[Milsurplus] SCR-300 Aircraft Radio

[Mike Morrow]

Hue wrote:

>...dashboard with the 2 receivers ARR-13 (BC-1206 / Setchell
>Carlson 524 ) ...

The R-76/ARR-13 is an earlier radio than the 28 vdc BC-1206-C/Model 524.  The ARR-13 is the Setchell Carlson Model 512, and it requires 14 vdc for filaments and a separate HV B+ supply.  It has a button for selecting the 278 kc tower frequency that the 524 lacks.  I wonder how the 512 got a JAN name but the 524 did not.

>... i speculated the L-5 never had a transmitter. I do not know this
> for a fact. 

I thought most of these military Stinsons used the AVR-20 with either the AVT-112/AVA-126, or the earlier AVT-15 (which has a built-in vibrator supply).

With regard to using a ground FM set in aircraft, the post-WWII manuals for the A.R.C. Type 12 gear usually have a system wiring diagram that shows a VHF receiver (R-15), VHF transmitters (T-11, T-13), LF/MF beacon set (R-11), and a control box (C-37) which not only controls the A.R.C. type 12 gear but also an SCR-619 (BC-1335).  I wonder how that worked, since the BC-1335 has no squelch.  The BC-1335 is a pretty neat set except for that.  It must have been a pain to listen to for the duration of a flight.  At least the BC-1000 had squelch.

Mike / KK5F