[GreenKeys] Mainline TT/L Wanted

[Jeffrey D Angus]

The Mainline TT/L demodulator was designed by Irv Hoff, W6FFC.
It was published in the August 1965 edition of QST.
Available for members of the ARRL here:
<http://p1k.arrl.org/pubs_archive/54194>
Another copy, not as clear, is available here:
<http://www.rtty.com/development/tu/ttl-fsk/ttl-fsk.htm>
And more information on Irv here:
<http://w7ay.net/site/Technical/RTTY%20Demodulators/Contents/hoff.html>

By the way, the "tuning indicator" was a 6FG6/EM84. Two light blue
vertical bars that would come together in the middle. It was a popular
tuning indicator for FM tuners at the time.

The loop was directly keyed with a 6W6 pentode.
Transmit was via FSK on the transmitter.


-- 
Jeff-1.0
wa6fwi
http://www.foxsmercantile.com