[Milsurplus] R-807 / ART-13

[Mike Morrow]

John wrote:

> ... I am very curious to see how close the R-807 and the ATC/ART-13 really
> are, in looking at mine, I have identified only a few minor changes so far.

John,

I would suppose that the Soviets copied the T-47A/ART-13 that was on board the several PTO B-29s that they impounded.  Other than name plate, the most obvious visual clues that one is looking at a USAAF T-47A/ART-13, and NOT the earlier USN ATC or T-47/ART-13, are:

(1)  There is a safety interlock switch near the left front corner of the transmitter that opens when the transmitter top cover is removed, to drop out dynamotor control power.
(2)  Dial B (HF VFO) has a vernier scale on the movable plate behind the knob that allows the HF VFO dial to be set (if you have good eyes and a steady hand) to the nearest tenth of the smallest dial increment.
(3)  If the LF/MF oscillator is installed, it is an O-17/ART-13A (with only three bands) and NOT a USN O-16/ART-13 (with six bands).

Does your Soviet copy have the characteristics above?

Does the Soviet copy come with a calibration book that fits below the front panel?  If so, is it calibrated in 1 kc increments all the way up to 18.1 mc?  That also is a characteristic of the T-47A/ART-13 calibration book.  The USN ATC or T-47/ART-13 calibration book is in 10 kc intervals at the high end of HF coverage, due to not having the HF VFO dial vernier as described in item (2) above.

I've seen a picure of the Soviet copy of the C-87/ART-13, and it looked very very similar to the original.

Mike / KK5F