[GreenKeys] CV-116 dual diversity RTTY converter hookup

[Nick England]

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