[Milsurplus] Fwd: Re: Special phone jack needed for a friends Stinson L-5

[Mike Morrow]

It was pointed out earlier that the receiver in question is NOT a common BC-1206-C.  It is the much less common R-76/ARR-13.  So yes, this receiver is in fact hard to find, compared to a BC-1206-* which can not operate from a 14 vdc supply.  The R-76/ARR-13 requires 14v for filaments and 200 to 265 vdc for B+.  It has a control line in the power cable to the external vibrator supply (RCA AVA-126).  It has a front panel switch to set the antenna, RF, and LO for 278 kHz operation.  The pictures also clearly show a 14v AVR-20-A1.  The AVR-20-A1 has a BFO, but none of these beacon band receivers do.

I suspect that anyone going through the effort and expense of an accurate aircraft restoration will be unlikely to find ham-hacking its original-type radio equipment to be an attractive activity.  :-)

Mike / KK5F

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>I think a BC-1206 and/or its 12 volt version uses a standard 1/4 inch
>plug. Older miltary transmitters used the smaller tip-ring-sleeve plug
>called a PL-68.  Does the airplane have any sort of loop antenna for the
>BC-1206 so you could use it with non-directional beacons?  Otherwise,
>unless someone knows of an old four course radio range, the receiver
>wouldn't be of great usefulness in it's present state. Two ideas come to
>mind.  First, find another BC-1206, they aren't that hard to find, and
>change the coils so it would tune the broadcast band.  Second idea, make
>a small converter you could hide somewhere that would convert a ham band
>to the tuning range of the BC-1206. Does the airplane have an engine
>driven generator? Is it 12 or 24 volts?  I have never seen, ridden, or
>flown an L-5, I would like to. Stinson made some neat and sturdy planes.
>
>      Bruce Gentry, KA2IVY