A nice, neat old 10M mobile AM transmitter

[LEE BAHR]

Bob:

This transmitter looks like it was built in an E .F. Johnson VFO cabinet. 
Without knowing the dimensions, am not sure, but it looks like it could be 
the case.  I think the front panel was changed to his own panel.  The only 
thing I see countering what I said is the rear panel comes off too.  A 
Johnson VFO cabinet just had the front panel come off as I recall.  I need 
to pull a Johnson VFO out and check to see if I remember correctly.  You 
might check the size vs the size of a Johnson VFO cabinet.

Nice pictures.

Lee, w0vt





----- Original Message ----- 
From: "Robert Groh" <rgroh at SWBELL.NET>
To: <BOATANCHORS at LISTS.TEMPE.GOV>
Sent: Thursday, August 26, 2010 7:26 PM
Subject: A nice, neat old 10M mobile AM transmitter


>I have been doing a bit of general cleanup and organizing in the ham shack 
>and
> found this rather neat old homebrew 10M mobile transmitter which I thought 
> some
> of you might enjoy looking at.  Took some pictures and put them, along 
> with a
> some captions, in an album on Picassa - you can see the pictures here:
>
> http://picasaweb.google.com/bob.groh/Homebrew10MMobileTransmitter?feat=directlink
>
>
> The transmitter is from CQ Magazine, June 1950.  It covers 10M with a 
> built in
> VFO and is AM modulated (using a carbon mike which I have somewhere around
> here).  Tube line up:
> 6AK5  VFO
> 6C4 buffer
> 12AQ5 final
> 6AQ5 modulator
>
> Power requirement is 12 VDC for the tubes and the built in TR relay (uses 
> PTT)
> and 180VDC at 26 mA for the plates. RF power is reportedly 10W (probably 
> power
> input).  The little guy is only 6" in each side - huge in today's world 
> but
> nicely compact back in the day.
>
>
> The transmitter was given to me by Chuck Corteville, W0HDF (SK) several 
> years
> ago.  Not sure who built it but Chuck put his imprint on it in 1958 when 
> he
> modified it for 12 VDC operation. Tucked inside was a copy of the 
> schematic and
> some notes from Chuck.  Very nicely built. Not sure what I will do with 
> it - was
> going to pair it up with a Gonset converter but rather think I have too 
> many
> projects on my plate as it is.
>
>
> Anyways there you go.  If you happen to have a copy of the original 
> construction
> article, I would certainly like to have a copy for keeping with this 
> radio.
>
> 73
> Bob, WA2CKY
>
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