[GreenKeys] RTTY receiver noise immunity

[Nick England]

Yes, I’ve been going over this with them. I made a video using a similar
Navy receiver and the same model converter.
https://youtu.be/fwMSE2hZNCk

They are using a Navy R-1051/URR receiver and CV-3510A/UG or CV-3510B/UG
converter. The CV-3510 has mark-hold for steady space or steady mark or no
signal.

We are going through the tech manuals to see if there is some reason they
should have better no-signal noise immunity. But these were really designed
to optimize signal reception from a continuously broadcasting transmitter.
Not for ham-type operating. The converters were normally used in pairs for
frequency or space diversity. They also treat mark and space separately for
in-band diversity. But all that is for reliable operation when there IS a
signal. Also the converters originally fed crypto gear which then fed the
teletype. Perhaps the crypto gear may have provided the equivalent of
mark-hold in noisy no-signal conditions.

The CV-3510A manual is here
http://www.navy-radio.com/manuals/ura17e-cv3510a-man-8705.pdf

The CV-3510B manual is not publicly available.

Cheers
Nick


On Tue, Apr 20, 2021 at 7:50 PM Tom Hunter <n3crk at hotmail.com> wrote:

> Just my two cents - Has anyone asked what receiver and RTTY converter they
> are using and considered what is possible with those?
>
>
> Tom N3CRK   HH 12177
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-- 
Nick England K4NYW
www.navy-radio.com
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