[GreenKeys] RTTY remote scope aboard ship

[Roy Morgan]

On Dec 4, 2011, at 11:53 AM, Nick England wrote:

> I have a couple of USN remote RTTY (RATT) indicator scopes - IP-352/ 
> UR.....
> Where would you install it? - ...
>
> None of these make a lot of sense to me.

Nick,

If I remember right (sorry, I did not dig out the manual from among  
the many digits stored here), The CV-591 has the ability to be tuned  
remotely.  I'd guess that the tuning is done via some DC impressed  
upon the audio output line and that runs a reactance tube in the local  
oscillator (set to non-crystal mode).  With this lashup, someone at a  
remotely located TTY terminal unit could tune the thing back to nice  
balance and not be anywhere near the receiver and/or it's associated  
SSB converter.

I don't have as strong a memory about any of the Northern Radio  
Company equipment, but there's a faint hint from the memory bank that  
some of their stuff could also be tuned a bit remotely.

In the day of the R-390A, this might well have been desirable with  
multiplexed RTTY broadcasts, when frequency accuracy in the  
demodulated audio signals was somewhat critical and tube type stuff  
drifted a bit.

Ok, I looked in the manual,
Navships0967-051-2010
Technical Manual for Single Sideband Converter CV-591A
Table 1-1 Equipment capabilities
Remote Control Features (Shore Stations Only):

"Selection of upper or lower sideband, +/- 3 kHz bandspread tuning,  
BFO ON/OFF control"

Roy

Roy Morgan
k1lky at earthlink.net
K1LKY Since 1958 - Keep 'em Glowing!