[GreenKeys] Info needed on CV-278/GR

[Duncan Brown]

Yes, tune the radio for peak on the input and you should see the 
discriminator meter swing from one side to the other as you tune a 
carrier through the passband.

BFO is inserted later, so will have no effect on the CV-278.

The CV-278 converts the 455Khz down to 20-30Khz for another stage of IF 
filtering.

Good luck,

Duncan
K2OEQ


On 05-Nov-22 19:28, Harold Hallikainen via GreenKeys wrote:
> 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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>