[ARC5] Navy Versus USAF Radio Equipment

[J. Forster]

The -9A has digitally settable timing circuits. No counting pips. I think
you just crank a cursor until it is on the slave.

It LOOKS like the power supply, receiver, and some other things are stock
-9. The timing circuits are completely different and have >30 2C51W twin
triodes.

http://www.radiomuseum.org/tubes/tube_2c51.html

I'd guess they are set up as flip-flops or more probably ring counters,
but I don't know. There is also a comple arrangement of gears, switches,
and Veeder-Root counters.

Best,

-John

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


> What distinguishes a 9A from a plain 9?
>
> Scott W7SVJ
>
> -----Original Message-----
> From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net]
> On
> Behalf Of J. Forster
> Sent: Saturday, March 30, 2013 7:03 AM
> To: Robert Eleazer
> Cc: arc5 at mailman.qth.net
> Subject: Re: [ARC5] Navy Versus USAF Radio Equipment
>
> If it had an APN-9A I would be very, very interested. AFAIK that unit is
> almost mythical. It would be completely mythical if I didn't have one
> sitting here, without a shed of paper.
>
> -John
>
> ===================
>
>
>
>> Looking at my C-119/R4Q-1 pilot's manual I note that the Air Force
>> version has ARC-3, ART-13A and BC-348-Q.  The Navy version has ARC-1,
>> and ARC-8, which is described as an ART-13A and BC-348-E.  Both
>> versions show the low freq oscillator installed.  But the Navy added
>> an LM-14 Freq Meter and apparently also had an ARC-2 installed at the
> navigator's station.
>>
>> Apparently both versions had an two ARN-7's and APN-1.  The Navy had
>> an
>> APN-4 LORAN set while the Air Force had an APN-9 or 9A.
>>
>> Wayne
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