[GreenKeys] CV-116 dual diversity RTTY converter hookup

[Duncan Brown]

Nick,

I have used the CV-116 as part of an AN/GRC-26D (do you have that 
manual?), but it was almost 60 years ago in RVN.

We have a CV-116 (and some of the interconnect boxes) at the AWA Museum, 
but the weight and need to test 48 tubes had dissuaded me from doing 
anything with it.

All I remember about operation of it is that at the end of a contact, 
you need to turn off the AFC or put it in standby. Otherwise, the AFC 
goes hunting for the signal, gets to the end of its range and sets off a 
loud doorbell!

Have fun,

Duncan,
K2OEQ

On 11/4/2025 5:06 PM, Nick England via GreenKeys wrote:
> Well - it appears a little more complicated than the simplified
> diagram led me to believe - there is an internal loop supply with plus
> connected to the 6AQ5 plates and minus to ground through the TTY. Loop
> current is set by adjusting the 6AQ5 screen voltage,
>
> Nick England K4NYW
> Chapel Hill NC
> www.navy-radio.com
>
> On Tue, Nov 4, 2025 at 4:03 PM Nick England<nick at navy-radio.com> wrote:
>> I've had a CV-116/URR sitting around here for a long time and am
>> thinking about trying it out. The CV-116 is made for diversity
>> reception and is fed via IF signals from two R-390A receivers
>> connected to different antennas. It has 45 tubes (plus 2 motors for
>> AFC control) - what could possibly go wrong?
>>
>> Is anyone using one of these? It looks like the TTY interface is
>> pretty straightforward with an external 60ma loop keyed to ground via
>> a pair of 6AQ5 tubes.
>>
>> BUT -  the manual refers to needing an external "control unit" - what
>> does it mean by that?? Is it just a connector adapter? or?
>> "Because the teletypewriter output connection of the converter does
>> not match the input connection to a standard teletypewriter printer,
>> an intermediate control unit is required between the converter and the
>> teletypewriter printer."
>>
>> Nick England K4NYW
>> Chapel Hill NC
>> www.navy-radio.com
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