[ARC5] Rooski ART-13 -link

[Mike Morrow]

Meir wrote:

> http://www.ruudleeuw.com/temp-petrykowski-il14.htm

John wrote:

> Looks like an ARN-6 or -7 on the lef side too.

I'd say a clone of neither AN/ARN-7 nor AN/ARN-6.  The closest AN/ARN-6
control box would be the C-149/ARN-6, and that is quite different
from what's shown.  It could (almost) be a clone of the C-4/ARN-7,
until one notices that it has only three positions on the band switch.
The AN/ARN-7 has four bands.  The only real clone candidate is the
BC-434-A control box for the three-band SCR-269 ADF.  There are two
installed on this aircraft.

Meir wrote:

>There is another interesting fact about my R-807:  the transmitter front
>panel and data book pages seem to indicate that the unit is a copy of a
>USN-type T-47/ART-13 with the 8Q-2 CFI/MCW unit, but using a mounting system
>based on the USAAF MT-283 and MT-284/ART-13 rather than the USN's early
>MT-161/ART-13 mounting rail system.  But if the R-807/RSB-70 was based on
>the transmitters on impounded B-29s, one would expect that the R-807/RSB-70
>would model the USAAF T-47A/ART-13, with the vernier scale above the VFO
>dial and a cal book with data at 1 kc intervals.

I've long had similar thoughts just as Meir has expressed about the R-807s
that I've seen.  None are clones of the USAAF's T-47A.

Neither R-807 (both the one shown in this aircraft and the one shown in
the recent auction) reflects the USAAF's T-47A/ART-13, which would have the
O-17/ART-13A three-band LF/MF oscillator and the VFO dial B vernier scale.)
They appear to be clones of the USN's T-47/ART-13, without vernier scale,
with the USN's O-16/ART-13 six-band LF/MF oscillator, and with the upgraded
MT-283 and MT-284/ART-13A mounts.  The auction photos reveal a Soviet version
of the 8Q-2 MCW/CFI unit instead of the early 8Q-1 unit of the ATC and early
T-47 transmitters.  Most USN T-47/ART-13s were manufactured or upgraded to
exactly the same characteristics by end of WWII.  IIRC, the R-807 cal book
provides cal data points at 5 or 10 kHz intervals rather than the 1 kHz cal
points that were provided in the AN/ART-13A cal book for the T-47A.  The
cal book data for all T-47 transmitters with the 8Q-2 unit are identical.
The cal book data for the R-807 are close but NOT identical to T-47 cal book
data.  I don't know if all R-807 cal book data are identical.

So...what version of this transmitter was on Soviet-impounded B-29s?

One would like to suppose that most late-WWII B-29s had the T-47A in their
AN/ARC-8 installation, but a lot of USAAF R.O.I.F. photos show a T-47 instead,
including the quickly discarded rail mounts of the MT-161/ART-13.  Perhaps
early AN/ARC-8 installations did use the USN T-47 when the improved T-47A
was not yet available.

In any event, I believe as Meir suggests...that other sources for cloning
the AN/ART-13 existed outside the equipment found on impounded B-29s,
including some semi-officially approved US sources.
 
Mike / KK5F