[ARC5] Setchell-Carlson Model 512 ... Not a BC-1206-*

[Mike Morrow]

>  ...the 512 one I have I cannot get working..to be fair they work way down
>  from 28v and the single supply is very handy...

If, by "the 512" you refer to the Setchell-Carlson Model 512, the reason you
can't get it working is because it does not operate from a 28 vdc supply...
it need real B+ and 12-vdc!

The Model 512 is known under the JAN nomenclature of R-76/ARR-13.  It requires
12 vdc for filaments, and a B+ supply **up to 250 vdc**.  It was intended to
be used on military light aircraft with 12 vdc systems that employed the RCA
AVR-20-A1 MF/HF receiver, the AVT-112 MF/HF transmitter, and the AVA-126 vibrator
supply.  The R-76/ARR-13 uses that same AVA-126 for its B+ supply.  This added
beacon band coverage that the AVR-20-A1 did not provide from a unit that was
smaller and better performing than RCA's AVR-15 beacon band receiver (which
is the same size as the AVR-20-A1, but lacks an RF stage that the R-76 has).

Mike / KK5F