[GreenKeys] Info needed on CV-278/GR

[Harold Hallikainen]

I helped Mike with this unit this afternoon. It seems to work, but prints
garbage when I send him 850 Hz shift. Since it is an IF FM discriminator,
I'm thinking it should be tuned to peak the input level meter and zero the
discriminator, which, I think, uses the peak mark and space outputs out of
the discriminator to drive the meter. This also has a polar relay output,
so the contacts were just put in Mike's local loop.

I wonder about the effect of the BFO. Is it inserted in a later IF stage
so it does not interfere with the discriminator?

The stuff Mike has is really clean and looks new.

Harold


On Sat, November 5, 2022 1:18 pm, Robert Downs via GreenKeys wrote:
> As previously stated, CV-278 is the receiving converter of Radio Teletype
> sets AN/GRC-46 or AN/VRC-29.  These sets are modifications of Radio Set
> AN/GRC-19 (R-392 and T-195).  Also required are a transmitting converter,
> some junction boxes and a TTY set.  The stack of manuals for the whole
> system is around 4”to 6” high.  I offer reprints of some of them.
>
>
>
> Robert Downs
>
>
>
> From: greenkeys-bounces at mailman.qth.net
> [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Mike
> Sent: Saturday, November 5, 2022 00:39
> To: GreenKeys at mailman.qth.net
> Subject: [GreenKeys] Info needed on CV-278/GR
>
>
>
> Hello group,
>
>
>
> Recently acquired a CV-278/GR "CONVERTER, FREQUENCY SHIFT"
>
>
>
> All I can find online is a TM maintenance manual which is somewhat
> limited.
>
>
>
> I'm looking for what the specifications and capabilities are for this
> unit. (Freq, shift, etc)
>
>
>
> Anyone familiar with it?
>
>
>
> Thanks...
>
>
>
>
>
> Mike
>
> KD7VRG
>
> Tucson, AZ
>
>
>
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