[Milsurplus] BC-1206's, and light aircraft sets.

[Hue Miller]

----- Original Message ----- 
From: "Morrow, Michael A." <mamorrow@tva.gov>

> I've taken a liking to the post-war light aircraft sets, the ones with
> a 200 - 400 and sometimes a 550 - 1500 kc receiver, and a transmitter
> for 3105 (later 3023.5) and sometimes 6210 kc.

There's a tiny Motorola set with an LF receiver and a 1-tube 1-watt
3105 transmitter in one case. Dry battery powered.

> ....The AVT-15 has only two tubes, both 6L6s.  One is the
> modulator, the other is the transmitter.  You'd have thought they'd have
> chosen a pentode that could be configured as an electron-coupled MOPA in one
> tube.  Instead, it's simply a modulated oscillator.  That RF 6L6 must have
> shown some FMing under modulation, even though it was crystal controlled.
> Mike / KK5F

There were several WW2 Japanese aircraft transmitters that used an
807 ( actually more like a 5933 envelope ) in the one-tube transmitter,
modulated by a second 807. These operated in the 2.5-7 MHz range.
I don't think the degreee of FM, while measurable, would be enuff to
be on-the-air noticeable or objectionable. 
Many years back, a high school friend's older brother was using the
Electronics Illustrated officially approved pairing of the Lafayette
HE-30 and the Ameco AC-1 transmitter, one tube xtal oscillator. I was 
appalled when he rigged up an old phonograph amplifier to modulate
the AC-1.  I'd never heard you could do that! But he did, it worked,
and no complaints or tickets.
Hue Miller