[Milsurplus] is that an oscillator I hear whining?!

Joe Foley [email protected]
Wed, 4 Dec 2002 10:37:25 -0800 (PST)


The T-368's had a MWO to fix that problem but as I
understand it it was because the PTO could be heard in
the nearby receivers, not sure about tracking the
transmitter.  This was used in a land portable van
which would make it an important find for an enemy.

Joe



--- aGEnuine ham <[email protected]> wrote:
> Two comments on this thread.
> 
> 1.  The UK (BPO) used this technique to locate
> entertainment receivers
> which had not had their license fee paid.  LW, MW,
> SW, TV, FM, you name
> it.  May still do so, I haven't heard lately. 
> Wonder how they located
> crystal sets?  Or TRFs, of course.  I believe other
> European countries
> did also, and it would be interesting to learn if
> this technique was used
> before WW2.  I only know of afterwards.
> 
> 2.  In my RCA CR-91 manual, it has a rubber stamp
> marking on the
> schematic next to the antenna terminals which says
> (paraphrasing):
> "WARNING:  Removal of the ground link on the low
> side of the input may
> make oscillator radiation exceed shipboard
> standards".   I always assumed
> this was to reduce receiver interaction on the ship,
> but I wonder if it
> was due to this as well?  Or instead?  After all,
> how many AR-88 type
> receivers would be on one ship?  Later SIGINT ships
> excepted, of course. 
> But, hey, this was something that must have been
> discovered after the
> schematics were printed, but important enough to get
> a rubber stamp made
> and have someone wield it.
> 
> 73,
> George
> W5VPQ
> 
>
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