[Elecraft] ALC

[Mike Penkas]

My QRO2500, a tube amplifier, works great with my K3, but the amp will withstand and shut down if I accidentallyforget to turn down the drive after running the K3 barefoot.The amp I want to use, with bandswitching capabilities, is my PW1.It will not tolerate a mistake of excessive overdrive. This has been gone over before, it is not a matter of splatteror flat-topping but protection of the amp by the ALC if oneinadvertently forgets to turn down the drive.I am sure a circuit is coming to permit the acceptance of negativeALC by the K3 but until then I don't trust myself to hook up my solid state amp.                  Mike WA8EBM Just as well I have an Acom 1000, it works perfectly with my K3...
No keying issues and no ALC needed (or provided) and one simple phono to phono coax lead between them for keying.

73 Dave, G4AON
K3/100 #80
Acom 1000

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The biggest events I have seen are pretty important: The reversed 
polarity of the ALC voltage (K3 ALC polarity setup is not presently 
compatible with widely used amps from Yaesu and ICOM - perhaps 
incompatible with ALL amps requiring ALC, but I am not sure about 
that). This was discussed on the k3 yahoo reflector a couple weeks 
ago. Also the mention here  the other day of a similar polarity 
mismatch problem with a CW loopback feature for QSK (that I don't 
really understand).

Elecraft says they will develop a work around for the ALC problem at 
some future time. This ALC thing is a major item for AMP users trying 
to follow their manufacturer's instructions for setup.

Jerry W4UK