[GreenKeys] Suggestions for RTTY tone decoder

[Duncan Brown]

Joe,

The CV-89A is a good FSK decoder. One unit can be used by its self for 
normal reception/demodulating.  It takes two CV-89As, plus a CM-22A 
comparator to do diversity.  The HAL ST-6 is a good, solid state, FSK 
decoder, but will typically only do 850 &/or 170 hz shift. (The CV-89A 
will do any shift from 10-1000 Hz)

That being said, there is not much clear-text FSK left on the HF radio 
bands anymore.  If you just want to decode ITTY, a very simple AFSK  
decoder can be used, since there is no QRM, fading, etc.  I think there 
are people on this list who have built them and hopefully they will add 
their experiences/designs.

Good luck & Have fun,

Duncan Brown, K2OEQ
USASA  31J30

Antique Wireless Association Museum Asst. Curator, Commercial Equipment
(also Chief TTY operator & repairman)
http://www.antiquewireless.org/


On 01-May-17 09:44, Joe Herdler via GreenKeys wrote:
> Hi again,
>
> Looking for suggestions and recommendations for a tone decoder. I have 
> found the old NAVSHIPS CV-89A (several of them actually) unit on ebay, 
> but they are meant for diversity reception. I do not have the room for 
> a huge antenna farm for diversity reception, nor do I have dual 
> radios. Also, those decoders are over 50 years old, and I am not that 
> competent on repairing tube electronics.
>
> Any ideas? I do prefer tubes over solid state.
>
> Has anyone used the CV-89A for their RTTY / RATT set up?
>
> Thanks again!
>
> Best,
>
> Joe Herdler
> KB0TXC
>
>
>
>
>
> NNNN
>
>
>
>
> Consciousness affects the medium. Think happy, be happy, and happiness 
> will follow you.
>
>
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