[Milsurplus] RCU-151A Survival radio info

[Mike Morrow]

Alan wrote:

> 241MHz might have been a training frequency. In the US, the training 
> radios were usually painted a different color, like yellow or red.

True.  The only other portable radio I've seen set for operation
on 241.0 MHz is the 1968 AN/URC-68.  Most that I have seen have
channel B set to 40.10 MHz FM and 241.00 MHz AM.

I have an oddball RT-159B/URC-4 with no government contract numbers,
and no serial number except one hand-inscribed at the top.  It was
marked at the time the front label plate was *printed* as operating
on 121.46 MC VHF, and 242.93 MC UHF.  However, the radio carries the
same crystal as any common AN/URC-4 for 121.5 and 243.0 MHz operation.
I've never been able to figure this one out...those two odd printed
frequencies are very close (-0.035 percent) to what a unit set for
121.5/243.0 would produce.  Plus, 242.93 is not exactly double 121.46.
Really odd.  The radio case is olive green just like most.

Mike / KK5F