For those interested in the QSK mod for the C line....the article "Full
Break-In with the Drake T4XC-R4 Using the Vacuum Relay QSK" appeared in the
March 1980 issue of CQ and was written by Richard Klinman, W3RJ. Richard
followed up with another article "Improved Spot Capability for the Drake
T-4XC and R-4C Using the Vacuum Relay QSK" in CQ September 1981.
The original concept ("A Vacuum Relay TTL QSK Antenna Switch) was in CQ
July1976, followed by a two-part description of applying his mod to the
S-line in CQ December 1977 and the Heathkit SB400/401 transmitter in CQ July
1978.
I got the earlier issue reprints from CQ....they may still be available for
those interested. I don't recall seeing these posted on any Drake web
site...would be nice if they were.
GL -- Dino KL�S/4
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