Hi Joe,
...
Practically since the introduction of ALC (Collins?)
in transmitter systems and external amplifiers, ALC was negative
and modern solid state transceivers have maintained compatibility
with that "standard" even though it would have been easier if the
(external) ALC was positive.
For the record, SGC went the "solid state" way in their amplifier design
of the SG-500 SmartPowerCube. It uses positive ALC, which is of course
not usable by most transceivers without translation. So I run mine
without an ALC connection. The SG-500 protects itself from overdrive by
attenuating the input if it exceeds 60 watts.
My only problems with the SG-500 are that it doesn't do QSK and its
keying relay is a bit noisy.
Gus Hansen
KB0YH
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