[ARC5] Rooski ART-13 -link

[J. Forster]

I was looking at the azimuth (radio bearing) indicators, not the CB. How
do you figure there are two ADFs? Yes, there are two indicators, but only
1 CB as far as I can see.

-John

==============


> 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
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