[ARC5] J-22 to MD-7 lash up

[David Stinson]

----- Original Message ----- 
From: "Tom Bridgers" <tarheel6 at msn.com>
> Any chance you'd be willing to share the circuit and type 
> switches you used to make the modified J-22 Function as a C-29?

Howdy, Tom.
No modification.  The MD-7 has an extra, 8-pin
connector not present on the BC-456 which is
specifically for connection of  the J-16 or J-22
box. which provides headphone and mike jacks
for the ARC-5.

In many later-war Navy aircraft like the F4U,
the controls that were originally in the C-29
were instead wired to a switch or switches
in a custom-made console panel, usually mounted
with other panels on the right-hand side of
the cockpit.  I have some photos here somewhere
but can't put my hand on them at the moment.
Don't waste time with Googleing the F4U
cockpit;  almost everything you'll find will be
some ah-hem "restoration" with lots of modern
junk and nonsense shoe-horned into that
panel and the original technology probably
thrown in the scrap heap.  Bleech!
If I wanted to see a Cessna cockpit, I'd look
in a Cessna.  Maybe people should just
paint a Cessna like an F4U and be done.
It's cheaper.

Anyways- the Radio Mechanics would typically
hard-wire the mode for AM, since CW use
was not intended.  Then you just need a single-
pole, 4-throw rotary for transmiter selection if
you are talking an full 4-TX HF installation,
which I think one would be hard-pressed to
find in actual service.  On-Off was the "RADIO"
switch on the Master Power Panel.

On mine, I dispensed with sidetone and TONE
modes, which allowed me to use a 4-pole
triple-throw rotary switch to make CW-OFF-AM.
https://goo.gl/photos/iWWTirSBFGmPEGe77
If you look a the C-29 schematic, you'll see how
you can wire-up switches to provide the functions
you want.
https://goo.gl/photos/5Dbbxpo8uZtYnw3s7
Since my set is a "Single-Single," I don't need
a Transmitter Select switch.
The "NET" switch just opens the Muting circuit
so I can net the transmitter and receiver.

73 Dave S.