[Milsurplus] R-807 / ART-13

[jcoward5452 at aol.com]

How about the orange triangles under the locking bars?Wasn't that only 
ATC?
 Jay KE6PPF

-----Original Message-----
From: kk5f at earthlink.net
To: Milsurplus at mailman.qth.net
Sent: Mon, 18 Sep 2006 10:28 AM
Subject: Re: [Milsurplus] R-807 / ART-13

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
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