[GreenKeys] RTTY receiver noise immunity

[Don Cunningam]

Nick,

You may have to "sneak" a HAL or Dovetron TU on board and make it the 
operational TU, but leave signal to the other one so it will look 
right.  I know it's not "original", but either has a threshold control 
to prevent the falsing you are experiencing.  Just a thought.
73,
Don, WB5HAK

On 4/20/2021 7:24 PM, Nick England wrote:
> 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 <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 
> <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 
> <mailto: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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