[GreenKeys] Different Type Of TU

[kn7sfz]

What are feeding with your TUs John....heavy metal or computer...and if 
the latter, which program are you using to decode.

Curious minds...etc.,

Richard kn7sfz



On 5/22/2016 18:45, JC White wrote:
> A couple of months ago I came across an article for constructing a TU 
> that uses no tone filters at all.  The Dec 1991 issue of ELEKTOR, page 
> 18 - 20, has an FSK decoder based on a pair of one-shots.  Basically, 
> they are set to react to the period of an incoming tone, so actual 
> shift is not very important. Neither are the actual tones, as long as 
> the periods of the one-shots are adjusted (somewhat).  Having tossed 
> together the circuit I am rather surprised how well it works.  When I 
> have more time I will play with the circuit more and see how it 
> compares to my other TUs (ST-6, Dovetron, NS-1, several others).
>
> By the way, do any list members recall mountain California TTY guy 
> Grand Storey, who sold tone filters for many years?  Turns out I have 
> an ancient TU with his filters it.  Doggone things works rather well!
>
> John
> WB6BLV
>
>

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