[ICOM] ALC questions.

[Bob Marzari]

Sent this to the PW-1 list but have seen no action. Let me try it here.




To: ic-PW1
Subject: ALC questions.


Amp NOT making full power in SSB mode measured with a Bird Model-43 Thruline
with the 4300-400 PEAK capability. All the following are into a quality 50
ohm load.

Lets start with the PRO-3. It makes a full 100W in SSB with a sustained
fiveeeee or a whistle. It's ALC reads to the proper level, the end of the
orange marker.

Turn on the amplifier and repeat the above test and all you can get out of
the amp is 500 watts. The PRO-3 will only make 60 watts and it's ALC reading
is still at the right end of the orange marker. The ALC on the AMP barely
makes it to 1/4 scale in this condition.

My amplifier will make 1KW out in RTTY and CW and the ALC sits right at the
limit line.

Maybe I should set the ALC on the amp with an audio tone into the mic
circuit and then be careful to turn the power back in RTTY and CW? Should
not have to do this.

Any one else run into this????

Bob, W3PT