[GreenKeys] Terminal Units

[AI2Q]

My first TU, built back in 1961 when I was in high school, was a W2JAV type, 
with a W0HZR phase-shift oscilloscope on the same chassis  (how those 
callsigns stick in my mind!). I built both from the plans in Byron 
Kretzman's RTTY Handbook.

I still have both the handbook and the 850-cycle shft TU and scope.

These days I drive my Model 28 KSR with a partially homebrew TU that uses 
the front-end from a Kantronics UTU. I also use this set-up to drive my 
transmitter. The schematic and more details can be seen on my Web site.

http://users.adelphia.net/~alexmm/rtty/tu1.htm

The National Semiconductor MF-10 switched-cap filter chips in the UTU, 
although now considered obsolete, work really well. I can dig copyable 
signals out of the noise. The TU itself is very small and low power, and my 
logic board is also small and simple.

Vy 73, AI2Q, Alex in Maine
FOC 1861, ARRL, AWA, QRP-L 687
http://users.adelphia.net/~alexmm/ai2q.htm