[NJARC] Repair Clinic

[Jim Whartenby]

Looking foreword to reading about this in the Broadcaster!
You did take some pictures?
Jim
--- Robert Flory <robandpj at earthlink.net> wrote:

> Visit our web site - See http://www.njarc.org
> _______________________________________________
> Hi All,
> 
> I missed the repair clinic on Saturday, but I have a good excuse.  I
> was
> doing a repair clinic of my own.
> 
> With Chris Nardi, curator, I resurrected an RCA-built  WWII Navy TBS
> set,
> VHF AM, on battleship MASSACHUSETTS.
> 
> I started as most repairs do, with a recap of the receiver.  At that
> point
> it responded well to the output of an LP signal generator.  I then
> pushed
> START on the transmitter with no response.  Reseating the
> transmitter, I
> pushed start again, and the motor-generator came to life.  I shut
> down and
> a massive hunt for a transmitter crystal followed.  We found a couple
> much
> later, after giving up the search.  I installed one, pushed start,
> and
> after warming up, hit the test key.  NADA.  Since there was no sign
> of
> response to any tuning control, I started at the oscillator,
> reseating the
> 807 tube and swapping for the other crystal.  BINGO!  She tuned all
> the way
> through and made an Amp of antenna current into a 50 ohm dummy load. 
> 
> 
> Chris went above to try some of the remote controls and found one
> that
> activated the transmitter.  On plugging in a handset, he made some
> test
> transmissions.  I could see the plate current dropping, so I could
> tell he
> was modulating it.  I then had to fix an RBK receiver so we could
> hear the
> transmitter, as the transmitter crystal that worked was on a
> different
> frequency than the receiver.  Heard intelligible signals from the
> transmitter, declared victory, and retreated.
> 
> That's the meat of the story.  I also activated TAJ and TBM
> transmitters,
> and RBA, RBB, RBC receivers on 500, 3570, and 3885kc.
> 
> Rob Flory
> robandpj at earthlink.net
> www.home.earthlink.net/~navyradio  WWII Navy Radio
> www.home.earthlink.net/~robandpj    Les Flory Television and
> Electronics
> 
> 
> 
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