Subject: GLOWBUGS digest 402

From: [email-masked]
Date: Thu, 2 Jan 1997 22:34:02 -0600 (CST)

GLOWBUGS Digest 402

Topics covered in this issue include:

  1) Re: Hello to all
	by Mike Toneri <[email-masked]>
  2) Re: When I get bigger...
	by [email-masked]
  3) TV-7 tube tester fuse lamp bulb --- what is it?
	by [email-masked]
  4) Vfos and what would YOU do for a good general one?
	by [email-masked]
  5) 22 1/2V batteries: $5
	by [email-masked] (Jeff Duntemann)
  6) Re: Vfos and what would YOU do for a good general one?
	by Bob Roehrig <[email-masked]>
  7) Re: 22 1/2V batteries: $5
	by John Kolb <[email-masked]>
  8) Re: Vfos and what would YOU do for a good general one?
	by Conard Murray <[email-masked]>
  9) Whoopsies on battery voltage
	by [email-masked] (Jeff Duntemann)
 10) Re: Whoopsies on battery voltage
	by [email-masked] (Stacey T Hanrahan)
 11) Re: Vfos and what would YOU do for a good general one?
	by Conard Murray <[email-masked]>
 12) Re: Vfos and what would YOU do for a good general one?
	by Bob Roehrig <[email-masked]>
 13) Re: 22 1/2V batteries: $5
	by [email-masked] (Jeff Duntemann)
 14) Re: Vfos and what would YOU do for a good general one?
	by "Stephen M. Linscott" <[email-masked]>
 15) Re: Vfos and what would YOU do for a good general one?
	by Murray Kelly <[email-masked]>
 16) NC-183 Restoration
	by [email-masked]
 17) Re: Whoopsies on battery voltage
	by Robert Paschal <[email-masked]>
 18) Re: Vfos and what would YOU do for a good general one?
	by "Brian Carling" <[email-masked]>
 19) Re: Vfos and what would YOU do for a good general one?
	by "Brian Carling" <[email-masked]>
 20) Modulation and the Push-Pull Amp
	by Conard Murray <[email-masked]>
 21) Re: Vfos and what would YOU do for a good general one?
	by Conard Murray <[email-masked]>
 22) Re: Schematic needed
	by Doug <[email-masked]>
 23) Re: NC-183 Restoration
	by Bob Roehrig <[email-masked]>
 24) Re: Schematic needed
	by "Brian Carling" <[email-masked]>

----------------------------------------------------------------------

Date: Thu, 2 Jan 1997 09:21:27 -0500 (GMT-0500)
From: Mike Toneri <[email-masked]>
To: [email-masked]
Cc: [email-masked]
Subject: Re: Hello to all
Message-ID: <[email-masked]>

At 03:27 AM 1/2/97 +0000, Brian Carling wrote:
>Hello Mike - good to see you on here.
>
>That is one rig I have never tried, and have never worked anyone on 
>the air using one.
>
>In fact I don't think I have ever worked anyone who was using the old 
>line-powered, transformerless xmtrs!
>
>It should be fun.
>
>I worked a couple of warbly signals during SKN yesterday though. Wow!
>VE3RNN and AA1HB were both wobbulating all over the place but I 
>managed to work them both.
>
>Sometimes I wonder what happens to these older tube rigs when they do 
>that. It sounds like they have a loose or dirty contact in a 
>bandswitch or a variable capacitor contact or something like that!
>Maybe capacitors breaking down, who knows!
>
Hi Brian. Sometimes the crystals are not too good and they will wobble in
frequency when keyed. I did not get to operate SKN this year due to having
to work all night. Maybe next year with the little Johnson Adventurer tx.
73...Mike

***************************************************
Mike & Lynda Toneri    E-mail:   [email-masked]    
***************************************************

------------------------------

Date: Thu, 02 Jan 97 09:02:08 cst
From: [email-masked]
To: [email-masked], [email-masked]
Subject: Re: When I get bigger...
Message-ID: <[email-masked]>

        I think we already have found a few of the likely ones.  Ben 
Hall is the most prominent one over on the BA list.  Ben wasn't even 
born when consumer use of tubes died.  His interest was spurred by his 
grandfather. (Just like me!, but I'm much older).

        Like you, I am doing my part by exposing all 3 kids to the 
joys of radio.  I guess the secret is to start them very young.

Ray Mack
WD5IFS
[email-masked]

----------------------------------------------------------------------
<snip>

>Seriously, anybody have success in getting transistor-era kids 
>interested in tubes?  Or, any of said transistor-era folks here on the 
>list to tell their stories?

>73,
>Mike, KK6GM

------------------------------

Date: Thu, 2 Jan 1997 15:52:55 -0500 (EST)
From: [email-masked]
To: [email-masked]
Cc: [email-masked] ()
Subject: TV-7 tube tester fuse lamp bulb --- what is it?
Message-ID: <[email-masked]>

I have a nice TV-7 tube tester, but alas, no manual.  Can anyone tell me
what the value of that little fuse lamp bulb on the panel is?  It looks
like an ordinary auto dome light, but I am not sure.

Thanks/Bob/NA4G

------------------------------

Date: Thu, 2 Jan 1997 16:51:56 -0500 (EST)
From: [email-masked]
To: [email-masked]
Cc: [email-masked] ()
Subject: Vfos and what would YOU do for a good general one?
Message-ID: <[email-masked]>

Holiday thinkin' an' head bangin' brought me to the conclusion that I need
a good general purpose VFO --- something that would put out maybe half a
watt, and be good for replacing the xtals in any old rig of happenstance.

Requirements:

0.  Must be a glowebugge device.....(:+}}.....

1.  160/80/40/30m output directly, with frequency coverage for all the
    new proposed warc band (that basically means anything between 1.5
    and 12 mhz), via multiplying or heterodyning.

2.  0.5 watt output into a 50 ohm load, with tuning non-critical or with
    a peaking control (single control besides vfo master frequency control).
    It should be possible to loosely couple or adjust coupling to give
    any desired drive for replacing a xtal oscillator.

3.  Power inputs to be 6.3 vac/vdc or 12.6 vac/vdc (depending upon tubes
    or lineup), and 250-300vdc unregulated, so line, external power suppy,
    or dynamotor/vibrator power would work.

4.  Keying to be at the oscillator level with anything from a -30vdc to
    more grid block or a relay to key, for QSK, mandatory.

5.  Size is unimportant, but good general stability is.  It should be
    possible to use the device as a calibrated frequency standard if
    it is not being used as a vfo (but, the use of a detector system
    is not required --- that is what LM's and BC-221's are for).

6.  Exact dial calibration is not required, although, good precision
    dials would be of use.  A 0-1000 dial would be fine, or maybe some
    sort of inexpensive dial drive more precision than a Velvet Vernier.

I have my own pet ideas about how this should be done or mebbee I would do
it, but for the sake of glowebugge discussion, let us hear how YOU would
do it, what tubes you might use, how you might adapt surplus parts, how
you might tackle exotic parts, etc.

One of the reasons for discussing this is to supplement the growing herd
of single tubers with tv rocks in them, for flexibility.

Some of this was discussed back before xmas, but I think it is a worthy
thread to spin around some more.

73/ZUT DE NA4G/Bob UP

------------------------------

Date: Thu, 2 Jan 1997 13:47:54 -0700
From: [email-masked] (Jeff Duntemann)
To: [email-masked]
Subject: 22 1/2V batteries: $5
Message-ID: <[email-masked]>

Hi gang--

In flipping through the latest American Science and Surplus catalog this
afternoon, I see they're offering Burgess #4156 dry B batteries (45V) for $5
each.  Two of these will definitely run a serviceable regen, and one may
work lamely.  (I got a 3V4 regen to work once on 22.5V.)

No idea from the catalog how long these have been sitting around.

Their catalog number for the battery is 25459, shown on page 67 of catalog 100.

American Science and Surplus
3605 Howard Street
Skokie IL 60076

708-982-0870 phone orders
800-934-0722 FAX

I hate to be a grump, but there's not much else of significant value in the
catalog.

--73--

--Jeff Duntemann KG7JF
  Scottsdale, Arizona

------------------------------

Date: Thu, 2 Jan 1997 15:07:00 -0600 (CST)
From: Bob Roehrig <[email-masked]>
To: [email-masked]
Cc: Multiple recipients of list <[email-masked]>
Subject: Re: Vfos and what would YOU do for a good general one?
Message-ID: <[email-masked]>

On Thu, 2 Jan 1997 [email-masked] wrote:

> Holiday thinkin' an' head bangin' brought me to the conclusion that I need
> a good general purpose VFO --- something that would put out maybe half a
> watt, and be good for replacing the xtals in any old rig of happenstance.

I think I would have the VFO on one frequency range only and hetrodyne to
whatever is needed. Probably use the famous 5-5.5 VFO. From what I have
seen (for example the Heath VF-1) one of the major sources of instability
is poor bandswitching methods in the variable osc stage itself.

For a dial, I would prefer one of the NAtional PW dials. Another good dial
is the micrometer dial such as used in the Lampkin freq meters (I made a
VFO out of one of those and it's fantastic)!

        E-mail [email-masked]           73 de Bob, K9EUI
            CIS: Data / Telecom   Aurora University, Aurora, IL
                      630-844-4898  Fax 630-844-5530

------------------------------

Date: Thu, 2 Jan 1997 13:10:45 -0800 (PST)
From: John Kolb <[email-masked]>
To: Jeff Duntemann <[email-masked]>
Subject: Re: 22 1/2V batteries: $5
Message-ID: <[email-masked]>

On Thu, 2 Jan 1997, Jeff Duntemann wrote:

> Their catalog number for the battery is 25459, shown on page 67 of catalog 100.
> 
> American Science and Surplus
> 3605 Howard Street
> Skokie IL 60076
> 
> 708-982-0870 phone orders
> 800-934-0722 FAX
> 

The area code 708 has been changed to 847. Getting past that, I
found their automated phone system catalog ordering mailbox
was full and not acdepting entries.

John

------------------------------

Date: Thu, 02 Jan 1997 15:29:49 -0500
From: Conard Murray <[email-masked]>
To: [email-masked],
Subject: Re: Vfos and what would YOU do for a good general one?
Message-ID: <[email-masked]>

Hi Bob and the group,
I am in need of the same sort of device. 
I definitely think heterodyne mixing is the way to go. 
Lots less chirp with VFO on a different frequency than the transmitter is
on! My first impulse is to key the xtal and let the VFO run, but the
different xtals for each band might cause keying problems ... especially on
the higher-frequency ones. The problem is trying to pick VFO and xtal
frequencies that won't cause mixing products that will blow through the
output filter while getting output on 160/80/40 and 30. 
Harmonic operation may have to be used on a band or two and some bands might
tune backwards too. 
The biggest thorn I see is 30 meter coverage. The 5 MHz VFO is a good choice
for the 'old' bands, but 30 meter coverage would be a problem unless the VFO
was used at 2X it's frequency for that band .... and that would require the
VFO to be keyed ... which is no real problem either.
Looks like we have a real challenge here folks ... 
73 de Conard WS4S

.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.
. Conard Murray  WS4S    Glowbugs listowner .
.  217 Dyer Avenue        [email-masked]  .
.   Cookeville, TN  38501  615-526-4093     .
.    <><  Wise men still seek Him  <><      .
.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.

------------------------------

Date: Thu, 2 Jan 1997 14:47:50 -0700
From: [email-masked] (Jeff Duntemann)
To: [email-masked]
Subject: Whoopsies on battery voltage
Message-ID: <[email-masked]>

In my last posting I mis-typed the voltage of the Burgess dry battery being
sold by American Science and Surplus.  It's supposed to be 22 1/2V.  Perhaps
due to wishful thinking I listed it as 45V.

I usually make more sense than that, sigh.

--73--

--Jeff Duntemann KG7JF
  Scottsdale, Arizona

------------------------------

Date: Thu, 2 Jan 1997 15:09:48 MST
From: [email-masked] (Stacey T Hanrahan)
To: [email-masked]
Cc: [email-masked]
Subject: Re: Whoopsies on battery voltage
Message-ID: <[email-masked]>

On Thu, 2 Jan 1997 15:48:54 -0600 (CST) [email-masked] (Jeff
Duntemann) writes:

>In my last posting I mis-typed the voltage of the Burgess dry battery 
>being sold by American Science and Surplus.  It's supposed to be 22
1/2V.  
>Perhaps due to wishful thinking I listed it as 45V.
>
>I usually make more sense than that, sigh.

Two of them comes to 45V...   :)

>--73--
>--Jeff Duntemann KG7JF
>  Scottsdale, Arizona

Warm temps today here in the Northland (Montana)...  Came
from outside, and checked the gauge in the shack, it is now
35 above....  At least Mother Nature gave us the keys out of
the "cold storage".

Stacey, AA7YA
A very WHITE, Whitetail, Montana

------------------------------

Date: Thu, 02 Jan 1997 16:30:47 -0500
From: Conard Murray <[email-masked]>
To: [email-masked]
Cc: [email-masked]
Subject: Re: Vfos and what would YOU do for a good general one?
Message-ID: <[email-masked]>

At 05:58 PM 1/2/97 -0800, Steve Ellington wrote:
>What about a vfo with two small, fast reed relays in the output? One
>would break the output when the key is up and the other would short the
>output to ground when the key is up. The preceeding stages could be
>biased so as to cut off with no osc input. 
>
>This method would allow the osc. to run constantly and hopefully,
>shorting the output would prevent stray radiation. If shielding were
>good enough, one could even use it qsk with no osc. signal pickup in the
>receiver. 
>
>What think ye?
>
>Steve N4LQ
>
Maybe a possibility here, but the relays would have to handle the output
power of the VFO and the VFO would be seeing a drastic load change too. 

Conard 
.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.
. Conard Murray  WS4S    Glowbugs listowner .
.  217 Dyer Avenue        [email-masked]  .
.   Cookeville, TN  38501  615-526-4093     .
.    <><  Wise men still seek Him  <><      .
.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.

------------------------------

Date: Thu, 2 Jan 1997 16:52:17 -0600 (CST)
From: Bob Roehrig <[email-masked]>
To: Conard Murray <[email-masked]>
Cc: Multiple recipients of list <[email-masked]>
Subject: Re: Vfos and what would YOU do for a good general one?
Message-ID: <[email-masked]>

On Thu, 2 Jan 1997, Conard Murray wrote:

> I definitely think heterodyne mixing is the way to go. 
> Lots less chirp with VFO on a different frequency than the transmitter is
> on! My first impulse is to key the xtal and let the VFO run, but the
> different xtals for each band might cause keying problems ... especially on
> the higher-frequency ones.

My first choice would be to key the mixer in a hetrodyne unit, 2nd choice
would be the xtal osc.

        E-mail [email-masked]           73 de Bob, K9EUI
            CIS: Data / Telecom   Aurora University, Aurora, IL
                      630-844-4898  Fax 630-844-5530

------------------------------

Date: Thu, 2 Jan 1997 16:52:20 -0700
From: [email-masked] (Jeff Duntemann)
To: Sandy W5TVW <[email-masked]>
Cc: [email-masked]
Subject: Re: 22 1/2V batteries: $5
Message-ID: <[email-masked]>

>>In flipping through the latest American Science and Surplus catalog this
>>afternoon, I see they're offering Burgess #4156 dry B batteries (45V) for $5
>>each.  Two of these will definitely run a serviceable regen, and one may
>>work lamely.  (I got a 3V4 regen to work once on 22.5V.)

>        What size are they?  Small or large or ???

Hard to tell from a crude catalog drawing, but I would guess about 2" X 2" X
4", with binding-post terminals on top.

--73--

--Jeff Duntemann KG7JF
  Scottsdale, Arizona

------------------------------

Date: Thu, 2 Jan 1997 17:54:54 -0600 (CST)
From: "Stephen M. Linscott" <[email-masked]>
To: [email-masked]
Subject: Re: Vfos and what would YOU do for a good general one?
Message-ID: <[email-masked]>

Bob - the Franklin VFO is a good one.  There were some articles in QST in 
the early 60's (I think) by a W2 who built his whole CW station from 
scratch.  One of the articles was a Franklin VFO.  I've got copies 
somewhere, if I can find them.  He also had a tube and relay "transmitter 
turner-onner" (he called it), that provided QSK operation.  I'll try to 
find the articles.  BTW, my latest toy is an NCX-5.  A very impressive rig.

                                   73 de W5EGP

                                        - Steve -

******************************************************************
*   Steve Linscott     Divisional Consultant   Natural Sciences  *
*   IS User Services      Rice University       Houston, Texas   *
******************************************************************

------------------------------

Date: Fri, 03 Jan 1997 10:07:22 +1100
From: Murray Kelly <[email-masked]>
To: [email-masked]
Subject: Re: Vfos and what would YOU do for a good general one?
Message-ID: <[email-masked]>

Conard Murray wrote:

> The biggest thorn I see is 30 meter coverage. The 5 MHz VFO is a good choice
> for the 'old' bands, but 30 meter coverage would be a problem unless the VFO
> was used at 2X it's frequency for that band .... and that would require the
> VFO to be keyed ... which is no real problem either.
> Looks like we have a real challenge here folks ...
> 73 de Conard WS4S

Key the doubler?
******************************************************************
*      Murray Kelly vk4aok      [email-masked]     *
*      29 Molonga Ter. / Graceville/ QLD. 4075/ Australia        *
*      ph/fax Intl+ 61 7 3379 3307  mobile 018 071 355           *
******************************************************************

------------------------------

Date: Thu, 2 Jan 1997 19:12:36 -0500
From: [email-masked]
To: [email-masked]
Subject: NC-183 Restoration
Message-ID: <[email-masked]>

Hi All -
My cousin Steve WA0BPU recently gave me an old S38C (he felt guilty because I
let him buy my favorite tube AM/FM stereo about 20 years ago and he won't
return it). I cleaned it up and it was like finding Raquel Welch face down in
a mud puddle, washing her off, and walla - look what you got !!!! Its pretty
cool. So anyway, that convinces me to retrieve my old NC-183 from the farm
where it has been growing mold since I retired it in 1976 (I bought it used
in 1963 as a lad of 13). This looks like a bit more work! I removed the
insects that had made it home for 20 years, took the cobwebs out, and removed
the mold that completely covered the outside. Raquel Welch she aint - more
like Marylin Chambers ( have you seen her lately? - a bit worse for the wear!
). Anyway - some observations and questions. The pots in this thing were
apparently some "premium grade". They are almost completely sealed - can't
even find a spot to squirt some contact cleaner in to most of them. The old
style hand laced wiring harness is quite a sight to see - that took some
practice and patience! There are lots of capacitors in here! Many are paper
and wax style - should these be replaced out of general principle like the
electrolytics? Curiously, there are quite a few caps that are shown in the
manual picture and the parts list as paper type, but are actually micas in
the radio. Was this type of substitution common? I am sure they are all
originals. What should they be replaced with? Mylars or micas? Or does it
matter? Some of the mica caps that have this bakelite like case material are
cracked apart at the seam - I assume these should go without question.
Another curious feature, is that on the underside of  V9 socket, pin 4, (the
cw oscillator tube), there is a 2 inch long piece of bare copper wire just
sticking out into space. Any ideas what this might be for or why it is there?
Any tips or insights into how I should approach restoring this beast would be
greatly appreciated. The unit is essentially non-functional - there is VERY
little audio and can only hear a few VERY faint signals on 80m. These signals
are strong on my other radios. What about resistors? Do they age gracefully?
A couple show signs of excess heat and will be replaced for sure. Since my
"new" Viking Navigator just showed up today, I am anxious to get this boat
anchor in working condition again. TIA for any suggestions.
Tom Moll N0BS

------------------------------

Date: Fri, 3 Jan 1997 01:09:48 +0000
From: Robert Paschal <[email-masked]>
To: [email-masked]
Cc: [email-masked]
Subject: Re: Whoopsies on battery voltage
Message-ID: <19970103010945.AAA12610@LOCALNAME>

At 09:49 PM 1/2/97 +0000, you wrote:
>In my last posting I mis-typed the voltage of the Burgess dry battery being
>sold by American Science and Surplus.  It's supposed to be 22 1/2V.  Perhaps
>due to wishful thinking I listed it as 45V.
>
>I usually make more sense than that, sigh.
>
>--73--
>
>--Jeff Duntemann KG7JF
>  Scottsdale, Arizona

Jeff, To help you make sense more consistently ---
I'm looking at an ancient (1986) tome here called Complete Turbo Pascal
written by a sage called Jeff who lived in Maryland.  He made quite a bit of
sense except he constently left the "h" out of Paschal. Suggest you read
some of his works and emulate him.

73  Bob Paschal  AA0MC

------------------------------

Date: Thu, 2 Jan 1997 17:27:11 +0000
From: "Brian Carling" <[email-masked]>
To: [email-masked]
Subject: Re: Vfos and what would YOU do for a good general one?
Message-ID: <[email-masked]>

Weeeeell... the Vackar VFO design is out there on the web...

I think the hardest part is getting good stability.

Valve VFOs tend to drift, PERIOD!

Mine needs about a 45 minute warm up before it even begins to get 
stable enough to use on the air! I could show you the circuit 
diagram  from the old Geloso 6CL6-5763 device if anyone is interested.

On  2 Jan 97 at 14:28, [email-masked] chatted merrily:

> Date:          Thu, 2 Jan 1997 14:28:13 -0600 (CST)
> Reply-to:      [email-masked]
> From:          [email-masked]
> To:            Multiple recipients of list <[email-masked]>
> Subject:       Vfos and what would YOU do for a good general one?

> Holiday thinkin' an' head bangin' brought me to the conclusion that I need
> a good general purpose VFO --- something that would put out maybe half a
> watt, and be good for replacing the xtals in any old rig of happenstance.
> 
> Requirements:
> 
> 0.  Must be a glowebugge device.....(:+}}.....
> 
> 1.  160/80/40/30m output directly, with frequency coverage for all the
>     new proposed warc band (that basically means anything between 1.5
>     and 12 mhz), via multiplying or heterodyning.
> 
> 2.  0.5 watt output into a 50 ohm load, with tuning non-critical or with
>     a peaking control (single control besides vfo master frequency control).
>     It should be possible to loosely couple or adjust coupling to give
>     any desired drive for replacing a xtal oscillator.
> 
> 3.  Power inputs to be 6.3 vac/vdc or 12.6 vac/vdc (depending upon tubes
>     or lineup), and 250-300vdc unregulated, so line, external power suppy,
>     or dynamotor/vibrator power would work.
> 
> 4.  Keying to be at the oscillator level with anything from a -30vdc to
>     more grid block or a relay to key, for QSK, mandatory.
> 
> 5.  Size is unimportant, but good general stability is.  It should be
>     possible to use the device as a calibrated frequency standard if
>     it is not being used as a vfo (but, the use of a detector system
>     is not required --- that is what LM's and BC-221's are for).
> 
> 6.  Exact dial calibration is not required, although, good precision
>     dials would be of use.  A 0-1000 dial would be fine, or maybe some
>     sort of inexpensive dial drive more precision than a Velvet Vernier.
> 
> 
> I have my own pet ideas about how this should be done or mebbee I would do
> it, but for the sake of glowebugge discussion, let us hear how YOU would
> do it, what tubes you might use, how you might adapt surplus parts, how
> you might tackle exotic parts, etc.
> 
> One of the reasons for discussing this is to supplement the growing herd
> of single tubers with tv rocks in them, for flexibility.
> 
> Some of this was discussed back before xmas, but I think it is a worthy
> thread to spin around some more.
> 
> 73/ZUT DE NA4G/Bob UP
> 
> 
> 
> 
> 

------------------------------

Date: Thu, 2 Jan 1997 17:30:00 +0000
From: "Brian Carling" <[email-masked]>
To: [email-masked]
Subject: Re: Vfos and what would YOU do for a good general one?
Message-ID: <[email-masked]>

If you key the doubler, then you still have to listen to the VFO as 
soon as you switch to transmit, and you get a LOUD backwave while 
monitoring the keyed signal! I know ... that is what I am doing now - 
keying both the driver and p.a. with a free-running VFO. Not good!

On  2 Jan 97 at 18:18, Murray Kelly chatted merrily:

> Date:          Thu, 2 Jan 1997 18:18:02 -0600 (CST)
> Reply-to:      [email-masked]
> From:          Murray Kelly <[email-masked]>
> To:            Multiple recipients of list <[email-masked]>
> Subject:       Re: Vfos and what would YOU do for a good general one?

> Conard Murray wrote:
> 
> > The biggest thorn I see is 30 meter coverage. The 5 MHz VFO is a good choice
> > for the 'old' bands, but 30 meter coverage would be a problem unless the VFO
> > was used at 2X it's frequency for that band .... and that would require the
> > VFO to be keyed ... which is no real problem either.
> > Looks like we have a real challenge here folks ...
> > 73 de Conard WS4S
> 
> Key the doubler?
> ******************************************************************
> *      Murray Kelly vk4aok      [email-masked]     *
> *      29 Molonga Ter. / Graceville/ QLD. 4075/ Australia        *
> *      ph/fax Intl+ 61 7 3379 3307  mobile 018 071 355           *
> ******************************************************************
> 
> 
********************************************************
*** 73 from Radio AF4K / G3XLQ in Gaithersburg, MD USA *
**  E-mail to:  [email-masked]                         *
*** See the great ham radio resources at:              *
**  http://www.mnsinc.com/bry/                         *
********************************************************

------------------------------

Date: Thu, 02 Jan 1997 19:40:35 -0500
From: Conard Murray <[email-masked]>
To: [email-masked]
Subject: Modulation and the Push-Pull Amp
Message-ID: <[email-masked]>

Hello fellow filament fiends,
I have run across a few statements that seem to contradict each other in my
quest for knowledge about P-P amps.
While reading the manual that came with my R-392, it notes that the P-P
audio amp is resistant to noise from the DC supply line because the noise is
balanced out due to the P-P design. I have also read in the older literature
that one virtue of a P-P amp is that less filtering is required in the power
supply due to the balanced nature of the beast. 
My question is this: if the P-P amp suppresses noise and ripple on the plate
supply line, how do you plate modulate a P-P amp? It seems that the
modulation would be supressed as the ripple and noise are. What's the secret
here?
Thanks,
de Conard WS4S
 
.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.
. Conard Murray  WS4S    Glowbugs listowner .
.  217 Dyer Avenue        [email-masked]  .
.   Cookeville, TN  38501  615-526-4093     .
.    <><  Wise men still seek Him  <><      .
.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.

------------------------------

Date: Thu, 02 Jan 1997 19:53:01 -0500
From: Conard Murray <[email-masked]>
To: [email-masked]
Cc: [email-masked]
Subject: Re: Vfos and what would YOU do for a good general one?
Message-ID: <[email-masked]>

At 07:31 PM 1/2/97 -0600, Bry wrote:
>If you key the doubler, then you still have to listen to the VFO as 
>soon as you switch to transmit, and you get a LOUD backwave while 
>monitoring the keyed signal! I know ... that is what I am doing now - 
>keying both the driver and p.a. with a free-running VFO. Not good!
>
Yup ... that is what I was afraid of. If it was built 'properly' with decent
shielding, then keying the buffer/doubler/mixer would reduce the output to a
low enough level so QSK would be usable. I have seen this work (once) but I
wouldn't  want to design a rig that way. 
73 de Conard WS4S
.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.
. Conard Murray  WS4S    Glowbugs listowner .
.  217 Dyer Avenue        [email-masked]  .
.   Cookeville, TN  38501  615-526-4093     .
.    <><  Wise men still seek Him  <><      .
.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.

------------------------------

Date: Thu, 02 Jan 1997 19:40:59 -0700
From: Doug <[email-masked]>
To: [email-masked]
Subject: Re: Schematic needed
Message-ID: <[email-masked]>

Hi Brain and the bunch...OK...I'll whip up two copies and send one off
to you.  I built the little bugger and had a delegation of two OT's at
my folk's door to talk to me about the finer points of harmonic
suppresion, so I speak about that one from experience.  This little rig
was what got me into ARC-5's...and it wasnt necessarily by choice!

73

Doug, K7YD

Brian Carling wrote:
> 
> Doug, if you would care to make an extra copy of that article and
> mail it to me - I will scan it and put it up for all to see at the
> N6EV web site!
> 
> Brian Carling AF4K
> 18016 Fertile Meadow Court
> Gaithersburg, MD 20877 USA
> 
> On  1 Jan 97 at 23:12, Doug chatted merrily:
> 
> > Date:          Wed, 1 Jan 1997 23:12:41 -0600 (CST)
> > Reply-to:      [email-masked]
> > From:          Doug <[email-masked]>
> > To:            Multiple recipients of list <[email-masked]>
> > Subject:       Re: Schematic needed
> 
> > Hi James...that same project was in the 1950 Handbood, which I have.
> > Not to mention the fact that same rig was my first effort at getting
> > on the air....back in 1960.  So, let me know what your address is and
> > I'll try to get a resonable copy for you...good enough to build it
> > anyhow.  One note of caution....that rig was a real harmonic producer
> > and is link coupled to the antenna...hi impedence feed.  So, unless
> > you want to do a redesign, I'd be carefull how you use it and watch
> > for them sneaky little 'monics.  It's a fun project, uses #18 bell
> > wire for the coils.
> >
> > Let me know...
> >
> > 73
> >
> > Doug Dunn, K7YD
> > Livingston, MT
> >
> > James Janack wrote:
> > >
> > > I was talking with my dad (WA2DWU) a few days ago.  I told him how I
> > > could remember that Christmas of 1956 when I was 9 years old and
> > > received a box of parts that my dad had gathered.  Also how "we" had
> > > assembled all those parts and by New Years Day 1957 had built a one
> > > tube regen receiver.  He had been interested in hamming since the 30's.
> > >  We took our novice exams in Dec '58 (I was 11).  I got WV2DRP.
> > >
> > > Anyway he said the schematic was in "How to become a Radio Amateur."
> > > If my memory serves me, that issue also had a 6V6 XMTR that was
> > > constructed on two wooden slats and used a hand wound coil on some
> > > sticks.
> > >
> > > My dad's birthday is comming up in Feb and I thought it would be fun to
> > > give him the "kit".  I would like get a copy of the schematic or
> > > article.  Anyone out there have an issue of that publication to sell,
> > > or could copy or scan??  I would gladly pay for this.
> > >
> > > Thanks and best wishes to all in '97.
> > >
> > > 73, Jim N2JJ
> > >
> > > [email-masked]
> >
> >
> ********************************************************
> *** 73 from Radio AF4K / G3XLQ in Gaithersburg, MD USA *
> **  E-mail to:  [email-masked]                         *
> *** See the great ham radio resources at:              *
> **  http://www.mnsinc.com/bry/                         *
> ********************************************************

------------------------------

Date: Thu, 2 Jan 1997 21:53:54 -0600 (CST)
From: Bob Roehrig <[email-masked]>
To: [email-masked]
Cc: Multiple recipients of list <[email-masked]>
Subject: Re: NC-183 Restoration
Message-ID: <[email-masked]>

On Thu, 2 Jan 1997 [email-masked] wrote:

> ). Anyway - some observations and questions. The pots in this thing were
> apparently some "premium grade". They are almost completely sealed - can't
> even find a spot to squirt some contact cleaner in to most of them.

I have run across a lot of gear using sealed (mostly Allen Bradley, I
think) pots that were quite noisy. I ended up drilling a small hole
in the back so I could inject cleaner (I do the same thing with those
sealed G.E. / Telechron clock motors).

        E-mail [email-masked]           73 de Bob, K9EUI
            CIS: Data / Telecom   Aurora University, Aurora, IL
                      630-844-4898  Fax 630-844-5530

------------------------------

Date: Thu, 2 Jan 1997 20:30:59 +0000
From: "Brian Carling" <[email-masked]>
To: [email-masked]
Subject: Re: Schematic needed
Message-ID: <[email-masked]>

Related to this - I just found an article on the Internet about 
building an AM transmitter using the 117N7.

There is probably a similar version that could be used on the amateur 
radio bands with ease if someone wants to risk using the power line 
directly and doesn't mind QRP!

It's at:

http://www.accessone.com/~philn/lil7.htm

He's got the schematic, parts list, sources for parts etc.
While intended for the Medium Wave broadcast band, I think you guys 
might like seeing this one - grin!
Enjoy!

On  2 Jan 97 at 20:43, Doug chatted merrily:

> Date:          Thu, 2 Jan 1997 20:43:09 -0600 (CST)
> Reply-to:      [email-masked]
> From:          Doug <[email-masked]>
> To:            Multiple recipients of list <[email-masked]>
> Subject:       Re: Schematic needed

> Hi Brain and the bunch...OK...I'll whip up two copies and send one off
> to you.  I built the little bugger and had a delegation of two OT's at
> my folk's door to talk to me about the finer points of harmonic
> suppresion, so I speak about that one from experience.  This little rig
> was what got me into ARC-5's...and it wasnt necessarily by choice!
> 
> 73
> 
> Doug, K7YD
> 
> 
> Brian Carling wrote:
> > 
> > Doug, if you would care to make an extra copy of that article and
> > mail it to me - I will scan it and put it up for all to see at the
> > N6EV web site!
> > 
> > Brian Carling AF4K
> > 18016 Fertile Meadow Court
> > Gaithersburg, MD 20877 USA
> > 
> > On  1 Jan 97 at 23:12, Doug chatted merrily:
> > 
> > > Date:          Wed, 1 Jan 1997 23:12:41 -0600 (CST)
> > > Reply-to:      [email-masked]
> > > From:          Doug <[email-masked]>
> > > To:            Multiple recipients of list <[email-masked]>
> > > Subject:       Re: Schematic needed
> > 
> > > Hi James...that same project was in the 1950 Handbood, which I have.
> > > Not to mention the fact that same rig was my first effort at getting
> > > on the air....back in 1960.  So, let me know what your address is and
> > > I'll try to get a resonable copy for you...good enough to build it
> > > anyhow.  One note of caution....that rig was a real harmonic producer
> > > and is link coupled to the antenna...hi impedence feed.  So, unless
> > > you want to do a redesign, I'd be carefull how you use it and watch
> > > for them sneaky little 'monics.  It's a fun project, uses #18 bell
> > > wire for the coils.
> > >
> > > Let me know...
> > >
> > > 73
> > >
> > > Doug Dunn, K7YD
> > > Livingston, MT
> > >
> > > James Janack wrote:
> > > >
> > > > I was talking with my dad (WA2DWU) a few days ago.  I told him how I
> > > > could remember that Christmas of 1956 when I was 9 years old and
> > > > received a box of parts that my dad had gathered.  Also how "we" had
> > > > assembled all those parts and by New Years Day 1957 had built a one
> > > > tube regen receiver.  He had been interested in hamming since the 30's.
> > > >  We took our novice exams in Dec '58 (I was 11).  I got WV2DRP.
> > > >
> > > > Anyway he said the schematic was in "How to become a Radio Amateur."
> > > > If my memory serves me, that issue also had a 6V6 XMTR that was
> > > > constructed on two wooden slats and used a hand wound coil on some
> > > > sticks.
> > > >
> > > > My dad's birthday is comming up in Feb and I thought it would be fun to
> > > > give him the "kit".  I would like get a copy of the schematic or
> > > > article.  Anyone out there have an issue of that publication to sell,
> > > > or could copy or scan??  I would gladly pay for this.
> > > >
> > > > Thanks and best wishes to all in '97.
> > > >
> > > > 73, Jim N2JJ
> > > >
> > > > [email-masked]
> > >
> > >
> > ********************************************************
> > *** 73 from Radio AF4K / G3XLQ in Gaithersburg, MD USA *
> > **  E-mail to:  [email-masked]                         *
> > *** See the great ham radio resources at:              *
> > **  http://www.mnsinc.com/bry/                         *
> > ********************************************************
> 
> 
********************************************************
*** 73 from Radio AF4K / G3XLQ in Gaithersburg, MD USA *
**  E-mail to:  [email-masked]                         *
*** See the great ham radio resources at:              *
**  http://www.mnsinc.com/bry/                         *
********************************************************

------------------------------

End of GLOWBUGS Digest 402
**************************