[Milsurplus] TG-5 Telegraph question and part needed

[Richard]

Yes, it's an interesting story.  After the war the British government 
made awards to people who made significant inventions during the war, 
and Captain Fuller got nothing.  They said there were earlier patents, 
etc.  Later captain Fuller became a General, so I suppose that was his 
payback.  I look forward to your writeup on the Chinese 63 set.

Richard, AA1P

On 5/16/20 2:07 PM, Tim wrote:
> Thanks Richard - good stuff on the TG-5.  I need to go back and read 
> up on the Fullerphone..
> I've been working on a little writeup on the Chinese Type 63 wired 
> telegraph set.
> Circa Vietnam war, single wire / ground circuit but uses a vacuum tube.
> http://www.n6cc.com/chicom-type-63-wire-telegraph-set
>
> Tim
> N6CC
>
>
>
> On Sat, May 16, 2020 at 3:43 AM Richard <brunneraa1p at comcast.net 
> <mailto:brunneraa1p at comcast.net>> wrote:
>
>     First a bit of history.  at the beginning of WWI telegraph along the
>     front used standard telegraph equipment, probably 20 to 60 ma line
>     current, over one line and ground return.  The Germans were
>     reading all
>     the telegraph and telephone traffic by ground conduction using two
>     ground rods and the new vacuum tube amplifiers.  They had the whole
>     front covered, with wires running back from the front.  Half way
>     through
>     someone dimly realized our traffic was being read, and the
>     Fullerphone
>     was invented by Captain Fuller.  It used very small currents, as
>     low as
>     microamperes, with filters to round off the rise and fall, which was
>     undetectable by ground conduction.  Our TG-5 and TG-5A came later,
>     using
>     currents as low as 1 to 1.5 ma which is apparently good enough.  TM
>     11-351 Technical Manual for Telegraph Sets TG-5 and TG-5A dated
>     September 22, 1941 says, "Authorized for and used by various units of
>     the Infantry, Field Artillery, Coast Guard Corps, and Signal Corps."
>     They were used with ground return, and also piggybacked on simplex
>     telephone circuits.  FWIW
>
>     Richard, AA1P
>
>     On 5/15/20 10:10 PM, Jack Antonio wrote:
>     > First. Does anyone have a spare BZ-7-N interrupter
>     > out of a TG-5B? It appears that the one in my unit
>     > is utterly dead. Failing a spare, I may have to
>     > build up a little 1kc tone oscillator to take its
>     > place.
>     >
>     > Now for the question.
>     >
>     > I've been playing with my two TG-5s, and am wondering
>     > about their usage.
>     >
>     > What units were assigned these? My thinking is that since
>     > field phone wire had to be run to these units, why not just
>     > issue them an EE-8 field phone? The phone would not require
>     > a trained morse operator.
>     >
>     > Jack Antonio
>     > WA7DIA
>     >
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