[ARC5] AN/CRC-7 and Gliders - Part 2

[Mike Everette]

The AN/CRC-7 was carried in Army Air Forces B-29s in the Pacific.  It is described in an operational crew training manual which was reprinted in hardback form some years ago (early 1990s): I own a copy of this but can't put my hands on it at the moment.  When I find it, I'll post the information.

If anyone has a copy of the ROIF (Radio Operator's Information File), it might even be described in that manual.  I haven't seen the ROIF, but I clearly remember the CRC-7 being referred to in the B-29 training manual.  I can't say whether it may have been carried in other aircraft.

73

Mike
W4DSE

--- On Wed, 5/29/13, Mike Morrow <kk5f at earthlink.net> wrote:

> From: Mike Morrow <kk5f at earthlink.net>
> Subject: Re: [ARC5] AN/CRC-7 and Gliders - Part 2
> To: arc5 at mailman.qth.net
> Date: Wednesday, May 29, 2013, 12:09 AM
> I wrote:
> 
> > The AN/CRC-7 wasn't AFAIK, available while WWII was in
> progress.
> > In addition, it is a US Navy set, not an Army
> set.  That makes a
> > difference.
> 
> It's also worth noting the the AN/CRC-7 electronics section
> (with
> four tubes) is a hermetically-sealed (with solder!) unit
> that was
> manufactured with an enclosed crystal for 140.58 MHz
> operation.
> The crystal is wired into the base of the oscillator plate
> coil
> in the sealed section.  Changing frequency of
> operation, even any
> actual electronic maintenance other than changing the
> battery 
> (which is outside the solder-sealed section) was never
> intended. 
> The AN/CRC-7 is a unit intended for all time to be operated
> only
> on the 140.58 MHz established at time of manufacture.
> 
> It would have been a very poor choice for glider service,
> even
> if the US Army had these Navy sets in 1944 (which they did
> not).
> 
> Mike / KK5F
> 
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