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

[William J. Neill]

One R-390( ) + one CV-157 = AN/FRR-40

Two R-390( ) + two CV-157 = AN/FRR-41 (one R-390 per CV-157)

Bill Neill
Conroe, TX

On May 20, 2008, at 4:15 PM, Roy Morgan wrote:

>
> 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