[ARC5] BC-946

[Michael Hanz]

On 1/2/2022 8:53 PM, Waldo Magnuson via ARC5 wrote:
>     Yes, black wrinkle.  Actually it is not a BC-946 but a Navy type CBY-46145, s/n is 1593, so it’s probably an early one.
> Skip W7WGM


Then you need the Navy ARA receiver schematic.  That's not the Signal 
Corps BC-946, which was purchased under an USAAC contract. The ARA 
schematic is attached.

The usual way to match the high impedance to low impedance earphones is 
a transformer with a male phone plug that was intended to bridge the gap 
between high and low impedance equipment deliveries.  The Signal Corps 
was faced with that problem in the last half of the war, and produced 
several variations of the MC-385 (TO-01-1-90 attached.)

I'd be happy to send you one of these gratis if you wish.  Just plug it 
into your phone jack and plug in the headphone into the MC-385. Easy-peasy.

           73,
  - Mike  KC4TOS
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/arc5/attachments/20220102/8a96ce95/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 05.png
Type: image/png
Size: 400 bytes
Desc: not available
URL: <http://mailman.qth.net/pipermail/arc5/attachments/20220102/8a96ce95/attachment-0001.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: ARA CBY-46145 schematic.pdf
Type: application/pdf
Size: 1140742 bytes
Desc: not available
URL: <http://mailman.qth.net/pipermail/arc5/attachments/20220102/8a96ce95/attachment-0001.pdf>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: MC-385 installation.jpg
Type: image/jpeg
Size: 147075 bytes
Desc: not available
URL: <http://mailman.qth.net/pipermail/arc5/attachments/20220102/8a96ce95/attachment-0001.jpg>