[GreenKeys] Simple PLL TU

[hwhall@aol.com]

 I thought that sounded familiar.  Your link goes to a design called the NS-1 by Nat Stinnette W4AYV.  The link takes us to a Feb 1975 version in Ham Radio.  It appears he later deleted the input 741 amplifier & wrote that the PLL alone was so sensitive that it wasn't needed.  So, it went to a 2 chip board (NE565 PLL & 741 comparitor).  I'd ordered one of his boards back then to build mine.
If you were to work up a PC board for this, I would be interested in that.  I have a use for a simple TU that will only be fed clean AFSK inputs.
FWIW, I also had made up a PC board layout for the Eric Volpe demodulator that used the XR2211. I extended some of the traces & lands to accommodate parts with slightly wider lead spacings.  Should have also changed the connector lands.  I had a few boards made & have tested one but only briefly.
Here's more links to Nat's NS-1.

NS-1 demodulator first appeared in RTTY Journal, October, 1974https://www.navy-radio.com/manuals/tty/rtty-journal/1973-1977/PDF/VO22NO8.PDF
NS-1 PLL Update. RTTY Journal, Jan 1976, pg3https://navy-radio.com/manuals/tty/rtty-journal/1973-1977/PDF/VO24NO1.PDF
Active Bandpass Filter for RTTY, for use with NS-1 loop demodhttps://www.worldradiohistory.com/Archive-DX/Ham%20Radio/70s/Ham-Radio-197904.pdf
Update on the phase-locked loop RTTY demodulator," Ham. Radio, Aug 1976https://www.worldradiohistory.com/Archive-DX/Ham%20Radio/70s/Ham-Radio-197608.pdf

WayneWB4OGM
    On Tuesday, October 1, 2024 at 01:43:02 PM MDT, Ken LoCasale <wa4mnt at gmail.com> wrote:   

 Gang,

I found a simple two IC terminal unit for anyone that might want to try 
mechanical rtty on a budget. I think I'll layout a board and give it a 
try. Has anyone else seen it before and given it a try?

I put the .pdf here. https://qrpbuilder.com/simple-pll-terminal-unit

ken - wa4mnt
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