[Milsurplus] BC-AR-430 Transmitter Need Info and Schematic

[Jim Hill]

Thanks for all the responses to my query, especially from Dave.  From 
the activity on the ARC-5 reflector, I think I should have posted 
there since it seems to be a predecessor.  My coil set has the following info:

Coil Set C275, serial number 4161  Order no. 1245-NY-41
Calibration for radio transmitter BC-AN-230, serial no. 4161
There's also a calibration table, giving dial settings from 6200 to 
7700 kHz, every 100 kHz

It appears that someone has attempted to use it, as there are 
penciled notes on the front panel giving dial settings for 7250, plus 
others for 15 CW, 15 fone, 21.3??  Maybe he was attempting to use it 
as a VFO. A fixed tap was changed on the open coil on the coil set, 
but the original wire is still there so it is easy to fix.

Dave, a few questions:
What is the B+ voltage?

What antenna is it designed for?  I'm guessing it is a low impedance 
antenna like the command transmitters and 50 ohms is too high.

Thanks, Jim





At 05:04 PM 8/28/2010, you wrote:
>I purchased a BC-AR-430 transmitter from W6IEE at the TRW Swap Meet
>today .  It looks fairly complete, missing tubes and tube bay cover
>plate, but with a plug in coil set that covers 40 meters. The coil
>set has a black crackle finish, while the remainder of  the rig is
>plain aluminum.  I assume there's a Navy version and the coil set
>came from a Navy unit.  Fortunately, there was a tattered piece of
>paper in the tube area that has a hand drawn schematic.  It's a MOPA
>rig, running VT-25A's (10Y) for the oscillator and final, plus two
>VT-52's (45 special with 7.5V filaments) in parallel as the plate
>modulator.  I have two 10Y's, and running the rig on CW will avoid
>the need for the 45 specials.
>
>Does anybody have info on this rig?  Does it have adequate stability
>for 40CW?  What plate voltage does it use?   Is a schematic
>available?  There's a number of X'ed out lines on the schematic
>(mostly in the modulator), so think some mods have been made.  I'm
>going to Office Depot or Kinco's in the near future and repro the
>paper, then open it up and see what's there.
>
>Jim
>
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