noise" stage *really* necessary here?  Have you done a
cascade noise/gain analysis on the proposed receiver?  My personal
slant is to distribute gain and loss in the front end in such a
way that most of the system gain comes after the first IF 'roofing'
filter.  The post-mixer amplifier really exists to provide good
termination for the mixer and compensate for loss in the IF roofing
filter.

I'd suggest that the classic 2N5109 stage, biased at something
like 50mA/8Vce, with a gain of 10dB or so is probably more than
enough.  If the system NF isn't good enough, try using a strong
low-noise RF amplifier before the mixer.  In any event, CATV transistors
are the low-IMD parts, since cable TV consists of a great number of
signals just eager to mix.

--
 * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are mine and should *
 * [phone]               | not be interpreted or represented as     *
 * [e-mail]      | those of Sun Microsystems, Inc.          *



From [e-mail] Thu Sep 05 20:42:37 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!holonet!colossus.holonet.net!atdbbs!clint.bradford
From: [e-mail] (Clint Bradford)
Newsgroups: rec.radio.amateur.homebrew
Subject: Macintosh Software
Date: Wed,  4 Sep 1996 04:26:00 GMT
Message-ID: <[e-mail]>
Organization: ATTENTION to Details BBS - Mira Loma, CA
Distribution: world
References: <[e-mail]>
Lines: 22


>>There is plenty of radio software around for PC (IBM) computers. Does
>>anyone know of a good source of Macintosh "radio" software. Anything
>>from Morse converters to ...antenna design.... scanner control.etc..

Although primarily an IBM BBS, ATTENTION to Details BBS has a MAC
Amateur Radio Software File Area! And there's an easy way to get the
list of MAC files, too!

Just sent a piece of EMail to:     [e-mail]

Use any SUBJECT you like.

And write the KeyWord:             MAC-HAM

as the ONLY word in the FIRST LINE of your message. You will receive a
textfile via return EMail with all they have to offer for MAC Amateurs!


[e-mail]
---
 * TLX v4.00 * ATTENTION to Details AMATEUR RADIO BBS - 909/681-6221


From [e-mail] Thu Sep 05 20:42:38 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!brighton.openmarket.com!decwrl!chronicle.adobe.com!enquirer.corp.adobe.com!news
From: Stephen Schiller <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Microwave Diodes
Date: Wed, 04 Sep 1996 17:22:36 -0700
Organization: Adobe Systems Inc.
Lines: 29
Message-ID: <[e-mail]>
References: <503lqp$[e-mail]> <507e8l$[e-mail]>
NNTP-Posting-Host: shipboard.corp.adobe.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.02 (WinNT; I)
CC: [e-mail]

Tom Bruhns wrote:
>
> Chris Jones ([e-mail]) wrote:
> :     As an experimenter, I would like to get my hands on a
> : diode that could rectify 20, 50 or even 100 GHZ microwaves.
> :  Are there any commercially available?
>
> Get ahold of the HP Communications Components catalog.  The
> HSCH-9101 GaAs Beam Lead Schottky Barrier Diode is rated for
> use through 44GHz and I'd be surprised if you couldn't get
> it to give some useable rectification well above that.  They
> are kinda small and might be a challenge for the typical
> experimenter to actually use.  I have no idea what they cost.

I have seen some HP beam lead devices in the Newark Electronics catalog
for $15 to $30 each. But for really high frequency nothing beats
the "old fashion" germanium point contact diodes. They can detect
up to 300GHz, but I don't know the details. Just read that in
a book on microwave measurement techniques. For example, I am
not sure if the 1N23 diodes you find in old waveguide detectors
will go this high or not. They certainly wont give a good 50 ohm
match at that frequency.

General hint for this kind of thing: use a dipole antenna tuned to
the frequency of interest to increase your sensitivity.

 - S

 - S


From [e-mail] Thu Sep 05 20:42:39 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-fw-12.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!news.infi.net!imci5!pull-feed.internetmci.com!newsfeed.internetmci.com!howland.erols.net!cs.utexas.edu!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Bud Simciak)
Newsgroups: rec.radio.amateur.homebrew
Subject: Motorola Expo to Two Meters
Date: 3 Sep 96 14:53:44 GMT
Organization: Hand Held Products, Inc.
Lines: 11
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]


Text item: Text_1

     Has anyone converted the Expo to operation on two meters (voice)?
     What is the crystal frequency formulas?

     I have a full compliment of test equipment but would love to get any
     info available.

     Thanks, Bud  W4HXP



From [e-mail] Thu Sep 05 20:42:40 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.nevada.edu!news.tamu.edu!news.sgi.com!swrinde!cs.utexas.edu!howland.erols.net!spool.mu.edu!news.cs.indiana.edu!mcmcnews.er.usgs.gov!news.er.usgs.gov!stc06.ctd.ornl.gov!zaek25.ymd.ornl.gov!uid
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Motorola Expo to Two Meters
Date: Wed, 4 Sep 1996 18:11:11 GMT
Organization: Oak Ridge National Lab, Oak Ridge, TN
Lines: 33
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: zaek25.ymd.ornl.gov
X-Newsreader: Trumpet for Windows [Version 1.0 Rev A]

In article <[e-mail]> [e-mail] (Bud Simciak)
 writes:
>Path: stc06.ctd.ornl.gov!fnnews.fnal.gov!uwm.edu!cs.utexas.edu!swrinde!ihnp4.
ucsd.edu!news1.ucsd.edu!news-mail-gateway
>From: [e-mail] (Bud Simciak)
>Newsgroups: rec.radio.amateur.homebrew
>Subject: Motorola Expo to Two Meters
>Date: 3 Sep 96 14:53:44 GMT
>Organization: Hand Held Products, Inc.
>Lines: 11
>Message-ID: <[e-mail]>
>NNTP-Posting-Host: mail.ucsd.edu
>Originator: [e-mail]



>Text item: Text_1

>     Has anyone converted the Expo to operation on two meters (voice)?
>     What is the crystal frequency formulas?
>
>     I have a full compliment of test equipment but would love to get any
>     info available.
>
>     Thanks, Bud  W4HXP
>

The VHF Expo was manufactored in three band spacings. 136-150.8 Mhz, 150.8-a62

Mhz, and 162-174 Mhz. They will not work very well outside these band
spacings. Also, the Expo's I work on are very bad about frequency drifting and

require either a jig for calibration, or old case with holes bored in it to
get to the calibration points, or a whole lot of taking it in and out of its
case and making frequency adjustments.

                                             Danny Britton


From [e-mail] Thu Sep 05 20:42:41 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-chi-13.sprintlink.net!demos!news1.relcom.ru!EU.net!enews.sgi.com!news.sgi.com!swrinde!cs.utexas.edu!newshost.convex.com!cnn.exu.ericsson.se!eua.ericsson.se!erinews.ericsson.se!usenet
From: [e-mail] (Christer Jogenborn)
Newsgroups: rec.radio.amateur.homebrew
Subject: Remote RX-How TO?
Date: 2 Sep 1996 12:40:30 GMT
Organization: Ericsson
Lines: 15
Message-ID: <50ekju$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: kicc16.eraj.ericsson.se

Want to assemble a remote controlled RX site.
Looking for ideas on 'how to', that is - what
receivers, interfaces, computer programs, bits of HW, is
available and can be used together to form the remote RX.
Are there previous ham-mag. articles or sites to study?

The idea in general is to use an FM control channel to the
remote RX site, the 'users' need to have DTMF.
The remote RX audio should be availabel on FM audio channel.
No restriction is neccessary on users, although an 'access code'
to activiate the RX should be of interest.
Have ICOM R7 RX, but other RXs can be discussed.
--
Chris SM0NCL



From [e-mail] Thu Sep 05 20:42:42 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-atl-21.sprintlink.net!tezcat!cam-news-hub1.bbnplanet.com!howland.erols.net!newsfeed.internetmci.com!news-out.microserve.net!news-in.microserve.net!news
From: [e-mail] (Steven Kerns)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: SS Homebrew Projects?
Date: 1 Sep 1996 00:05:48 GMT
Organization: Penn Biomedical Support, Inc.
Lines: 37
Distribution: world
Message-ID: <50ak0s$[e-mail]>
References: <509ter$[e-mail]>
NNTP-Posting-Host: ppp15.talon.net
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.7

Marty,

Try the ARRL Spread Spectrum Sourcebook, there is some info on home brewing.

What band are you building in and what are you using it for (data or voice)?
Many IC manufactures (Harris, Motorola, etc) are just coming out with chip
sets for SS.  All of these chip sets are for data transmission in the 902 or
2.4 Ghz band but you could up or down convert to the RF band of your choice.
Harris has a site on the WWW...

Have fun, keep up the home brewing!

Steven Kerns N3FTI
Penn Biomedical Support, Inc.


In article <509ter$[e-mail]>, [e-mail] says...
>
>Hello, Folks:
>
>Anyone know of any sources for homebrew projects for Spread Spectrum?
>
>Take Care & 73
>
>
>
>Marty Albert - [e-mail]
>Amateur Radio: KC6UFM@KC6UFM.#SEMO.MO.USA.NOAM
>
>Heartland Internet Services
>
>*****************************************************
>Are you paying too much for Long Distance?
>http://freedomstarr.com/?AL7837318
>*****************************************************
>



From [e-mail] Thu Sep 05 20:42:43 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!laslo.netnet.net!en.com!in-news.erinet.com!bug.rahul.net!rahul.net!a2i!samba.rahul.net!rahul.net!a2i!news.walltech.com!uunet!in3.uu.net!newsfeed.internetmci.com!howland.erols.net!surfnet.nl!news.nic.utwente.nl!paul
From: [e-mail] (Paul Boven)
Newsgroups: sci.electronics.design,rec.radio.amateur.homebrew
Subject: Stripline 10GHz varactor oscilator design?
Date: 3 Sep 1996 13:40:59 GMT
Organization: University of Twente, Enschede, The Netherlands
Lines: 16
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: wit387304.student.utwente.nl
X-Newsreader: slrn (0.8.8.4 (BETA) UNIX)
Xref: news2.epix.net sci.electronics.design:11333 rec.radio.amateur.homebrew:16612

Hi everyone,

I'm very interested in finding a design for an X-band (10GHz) stripline
transistor-source, with a varactor for PLL-ing and frequency modulation.
I'm planning to use this as a building block in an X-band AX25-interlink,
with a high baudrate (10Mb/s). Postscript-layouts with parts-list would
be extremely welcome ;) But also any other information you might have.

Regards, 73, Paul Boven.
--
----------------------------------------------------------------------
Paul Boven, <[e-mail]>  PE1NUT  QRV 145.575 JO32KF
 "Read some Kerouac,  and it put me on the tracks,  to burn a little
    brighter now"    - Torch song, Clutching at straws, Marillion.
----------------------------------------------------------------------



From [e-mail] Thu Sep 05 20:42:45 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!newsfeed.internetmci.com!dsm6.dsmnet.com!usenet
From: [e-mail] (Dean T. Miller)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Tubes, fer cryin' out loud! Them's tubes, Martha!
Date: 4 Sep 1996 06:53:43 GMT
Organization: Miller and Associates
Lines: 22
Message-ID: <[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: slppp02.dsmnet.com
X-Newsreader: OUI TE 1.5

Hi Nils,

In article <[e-mail]>, From
[e-mail], the following was written:
> I'd like to build a 30m tube transmitter and a matching 30m
> regen receiver with one stage of audio amplification. I think
> I can do that with the three working 6V6s and the 1625. Or
> really go loonie and use the 829 B. I think that's it. The
> single-envelope dual-pentode with internal self-neutralization.
> Came out of a surplus rig, now that I think of it. And
> I still have that ART13 down in the basement. Hmmm.....

But where would you get the high voltage (not to mention filament)
transformers these days??<BG>

--
Dean T. Miller [e-mail]
09/04/96 01:55
---------
 -- Dean -- from Des Moines  ----  Using: OUI TE 1.5 from http://www.dvorak.co
m




From [e-mail] Thu Sep 05 20:42:48 1996
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From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Tubes, fer cryin' out loud! Them's tubes, Martha!
Date: 5 Sep 1996 08:31:17 GMT
Organization: Edmonton FreeNet, Edmonton, Alberta, Canada
Lines: 68
Message-ID: <50m34l$[e-mail]>
References: <[e-mail]> <[e-mail]>
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X-Newsreader: TIN [version 1.2 PL2.5]

Dean T. Miller ([e-mail]) wrote:
: Hi Nils,

: In article <[e-mail]>, From
: [e-mail], the following was written:
: > I'd like to build a 30m tube transmitter and a matching 30m
: > regen receiver with one stage of audio amplification. I think
: > I can do that with the three working 6V6s and the 1625. Or
: > really go loonie and use the 829 B. I think that's it. The
: > single-envelope dual-pentode with internal self-neutralization.
: > Came out of a surplus rig, now that I think of it. And
: > I still have that ART13 down in the basement. Hmmm.....

: But where would you get the high voltage (not to mention filament)
: transformers these days??<BG>

: --
: Dean T. Miller [e-mail]
: 09/04/96 01:55
: ---------
:  -- Dean -- from Des Moines  ----  Using: OUI TE 1.5 from http://www.dvorak.
com



--High voltage trafos are a problem.  If you can't scrape up an old one,
  from surplus or hamfests, you have some options:

    1) Antique Electronic Supply - sells Hammond replacement power trafos,
       complete with 5VAC and 6.3VAC filament windings.  Also sells
       vacuum tubes, RF chokes, power supply chokes, High-voltage caps,
       Hi-Z headphones, tube sockets, audio trafos, variable caps,
       radio restoration parts and supplies, and books.
       (Antique Electronic Supply, 6221 S. Maple Ave., Tempe, AZ, 85283,
        [phone] or FAX[phone] - catalog was free)

    2) Electronic wholesalers sell isolation trafos in various VA ratings,
       with 115VAC or 230VAC secondaries.  110VAC is sufficient for regens.
       230VAC is enough for a low powered 6V6 oscillator or MOPA rig.
       Radio Shack sells small transformers for low-voltage power supplies.
       These 12.6VAC secondaries are center-tapped for 6.3VAC.  Really, I
       guess they are filament trafos.

    3) The Radio Shack trafos can be wired back-to-back in pairs to achieve
       an isolation trafo with 110VAC secondary (Connect 12.6VAC secondaries
       in parallel, in-phase.  Use one trafo primary as the 110VAC
       secondary, take 6.3VAC for filaments from the tied-together windings.)

   ******************************************
  ** Shane <[e-mail]> **
   ******************************************
        ** Edmonton, Alberta, Canada **
         *****************************



















From [e-mail] Thu Sep 05 20:42:52 1996
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From: Robert Bissett <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Tubes, fer cryin' out loud! Them's tubes, Martha!
Date: Thu, 05 Sep 1996 02:31:31 -0400
Organization: Nov Schmoz Kapop
Lines: 32
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: ppp14.monmouth.com
Mime-Version: 1.0
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Content-Transfer-Encoding: 7bit
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To: [e-mail]

Dean T. Miller wrote:
>
> Hi Nils,
>
> In article <[e-mail]>, From
> [e-mail], the following was written:
> > I'd like to build a 30m tube transmitter and a matching 30m
> > regen receiver with one stage of audio amplification. I think
> > I can do that with the three working 6V6s and the 1625. Or
> > really go loonie and use the 829 B. I think that's it. The
> > single-envelope dual-pentode with internal self-neutralization.
> > Came out of a surplus rig, now that I think of it. And
> > I still have that ART13 down in the basement. Hmmm.....
>
> But where would you get the high voltage (not to mention filament)
> transformers these days??<BG>
>
> --
> Dean T. Miller [e-mail]
> 09/04/96 01:55
> ---------
>  -- Dean -- from Des Moines  ----  Using: OUI TE 1.5 from http://www.dvorak.
com

Visit your local TV repair shops and ask them to call you when they
have an old tube type TV to dump and  rip out the power transformer.
 Tips on using them in the ARRL handbooks.

Bob, ND2L
--
      *********
Bob Bissett      [e-mail]
      *********


From [e-mail] Thu Sep 05 20:42:54 1996
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From: [e-mail] (Jim Gyer)
Newsgroups: sci.electronics.components,sci.electronics.basics,rec.radio.amateur.homebrew
Subject: Re: What is a Gunn diode ?
Date: Mon, 02 Sep 1996 01:36:29 GMT
Organization: Just my little old self
Lines: 75
Message-ID: <50df7j$[e-mail]>
References: <4vhlep$[e-mail]> <4vjfpn$[e-mail]> <[e-mail]>
NNTP-Posting-Host: ax3-p22.getnet.com
X-Newsreader: Forte Free Agent 1.0.82
Xref: news2.epix.net sci.electronics.components:7178 sci.electronics.basics:7893 rec.radio.amateur.homebrew:16628

A device used at the airport to detect weapons?

I disagree with Douglas J. Mar ([e-mail]) below.  If
you plot the voltage across a tunnel diode against the current through
it, there is a area where the slope is negative.  That is: take two
points one described by I1 at V1 and the other by I2 at V2 and solve
for resistance using the equation R = (V1-V2)/(I1-I2).  The result is
negative.  This equation will always produce a positive result for
conventional resistors.  This is not nit picking or playing at
semantics - it's a matter of mathamatical definition.

It is also required that the resistance be negative from the following
line of reasoning:  A normal resistor can only disipate power - it can
only produce a loss.  No way to get gain out of a resistor.  Just as a
positive resistance produces loss, a negative resistance produces
gain.  (That's how the circuits he mentions work.  It's just that a
tunnel diode does the same thing in a simple two terminal device.)
Tunnel diodes produce gain.  They can be used as amplifiers.  They can
also be used in oscillator circuits.  To oscilate, a circuit must have
at least enough gain to overcome its losses.  Since no real circuit
can be lossless, and oscilator must contain a gain element.

I think a way to include his point is to realize that all active
circuits consume more power than they produce as output.  They have
less than 100% effiency.  (Otherwise we would have perperual motion
machines.)  The diode consumes real positive power a part of which is
disipated in internal (positive) resistance loss and part is turned
into output by a negative resistance.

Now, what's a gun diode?  Don't know beyond Doug's comment that it's
an active device used at microwave frequencies.  Gunn is the name of
its inventor.  Now aren't you sorry you asked?

Best
Jim Gyer KC7RKL (docjim @getnet.com)
=======================================================================
[e-mail] (Douglas J. Mar) wrote:

>In article <4vjfpn$[e-mail]>, [e-mail]
>(Steve J. Noll) wrote:

>> [e-mail] (Marcin Skubiszewski) wrote:
>>
>> >The subject says it all.
>>
>> >Is there a negative resistance region in these diodes, as in tunnel diodes
 ?
>>
>>
>> Yes.

>Agreed.

>Nitpick: the term should probably be "negative differential resistance" or
>  "negative incremental resistance", for both Gunn and tunnel diodes, since
>  the slope of the I-V curve is always positive.  The "negative resistance"
>  region is that over which the resistance _decreases_ for increasing bias,
>  but it still remains positive.  (It's possible to use active devices to
>  construct a negative resistance (or impedance).

>Gunn diodes are used in oscillators at microwave frequencies.


>DM
>+------------------------------------------------------------------------+
>|  Douglas J. Mar                               [e-mail]  |
>|  Materials Physics Branch, Code 6343          202-767-6244 (office)    |
>|  Naval Research Laboratory                    202-767-6295 (lab)       |
>|  4555 Overlook Avenue SW                      202-767-1697 (fax)       |
>|  Washington DC 20375-5000                     Bldg 3, Room 409         |
>+------------------------------------------------------------------------+
>|  The views expressed above do not necessarily reflect those of U.S.    |
>|  Government, the Department of Defense, the Navy, or my wife.          |
>+------------------------------------------------------------------------+




From [e-mail] Thu Sep 12 16:46:32 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!coopnews.coop.net!csnews!boulder!agate!howland.erols.net!surfnet.nl!eur.nl!popeye.eur.nl!mstore.eur.nl!129432pd
From: Peter Dingemans <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Tubes, fer cryin' out loud! Them's tubes, Martha!
Date: Fri, 6 Sep 1996 13:13:49 -0900
Organization: Erasmus Universiteit Rotterdam
Lines: 22
Message-ID: <Pine.PCN.3.91.960906130855.7898B-100000@[130.115.53.78]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: pcz-b18.edu.few.eur.nl
Mime-Version: 1.0
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X-Sender: [e-mail]
In-Reply-To: <[e-mail]>

G'day,

On 4 Sep 1996, Dean T. Miller wrote:


> But where would you get the high voltage (not to mention filament)
> transformers these days??<BG>

If you have a lot of spare time, you can of course wind them yourself...
I usually do this, since it saves a lot of money as compared to buying
them, even when you buy in dump-stores. I usually buy my heavy
transformers at non-ham flea-markers, so they usually cost no more than 1
or 2 US$. (paid 2$ for a 750W transformer). However, it usually takes a
while to wind, even with a home-made winding-machine (very simple, hand
driven). In my neighbourhoud there's a transformer/electromotor
winding-shop, which can do the job for about 60$. When I do it myself, it
takes me about 3 days of 8 hours (on a 500W transformer) of boring work,
but then you have a trafo exactly as you wish it, i.e. with 'extra'
voltages, filament, grid, screen voltages, etc.

Hope this has been of help,



From [e-mail] Thu Sep 12 16:46:36 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!newsfeed.internetmci.com!news.sprintlink.net!news-stk-200.sprintlink.net!news.callamer.com!spork.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Commercial CW use
Date: Wed, 4 Sep 1996 17:58:44 -0700
Organization: Call America Internet Services  [phone]
Lines: 30
Message-ID: <[e-mail]>
References: <[e-mail]> <50keb2$[e-mail]>
NNTP-Posting-Host: spork.callamer.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Sender: [e-mail]
To: Brad Wyatt <[e-mail]>, Fried Heyn <[e-mail]>,
    TIEMANN BRUCE <[e-mail]>
In-Reply-To: <50keb2$[e-mail]>

I fully agree that the 1750 meter band should be left alone BUT with a
power increase to some nominal value between ten and one hundred watts.  I
have been running a BPSK beacon on 187.65 for years emulating what has
been done for submarines.  We do not need any further restrictions---even
those created by ham bands as no restrictions exists now!  Cliff K7RR

On 4 Sep 1996, TIEMANN BRUCE wrote:

>
> "Speaking of VLF;  I hope the FCC doesn't move the 1750m band (160-190kHz)
> from Part 15 to Part 97.  Limited transmissions are currently allowed
> without a license at 1750 meters, and experimenters have developed advanced
> techniques to deal with this noisy band.  It would be a shame if this
> became an amateur band that was restricted to licensed Morse code junkies.
>
> Paul, KC7CKU"
>
> I agree it shouldn't be *restricted* to CW junkies.  However, I am all in
> favor of changing the rules to permit more than 1 watt input and more than
> 15 m of transmission line + antenna + ground lead combined.  If they *need*
> to give us a CW test for that, fine.  But let the part-15ers be.
>
> FWIW I'm an Extra who sees both the enjoyment in using, and also the
> silliness in requiring, CW.
>
> Bruce
> N6URH
>
>



From [e-mail] Thu Sep 12 16:46:37 1996
Path: news2.epix.net!news3.epix.net!uunet!in2.uu.net!hunter.premier.net!news1.erols.com![e-mail]
From: Steve Ickes <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 4CX250B as GG TRIODE amp ???
Date: Fri, 06 Sep 1996 05:27:55 -0700
Organization: WB3HUZ in Baltimore
Lines: 43
Message-ID: <[e-mail]>
References: <[e-mail]> <50k8k9$[e-mail]>
NNTP-Posting-Host: col-as18s30.erols.com
Mime-Version: 1.0
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W8JI Tom wrote:
>
> In article <[e-mail]>, Larry Minnis <[e-mail]>
> writes:
>
> >Bill Orr, W6SAI, has such an amp in his Radio Handbook, 17th edition,
> >on page682. He has the tubes configured as low-mu triodes. If he says
> >it can be done, I for for one would believe him. Larry, WB6VGI.
> >
>
> I wouldn't without careful consideration of potential problems. All
> suggestions you might find in books aren't always good.
>
> One of Orr's "favorite" tactics is connecting the control grid to the
> cathode. He suggests doing this in sweep tube amps even though it results
> in feedback levels that de-stabilize the amplifier and send IMD through
> the ceiling.
>
> Anyone owning a Dentron GLA1000 or an Amp Supply LA-1000 can see this
> problem... just set the amp to 15 or ten meters open the input port and
> tune the tank to resonance with the loading control meshed. The amp will
> oscillate like crazy. Measure IMD performance and it is over seven dB
> worse with the cathode and grid connected, as opposed to conventional "all
> grids grounded" operation.
>
> When cathode driven, the control grid is the primary shield between the
> input and output. The control grid belongs at low RF potential to ground.
>
> When tubes are designed great care is taken in grid design to be sure IMD
> is acceptable. Changing the mode of operation by not using the grid
> designed to do the control function, and exciting the grid designed to be
> operated at a high dc potential,  might not be the best idea if distortion
> is a concern.
>
> 73 Tom

Orr wrote an article in QST back in the 60's on cathode driving 4cx  type
tubes.  He did not suggest triode connection but rather what he called
super cathode drive.  It involves feeding some drive to the grid as well
and includes RF feedback ala Collins linears.  According to the article,
drive requirements are increased (lower stage gain) and IMD reduced.

S


From [e-mail] Thu Sep 12 16:46:38 1996
Path: news2.epix.net!news3.epix.net!uunet!in2.uu.net!insync!news.azstarnet.com!usr1ip6.azstarnet.com!n7ws
From: [e-mail] (Wes Stewart)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 4CX250B as GG TRIODE amp ???
Date: Fri, 6 Sep 1996 07:00:51 LOCAL
Organization: StarNet
Lines: 20
Message-ID: <[e-mail]>
References: <[e-mail]> <50k8k9$[e-mail]> <[e-mail]>
NNTP-Posting-Host: usr1ip6.azstarnet.com
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4]

In article <[e-mail]> Steve Ickes <[e-mail]> w
rites:
>From: Steve Ickes <[e-mail]>
>Subject: Re: 4CX250B as GG TRIODE amp ???
>Date: Fri, 06 Sep 1996 05:27:55 -0700



>Orr wrote an article in QST back in the 60's on cathode driving 4cx  type
>tubes.  He did not suggest triode connection but rather what he called
>super cathode drive.  It involves feeding some drive to the grid as well
>and includes RF feedback ala Collins linears.  According to the article,
>drive requirements are increased (lower stage gain) and IMD reduced.

>S

The article was, "Semi- and Super-Cathode Driven Amplifiers" by Orr and Sayer,

QST, July 1967.

73, Wes -- N7WS



From [e-mail] Thu Sep 12 16:46:42 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!insync!news.azstarnet.com!usr1ip33.azstarnet.com!n7ws
From: [e-mail] (Wes Stewart)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 4CX250B as GG TRIODE amp ???
Date: Wed, 4 Sep 1996 23:10:37 LOCAL
Organization: StarNet
Lines: 39
Message-ID: <[e-mail]>
References: <[e-mail]> <4vtqht$[e-mail]> <[e-mail]>
NNTP-Posting-Host: usr1ip33.azstarnet.com
X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4]

In article <[e-mail]> Larry Minnis <[e-mail]> writes:
>From: Larry Minnis <[e-mail]>
>Subject: Re: 4CX250B as GG TRIODE amp ???
>Date: Sun, 01 Sep 1996 17:49:54 -0700

>W8JI Tom wrote:
>>
>> In article <[e-mail]>, [e-mail]
>> (Chris Scott) writes:
>>
>> >Anyone done this?
>> >
>> >WB9NEQ
>>
>> The contrl grid of the 250 is too fragile, and grid spacings are not
>> correct for zero bias GG operation. You can use the tube cathode driven,
>> but will still need screen and bias voltages.
>>
>> The screen must be very well regulated, or IMD will be unpredictable.
>>
>> Three or four hundred ohms of grid swamping is too high, unless you plan
>> on driving the tubes with less than a few watts.
>>
>> 73 TomBill Orr, W6SAI, has such an amp in his Radio Handbook, 17th edition,
>on page682. He has the tubes configured as low-mu triodes. If he says
>it can be done, I for for one would believe him. Larry, WB6VGI.

Careful here. I don't have the 17th edition, but I do have the 22nd and it has

an amplifier design just as Tom suggests. Cathode-driven with normal grid and
screen bias applied.

Also note, most of the circuits in these books are stolen from somebody else,
(I know, I'm one of them) and have not necessarily been approved (or proved)
by either Bill Orr or EIMAC.

73, Wes N7WS





From [e-mail] Thu Sep 12 16:46:43 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!tank.news.pipex.net!pipex!arclight.uoregon.edu!voskovec.radio.cz!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!EU.net!sun4nl!Leiden.NL.net!Utrecht.NL.net!knoware.nl!sys3.pe1chl!rob
From: [e-mail] (Rob Janssen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: A not so obvious resistor question.
Date: Fri, 6 Sep 1996 14:06:51 GMT
Organization: PE1CHL
Lines: 20
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References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: pe1chl.knoware.nl
X-Newsreader: NN version 6.5.0 (NOV)

In <[e-mail]> [e-mail] (Dave Kirkby) wri
tes:

>I need a resistor of 10 Ohms in series with the anode supply to a tube taking
 2A
>max. Hence the resistor needs to be 40 W. However, in the event of a tube arc
, I
>do not want the resistor to fuse, so it must take the full HT (5kV) for a sho
rt time.
>This imples it must dissipate 500,000 W. Clearly, I'm not going to buy a 500
kW
>resistor, so I'm wondering what is the best choice to find a resistor(s) to w
ithstand
>this without going bang. I have 3 options:

Ok, your power supply is apparently rated at 10kW  (5kV*2A) but is it
also capable of delivering 500kW (or 2.5MW when you calculate correctly)?

Probably the voltage will drop and the dissipation will be less.

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


From [e-mail] Thu Sep 12 16:46:43 1996
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From: norman <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: A not so obvious resistor question.
Date: 7 Sep 1996 19:20:09 GMT
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To: [e-mail]


Hey Dave....The rating on a resistor is continous.  I would put in a
regular 50 (or 100 watt) resistor. It will do the job and run cool. If
you have an arc over for a short time the resistor eill not "fuse".
If the plate supply is over current for very lonf the plate supply fuse
should go.

Norm  N8RGR



From [e-mail] Thu Sep 12 16:46:45 1996
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Newsgroups: rec.radio.amateur.homebrew
Subject: Re: A not so obvious resistor question.
Message-ID: <[e-mail]>
From: Jim Garland <[e-mail]>
Date: Thu, 05 Sep 1996 08:58:29 -0500
References: <[e-mail]> <[e-mail]>
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Dave Kirkby wrote:
>
> In article [e-mail], [e-mail] (Dave Kirkby) writes:
> > I need a resistor of 10 Ohms in series with the anode supply to a tube tak
ing 2A
> > max. Hence the resistor needs to be 40 W. However, in the event of a tube
arc, I
> > do not want the resistor to fuse, so it must take the full HT (5kV) for a
short time.
> > This imples it must dissipate 500,000 W. Clearly, I'm not going to buy a 5
00 kW
> > resistor, so I'm wondering what is the best choice to find a resistor(s) t
o withstand
> > this without going bang.

Actually, Dave, the calculation of the power rating of the resistor is a bit m
ore complicated
than estimating the peak power from V^2/R. As you noted, when the tube arcs, t
he full power
supply voltage drops across the resistor. As has already been noted, however,
unless you have
a HUMONGOUS power supply, the supply won't be able to supply the 500A of curre
nt to the
resistor. There are, in fact, two characteristic currents you need to consider
.

The first is the "steady-state" current, which is the current the supply can d
eliver in the
steady state when the output voltage is short-circuited to ground. This steady
-state value is
limited by the resistance of the transformer windings and the mutual inductanc
e between the
primary and secondary. This steady state current is probably in the range 10-5
0 amps.
However, a fuse or circuit breaker will (hopefully!) trip before the steady st
ate current is
reached, so the steady-state current is largely a theoretical consideration.

The other relevant current is the peak current delivered to the resistor when
the tube arc
occurs. This current is much higher than the steady-state current, and is caus
ed by the
stored energy in the filter capacitors discharging through your 10 ohm current
-limiting
resistor. The amount of stored energy is given by CV^2/2 (joules), where C is
the filter
capacitance and V is the (5KV) power supply voltage. This energy corresponds t
o a charge
stored on the capacitor of Q=CV (coulombs), and when the tube arc occurs, this
 charge decays
to ground through the 10ohm resistor with a time constant RC. A typical value
for RC would be
(30uF)(10ohms)=300usec

 The current associated with this discharge also decays exponentially through
the resistor
with the same time constant. The peak instanteous value of the current is give
n theoretically
by V/R, but because the time constant is so short, the actual instanteous curr
ent would be
reduced by the inductance of the power supply leads and other stray inductance
. I'm guessing
the actual peak current would be about 100-200A, but it would be in this range
 for less than
a millisecond.

As a practical matter, I normally use a 0.82-2.0 ohm 2Watt wire wound resistor
 for current
limiting purposes. The resistor explodes if a tube arc occurs, thus limiting d
amage to the
amplifier. I have also used a 50 ohm 50W wirewound resistor BEFORE the filter
capacitors, to
limit the charging current through the capacitor when the supply is first turn
ed on, but it
isn't really necessary if you use a (recommended) step-start circuit.

73,

Jim W8ZR


From [e-mail] Thu Sep 12 16:46:46 1996
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From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: A not so obvious resistor question.
Date: 6 Sep 1996 09:18:12 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 65
Sender: [e-mail]
Message-ID: <50p8ak$[e-mail]>
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>As a practical matter, I normally use a 0.82-2.0 ohm 2Watt wire wound
>resistor for current
>limiting purposes. The resistor explodes if a tube arc occurs, thus
limiting
>damage to the
>amplifier. I have also used a 50 ohm 50W wirewound resistor BEFORE the
filter
>capacitors, to
>limit the charging current through the capacitor when the supply is first
>turned on, but it
>isn't really necessary if you use a (recommended) step-start circuit.

There was some good info there , but don't follow this advice!!!!!!!!!

I  think that was the worse suggestion I've ever heard, short of using a
thin piece of wire as a fuse. The use of a fractional ohm to 2 ohm
resistor is incorrect in almost any application.

In a typical application using electrolytics, the ESR of the capacitors,
the choke resistance and inductance, and other circuit losses would make
the 2 watt resistor nothing but a very poor "fuse".... it most certainly
would NOT limit current. Just what do you think the big flash is from?
Until that sustained arc quits, the resistor is heavily conducting.

Let's look at a pratical example. One 3600 volt supply amplifier has a 6
ohm choke, and a typical minimum ESR of .6 ohms per electrolytic. It has
10.8 ohms of series resistance not including wiring and choke impedance.
The peak discharge pulse during an arc will be 200 amperes (or less) in
this example due to the accumulation of resistances and impedances, and
the addition of a 2 ohm resistor would mean a reduction of surge to 180
amperes or so. Big deal!!!

To add any meaningful protection the surge resistor would have to be a
minimum of ten ohms, and preferably something larger. Since the tube used
in it can generally take a brief discharge of a few hundred amperes
without permanent damge, everything is fine as is.

If the PA used a large oil capacitor and a larger plate choke,  the ESR
would be as low a fraction of an ohm. The surge current could easily
approach 1000 amperes with the suggested two ohm limiter.... that value is
useless to protect the tube. If the resistor vaporizes before the grid,
you're in luck. Maybe it will, maybe it won't.

Depending on a resistor explosion to shut the system down is not very
wise. Fuses are undependable enough for reliability and failure time when
overloaded, I'd hate to think of the reliability of a component designed
for a totally different application.

Using a Triac trigger to test small 2 watt resistors, I found some that
took a several hundred milliseconds to explode with a 1000 ampere surge.
There is actually such a large time lag between overload and explosion
resistors can explode AFTER the current dump has decayed!! Some protection
that is.

If someone is going to go through all the difficulty to install
protection, they might as well use the correct part. It isn't all that
difficult. The correct component would LIMIT surge to a safe value for the
tube and ALL other components until a breaker could open.

In the length of time it takes for the problem to degenerate to
transformer ESR, the expensive damage would already be done. Transformer
ESR has little to do with anything past the diodes except voltage
regulation.

73, Tom


From [e-mail] Thu Sep 12 16:46:47 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!holonet!colossus.holonet.net!woodybbs!9!1:2619/211!"joseph.m..zawodny".
From: "Joseph.M..Zawodny".%1:2619/211.9 ("Joseph M. Zawodny" %1:2619/211.9)
Date: 03 Sep 96 11:54:42
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: A not so obvious resistor question.
Message-ID: <[e-mail]>
Organization: WoodyWare Software, Inc.
Lines: 44

To: "Joseph M. Zawodny" %1:2619/211.9%12:320/100.666
From: "Joseph M. Zawodny" <[e-mail]>
Subject: Re: A not so obvious resistor question.
Organization: NASA Langley Research Center

Dave Kirkby wrote:
>
> I need a resistor of 10 Ohms in series with the anode supply to a tube takin
g
2A
> max. Hence the resistor needs to be 40 W. However, in the event of a tube
arc, I
> do not want the resistor to fuse, so it must take the full HT (5kV) for a
short time.
> This imples it must dissipate 500,000 W. Clearly, I'm not going to buy a 500
kW
> resistor, so I'm wondering what is the best choice to find a resistor(s) to
withstand
> this without going bang. I have 3 options:
>
> 1) Buy one big (say 300 W) resistor at 10 Ohms.
> 2) Put lots of lower powered resistors in parallel
> 3) Put lots of lower powered resistors in series.
>
> Any ideas on what is the best bet ?

Why won't a fuse work for this?  Surely someone must make a high voltage fuse
which could be utilized.


--
Work: Dr. Joseph M. Zawodny                     Play: Joe Zawodny
      NASA Langley Research Center                    [e-mail]
      E-mail: [e-mail]               [e-mail]
      [phone]  [phone] FAX

 # Origin: Usenet:NASA Langley Research Center (1:2619/211.9)

 # Origin: Gateway ARNet <-> HamNet by HB9EBW (12:320/100.666)
--
|Fidonet:  "Joseph M. Zawodny" %1:2619/211.9 2:301/249.666
|Internet: "Joseph.M..Zawodny".%1:2619/211.9
|
| Standard disclaimer: The views of this user are strictly his own.



From [e-mail] Thu Sep 12 16:46:51 1996
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From: Kenwood Customer Care <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: Case paint for Kenwood TS-940
Date: Mon, 09 Sep 1996 08:46:50 -0700
Organization: Kenwood Communication Corp.
Lines: 35
Message-ID: <[e-mail]>
References: <[e-mail]> <50k9ie$[e-mail]>
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Xref: news2.epix.net rec.radio.amateur.equipment:32226 rec.radio.amateur.homebrew:16671

D.W.Hemphill KC5NG wrote:
>
> This may sound silly, but, have you inquired with Kenwood?
> It would be great if they had touch-up paint available.
>
> 73 de KC5NG
> (also a big Kenwood fan!)
>
> In article <[e-mail]>, [e-mail] says...
> >
> >Has anyone found a suitable source for the case and
> >front panel paint on Kenwood HF gear?  I have a
> >relatively late S/N TS940 with scatches on the case
> >and the outer rim of the front panel and I'd love
> >to refinish them.  The case finish looks like it would
> >be tough to match as it's a textured (splattered?)
> >finish.  The front panel rim is just a plain semi-gloss.
> >Anybody tackle this sort of thing?  Could a local
> >auto-body shop duplicate these finishes?  All suggestions
> >welcomed.
> >
> >Dave, n2fam

Dear Dave,

Sorry, there have been no touch-up paint kits for the Kenwood radios.
The casings are powder coated when painted.  I will forward your comments
to our Product Planners.  There can be a slight difference in color even
with the new radios from batch to batch.

73
--
       |\___/|        http://www.kenwood.net
       | o o |   73 de Kenwood Customer Care
----oOO-------OOo---------------------------


From [e-mail] Thu Sep 12 16:46:52 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!metro.atlanta.com!news.radio.org!ka4ybr.netmha.com!not-for-mail
From: [e-mail] (Bob Duckworth)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: B&W Miniductor or Air Dux coils still made?  Any for sale?
Date: 5 Sep 1996 13:18:09 -0400
Organization: Mark Horton Associates
Lines: 14
Message-ID: <50n20h$[e-mail]>
References: <505dc4$[e-mail]> <50f7l0$[e-mail]> <50kmcm$[e-mail]>
NNTP-Posting-Host: ka4ybr.netmha.com

It's kinda silly when you can wind your own.
You can buy tin plated wire or tin it youself.
Use 'plexiglas' or even wood for the form.

Heck, I use soup cans for coil shields.
Paint em pretty colors too.

-bob

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


From [e-mail] Thu Sep 12 16:46:52 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!worldlinx.com!thunder.mgl.ca!server2.netrics.com!n2tor.istar!tor.istar!east.istar!news.nstn.ca!ott.istar!istar.net!van.istar!west.istar!n1van.istar!van-bc!unixg.ubc.ca!nntp.cs.ubc.ca!newsxfer.itd.umich.edu!news2.acs.oakland.edu!condor.ic.net!news.sojourn.com!cancer.vividnet.com!hunter.premier.net!www.nntp.primenet.com!nntp.primenet.com!cs.utexas.edu!howland.erols.net!nntp.crl.com!news.callamer.com!spork.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Low-noise RF power transistor?
Date: Fri, 6 Sep 1996 17:02:10 -0700
Organization: Call America Internet Services  [phone]
Lines: 5
Message-ID: <[e-mail]>
References: <50msh6$[e-mail]> <50n625$[e-mail]>
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To: Dana Myers <[e-mail]>
In-Reply-To: <50n625$[e-mail]>

Wow! I guess great minds are one.  I was just about ready to suggest the
2N5109 transistor as well.  It was described in just that fashion (first
IF following SBL-1 mixer) some years ago in QEX magazine.  It might take
some digging but it's there!!  73  Cliff Buttschardt K7RR ex W6HDO



From [e-mail] Thu Sep 12 16:46:53 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!nwlink.com!zommbee
From: [e-mail] (zommbee)
Newsgroups: rec.radio.swap,rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: WTB: Junk box stuff!!
Date: 5 Sep 1996 03:43:20 GMT
Organization: Northwest Link
Lines: 32
Message-ID: <50li8o$[e-mail]>
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Hi.

I am looking to buy 'junk box stuff' to help replenish my shop.  I have been
out of ham radio for 12 years, and in that time most of my RF related parts
have disappeared.  I used to tear apart old transmitters and receivers to get
coil forms, toroids, variable caps, and the like but most of those rigs are
now collectors items, even in non-working condition.

I much prefer to use 'old' used parts, rather than constantly dig out the
'DigiKey' catalog to buy new ones.

What I am looking for is coils, coil forms, variable caps, remnants of old
homebrew projects and long-dead rigs that have useable parts left, etc.
Tubes, (!), sockets, verniers, pots, etc.  (Transformers weigh too much to
ship!).  But mostly after coils and other RF components or portions of old
gear.

Not the 'new in the box variety', but the old scraggly but ueseable stuff
that makes junk boxes famous.  Maybe in $10, $20 or $50 'grab bag' assortment
boxes, or whatever works for you.  Don't go to any bother - just misc
parts and remnants in a box.  Don't bother to itemize - just a basic
description of what you have, and I'll trust you.  (I think hams still do
that!)

email what you have to:


Dave WB7AWK
[e-mail]



From [e-mail] Thu Sep 12 16:46:54 1996
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From: Jim <[e-mail]>
Newsgroups: rec.radio.swap,rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: Re: WTB: Junk box stuff!!
Date: 6 Sep 1996 14:30:35 GMT
Organization: IdeaSource
Lines: 9
Message-ID: <50pcib$[e-mail]>
References: <50li8o$[e-mail]>
NNTP-Posting-Host: 222.229.249.54
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Xref: news2.epix.net rec.radio.swap:72356 rec.radio.amateur.equipment:32170 rec.radio.amateur.homebrew:16653

Don't forget the obvious -- post on your local *.wanted and
*.forsale groups, asking for free electronics stuff, and promise
to haul it all off.

You can get some wonderful stuff this way.  Especially, offer to haul
off old TV sets, because they have a wealth of good stable coils and
parts in the various oscillators.




From [e-mail] Thu Sep 12 16:46:55 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.scott.net!acara.snsnet.net!news5.crl.com!nntp.crl.com!howland.erols.net!newsfeed.internetmci.com!news.uoregon.edu!arclight.uoregon.edu!netnews.worldnet.att.net!newsadm
From: [e-mail] (Ken White)
Newsgroups: rec.radio.amateur.homebrew
Subject: Copper Cactus
Date: Tue, 03 Sep 1996 00:56:26 GMT
Organization: AT&T WorldNet Services
Lines: 7
Message-ID: <50fvla$[e-mail]>
NNTP-Posting-Host: 40.tampa-1.fl.dial-access.att.net
X-Newsreader: Forte Free Agent 1.0.82

Need help finding plans for building the 2M antenna called the "Copper
Cactus". I built one some time ago using plans I'd downloaded from an
FTP site somewhere but can't for the life of me, remember where. It
used 1/2 inch copper pipe, was simple to build and works like a charm.
It may have come from a site in Buffalo.
Any thoughts? Thanks, KE4WIS



From [e-mail] Thu Sep 12 16:46:56 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!newsfeed.internetmci.com!news.stealth.net!news.idt.net!news
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Programmable Dividers + Freq. Std..
Date: 5 Sep 1996 01:00:58 GMT
Organization: IDT Corporation
Lines: 14
Message-ID: <50l8oa$[e-mail]>
NNTP-Posting-Host: hingham29.pcix.com
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

Gudday fellow HomeBrewers:
Can anyone point me in the right direction as to info on building a programmab
le divider
to take my 5 mhz xtal Osc which is controplled by Loran 'C'  and make countdow
n frequencies
so as to lock in Lowfer Transmitter (160-190khz) and the brick on my 10ghz ssb
/cw rig.
Can see +/- 50hz at 10ghz now so CCW on either band may be easier with locked
in
Sub Oscillators.
Any info, references appreciated

Am planning to put beacon back on 186 khz this winter.  Any takers??

73 de Dave Riley  AA1A   Marshfield, Massachusetts...  Where Prof. Fessenden d
id his magic
in 1905/6 from Brant Rock Station here in town.. Original Tower base survives
on N1EWA land..

Gudday....


From [e-mail] Thu Sep 12 16:46:59 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news1.channel1.com!wizard.pn.com!uunet!in3.uu.net!newsfeed.internetmci.com!malgudi.oar.net!hyperion.wright.edu!news.wright.edu!desire.wright.edu!nyoung
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: More tubes & more transformers & more snide social commentary
Date: 5 Sep 96 13:28:47 EST
Organization: Wright State University
Lines: 39
Message-ID: <[e-mail]>
NNTP-Posting-Host: desire.wright.edu

Well, where _would_ I get filament and plate
voltage transformers these here days? The filament
transformer is easy: Radio Shack. They have a couple
different 12.5 Volt center-tapped transformers that
would likely have enough hoos to light the filaments.
Maybe 5 A would do, seems to me.

Plate transformers are another matter, since it's
dagnab hard to find that sort of stuff now. WHich means
that I would have to do the flea market/surplus radio
search. Here in the Dayton, OH area we have the always
popular Mendelson's Surplus. Spend a couple days in there
looking for stuff what ain't where the sign says it would
be. ANd Midwest Surplus in Fairborn might have the stuff,
since they have a big pile of transformers... and you
can see what they are and don't have to wander around
to find 'em.

The rest of the stuff I'd drag out of old radios
what don't work no more. Easy part, that. Besides,
I've been blowing stuff up pretty much non-stop since
I was 12, so I have a big box of blown up stuff that
has trashformers and suchlike stuff in it. Even tubes.

I still like not havin' to take off my glasses and
get out the microfilament interlaminar exoskeleton
cosmic dry-ice evaporated vacuum gold-plated zee-tron
microscope to look at the resistor codes. Ah, the joys
of being old enough to know what to do with all this
old stuff that young whipper-snapper engineering
dreamer types can't even figure which end goes in the
socket.

That and tapioca.

73
Nils
WB8IJN &c



From [e-mail] Thu Sep 12 16:47:02 1996
Path: news2.epix.net!news3.epix.net!uunet!in2.uu.net!cam-news-hub1.bbnplanet.com!howland.erols.net!newsxfer2.itd.umich.edu!netnews.worldnet.att.net!newsadm
From: Woody White <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: More tubes & more transformers & more snide social commentary
Date: Sat, 07 Sep 1996 03:39:18 -0700
Organization: I am disorganized...
Lines: 42
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: 227.st-louis-004.mo.dial-access.att.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.01E (Win16; I)

[e-mail] wrote:
>
> Well, where _would_ I get filament and plate
> voltage transformers these here days? The filament
> transformer is easy: Radio Shack. They have a couple
> different 12.5 Volt center-tapped transformers that
> would likely have enough hoos to light the filaments.
> Maybe 5 A would do, seems to me.

I hope they have changed but, if not, beware of RS transformers.
 The ones I tried several years ago were junk.  Losses were so
bad that they would run hot even under near no load condx.
   ---   Keep that proffit high, RS!   ---

> Plate transformers are another matter, since it's
> dagnab hard to find that sort of stuff now. WHich means
> that I would have to do the flea market/surplus radio
> search.

That's fer sure...

...snip...

> I still like not havin' to take off my glasses and
> get out the microfilament interlaminar exoskeleton
> cosmic dry-ice evaporated vacuum gold-plated zee-tron
> microscope to look at the resistor codes. ...snip...
Know what u mean... I do some UHF chip stuff.... Have several
diopter ranges of reading glasses useful for homebrewing.
Power supplies: 1.25 - HF 'brewing: 1.5 - VHF: 1.75 - UHF^: 2.25+
 :-)    Woody

> 73
> Nils
> WB8IJN &c

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


From [e-mail] Thu Sep 12 16:47:03 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!tank.news.pipex.net!pipex!news.be.innet.net!INbe.net!news.nl.innet.net!INnl.net!hunter.premier.net!www.nntp.primenet.com!nntp.primenet.com!news.sgi.com!enews.sgi.com!decwrl!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news
From: Michael Tracy <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Who sells kits?
Date: Fri, 06 Sep 1996 14:41:27 -0700
Organization: American Radio Relay League, Inc.
Lines: 23
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: mtracy.arrl.org
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0 (Win16; I)

Mark,
        For ARRL's recently updated list of kit manufacturers, point
your web browser to:

ftp://oak.oakland.edu/pub/hamradio/arrl/infoserv/tech/kits.txt

For a list of all ARRL files at this site, see:

ftp://oak.oakland.edu/pub/hamradio/arrl/index.txt

Also be sure to check out Brian Carling's kits and parts list at:

http://www.mnsinc.com/bry/mega/megalist.txt

Although Brian doesn't always have the latest addresses, he does have
more suppliers on file than we do.

Best Regards, Michael Tracy, KC1SX, ARRL Technical Information Services
-----------------------------------------------------------------------
American Radio Relay League, Inc.     Tel: [phone]
225 Main Street                       Fax: [phone]
Newington, CT 06111                   Email: [e-mail] (internet)
-----------------------------------------------------------------------


From [e-mail] Thu Sep 12 16:47:04 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.scott.net!acara.snsnet.net!news5.crl.com!nntp.crl.com!newshub.cts.com!usc!howland.erols.net!newsfeed.internetmci.com!nntp.earthlink.net!usenet
From: asiv ([e-mail])
Newsgroups: alt.guitar,alt.bass,alt.guitar.amps,alt.guitar.bass,alt.ham.radio.amtor,rec.musicmakers.guitar,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.shortwave
Subject: FS: Tube Tester
Date: Thu, 05 Sep 1996 21:08:19 GMT
Organization: Earthlink Network, Inc.
Lines: 12
Message-ID: <[e-mail]>
NNTP-Posting-Host: pool024.max8.atlanta.ga.dynip.alter.net
Xref: news2.epix.net alt.guitar:104484 alt.bass:1471 alt.guitar.amps:13860 alt.guitar.bass:22860 rec.radio.amateur.equipment:32183 rec.radio.amateur.homebrew:16658 rec.radio.shortwave:78338


Tube tester, Electron Tube model TV2C/U, in near dead mint condition, everythi
ng
intact (including wheel). If you are near Nashville, I can deliver it, or
otherwise you pay shipping, etc.

They don't even come close to making them like this anymore...

Best serious offer....please respond before 9/7

[e-mail]




From [e-mail] Thu Sep 12 16:47:05 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsfeed1.aimnet.com!www.nntp.primenet.com!nntp.primenet.com!news.sgi.com!news.msfc.nasa.gov!newsfeed.internetmci.com!in3.uu.net!mcsun!EU.net!sun4nl!rnzll3!sys3.pe1chl!rob
From: [e-mail] (Rob Janssen)
Subject: Re: Source for 0.05 Ohm Resistors?
X-Newsreader: NN version 6.5.0 (NOV)
Reply-To: [e-mail]
Organization: PE1CHL
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
Date: Thu, 5 Sep 1996 09:40:12 GMT
Lines: 27

In <[e-mail]> Steve Wolf <[e-mail]> writes:

>Thomas G. McWilliams wrote:
>>
>> Steve Wolf ([e-mail]) wrote:
>> : Trying rec.radio.amateur.homebrew as the post to equipment resulted in
>> : nothing but blank stares.
>>
>> Why don't you build your own? Check out the copper wire table in the
>> ARRL manual. Choose a suitable gauge of wire and cut the appropriate
>> length. If inductance is not a problem you could wind it on a coil
>> form. Or how about paralleling some 0.1 ohm or 0.5 ohm resistors, both
>> common values. I've successfully made amp meter shunts using the
>> wire table as a guide.
>>
>> [e-mail]

>The wire wouldn't stand the current.

Hey, it said "Choose a suitable gauge of wire"!  When it doesn't stand
the current it wasn't a suitable gauge of wire.

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


From [e-mail] Thu Sep 12 16:47:06 1996
Path: news2.epix.net!news3.epix.net!uunet!in1.uu.net!cam-news-hub1.bbnplanet.com!howland.erols.net!agate!newsgate.duke.edu!news.eff.org!news.apk.net!news
From: Steve Wolf <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Source for 0.05 Ohm Resistors?
Date: Fri, 06 Sep 1996 06:48:43 -0400
Organization: The Wolf Family
Lines: 25
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
NNTP-Posting-Host: pm2-22.apk.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.0 (Win95; I)
To: [e-mail]

> >> Why don't you build your own? Check out the copper wire table in the
> >> ARRL manual. Choose a suitable gauge of wire and cut the appropriate

> >The wire wouldn't stand the current.
> Hey, it said "Choose a suitable gauge of wire"!  When it doesn't stand
> the current it wasn't a suitable gauge of wire.

Where do you put a roll of #10 in a power supply box, hi hi.

It's obvious that the resistor serves a purpose that is very difficult to
fill with a roll of magnet wire.  A number of responses have indicated
that they sometimes fail and act as a fuse.  The physical layout of the
power supply is not cramped.  However, there isn't room for whatever
gauge wire would be required.  Not replacing the resistor with a resistor
would be poor engineering.

As the resistor is $1.00 from Astron and $1.76 from Newark, I went ahead
and ordered a handful from Astron.

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


From [e-mail] Thu Sep 12 16:47:07 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-atl-21.sprintlink.net!news.sprintlink.net!news-fw-6.sprintlink.net!tezcat!cam-news-hub1.bbnplanet.com!howland.erols.net!newsfeed.internetmci.com!news.ais.net!usenet
From: [e-mail]
Newsgroups: rec.collecting,alt.disney.secrets,rec.equestrian,rec.pets.dogs.behavior,rec.video.releases,alt.rec.camping,rec.radio.amateur.homebrew,re.radio.amateur.misc,rec.arts.animation,a.disney.disneyland
Subject: Re: Fast, FAST MONEY!!!!!!!
Date: 7 Sep 1996 16:11:34 GMT
Organization: American Information Systems, Inc.
Lines: 40
Message-ID: <50s6rm$[e-mail]>
References: <50qhjm$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ts01-24.dialup.ais.net
X-Newsreader: IBM NewsReader/2 v1.2.5
Xref: news2.epix.net rec.collecting:87873 alt.disney.secrets:1977 rec.equestrian:139022 rec.pets.dogs.behavior:29462 rec.video.releases:22213 alt.rec.camping:48 rec.radio.amateur.homebrew:16660 rec.arts.animation:52665

The only way to effectively stop this chain-letter crap is to alert the
ISP from which it originates ... as follows:

(mail/foward the SPAM to "abuse@<abuser's_ISP_domain>" and
"Postmaster@<abuser's_ISP_domain>) with a note like this:

Dear Netcom (chage ISP name as appropriate) System Administrator:

Please deal with this jerk who is SPAMing the net from one of your
sites. (assuming the address is not forged)

I forwarded a similar SPAM to "abuse" and "postmaster" at
PSInet/Interramp, and got a prompt response that the user's account had
been terminated.

I hope I will get the same sort of reaction from your organization.
This stuff has got to stop and the only way is for ISPs to act
responsibly by not allowing their users to spew this stuff to the
newsgroups and/or as unsolicited e-mail to hundreds(thousands) of
unwilling recipients.

Thanks in advance for your attention to this matter,
Carl Stevenson
[e-mail]




[e-mail](michael dudley) writes:
>>

In <50qhjm$[e-mail]>, [e-mail](michael dudley) wr
ites:
>>
(a whole bunch of SPAM soliciting participation in a chain letter
scheme, and encouraging readers to "post it to at least 200 newsgroups)

(be sure to include the SPAMer's entire serving of SPAM, so the ISP can
enjoy it to its fullest ... and appreciate that it really is abuse of
the net)



From [e-mail] Thu Sep 12 16:47:08 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-atl-21.sprintlink.net!psgrain!usenet.eel.ufl.edu!news-peer.gsl.net!news.gsl.net!www.nntp.primenet.com!nntp.primenet.com!cpk-news-hub1.bbnplanet.com!newsfeed.internetmci.com!news.bctel.net!noc.van.hookup.net!eloi.vir.com!rcogate.rco.qc.ca!news.total.net!user
From: [e-mail] (Mike Walker)
Newsgroups: rec.collecting,alt.disney.secrets,rec.equestrian,rec.pets.dogs.behavior,rec.video.releases,alt.rec.camping,rec.radio.amateur.homebrew,re.radio.amateur.misc,rec.arts.animation,a.disney.disneyland
Subject: Re: Fast, FAST MONEY!!!!!!!
Date: Tue, 10 Sep 1996 00:35:59 -0500
Organization: Scholarly Computing Project
Lines: 30
Message-ID: <[e-mail]>
References: <50qhjm$[e-mail]> <50s6rm$[e-mail]>
NNTP-Posting-Host: 199.166.232.61
Xref: news2.epix.net rec.collecting:88038 alt.disney.secrets:1984 rec.equestrian:139143 rec.pets.dogs.behavior:29555 rec.video.releases:22222 alt.rec.camping:64 rec.radio.amateur.homebrew:16675 rec.arts.animation:52702

In article <50s6rm$[e-mail]>,
[e-mail] wrote:

>The only way to effectively stop this chain-letter crap is to alert the
>ISP from which it originates ... as follows:
>
>(mail/foward the SPAM to "abuse@<abuser's_ISP_domain>" and
>"Postmaster@<abuser's_ISP_domain>) with a note like this:

Well, there is also another approach! Discussion here indicates that
electronic repsonses to their providers will likely not work, since many
post from anon accounts or otherwise disgusise or avoid retribtion for
their garbage. But they do POST THEIR REAL SNAIL MAIL ADDRESSES in order to
get the thousands, perhaps millions (yeah, right!) of $$$ fools are going
to send them.

Now, I'm not saying I plan to do this myself, but what would happen if
someone downloaded and printed out some of the that child porn I am told is
lurking all over  the internet, then put it in a CLEARLY MARKED  envelope
("Attn: Kiddie Porn") and sent it to each of the 5 names on the list?
Perhaps with a nice note ("Here are the child sex photos you requested.
Thank you for the really juicy ones you sent me, if you have any others
featuring (you supply the smut), you know how to get hold of me. - Rocko").
Do you think that would likely get someone's attention (esp. since several
of these are in other coutries)? I bet the number of people posting this
spam would drop very quickly!






From [e-mail] Thu Sep 12 16:47:10 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.mindspring.com!www.nntp.primenet.com!nntp.primenet.com!news-peer.gsl.net!news.gsl.net!ix.netcom.com!news
From: KD1YV <[e-mail]>
Newsgroups: rec.radio.amateur.space,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc
Subject: W. CT Hamfest close to NY state line, 15-Sep
Date: Sat, 07 Sep 1996 15:57:03 -0300
Organization: Hamily !
Lines: 25
Message-ID: <[e-mail]>
NNTP-Posting-Host: tfx-us7-14.ix.netcom.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-NETCOM-Date: Sat Sep 07 12:58:41 PM PDT 1996
X-Mailer: Mozilla 2.02 (Win16; I)
Xref: news2.epix.net rec.radio.amateur.space:7460 rec.radio.amateur.misc:106506 rec.radio.amateur.homebrew:16661 rec.radio.amateur.digital.misc:16906

THE WESTERN CONNECTICUT HAMFEST
Sponsored by the Candlewood Amateur Radio Association

Just 14 miles from the NY/CT State line!

Sunday, Sept. 15, 1996                      0900-1400
Edmond Town Hall                 Route 6, Newtown, CT
Tables inside                      Tailgating outside
ARRL Sanctioned                    Handicapped Access
Door Prizes                             Ample Parking
Gourmet Fare                            Rain or shine

Talk-in 147.12/.72 PL 141.3

General admission $4.00 at the door (what a deal!)

Tailgating $6.00, inside table reservations $10.00 each, (both
include 1 admission), mail to:
Candlewood Amateur Radio Association, PO BOX 3441, Danbury CT 06813

For more info, phone [phone] or [phone].

Hope to see you all there.
73 de KD1YV
Jim


From [e-mail] Thu Sep 12 16:47:10 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!southwind.net!symbios.com!csn!nntp-xfer-2.csn.net!csn!nntp-xfer-1.csn.net!ncar!elroy.jpl.nasa.gov!news.msfc.nasa.gov!newsfeed.internetmci.com!www.nntp.primenet.com!nntp.primenet.com!cam-news-hub1.bbnplanet.com!howland.erols.net!math.ohio-state.edu!jussieu.fr!oleane!in2p3.fr!swidir.switch.ch!swsbe6.switch.ch!surfnet.nl!halley.pi.net!news
From: adriaan <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: new url in apeldoorn
Date: Sat, 07 Sep 1996 01:45:43 -0700
Organization: Planet Internet
Lines: 14
Message-ID: <[e-mail]>
NNTP-Posting-Host: 145.220.205.27
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.01E-PI-16  (Win16; I)

Hello,

The url has change, see for it..

Greetings Adriaan

------------------------------------------------
Adriaan PE1KHP                      Radioamateur
Homepage              radioamateurs in Apeldoorn
http://www.pi.net/~adpe1khp/home.htm
------------------------------------------------
Packet radio is tijdens de maand september NIET
in gebruik door een verhuizing van de shack
------------------------------------------------


From [e-mail] Thu Sep 12 16:47:11 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!howland.erols.net!www.nntp.primenet.com!nntp.primenet.com!cs.utexas.edu!chi-news.cic.net!news.bright.net!news
From: norman <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: NEW POWER SUPPLYS
Date: 7 Sep 1996 19:11:25 GMT
Organization: your orginanization
Lines: 4
Message-ID: <50shct$[e-mail]>
NNTP-Posting-Host: craw-cs-6.dial.bright.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 1.1 (Windows; I; 16bit)

I have some new POWER-ONE adjustable supplies. 13.5 to 17 VDC @1.5 amps.
Has over voltage protection. open frame type. Will sell for $15 ea. or
2 for $30.  Contact Norm  N8RGR  [e-mail]



From [e-mail] Thu Sep 12 16:47:12 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!nntp.coast.net!news2.acs.oakland.edu!condor.ic.net!news.cic.net!chi-news.cic.net!ddsw1!news.mcs.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!newsfeed.internetmci.com!in3.uu.net!spool.news.idt.net!news
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Frequency Standards
Date: 8 Sep 1996 14:44:53 GMT
Organization: IDT Internet
Lines: 21
Message-ID: <50um55$[e-mail]>
NNTP-Posting-Host: hingham160.pcix.com
X-Newsreader: SPRY News 3.03 (SPRY, Inc.)

Gudday fellow Home Brewers..

My best shot so far for accurate frequency calibration is as follows:

A 5mhz James Knight Proportional Oven Oscillator divided down to 100khz and th
en
compared on the scope with Nantucket Loran 'C' via a TRF receiver does better
than
.001 PPM with just manual control. This will be much more than needed for LOWF
ER
transmitter frequency calibration. It also lets me tweek the 10ghz brick to wi
thin a couple
hundred cycles at 10ghz..
I found that by varying the DC on the tuning cap inside the oven and isolating
 by a 68k
resistor then varied from 0 to 28 VDC swings the 5mhz sig by 4 hertz.. This is
 via a 10
turn precision pot.    I never need to turn the pot. more than a quarter turn
now to be well
within .001ppm..

What are you using??

The TRF receiver is a converted Navy RAK with J-Fets at each tube base.. works
 fine..

73's de Dave Riley  AA1A   Marshfield, Mass.




From [e-mail] Thu Sep 12 16:47:13 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!howland.erols.net!vixen.cso.uiuc.edu!uwm.edu!news-peer.gsl.net!news.gsl.net!portc01.blue.aol.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (JohnsonHE)
Newsgroups: rec.radio.amateur.homebrew
Subject: Siliconix/MACom VMP-4 mosfets
Date: 8 Sep 1996 11:06:29 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 8
Sender: [e-mail]
Message-ID: <50undl$[e-mail]>
Reply-To: [e-mail] (JohnsonHE)
NNTP-Posting-Host: newsbf02.mail.aol.com

Several years ago, both Siliconix and PHI, a division of MACom made a
device numbered the VMP-4, a power VMOS fet. Anyone that has any of these
devices that they'd rather have cash for, please let me know via the
address below.

[e-mail]

W4ZCB


From [e-mail] Thu Sep 12 16:47:14 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-atl-21.sprintlink.net!news.sprintlink.net!news-fw-6.sprintlink.net!news.cdsnet.net!news.magicnet.net!news.iag.net!enews.sgi.com!www.nntp.primenet.com!nntp.primenet.com!uunet!in2.uu.net!nwnews.wa.com!nwfocus.wa.com!rook.wa.com!eugene.welcome
From: [e-mail] (Eugene Welcome)
Newsgroups: rec.radio.amateur.homebrew
Subject: VT-25A Tubes
Date: Mon, 09 Sep 1996 05:15:08 GMT
Message-ID: <[e-mail]>
Distribution: world
Lines: 17

GS> The VT-25A tube is listed as a "10Y" or "10 Special" in the
GS> literature. Does anyone know "Y" it is "Special"?  Is it just a
GS> ruggedized 10?

Hi Gordon, the 10 and 10Y differences is in the plate to filament
capacitance. 10 = 4 Pfd and 10Y = 3 Pfd. The 10 = 6 mHz had a lower
maximum frequency to the 10Y which = 8 mHz. If you find a Raytheon
RK10, it had a guaranteed frequency of 60 mHz which at that time was in
the UHF band. The 10, 10Y and RK10 all are equal in power requirements
and output specs are identical. The 10 tube was also used in receivers
and had specs for that use and can be located in the early ARRL
Handbooks.
                       _   /|
                       \'o 0'
73, Gene, K7"EEK" !! a =(_"_)= ?? He ate my Mouse !
                          U
[e-mail]


From [e-mail] Thu Sep 12 16:47:15 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!howland.erols.net!www.nntp.primenet.com!nntp.primenet.com!arclight.uoregon.edu!netnews.worldnet.att.net!ix.netcom.com!news
From: KD1YV <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.space,rec.radio.amateur.antenna
Subject: W. CT Hamfest This Sunday, Newtown, CT 15-Sep
Date: Mon, 09 Sep 1996 22:52:34 -0300
Organization: Hamily !
Lines: 25
Message-ID: <[e-mail]>
NNTP-Posting-Host: tfx-us6-16.ix.netcom.com
Mime-Version: 1.0
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Xref: news2.epix.net rec.radio.amateur.homebrew:16673 rec.radio.amateur.space:7469 rec.radio.amateur.antenna:24089

THE WESTERN CONNECTICUT HAMFEST
Sponsored by the Candlewood Amateur Radio Association

Just 14 miles from the NY/CT State line!

Sunday, Sept. 15, 1996                      0900-1400
Edmond Town Hall                 Route 6, Newtown, CT
Tables inside                      Tailgating outside
ARRL Sanctioned                    Handicapped Access
Door Prizes                             Ample Parking
Gourmet Fare                            Rain or shine

Talk-in 147.12/.72 PL 141.3

General admission $4.00 at the door (what a deal!)

Tailgating $6.00, inside table reservations $10.00 each, (both
include 1 admission), mail to:
Candlewood Amateur Radio Association, PO BOX 3441, Danbury CT 06813

For more info, phone [phone] or [phone].

Hope to see you all there.
73 de KD1YV
Jim


From [e-mail] Thu Sep 12 16:47:16 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.cdsnet.net!news.magicnet.net!news.iag.net!enews.sgi.com!www.nntp.primenet.com!nntp.primenet.com!cpk-news-hub1.bbnplanet.com!newsfeed.internetmci.com!info.ucla.edu!unixg.ubc.ca!van-bc!n1van.istar!van.istar!west.istar!ott.istar!istar.net!tor.istar!east.istar!newsjunkie.ans.net!newsfeeds.ans.net!lehi.kuentos.guam.net!news
From: [e-mail] (Jim Kehler)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: Key Input Specs?
Date: Tue, 10 Sep 1996 08:19:07 GMT
Organization: PacRim Golf Accessories
Lines: 16
Message-ID: <513c0j$[e-mail]>
References: <01bb9e8e$8ea8ea80$[e-mail]>
Reply-To: [e-mail]
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Xref: news2.epix.net rec.radio.amateur.homebrew:16674 rec.radio.amateur.misc:106539

"Rick Miller" <[e-mail]> wrote:

>Hi!

>Can someone tell me what open-circuit voltage and closed-circuit current
>the device attatched to the "key" input of a rig is supposed to be able to
>handle?  If 5 Volts and 25 mA is sufficient, I'll be a happy camper!

>Otherwise, I'll have to use a FET I guess.

>Rick Miller (kb9obn) [e-mail]

Give us a clue, Rick. Which 'rig' ?





From [e-mail] Thu Sep 12 16:47:16 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!panix!news1.erols.com!howland.erols.net!www.nntp.primenet.com!nntp.primenet.com!uunet!in2.uu.net!news.shentel.net!usenet
From: "Dacha" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Ku-band transceivers for sale for parts.
Date: 10 Sep 1996 03:05:01 GMT
Organization: Visor and Associates Inc.
Lines: 3
Message-ID: <01bb9ec3$cc636d20$8c016fcc@dacha>
NNTP-Posting-Host: eb3ppp12.shentel.net
X-Newsreader: Microsoft Internet News 4.70.1155

New or like new Ku-band transceiver RF heads for sale $50.00 each. Cheaper
by the dozen.
PLL sub-system. Great for parts or use as is. No data.


From [e-mail] Thu Sep 12 16:47:18 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!panix!news1.erols.com!howland.erols.net!surfnet.nl!sun4nl!nuclint!sns3.nuclint.nl!usenet
From: Frans van Eck <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Schematict amp
Date: Tue, 10 Sep 1996 11:10:41 +0200
Organization: Nucletron
Lines: 22
Message-ID: <[e-mail]>
NNTP-Posting-Host: prod1.nuclint.nl
Mime-Version: 1.0
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Where can i find schematics for an amp with a 4cx1000 connected as a
tetrode? It is for a frequenty range from 1.8mc to 30-50mc.
--

Frans


/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
|              Frans van Eck  NL 9352     Phone    : [phone]
|
| ===/ ====    Nucletron Engineering      Fax      : [phone]
|
| ==< ====     P.O. Box 930               Telex    : 37056 nucle nl
|
|    \ ====    3900 AX Veenendaal         Internet : [e-mail]
|
|              The Netherlands    \\V//   at home  : [e-mail]
|
|                                 (o o)
|
|------------------------------oo0-(_)-0oo--------------------------------
                                    ~


From [e-mail] Thu Sep 12 16:47:18 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!demos!news.stealth.net!www.nntp.primenet.com!nntp.primenet.com!news-peer.gsl.net!news.gsl.net!portc01.blue.aol.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: A not so obvious ham-homebrew posting qu
Date: 10 Sep 1996 14:44:55 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 22
Sender: [e-mail]
Message-ID: <514cv7$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

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

>
>On Sept. 9th,  Ham-Homebrew Digest V96 #389....
>re-posting an old response 5 days later?
>
>Tony K
>VA3TK

Because a end system reflected it back on internet. Sometimes that happens
when a system is "full" and/ or the software is flawed. I'm not sure if
that was the case here or not.

The same thing happened with that very same system a month ago, it stated
bouncing everything back. Either the operator is a Lid or the software is
incorrect.

73 Tom





From [e-mail] Thu Sep 12 16:47:19 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!panix!news1.erols.com!howland.erols.net!newsfeed.internetmci.com!in3.uu.net!news.new-york.net!actcom!news
From: [e-mail] (innovative technologies)
Subject: low power 300MHz transmitter
X-Nntp-Posting-Host: p23.haifa2.actcom.co.il
Message-ID: <[e-mail]>
Sender: [e-mail] (News)
Reply-To: [e-mail]
Organization: innovative technologies
X-Newsreader: Forte Free Agent 1.0.82
Date: Tue, 10 Sep 1996 15:04:40 GMT
Lines: 15

Hello,

For a security application, we're looking for a simple swept frequency
(i.e. varactor tuned) oscilator/transmitter design for the 300-400MHz
range. Power output should be about 500mW. Coupling to an antenna
(such as a simple rod ) is also necessary. Frequency stability isn't
mandatory and a simple design (even single power transistor) is
preffered. Fixed frequency (manual tuning) designs are also welcome.
Can anybody point us to a simple design (and save us some of the
hassle when designing from scratch...:-)

thanks and best regards,
                                Inno




From [e-mail] Thu Sep 12 16:47:22 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.clark.net!mr.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!newsfeed.internetmci.com!in2.uu.net!news.accessone.com!news
From: [e-mail] (Ed Mitchell)
Newsgroups: rec.radio.amateur.digital,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.dx,rec.radio.amateur.policy,rec.ham-radio.swap,rec.ham-radio.packet
Subject: Re: Ham Radio as an *ENJOYABLE*  Hobby
Date: 11 Sep 1996 02:56:55 GMT
Organization: Virtual Publishing Co.
Lines: 27
Distribution: world
Message-ID: <5159pn$[e-mail]>
References: <[e-mail]> <[e-mail]>
NNTP-Posting-Host: vbook.accessone.com
X-Newsreader: WinVN 0.99.5
Xref: news2.epix.net rec.radio.amateur.misc:106574 rec.radio.amateur.homebrew:16680 rec.radio.amateur.equipment:32255 rec.radio.amateur.dx:286 rec.radio.amateur.policy:36384

In article <[e-mail]>, [e-mail] says...
>
>[e-mail] wrote:
>>
>> The primary goal of the group will be to fill an existing void by
>> providing an enjoyable forum for the discussion of technical, operating
>> and social topics of interest to radio amateurs.
>
>What a novel idea!  :^)  Here's hoping it catches on.
>--
>Dick Flanagan, W6OLD - ([e-mail]) - Minden, Nevada

You know, this is why we created Ham Radio Online. Ham Radio is actually a hec
k
of a lot of fun!!!! And we are trying our best to report on the fun that most
hams (who have not discovered the Internet :) ) are having on the air, buildin
g
antennas, tinkering with equipment, or slogging through a forest on a voluntee
r
search/rescue mission.

Stop on by and enjoy our web site, http://www.hamradio-online.com - now read i
n
43 countries around the globe.

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



From [e-mail] Thu Sep 12 16:47:23 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.insinc.net!scanner.worldgate.com!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!cs.utexas.edu!news.ti.com!news.dseg.ti.com!news
From: [e-mail] (D.W.Hemphill KC5NG)
Newsgroups: rec.radio.amateur.homebrew
Subject: FS: Filter Capacitors for Heath power supplies
Date: 10 Sep 1996 17:48:57 GMT
Lines: 15
Message-ID: <5149m9$[e-mail]>
NNTP-Posting-Host: cna0952843.dseg.ti.com
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.7

Are you rebuilding a Heath HP-23 series power supply?  You are?  Well,
great... I have the capacitors you need to complete the job:

Sprague 150 uf, 500 WVDC, twist-lock cans, brand new fresh stock (not
dried-out leftovers from some old TV shop!).  Set of four is $40 plus
$3.00 for postage.  Nearest caps on the market these days cost $20 to
$25 each!  Sold in sets of four only!  I have TWO sets available, and
I may not be able to get any more I know I said this once before, but
my supplier managed to locate a few more).

Contact me via email:  [e-mail]

Thanks and 73!   Dean Hemphill, KC5NG




From [e-mail] Thu Sep 12 16:47:24 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!cs.utexas.edu!newshost.convex.com!cnn.exu.ericsson.se!erinews.ericsson.se!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: 2M linear PA problem
Date: 11 Sep 1996 13:39:20 GMT
Organization: Ericsson
Lines: 14
Message-ID: <516fe8$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: kicc16.eraj.ericsson.se

Got a 'ex.linear' transistor final amp. for 144MHz.
On SSB the PA sounds very bad, according to
the guys on the band.
It is a 12VDC two-transistor PA with a gasfet preamp.
MIRAGE rated 160W output, but i'd rather say 125W
at the moment.

I want to get the PA into shape again, and need
some hints on what-to-check, bias, current balance
on the transistors etc..

Chris SM0NCL, now QRP on 2M




From [e-mail] Thu Sep 12 16:47:25 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!newsfeed.internetmci.com!news.sgi.com!enews.sgi.com!decwrl!pa.dec.com!depot.mro.dec.com!mrnews.mro.dec.com!asic.enet.dec.com!randolph
From: [e-mail] (Tom Randolph)
Newsgroups: rec.radio.amateur.homebrew
Subject: BSX59 ?
Date: 11 SEP 96 12:06:39
Organization: Digital Equipment Corporation
Lines: 11
Message-ID: <516oej$[e-mail]>
NNTP-Posting-Host: bootnd.enet.dec.com


Anything that anyone can tell me about the BSX59 transistor would be greatly
appreciated. It's apparently an RF power transistor. I'm looking for stuff lik
e
Ft, dissipation, Ic, max voltages, etc...

We inherited several hundred of these from a video lab downstairs from us that
closed up a couple of weeks ago.

==============================================================================
Tom Randolph  N1OOQ  NE-QRP 419  QRP-L 87  ARRL     [e-mail]
==============================================================================


From [e-mail] Thu Sep 12 16:47:26 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!cs.utexas.edu!howland.erols.net!newsfeed.internetmci.com!info.ucla.edu!news.ucdavis.edu!indigo!mays
From: mays@indigo (Skip May)
Newsgroups: rec.radio.amateur.homebrew
Subject: FS: NIB Eimac 304TL tube very cheap.
Date: 11 Sep 1996 17:29:33 GMT
Organization: University of California, Davis
Lines: 7
Message-ID: <516stt$[e-mail]>
NNTP-Posting-Host: indigo.ucdavis.edu
X-Newsreader: TIN [version 1.2 PL2]

Hello there,
I've found a new Eimac 304TL on the shelf in the original box. Nice,
clean and new, for sale real cheap. Just email me with any real offer and
it could be yours.
Thanks
Skip May  wv6f
[e-mail]


From [e-mail] Thu Sep 12 16:47:27 1996
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!www.nntp.primenet.com!nntp.primenet.com!netcom.com!wa2ise
From: [e-mail] (Robert Casey)
Subject: Vacuum Tube windows TTF font posted in  alt.binaries.fonts
Message-ID: <[e-mail]>
Organization: Netcom Online Communications Services (408-241-9760 login: guest)
Date: Thu, 5 Sep 1996 07:14:44 GMT
Lines: 7
Sender: [e-mail]
Xref: news2.epix.net rec.radio.amateur.homebrew:16685 rec.radio.amateur.misc:106585

I made up a public domain Windows truetype font, each letter or number
inside a vacuum tube.  Tubes are the "shoulder" style.

Find it posted in   alt.binaries.fonts

enjoy
73s


From [e-mail] Thu Sep 12 16:47:27 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!newsfeed.internetmci.com!news.campus.mci.net!not-for-mail
From: Harry Clinton <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Homebrew for lightning protection
Date: Fri, 06 Sep 1996 10:16:23 -0500
Organization: CampusMCI
Lines: 3
Message-ID: <[e-mail]>
NNTP-Posting-Host: s25-pm01.hcc-uky.campus.mci.net
Mime-Version: 1.0
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X-Mailer: Mozilla 2.01 (Win95; U)

Lightning protection informatiom sent to United States postal address
only.  Email address you wish info sent.  Plans for static charge
dissipation.


From [e-mail] Thu Sep 12 16:47:28 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!hunter.premier.net!www.nntp.primenet.com!nntp.primenet.com!news.sgi.com!csulb.edu!news.uoregon.edu!waikato!comp.vuw.ac.nz!canterbury.ac.nz!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Simeple receiver plans
Date: 4 Sep 1996 23:13:59 GMT
Organization: Psychology, University of Canterbury
Lines: 26
Message-ID: <50l2fn$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: 132.181.218.20
Mime-Version: 1.0
X-Newsreader: WinVN 0.99.2

In article
<[e-mail]>,
[e-mail] says...
>
>Hello everyone.  I'm looking for SIMPLE
receiver plans.  Ideally I would
>like it to be able to be made from Radio
Shack parts, be cheap to make,
>receive somewhere in the HF bands and to be
able to be sensitive enough
>to receive SSB and CW.  Thanks...
>                                Andy
>                                KB0MMU
Andy,

Try Direct coversion receiver, if you need a
new design approach to this very intriging
receiver there are recommendations in
current issue of Break-IN, of NZART.
You may fishout the articles relavant by
using library systems,and applied science
CD-ROMs. Best luck, call if you need our
paper.
73, Winton. P.S any sign of Andy KB0JSU.




From [e-mail] Thu Sep 12 16:47:31 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!news-in.tiac.net!sunfish.hi.com!brainiac.hi.com!user
From: [e-mail] (Steve Byan)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Simple (Inexpensive) Radio Kits?
Date: Fri, 06 Sep 1996 15:17:31 -0400
Organization: Hitachi Computer Products, Inc.
Lines: 34
Message-ID: <[e-mail]>
References: <50ndol$[e-mail]>
NNTP-Posting-Host: brainiac.hi.com

In article <50ndol$[e-mail]>, [e-mail] (N2TKX) wrote:

> Does anyone know of a source for very inexpensive radio kits - like less
> than $5.00?

No, but you should be able to homebrew a crystal set for about that - $.30
for the 1N34A detector, several bucks for the crystal earphone, $.60 for
the 10K resistor and 0.01 uF cap to parallel with the earphone, and $.50
for a fixed 350 pf cap. I'll assume you scavange some fine enameled wire
from a TV flyback transformer or some such. Wind a 250 uH coil on a 2"
paper mailing tube form and  coat it with shellac to keep things together.
Take some sheet brass or phosphor-bronze and make a sliding contact for
the coil. Sandpaper off the insulation in a 1/4 inch wide strip where the
slider makes contact along the coil. Arrange for the sliding contact to
short the end of the coil, and you have a variable inductor that you will
use to tune the radio, in place of a rather expensive variable capacitor.

Hook the coil and 350 pF cap in parallel and feed the
earphone/resistor/0.01 uF capacitor combination through the 1N34A, attach
antenna and ground, and voila, you have a radio.

As an alternative, consider using a varactor diode and potentiometer to
tune the radio. You could build a little regen set around an MPF102, a
home-made coil, a varactor and potentiometer tuning arrangement, and a
crystal earphone.

Regards,
-Steve

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


From [e-mail] Thu Sep 12 16:47:33 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-chi-8.sprintlink.net!tezcat!cam-news-hub1.bbnplanet.com!www.nntp.primenet.com!nntp.primenet.com!news.sgi.com!news1.best.com!sdd.hp.com!hp-pcd!hpbs2500.boi.hp.com!news
From: dave eckhardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Simple (Inexpensive) Radio Kits?
Date: Mon, 09 Sep 1996 15:44:01 -0700
Organization: Hewlett-Packard Co.
Lines: 53
Message-ID: <[e-mail]>
References: <50ndol$[e-mail]> <[e-mail]>
NNTP-Posting-Host: hpgreck.gr.hp.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.01 (Win16; I)
To: Steve Byan <[e-mail]>
CC: [e-mail]

Steve Byan wrote:
>
> In article <50ndol$[e-mail]>, [e-mail] (N2TKX) wrote:
>
> > Does anyone know of a source for very inexpensive radio kits - like less
> > than $5.00?
>
> No, but you should be able to homebrew a crystal set for about that - $.30
> for the 1N34A detector, several bucks for the crystal earphone, $.60 for
> the 10K resistor and 0.01 uF cap to parallel with the earphone, and $.50
> for a fixed 350 pf cap. I'll assume you scavange some fine enameled wire
> from a TV flyback transformer or some such. Wind a 250 uH coil on a 2"
> paper mailing tube form and  coat it with shellac to keep things together.
> Take some sheet brass or phosphor-bronze and make a sliding contact for
> the coil. Sandpaper off the insulation in a 1/4 inch wide strip where the
> slider makes contact along the coil. Arrange for the sliding contact to
> short the end of the coil, and you have a variable inductor that you will
> use to tune the radio, in place of a rather expensive variable capacitor.
>
> Hook the coil and 350 pF cap in parallel and feed the
> earphone/resistor/0.01 uF capacitor combination through the 1N34A, attach
> antenna and ground, and voila, you have a radio.
>
> As an alternative, consider using a varactor diode and potentiometer to
> tune the radio. You could build a little regen set around an MPF102, a
> home-made coil, a varactor and potentiometer tuning arrangement, and a
> crystal earphone.
>
> Regards,
> -Steve
>
> --
> Steve Byan                                  internet: [e-mail]
> Hitachi Computer Products (America), Inc.
> 1601 Trapelo Road                           phone: [phone]
> Waltham, MA 02154                           FAX: [phone]



Steve:

Just one further thought.  As a kid (now 50) I even collected my own
galena and made that work.  We didn't even have Schottky diodes in those
days.  a 1N34 was high tech!  White (grey) razor blades also work as does
pyrite and powdered (rusty) iron filings.  Galena is best.  I note you
are in Ma.  I know you can collect galena and pyrite at the Sterling
Hill Museum near Franklin, NJ.  I had a lot of fun as a kid trying to
find the "most sensitive" spot on the small crystal.  I even managed HCJB
- Quito, Equador - on my galena crystal radio one night from central
Michigan!  Have fun - combine a mineralogy/mining trip with building a
cheap radio!

Dave - W7LEV


From [e-mail] Thu Sep 12 16:47:34 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!newspump.sol.net!spool.mu.edu!newshub.tc.umn.edu!mr.net!news.clark.net!not-for-mail
From: [e-mail] (richard l wilder k3di)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: restore antique radio
Date: 5 Sep 1996 15:42:12 GMT
Organization: Arnold Maryland
Lines: 24
Message-ID: <50msck$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: 100-explorer2.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]

Jay Ritch ([e-mail]) wrote:
: Would like some guidance in restoring a Sear & Roebuck model 1996
: (wood cabinet "weather and foreign bands" cica 1930).
:    All tubes installed, don't know condition.
: Batteries missing, must build power supply for +22.5 vdc, +180 vdc.
: What i don't know is the voltage on the + and - terminals of the
: "type A" battery.      : HELP?!?      : e-mail to [e-mail]

First, probably the 22.5 vdc is a "C" battery (grid bias).  If so,
then it is conected as -22.5 vdc.

The main problem is the "A" battery.  That lights the filaments of the
tubes.  You can determine this by looking up the tube types in a manual
and finding the filament voltage specification.  If you don't have a
manual, email me the tube type numbers and I may be able to look them up.
At that time, the type 24A, 27, and 45 were popular tubes.

During the late 40's, while in high school, I had fun playing with junk
radios from he 30's.  They were, of course, hand wired so you should be
able to trace the wires from the +A and -A leads to check that they did
not do a mix series and parallel wiring.

73, Dick Wilder, K3DI    [e-mail]



From [e-mail] Thu Sep 12 16:47:35 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.net66.com!jolt.pagesat.net!ipac.net!news.netserv.com!newsfeed1.aimnet.com!www.nntp.primenet.com!nntp.primenet.com!news1.best.com!nntp1.best.com!shellx.best.com!not-for-mail
From: [e-mail] (Stephen Muther)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: restore antique radio
Date: 5 Sep 1996 12:46:58 -0700
Organization: BEST Internet Communications
Lines: 36
Message-ID: <50nani$[e-mail]>
References: <[e-mail]> <50msck$[e-mail]>
NNTP-Posting-Host: shellx.best.com
~Cc:

In article <50msck$[e-mail]>,
richard l wilder k3di <[e-mail]> wrote:
>Jay Ritch ([e-mail]) wrote:
>: Would like some guidance in restoring a Sear & Roebuck model 1996
>: (wood cabinet "weather and foreign bands" cica 1930).
>:    All tubes installed, don't know condition.
>: Batteries missing, must build power supply for +22.5 vdc, +180 vdc.
>: What i don't know is the voltage on the + and - terminals of the
>: "type A" battery.      : HELP?!?      : e-mail to [e-mail]
>
>First, probably the 22.5 vdc is a "C" battery (grid bias).  If so,
>then it is conected as -22.5 vdc.
>
>The main problem is the "A" battery.  That lights the filaments of the
>tubes.  You can determine this by looking up the tube types in a manual
>and finding the filament voltage specification.  If you don't have a
>manual, email me the tube type numbers and I may be able to look them up.
>At that time, the type 24A, 27, and 45 were popular tubes.
>
>During the late 40's, while in high school, I had fun playing with junk
>radios from he 30's.  They were, of course, hand wired so you should be
>able to trace the wires from the +A and -A leads to check that they did
>not do a mix series and parallel wiring.
>
>73, Dick Wilder, K3DI    [e-mail]
>

If you want to keep running the radio off batteries (as was originally
designed) you can make your own C and B batteries using series
combinations of 9V batteries purchased from bulk supply stores like
Costco etc. I have made some 90V B batteries for a Transocianic using
that method. The contacts are easy to solder to and the batteries last
quite a while since the current draw is low.

Steve Muther WF6R



From [e-mail] Thu Sep 12 16:47:36 1996
Path: news2.epix.net!news3.epix.net!uunet!in2.uu.net!cam-news-hub1.bbnplanet.com!howland.erols.net!www.nntp.primenet.com!nntp.primenet.com!news-peer.gsl.net!news.gsl.net!ix.netcom.com!news
From: [e-mail](Glenn Sparks)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: restore antique radio
Date: 5 Sep 1996 20:39:32 GMT
Organization: Netcom
Lines: 38
Message-ID: <50ndq4$[e-mail]>
References: <[e-mail]> <50msck$[e-mail]> <50nani$[e-mail]>
NNTP-Posting-Host: hou-tx14-19.ix.netcom.com
X-NETCOM-Date: Thu Sep 05  1:39:32 PM PDT 1996

In <50nani$[e-mail]> [e-mail] (Stephen Muther)
writes:
>
>In article <50msck$[e-mail]>,
>richard l wilder k3di <[e-mail]> wrote:
>>Jay Ritch ([e-mail]) wrote:
...
... snip
...
>
>If you want to keep running the radio off batteries (as was originally
>designed) you can make your own C and B batteries using series
>combinations of 9V batteries purchased from bulk supply stores like
>Costco etc. I have made some 90V B batteries for a Transocianic using
>that method. The contacts are easy to solder to and the batteries last
>quite a while since the current draw is low.
>
>Steve Muther WF6R
>
I'm not familiar with that radio, but check if your library has Riders
or Sams manuals on Microfiche, some do, and check them.

I would recommend staying with batteries, the radio's built to use
batteries don't like even a hint of ripple.

An electronic store that has surplus telephone stuff with have nice
1 1/2 volt cells, to series for filament, if you need more than 1.5
volts.

They will also have 45 and 90 volt cells, with some of 45's tapped for
22 1/2.

Altex in Austin still has Eveready "B" cells, I noticed a while back,
but at 17.50 for 45 volt cell the 9 volts are cheaper but not original.

Good Luck

Glenn Sparks  KI5GY


From [e-mail] Thu Sep 12 16:47:37 1996
Path: news2.epix.net!news3.epix.net!uunet!in2.uu.net!newspump.sol.net!www.nntp.primenet.com!nntp.primenet.com!news.sgi.com!news.goodnet.com!news
From: [e-mail] (Eric Oyen)
Newsgroups: rec.radio.amateur.homebrew
Subject: FCC Issues NAL
Date: Thu, 05 Sep 1996 18:13:50 GMT
Organization: goodnet.com
Lines: 18
Message-ID: <50n8ke$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: tempe-ts10-9.goodnet.com
X-Newsreader: Forte Free Agent 1.0.82

The following was received from the FCC Daily Digest for immediate
publication:
******************************************************************************
***********
Daily Digest

Vol. 15 No. 166
September 5, 1996

PHOENIX. AZ.  Issued a further notice of apparent liability in the
amount of $6,000 against Timothy Harold Hoffman, Phoenix, Arizonia,
for violations of various amateur radio rules.  Action by Chief,
Compliance Division, Compliance and Information Bureau.  Adopted:
August 30, 1996 by FNAL.  DA No. 96-1478.  CIB  Internet URL:
index.html

                                                - FCC -




From [e-mail] Thu Sep 12 16:47:40 1996
Path: news2.epix.net!news3.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news1.mnsinc.com!usenet
From: [e-mail] (Brian Carling)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Homebrewing for the less-than-affluent (was: "Commercial CW use")
Date: Thu, 05 Sep 1996 23:29:26 GMT
Organization: Monument Network Services Inc.
Lines: 36
Distribution: inet
Message-ID: <50o29f$[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]> <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: bry.mnsinc.com
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Gary Coffman) whistled a happy tune like:

|In article <[e-mail]> [e-mail]
(Joe Pritchard) writes:
|>Tovar <[e-mail]> wrote:
|>
|>>So what are my options?  Is there much that one can do in the RF realm
|>>without a lot of money or learning CW first?

|Pardon me for following up Joe's message, but the original didn't
|make it here. Let me address what one can do without learning CW
|first. In a short sentence, the answer is "anything you wish outside
|of HF." Current regulations limit you to only receiver, accessory,
|and antenna projects for HF if you don't pass a Morse test, IE no
|transmitting. While those things are interesting in and of themselves,
|they're more SWL than amateur radio. Above 30 MHz, however, the whole
|world of amateur radio is open to you.

Joe - and Gary - for information about sources of parts to build such
equipment, kits from simple to advanced etc., call in to my Web Site for
free information. I am not selling ANYTHING!

http://www.mnsinc.com/bry/

SHORT DESCRIPTION:
Amateur Radio, Electronics,
Shortwave/Pirate Radio, Ice Hockey, UK/US English Dictionary,
picture of me, many hot links, files etc.

The site name is:
"MEGALIST + HAM RADIO + HOCKEY = Bry's Homepage"
E-mail: [e-mail]
http://www.mnsinc.com/bry/index.html
TRY MY WEB-SITE please!
See if I look as ugly as you would expect!



From [e-mail] Thu Sep 12 16:47:41 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!holonet!colossus.holonet.net!woodybbs!9!1:2619/211!douglas.dwyer.
From: Douglas.Dwyer.%1:2619/211.9 (Douglas Dwyer %1:2619/211.9)
Date: 03 Sep 96 04:06:02
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Low TCR variable resistor for RF application?
Message-ID: <[e-mail]>
Organization: WoodyWare Software, Inc.
Lines: 46

To: Douglas Dwyer %1:2619/211.9%12:320/100.666
From: Douglas Dwyer <[e-mail]>
Subject: Re: Low TCR variable resistor for RF application?
Organization: FP

In article <509ndj$[e-mail]>, David A Nickel
<[e-mail]> writes
>I'm working on a project that uses a Wheatstone bridge to measure the
>really fast fluctuations from a resistance-based sensor (the whole
>fluctuation lasts a few microseconds, and we'd like to see
>sub-microsecond events during the interval).  I make various sensors
>with different nominal resistances, so I'd like to use a variable
>compensating resistor that I can "tune in" to balance the bridge.
>
>The relative resistance change from the sensor is small (1000's of
>ppm full scale), so I would like a stable compensating resistor --
>thermal drift is annoying, mechanical noise is deadly.
>
>What kind of variable resistor could I use to select a value
>from 100 to 1000 Ohms, tunable to about 1 Ohm, stable to 0.1 milliOhm,
>that's mostly a resistor at 10 MHz?

I needed a noninductive variable resistor to balance an RF bridge up to
200MHz to measure crystals. The sucessful solution was to temperature
control a thermistor, employing temperature to adjust resistance. Use
NTC thermistor, mount two thermistors and a heater on a block.
Regards

Douglas Dwyer
Frequency Precision Ltd
Shorts Northlew Okehampton Devon UK EX20 3NR
Consultant and Designer for Analog, RF, Crystal Oscillators,
TCXOs, OCXOs, SAWOs, Sensors.
Phone/Fax [phone]
Web page http://ourworld.compuserve.com/homepages/frequency_Precision/


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|Fidonet:  Douglas Dwyer %1:2619/211.9 2:301/249.666
|Internet: Douglas.Dwyer.%1:2619/211.9
|
| Standard disclaimer: The views of this user are strictly his own.



From [e-mail] Thu Sep 12 16:47:42 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!holonet!colossus.holonet.net!woodybbs!666!12:320/100!9!1:2619/211!py2rn.
From: PY2RN.%1:2619/211.9%12:320/100.666 (PY2RN %1:2619/211.9%12:320/100.666)
Date: 04 Sep 96 18:04:00
Newsgroups: rec.radio.amateur.homebrew
Subject: FT5200 9600??
Message-ID: <[e-mail]>
Organization: WoodyWare Software, Inc.
Lines: 23

From: PY2RN <[e-mail]>
Subject: FT5200 9600??
Organization: SP-GW.AMPR.ORG

Hi,

If you know how to make the Yaesu Ft-5200 operational on packet
at 9600bps (Where do I connect the tx/rx wires) could you please
send it to me?

Thank you.

Ed, PY2RN

 # Origin: Usenet:SP-GW.AMPR.ORG (1:2619/211.9)

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|
| Standard disclaimer: The views of this user are strictly his own.



From [e-mail] Thu Sep 12 16:47:43 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!newsfeed.internetmci.com!howland.erols.net!vixen.cso.uiuc.edu!sdd.hp.com!col.hp.com!canyon.sr.hp.com!joeld
From: [e-mail] (Joel Dunsmore)
Newsgroups: sci.electronics.components,sci.electronics.basics,rec.radio.amateur.homebrew
Subject: Re: What is a Gunn diode ?
Followup-To: sci.electronics.components,sci.electronics.basics,rec.radio.amateur.homebrew
Date: 5 Sep 1996 23:18:14 GMT
Organization: Hewlett Packard Sonoma County
Lines: 36
Message-ID: <50nn3m$[e-mail]>
References: <4vhlep$[e-mail]> <4vjfpn$[e-mail]> <[e-mail]> <50df7j$[e-mail]>
NNTP-Posting-Host: hpsrjpd.sr.hp.com
X-Newsreader: TIN [version 1.2 PL2.2]
Xref: news2.epix.net sci.electronics.components:7264 sci.electronics.basics:7996 rec.radio.amateur.homebrew:16695

Jim Gyer ([e-mail]) wrote:

: I disagree with Douglas J. Mar ([e-mail]) below.  If
: it, there is a area where the slope is negative.  That is: take two

And Doug Mar Said:

: >Nitpick: the term should probably be "negative differential resistance" or
: >  "negative incremental resistance", for both Gunn and tunnel diodes, since
: >  the slope of the I-V curve is always positive.  The "negative resistance"
: >  region is that over which the resistance _decreases_ for increasing bias,
: >  but it still remains positive.  (It's possible to use active devices to
: >  construct a negative resistance (or impedance).

More Nits:  Both right (or both wrong).

The slope DOES go negative (dV/dI < 0) so the differential resistance (or
small signal resistance) does indeed go negative.  But the resistance (V/I) is
always positive.

One way to think of it is that you DC bias the diode in the negative differ-
ential resistance region using DC current, then you put a small signal AC
circuit around the diode, coupling energy in and out (for an amplifier), or
simply making a feedback loop with a narrow band width for an oscillator, and
you will get AC signal out with no AC in.  But you will always burn up more
DC power than the AC signal you get, usually a lot more.

Gunn diodes come from the Gunn effect in bulk GaAs material where the
mobility of the electrons slows as the elecectron density increases, forming
"wave like" regions of bunched up electrons, called Gunn domains.  These
have the effect of causing the current to be reduced if the voltage is
further increased, thus negative differential impedance.  Gunn modes often
happened in early GaAs FETs, and these were very undesired,as they could
cause spurious oscillations in amplifiers.

Joeld.


From [e-mail] Thu Sep 12 16:47:44 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!holonet!colossus.holonet.net!woodybbs!9!1:2619/211!hugh.duff
From: Hugh.Duff%1:2619/211.9 (Hugh Duff%1:2619/211.9)
Date: 02 Sep 96 22:29:28
Newsgroups: rec.radio.amateur.homebrew
Subject: Homebrew SINAD meter ?
Message-ID: <[e-mail]>
Organization: WoodyWare Software, Inc.
Lines: 25

To: Hugh Duff%1:2619/211.9%12:320/100.666
From: [e-mail] (Hugh Duff)
Subject: Homebrew SINAD meter ?
Organization: ICA Canada

Looking for details on homebrewing a SINAD meter.
Means of display is not important. I'm mainly interested
in the method of sampling so I can process it with a microcontroller.

Comments, Ideas,  references to past construction artlicles
appreciated !

Thanks,
Hugh Duff  VA3TO  Toronto


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|
| Standard disclaimer: The views of this user are strictly his own.



From [e-mail] Thu Sep 12 16:47:45 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!holonet!colossus.holonet.net!woodybbs!9!1:2619/211!jim.gyer
From: Jim.Gyer%1:2619/211.9 (Jim Gyer%1:2619/211.9)
Date: 01 Sep 96 22:14:37
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HELP: IS PC SWITCHING POWER SUPPLY OK???
Message-ID: <[e-mail]>
Organization: WoodyWare Software, Inc.
Lines: 65

To: Jim Gyer%1:2619/211.9%12:320/100.666
From: [e-mail] (Jim Gyer)
Subject: Re: HELP: IS PC SWITCHING POWER SUPPLY OK???
Organization: Just my little old self

No problem with switchers per se, but pirateing a computer supply is
not without its problems.

All switchers require a minimum load.  In many computer supplies its
the fan.  Some assume some minimum load on the mother board.  They go
out of regulation or stop oscillating and smoke with less than the
minimum current draw.

My ICOM IC740 has the optional built-in 13.8 volt supply and it works
fine but it was designed for communications.

There is a big difference between 12 volts and 13.8 volts.  In the
case of my Radio Shack HTX-202 2 meter handy-talky it's 6 Watts at
13.8 and 5 W at 12.0.  That's a 20% drop in power.  Most mobile
equipment assumes a vehicle with a running alternator which is where
the 13.8 value comes from.

Best
Jim Gyer KC7RKL ([e-mail])
====================================================================

[e-mail] (Bry) wrote:

>The other bad problem with many of those old switcher power supplies is
>that they generate a lot of RF hash!

>[e-mail] (Big Boy) scribbled:

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

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

>|E-mail me on that please...

>|Thanks and 73 to all readers

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

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



 # Origin: Usenet:Just my little old self (1:2619/211.9)

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|Fidonet:  Jim Gyer%1:2619/211.9 2:301/249.666
|Internet: Jim.Gyer%1:2619/211.9
|
| Standard disclaimer: The views of this user are strictly his own.



From [e-mail] Thu Sep 12 16:47:46 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!rjo02.embratel.net.br!news.unisys.com.br!news.uoregon.edu!csulb.edu!info.ucla.edu!agate!spool.mu.edu!munnari.OZ.AU!harbinger.cc.monash.edu.au!newsserver.trl.OZ.AU!usenet
From: Glenn Baddeley <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help:  Need specs on some power diodes (thanks to all)
Date: Thu, 12 Sep 1996 08:29:27 -0700
Organization: Telstra
Lines: 63
Message-ID: <[e-mail]>
NNTP-Posting-Host: 144.135.1.54
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
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CC: [e-mail]

Thanks to the following people who provided the specs
I wanted on the various diodes:

Jim <[e-mail]>
Mark <[e-mail]>
Tom WA1RHP <[e-mail]>
Charlie KX7L <[e-mail]>
Tom WB6IQD <[e-mail]>

Some WWW sites were also useful:
http://www.nteinc.com/
http://www.natsemi.com/
http://www.mot.com/

For the record, this is what I ended up with:

GE A327B        Si, GP Rectifier, 18A, VRRM 200, VF 1.3.
                Replaceable with MR1122 (12A 200V)

NAE 1N1202A     200PRV, 12A, Cathode Case.
                Replaceable with NTE 5874

IR 20FQ035      Schottky Rectifier
                Vrrm = 35V
                If(avg) = 30A at 111 deg C
                Vfm = 0.47V at Ifm (but they don't say what Ifm is)
                Eas = 40 mJ
                Iar = 4A (current decaying to zero in 1usec)
                Irm = 150mA at Vrwm
                Max Tj = 150 deg C.
                If follows IR part numbering system, it's
                a 20 amp diode.
                Replaceable with MBR3535 (35A 35V).
                Replaceable with NTE6084 (35A 45V).

M 1901-0630     Used in HP computer power supply.
                This is a Motorola MR1123R,
                Vrev (repetitive) = 300V
                Vrev (Non-Repetitive) = 400V
                If(avg) = 12.0 A
                If(pk)  = 75.0 A
                If(peak surge) = 300A (half wave of 60 Hz sine)
                Vf = 1.0V at 12A
                Irev = 0.5 mA at 300V
                Thermal resistance 2.5 deg C/W

M 1-1035        Used in HP computer power supply.
                1901-1035 == Motorola MR881R
                Vrmax = 100V
                Ifpk(repetitive) = 12A
                Reverse recovery time = 1uS
                One cycle surge current = 200A
                Max Vf at 12A = 1.4V
                Leakage current at Vrmax = 0.5mA

TRW SD51        Schottky, 45PRV, 60A, Cathode Case.
                Replaceable with NTE 6094 (45PRV, 60A)

Cheers,
Glenn <[e-mail]>
Melbourne, Victoria, Australis

========= The world is a data book ============


From [e-mail] Thu Sep 12 16:47:47 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!howland.erols.net!news-peer.gsl.net!news.gsl.net!portc01.blue.aol.com!newsstand.cit.cornell.edu!news.acsu.buffalo.edu!news.drenet.dnd.ca!crc-news.doc.ca!nott!cunews!freenet-news.carleton.ca!FreeNet.Carleton.CA!bk296
From: [e-mail] (Gordon Symonds)
Newsgroups: rec.radio.amateur.homebrew
Subject: WTB: 6" Ceramic Spreaders for Open Wire Line
Date: 12 Sep 1996 17:37:54 GMT
Organization: The National Capital FreeNet
Lines: 9
Sender: [e-mail] (Gordon Symonds)
Message-ID: <519hpi$[e-mail]>
Reply-To: [e-mail] (Gordon Symonds)
NNTP-Posting-Host: freenet3.carleton.ca


I need enough spreaders for a 1/4 wave open wire line at 80m.  6"
spacing preferred, as that will give 600 ohm surge impedance with
12 ga wire.

I have had varying opinions about how many I need, probably at least
30 for the 60+ ft feeder.

This is for a 1927 transmitter project, thanks for any help.


From [e-mail] Thu Sep 19 18:13:00 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!cs.utexas.edu!howland.erols.net!EU.net!usenet2.news.uk.psi.net!uknet!usenet1.news.uk.psi.net!uknet!dispatch.news.demon.net!demon!nrnegus.demon.co.uk!nrnegus
From: Nicholas Negus <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: 2M linear PA problem
Date: Fri, 13 Sep 1996 11:59:15 +0100
Organization: Home
Lines: 25
Distribution: world
Message-ID: <[e-mail]>
References: <516fe8$[e-mail]>
NNTP-Posting-Host: nrnegus.demon.co.uk
X-NNTP-Posting-Host: nrnegus.demon.co.uk
MIME-Version: 1.0
X-Newsreader: Turnpike Version 1.10 <gFCpp4XJvWc15jzAYBwCAEAYkp>

In article <516fe8$[e-mail]>, [e-mail]
sson.se writes
>Got a 'ex.linear' transistor final amp. for 144MHz.
>On SSB the PA sounds very bad, according to
>the guys on the band.
>It is a 12VDC two-transistor PA with a gasfet preamp.
>MIRAGE rated 160W output, but i'd rather say 125W
>at the moment.
>
>I want to get the PA into shape again, and need
>some hints on what-to-check, bias, current balance
>on the transistors etc..
>
>Chris SM0NCL, now QRP on 2M
>
>
Hi Chris,

Sounds like you might be over driving the PA input. I think this unit
only needs a maximum of 3 watts.

Regards, Nick, G6AWT (UK).

--
Nicholas Negus


From [e-mail] Thu Sep 19 18:13:01 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!tezcat!cam-news-hub1.bbnplanet.com!howland.erols.net!newsfeed.internetmci.com!news.bctel.net!news.mag-net.com!ve7tcp.ampr.org!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Henry G. Souchet)
Newsgroups: rec.radio.amateur.homebrew
Subject: 9H1CD - SUBSCRIBE
Date: 15 Sep 96 06:56:19 GMT
Organization: 9H1CD
Lines: 1
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

add ham-homebrew   [e-mail]


From [e-mail] Thu Sep 19 18:13:05 1996
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From: [e-mail] (Gary Schwartz)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: A not so obvious resistor question.
Date: 16 Sep 1996 05:04:56 GMT
Organization: Solaria Public Access UNIX - Milwaukee, WI
Lines: 35
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W8JI  Tom%1:2619/211.9 (W8JI..Tom%1:2619/211.9) wrote:


: Still do. I get them from Allen Bradly and Stack Pole.

Not for much longer!



: Now think of this...... Inductance when used as a parasitic suppressor.
: The only real low inductance resistor is a carbon comp type, and almost no
: one makes them except Allen Bradly. I specify them for parasitic
: suppressors AND small energy absorbing applications....but *not* in
: applications where resistance drift is critical or long term excessive
: temperature operation is expected.

I saw something come across my desk about a month ago.  Allen Bradley will
no longer be manufacturing carbon composition resistors.  As far as I
know, they are the last manufacturer to make CC resistors, at least in the
1/4 to 10 Watt power range.  There may still be someone making the big
'uns somewhere.


--
73,
Gary K9GS
   __________________
  /       K9GS       |______________________________
 /   FP/K9GS, TO5M   |Society of Midwest Contesters |____________________
(                    |   [e-mail]   |Secretary/Treasurer/
 \   Gary Schwartz   |   [e-mail]    | Greater Milwaukee/
  \__________________|     PacketCluster: NB9C      |  DX Association (
                   (________________________________|       GMDXA      \
                              KNOW CODE !         (_____________________\



From [e-mail] Thu Sep 19 18:13:06 1996
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Newsgroups: rec.radio.amateur.homebrew
Subject: Best Turnkey Package
Message-ID: <[e-mail]>
From: Tenley Shewmake <[e-mail]>
Date: Sun, 15 Sep 1996 19:07:36 -0400
Nntp-Posting-Host: 129.71.52.171
Lines: 18

To all,

We are looking for a simple rugged, TURNKEY, resellable, FCC approved device
for transmitting serial data to a palm top PC from our weatherstation.

Range: 1 mile max

Problems: EMI, other nearby communication devices, this is a little
        outside our field (custom weatherstations), 12v power supply

What's available?  Who can we talk to?

Thanks in advance for any information.

Tenley Shewmake [e-mail]





From [e-mail] Thu Sep 19 18:13:07 1996
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From: Jim <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Boatanchor newsgroup update
Date: 13 Sep 1996 18:43:32 GMT
Organization: IdeaSource
Lines: 11
Message-ID: <51ca0k$[e-mail]>
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The first CFV for this long-debated new newsgroup has been forwarded to
the news.announce.newgroups moderator, and vote-taking will begin in a
few days.

When you see the CFV for this new newsgroup, please take a moment
to vote.  A lot of people have spent a lot of time getting the proposal
ready.

N6OTQ




From [e-mail] Thu Sep 19 18:13:10 1996
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From: [e-mail] (Rich & Katy Mulvey)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: BULLETIN: 14 Year Old Sailor Not Heard in 3 Weeks
Date: 14 Sep 1996 15:27:23 GMT
Organization: Mulvey Home Node
Lines: 37
Message-ID: <[e-mail]>
References: <51aimv$[e-mail]> <[e-mail]> <51efhs$[e-mail]>
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On 14 Sep 1996 14:30:20 GMT, Gerald Schmitt <[e-mail]> wrote:
>In <[e-mail]> [e-mail] (Thomas G. McWilliams)
>writes:
>>
>>Ed Mitchell ([e-mail]) wrote:
>>: 14 year old Subaru Takahashi is making a solo crossing of the
>Pacific Ocean
>>: from Japan to the United States - in a 30 foot yacht. According to
>Masa
>>: Sakamoto, KN6RJ, Subaru, who's call sign is JH0YCG, has not been
>heard since
>>: August 18th.
>>
>>Most probably, Master Subaru sleeps with the fishes.
>>Talking to a dead man on ham radio--now that would be some DX!
>>But what a great QSL card . . .
>>
>
>Boy Tom you are some piece of work; the guys asks for help and this is
>what you come up with. What ever happened to the amateur service
>creedo. You know Sakamoto san's family could just easily read this,
>talk about ugly Americans. You sir are an embarassment to the hobby.
>


   It just goes to show that you can't escape from the morons, anywhere
you go.

   On a more pleasant note, Takahasi arrived in SF bay yesterday afternoon.


--
My mailer has the unfortunate tendency to bounce 10,000 copies of any
junk mail I receive back to the sender.  Be warned.





From [e-mail] Thu Sep 19 18:13:11 1996
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From: <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: can Drake one-up Japanese $5000 computers (radios?)
Date: 15 Sep 1996 19:49:21 -0400
Organization: Yale CS Mail/News Gateway
Lines: 43
Sender: [e-mail]
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: babyblue.cs.yale.edu

Was going to put in order to JAN Crystals for about $150 of range
crystals for R4-C:  two for each WARC band, and one each for the major
SW broadcasting bands.

However, I heard that you guys still sell these.  Is this true?  I
though I had heard before that you no longer did this.

Also, do you know anything about proposal from Network Sciences to
start manufacturing filters for Drake (and Collins) again?  They put
out a survey to see if there was interest and I responded in
affirmative.
--------------more importantly:

Here have homebuilt rcvr I call R4-DMOS.  Uses same premix scheme as
R4-C, but has Makhinson Front End and DMOS commutating mixer.
Provides 112 db dynamic range with preamp *on*.   Has synchronous
sample-and-hold AM demod that doubles as product detector for cw and
ssb.

Also uses variable varactor tuned IF amp/IF filter in distributed
topology, which replaces $100's of filters.

A hybrid DDS/PLL ultra low noise synth is in the making for the rcvr.
Just need to make uP controller for the hardware.

If I can build such a rcvr for a few hundred dollars, why can't you
guys????

You could capitalize on the fact that most
rf designers would be embarrassed to be on the design team of one of
those $5000 Japanese rigs that has poorer performance than some of the
circuits in the 1970's "Solid State Design for the Radio Amateur"
book.

If Drake would make such a xcvr/rcvr I would buy it.  It wouldn't be a
question of which disributor has the better price, etc etc  Or who can
spend the most advertising dollars- it would be clear techological
superiority,. and everyone except the most green CBers turned
no-coders would tell the difference.

I hope you pass this email to your higher-ups.

Thanks, Rob.


From [e-mail] Thu Sep 19 18:13:12 1996
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From: "Ian White, G3SEK" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Catalog by Farnell - do you have phone#?
Date: Tue, 17 Sep 1996 13:08:01 +0100
Organization: IFW Technical Services
Lines: 18
Distribution: usa
Message-ID: <[e-mail]>
References: <[e-mail]>
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David Feldman wrote:
>I'm trying to find a catalog vendor by the name of "Farnell". Does anyone
>have their catalog? What is their phone number?

In England it's: Farnell Components, Canal Road, Leeds LS12 2TU
Tel [phone]
Fax [phone]

Farnell also own Newark Electronics in the USA, and has just started to
sell Newark's product lines in Britain. Does anybody know if the two
companies are also integrating in the USA?



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


From [e-mail] Thu Sep 19 18:13:14 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!www.nntp.primenet.com!nntp.primenet.com!netcom.com!dgf
From: [e-mail] (David Feldman)
Subject: Catalog by Farnell - do you have phone#?
Message-ID: <[e-mail]>
Organization: Organization? Me?
Distribution: usa
Date: Mon, 16 Sep 1996 22:23:34 GMT
Lines: 7
Sender: [e-mail]

I'm trying to find a catalog vendor by the name of "Farnell". Does anyone
have their catalog? What is their phone number?

Thanx,

73 Dave WB0GAZ [e-mail]



From [e-mail] Thu Sep 19 18:13:15 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Crystal sets again... and the usual nostalgia &c
Date: 14 Sep 96 09:15:58 EST
Organization: Wright State University
Lines: 48
Message-ID: <[e-mail]>
NNTP-Posting-Host: nova.wright.edu

Ah, crystal sets! I just finished fixing one up for my
youngest. It's a modified version of the Modern Radio Labs
#2 DX crystal set. Instead of a tapped coil, I gave the
set a "slider." So far it has managed SW -- picked up some
kind of Japanese program last night... And BBC is a piece
of cake -- and a lot of local stations. Nice set up.

I've also started building another set for myself, using
a modified version of the MRL #2 and a "Navy Loose Coupler"
set up for selectivity/antenna matching. That one's gonna
be a monster, 'cause the largest of the two coils is about
3 inches in diameter. One option that I'm leaving for myself
is (a) switchable detector options and (b) rheostat control
of bias voltage for a carborundum detector.

The beauty of crystal sets -- at least to me -- is their
inherent simplicity and the pleasure of making a radio that
works for free. They teach some interesting theory of L/C
circuitry and coupling-vs-selectivity/sensitivity, and they
allow the builder/user/youngster/curmudgeon-turned-nostalgic
to relive a small chunk of the history of socio-scientific
magic.

I also might add that Peter Jensen's (VK2AQJ/G4GZT) book
_In Marconi's Footsteps: 1894-1920: Early Radio_ is a wonderfully
well-written tour of the times and places of the beginnings of
the entire electronics/communication revolution of which this
computer connectivity is only a small but continuing part.
Jensen shows pictures, schematics, drawings, details and
construction hints of everything that means _real_ radio.
Tube sets he covers briefly. Crystal sets, coherers, quenched
and rotary sparks, antenna couplers, interrupters, and
magnetic detectors he covers in detail. I liked the book
so much -- borrowed a friend's copy first -- that I sprung
the $39 for a special order through the local book store.

And there's always MRL Handbook #3, _Crystal Detectors_ with
32 different minerals -- beyond PbS Galena -- that make for
interesting experiments with cats' whiskers and patient
probing of rocky surfaces. Too bad ol' Elmer ain't around
to see how much craziness radio loonies can get into... even
this far past the first arcs and sparks of some 85 years
ago.

73
Nils
WB8IJN &c



From [e-mail] Thu Sep 19 18:13:16 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: CW debate
Date: 16 Sep 96 17:12:19 GMT
Organization: ucsd usenet gateway
Lines: 21
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

Once again.  Please let's move the no-code/code debate back to
ham.policy!!!  This is all interesting but the *WRONG* place.

BTW Chris asked:

If the technical requirements of the license were dropped, how long
would it be before the FCC started mandating emmision tests on
homebrew equipment?

The answer to this question is 19 (?) years ago!!  Read part 97 and
you will see that about that time frame part 97 got added constraints
on spurious emmisions.  It's funny that there were no quantitative
requirements on harmonics/etc prior to that time.  I do recall in the
early 70's reading about folks getting nasty-grams from the FCC for
not suppressing harmonics adequately.

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



From [e-mail] Thu Sep 19 18:13:17 1996
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From: Garrie Jantzen <[e-mail]>
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew
Subject: Re: Do we build?  was(Re: ARRL SURVEY IGNORES 7 OF 8 WRC-99 ISSUES!
Date: 13 Sep 1996 18:59:47 GMT
Organization: Coos Bay Public Schools
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As long as CW is *allowed* (!) won't there always be other folks like
yourself -- interested in homebrew CW? I mean, people spend beaucoup
bucks to fly in balloons still! And ticket prices on steam railroads keep
going up. There will always be an England and, whatever the FCC decides,
I think there will always be CW



From [e-mail] Thu Sep 19 18:13:18 1996
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From: [e-mail] (Jerry Flanders)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew
Subject: Re: Do we build?  was(Re: ARRL SURVEY IGNORES 7 OF 8 WRC-99 ISSUES!
Date: Sat, 14 Sep 1996 17:51:51 GMT
Organization: Info Avenue INTERNET Access
Lines: 36
Message-ID: <51erah$[e-mail]>
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[e-mail] wrote:

>In <51cav3$[e-mail]>, Garrie Jantzen <[e-mail].k
12.or.us> writes:
>>As long as CW is *allowed* (!) won't there always be other folks like
>>yourself -- interested in homebrew CW? I mean, people spend beaucoup
>>bucks to fly in balloons still! And ticket prices on steam railroads keep
>>going up. There will always be an England and, whatever the FCC decides,
>>I think there will always be CW
>>

>Garrie,

>Thanks for making that point again ... it's something the pro-CW folks
>choose to ignore.

>I have NEVER, EVER, in over ten years of debating this issue, seen a
>no-code advocate actually advocate the *banning* of CW from the bands.
>Not once.  (of course, now that I've said that, one of the pro-coders
>will probably start up a phony "ban the code" thread in an effort to
>taint the discussion with a bunch of bogus anti-no-code distortions).

>Carl - wa6vse
>[e-mail]
==============================================================
BUT - those sections of the band reserved for non-phone uses shrink as
more and more phone operators crowd the remainder. In the '50's, 75
meters was only 200 kHz, and there was no phone on 40 at all!

I suspect that in 20-30 years, there will be no parts of the band
reserved for non-phone usage. It will all then be by "gentlemens
agreement".

Jerry    W4UKU    [e-mail]





From [e-mail] Thu Sep 19 18:13:19 1996
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From: Doug <[e-mail]>
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew
Subject: Re: Do we build?  was(Re: ARRL SURVEY IGNORES 7 OF 8 WRC-99 ISSUES!
Date: Sat, 14 Sep 1996 20:36:58 -0600
Organization: Altopia Corp. - Affordable Usenet Access - http://www.alt.net
Lines: 24
Message-ID: <[e-mail]>
References: <[e-mail]> <50fte2$[e-mail]> <[e-mail] <50nv1o$[e-mail]> <50ps5d$[e-mail]> <[e-mail]> <517q5o$[e-mail]> <51efp2$[e-mail]>
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The largest deficiency in the Hobby today lies in the mindset of those
who enter thinking Amateur Radio is a kind of "Advanced CB" world, and
who bring with them the same whining and culturally bankrupt attitudes
that prevail on 27 mhz.  This thinking is furthered by the present
perception that numbers alone will save us from being made fodder by
the ever increasing demands of a profit driven Communications Industry.

Morse, while certainly an ancient form of communication, is essentially
like any other language.  It is easy to learn and can be picked up by
children in a short time, why not the rest of the population?  It
strikes me that those who spend so much time complaining about the code
would more efficiently use the oxygen and resources they consume on this
earth by learning and teaching the code, therby ensuring it's future use
in our hobby.

A Filter??? Maybe not, but detractors should spend some time on 30
meters listening to the new Hams and how hard they work at becoming
proficient CW operators...it's heartening to hear.

Perhaps it would be better for all of us to heal the wounds that divide
us and present a united front at Warc.  Our enemies are many and their
percieved spectrum needs large.  I believe our entire hobby is at stake.

Doug, K7YD


From [e-mail] Thu Sep 19 18:13:22 1996
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From: "Paul Christenson [N3EOP]" <[e-mail]>
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew
Subject: Re: Do we build?  was(Re: ARRL SURVEY IGNORES 7 OF 8 WRC-99 ISSUES!
Date: Sun, 15 Sep 1996 12:14:55 -0700
Organization: Cyclades Corporation
Lines: 56
Message-ID: <[e-mail]>
References: <[e-mail]> <50fte2$[e-mail]> <[e-mail] <50nv1o$[e-mail]> <50ps5d$[e-mail]> <[e-mail]> <517q5o$[e-mail]> <51efp2$[e-mail]> <[e-mail]>
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Doug wrote:

> Morse, while certainly an ancient form of communication, is
> essentially like any other language.  It is easy to learn and can be
> picked up by children in a short time, why not the rest of the
> population?

If I'm going to "learn" any other languages, it's going to be something
a heck of a lot more useful; something like Japanese or Spanish.

> It strikes me that those who spend so much time
> complaining about the code would more efficiently use the oxygen and
> resources they consume on this earth by learning and teaching the
> code, therby ensuring it's future use in our hobby.

One question:  Why should we ensure its continued use?  It's slow, and
not terribly efficient as far as wpm per kHz go.  (20 wpm is less than 2
char/sec; 10 bits/sec if you encode it in a 5 bit system like Baudot.
That should need at most 10 Hz of bandwith.  CW needs a few hundred Hz.
I can get ten times that throughput, error free, using 300 baud packet
on HF, with not much more bandwidth.)

I don't know of anyone complaining about the USE of CW on the bands;
they are complaining about the REQUIREMENT of having to become
proficient at a higher-than-minimum speed in a mode they have absolutely
no desire to operate.

I have a degree in Electrical Engineering, specializing in digital
communications and computer science.  While my ham ticket was useful in
pursuing my degree, I had no need for knowing Morse (except for getting
my Tech ticket 10 years ago).  Even now, the only use that I have for
getting a higher class license is to shut up those people whose only
argument is that I'm simply trying to get out of learning the code.

> A Filter??? Maybe not,

Maybe???  Take a listen on 20m.  EVERY (legal) user of that band with a
US callsign passed a minimum of a 13 wpm code test.  It's worse than the
CB bands.

I think that the price of the radios makes a better filter than any kind
of CW exam.

> but detractors should spend some time on 30
> meters listening to the new Hams and how hard they work at becoming
> proficient CW operators...it's heartening to hear.

More power to them.  Nobody is proposing that CW operation be banned, or
even discouraged.

--
         +---------------------------------------------------+         .
         | Technical Support Engineer, Cyclades Corporation  |
         | 800/88-CYCLADES (882-9252) or [phone], x258 |
         | Maker of High Performance Multiport Serial Cards  |
         +---------------------------------------------------+


From [e-mail] Thu Sep 19 18:13:23 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!oronet!usenet
From: [e-mail] (Jim Weir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: evidently JAN crystals AOK
Date: Mon, 16 Sep 1996 18:23:56 GMT
Organization: RST Engineering
Lines: 20
Message-ID: <51k63i$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: rst-engr.oro.net
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] shared these priceless pearls of wisdom:

->Got alot of mail regarding question about JAN crystal quality.

I've been using JAN crystals both personally and professionally for
twenty-five years, even back when they called themselves Bob Whan and
Company.  Their current crystal engineer (Bill McCoy) knows as much about
crystals (and can explain it in plain Engineering English) as any person
I've ever met.

Good folks!!

Jim

Jim Weir VP Engineering | You bet your sweet patootie I speak for the
RST Engineering         | company.  If I don't, ain't nobody gonna.
Grass Valley CA 95945   |
http://www.rst-engr.com | AR Adv WB6BHI--FCC 1st phone---Cessna 182A N73CQ
[e-mail]        | Commercial/CFI-Airplane/Glider-A&P-FAA Counselor



From [e-mail] Thu Sep 19 18:13:24 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.net66.com!jolt.pagesat.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!EU.net!newsfeed.internetmci.com!in3.uu.net!comp.vuw.ac.nz!canterbury.ac.nz!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.digital,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.dx,rec.radio.amateur.policy,rec.ham-radio.swap,rec.ham-radio.packet
Subject: Re: Ham Radio as an *ENJOYABLE*  Hobby
Date: 13 Sep 1996 00:26:11 GMT
Organization: Psychology, University of Canterbury
Lines: 23
Distribution: world
Message-ID: <51a9n3$[e-mail]>
References: <[e-mail]> <[e-mail]>
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In article [e-mail] says...
>[e-mail] wrote:
>> The primary goal of the group will be to
fill an existing void by
>> providing an enjoyable forum for the
discussion of technical, operating
>> and social topics of interest to radio
amateurs.
>
Yes, This is a more positive role for HF
people. The HF bands will soon be recovering
from the Southern winter so those signals
from the antipodies will be coming through.
Take a look for the home-stations, mobiles.
During the third weekend of October is JOTA,
where amateur radio combines with the
scouting troops and camps, so another
opportunity for some pleasant operations,
with the Worlds Youth - in scouting.
On one occassion I QSO'ed to Tatum Park,
near Mancester, UK. during the period. 73
Winton at ZL3AO.



From [e-mail] Thu Sep 19 18:13:26 1996
Path: news2.epix.net!news3.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!hookup!news.nstn.ca!news.cs.indiana.edu!mcmcnews.er.usgs.gov!news.er.usgs.gov!gargantubrain.osmre.gov!news
From: [e-mail] (John Voigt)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Hamtronics VHF/UHF transverters any good?
Date: 16 Sep 1996 14:10:21 GMT
Organization: IN Dept of Natural Resources
Lines: 37
Message-ID: <51jn4d$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: locus.osmre.gov
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.6

In article <[e-mail]>, [e-mail] says...
>
>Anybody out there build (or buy) and use the Hamtronics VHF and UHF
>transmit and receive transverters?  Do they work well?  They seem quite
>reasonably priced.

Hi,

A couple of years ago I purchased the 220 MHz, as well as the 440 Mhz exciter
kits from Hamtronics (can't remember model #s). They were relatively easy to
assemble, but I think somewhat overpriced. The 440 version worked fairly well,

however, I would definitely recommend the TXCO or crystal oven option, since
it is nor exceptionally stable through even small temperature changes. The Tx
audio quality is acceptable, but not great. Nice compact design :)

The 220 MHz version is another story though. Although similar in design to the

aforementioned model, it has been nothing but trouble. It was crystalled to
work on 224.30, which it does, however, it has a spur of almost equal
magnitude on 448.60. Thinking it may have been a simple, common, or at least
previously reported problem, I called Hamtronics' tech support line for
assistance. The tech with whom I spoke, was rather disinterested and basically

stated that, since it was a kit, I had obviously constructed it wrong and it
wasn't their problem. I then asked assistance from a friend who is an
experienced Motorola technician, and he was equally stumped. He received
basically the same response from Hamtronics. At this point: <$100 kit is
useless.

The bottom line is: if you buy it assembled, it probably will work fine. If
you assemble it maybe - maybe not, but don't expect helpful, friendly support,

you're on your own. IMHO: Proceed with caution or go elsewhere.

Sorry about the long reply ;)

73,

John, K9GBO



From [e-mail] Thu Sep 19 18:13:27 1996
Path: news2.epix.net!news3.epix.net!uunet!in2.uu.net!news.internetMCI.com!news-admin
From: "Richard B. Joerger" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.equipment
Subject: Heath HW8 mods
Date: Mon, 16 Sep 1996 12:56:10 -0400
Organization: Racal-Datacom, Inc.
Lines: 14
Message-ID: <[e-mail]>
NNTP-Posting-Host: rdgw.racal.com
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Xref: news2.epix.net rec.radio.amateur.homebrew:16734 rec.radio.amateur.misc:106710 rec.radio.amateur.equipment:32365

Greetings All.

At this weeks Melbourne Hamfest (Fl) I picked up a Heath HW8 QRP rig.
Great condition and it works, but --- it seems a bit deaf.

I recall seeing a compendium of mods for this radio but can't find it.
Can anyone point me in the right direction?

TIA

Rich Joerger
WB4EHG
[e-mail]
[e-mail]


From [e-mail] Thu Sep 19 18:13:28 1996
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From: Michael Tracy <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Help!!!     Phone # for Jan crystals .......?????
Date: Fri, 13 Sep 1996 08:49:42 -0700
Organization: American Radio Relay League, Inc.
Lines: 12
Message-ID: <[e-mail]>
References: <01bb7440.67619d00$d5681fce@vigilant> <01bba10e$71c0dea0$[e-mail]>
NNTP-Posting-Host: mtracy.arrl.org
Mime-Version: 1.0
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> Does anyone out there have the phone number for jan crystals?????

Jan's number is 800-526-9825, which also translates as 800-JAN-XTAL for
those who have trouble remembering numbers.

--
Best Regards, Michael Tracy, KC1SX, ARRL Technical Information Services
-----------------------------------------------------------------------
American Radio Relay League, Inc.     Tel: [phone]
225 Main Street                       Fax: [phone]
Newington, CT 06111                   Email: [e-mail] (internet)
-----------------------------------------------------------------------


From [e-mail] Thu Sep 19 18:13:29 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!demos!news.stealth.net!news.ibm.net.il!arclight.uoregon.edu!chi-news.cic.net!ddsw1!news.mcs.net!nntp.wwwi.com!news.genuity.net!news.avatar.com!avatar.avatar.com!kory
From: Kory Hamzeh <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew
Subject: HF Amp Kits
Date: Mon, 16 Sep 1996 12:26:55 -0700
Organization: Avatar Consultants, Inc.
Lines: 11
Message-ID: <[e-mail]>
NNTP-Posting-Host: avatar.avatar.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Xref: news2.epix.net rec.radio.amateur.equipment:32370 rec.radio.amateur.homebrew:16736


Someone recently requested some info about HF amp kit manufacturer. I
missed most of the replies because I was away and we have a very short
expiration period here.

I would appreciate any information anyone can send me about kits.

Thanks,
Kory
AC6RN



From [e-mail] Thu Sep 19 18:13:29 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-dc-9.sprintlink.net!news.cdsnet.net!news.magicnet.net!news.sprintlink.net!news-fw-6.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!news.u-net.com!news
From: N Hampshire <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: ISSUE 2 OF ELECTRONICS ON THE WEB NOW OUT
Date: 17 Sep 1996 15:24:20 GMT
Organization: U-NET limited
Lines: 15
Message-ID: <51mfr4$[e-mail]>
NNTP-Posting-Host: emags.u-net.com

Hi,

Issue 2 of the practical electronics webzine 'Electronics on the Web'
is now out.

You can find it at the following URL:

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


We hope you find it interesting.

Nick Hampshire.

Editor


From [e-mail] Thu Sep 19 18:13:30 1996
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From: Mark G Robinson <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: JRC 5F65R tube info needed
Date: Mon, 16 Sep 1996 18:12:05 -0700
Organization: The Internet Group Ltd
Lines: 17
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: port90-auck.ihug.co.nz
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0b5a (Win16; I)

Hi folks,

The above says it all. JRC claim they didn't make it although I have a
tube and a socket from different sources and they are both clearly
labelled JRC.

It looks like a 500W plate dissipation tetrode. all the connections are
concentric so it may go to a respectable frequency. The socket doesn't
look as though it is suited for VHF or above though.

All assistance greatly appreciated.

Best regards to all

Mark G Robinson | ZL2TOD@ZL1AB | [phone]
[e-mail] | Box 8770, Auckland 1035, New Zealand



From [e-mail] Thu Sep 19 18:13:31 1996
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From: "Paul Christenson [N3EOP]" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: Key Input Specs?
Date: Sun, 15 Sep 1996 12:20:43 -0700
Organization: Cyclades Corporation
Lines: 17
Message-ID: <[e-mail]>
References: <01bb9e8e$8ea8ea80$[e-mail]>
NNTP-Posting-Host: easyfm.mediacity.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0Gold (X11; I; Linux 2.0.6 i586)
To: Rick Miller <[e-mail]>
Xref: news2.epix.net rec.radio.amateur.homebrew:16727 rec.radio.amateur.misc:106690

Rick Miller wrote:

> Can someone tell me what open-circuit voltage and closed-circuit
> current the device attatched to the "key" input of a rig is supposed
> to be able to handle?  If 5 Volts and 25 mA is sufficient, I'll be a
> happy camper!

That depends on the rig.  There are no standards; not even polarity.
I've had tube rigs that had nearly a hundred volts across the key
contacts.  An HT may have only one or two volts at a couple mA.

--
         +---------------------------------------------------+         .
         | Technical Support Engineer, Cyclades Corporation  |
         | 800/88-CYCLADES (882-9252) or [phone], x258 |
         | Maker of High Performance Multiport Serial Cards  |
         +---------------------------------------------------+


From [e-mail] Thu Sep 19 18:13:34 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!demos!news1.relcom.ru!EU.net!usenet2.news.uk.psi.net!uknet!usenet1.news.uk.psi.net!uknet!psinntp!psinntp!psinntp!main03!landisj
From: [e-mail] (Joe Landis)
Newsgroups: rec.radio.swap,rec.radio.amateur.misc,rec.radio.amateur.homebrew
Subject: Mid Atlantic VHF conference/Packrats Hamfest
Message-ID: <1996Sep12.140357.634@main03>
Date: 12 Sep 96 14:03:57 EST
Distribution: phl,pa,nj,del,md,dc,world
Organization: North American Drager - Telford, PA
Lines: 31
Xref: news2.epix.net rec.radio.swap:72641 rec.radio.amateur.misc:106640 rec.radio.amateur.homebrew:16708


                      *** Mid Atlantic VHF Conference ***

The 20th Annual Mid-Atlantic States VHF Conference sponsored by the Mt. Airy
VHF Radio Club will be held on Saturday, 5 October at the Days Inn in Horsham
PA. Technical presentations relating to VHF/UHF/SHF weak signal operating
will begin at 9AM.

The Days Inn is located just north of exit 27 (Willow Grove exit) of the PA
Turnpike, just north of Philadelphia, in Horsham, PA. Rooms at the Days Inn
can be reserved by calling 215-674-2500. Mention Pack Rats for a discount.
The Days Inn is filling up quickly, so reserve soon. Additional lodging is
available in the Horsham area.


                               *** HAMARAMA ***

On the following day, Sunday 6 Oct. the Packrats will have their annual hamfes
t
at the Bucks County Drive In Theater, about 5 miles north of PA Tpk. exit 27
on Rte. 611. Talk-in on 146.52 simplex and the W3CCX repeater on 224.58.

Ron, WZ1V has placed the flyer for the events, including a preliminary list of
presentations, on the N.E.W.S. Group web page:
            http://uhavax.hartford.edu/~newsvhf/hamarama.html

For  more information on the technical conference or a possible presentation
slot,  contact John Sortor, KB3XG, at 610-584-2489 or at [e-mail].

Joe - AA3GN
--
[e-mail] - speaking


From [e-mail] Thu Sep 19 18:13:35 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!cs.utexas.edu!swrinde.nde.swri.edu!news.sgi.com!nntp-hub2.barrnet.net!cpk-news-feed2.bbnplanet.com!cpk-news-hub1.bbnplanet.com!newsfeed.internetmci.com!netnews.nwnet.net!news-hub.interserv.net!news.interserv.com!news
From: [e-mail]    Ray Smith-KE4OGG
Newsgroups: rec.radio.amateur.homebrew
Subject: MITREK conversion to 10 meters
Date: 19 Sep 1996 18:58:10 GMT
Organization: InterServ News Service
Lines: 6
Message-ID: <51s542$[e-mail]>
NNTP-Posting-Host: 148.134.184.74
X-Newsreader: AIR News 3.X (SPRY, Inc.)

Has anyone converted a motorola mitrek radio to 10 meters?  I have 3 basically
 new  radios set up
for ~33MHZ operation and was wondering if anyone had info or could point me to
ward info on
converting these radios. Thanks in advance!
Ray, KE4 OGG
Seneca SC



From [e-mail] Thu Sep 19 18:13:36 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-atl-21.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!newsfeed.internetmci.com!in3.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: More tubes & more transformers & more snide social commentary
Date: 13 Sep 1996 14:55:30 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 28
Sender: [e-mail]
Message-ID: <51b2k5$[e-mail]>
References: <519qt7$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <519qt7$[e-mail]>, [e-mail]
(TIEMANN BRUCE) writes:

>
>Hey! I didn't pay a cent for this thing! It may not be a Peter Dahl
>Hypersil« Megabuck thing, but it was free!  If it manages to run a HeNe
or
>a PMT (which it will) it's already pure bonus.  But probably a few more
>watts can be coaxed out of it than that.
>
>Not bad for a banged-up microwave by the side of the road, and half an
>hour with a screwdriver.
>
>Bruce

I'm sorry, I thought it was for a SSB or CW PA. For your application it's
a good deal.

What I was trying to say is voltage sag under load will be much more
likely to limit the power than heating even if the magnetic shunts are
knocked out, since the flux path, coupling, and wire guage are all
selected for a different application.

Voltage stability with load changes are only a factor on CW or SSB, where
the voltage sag causes envelope distortion. So please excuse my snide
social commentary.

73 Tom


From [e-mail] Thu Sep 19 18:13:37 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-atl-21.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!newsfeed.internetmci.com!in3.uu.net!ott.istar!istar.net!n3ott.istar!ban.libertel.montreal.qc.ca!ban.libertel.montreal.qc.ca!blackm00
From: Michael Black <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: More tubes & more transformers & more snide social commentary
Date: Wed, 18 Sep 1996 22:27:24 -0400
Organization: Libertel de Montreal/Montreal Libertel
Lines: 31
Message-ID: <[e-mail]>
References: <[e-mail]> <518bd1$[e-mail]> <519qt7$[e-mail]> <51pd6m$[e-mail]>
NNTP-Posting-Host: ban.libertel.montreal.qc.ca
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
In-Reply-To: <51pd6m$[e-mail]>

On 18 Sep 1996, Filip M Gieszczykiewicz wrote:

^
> Greetings. I have a vague memory of uWave Xformers being butchered
> into a 120V:120V isolation Xformer... they cut two Xformers and
> welded the primaries...
>
> If you find a uWave and by chance want to use it to nuke your lunch
> but need to fix it first, see Sam G's excellent uWave repair
> guides (extensive) at URL:
>
> http://www.paranoia.com/~filipg/HTML/REPAIR/
>

Filip's web site is very well worth visiting.  If you read
sci.electronics.repair, even once, you're bound to see reference to
it and for good reason.  It is a source of truly useful information,
and the site is Lynx friendly too!  There is quite a bit about
repairing various devices, along with some more general electronic
information.  It's the sort of site that deserves to be linked too,
and if more people would look there first, we'd get fewer of those
commony asked questions.

By the way, I seem to recall the idea of back to back microwave
transformers as an isolation transformer was in Electronics Now
(formerly Radio Electronics).  I guess it gave some details to pad
out the article, but the basic idea is right there.  It was in recent
years, though I don't remember what issue.

    Michael  VE2BVW



From [e-mail] Thu Sep 19 18:13:38 1996
Path: news2.epix.net!news3.epix.net!uunet!in2.uu.net!news.sgi.com!csulb.edu!info.ucla.edu!nnrp.info.ucla.edu!psgrain!rainrgnews0!hevanet.com!usenet
From: "miker in Tigard, OR." <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Need Help with building a discone
Date: Sat, 14 Sep 1996 23:51:08 -0700
Organization: Hevanet Communications
Lines: 15
Message-ID: <[e-mail]>
NNTP-Posting-Host: ke-ppp21.hevanet.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.02 (Win95; I)

I want to build a discone for my frg9600.  I thought i'd make
it out of .2" dia aluminum rod that's in the junk box.

The disk and the cone designs are easily determined from
engineering handbooks.  But they don't say much about what goes on
at the apex of the cone.  Sounds like the cone should go to a point
if possible.  But you have to stick a support pipe up the middle.

Anyone got ideas on how to configure the mechanical parts and
electrical connection where
the cone joins the disk?  I'd like it to be strong enough to withstand
at least the first windstorm.

Oh, cheap materials is better...
thanks, miker


From [e-mail] Thu Sep 19 18:13:39 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-atl-21.sprintlink.net!news.sprintlink.net!news-fw-6.sprintlink.net!nntp.primenet.com!cs.utexas.edu!news.cs.utah.edu!cc.usu.edu!slnfn
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Need info on FM antena
Message-ID: <[e-mail]>
Date: 15 Sep 96 22:36:30 MDT
Organization: Utah State University
Lines: 12

Hi all.

     I don't usually follow this group, but am in need of some quick
information.  I have a stereo reciever that is badly in need of an FM antena.
Being that I'm a poor college student, I don't have the money to run out and
get a good commercial one.  I hope that mabye someone out there will take pity
on me and tell me an easy way to build a makeshift antena that will give me
pretty good reception until I can get a good one?

Thanks for your help, in advance.




From [e-mail] Thu Sep 19 18:13:40 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!news.sprintlink.net!news-peer.sprintlink.net!cs.utexas.edu!usc!newshub.cts.com!news7.crl.com!nntp.crl.com!usenet
From: Dave Booth <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.packet
Subject: Re: New Web Site
Date: Tue, 17 Sep 1996 15:04:35 -0700
Organization: KC6WFS
Lines: 34
Message-ID: <[e-mail]>
References: <51kr4q$[e-mail]>
NNTP-Posting-Host: 165.113.223.131
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 3.0 (X11; U; IRIX 5.3 IP19)

I'll have to check it out.
Dave Booth kc6wfs dm40rk
http://www.geocities.com/Hollywood/5860


Bry wrote:

>
> Hi - visit my new Web Page at
> http://www.mnsinc.com/bry/
>
> Featuring:
> MEGALIST + HAM RADIO + HOCKEY = Bry's Page!
>
> LOTS of useful information about USA & UK sources of amateur radio & shortwa
ve
> radio equipment, parts, kits, manuals, xtals, valves/tubes, repairs,
> modifications etc., and TONS of radio links to SHortwave sites, ham radio
> sites, Christian & Messianic Jewish sites, and a whole load of really good I
CE
> HOCKEY and ROLLER HOCKEY sites. MANY HOT LINKS!
>
> UK to USA English Dictionary. Information about POW-WOW and getting subscrib
ed
> to the yoth-hockey mailing list, FREE E-MAIL services etc. etc. Something fo
r
> everyone here!
>
> Give it a try - you'll be glad you did!
>
> Bry
>
> Brian Carling, AF4K / G3XLQ
> [e-mail]
> http://www.mnsinc.com/bry = MEGALIST + HOCKEY + HAM RADIO = Bry's Page!

--
Dave Booth


From [e-mail] Thu Sep 19 18:13:41 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!news.sgi.com!news.msfc.nasa.gov!newsfeed.internetmci.com!malgudi.oar.net!hyperion.wright.edu!news.wright.edu!nova.wright.edu!nyoung
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Schemo wanted for R-174... still yet already even...
Date: 14 Sep 96 09:21:18 EST
Organization: Wright State University
Lines: 16
Message-ID: <[e-mail]>
NNTP-Posting-Host: nova.wright.edu

Still looking for a copy of the schemo for a R-174
military surplus receiver, circa 1950, manufactured
by Emerson Radio. I will gladly pay postage and copying
fees. If I can't come up with one here, my only hope is
to somehow make a copy of the one what's pasted to the
underside of the radio in question. That ain't a pretty
prospect, since these damn copy machines have a very
short focal length... like measured in Angstroms of
something.

73
Nils
WB8IJN &c
And no, I can't download picture files from web sites.
Whaddya think this is? The 21st Century?



From [e-mail] Thu Sep 19 18:13:42 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-atl-21.sprintlink.net!news.voicenet.com!netaxs.com!tezcat!cam-news-hub1.bbnplanet.com!www.nntp.primenet.com!nntp.primenet.com!netcom.com!dgf
From: [e-mail] (David Feldman)
Subject: Re: Strange balanced modulator design question
Message-ID: <[e-mail]>
Organization: Organization? Me?
References: <[e-mail]> <51hjnt$[e-mail]> <[e-mail]>
Date: Mon, 16 Sep 1996 14:14:55 GMT
Lines: 23
Sender: [e-mail]

In article <[e-mail]> Jake Brodsky <[e-mail]> writes:
>I'm just speculating as to what that modulator circuit might be like...
>
>If complexity and expense were no object, why not run the audio through
>an audio band pass filter and then through an A/D sampler (aka mixer)
>to put the signal at 4000 to 7100 Hz, or something like that.  Then,
>using more filtering (switched capacitor?) and the phasing method of
>SSB, one could make a nice, low distortion signal.  Could this be what
>those clever Japanese were doing?


I suspect it's some of this... The radio is a 144 MHz SSB HT, and based
on my friend's evaluation in Japan, he reported that the transmitted audio
quality was considered unusually good (describing it as a "human voice",
as opposed to a "robot voice" which afflicts most SSB transmissions). I
suspect the primary goal was to improve opposite sideband supression, however,
it also might have the effect of reducing group delay distortion through
the SSB filter (a simple 4-pole job). In any event, the interesting thing
is that the audio processing is done with a single chip and just a few externa
l
components.

73 Dave WB0GAZ [e-mail]



From [e-mail] Thu Sep 19 18:13:44 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!newsfeed.internetmci.com!swrinde.nde.swri.edu!cs.utexas.edu!math.ohio-state.edu!jussieu.fr!univ-lyon1.fr!in2p3.fr!swidir.switch.ch!surfnet.nl!sun4nl!rnzll3!sys3.pe1chl!rob
From: [e-mail] (Rob Janssen)
Subject: Re: Strange balanced modulator design question
X-Newsreader: NN version 6.5.0 (NOV)
Reply-To: [e-mail]
Organization: PE1CHL
Message-ID: <[e-mail]>
References: <[e-mail]> <51hjnt$[e-mail]> <[e-mail]> <[e-mail]>
Date: Tue, 17 Sep 1996 16:49:10 GMT
Lines: 29

In <[e-mail]> [e-mail] (David Feldman) writes:


>I suspect it's some of this... The radio is a 144 MHz SSB HT, and based
>on my friend's evaluation in Japan, he reported that the transmitted audio
>quality was considered unusually good (describing it as a "human voice",
>as opposed to a "robot voice" which afflicts most SSB transmissions). I
>suspect the primary goal was to improve opposite sideband supression, however
,
>it also might have the effect of reducing group delay distortion through
>the SSB filter (a simple 4-pole job). In any event, the interesting thing
>is that the audio processing is done with a single chip and just a few extern
al
>components.

This single chip was probably designed for use as a simple "scrambler"
in cordless telephones.  When tuning over those bands you sometimes hear
intelligible speech which clearly has been spectrum-inverted.
These telephones are probably made in sufficient quantity to design
a special-purpose chip, and it is useful for the SSB transmitter purpose
as well.

About the HT: does this mean we can expect a new SSB HT from one of the
wellknown manufacturers soon?  Or is this an old thing.  I remember
seeing a 2m SSB HT in Japan long ago, but it never appeared here.

Rob
--
+------------------------------------+--------------------------------------+
| Rob Janssen       [e-mail] | WWW: http://www.knoware.nl/users/rob |
| AMPRnet:       [e-mail] | AX.25 BBS: PE1CHL@PI8WNO.#UTR.NLD.EU |
+------------------------------------+--------------------------------------+


From [e-mail] Thu Sep 19 18:13:46 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!newsfeed.internetmci.com!hsnx.wco.com!waldorf.csc.calpoly.edu!isnews.csc.calpoly.edu!hertz.elee.calpoly.edu!ceustaqu
From: Cal Eustaquio <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Sync AM chip source
Date: Tue, 17 Sep 1996 15:31:22 -0700
Organization: Cal Poly, San Luis Obispo
Lines: 2
Message-ID: <[e-mail]>
NNTP-Posting-Host: hertz.elee.calpoly.edu
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII

Does anyone know a parts/chip source for a sync AM detector? I am trying
to build one but I don't have any leads. Cal.


From [e-mail] Thu Sep 19 18:13:47 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!www.nntp.primenet.com!nntp.primenet.com!news.sprintlink.net!news-stk-3.sprintlink.net!news.sprintlink.net!news-ana-24.sprintlink.net!news.voicenet.com!usenet
From: [e-mail] (James R. Mooney)
Newsgroups: rec.radio.amateur.homebrew
Subject: Transverter Plans
Date: Sun, 15 Sep 1996 21:23:34 GMT
Organization: Voicenet - Internet Access - [phone]
Lines: 11
Message-ID: <51hs8v$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ivyland468.voicenet.com
X-Newsreader: Forte Free Agent 1.0.82

Does anyone have any or know where I can get schematics for building
transverters for 6m, 2m, and 440 for use with an HF rig (Kenwood
TS-511s).  Any help in this area would be greatly appreciated.  If
anyone has plans I am willing to pay for photocopies and postage!

Please contact me via e-mail at: [e-mail]


                        73's
                        Jim N3SIR



From [e-mail] Thu Sep 19 18:13:48 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-atl-21.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!arclight.uoregon.edu!chi-news.cic.net!news.cic.net!branch.com!usenet
From: [e-mail] (Ryan)
Newsgroups: rec.radio.amateur.homebrew
Subject: Use for broken transformers ?
Date: Sat, 14 Sep 1996 23:48:49 GMT
Organization: Various Organizations
Lines: 6
Message-ID: <51f9go$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: 206.28.165.154
X-Newsreader: Forte Free Agent 1.0.82

Is there any practical use for a transformer that has one winding
burned out? I was really wondering if it would work for an RF choke
in the hot lead to a mobile radio. thanks for any info.

Ryan



From [e-mail] Thu Sep 19 18:13:50 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!hunter.premier.net!news1.erols.com!news.bconnex.net!news.ac.net!pacifier!ip137.pdx1.pacifier.com!user
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Use for open-filament 8877?
Date: Thu, 19 Sep 1996 02:34:02 -0700
Organization: Pacifier BBS, Vancouver, Wa.  ([phone])
Lines: 13
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ip137.pdx1.pacifier.com

In article <[e-mail]>, [e-mail] (David Feldman) wrote:

> An amplifier recently purchased arrived with an open filament 8877. Whether
> caused by mishap in transit or other means will probably be a mystery, but
> I'm now wondering what use (if any) can be made of such a tube? Any ideas?
>
> 73 Dave WB0GAZ [e-mail]

Have never seen it advertised, but these tubes could probably be recycled
if there was the $$ motivation.  Call up Svetlana.  They might have much
higher motivation for recycling.  Doesn't seem like there is much interest
left in US in tube manufacture now that Russians and Chinese are getting
way up on the learning curve.


From [e-mail] Thu Sep 19 18:13:50 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!fozzie.mercury.net!zombie.ncsc.mil!newsgate.duke.edu!agate!spool.mu.edu!newspump.sol.net!www.nntp.primenet.com!nntp.primenet.com!swrinde.nde.swri.edu!newsfeed.internetmci.com!news.bctel.net!news.mag-net.com!ve7tcp.ampr.org!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Bruce E. Chadwick)
Newsgroups: rec.radio.amateur.homebrew
Subject: Video Modulation
Date: 17 Sep 96 13:33:43 GMT
Organization: ucsd usenet gateway
Lines: 7
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

I was told that I can use one of my old UHF rigs to
do ATV.  Does anyone have the scehmatic for the modulation
component that I would need to add to get my voice and video
on the signal?

Bruce, KB7CFL
[e-mail]


From [e-mail] Thu Sep 19 18:13:51 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-atl-21.sprintlink.net!newsfeed1.aimnet.com!www.nntp.primenet.com!nntp.primenet.com!swrinde.nde.swri.edu!news-peer.gsl.net!news.gsl.net!ix.netcom.com!news
From: KD1YV <[e-mail]>
Newsgroups: rec.radio.amateur.misc,rec.radio.swap,rec.radio.amateur.antenna,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc,rec.radio.amateur.space
Subject: Western Connecticut Hamfest this Sunday!
Date: Sat, 14 Sep 1996 00:22:04 -0300
Organization: Hamily !
Lines: 25
Message-ID: <[e-mail]>
NNTP-Posting-Host: dby-ct1-05.ix.netcom.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-NETCOM-Date: Fri Sep 13  9:24:30 PM PDT 1996
X-Mailer: Mozilla 2.02 (Win16; I)
Xref: news2.epix.net rec.radio.amateur.misc:106668 rec.radio.swap:72698 rec.radio.amateur.antenna:24184 rec.radio.amateur.homebrew:16717 rec.radio.amateur.digital.misc:16954 rec.radio.amateur.space:7490

THE WESTERN CONNECTICUT HAMFEST
Sponsored by the Candlewood Amateur Radio Association

Just 14 miles from the NY/CT State line!

Sunday, Sept. 15, 1996                      0900-1400
Edmond Town Hall                 Route 6, Newtown, CT
Tables inside                      Tailgating outside
ARRL Sanctioned                    Handicapped Access
Door Prizes                             Ample Parking
Gourmet Fare                            Rain or shine

Talk-in 147.12/.72 PL 141.3

General admission $4.00 at the door (what a deal!)

Tailgating $6.00, inside table reservations $10.00 each, (both
include 1 admission), mail to:
Candlewood Amateur Radio Association, PO BOX 3441, Danbury CT 06813

For more info, phone [phone] or [phone].

Hope to see you all there.
73 de KD1YV
Jim


From [e-mail] Thu Sep 19 18:13:52 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!cs.utexas.edu!howland.erols.net!netcom.com!dgf
From: [e-mail] (David Feldman)
Subject: Re: what is the "call" channel?
Message-ID: <[e-mail]>
Organization: Organization? Me?
References: <51pmi5$[e-mail]>
Date: Wed, 18 Sep 1996 20:54:36 GMT
Lines: 15
Sender: [e-mail]

In article <51pmi5$[e-mail]> [e-mail] (Danny) writes:
>At the risk of looking stupid I must ask this question.  I have a
>Kenwood 732 transceiver and it refers to the call channel in the
>instruction booklet but for the life of me I don't know what that
>means.  could someone out there tell me

It's usually a programmed frequency, often that can be scanned "in the
background" while listening elsewhere (i.e., the radio occasionally
polls the "call channel" a few times per second looking for activity).

In Japan where all operations are 144-146 MHz simplex, the call channel
seems to be by default 145.000 MHz.

73 Dave WB0GAZ [e-mail]



From [e-mail] Thu Sep 19 18:13:53 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-dc-10.sprintlink.net!nntp.primenet.com!news.cais.net!Grouper.Exis.Net!usenet
From: [e-mail] (Danny)
Newsgroups: rec.radio.amateur.homebrew
Subject: what is the "call" channel?
Date: Wed, 18 Sep 1996 20:36:34 GMT
Organization: Exchange Information Systems Networks
Lines: 10
Message-ID: <51pmi5$[e-mail]>
NNTP-Posting-Host: ppp-2-43.exis.net
X-Newsreader: Forte Free Agent v0.55

At the risk of looking stupid I must ask this question.  I have a
Kenwood 732 transceiver and it refers to the call channel in the
instruction booklet but for the life of me I don't know what that
means.  could someone out there tell me


Thanks

Danny



From [e-mail] Thu Sep 19 18:13:54 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-atl-21.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!cs.utexas.edu!howland.erols.net!newsfeed.internetmci.com!news.sprintlink.net!news-stk-200.sprintlink.net!news.callamer.com!spork.callamer.com!cbuttsch
From: Clifford Buttschardt <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WTB: 6" Ceramic Spreaders for Open Wire Line
Date: Fri, 13 Sep 1996 17:39:26 -0700
Organization: Call America Internet Services  [phone]
Lines: 24
Message-ID: <[e-mail]>
References: <519hpi$[e-mail]>
NNTP-Posting-Host: spork.callamer.com
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Sender: [e-mail]
To: Gordon Symonds <[e-mail]>
In-Reply-To: <519hpi$[e-mail]>

You might as well forget obtaining ceramic spacers but if you do,
congratulations!  A modern approach is to obtain some of the high pressure
air hose material used in garages and machine shops.  This material
usually yellow and coiled in loops.  Cut this material in six  + inch
lengths, drill a hole suitable for #12 wire and cut two slits from the end
of the "spreader" into the drilled hole.  Works better, lasts longer and
is cheaper especially along the saltwater coasts!  Cliff Buttschardt K7RR



On 12 Sep 1996, Gordon Symonds wrote:

>
> I need enough spreaders for a 1/4 wave open wire line at 80m.  6"
> spacing preferred, as that will give 600 ohm surge impedance with
> 12 ga wire.
>
> I have had varying opinions about how many I need, probably at least
> 30 for the 60+ ft feeder.
>
> This is for a 1927 transmitter project, thanks for any help.
>
>



From [e-mail] Thu Sep 19 18:13:56 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!tezcat!cam-news-hub1.bbnplanet.com!cpk-news-feed2.bbnplanet.com!cpk-news-hub1.bbnplanet.com!newsfeed.internetmci.com!forge.sbt.net!news.ia.net!usenet
From: [e-mail] ()
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WTB: 6" Ceramic Spreaders for Open Wire Line
Date: Sat, 14 Sep 1996 17:26:29 GMT
Organization: InterAccess Networking
Lines: 42
Message-ID: <51eps8$[e-mail]>
References: <519hpi$[e-mail]> <[e-mail]>
NNTP-Posting-Host: cr-port05.ia.net
X-Newsreader: Forte Free Agent v0.46

Clifford Buttschardt <[e-mail]> wrote:

>You might as well forget obtaining ceramic spacers but if you do,
>congratulations!  A modern approach is to obtain some of the high pressure
>air hose material used in garages and machine shops.  This material
>usually yellow and coiled in loops.  Cut this material in six  + inch
>lengths, drill a hole suitable for #12 wire and cut two slits from the end
>of the "spreader" into the drilled hole.  Works better, lasts longer and
>is cheaper especially along the saltwater coasts!  Cliff Buttschardt K7RR



>On 12 Sep 1996, Gordon Symonds wrote:

>>
>> I need enough spreaders for a 1/4 wave open wire line at 80m.  6"
>> spacing preferred, as that will give 600 ohm surge impedance with
>> 12 ga wire.
>>
>> I have had varying opinions about how many I need, probably at least
>> 30 for the 60+ ft feeder.
>>
>> This is for a 1927 transmitter project, thanks for any help.
>>
>>
I was looking for ceramic spreaders about 25 years ago.  At that time
a wrote a note in my antenna book.  This information is 25 years old,
but who knows...

6-inch spreaders
Herman Schmidt #9626
$60.00 per 100
Dealer:  Lowell Kangas,  St. Louis
                [phone]

If you are really lucky, maybe this will help.

73,  John Ely   W0GN






From [e-mail] Thu Sep 19 18:13:57 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-peer.sprintlink.net!cs.utexas.edu!swrinde.nde.swri.edu!newsfeed.internetmci.com!metro.atlanta.com!news.radio.org!ka4ybr.netmha.com!not-for-mail
From: [e-mail] (Bob Duckworth)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: WTB: 6" Ceramic Spreaders for Open Wire Line
Date: 16 Sep 1996 14:19:23 -0400
Organization: Mark Horton Associates
Lines: 22
Message-ID: <51k5nb$[e-mail]>
References: <519hpi$[e-mail]> <[e-mail]>
NNTP-Posting-Host: ka4ybr.netmha.com

In article <[e-mail]>, Robert Morris  <[e-mail]> wrote:
>Gordon Symonds wrote:
>>
>> I need enough spreaders for a 1/4 wave open wire line at 80m.  6"
>> spacing preferred, as that will give 600 ohm surge impedance with
>> 12 ga wire.
>
>Farm supply stores....3 foot lengths of fiberglass rod.. 3/8" dia.

Bamboo chopsticks.Cut, drill, dip in spar varnish.
Most any asian food store.
Clamp bundle in drill press vise befor you unwrap it
and drill a bunch at once.

-bob
WB4MNF

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


From [e-mail] Thu Sep 19 18:13:59 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.cdsnet.net!news.magicnet.net!news.iag.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!newsfeed.internetmci.com!news.preferred.com!usenet
From: "James R. Chastain" <[e-mail]>
Newsgroups: alt.ham-radio.atv,alt.ham-radio.eme,alt.ham-radio.exotic-modes,alt.ham-radio.fm,rec.radio.amateur,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.space,rec.radio.swap,sci.electronics.misc,tnn.radi
Subject: WTB: Schematic for Microwave Modules MMT 144/28 transverter.
Date: 13 Sep 1996 18:29:11 GMT
Organization: Preferred Internet News Server
Lines: 9
Message-ID: <01bba1a7$6301e6e0$[e-mail]>
NNTP-Posting-Host: 207.159.71.194
X-Newsreader: Microsoft Internet News 4.70.1155
Xref: news2.epix.net rec.radio.amateur.equipment:32330 rec.radio.amateur.homebrew:16712 rec.radio.amateur.misc:106660 rec.radio.amateur.space:7487 rec.radio.swap:72677 sci.electronics.misc:8924

Hi,
        I am looking for a schematic/service manual for a Microwave
        modules MMT 144/28 transverter. I recently had to sell my
        primary VHF/UHF allmode and need to repair the xverter
        to get back on. I would be happy to pay for reproduction
        and shipping costs. Please E-mail [e-mail]

                                        Thanks, Rod. (KD0XX)



From [e-mail] Fri Sep 27 21:56:27 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsfeed.telalink.net!telalink!news.wildstar.net!news.ecn.uoknor.edu!munnari.OZ.AU!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Bud Simciak)
Newsgroups: rec.radio.amateur.homebrew
Subject: (none)
Date: 23 Sep 96 14:41:18 GMT
Organization: Hand Held Products, Inc.
Lines: 40
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]


Text item: Text_1

     Robert Smits (VE7HS) wrote:

     >Well, they basically priced themselves out of the market. Why would
     >you spend a lot of time building equipment that wasn't as good as
     >stuff you could buy off the shelf for less?

     Heath had an initial advantage when the first started in that the
     wiring in electonics was point to point and very time consuming.  When
     PCBs were used and the boards were stuffed and wave soldered by
     machine that advantage went away.  Within Heath, the development for a
     kit had to be paid off in two years of production.  This was the
     standard and that set the kit price (we had an old PDP-8 that was
     pre-programmed with the accepted formula to generate the kit price).
     The problem was the volume.  The volumes were in many cases for Ham
     equipment a few thousand a year.  Also throw into the barrel that
     their was not a lot of money for test equipment.  But.... it was a
     great place to work and had wonderful people.

     >The reason kits were made in the first place was because hams liked
     >building them, and minus the labour of assembly, they could be sold
     >cheaper than ready built items. (And hams were always...errr frugal)

     Again, not when you are dealing with low volumes.  Heath did not
     export well.  Many of the decision makers dealt with Illinois,
     Indiana, Michigan, and Wisconson as their primary sales area.  I
     recall this in particular when they began talking about a major sales
     campaign to push the H-8 computer.  The national blitz was four
     states.

     >By the 1970's there was no longer any financial advantage in kits.

     Heath finally began trying to sell the experience i.e. the pleasure of
     building your own equipment for six hours is cheaper than a Rock
     Concert (or whatever).

     Bud Simciak
     W4HXP


From [e-mail] Fri Sep 27 21:56:29 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!cam-news-hub1.bbnplanet.com!cpk-news-hub1.bbnplanet.com!newsfeed.internetmci.com!in3.uu.net!nntp.teleport.com!usenet
From: [e-mail] (Jim McVein)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.shortwave
Subject: Re: Active Antenna Designs
Date: Fri, 20 Sep 1996 18:01:42 GMT
Organization: Teleport - Portland's Public Access [phone]
Lines: 20
Message-ID: <51um6u$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: ip-vanc2-09.teleport.com
X-Newsreader: Forte Free Agent 1.0.82
Xref: news2.epix.net rec.radio.amateur.homebrew:16765 rec.radio.shortwave:78631

[e-mail] (bjrehm) wrote:

>I am looking for design ideas, schematics, suggested sources, and
>performance reports for active antenna designs.  I would like to
>build my own for home and mobile SWL use.

>Thanks,

>Brian

A good article appeared in Ham Radio Magazine, May 1986 on
active antenna preamps using VMOS FET's. I built some when
i was in an urban apartment situation and they worked exceedingly
well.  Article author is R.W. Burhans, who seems to be an authority
on active antenna design, I have seen other articles by the author
in other more academic texts.

Jim McVein
[e-mail]



From [e-mail] Fri Sep 27 21:56:30 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!news.sgi.com!news.msfc.nasa.gov!newsfeed.internetmci.com!news.ac.net!news.bconnex.net!clicnet!news.clic.net!rcogate.rco.qc.ca!news.total.net!news
From: [e-mail] (H. Caron)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.shortwave
Subject: Re: Active Antenna Designs
Date: Sat, 21 Sep 1996 02:30:55 GMT
Organization: Infobahn Online Services, Montreal, CANADA [phone]
Lines: 30
Message-ID: <5205pk$[e-mail]>
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[e-mail] (Jim McVein) wrote:

>[e-mail] (bjrehm) wrote:

>>I am looking for design ideas, schematics, suggested sources, and
>>performance reports for active antenna designs.  I would like to
>>build my own for home and mobile SWL use.

>>Thanks,

>>Brian

>A good article appeared in Ham Radio Magazine, May 1986 on
>active antenna preamps using VMOS FET's. I built some when
>i was in an urban apartment situation and they worked exceedingly
>well.  Article author is R.W. Burhans, who seems to be an authority
>on active antenna design, I have seen other articles by the author
>in other more academic texts.

>Jim McVein
>[e-mail]

Brian,

Take a look at Radio Graffity's site  http://espresso.ts.uvic.ca/
under the antenna heading. Easy to find and inexpensive parts.

Hope it helps,
H.C.



From [e-mail] Fri Sep 27 21:56:31 1996
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From: [e-mail] (H. Caron)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.shortwave
Subject: Re: Active Antenna Designs
Date: Sat, 21 Sep 1996 02:38:52 GMT
Organization: Infobahn Online Services, Montreal, CANADA [phone]
Lines: 30
Message-ID: <520684$[e-mail]>
References: <[e-mail]> <51um6u$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: 205.236.175.178
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[e-mail] (Jim McVein) wrote:

>[e-mail] (bjrehm) wrote:

>>I am looking for design ideas, schematics, suggested sources, and
>>performance reports for active antenna designs.  I would like to
>>build my own for home and mobile SWL use.

>>Thanks,

>>Brian

>A good article appeared in Ham Radio Magazine, May 1986 on
>active antenna preamps using VMOS FET's. I built some when
>i was in an urban apartment situation and they worked exceedingly
>well.  Article author is R.W. Burhans, who seems to be an authority
>on active antenna design, I have seen other articles by the author
>in other more academic texts.

>Jim McVein
>[e-mail]

Brian,

Take a look at Radio Graffity's site  http://espresso.ts.uvic.ca/
under the antenna heading. Easy to find and inexpensive parts.

Hope it helps,
H.C.



From [e-mail] Fri Sep 27 21:56:32 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!enews.sgi.com!news.sgi.com!news.msfc.nasa.gov!newsfeed.internetmci.com!news.ac.net!news.bconnex.net!clicnet!news.clic.net!rcogate.rco.qc.ca!news.total.net!news
From: [e-mail] (H. Caron)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.shortwave
Subject: Re: Active Antenna Designs
Date: Sat, 21 Sep 1996 02:36:11 GMT
Organization: Infobahn Online Services, Montreal, CANADA [phone]
Lines: 30
Message-ID: <520628$[e-mail]>
References: <[e-mail]> <51um6u$[e-mail]>
Reply-To: [e-mail]
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X-Newsreader: Forte Free Agent 1.0.82
Xref: news2.epix.net rec.radio.amateur.homebrew:16770 rec.radio.shortwave:78644

[e-mail] (Jim McVein) wrote:

>[e-mail] (bjrehm) wrote:

>>I am looking for design ideas, schematics, suggested sources, and
>>performance reports for active antenna designs.  I would like to
>>build my own for home and mobile SWL use.

>>Thanks,

>>Brian

>A good article appeared in Ham Radio Magazine, May 1986 on
>active antenna preamps using VMOS FET's. I built some when
>i was in an urban apartment situation and they worked exceedingly
>well.  Article author is R.W. Burhans, who seems to be an authority
>on active antenna design, I have seen other articles by the author
>in other more academic texts.

>Jim McVein
>[e-mail]

Brian,

Take a look at Radio Graffity's site  http://espresso.ts.uvic.ca/
under the antenna heading. Easy to find and inexpensive parts.

Hope it helps,
H.C.



From [e-mail] Fri Sep 27 21:56:33 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news-stock.gsl.net!news.gsl.net!news-penn.gsl.net!news.gsl.net!snunews.snu.ac.kr!usenet.kornet.nm.kr!agate!spool.mu.edu!newspump.sol.net!www.nntp.primenet.com!nntp.primenet.com!hunter.premier.net!news.cais.net!van-bc!news.rmii.com!newsjunkie.ans.net!newsfeeds.ans.net!rcogate.rco.qc.ca!news.total.net!news
From: [e-mail] (H. Caron)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.shortwave
Subject: Re: Active Antenna Designs
Date: Sat, 21 Sep 1996 02:34:19 GMT
Organization: Infobahn Online Services, Montreal, CANADA [phone]
Lines: 30
Message-ID: <52060m$[e-mail]>
References: <[e-mail]> <51um6u$[e-mail]>
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Xref: news2.epix.net rec.radio.amateur.homebrew:16779 rec.radio.shortwave:78666

[e-mail] (Jim McVein) wrote:

>[e-mail] (bjrehm) wrote:

>>I am looking for design ideas, schematics, suggested sources, and
>>performance reports for active antenna designs.  I would like to
>>build my own for home and mobile SWL use.

>>Thanks,

>>Brian

>A good article appeared in Ham Radio Magazine, May 1986 on
>active antenna preamps using VMOS FET's. I built some when
>i was in an urban apartment situation and they worked exceedingly
>well.  Article author is R.W. Burhans, who seems to be an authority
>on active antenna design, I have seen other articles by the author
>in other more academic texts.

>Jim McVein
>[e-mail]

Brian,

Take a look at Radio Graffity's site  http://espresso.ts.uvic.ca/
under the antenna heading. Easy to find and inexpensive parts.

Hope it helps,
H.C.



From [e-mail] Fri Sep 27 21:56:34 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!hunter.premier.net!netnews.worldnet.att.net!news.alt.net!newspost1.alt.net!usenet
From: Roy Keeley <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew,rec.radio.shortwave
Subject: Re: Active Antenna Designs
Date: Wed, 25 Sep 1996 11:52:34 -0500
Organization: Railway Express, Inc.
Lines: 51
Message-ID: <[e-mail]>
References: <[e-mail]> <51um6u$[e-mail]> <[e-mail]>
Mime-Version: 1.0
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bjrehm wrote:
>
> In article <51um6u$[e-mail]>, [e-mail]
> says...
> >
> >[e-mail] (bjrehm) wrote:
> >
> >>I am looking for design ideas, schematics, suggested sources,
> and
> >>performance reports for active antenna designs.  I would like
> to
> >>build my own for home and mobile SWL use.
> >
> >>Thanks,
> >
> >>Brian
> >
> >A good article appeared in Ham Radio Magazine, May 1986 on
> >active antenna preamps using VMOS FET's. I built some when
> >i was in an urban apartment situation and they worked
> exceedingly
> >well.  Article author is R.W. Burhans, who seems to be an
> authority
> >on active antenna design, I have seen other articles by the
> author
> >in other more academic texts.
> >
> >Jim McVein
> >[e-mail]
> >
> Thanks Jim, I have the article, but did not know that Burhans has
> published outside of the article.  Could you pass on the academic
> texts he has also written (the name sounds familiar, but I have
> not found were from yet).
>
> Brian
Mr. Burhans has retired. He wrote many articles for the "Lowdown" which
is the monthly paper put out by the Lowfering Group. He especialized in
preamp antennas designs. I can look up the address of Lowdown if there
is any interest. He also wrote many articles for the Ham Radio public,
but he has officially quit all business.

--
73's

Roy KC4IMC

[e-mail]
[e-mail]
[e-mail]
Snail Mail = 10675 Salt Aire Rd, E., Theodore, AL 36582, USA


From [e-mail] Fri Sep 27 21:56:35 1996
Newsgroups: rec.radio.amateur.homebrew,rec.radio.shortwave
Path: news2.epix.net!news3.epix.net!uunet!in1.uu.net!psinntp!psinntp!psinntp!ss3.fw.hac.com!usenet
From: [e-mail] (bjrehm)
Subject: Re: Active Antenna Designs
X-Nntp-Posting-Host: bjrehm
Message-ID: <[e-mail]>
Sender: [e-mail]
Organization: MESC
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References: <[e-mail]> <51um6u$[e-mail]>
Mime-Version: 1.0
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In article <51um6u$[e-mail]>, [e-mail]
says...
>
>[e-mail] (bjrehm) wrote:
>
>>I am looking for design ideas, schematics, suggested sources,
and
>>performance reports for active antenna designs.  I would like
to
>>build my own for home and mobile SWL use.
>
>>Thanks,
>
>>Brian
>
>A good article appeared in Ham Radio Magazine, May 1986 on
>active antenna preamps using VMOS FET's. I built some when
>i was in an urban apartment situation and they worked
exceedingly
>well.  Article author is R.W. Burhans, who seems to be an
authority
>on active antenna design, I have seen other articles by the
author
>in other more academic texts.
>
>Jim McVein
>[e-mail]
>
Thanks Jim, I have the article, but did not know that Burhans has
published outside of the article.  Could you pass on the academic
texts he has also written (the name sounds familiar, but I have
not found were from yet).

Brian



From [e-mail] Fri Sep 27 21:56:36 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!news.sgi.com!news-peer.gsl.net!news.gsl.net!portc01.blue.aol.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Active Antenna Designs
Date: 24 Sep 1996 08:52:25 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 38
Sender: [e-mail]
Message-ID: <528li9$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

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

>I'm surprised no-one has mentioned the balanced transformer-feedback
>designs written up by Dallas Lankford and published in the IRCA "DX
>Monitor" and NRC "DX News". A 50-ohm input impedance RF-preamp variant
was
>described by Rohde in one of his QST articles on modern receiver design.
>The Kiwa preamp is the same basic design.

Actually Rohde described it FIRST in RF Design magazine. I used
transformer feedback pre-amps in the early 70's using CATV transistors.

>These preamps can have very low intermodulation distortion, which
>translates to a high dynamic range, which is what you need for an active
>antenna. They do present a lower input impedance than one would like for
a
>voltage probe active antenna, unfortunately.

The main advantage is low noise, the negative feedback does not
deteriorate the noise figure. This is not a concern at HF except for the
first stage,  or following a passive mixer.

I use a simple high power low noise FET source follower at my voltage
probe antennas, and catv bi-polar amplifiers on my loop arrays. I do NOT
use transformer feedback with small loops. With the transistor running at
very high gain, very little feedback is used so the feedback resistance
does NOT deteriorate noise figure enough to be measurable in the overall
noise performance. It's only when gain is greatly reduced by large amounts
of negative feedback that transformer feedback has a noise advantage. All
feedback has an IMD advantage, but with a small antenna we can't use much
feedback or we won't have enough gain.

At HF, it's easy to have ambient EXTERNAL noise at the receiving site
dominate the system noise, even with an non-resonant antenna only one or
two feet long or diameter. No special "tricks" are needed.

73 Tom


From [e-mail] Fri Sep 27 21:56:37 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-atl-21.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!cs.utexas.edu!math.ohio-state.edu!magnus.acs.ohio-state.edu!freenet.columbus.oh.us!not-for-mail
From: [e-mail] (Gerard Foley)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.shortwave
Subject: Re: Adding digital readout to analog radio: How?
Followup-To: rec.radio.amateur.homebrew,rec.radio.shortwave
Date: 25 Sep 1996 10:57:56 -0400
Organization: The Greater Columbus FreeNet
Lines: 31
Message-ID: <52bh9k$[e-mail]>
References: <52bfa5$[e-mail]>
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Tony White ([e-mail]) wrote:
: I'm considering adding a digital frequency readout to my old analog SWR.  I
: like the old beast (Hallicrafters SX-28A) and don't plan to give it up, sinc
e
: it does go up to 42MHz and I'm hard pressed to find a SWR that covers the
: freqs above 30MHz.  I'm wondering: a)would a standard digital frequency
: counter work; b)if so, where would I need to connect the input, and c)whethe
r
: or not I'd need to build an IF stage for the counter so I'd get the proper
: readout.  This is a rackmountable unit, and I'm considering putting this
: project in a 1U rack box.  If I can do it with a standard freq. counter, doe
s
: anyone have schematics for a homebrew unit?

: TIA

You can measure the variable local oscillator frequency with any counter
that covers the range and has sufficient sensitivity.  The number you
get will differ from the received frequency by the value of the
first intermediate frequency following the local oscillator.  The
counter frequency will usually be higher than the received frequency,
but in some receivers or bands it may be lower.

Around twenty years ago there were some counters made which had a
programmable offset so that the value of the intermediate frequency
was automatically added or subtracted from the local oscillator
frequency before it was displayed.  I don't know if any currently
available counters have this ability.

K8EF


--
Gerry


From [e-mail] Fri Sep 27 21:56:38 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!uwm.edu!cs.utexas.edu!math.ohio-state.edu!jussieu.fr!univ-lyon1.fr!howland.erols.net!newsfeed.internetmci.com!news1.mnsinc.com!usenet
From: [e-mail] (Bry)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: amplificateur HF regulation of power
Date: Sun, 22 Sep 1996 19:15:16 GMT
Organization: Monumental Network Systems
Lines: 22
Distribution: inet
Message-ID: <524dpu$[e-mail]>
References: <51os0u$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: bry.mnsinc.com
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[e-mail] (Maillet Dominique) whistled a happy tune like:

|>hi, i whant to make a regulation of power for amplificateur HF.
|>if  introduce in primary voltage in transformateur THT
|>a variable transfo. ( slide regulator )
|>it's correct or is undesirable for a tube ?
|>tnx fer advise.
Yes. I have done this. In the USA/United States/Estados Unidos, we call that
an "AUTOTRANSFORMER" and you can vary the voltage 0-100% of mains/line
voltage. In our case it will be 0-120V AC   or  0-220V AC

This worked VERY well for me using a 7000 Volts transformer as the HT+
or B+ for my "amplificateur" homebrew!

73 de AF4K / G3XLQ

"What.... you think I spoke 'Esperanto?' - Nah!!"

Brian Carling, AF4K / G3XLQ
[e-mail]
http://www.mnsinc.com/bry = MEGALIST + HOCKEY + HAM RADIO = Bry's Page!



From [e-mail] Fri Sep 27 21:56:42 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!cs.utexas.edu!howland.erols.net!newsfeed.internetmci.com!news1.mnsinc.com!usenet
From: [e-mail] (Bry)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: ARRIVED! (was BULLETIN: 14 Year Old Sailor Not Heard in 3 Weeks
Date: Sun, 22 Sep 1996 18:25:58 GMT
Organization: Monumental Network Systems
Lines: 33
Distribution: inet
Message-ID: <524ath$[e-mail]>
References: <51aimv$[e-mail]> <[e-mail]> <51fila$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: bry.mnsinc.com
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[e-mail] (Jeffrey Herman) whistled a happy tune like:

|>Thomas G. McWilliams <[e-mail]> wrote:
|>>Ed Mitchell ([e-mail]) wrote:

|>>: 14 year old Subaru Takahashi is making a solo crossing of the Pacific
Ocean
|>>: from Japan to the United States - in a 30 foot yacht. According to Masa

|>>: Sakamoto, KN6RJ, Subaru, who's call sign is JH0YCG, has not been heard
since
|>>: August 18th.

|>>Most probably, Master Subaru sleeps with the fishes.
|>>Talking to a dead man on ham radio--now that would be some DX!
|>>But what a great QSL card . . .

|>If it had been your son on that boat, Tom, would you have still written
|>those same words?

|>Happily, young Subaru sailed into San Francisco yesterday. Engine
|>trouble prevented him from charging his batteries, thus the reason
|>for no communications.

|>Jeff KH2PZ / KH6

Jeff, I hear that those Subaru engines ARE a problem if you put them in the
water! Now what the heck does this have to do with homebrew radios?

Brian Carling, AF4K / G3XLQ
[e-mail]
http://www.mnsinc.com/bry = MEGALIST + HOCKEY + HAM RADIO = Bry's Page!



From [e-mail] Fri Sep 27 21:56:43 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!newsfeed.internetmci.com!news.bctel.net!noc.van.hookup.net!nic.mtl.hookup.net!rcogate.rco.qc.ca!news.pubnix.net!usenet
From: Mark Hillier <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ARRL Attenuator
Date: Sun, 22 Sep 1996 14:29:25 -0400
Organization: HVW Technologies
Lines: 27
Message-ID: <[e-mail]>
References: <51vrla$[e-mail]>
NNTP-Posting-Host: port1095.pubnix.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
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Rodney Isom wrote:
>
> I'm in the process of building the RF attenuator shown in the 1995
> ARRL handbook to use for foxhunting (the one made with double sided PC
> board and switches, not the active one).
>
> If anyone else has built this device, maybe you can answer a question
> for me.  The instructions say to soak the switches in acetone to
> remove grease.  Does this mean to actually immerse the whole switch in
> the acetone?  If so, for how long?

This step usually isn't necessary. If you think /know that there is
grease on the contact surfaces of the switch, dunk the switch into
acetone and work the switch back-and-forth a few times -that should so
it.
>
> Also, the plans say to solder brass nuts inside the enclosure to screw
> the screws into.  Is it critical that these are brass & not some other
> metal?

Not in terms of the unit's performance, but brass is the easiest to
solder -just try to solder stainless !

Good luck.

Mark, VE2HVW
[e-mail]


From [e-mail] Fri Sep 27 21:56:44 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!news.sprintlink.net!news-stk-3.sprintlink.net!southwind.net!usenet
From: [e-mail] (Zack Clobes)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ARRL Attenuator
Date: 23 Sep 1996 00:43:51 GMT
Organization: SouthWind Internet Access, Inc.
Lines: 30
Message-ID: <524mg7$[e-mail]>
References: <51vrla$[e-mail]>
NNTP-Posting-Host: hut11.southwind.net
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.6

In article <51vrla$[e-mail]>, [e-mail] says...
>
>I'm in the process of building the RF attenuator shown in the 1995
>ARRL handbook to use for foxhunting (the one made with double sided PC
>board and switches, not the active one).
>
>If anyone else has built this device, maybe you can answer a question
>for me.  The instructions say to soak the switches in acetone to
>remove grease.  Does this mean to actually immerse the whole switch in
>the acetone?  If so, for how long?
>
>Also, the plans say to solder brass nuts inside the enclosure to screw
>the screws into.  Is it critical that these are brass & not some other
>metal?

Rodney,
I'm not sure of your intensions for this attenuator but I strongly suggest
building the active attenuator.  Of course, if you are needed a calbrated att,

then the stepped version would be what you need but if it is for T-hunting,
I've had excellent results with the active att.  Other articles I've read on
the circuit claim to give nearly 100dB of attenuation however I have found tha
t
by changing the frequency of the receiver, you have practically infinative
attenuation.

I was able to purchase all of the parts in town and and quite possibly all of
them from Radio Shack (can't remember, it's been a while).

Gud luck,
Zack, AA0XQ



From [e-mail] Fri Sep 27 21:56:45 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!worldlinx.com!thunder.mgl.ca!server2.netrics.com!n2tor.istar!tor.istar!east.istar!ott.istar!istar.net!van.istar!west.istar!n1van.istar!van-bc!unixg.ubc.ca!info.ucla.edu!csulb.edu!news.sgi.com!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!newsfeed.internetmci.com!news.magg.net!news
From: "Dale R. Parfitt" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ARRL Attenuator
Date: Mon, 23 Sep 1996 00:36:15 -0400
Organization: PAR Electronics
Lines: 29
Message-ID: <[e-mail]>
References: <51vrla$[e-mail]>
NNTP-Posting-Host: wpb-101.magg.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
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To: [e-mail]

Rodney Isom wrote:
>
> I'm in the process of building the RF attenuator shown in the 1995
> ARRL handbook to use for foxhunting (the one made with double sided PC
> board and switches, not the active one).
>
> If anyone else has built this device, maybe you can answer a question
> for me.  The instructions say to soak the switches in acetone to
> remove grease.  Does this mean to actually immerse the whole switch in
> the acetone?  If so, for how long?
>
> Also, the plans say to solder brass nuts inside the enclosure to screw
> the screws into.  Is it critical that these are brass & not some other
> metal?
>
> I would appreciate any help.
>
> Rodney Isom, KF4COV
> [e-mail]
> Birmingham, ALHi Rodney,

The brass is used to facilitate soldering. Positioning the nuts is made
easiest by securing them w/ a stainless steel screw while soldering. The
solder will not adhere to the stainless and thus can be easily removed
after soldering.
I would be careful w/ the acetone as it will attack ABS, and
polystyrene, 2 plastics commonly used in switches.

73,  Dale WA2YPY


From [e-mail] Fri Sep 27 21:56:46 1996
Path: news2.epix.net!news3.epix.net!uunet!in2.uu.net!lsi.lsil.com!news
From: Randy Shore <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: ARRL Attenuator
Date: Tue, 24 Sep 1996 17:09:40 -0700
Organization: LSI Logic Corp.
Lines: 20
Message-ID: <[e-mail]>
References: <51vrla$[e-mail]>
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> Also, the plans say to solder brass nuts inside the enclosure to screw
> the screws into.  Is it critical that these are brass & not some other
> metal?

I built the RF attenuator using brass nuts to hold the cover in place.
Using a RF signal generator and spectrum analyzer, I observed that the
cover
did not help isolate the sections and there was some signal getting thru
from the input to the output port.

I removed the cover and brass nuts. I used a thin brass sheet which was
cut to fit the bottom of each section. I carefully soldered each brass
sheet section in place. Make sure to solder all around the brass sheet.
This helped seal each section so that it was RF tight. I tested the unit
again and the RF attenuator performed extremley well. With 20 dB
sections,
I was able to obtain about 120 dB of RF attenuation from 1MHz to 1GHz.


Randy  KC6AND


From [e-mail] Fri Sep 27 21:56:49 1996
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From: [e-mail] (Joel E. Davis)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: BULLETIN: 14 Year Old Sailor Not Heard in 3 Weeks
Date: Sat, 21 Sep 1996 07:44:19 UNDEFINED
Organization: Phoenix Data Net [phone] http://www.phoenix.net
Lines: 30
Message-ID: <[e-mail]>
References: <51aimv$[e-mail]> <[e-mail]> <51efhs$[e-mail]>
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In article <51efhs$[e-mail]> [e-mail](Gerald Sch
mitt ) writes:
>From: [e-mail](Gerald Schmitt )
>Subject: Re: BULLETIN: 14 Year Old Sailor Not Heard in 3 Weeks
>Date: 14 Sep 1996 14:30:20 GMT

>In <[e-mail]> [e-mail] (Thomas G. McWilliams)
>writes:
>>
>>Ed Mitchell ([e-mail]) wrote:
>>: 14 year old Subaru Takahashi is making a solo crossing of the
>Pacific Ocean
>>: from Japan to the United States - in a 30 foot yacht. According to
>Masa
>>: Sakamoto, KN6RJ, Subaru, who's call sign is JH0YCG, has not been
>heard since
>>: August 18th.
>>
>>Most probably, Master Subaru sleeps with the fishes.
>>Talking to a dead man on ham radio--now that would be some DX!
>>But what a great QSL card . . .
>>

>Boy Tom you are some piece of work; the guys asks for help and this is
>what you come up with. What ever happened to the amateur service
>creedo. You know Sakamoto san's family could just easily read this,
>talk about ugly Americans. You sir are an embarassment to the hobby.

The saying is "..takes all kinds" .Is'nt that a shame?




From [e-mail] Fri Sep 27 21:56:51 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news-stock.gsl.net!news.gsl.net!news-dc.gsl.net!news.gsl.net!news-peer.gsl.net!news.gsl.net!www.nntp.primenet.com!nntp.primenet.com!news.sgi.com!news.msfc.nasa.gov!newsfeed.internetmci.com!news.comm.net!usenet
From: "L. Booth" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: cw crystals co.
Date: Sat, 21 Sep 1996 12:54:50 -0500
Organization: CommNet Inc.
Lines: 7
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ts01-port03.nod.comm.net
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I found out the other day that Bob Woods has shutdown CW Crystals. Does
anyone know of another source of reasonably priced crystals for 7.000 to
7.070 mhz. I need a few to fire up my old HT40 station again. Woods was
selling crystals for 4-6 bucks each cut to your frequency.

Big loss to homebrew and old gear folks I think.



From [e-mail] Fri Sep 27 21:56:52 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!swrinde!tank.news.pipex.net!pipex!hole.news.pipex.net!pipex!plug.news.pipex.net!pipex!tube.news.pipex.net!pipex!soap.news.pipex.net!pipex!argonet.co.uk!argbi11
From: RichardáTorrens <[e-mail]>
Newsgroups: alt.radio.digital,alt.radio.scanner,aus.radio.amateur.digital,aus.radio.amateur.misc,de.sci.electronics,rec.models.railroad,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.shortwave,relcom.radio.diagrams,sci.electronics.basics,sci.electronics.design,sci.electronics.misc,sci.electronics.repair,tw.bbs.rec.radio,tw.bbs.sci.electronics
Subject: Re: Digital Volt & / or Amp Meter
Date: Sun, 22 Sep 1996 18:00:20 BST
Organization: ArgoNet, but does not reflect its views
Lines: 24
Distribution: world
Message-ID: <[e-mail]>
References: <[e-mail]>
Reply-To: RichardáTorrens <[e-mail]>
NNTP-Posting-Host: ao051.du.pipex.com
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In article <[e-mail]>, [e-mail]
(Jack L. Reed) wrote:
>
> Anyone know where I can get a kit for a digital volt meter and
> /or a ditigal amp meter for 12 Volt dc model train layout ???

You won't get a 'kit' but you can get a DMM module. What exactly do you
want?

--
       /|        Richard Torrens - [e-mail]
      / |
     /  |        4 Q D
    / | |        We manufacture
   / /| |        MOSFET controllers for battery operated motors
  / / | |        See us on http://www.argonet.co.uk/users/4qd
 /_/__| |____    our www site contains FAQ sheet on motors & controllers
/_____   ____\   and a selection of interesting circuit diagrams
 / _ \| |  _ \
| | | | | | | |  Phone/fax [phone]
| |_| | | |_| |
 \__\_\ |____/   We use an Acorn RISC-PC 32 bit RISC computer




From [e-mail] Fri Sep 27 21:56:53 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!news.mindspring.com!uunet!in2.uu.net!news.euro.net!usenet
From: Teun <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: diode
Date: 21 Sep 1996 11:37:54 GMT
Organization: EuroNet Internet
Lines: 7
Message-ID: <[e-mail]>
NNTP-Posting-Host: p222.ztm.euronet.nl
Mime-Version: 1.0
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Hi everybody,

I am looking for the equivalent type diode >>RLS 135<<  in kenwood
ts 850 BAND PASS circuit.

Who can help me out.
73 Teun, Pa3fvw.


From [e-mail] Fri Sep 27 21:56:54 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!world1.bellatlantic.net!news2.cais.net!news.cais.net!van-bc!news.mindlink.net!sol.ctr.columbia.edu!news.msfc.nasa.gov!newsfeed.internetmci.com!in3.uu.net!munnari.OZ.AU!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: do we build?  was(re: arrl survey ignores 7 of 8 wrc-99
Date: 22 Sep 96 23:38:41 GMT
Organization: ucsd usenet gateway
Lines: 49
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

[e-mail] (Jeffrey Herman) wrote:

> (snip...)
> Now, I think we're going to have to redefine "homebrewing" - I've
> got an article here from QEX titled The Ultimate VFO (April 1996);
> the circuit contains two major ICs, a clock module, a handful of
> resistors, and a few push-button switches. Is snapping ICs into
> sockets considered homebrew? I'll say "no", and call something like
> this a kit, instead. I'll snap it together but won't make any claim
> that I homebrewed a VFO. I've homebrewed VFOs before from scratch
> and this project won't begin to come close to the detailed work that
> those necessitated. And it won't be as rewarding, either.

So now it's "real" vs. "non-real" homebrewing, is it? I've said it
before, and I'll say it again: in an era when appliance operation is
the norm and most hams are baffled by coax connectors, I'm prepared to
be lenient on the definition of "homebrew". I too have homebrewed VFOs
from scratch. Both ones with JFETs in them, and ones with DDS chips in
them. The DDS ones work better and are less hassle all around.

To muddy the waters, consider a DDS VFO I built. I bought a pc board
from FAR Circuits to build a DDS VFO from an article in 73 Magazine. I
designed and built (wire-wrap) a microcontroller interface board, and
programmed the microcontroller myself. Is the net result homebrew?
Damn right! And, yes, it *was* rewarding, despite (or possibly because
of) the Qualcomm DDS chip, computer clock oscillators, multiple micro-
controllers, assorted 74LS TTL, even an intelligent LCD display.

Just because the electronics industry is moving toward greater
integration, with the attendant reduced parts count, reduced hassle,
increased reliability, and so on, does not render new projects
non-homebrew, just because they don't look like something out of a
1955 ARRL Handbook. You can buy a significant portion of an HF
receiver on a chip - does using such a chip render a project less
homebrew? Or does it show that the designer was smart, knowing what he
or she could buy off the shelf, and using it wisely?

I've beeen playing with a Huff and Puff VFO the last little while -
the VFO part is a standard JFET affair from _Solid State Design for
the Radio Amateur_, while the rest is 74HC logic, with a computer
clock oscillator providing the reference. Is it homebrew? Yes! Is it
rewarding? Yes! Was it mysterious and incomprehensible to members of
the local ham club Friday night? Sadly, yes...

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



From [e-mail] Fri Sep 27 21:56:56 1996
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From: [e-mail] (Mark Little)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew
Subject: re: do we build?  was(re: arrl survey ignores 7 of 8 wrc-99 issues!
Date: 20 Sep 96 17:07:44
Organization: Microtronics Information Systems
Lines: 34
Message-ID: <[e-mail]>
References: <51erah$[e-mail]>
NNTP-Posting-Host: ppp45as.mtx.net.au
X-Newsreader: mNews 1.0 (release 20.08.96)
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>
>
> [e-mail] wrote:
>
> >I have NEVER, EVER, in over ten years of debating this issue, seen a
> >no-code advocate actually advocate the *banning* of CW from the bands.
> >Not once.  (of course, now that I've said that, one of the pro-coders
> >will probably start up a phony "ban the code" thread in an effort to
> >taint the discussion with a bunch of bogus anti-no-code distortions).
>
> >Carl - wa6vse
> >[e-mail]
> ==============================================================
> BUT - those sections of the band reserved for non-phone uses shrink as
> more and more phone operators crowd the remainder. In the '50's, 75
> meters was only 200 kHz, and there was no phone on 40 at all!
>
> I suspect that in 20-30 years, there will be no parts of the band
> reserved for non-phone usage. It will all then be by "gentlemens
> agreement".
>
> Jerry    W4UKU    [e-mail]
>
>
>

One point to bear in mind is that some countries only have "gentleman's
agreements" about how the HF band works NOW. As long as the bandplan
has the general agreement of amateurs, then it will be followed.

Mark.




From [e-mail] Fri Sep 27 21:56:58 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!hunter.premier.net!news1.erols.com!howland.erols.net!newsfeed.internetmci.com!news.ais.net!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew
Subject: Re: do we build?  was(re: arrl survey ignores 7 of 8 wrc-99 issues!
Date: 22 Sep 1996 17:14:09 GMT
Organization: American Information Systems, Inc.
Lines: 35
Message-ID: <523s51$[e-mail]>
References: <[e-mail]> <[e-mail]> <51sur0$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ts03-07.dialup.ais.net
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Xref: news2.epix.net rec.radio.amateur.misc:106867 rec.radio.amateur.homebrew:16787

In <51sur0$[e-mail]>, [e-mail] (Jeffrey Herman) writes:
>
>Now, I think we're going to have to redefine "homebrewing" - I've got
>an article here from QEX titled The Ultimate VFO (April 1996); the
>circuit contains two major ICs, a clock module, a handful of resistors,
>and a few push-button switches. Is snapping ICs into sockets considered
>homebrew? I'll say "no", and call something like this a kit, instead.
>I'll snap it together but won't make any claim that I homebrewed a
>VFO. I've homebrewed VFOs before from scratch and this project won't
>begin to come close to the detailed work that those necessitated. And
>it won't be as rewarding, either.
>

So you're stating that the use of *modern* parts like ICs means that
it's not "homebrew"???

What if I design the IC? (Something I do regularly at work ...) Does
that count?

What if I program the IC (as in a uController)?  Does that count?

Or does it have to be solely discrete parts (tubes?)  hand-wired between
nails pounded into a hunk of wood?  (which is what you seem to view as
"homebrew")

We've already established that many, if not most, hams are not building
*anything* ... wouldn't getting lots of them building
(and debugging) ever-more-complex kits be a step in the right direction?

As usual, Jeff, your arguments are an outlandish mix of troll and
"traditional-eleteist" ...

Carl - wa6vse
[e-mail]



From [e-mail] Fri Sep 27 21:56:59 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-atl-21.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!ddsw1!news.mcs.net!in-news.erinet.com!usenet
From: Dan Puckett <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Does anybody know what a D2824C is?
Date: Sat, 21 Sep 1996 20:35:21 -0700
Organization: EriNet Online 513 436-1700 (Voice)
Lines: 7
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: 207.90.122.41
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 2.01KIT (Win16; U)

I've been playing at converting a Rat Shack CB to 10 meters.  The PLL in
the synthesizer is marked D2824C  with what looks like a manufacturer's
logo that is a stylized "NPC".  What is this little beast?

73 and thanks in advance,

Dan WD8AAU


From [e-mail] Fri Sep 27 21:57:01 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!newsfeed.internetmci.com!malgudi.oar.net!hyperion.wright.edu!news.wright.edu!desire.wright.edu!nyoung
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Early radio in Latin America?
Date: 25 Sep 96 17:20:11 EST
Organization: Wright State University
Lines: 15
Message-ID: <[e-mail]>
NNTP-Posting-Host: desire.wright.edu

I'm looking for any info (copies of printed stuff especially)
on the growth of radio as an industry in Latin America. I'm
really interested in knowing what was going on in Latin America
during the early days of radio (1890-1920) when most of the
world was beginning to learn from Hertz, Marconi &c. Crystal
sets and one-tube radios are a particular interest.

Reply to me via email direct, unless you actually believe
that there are others who might be as demented as I. The
address is [e-mail]

73
Nils
WB8IJN



From [e-mail] Fri Sep 27 21:57:02 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!tank.news.pipex.net!pipex!news.be.innet.net!INbe.net!news.nl.innet.net!INnl.net!hunter.premier.net!www.nntp.primenet.com!nntp.primenet.com!netcom.com!dgf
From: [e-mail] (David Feldman)
Subject: Expanding foam (urethane?) where to get?
Message-ID: <[e-mail]>
Organization: Organization? Me?
Date: Fri, 20 Sep 1996 01:05:17 GMT
Lines: 14
Sender: [e-mail]

I'm working on mounting several VHF radios into a ZERO/Halliburton type
"suitcase" cabinet. I'd like to use urethane (expanding) foam to position
the radios, instead of building some complicated metal structure (the
radios are various ICOM IC-?02 series VHF/SSB rigs). Anyway, where do
you buy the stuff? As I recall, it's two chemicals, and when you mix them,
they make a foam that then hardens. You can form the stuff by pumping it
into a heavy duty plastic bag, forming it around the equipment you want
to package, and then let it harden. Then after it's hardened, you can cut
it with a knife to make openings (for cables), adjustments, and such.

Anyway, is this stuff  bought at hardware stores, paint stores, or where?

73 Dave WB0GAZ [e-mail]



From [e-mail] Fri Sep 27 21:57:03 1996
Path: news2.epix.net!news3.epix.net!uunet!in2.uu.net!cs.utexas.edu!howland.erols.net!vixen.cso.uiuc.edu!news.ais.net!usenet
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Expanding foam (urethane?) where to get?
Date: 25 Sep 1996 01:57:10 GMT
Organization: American Information Systems, Inc.
Lines: 27
Message-ID: <52a3hm$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: ts02-26.dialup.ais.net
X-Newsreader: IBM NewsReader/2 v1.2.5

In <[e-mail]>, [e-mail] (David Feldman) writes:
>I'm working on mounting several VHF radios into a ZERO/Halliburton type
>"suitcase" cabinet. I'd like to use urethane (expanding) foam to position
>the radios, instead of building some complicated metal structure (the
>radios are various ICOM IC-?02 series VHF/SSB rigs). Anyway, where do
>you buy the stuff? As I recall, it's two chemicals, and when you mix them,
>they make a foam that then hardens. You can form the stuff by pumping it
>into a heavy duty plastic bag, forming it around the equipment you want
>to package, and then let it harden. Then after it's hardened, you can cut
>it with a knife to make openings (for cables), adjustments, and such.
>
>Anyway, is this stuff  bought at hardware stores, paint stores, or where?
>
>73 Dave WB0GAZ [e-mail]
>

Dave,

If you don't find it anywhere else, check boating supply places like
West Marine and Boat US ... it's often used in marine refrigeration
installations ...

73,
Carl - wa6vse
[e-mail]




From [e-mail] Fri Sep 27 21:57:04 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!www.nntp.primenet.com!nntp.primenet.com!news.sgi.com!news-peer.gsl.net!news.gsl.net!portc01.blue.aol.com!newsstand.cit.cornell.edu!news.acsu.buffalo.edu!news.drenet.dnd.ca!crc-news.doc.ca!nott!bcarh189.bnr.ca!bmerhc5e.bnr.ca!bcarh8ab.bnr.ca!news
From: [e-mail] (Dean Denter)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Expanding foam (urethane?) where to get?
Date: 25 Sep 1996 14:15:51 GMT
Organization: Bell Northern Research
Lines: 44
Message-ID: <52beqn$[e-mail]>
References: <[e-mail]> <52a3hm$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: bcarsfce.bnr.ca
X-Newsreader: knews 0.9.6

In article <52a3hm$[e-mail]>,
        [e-mail] writes:
>In <[e-mail]>, [e-mail] (David Feldman) writes:
>>I'm working on mounting several VHF radios into a ZERO/Halliburton type
>>"suitcase" cabinet. I'd like to use urethane (expanding) foam to position
>>the radios, instead of building some complicated metal structure (the
>>radios are various ICOM IC-?02 series VHF/SSB rigs). Anyway, where do
>>you buy the stuff? As I recall, it's two chemicals, and when you mix them,
>>they make a foam that then hardens. You can form the stuff by pumping it
>>into a heavy duty plastic bag, forming it around the equipment you want
>>to package, and then let it harden. Then after it's hardened, you can cut
>>it with a knife to make openings (for cables), adjustments, and such.
>>
>>Anyway, is this stuff  bought at hardware stores, paint stores, or where?
>>
>>73 Dave WB0GAZ [e-mail]
>>
>
>Dave,
>
>If you don't find it anywhere else, check boating supply places like
>West Marine and Boat US ... it's often used in marine refrigeration
>installations ...
>

Not sure where you live, but if you're in one of the cooler climates,
you may be able to get aerosol cans of it in hardware/building supply
stores.  Here in Canada, its used as exterior insulation around
houses (typically to fill gaps where the foundation and the siding
join).

This stuff turns almost rock hard once it has cured, I would think that
foam-rubber would be more useful for your purpose since it's flexible.
Not real sure where you can get this stuff, my last source dried up
2 years ago.  I know it's available, just can't remember where to get
it (it's made by Dow Chemical I think).

regards,
Dean.
--
Dean Denter               work -> [e-mail]
VA3CDD                    play -> [e-mail]
[[[[[[[[[[[[[[I speak only for myself]]]]]]]]]]]]]]



From [e-mail] Fri Sep 27 21:57:05 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!news.sgi.com!news.msfc.nasa.gov!newsfeed.internetmci.com!in1.uu.net!nebo.vii.com!xmission!news
From: [e-mail] (Greg)
Newsgroups: rec.radio.amateur.homebrew,rec.ham-radio.swap,rec.radio.swap
Subject: FS:Heathkit Crystal Filters
Date: 21 Sep 1996 22:20:06 GMT
Organization: Your Organization
Lines: 8
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Heathkit PN 404-284-1 and 404-283.Crystal Fileter assemblies plus
swithces, caps and resistor as originallyinstalled.  Just pulled from
old SB-101 chassis.

Fifteen Dollars (US$) for the two and I pay shipping anywhere in US or
Canada
Greg KB6WKW



From [e-mail] Fri Sep 27 21:57:06 1996
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From: Rocci <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Gin-Pole
Date: Sat, 21 Sep 1996 15:53:18 -0400
Organization: AT&T WorldNet Services
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Has anyone seen a published design for a decent gin-pole that can be
constructed with commonly available tools and parts? If so, which
publication, year month, etc.?


Joe
WA3CMQ


From [e-mail] Fri Sep 27 21:57:07 1996
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From: [e-mail] (Jim Potter)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Gin-Pole
Date: Sun, 22 Sep 1996 02:55:44 GMT
Organization: The Santa Fe Institute
Lines: 36
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Rocci <[e-mail]> wrote:

>Has anyone seen a published design for a decent gin-pole that can be
>constructed with commonly available tools and parts? If so, which
>publication, year month, etc.?
>
>
>Joe
>WA3CMQ
I have two. The first is made from a length of 1-1/2" steel pipe
(HEAVY!) U-bolts are used to clamp angle iron to the pipe at two
places about 3 feet apart. A pulley is atached to a a pipe cap with an
eyebolt at the top end. The pole is lifted above two rungs of the
tower and then lowered so the angle iron engages the rungs. The
details depend on the tower design. Mine is an old 1959 vintage Rohn
#6 which is just a heavy duty TV tower. The rungs are stamped sheet
metal and the thing is climbable. Not a spec of rust after 10 years in
Illinois and 20+ in New Mexico.

The second is made from 4" aluminum tubing with fairly thin wall. The
brackets are fastened similarly.  The pulley is fastened to a bolt
through the pipe near the top and part of the tubing is cut away to
clear the pulley.

That is not a detailed design, but maybe it'll give you a few ideas.
It doesn't have to be complicated, but be sure that it is strong
enough. Test it at low elevation!

73 de K9GXC, Jim


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



From [e-mail] Fri Sep 27 21:57:08 1996
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From: [e-mail](michael silva)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: grid leak ?
Date: 21 Sep 1996 19:22:48 GMT
Organization: Netcom
Lines: 36
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References: <[e-mail]>
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X-NETCOM-Date: Sat Sep 21  2:22:48 PM CDT 1996

In <[e-mail]>
[e-mail] (Joel Govostes) writes:

<...questions about grid-leaks removed...>

I've always found grid-leak biasing a little mysterious myself, maybe
due to the different explanations I've read, but I'll give it a try:

The reason a grid-leak detector detects is that it is operating near
the plate-cutoff "knee" of its curve, so the positive half-cycles of
the incoming signal produce a greater increase in plate current than
the negative half-cycles decrease it, resulting in an output that
more-or-less follows the modulation.  The purpose of grid-leak biasing
is to automatically bias the tube into the knee region.  With a
theoretically perfect diode such biasing wouldn't work -- the grid
would bias itself to the level of the incoming signal and no more.
However, due to the impact of electrons travelling to the plate upon
the grid, grid current flows in a tube when the grid is still slightly
negative WRT the cathode.  This one-way current flow "ratchets up" the
negative voltage on the grid condenser (keeping with the old
terminology) until, with the reduced plate current and the increased
grid-leak current caused by the higher negative grid bias, an
equilibrium is reached.  This point depends on the tube and the
grid-leak resistance chosen.  The time constant of the grid circuit is
typically on the order of 100 uS (e.g. 50uuF, 2 Mohms), so the grid
voltage can change fast enough to follow the signal modulation.

Hope this sheds more light than heat...

(BTW, there's a mailing list for tube homebrew called "glowbugs".
Subscribe by sending the message "subscribe" to [e-mail]
and join in the fun.)

73,
Mike, KK6GM



From [e-mail] Fri Sep 27 21:57:09 1996
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From: [e-mail] (Joel Govostes)
Newsgroups: rec.radio.amateur.homebrew
Subject: grid leak ? part II
Date: Sat, 21 Sep 1996 10:30:34 -0500
Organization: Cornell University
Lines: 11
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Forgot about my other question:

When the tuned-circuit/antenna side of the grid-leak-capacitor is "+",
then electrons rush from the grid onto the nearest side of the capacitor.
Doesn't this make the grid itself less negative, and cause grid current to
flow??

The books say that such a detector produces little or no grid current.
Seems to me that every other half-cycle of the input signal would cause
grid current to flow (electrons being attracted to the grid itself).
Thanks for any help on this,  JWG


From [e-mail] Fri Sep 27 21:57:10 1996
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From: William W Janssen <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: grid leak ? part II
Date: 21 Sep 1996 18:10:08 GMT
Organization: CalWeb Internet Services, Inc.
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[e-mail] (Joel Govostes) wrote:
>Forgot about my other question:
>
>When the tuned-circuit/antenna side of the grid-leak-capacitor is "+",
>then electrons rush from the grid onto the nearest side of the capacitor.
>Doesn't this make the grid itself less negative, and cause grid current to
>flow??
>
>The books say that such a detector produces little or no grid current.
>Seems to me that every other half-cycle of the input signal would cause
>grid current to flow (electrons being attracted to the grid itself).
>Thanks for any help on this,  JWG

When the grid goes positive it collects electrons which then
makes the grid more negative. The result is the grid voltage follows
the peak positive value so the sum of the input and the negative
grid voltage is near zero.

The old tubes did not have a good vacuum and the grid leak had to
be selected to match the tube that was in use. They were some
times arranged as plug-in units.

Bill K7NOM



From [e-mail] Fri Sep 27 21:57:12 1996
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From: [e-mail] (Joel Govostes)
Newsgroups: rec.radio.amateur.homebrew
Subject: Grid leak in simple rcvrs (???)
Date: Sat, 21 Sep 1996 10:18:53 -0500
Organization: Cornell University
Lines: 37
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I have a question about the grid-leak in a triode receiving tube such as
was used back in the 20s/30s.

Say you have a triode and are using it as a detector.  The antenna is
coupled to a L/C variable tuned (parallel) circuit.  This tuned circuit
connects across the input of the triode, grid to cathode.  Now the antique
radio books show the connection to the GRID as interrupted by a grid-leak
capacitor.  Across the capacitor is connected a resistor of high value.

I don't understand how this detects.  From what I can see, you want the
grid voltage to vary at audio freqhencies, so that the plate current on
the tube will also vary at audio frequencies.  Then the output of the tube
drives the headphones with the original AF modulation that was "riding"
the carrier at the transmitter.

How does the grid-leak capacitor+resistor cause the grid voltage to vary
in this way?

When the tuned-circuit/antenna side of the grid-leak capacitor is "+",
then the grid-side of the capacitor is "-".  (At this point electrons are
being removed from the grid to the nearest side of the capacitor).  So now
the grid is more positive.  The plate current increases.

During the next half-cycle (rf), the tuned-circuit/antenna side of the
grid-leak capacitor is "-".  Electrons leave the grid-side of the cap and
are forced back onto the grid. Now the grid is more negative. Plate
current decreases.

What does the grid-leak resistor do, in the meantime?  When does the
capacitor discharge across it, and how does this accomplish detection?
Over a period of time it would seem that the grid would get more and more
negative and eventually cut off plate current.  How do you "know" when the
grid-leak-capacitor will discharge thru the resistor???

Thanks for any help on this.  It is very fundamental, but the books I've
found don't explain very well what's going on, and how you can get away
without using a grid bias battery.        73,  JWG


From [e-mail] Fri Sep 27 21:57:13 1996
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From: [e-mail] (Spencer Trombly)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ham-Homebrew Digest V96 #413, broken transformers
Date: 24 Sep 96 03:36:41 GMT
Organization: ucsd usenet gateway
Lines: 10
Message-ID: <Pine.SUN.3.94.960923232637.29880A-100000@polaris>
References: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

If its a good size power transformer and the primary is the first winding
on the core. Cut out the secondary windings and replace them with a 3 or
4 turn secondary using some welding cable as the wire. Attach some very
large alligator clips and use it to thaw frozen pipes. Dont leave it on to
long or you will melt the solder joints.
73
Spencer Trombly W1GAK
[e-mail]




From [e-mail] Fri Sep 27 21:57:13 1996
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From: RF BURNS <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HTX 202
Date: 23 Sep 1996 01:43:36 GMT
Organization: FASTNET(tm) PA/NJ/DE Internet
Lines: 17
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To: [e-mail]

step one:    Go to garage

step 2:      Find a big hammer

step 3:      smash your radio



Follow these steps its a shoe in break your radio.

There are no mods this is the reason the front end on the radio is tight
it is not a broad band radio


Doug




From [e-mail] Fri Sep 27 21:57:14 1996
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From: [e-mail] (Bry)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: HTX 202
Date: Mon, 23 Sep 1996 00:27:51 GMT
Organization: Monumental Network Systems
Lines: 28
Distribution: inet
Message-ID: <525040$[e-mail]>
References: <01bba4b7.bbf09fe0$[e-mail]> <524q08$[e-mail]>
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This sounds JUST like the funny stuff I read at the "Destructive Garden" Web
Site! (Listed in the comedy LINKS at my Web Site for all you die-hard
surfers!)

RF BURNS <[e-mail]> whistled a happy tune like:

|>step one:    Go to garage

|>step 2:      Find a big hammer

|>step 3:      smash your radio



|>Follow these steps its a shoe in break your radio.

|>There are no mods this is the reason the front end on the radio is tight
|>it is not a broad band radio


|>Doug



Brian Carling, AF4K / G3XLQ
[e-mail]
http://www.mnsinc.com/bry = MEGALIST + HOCKEY + HAM RADIO = Bry's Page!



From [e-mail] Fri Sep 27 21:57:15 1996
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From: [e-mail] (Richard Friedrich)
Newsgroups: rec.radio.amateur.homebrew
Subject: I need a lcd display 1 by 16 or whatever (14 pin)
Date: 23 Sep 1996 20:05:16 GMT
Organization: The University of Texas at Austin
Lines: 15
Message-ID: <526qhs$[e-mail]>
NNTP-Posting-Host: slip-22-14.ots.utexas.edu
X-Newsreader: WinVN 0.90.4

I need a lcd display for a small project. one or two line, 16 or 20 character.

I also need the pinout.
I didnt want to pay digikey ~$35.


any one got a used one floating around or know a surplus source?

thanks



richard





From [e-mail] Fri Sep 27 21:57:16 1996
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From: Woody White <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ideas for MILLI-OHMETER?
Date: Sat, 21 Sep 1996 02:52:47 -0700
Organization: I am disorganized...
Lines: 31
Message-ID: <[e-mail]>
References: <51vdsc$[e-mail]>
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If all else permits.... connect a current controlled DC power supply
across the rail (to gnd). Apply as much current through the rail as it
will tolerate without damage *a welder might be a bit unreasonable :-)*
Meassure voltage drops along the rail and perhaps you can detect where
along it's lenght the short is.
my .02....  Woody


William Kresl wrote:
>
> HI! I have an application to track down a +5volt rail SHORT on
> some computer equipment. I have a FLUKE model 77 DVM. Any ideas
> on a good circuit to built up to to use as an add-on for this?
> I'd like to hear your suggestions, rather then plunge head-first
> into a pile of old ham mags.
>
> Thanks,
> Bill-WB9BBC
>
> --
> Wm Kresl
> WB9BBC @KD9JK.WI.USA.NOAM
> Delavan, WI  USA

--
de  Woody (WB4QXE) -  [e-mail]
Electron Microscopist/Microanalysist,
Ham radio "homebrewer", shade tree mechanic,
'90 Nissan 240SX, wish still had my Mcycle too!
http://www.geocities.com/capecanaveral/3722


From [e-mail] Fri Sep 27 21:57:17 1996
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From: [e-mail]          (Pierre Tremblay)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ideas for MILLI-OHMETER?
Date: 21 Sep 1996 15:30:32 GMT
Organization: Le Club des utilisateurs d'IBM PC de Montreal
Lines: 35
Message-ID: <5211mo$[e-mail]>
References: <51vdsc$[e-mail]>
Reply-To: [e-mail]         (Pierre Tremblay)
NNTP-Posting-Host: 205.151.5.103
X-Newsreader: IBM NewsReader/2 v1.9d - NLS

In <51vdsc$[e-mail]>, [e-mail] (William Kresl)
writes:
>HI! I have an application to track down a +5volt rail SHORT on
>some computer equipment. I have a FLUKE model 77 DVM. Any ideas
>on a good circuit to built up to to use as an add-on for this?
>I'd like to hear your suggestions, rather then plunge head-first
>into a pile of old ham mags.
>
>Thanks,
>Bill-WB9BBC
>
>
>
>--
>Wm Kresl
>WB9BBC @KD9JK.WI.USA.NOAM
>Delavan, WI  USA

Computer power supplies can light up a car headlight without shutting down.

I would cut the 5 volt supply wire and insert that or a 12V 5A halogen bulb in
 series.
It will feed enough current into your short yo can

1- Feel around the board for an overheating chip  and

2- mesure a few millivolts on your 5 volt shorted line:
when it says 0.00 milivolts you must not be very far from your short!




Pierre Tremblay VE2BRD
Professeur de Physique au college de Bois-de-Boulogne

President, le Club des utilisateurs d'IBM PC de Montreal



From [e-mail] Fri Sep 27 21:57:18 1996
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From: [e-mail] (William Kresl)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ideas for MILLI-OHMETER?
Date: Sun, 22 Sep 96 03:16:15 GMT
Organization: townsquare.net
Lines: 49
Message-ID: <522eiq$[e-mail]>
References: <51vdsc$[e-mail]>
NNTP-Posting-Host: cnc402031.concentric.net
X-Newsreader: News Xpress Version 1.0 Beta #3

WOW, great suggestions from you ALL! Thanks! Here's some additional info
that I left out regarding the shorted equipment VICTIM, which is a 2GIG
SCSI hard drive. I plugged it into my PACKET computer one day, and it SMOKED
the drive and shorted out the +5volt rail. I checked the voltage out of the
supply with a DVM and +5v/+12v checked OK. I suspect high ripple was the
culprit that killed the drive, tho I haven't checked it with a scope. I have
since replaced the computer case/power supply rather then wasting time
trying to debug an el-cheapo switching supply. System now works fine, drive
still dead. Due to the fine traces and sensitive nature of this drive, I am
leery of injecting BIG CURRENT into it. I DO want to make this drive WORK!

The SCSI drive is mostly surface mount devices on the underside of the PC
board, and I believe the smoke came from the top side (underneath the sealed
mechanical drive housing). I believe it was a 'smurf-mount' component that
died, smelling like a resitor. I hope NO active IC's were destroyed!

I especially liked the suggestion from Leo, PE1RHX, to use an AF amp and
inject an AF signal into the shorted rail and monitor along the rail with
a discarded cassette tape head til the sig stops (@short). This may be hard
to do on a multi-layer board with 'smurf-mount'. I may try it.

Well, I haven't tackled the trouble-shooting job yet...so please keep those
cards/letters and suggestions coming in. Best suggestions gets an honorable
mention and big thanks from ME, as well the satisfaction that YOU helped out
another ham in need. THAT plus $0.80 will get you a coffee ANYWHERE! Thanks!

Keep Suggesting,
Bill-WB9BBC

--
In article <51vdsc$[e-mail]>,
   [e-mail] (William Kresl) wrote:
>HI! I have an application to track down a +5volt rail SHORT on
>some computer equipment. I have a FLUKE model 77 DVM. Any ideas
>on a good circuit to built up to to use as an add-on for this?
>I'd like to hear your suggestions, rather then plunge head-first
>into a pile of old ham mags.
>
>Thanks,
>Bill-WB9BBC
>
>
>


--
Wm Kresl
WB9BBC @KD9JK.WI.USA.NOAM
Delavan, WI  USA


From [e-mail] Fri Sep 27 21:57:19 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!nntp.earthlink.net!usenet
From: [e-mail] (Todd Owen)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Ideas for MILLI-OHMETER?
Date: Wed, 25 Sep 1996 01:00:20 GMT
Organization: Earthlink Network, Inc.
Lines: 16
Message-ID: <529vdn$[e-mail]>
References: <51vdsc$[e-mail]>
NNTP-Posting-Host: cust97.max8.washington.dc.ms.uu.net
X-Newsreader: Forte Free Agent 1.0.82

See 73 Amateur Radio Today, December 1995, pg 34...
for a milli-ohm DMM extension circuit.

Works great! simple design too.


--73, Todd KE4UDN

------------------------------------------------------------------
Todd Owen              Hanover Engineers, P.C.
804-730-0011 (Voice)   9464 Chamberlayne Road
804-730-4012 (Fax)     Mechanicsville, VA 23111

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



From [e-mail] Fri Sep 27 21:57:20 1996
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From: "Bill C." <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Is JAN Crystal poor quality? / phone number
Date: Sat, 21 Sep 1996 11:35:07 -0700
Organization: The Internet Ramp
Lines: 12
Message-ID: <[e-mail]>
References: <[e-mail]> <51ttfn$[e-mail]>
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My own experience with Jan crystals:

They failed to work in cold weather 100%.

They failed to work at all - 10%

I buy from Sentry Manufacturing. They work 100%... under all conditions I
have exposed them to. That is just my experience, but that is the
experience that counts for me.

       Bill  KU8H



From [e-mail] Fri Sep 27 21:57:21 1996
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From: Douglas Dwyer <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Is JAN Crystal poor quality? / phone number
Date: Tue, 24 Sep 1996 12:35:29 +0100
Organization: FP
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Distribution: world
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 <51ttfn$[e-mail]> <[e-mail]>
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In article <[e-mail]>, "Bill C." <[e-mail]> writes
>My own experience with Jan crystals:
>
>They failed to work in cold weather 100%.
>
>They failed to work at all - 10%
>
>I buy from Sentry Manufacturing. They work 100%... under all conditions I
>have exposed them to. That is just my experience, but that is the
>experience that counts for me.
From outside the US I cannot comment on individual Xtals  however:
Crystals that stop when cold? this is a symtom of crystals sealed in a
moist atmosphere. When the crystal gets cold the atmosphere in the
crystal reaches dew point and dew forms on the crystal adsorbing
vibrating energy and increasing resistance, the frequency also drops
50ppm or so. If your oscillator circuit is very active the crystal wont
stop but the freq still drops.
Crystals are best sealed in nitrogen with a -40 dew point.
Modern crystals are normally resistance welded like metal transistors ,
older processes use solder seal, not always bad. I have seen Xtals
sealed with heat shrink ! not so good.
Regards
Douglas Dwyer
Frequency Precision Ltd
Shorts Northlew Okehampton Devon UK EX20 3NR
Consultant and Designer for Analog, RF, Crystal Oscillators,
TCXOs, OCXOs, SAWOs, Sensors.
Phone/Fax [phone]
Web page http://ourworld.compuserve.com/homepages/frequency_Precision/



From [e-mail] Fri Sep 27 21:57:22 1996
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From: David Keith <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.swap,sci.electronics.equipment
Subject: Lodestar Grid Dip Meter: Opinions?
Date: 18 Sep 1996 02:36:39 GMT
Organization: CompuServe, Inc. (1-800-689-0736)
Lines: 6
Message-ID: <51nn7n$b0i$[e-mail]>
Xref: news2.epix.net rec.radio.amateur.equipment:32421 rec.radio.amateur.homebrew:16757 rec.radio.swap:72932 sci.electronics.equipment:4697

Has anyone used a Lodestar DM-4061 grid dip meter?
I'd appreciate comments on this and other meters.

Thanks,

Dave KD7TT


From [e-mail] Fri Sep 27 21:57:23 1996
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From: "Rob Hunt" <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: looking for CELWAVE book
Date: 22 Sep 1996 00:37:48 GMT
Organization: A Customer of TPG Internet Pty Ltd
Lines: 6
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I am looking for a book put out by celwave called "LAND AND MARINE
TECHNICAL MANUAL"
IF ANY ONE HAS A COPY THEY WOULD LIKE TO GET RID OF PLS CONTACT ME
Thanks
Rob Hunt
[e-mail]


From [e-mail] Fri Sep 27 21:57:24 1996
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From: [e-mail] (Bry)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Manual for Hewlett-Packard 415B
Date: Sun, 22 Sep 1996 19:02:14 GMT
Organization: Monumental Network Systems
Lines: 15
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[e-mail] whistled a happy tune like:

|>I am looking for a copy of the manual for the Hewlett-Packard 415B Square
Law Meter. If you
|>such a beast let me know also let me know what the xerox cost may be.

Manuals are found via the file manuals.txt available at:

http://www.mnsinc.com/bry/


Brian Carling, AF4K / G3XLQ
[e-mail]
http://www.mnsinc.com/bry = MEGALIST + HOCKEY + HAM RADIO = Bry's Page!



From [e-mail] Fri Sep 27 21:57:24 1996
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From: [e-mail] (Andrew Palmer)
Newsgroups: rec.radio.amateur.homebrew
Subject: micro atv transmitter
Date: 18 Sep 1996 09:40:35 GMT
Organization: Efficient Software Internet Service
Lines: 3
Message-ID: <51og2j$[e-mail]>
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i am looking for a current schematic diagram for a micro atv
transmitter operating on 434mhz and/or 922mhz, suitable for my
rc helicopter project


From [e-mail] Fri Sep 27 21:57:27 1996
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From: [e-mail] (Joe Landis)
Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.swap
Subject: Mid Atlantic VHF conf & Packrats Hamarama announcement
Message-ID: <1996Sep20.101552.645@main03>
Date: 20 Sep 96 10:15:52 EST
Distribution: phl,pa,nj,del,md,dc,world
Organization: North American Drager - Telford, PA
Lines: 77
Xref: news2.epix.net rec.radio.amateur.homebrew:16794 rec.radio.amateur.misc:106882 rec.radio.swap:73133


                      *** Mid Atlantic VHF Conference ***

The 20th Annual Mid-Atlantic States VHF Conference sponsored by the Mt. Airy
VHF Radio Club will be held on Saturday, 5 October at the Days Inn in Horsham
PA. Technical presentations relating to VHF/UHF/SHF weak signal operating
will begin at 9AM.

The Days Inn is located just north of exit 27 (Willow Grove exit) of the PA
Turnpike, just north of Philadelphia, in Horsham, PA. Rooms at the Days Inn
can be reserved by calling 215-674-2500. Mention Pack Rats for a discount.
The Days Inn is filling up quickly, so reserve soon. Additional lodging is
available in the Horsham area: Holiday Inn Trevose [phone],  Marriott
Willow Grove  [phone], Hampton Inn Willow Grove (215)  659  - 3535,
Warrington Inn  [phone].


                               *** HAMARAMA ***

On the following day, Sunday 6 Oct. the Packrats will have their annual hamfes
t
at the Bucks County Drive In Theater, about 5 miles north of PA Tpk. exit 27
on Rte. 611. Talk-in on 146.52 simplex and the club repeater on 224.58.

Ron, WZ1V has placed the flyer for the events, including a preliminary list of
presentations, on the N.E.W.S. Group web page:
            http://uhavax.hartford.edu/~newsvhf/hamarama.html

For  more information on the technical conference or a possible presentation
slot,  contact John Sortor, KB3XG, at 610-584-2489 or at [e-mail].


                      ** Preliminary Conference Agenda **

        SPEAKERS         TOPICS

 KD1DU, Del Schier  - Introduction to 10 GHz Equipment and Operation

 WB6JJN, Jim         -Amateur Satellites:Modes, Bands,& Issues @ VHF thru
                      Microwaves

 AJ3K, Jim Rautio, Sonnet Software - 3-D Planer Electromagnetic Design

 WA1YHO, Gary Dallas - Using YO & AO to Optimize a 6M Antenna System

 N1DPM                -Introduction to VHF/UHF Weak Signal Operating

 Harvey Kaylie, Mini-Circuits Laboratories

 WB2SON, Richard Fiore - American Technical Ceramics

 W3ZZ, Gene Zimmerman - 40 Years of Contesting

Preliminary schedule of events:

        Friday, October 4, 1996
        5pm to 11pm - Out of town guests arrive, check in.
                      The 2 meeting rooms  be used as a hospitality suite.
              The Pack Rats will provide snacks & beverages

 Saturday, October 5, 1996

        9am to 12pm  Morning conference session.
       12pm to  1pm  Lunch break
        1pm to  5pm  Afternoon conference session.
        5pm to  7pm  Hospitality suite.
        7pm to  9pm  Dinner/Banquet
        9pm to 11pm  Hospitality suite.

Sunday, October 6, 1996

       6am to 10am   Check out
       7am to  3pm   Hamarama at the Bucks County Drive In

73!
W3IIT & AA3GN
--
[e-mail] - speaking only for myself, of course
No, this is not a sig.


From [e-mail] Fri Sep 27 21:57:28 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew
Subject: Re: Morse Code again (was Re: re: do we build?  was(re: arrl survey ignores 7 of 8 wrc-99 issues!)
Date: 20 Sep 1996 00:18:14 GMT
Organization: American Information Systems, Inc.
Lines: 40
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In <51p2v7$[e-mail]>, Ed Hare <[e-mail]> writes:
>
>It is my personal opinion that Morse Code is important to the Amateur
>Radio Service for a number of reasons.  The most important is that it is
>apparently important to a significant number (significant is not
>necessarily defined as a majority) of us.  The alternatives proposed are
>important to a significant number of us, too, so those who are proposing
>solutions that do not consider the needs or wishes of others with
>alternative views are proposing solutions that are more divisive than
>useful.
>

So the code should be forced down everyone's throats, because SOME
SEGMENT of the ham community views it as "important" (to them).

That makes ZERO sense, Ed ... how would the CW folks like it if the
digital folks forced a test in coding software algorithms for DSP on
them?  After all, those skills are *important* to a(n ever-growing)
group of hams ...

Sounds like a *practical* test to me ... write some software routines
that implement an FFT, a Hilbert transform, do some digital modulation
and demodulation, complex filtering, etc.  ...  maybe even implement
some convolutional codes and a Viterbi decoder or two ...  Would the CW
folks find this an appropriate *pass/fail* test element?  (If not, WHY?)

I would submit that jaming things that they don't consider relevant down
people's throats will *always* generate some "devisive" feelings on the
part of the "jamee" ...  yet that's what the code folks have been doing
to everyone for years and years ...  and we're sick and tired of it ...
to quote "Network" ... "We're mad as hell and we're not going to take it
any more!"

If that's "devisive," so be it ... I guess we need some "dividing" ...
it's not always bad to stir things up a bit ... unless all you care
about is maintaining the status quo at all costs ...

Carl - wa6vse
[e-mail]



From [e-mail] Fri Sep 27 21:57:30 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!news2.amd.com!txnntp.amd.com!usenet
From: Chris Broadbent <[e-mail]>
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew
Subject: Re: Morse Code again (was Re: re: do we build?  was(re: arrl survey ignores 7 of 8 wrc-99 issues!)
Date: Mon, 23 Sep 1996 14:53:01 -0500
Organization: AMD
Lines: 42
Message-ID: <[e-mail]>
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[e-mail] wrote:
>
> ...<SNIP>
>
> .... And  for the "Try CW, You'll
> learn to love it!" group, I say "Nuts to you." I worked on that damn
> Morse Code until it made me sick. It's still just noise to me. Now I'm
> forever locked out of the HF spectrum because of this discriminatory
> rule.
> Butch N2YMJ

Yes, there is a homebrew aspect to this response further down....

And what if, try as you might, you couldn't get the technical aspects of the
tests right (many people can't)?  Would you cry "discrimination" because,
after all, why do you need to know what thosed damned transistor squiggles
and Ohm's law thingies are?  Only homebrewers need to know these things, not
appliance operators.  Who needs to know how an engine works to drive a car,
after all?  Why do you have to understand the components of a phase
modulated TX when all you ever intend to do is key the mike on your Yeasu
wonderradio?

I could make as big a case for removing most of the technical requirements
as you are making for the removal of the code requirement.  If successful,
would we be better Hams?  I don't think so.

Mark my words, if the CW requirement is removed, the technical requirement
will follow.  That would be a sad day.

And before anyone cries, "but it's alright for you, you have passed the
tests", I'll point out that I have been a supporter of the code requirement
both before and after writing my tests recently (a quick search using Deja
News will verify this).

Again, I like the homebrew aspects, and there is no simpler homebrew
starting point than a CW TX.  The CW requirement encouraged me to enter, as
I know there are many people out there with whom I can communicate using my
freshly made homebrew TX.  A selfish position, perhaps, but no more selfish
than those who clammer to have the requirement removed because they cannot
pass.

Chris (KC5VQL)


From [e-mail] Fri Sep 27 21:57:31 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!namesrv.mdc.net!usenet
From: [e-mail] (Jim Martin, WK1V)
Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew
Subject: Re: Morse Code again (was Re: re: do we build?  was(re: arrl survey ignores 7 of 8 wrc-99 issues!)
Date: Wed, 25 Sep 1996 02:16:30 GMT
Organization: NetWay By MDC, Inc.
Lines: 43
Message-ID: <529qh9$[e-mail]>
References: <[e-mail]> <[e-mail]> <51p2v7$[e-mail]> <51sns7$[e-mail]> <521e7i$[e-mail]> <523snb$[e-mail]>
Reply-To: [e-mail]
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[e-mail] wrote:

>In <521e7i$[e-mail]>, [e-mail] writes:
>>
>>Well said, Carl. I agree 100%. The trouble is though, things will
>>never change as long as the CW loving ARRL is running the show.BTW, I
>>resigned from that lofty organization last year just because of their
>>assinine stand on code requirements. And  for the "Try CW, You'll
>>learn to love it!" group, I say "Nuts to you." I worked on that damn
>>Morse Code until it made me sick. It's still just noise to me. Now I'm
>>forever locked out of the HF spectrum because of this discriminatory
>>rule.
>>Butch N2YMJ
>>

>Butch,

>Don't give up ... be more vocal ... we WILL get things changed ... and I
>think it will be sooner rather than later ...

>73,
>Carl - wa6vse
>[e-mail]

Well folks the results are in!  After observing the stats of the
downloaded FCC database with which Microsoft Access, Foxpro,
etc...were used we now know that 78%.....I say again 78% of the U.S.
Amateur Radio operator population is of the coded variety.  Only 22%
of the hams are no code technicians.  That is 1/5th.  I think the
numbers of no-coders will have to grow for there to a significant
impact here.

Now, realistically not everyone of that 78% is active...but I bet
neither is the entire 22% of the uncoded population.

What say ye naysayers about that?


===========================================
cheers! Jim Martin, wk1v
Lowell, Mass, U.S.A.
http://www.shore.net/~jjmartin/jjm.htm



From [e-mail] Fri Sep 27 21:57:32 1996
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From: [e-mail] (Kimball Gibson)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Need Help with building a discone
Date: 20 Sep 1996 18:15:12 GMT
Organization: Cal State University Fresno
Lines: 24
Message-ID: <51umvg$[e-mail]>
References: <[e-mail]> <[e-mail]>
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In article <[e-mail]>, [e-mail] says...
>
>In <[e-mail]> "miker in Tigard, OR."
<[e-mail]> writes:
>
>>I want to build a discone for my frg9600.  I thought i'd make
>>it out of .2" dia aluminum rod that's in the junk box.
>
>>The disk and the cone designs are easily determined from
>>engineering handbooks.  But they don't say much about what goes on
>>at the apex of the cone.  Sounds like the cone should go to a point
>>if possible.  But you have to stick a support pipe up the middle.
>
>
There was a good article on building a discone antenna in the Sept. 87
issue of 73 magazine if you can find a copy, I can copy the article if
you need it.  I built this design and it works great.  It was fairly
inexpensive and used brass pipe fittings and brazing rods for elements.
No lathe required, just a decent drill press and taps.  I spray painted
my antenna white after construction to weatherproof it as brazing rod
tends to rust over time.

Kim Gibson, N6JQG



From [e-mail] Fri Sep 27 21:57:33 1996
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From: Trent Howard <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: radar detector local oscilator frequency
Date: Mon, 23 Sep 1996 08:06:57 -0500
Organization: Rockwell International
Lines: 8
Message-ID: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: pc1540.cca.rockwell.com
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I hope this is an appropriate group.
I was wondering what the radar detector local oscilator
is at for a frequency.  I have been trolling for taillights
and I would like a radar detector detector
I think the local oscilator is around 11 gHz or so but I
would like a better number....
thanks
Trent


From [e-mail] Fri Sep 27 21:57:34 1996
Path: news2.epix.net!news3.epix.net!uunet!in2.uu.net!munnari.OZ.AU!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Fabrizio MODINA)
Newsgroups: rec.radio.amateur.homebrew
Subject: Remote Tuner
Date: 25 Sep 96 18:13:25 GMT
Organization: ucsd usenet gateway
Lines: 12
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

I am looking for schematics of remote tuner for HF operation (160-10m) as
to SGC 230 or others.
Thanks.

73 de IK1VCF Fabrizio

[e-mail]







From [e-mail] Fri Sep 27 21:57:34 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Repairing Vertical
Date: Thu, 19 Sep 1996 19:35:32 -0400
Organization: Barrie Connex newsserver
Lines: 9
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <[e-mail]>
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Has anyone out there ever successfullly "spliced" a vertical antenna?
   I had to saw in half the wide aluminum section of an old Hy-Gain
   mulitbander when moving some time ago.  Now I'm intrested in using it
   again.  Can one improvies a kind of mechanical "collar" to put the
two
   peiced back together.  And would it electrically work?

   73 de Geoff, VA3FQA
   [e-mail]


From [e-mail] Fri Sep 27 21:57:36 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Surplus FT-243 crystals  and FM Moitor rec.
Date: Sun, 22 Sep 1996 19:59:54 GMT
Organization: Winthrop Technology
Lines: 30
Message-ID: <[e-mail]>
References: <[e-mail]> <[e-mail]> <51rqlr$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: net40.nw.com.au

>Any crystals in the 7000 to 7300 KHz range fall within the 40m band.

>KC5NG

But not these ones.  See below.

>>I have a box of crystals .. 25 kHZ  difference between crystals,
>>starting at  5700 KHz  to  8625 KHz.  What can they be used for
>>or modified for  The crystals are in FT 243 holders

Most of these older type crystals, NOT being hermetically sealed,
yopu'll find won't even oscillate.  Their fundamental freq's
are often way way down in the approx 500kc range, the rigs
they were used in multiplied them up to the freq stamped on
the crystal.  (Lower freq rock was more rugged, used in tanks,
equip bound to get tossed around a little).

First make sure they oscillate, and besides "rubbering" them
with a small padder, another trick you can use to shift their
freq is to drill and tap a small hole in the middle of the face
plate, use a screw to increase SLIGHTLY the pressure on
the plates over the wafer itself.  But I'm still betting that most
of them will be duds.

Uncle Brian  VK6BQN

   -   -
"The law is like a whore.... as long as you pay it enough
money, you can screw it any way you like."
     "Rotter" in alt.crime


From [e-mail] Fri Sep 27 21:57:37 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!newsfeed.internetmci.com!malgudi.oar.net!hyperion.wright.edu!news.wright.edu!desire.wright.edu!nyoung
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: The Handicapper General & the Morse key of the Oppressed
Date: 24 Sep 96 21:04:54 EST
Organization: Wright State University
Lines: 56
Message-ID: <[e-mail]>
NNTP-Posting-Host: desire.wright.edu

And just to add fuel to the already inflamminatorized
discussion: I've been playing CW since around 1968, when I
got my licence. This was after the USN had told me that I
was gonna be a radio operator but sent me to teletype school
(no cw) instead. So I had to learn the CW the same way many
do: listen and listen and listen and pink rabbits with bad
fists. But I wanted to play HF and I wanted to play DX and
I wanted the damn ticket. So I learned to copy at 5 wpm. Then
I bought a keyer and discovered that I could send at 15 wpm
and copy at 8. So I learned to copy at 17 and passed the
general. Then the advanced. And since it's been a while since
I chased some guy up the warp scale of CW, that's where I is
today: an advanced ticket holder who would, if he could find
the time, study all the transistor squiggles and learn  to
copy cw at 20+ (which I could do back in '72 when I left
the USN).

Actually, it all comes down to something I read once in a
_Playboy_ magazine. (We all read _Playboy_ in the Navy. It
was the only source of good literature and cogent discussion
of current event topics. Yeah, right.) Once some years ago
I came across a story by Kurt Vonnegut. I think I read it in
_Playboy_. The story was called "The Handicapper General."
At least that's what I remember, even if it might just have
been the name of one of the characters. The Handicapper General.

The Handicapper General was a government official who went
around putting weights on the best ballerinas so that none
would be better than an a priori average. Same with speakers:
special dental and tongue implants so that their words would
not sound any better than any other speakers. Clamps and
bondage on the hands of writers. Limited vocabulary and spell-
checkers too. Everyone was averaged out by the Handicapper
General.

So you have a choice: you either get past the basic crap,
the CW or the theory, and you get on with enjoying whatever
part of the hobby you like, be that satellites or QRPp on
1.75 km. You're different. You cared enough to go through the
basic training to get the licence.

Or you can water it down, one way or the other, with no CW
requirements or no technical knowledge requirements and you
end up with CB (or some pandemic equivalent) that has been
averaged out by the Handicapper General.

Me, I'd rather know that my frontal lobe and my ability to
decipher signs and sounds somehow went beyond my natural
ability to control what is to all other animals just food
barks. Simple choice. Signs and significance or gibbering
cacophony.

73
Nils
WB8IJN &c



From [e-mail] Fri Sep 27 21:57:38 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!barney.gvi.net!mv!news.NH.Destek.Net!mozart.jlc.net!news.intersurf.net!news.webspan.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!vixen.cso.uiuc.edu!qualcomm.com!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (Marcus Ramos)
Newsgroups: rec.radio.amateur.homebrew
Subject: Trident TR2400 scanner info
Date: 18 Sep 96 22:27:02 GMT
Organization: ucsd usenet gateway
Lines: 30
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]

Thanks for reding this:

I have a Trident TR2400 handheld scanner that have the following
problem:

- from 500KHz to 1.570GHz it's OK...
- when I set the frequency to 1.570.001 the sensibility falls about
35dB!
- I tried a "CPU reset" as sugested by a U.K. equipment providor,
reprogramed it (and works!) but the 1570 to 2060 MHz SHF band
still with problems.

It's a strange coincidence but one of the "reprograming" procedures
told me to enter some command (i'll not describe all) like this
7 <enter> 1570 <enter> 2060 <enter> 749.265 <up><up>....

It's more or less obvious that we're telling the CPU in wich frequency
range it should use an "up-convertion" procedure, plus any PIN diode
filter switching to allow this 1.57 to 2.06GHz reach the front end!

This equipment is the same Camnis HST-50 or so... please, any mainte-
nance manual, service manual, CPU procedures...will help.

This rig is to be used as a 902/1296 monitor to my homebrewings and
as a GOES/Meteosat receiver at 1691...this is my problem.

Thanks in advance es regards.

Marcus - PY3CRX - Sao Paulo - Brasil
([e-mail])


From [e-mail] Fri Sep 27 21:57:39 1996
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From: Vlad <[e-mail]>
Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew
Subject: Tunnel diodes
Date: 23 Sep 1996 17:18:02 GMT
Organization: Motorola MIMS; CableComm
Lines: 9
Message-ID: <526goa$[e-mail]>
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Looking for tunnel diodes.
Anybody makes them lately ?
Please reply to Vlad at:
[e-mail]

Regards,
Vlad
KB9OLM



From [e-mail] Fri Sep 27 21:57:40 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!news.sgi.com!news-peer.gsl.net!news.gsl.net!news-res.gsl.net!news.gsl.net!portc01.blue.aol.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail
From: [e-mail] (W8JI  Tom)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: Use for broken transformers ?
Date: 23 Sep 1996 20:08:46 -0400
Organization: America Online, Inc. (1-800-827-6364)
Lines: 21
Sender: [e-mail]
Message-ID: <5278qe$[e-mail]>
References: <525i9c$[e-mail]>
NNTP-Posting-Host: newsbf02.mail.aol.com
X-Newsreader: AOL Offline Reader

In article <525i9c$[e-mail]>, [e-mail] (Paul KeinΣnen)
writes:

>
>Inductors that are designed to carry large DC currents usually have an
>air gap to avoid core saturation. Using an ordinary transformer core
>(without an air gap) can have surprising effects if the core saturates
>(generation of harmonics etc.)
>
>Paul OH3LWR
>
>

That's a good point Paul, but if the person stays within the AC current
design limits of that winding (with the peak choke current) the core will
be will be ok.

Another point worth mentioning is that if the transformer fails from
shorted turns, the impedance of other windings is reduced.

73 Tom


From [e-mail] Fri Sep 27 21:57:41 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (William L. Fuqua III)
Newsgroups: rec.radio.amateur.homebrew
Subject: Use for open-filament 8877?
Date: 20 Sep 96 20:36:00 GMT
Organization: ucsd usenet gateway
Lines: 26
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]


>Date: Thu, 19 Sep 1996 05:23:42 GMT
>From: [e-mail] (David Feldman)
>Subject: Use for open-filament 8877?
>
>An amplifier recently purchased arrived with an open filament 8877. Whether
>caused by mishap in transit or other means will probably be a mystery, but
>I'm now wondering what use (if any) can be made of such a tube? Any ideas?
>
>73 Dave WB0GAZ [e-mail]
>
   EIMAC rebuilds some tubes. I don't have the list of tubes that they
rebuild but at least the larger tubes such as the 3CX15,000A7 the
rebuilt one is about half the price. The part number is the
same except that it has an "R" after the normal part number.
    I just checked a couple of weeks ago about this.


73 Bill wa4lav

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





From [e-mail] Fri Sep 27 21:57:42 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!enews.sgi.com!news.sgi.com!news.msfc.nasa.gov!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!agate!newsgate.duke.edu!zombie.ncsc.mil!cs.umd.edu!newsfeed.gsfc.nasa.gov!newsroom.gsfc.nasa.gov!usenet
From: [e-mail] (NR3O, Chris Smith)
Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,rec.radio.amateur.misc.
Subject: VHF Antenna that Looks Like TV Antenna
Date: 23 Sep 1996 13:20:06 GMT
Organization: Hughes Team (EOSDIS)
Lines: 18
Message-ID: <5262q6$[e-mail]>
NNTP-Posting-Host: lo-pc2105.hitc.com
Mime-Version: 1.0
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I am looking for an article that is supposed to be in CQ, I think from
years ago.  Bill Orr's book "Simple, Low-Cost Wire Antennas for Radio
Amateurs" has something called a CIA Special.  This ant is designed to
look like a TV antenna, but is really a 6, 2 and 220 antenna.
It has 2 beams, stacked.  Each beam has a pair of 6 meter dipoles in a vee
shape about 1/4 wave apart.

Anyhow, I got it to work on 6 meters using their suggested tuner design, but I

can't get it to work on 2 (3:1 SWR is best I can do).

I am hoping that whomever told me it was once in CQ Magazine is correct and
that I can get hold of copy of the article to get more info than I have in
the book to get it going on 2 meters.

Any help appreciated!  73 de Chris NR3O

Please respond to email at [e-mail]



From [e-mail] Fri Sep 27 21:57:43 1996
Newsgroups: rec.radio.amateur.homebrew
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!arclight.uoregon.edu!usenet.eel.ufl.edu!spool.mu.edu!newspump.sol.net!www.nntp.primenet.com!nntp.primenet.com!cam-news-hub1.bbnplanet.com!howland.erols.net!EU.net!sun4nl!dataweb.net!Leiden.NL.net!Utrecht.NL.net!news
From: "Joop van der Velden" <[e-mail]>
Subject: Re: Wanted: FOX transmitter design for rocket
X-Nntp-Posting-Host: ehv51-7.eindhoven.nl.net
Content-Type: text/plain; charset=ISO-8859-1
Message-ID: <01bbaae0$673bf740$cefb4fc1@joopv>
Sender: [e-mail] (News at newsutr)
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Mime-Version: 1.0
Date: Wed, 25 Sep 1996 19:50:59 GMT
Lines: 28



Louwers <louwers@stevin> wrote in article <52607l$[e-mail]>...
> Hi there,
>
> I am a fanatic amateur rocket builder. As our rockets get better all the
time,
> we start to get problems in retrieving them.
>
> We think that recovery would be much easier if we had a kind of FOX
> hunting transmitter in it. So we are looking for a _small_ transmitter
> (144 MHz) design for our rockets. Range should be about 5-10 Km's.
>
> Does anyone of you have a good design for such a small transmitter?
Preferably
> with PCB layout. Any help is greatly appreciated.

144 MHz is out of the question - unless you have licensed radio amateurs in
your rocket builders group. Even then, you'll need a special permit i think.
144 MHz is an exclusive amateur band - no other parties allowed.

However, there is a ISM band at 433.920 MHz +/- 0.2% where you can use 10 mW
transmitters. Also on 2450 MHz there is such a piece of spectrum.  Look in
the Conrad catalog for more information about transmitters and receivers for
these frequency's.

Joop



From [e-mail] Fri Sep 27 21:57:44 1996
Path: news2.epix.net!news3.epix.net!uunet!in3.uu.net!newsfeed.internetmci.com!pull-feed.internetmci.com!news.internetMCI.com!news-admin
From: "Richard B. Joerger" <[e-mail]>
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Wanted: Heath HW8 Handbook/mod book
Date: Tue, 24 Sep 1996 13:00:47 -0400
Organization: Racal-Datacom, Inc.
Lines: 15
Message-ID: <[e-mail]>
NNTP-Posting-Host: rdgw.racal.com
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Xref: news2.epix.net rec.radio.amateur.equipment:32510 rec.radio.amateur.homebrew:16810 rec.radio.amateur.misc:106909

Howdee.

I've been looking for a compendium of mods for the Heath HW8 QRP rig.

It's been suggested that I get the book "HW8-Handbook" by the 73
magazine QRP editor. 73 Mag. doesn't have the book.

Can anyone point me to a source OR does anyone have a copy they would
sell?

TIA & 73

Rich Joerger, WB4EHG
[e-mail]
[e-mail]


From [e-mail] Fri Sep 27 21:57:45 1996
Path: news2.epix.net!news3.epix.net!uunet!in2.uu.net!www.nntp.primenet.com!nntp.primenet.com!ddsw1!news.mcs.net!van-bc!news.rmii.com!rainbow.rmi.net!rainbow!jonz
From: [e-mail] (Bea and Marvin Jones)
Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Subject: Re: Wanted: Heath HW8 Handbook/mod book
Followup-To: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc
Date: 24 Sep 1996 20:42:03 GMT
Organization: Rocky Mountain Internet - (800) 900-RMII
Lines: 20
Message-ID: <529h2r$[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: rainbow.rmii.com
X-Newsreader: TIN [version 1.2 PL2]
Xref: news2.epix.net rec.radio.amateur.equipment:32514 rec.radio.amateur.homebrew:16813 rec.radio.amateur.misc:106922

Richard B. Joerger ([e-mail]) wrote:
: Howdee.

: I've been looking for a compendium of mods for the Heath HW8 QRP rig.

: It's been suggested that I get the book "HW8-Handbook" by the 73
: magazine QRP editor. 73 Mag. doesn't have the book.

I noticed in this month's 73 magazine -- classified section -- that
the author has it back in print.  I don't have the magazine with me,
but I believe it is self-published and _not_ in the "73 BookShelf" (or
whatever Wayne calls it.)

If I remember, I'll look for it again and re-post here tomoro.

--
73
Jonesy  W3DHJ
__
SK


From [e-mail] Fri Sep 27 21:57:46 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!howland.erols.net!newsfeed.internetmci.com!in1.uu.net!news.nevada.edu!silver.scs.unr.edu!news.unr.edu!news.sprintlink.net!news-stk-3.sprintlink.net!southwind.net!usenet
From: [e-mail] (Zack Clobes)
Newsgroups: rec.radio.amateur.homebrew,sci.electronics.components
Subject: Re: Wanted: Source for Toroid Cores
Date: 23 Sep 1996 00:53:57 GMT
Organization: SouthWind Internet Access, Inc.
Lines: 31
Message-ID: <524n35$[e-mail]>
References: <523uff$831$[e-mail]>
NNTP-Posting-Host: hut11.southwind.net
Mime-Version: 1.0
Content-Type: Text/Plain; charset=US-ASCII
X-Newsreader: WinVN 0.99.6
Xref: news2.epix.net rec.radio.amateur.homebrew:16798 sci.electronics.components:7436

In article <523uff$831$[e-mail]>,
[e-mail] says...
>
>Can anyone recommend a mail order source for single quantities of
>toroid cores?

I just got an order of cores from Palomar Engineers.  They will send out spec
sheets for free and I don't think they have a minimum order (I ordered about
$30 worth of cores).  I also found a few cores from DC Electronics.  They were

quite a bit cheaper than palomar but they only carried a small selection.
Amidon Associates may be able to help you.  I have some info from them but hav
e
never ordered from them.

Palomar Engineers
PO Box 462222
Escondido, CA 92046
Phone: [phone]
Fax: [phone]

I don't have DC Electronic's info handy tonight..  If you email me, I can find

it for you.

Amidon Associates Inc.
PO Box 25867
Santa Ana, CA 92799
Phone: [phone]
Fax:  [phone]

Gud luck,
Zack, AA0XQ



From [e-mail] Fri Sep 27 21:57:47 1996
Path: news2.epix.net!news3.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!realtime.net!news
From: Charles Wenzel <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: wanted: tunable 300-400MHz tunable power oscilator
Date: Mon, 23 Sep 1996 22:23:42 -0700
Organization: Real/Time Communications Internet customer posting
Lines: 9
Message-ID: <[e-mail]>
References: <[e-mail]>
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How about a Mini-Circuits VCO followed by a MMIC amplifier?  If you would
rather build your own, try a grounded gate oscillator using a U310 JFET.
Place a tuned-circuit in the drain with a small capacitor from the drain
to source (2.2 pF?) and a 100 ohm resistor from the source to ground. The
DC supply is connected to the other end of the inductor - bypass well!
Tune the tank with back-to-back varactors coupled with the smallest
capacitor values that give you sufficient tuning range. Take the output
off the drain through a very small capacitor or tap the inductor at a low
impedance point.


From [e-mail] Fri Sep 27 21:57:48 1996
Path: news2.epix.net!news3.epix.net!uunet!in2.uu.net!nntp.newsfirst.com!nntp.crosslink.net!munnari.OZ.AU!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway
From: [e-mail] (William L. Fuqua III)
Newsgroups: rec.radio.amateur.homebrew
Subject: What happen to Heathkit?
Date: 24 Sep 96 15:41:31 GMT
Organization: ucsd usenet gateway
Lines: 20
Message-ID: <[e-mail]>
NNTP-Posting-Host: mail.ucsd.edu
Originator: [e-mail]



  It is simple. It is cheaper to manufacture something
than make a kit. Even in the old Heathkit catalogs there
were examples of this. There was an All-American 5 tube radio
that was cheaper to buy assembled than in kit form.
  Today we often buy new electronic devices rather than have
them repaired. Often it cost more to repair them than to replace
them.

  73
  Bill


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





From [e-mail] Fri Sep 27 21:57:49 1996
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From: [e-mail] (Jim Weir)
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: What happened to Heathkit anyways?
Date: Fri, 20 Sep 1996 16:08:44 GMT
Organization: RST Engineering
Lines: 54
Message-ID: <51ufmr$[e-mail]>
References: <51rab5$[e-mail]> <51sqci$[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: rst-engr.oro.net
X-Newsreader: Forte Free Agent 1.0.82

[e-mail] (Steven Kerns) shared these priceless pearls of
wisdom:
->Dave,
->Too many HAMs quit building kits, Heathkit went out of business...
->73 Steve N3FTI

->In article <51rab5$[e-mail]>, [e-mail] says...
->>
->>I'm sure this question has been asked, but whenever you look at ham
->>books from 15+ years ago, everyone has always got a heathkit
->>something. Whether it be a transmiters/receivers all the way down to
->>test equipment. So it raises the question, what ever happened to
->>the heathkit co.??

Well...that's not exactly the reason.  Heath was originally a homebuilt
airplane designer that sold a few parts to build airplanes (Heath Parasol
etc.).  After WWII, Ed Heath found hundreds of thousands of oscilloscope
tubes on the surplus market -- not the instruments, just the CRT.  RCA at
the time held the patent on virtually all vacuum tube circuitry, and every
radio manufacturer in the world paid a royalty to RCA for the use of the
vacuum tube patents.

Heath found, and truly so, that if you simply sold PARTS and not completed
radios or instruments, then the final manufacturer of the "radio" was the
one who owed RCA the patent money.  RCA wasn't about to go out to Joe
Belchfire's garage and ding him a dime for putting together an
oscilloscope, so Heath started out life making low-cost test equipment
kits.

Test equipment worked it's way into ham gear, then "hobbyist" equipment,
and finally into mainstream electronics -- tv's, hi-fi, and so on.  It is
when Heath went up with a $100 kit against K-Mart with a $49.95 prebuilt
stereo that they went belly-up.

Look at the last of the H'kit catalogs.  Lots of computer, tv, stereo, and
all the stuff you can buy down at Circuit City for half the price.  Their
ham and test equipment pages went down and down until they were little more
than appendages of the catalog.

I feel honored in that Heath came out with an aircraft clock to compete
with RST's clock about 6 months after we introduced our kit.  I can only
giggle that they used the SAME chip that I used in my clock and made the
SAME inadvertent error in the circuit layout.  Now I'm not saying that I
was copied, but...{;-)

Jim


Jim Weir VP Engineering | You bet your sweet patootie I speak for the
RST Engineering         | company.  If I don't, ain't nobody gonna.
Grass Valley CA 95945   |
http://www.rst-engr.com | AR Adv WB6BHI--FCC 1st phone---Cessna 182A N73CQ
[e-mail]        | Commercial/CFI-Airplane/Glider-A&P-FAA Counselor



From [e-mail] Fri Sep 27 21:57:50 1996
Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!www.nntp.primenet.com!nntp.primenet.com!enews.sgi.com!news.sgi.com!news.msfc.nasa.gov!newsfeed.internetmci.com!news.sprintlink.net!news-peer.sprintlink.net!uunet!in1.uu.net!news.island.net!ham!rs
From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: What happened to Heathkit anyways?
Message-ID: <[e-mail]>
Date: Sat, 21 Sep 96 20:30:37 PDT
References: <51rab5$[e-mail]>
Reply-To: [e-mail]
Distribution: world
Organization: The Curmudgeon's Cottage
Lines: 37

[e-mail] writes:

> I'm sure this question has been asked, but whenever you look at ham
> books from 15+ years ago, everyone has always got a heathkit
> something. Whether it be a transmiters/receivers all the way down to
> test equipment. So it raises the question, what ever happened to
> the heathkit co.?? They obviously made money as well as building a
> name for themselves. Hell I love the way heathkit equipment looks
> (but than again I love the way all old eqipment looks ;>
> If anyone nows the answer I'd be very interested in knowing it.

Well, they basically priced themselves out of the market. Why would you
spend a lot of time building equipment that wasn't as good as stuff you
could buy off the shelf for less?

The reason kits were made in the first place was because hams liked
building them, and minus the labour of assembly, they could be sold
cheaper than ready built items. (And hams were always...errr frugal)

By the 1970's there was no longer any financial advantage in kits.





> 73,
> -David-
> KC5WDR



[e-mail]                             __|
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From [e-mail] Fri Sep 27 21:57:51 1996
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From: [e-mail]
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: What happened to Heathkit anyways?
Date: Mon, 23 Sep 96 00:52:02 GMT
Organization: Baka Engineering Service
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> > I'm sure this question has been asked, but whenever you look at ham
> > books from 15+ years ago, everyone has always got a heathkit
> > something. Whether it be a transmiters/receivers all the way down to
> > test equipment. So it raises the question, what ever happened to
> > the heathkit co.?? They obviously made money as well as building a
> > name for themselves. Hell I love the way heathkit equipment looks
> > (but than again I love the way all old eqipment looks ;>
> > If anyone nows the answer I'd be very interested in knowing it.
>
> Well, they basically priced themselves out of the market. Why would you
> spend a lot of time building equipment that wasn't as good as stuff you
> could buy off the shelf for less?
>
> > 73,
> > -David-
> > KC5WDR

David,
 Financial advantage wasn't the operative word, education was. By building and

aligning your own stuff you LEARNED about how it worked. Problem is that
Americans have gotten lazy and are dumbing down, like it or not. If this wasn'
t
happening rat-shack would not have taken over the market.
 Bill




From [e-mail] Fri Sep 27 21:57:52 1996
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From: Gary Tait <[e-mail]>
Newsgroups: rec.radio.amateur.homebrew
Subject: Re: what is the "call" channel?
Date: Fri, 20 Sep 1996 11:30:22 -0400
Organization: Bruce Municipal Telephone System
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On Wed, 18 Sep 1996, David Feldman wrote:

> It's usually a programmed frequency, often that can be scanned "in the
> background" while listening elsewhere (i.e., the radio occasionally
> polls the "call channel" a few times per second looking for activity).
>
> In Japan where all operations are 144-146 MHz simplex, the call channel
> seems to be by default 145.000 MHz.
>
> 73 Dave WB0GAZ [e-mail]

The Call memory may also refer to a memory channel,which is easy to access
with one button press (sometimes it may also be on the mic)

What WB0GAZ described is priority (which could be the same memory channel
os call).

 Gary Tait , VE3VBF