[R-390] R-390 and CV-157 timeframe

[Roy Morgan]

On May 20, 2008, at 9:03 AM, Sheldon Daitch wrote:
> The CV-157 has an AFC circuit,

I seem to remember someone who WAS there telling that the CV-157 came  
out after the R-390/URR but before the R-390A/URR. It was used in a  
diversity setup with two R-390/URR radios.

> someone in systems design recognized a need for the AFC
> circuit in the CV-157.

I would guess that use of multi-channel, independent sideband RTTY  
broadcasts came after the R-390A was in use and available.

The R-1051 and that monster National receiver with two cabinets  
joined above one another were designed with the needed stability  
built in.

Also, Nike missile sites were equipped with transmitters (and  
presumably receivers) fed from a then state of the art master  
oscillator, known as The Sulzer frequency standard.  I'd guess that  
the Nike sites were silent, and maybe the central control stations  
were also, and they needed the transmitters and receivers to come up  
ON frequency, without doubt or any pre-broadcast frequency checks or  
tune-up periods.

Roy


Roy Morgan
k1lky at earthlink.net
Lovettsville, VA 20180