[R-390] R390 VS 390A

[John Kolb]

On Tue, 25 Jun 2002, Barry Hauser wrote:

> Hi Xu:
> You wrote:
>
> I believe both A and non-A work with the CV-591 and the older, bigger SSB
> converter (CV-157?).
>

The CV-157 wasn't a simple product detector and audio chain
like the CV-591, but designed to phase lock to a reduced level
carrier transmitted along with an SSB or ISB signal. It had
a motor controlled Automatic Frequency Control loop, and was
larger, had more tubes, and required a lot more maintaince
than the R390/390A's.

There were systems consisting of either one R-390 and one CV-159
or two of each in a cabinet (FRR38 and FRR-39?)

We used them in the Navy in the early '60's to receive
multichannel RATT (RTTY) transmissions before the WRR-2
or R-1051 were available.

John