[ARC5] Ranger (not Johnson) 209 Aircraft Transmitter
David Stinson
arc5 at ix.netcom.com
Sun Jan 27 20:11:45 EST 2013
(Please note: If the mail lists would allow "blind copy,"
we wouldn't get cross-posting replies. Some do
already, but most don't. Just a suggestion. D.S.)
Hoping someone has a SAMS or anything on the
Electronic Specialty Co. "Ranger" model 209
aircraft transmitter, circa late 1945.
Photo:
http://home.netcom.com/~arc5/Ranger209.jpg
It's a crystal-controlled MOPA design- a 12A6 untuned Pierce
driving an 807 with a 12SG7 mic amplifier feeding P-P 6V6
modultors. But there's this wierd 12J5 triode wired into-
I think- the 807's screen circuit. It's not RF- perhaps
connected in some way to the audio circuits,
but all the wires disappear into a wiring harness.
The 12J5's cathode does not seem to go to ground;
it's connected to a 2.2kOhm resistor which goes to another
bundled wire.
Anyone got a diagram, pretty please?
73 DE Dave AB5S
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