Subject: GLOWBUGS digest 404

From: [email-masked]
Date: Sat, 4 Jan 1997 13:37:31 -0600 (CST)

GLOWBUGS Digest 404

Topics covered in this issue include:

  1) NC183 Restoration
	by [email-masked]
  2) crystals/sockets
	by Bob Roehrig <[email-masked]>
  3) Re: Radio Handbook by Bill Orr
	by Mike Toneri <[email-masked]>
  4) All Electronics catalog #696 report
	by [email-masked] (Jeff Duntemann)
  5) Re: Vfos and what would YOU do for a good general one?
	by "Brian Carling" <[email-masked]>
  6) Re: Vfos and what would YOU do for a good general one?
	by "Brian Carling" <[email-masked]>
  7) RE: Vfo funzies continued....
	by "Brian Carling" <[email-masked]>
  8) Re: crystals/sockets
	by "Brian Carling" <[email-masked]>
  9) Re: Re[2]: Vfos and what would YOU do for a good general one?
	by "Brian Carling" <[email-masked]>
 10) Re: Radio Handbook by Bill Orr
	by [email-masked] (michael silva)
 11) Re: Radio Handbook by Bill Orr
	by "Joseph L. Hartmann, Jr." <[email-masked]>
 12) RE:Handbook Help
	by Bob Roach <[email-masked]>
 13) 2 tube AM transmitter
	by Jake Hellbach <[email-masked]>
 14) Re: 2 tube AM transmitter
	by Murray Kelly <[email-masked]>
 15) construction
	by [email-masked]
 16) Items for Sale
	by Bob Marsh <[email-masked]>
 17) Re: 2 tube AM transmitter
	by Jake Hellbach <[email-masked]>
 18) Re: 2 tube AM transmitter
	by "Brian Carling" <[email-masked]>
 19) Re: 2 tube AM transmitter
	by "Brian Carling" <[email-masked]>
 20) Items for sale
	by Bob Marsh <[email-masked]>
 21) Re: 2 tube AM transmitter
	by "William L. Fuqua III" <[email-masked]>
 22) 1931 210 TNT Tranmitter
	by Jacqueline Herman <[email-masked]>

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

Date: Fri, 3 Jan 1997 15:00:29 -0500
From: [email-masked]
To: [email-masked]
Subject: NC183 Restoration
Message-ID: <[email-masked]>

Many thanks to all of you who responded to my post. Sorry if I misplaced it
here instead of on BA list, but I knew all the experts here would have the
answers! I appreciate all the great advice, and will hopefully be cooking
soon.
Tom Moll, N0BS

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

Date: Fri, 3 Jan 1997 15:57:19 -0600 (CST)
From: Bob Roehrig <[email-masked]>
To: Boatanchors <[email-masked]>, glowbugs <[email-masked]>
Subject: crystals/sockets
Message-ID: <[email-masked]>

Much discussion on various crystals, holders, and sockets reminded me that
while obvious to many, perhaps some don't know that to fit a HC6/U xtal
into a FT-243 socket (or tube socket) you merely break the pins off an
old octal tube and slip them over the leads of the HC6 xtal.

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

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

Date: Fri, 3 Jan 1997 17:02:30 -0500 (GMT-0500)
From: Mike Toneri <[email-masked]>
To: [email-masked]
Cc: Multiple recipients of list <[email-masked]>
Subject: Re: Radio Handbook by Bill Orr
Message-ID: <[email-masked]>

At 01:35 PM 1/3/97 -0600, Bob Roach wrote:
>Hello Guys,
>
>Just prior to the holidays I went to the local Barnes and Noble book store
>and made out my wish list.  One of the books I wanted was The Radio Handbook
>by Bill Orr.  There was one copy on the shelf.  When the XYL went to shop
>that copy was gone and I ended up with a gift certificate so I called and
>ordered the book.  I just got off the phone with the sales people and they
>told me that the book is unavailable from the distributer and indefinately
>out of stock from the publisher.   I was told that when a book is
>indefinately out of stock it usually means forever.
>
>Does anyone know anything about the status of this publication.  Seems hard
>to believe that after all this time it is no longer going to be published.

I haven't seen a recent copy of The Radio Handbook for several years and I
am not sure if one is still published. I have both the 15th and 16 editions
and they are great reference books and just fun to read through oon a cold
winter's night when the bands are no good. I also have , for you real old
timers out there, a copy of the Radio Engineering Handbook,second edition,
printed in 1935. That is a fascinating book to read. Every once in a while I
find and old technical book at a flea market or book store and add it to the
collection.
73...Mike VE3FGU

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

Date: Fri, 3 Jan 1997 15:35:48 -0700
From: [email-masked] (Jeff Duntemann)
To: [email-masked]
Subject: All Electronics catalog #696 report
Message-ID: <[email-masked]>

Hi gang--

Just got the new All Electronics catalog #696.  (Not to be confused with
Alltronics, separate outfit.) Brief report on items of interest to the crew
here:

Page 19. Tube sockets. Octal for both PCB and solder tab construction.
Phenolic body solder tab sockets $1 each.  (Quantity offer of 100/$80
implies they have a LOT.) Also 7-pin miniature mica body solder tab @ 2/$1,
7 or 9 pin bakelite wafer @ 5/$1.  Also have those 11-pin "octal" style
plugs a Heath owner inquired about on the list recently, for $1.
Page 26. Three different sizes of ground straps with integral end lugs. 6"
and 12". $1.50 - $3 each.
Page 34. 2 watt linear pots, RV4 style, 150, 1K, 3.5K, & 2M ohms. $1.50
each.  Same page: numerous nice knobs for 1/4" shafts.
Page 36. Antique Polyester Capacitors (NOS) Cornell-Dubilier PM and PKM
(Black Cat) capacitors, 30c-45c each, many values, 400-600v
Page 37. Silver micas, 20c-35c each.  Also those high voltage mica caps
discussed on this list a month or so ago.  Also a 1 farad cap the size of a
fat quarter.  Like to take THAT back in time to 1967...
Page 38. 3V 180mAH lithium disk batteries, 10/$10.  Stack 20 in a 1"
diameter plastic tube for a 60V B battery for your regen.  Cost $20 but
180mAH should last you quite awhile, (these cells have a VERY long shelf
life I've heard) and the stack would only be 2" high.  I may try this for my
little 3Q4 regen that's been on the shelf for who knows how many years...
Page 54. Retractable mic cable, 12" retracted, 5' open.  5 conductors, one
shielded.  Neoprene jacket.
Page 54. 6-pin Jones power connector sets, plug and the nice round inset
chassis-mount socket, set for $1.50; 10 sets for $12.50.  I'm getting a few
of these, as it's my standard power supply connector.

That's it.  I've done business with these guys for many years and vouch for
them.

All Electronics
Order line 1-800-826-5432
Order FAX 818-781-2653
Phone 818-904-0524

--73--

--Jeff Duntemann KG7JF
  Scottsdale, Arizona

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

Date: Fri, 3 Jan 1997 16:25:36 +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]>

Bob - would you also need to have a "T-R switch" like the old 6C4 
designs that would let you run QSK? Would something like that be 
required too with such a scheme.

I LIKE QSK a lot and want to work on some scheme like this.
Varactors are easy to get and work with, so it would be easy to do 
the FSK trick,  I am sure.

On  3 Jan 97 at 11:08, [email-masked] chatted merrily:

> > 
> > 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 
> 
> This is a very satisfactory method of CW QSK operation, if you FSK.
> 
> My mentor, N1KW, a fine CW chops of the first water, used to use a
> Collins pto from something (maybe a 32V like thingie since it had
> the square case and the 6SJ7 tube socket --- dunno which pto model
> tho), in this mode, but rather than keying the output keyed it FSK
> and swamped the input with about a 0.0005 capacitor (500pf) to fsk
> it --- key down and the capacitor was out of the circuit and it
> oscillated in the ham bands --- key up and the capacitor was in the
> circuit and it ran down somewhere in the low bcst band.  The
> oscillator ran continuously and the other stages were grid block
> keyed, if I remember right.  The thing would key QSK at 50wpm quite
> perfectly.  I think he was using reed relays, but don't remember for
> sure. That was 22 years ago.
> 
> I was very impressed with the quality of that rig.
> 
> 73/ZUT DE NA4G/Bob UP
> 
> 
********************************************************
*** 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: Fri, 3 Jan 1997 16:25:36 +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]>

On  3 Jan 97 at 9:03, James C. Owen, III chatted merrily:

 There must be 100's of junk Heath's out there if only
> we knew where. 73 Jim K4CGY

You know it would never surprise me if some enterprising sould 
spirited them away to poorer countries over the past 20 years and 
sold many of them there for a good profit.

Just my guess.

As for me, I am planning to go the opposite direction, and try to import some 
English glowbugs/boatanchors in the near future!

Bry, G3XLQ

********************************************************
*** 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: Fri, 3 Jan 1997 16:25:37 +0000
From: "Brian Carling" <[email-masked]>
To: [email-masked]
Subject: RE: Vfo funzies continued....
Message-ID: <[email-masked]>

On  3 Jan 97 at 12:15, James C. Owen, III chatted merrily:

> In message Fri, 3 Jan 1997 11:39:36 -0600 (CST),
>   [email-masked]  writes:
> 
> > I really like that idea of fsking the vfo.
> 
> Once again a job already done for you if you use a Heath SB series
> LMO. There is a terminal used to shift the LMO when you change
> sidebands to keep the operating frequency constant. This terminal
> will shift frequency at least 5 KC maybe more. This should be enough
> to get the frequency away from the operating frequency. 73 Jim K4CGY

Hmmm, I think you need more shift than that if you want to avoid 
having slightly degraded receiver sensitivity!

I guess you could always move it up a bit more though!

********************************************************
*** 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: Fri, 3 Jan 1997 16:25:37 +0000
From: "Brian Carling" <[email-masked]>
To: [email-masked]
Subject: Re: crystals/sockets
Message-ID: <[email-masked]>

GREAT TIP Bob! Thanks!

On  3 Jan 97 at 15:59, Bob Roehrig chatted merrily:

> 
> Much discussion on various crystals, holders, and sockets reminded
> me that while obvious to many, perhaps some don't know that to fit a
> HC6/U xtal into a FT-243 socket (or tube socket) you merely break
> the pins off an old octal tube and slip them over the leads of the
> HC6 xtal.
> 
> 
>         E-mail [email-masked]           73 de Bob, K9EUI
>             CIS: Data / Telecom   Aurora University, Aurora, IL
>                       630-844-4898  Fax 630-844-5530
> 
> 
********************************************************
*** 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: Fri, 3 Jan 1997 16:25:36 +0000
From: "Brian Carling" <[email-masked]>
To: [email-masked]
Subject: Re: Re[2]: Vfos and what would YOU do for a good general one?
Message-ID: <[email-masked]>

This sounds like a great gadget. Is it expensive?

On  3 Jan 97 at 7:21, Cory Hine chatted merrily:

> Guys:
> 
> A thought on stability...  DPK builds a little curcuit that has a
> reference voltage to a varactor, which compensates the drift... 
> Have a couple on order. Will tell you how they work on Collins
> transceivers!  Might solve this decades old problem.  Just a
> thought....
> 
> Cory
> 
> ______________________________ Reply Separator
> _________________________________ Subject: Re: Vfos and what would
> YOU do for a good general one? Author:  [email-masked] at
> smtplink-dl Date:    1/2/97 7:36 PM
> 
> 
> 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
> > 
> > 
> > 
> > 
> > 
> 
> 
********************************************************
*** 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: Fri, 3 Jan 1997 17:51:20 -0800
From: [email-masked] (michael silva)
To: [email-masked]
Subject: Re: Radio Handbook by Bill Orr
Message-ID: <[email-masked]>

You wrote: 
>
>At 01:35 PM 1/3/97 -0600, Bob Roach wrote:
>>Hello Guys,
>>
>>Just prior to the holidays I went to the local Barnes and Noble book 
>>store and made out my wish list.  One of the books I wanted was The 
>>Radio Handbook by Bill Orr.

Bob (I'm responding via the list since I didn't see your message, only 
the reply to it),

I'm sure I saw a copy at the B&N store in Pleasant Hill, CA last night. 
 Try calling them or have your local store call them if you can't turn 
one up.

>I have both the 15th and 16 editions
>and they are great reference books and just fun to read through oon a 
>cold winter's night when the bands are no good. I also have , for you 
>real old timers out there, a copy of the Radio Engineering 
>Handbook,second edition, printed in 1935. That is a fascinating book

Speaking of old radio books, I was lucky enough to find a 1942 ARRL 
Handbook over the Christmas break -- what a kick!  I also found a 1941 
copy of the Radio Engineering Handbook by Henney, 3rd edition, 900+ 
pages.  I already had a copy of this one, but the one I found had an 
inscription that I couldn't resist:  "To Lieut. Raymond Cole from the 
'Radio Gang' and Communications Officers of the U.S.S. Wichita".  To me 
that connects the book directly to a different time and place (I'm 
gonna have to read up on the Wichita's war record) and I grabbed it.  
This makes my other copy (in very good condition) surplus, so I'll sell 
it for what I paid -- $10, plus say $3 for shipping, if anybody is 
interested.

73,
Mike, KK6GM

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

Date: Fri, 3 Jan 1997 22:39:04 -0500 (EST)
From: "Joseph L. Hartmann, Jr." <[email-masked]>
To: michael silva <[email-masked]>
Subject: Re: Radio Handbook by Bill Orr
Message-ID: <Pine.BSD/[email-masked]>

Old radio books:

There is a book dealer in Fitzwilliam, NH who has quite a
collection of old radio books.  The name of the shop is "Rainy
Day Books".  

Rainy Day Books
P.O. Box 775
Fitzwilliam, NH 03447
(603) 585 - 3448

Wow! Why am I advertising the competition??  Maybe it's because
I don't have my stuff on a database, and I spend all my time
reading Internet lists  ??

Best Regards,
 
Joe Hartmann      Tel: (603) 863 6073     
K2AJV -issued     email: [email-masked]   
    1951          home-page: http://www.sugar-river.net/~joeh 
-------------------------------------------------------------
First Student at the:

      Linux Academy in the Sunshine Town of Newport, NH

Thanks to RMS, Linus, and other contributors of free software!
------------- I grant this to the public domain -------------

On Fri, 3 Jan 1997, michael silva wrote:

> You wrote: 
> >
> >At 01:35 PM 1/3/97 -0600, Bob Roach wrote:
> >>Hello Guys,
> >>
> >>Just prior to the holidays I went to the local Barnes and Noble book 
> >>store and made out my wish list.  One of the books I wanted was The 
> >>Radio Handbook by Bill Orr.

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

Date: Sat, 4 Jan 1997 05:26:01 +0000
From: Bob Roach <[email-masked]>
To: [email-masked]
Cc: [email-masked]
Subject: RE:Handbook Help
Message-ID: <19970104052553.AAB13773@LOCALNAME>

Thanks to everyone who offered help and locations where Bill Orr's Radio
Handbook is available.  I was able to locate one about a hundred miles away
which is being ship (free) to the local store for me to purchase with my
gift certificate.

Thanks again

                                                       (o   o)
____________________oOO_(  )_OOo_________
73 es TNX             		
KE4QOK 			Real radios glow in the dark.
Bob			Power is no substitute for skill.
			If it stayed up last winter, it was too small.
136 Hermitage Rd.			
Newport News, Va. 23606	[email-masked]  
(757)930-0348		

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

Date: Fri,  3 Jan 97 23:53 CST
From: Jake Hellbach <[email-masked]>
To: [email-masked]
Subject: 2 tube AM transmitter
Message-ID: <[email-masked]>

Hello to all,
I have just updated my Web page with a Gif of the 2 tube 80 meter AM
transmitter designed by Bob Carter, W6NTU in the 50's. 
Some of the values may be hard to read but I am going to redraw and upload it.
I have a question about the link for the antenna. How many turns does this
need over the tank coil?
It looks like a simple circuit as the 12AT7 is a combination mike amp and
crystal oscillator, and a sweep tube as the final.
I will be building one of these in the very near future and hope to let you
know of the progress.

To go to the schematic of the transmitter go the the "boatanchors" section
in my page and follow the link.

The URL is in my sig. file.

Thanks, Jake KK5HY
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Email via: [email-masked]
A.M. International #832
Check out the Westside ARC Web page at: 
http://www.accesscom.net/~kk5hy
Now updated with boatanchor links!!!!!
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

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

Date: Sat, 04 Jan 1997 23:06:11 +1100
From: Murray Kelly <[email-masked]>
To: [email-masked]
Subject: Re: 2 tube AM transmitter
Message-ID: <[email-masked]>

I see you have 500-1000V on the one half of the 12ax7. Suggest you try
dividing this by 10! 50-100 sounds a bit better.

Jake Hellbach wrote:
> 
> Hello to all,
> I have just updated my Web page with a Gif of the 2 tube 80 meter AM
> transmitter designed by Bob Carter, W6NTU in the 50's.
> Some of the values may be hard to read but I am going to redraw and upload it.
> I have a question about the link for the antenna. How many turns does this
> need over the tank coil?
> It looks like a simple circuit as the 12AT7 is a combination mike amp and
> crystal oscillator, and a sweep tube as the final.
> I will be building one of these in the very near future and hope to let you
> know of the progress.
> 
> To go to the schematic of the transmitter go the the "boatanchors" section
> in my page and follow the link.
> 
> The URL is in my sig. file.
> 
> Thanks, Jake KK5HY
> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> Email via: [email-masked]
> A.M. International #832
> Check out the Westside ARC Web page at:
> http://www.accesscom.net/~kk5hy
> Now updated with boatanchor links!!!!!
> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

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

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

Date: Sat, 4 Jan 1997 09:04:17 -0500
From: [email-masked]
To: [email-masked]
Subject: construction
Message-ID: <[email-masked]>

HELLO GLOWBUGGERS AND HAPPY NEW YEAR

I'd just like to pass on some things I've learned from building a couple of
Bare Essential Xmtrs and the 6T9. Yes I did get both working and they work
fine. The 6T9 is a much better rig with really nice clean tone and keying.
The 6T9 is really a two stage rig with a seperate osc and amp. This is a much
better approach as for as stability and signal quality are concerned. I set
up my 6T9 with band switching for 80, 40 and 30 meters. It works great on all
3 bands, with about 5 to 6 watts out. This may be a little high for my Qrp
operating. The Bare Essentials uses a 50C5 tube as a one stage Xmtr, osc and
amp in one. A couple of things to be very careful with this rig as for as
safety is concerned;
1: it uses no transformer. this is okay as long as you are certain about
which wire at your recaptacle is hot and which is the neutral. In older
houses this can vary from rec. to rec. As an electrician I know this all to
well.
2: for the DC supply (about 330v) the filter cap has no bleeder resistor,
this leaves a potentially fatal charge on this cap for who knows how long
after the thing has been turned off.
3: if built as shown, the tank circuit components all have the DC plate
voltage on them, same danger here.
4: I used an HC49 style xtal, I dont know if  an FT243 would be better but
when built as decribed in the literature the rig chirped and freq hopped
quite a bit. The cure was to lessen the load on the osc/amp by removing turns
from the ant link coil over the tank circuit coil. This lowers the output but
cleans up the signal. It still wasnt real good but okay. I guesstimate output
at about 4-5 watts this way, but it sounded much better.
5: all these items can be easily fixed by the addition of a few parts and
some slight circuit modifications. The origional designer kept the circuit to
a bare minimum of parts as suggested by the title but I think the extra parts
are well worth it for safety's sake.

I think it's fine to go back in time and build some of the old rigs and I
love tubes but we need to make sure that we copy only the good circuits and
techniques. After all we do have hindsight in this case. It's a shame to hear
all those chirpy wide CW signals on the already crowded bands, and it's
almost always a tube type homebrewed rig. I take great pleasure in building
my own equipement, but even greater pleasure in knowing that it puts out a
premium signal. After all, is'nt that what Ham radio is all about?
Excellance!!

I'll get off my soapbox now!

I hope this info helps some, I've learned a lot from this list.

73's
Larry Naumann AA0DM
St. Louis, MO

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

Date: Sat, 04 Jan 1997 09:05:48 -0500
From: Bob Marsh <[email-masked]>
To: Glowbugs List Server <[email-masked]>,
Subject: Items for Sale
Message-ID: <[email-masked]>

Hi All,

I have the following items for sale.  All prices are plus shipping from
ZIP 07006 to your QTH:

1.  Conar Mod. 280 Signal Generator.  170Kc - 60Mc. (10 Lbs) $25.00

2.  AN/URM-25F Signal Generator with new manual. (35-40 Lbs) $135.00
    Has the following accessories:
	2 - Short, 1 long BNC cables.
	1 - DA-109 Dummy Load.
	1 - CU-408 Impedance Matching network.
	1 - Set test leads.
	1 - "N" to BNC adaptor.
    
3.  Johnson Viking Challenger TX With manual copy. (20-25 Lbs) $50.00
    Covers 80, 40, 20, 25, 10 & 6 meters AM/CW.  It loads up on 40 & 80m
(no Xtals for      the other bands).  CW signal has a bit of a chirp in
it.

4.  Hallicrafters Receivers - S-120 & S-118.  (10 Lbs ea)  S-120:
$20.00  S-118: $15.00
    Or both for $30.00.  The S-118 has a broken slug in an IF can, but
has a manual         (such as it is).  The S-120 works but had some dead
spots (probably needs some 
    TLC & an alignment)

5.  FSK-1000 RTTY/ASCII demodulator with copy of manual. (15 Lbs) $25.00

All prices are based on what I've seen posted in various sources.  I'll
entertain any reasonable offer.  If you think the price is too high on a
particular item, let me know why.  I will also consider trades for
Heathkit gear and test equipment.  I'm particularly interested in:

	HD-1410 Keyer
	SB-620 Scanalyzer
	SA-2040 Antenna Tuner
	HM-15 SWR Bridge

Please reply via private E-mail.  Thanks a lot es 73 de Bob/KB2SGM

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

Date: Sat,  4 Jan 97 08:18 CST
From: Jake Hellbach <[email-masked]>
To: [email-masked]
Cc: [email-masked]
Subject: Re: 2 tube AM transmitter
Message-ID: <[email-masked]>

Thanks for the update, any help is more that welcome since I am new to this!

As you see the schematic is as I scanned it from the original, but now that
you mention it the voltage on the plate of the 12AX7 does seem a little
high. I will adjust the schematic.

Thanks again, Jake KK5HY

At 11:06 PM 1/4/97 +1100, you wrote:
>I see you have 500-1000V on the one half of the 12ax7. Suggest you try
>dividing this by 10! 50-100 sounds a bit better.
>
>
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Email via: [email-masked]
A.M. International #832
Check out the Westside ARC Web page at: 
http://www.accesscom.net/~kk5hy
Now updated with boatanchor links!!!!!
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

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

Date: Sat, 4 Jan 1997 06:32:55 +0000
From: "Brian Carling" <[email-masked]>
To: Jake Hellbach <[email-masked]>, [email-masked]
Subject: Re: 2 tube AM transmitter
Message-ID: <[email-masked]>

Jake this is GREAT!
One more wonderful project for all of us tube homebrewers out here!
I am sure that other tubes could be substituted for whatever sweep 
tube you came up with.

I will put up a link to your web site from mine, and now have a good 
number of glowbug projects directly clickable from my pages!

NOW we need a frequency for GLOWBUG AM stations in the day time on 40 
meters.

Propagation on 40m has been excellent lately for small signals, so I 
am sure it would be good for daytime AM on say, 7280 kHz

What about it guys?

On  3 Jan 97 at 23:48, Jake Hellbach chatted merrily:

> Hello to all,
> I have just updated my Web page with a Gif of the 2 tube 80 meter AM
> transmitter designed by Bob Carter, W6NTU in the 50's. Some of the
> values may be hard to read but I am going to redraw and upload it. I
> have a question about the link for the antenna. How many turns does
> this need over the tank coil? It looks like a simple circuit as the
> 12AT7 is a combination mike amp and crystal oscillator, and a sweep
> tube as the final. I will be building one of these in the very near
> future and hope to let you know of the progress.
> 
> To go to the schematic of the transmitter go the the "boatanchors"
> section in my page and follow the link.
> 
> The URL is in my sig. file.
> 
> Thanks, Jake KK5HY
> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> Email via: [email-masked]
> A.M. International #832
> Check out the Westside ARC Web page at: 
> http://www.accesscom.net/~kk5hy
> Now updated with boatanchor links!!!!!
> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> 
> 
********************************************************
*** 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: Sat, 4 Jan 1997 06:39:25 +0000
From: "Brian Carling" <[email-masked]>
To: [email-masked]
Subject: Re: 2 tube AM transmitter
Message-ID: <[email-masked]>

On  4 Jan 97 at 7:10, Murray Kelly chatted merrily to Jake KK5HY:

> I see you have 500-1000V on the one half of the 12ax7. Suggest you
> try dividing this by 10! 50-100 sounds a bit better.

Wow, really, let me take a look....

Yowza, he sure does! Well, I think 250V would be more reasonable to 
get enough OOMPH! to drive the screen on that sweep tube up to some 
reasonable percentage of modulation.

HOW do you set your % mod on a TX like that if you don't possess a
monitor scope or modulation meter and get it anywhere clos eto 100% 
mod.? Listen to thesignal and minimize distortion/maximize audio?
Sounds risky? But looks like a VERY enjoyable project!

BTW - We could make a group buy of xtals for this rig, guys. What freq. 
would anyone suggest?
********************************************************
*** 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: Sat, 04 Jan 1997 13:09:17 -0500
From: Bob Marsh <[email-masked]>
To: Glowbugs List Server <[email-masked]>,
Subject: Items for sale
Message-ID: <[email-masked]>

Hi everyone,

The Johnson Challenger and URM-25 have been sold.  Both went almost
immediately.  I still have a few items left, though:

1.  Conar Mod. 280 Signal Generator.  170Kc - 60Mc. (10 Lbs) $25.00

2.  Hallicrafters Receivers - S-120 & S-118.  (10 Lbs ea) 
S-120:$20.00     S-118: $15.00  Or both for $30.00.  The S-118 has a
broken slug in      an IF can, but has a manual (such as it is).  The
S-120 works but       had some dead spots (probably needs some TLC & an
alignment)

3.  FSK-1000 RTTY/ASCII demodulator with copy of manual. (15 Lbs) $25.00

I'm also looking for Heathkit gear, especially test equipment.  Contact
me if you have something to trade.

Tnx es 73 de Bob/KB2SGM

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

Date: Sat, 4 Jan 1997 14:30:40 -0500 (EST)
From: "William L. Fuqua III" <[email-masked]>
To: [email-masked]
Subject: Re: 2 tube AM transmitter
Message-ID: <[email-masked]>

  I think I see how the circuit is supposed to work.
All the AF voltage gain comes from the step up transformer and
the triode is used as an cathode follower. The cathode resistor is
set to get a screen voltage of about  250 volts and if you had
500 volts on the plate of the modulator you would have about
250 volts plate-cathode voltage. I suggest it not be used with more
than 500 V B+ on either the modulator or the PA.
  You would adjust the cathode resistor for a reasonable PA 
plate dissipation and adjust modulation level by distance from 
microphone.  Don't forget to replace the battery for the
microphone frequently and have a switch is series with it so it is only
used while transmitting.
  The audio choke should be a RF choke. Otherwise it would not 
provide any modulation current to the PA screen. Unless the
choke and screen bypass values are such that they act as a
low pass filter to limit the audio bandwith to about 4 KHz or so. 
  This circuit may work with these few changes.
However the plate dissipation on the 12ax7 may be a bit much depending
on the screen current. It's filaments may not be the only elements
glowing. Also I'd prefer seeing a pentode in the oscillator circuit.
  It would be nice for some one to try the circuit to honor the SK's
contribution to the service.
 73
Bill wa4lav

  William L. Fuqua III  P.E.  E-mail [email-masked]  Phone (606) 257-4155
  Department of Physics and Astronomy      CP-177 Chem. Phys. Bldg.  
  University of Kentucky ,                 Lexington, Ky 40506-0055

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

Date: Sat, 4 Jan 1997 11:38:33 -0800 (PST)
From: Jacqueline Herman <[email-masked]>
To: [email-masked]
Subject: 1931 210 TNT Tranmitter
Message-ID: <[email-masked]>

Hi Gang,
I just came across the January '73 issue of CQ Magazine - in it is an
article titled "A Strictly Modern 210 TNT Transmitter For 80 Meters".
The author has built it on a varnished breadboard - really a thing of
beauty! I'd like to photo copy the article and send it to someone 
who has the ability to scan it into our archives (Bob? Bry?).

The builder has used copper tubing for the inductors, connections
to xmtr are via Fahnestock clips, and the tank coil sits on porcelain
standoff insulators. It's so pretty!

Who ever wants to scan this project please send me your postal address.

73 from flooded Nevada,
Jeff KH2PZ / 7

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

End of GLOWBUGS Digest 404
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