[GreenKeys] TU replacement

[Eric]

I agree, the one i did using the 2211 is fine for itty but not really for weak signals on the air. Though given the amount of rfi in my urban neighborhood,  nothing really works very well for that.  :(

On August 21, 2019 2:44:36 PM PDT, Jim Haynes <jhhaynes at earthlink.net> wrote:
>On Wed, 21 Aug 2019, Harold Hallikainen wrote:
>> Not existing right now, but I plan on building a demodulator using an
>> XR2211. I've used this in lots of projects over the years, including
>> driving a model 15 in the early 1970s.
>>
>Well there's the Volpe demodulator that uses that principle.  I'm not
>authoritative, but have the opinion that phase locked loop demodulators
>are only good if you have good signals, perform poorly with FSK in
>the presence of noise and interference.  Which of course is not a
>problem
>with ITTY, but for on-the-air use you need something better.
>
>Jim W6JVE
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