I am using an FT1000D to drive an Alpha 87a, and am thinking of building a
"DC ALC" circuit to throttle back the juice to 60-80W out whenever the amp
is in "Operate" mode (because otherwise one day in the heat of battle I will
forget to reduce the drive power manually and probably cook the 3CX800s).
This would not be RF derived ALC, just a DC voltage applied in steady state
to reduce the power in the same manner as turning down the drive control on
the front panel.
AG6K, to whom I earlier mentioned this plan, has observed that using
suitable cathode resistors might be a more simple and reliable way to allow
the Alpha to accept a full 200W of drive. Point taken, although I am not
keen on adding 100W of dissipation to the cathode compartment and am willing
to take my chances with the reliability of an active circuit.
I was wondering what others think about this DC ALC approach, and if anyone
is currently using it?
Tnx es 73,
Curt W6XJ
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