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Ameritron AL-811 ALC Question

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October 7th 05, 06:19 PM

Fred McKenzie

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In article . com,
wrote:
I have connected the Relay and ALC connections to my rig and the
amplifer works great except for the ALC protection. I have confirmed
for 100% certain the radio is connected correctly.

When attempting to adjust the ALC limit on the rear of the amplifier as
suggested in the manual I am not noticing any effect on the rig. I
have driven the amplifier up to to 85W, and still do not notice and
reduction of power on the radio as indicated in the manual.

Lloyd-

You would do well to contact Ameritron.

You say you have driven the amplifier up to 85W. Obviously that should be
85 watts drive to the amplifier's input.

Have you measured the ALC voltage? You should easily be able to figure
out the control's min and max, and see if the voltage increases as you
increase drive to the amplifier.

If the voltage increases and is adjustable to the maximum voltage for your
transceiver, the transceiver's output should reach a limit that can be
adjusted with the ALC control. If the transceiver doesn't react to ALC
voltage, then it has a problem, not the amplifier.

How is your transceiver set to drive the amplifier? Using CW? I would
expect that to work, but some transceivers may depend on your setting of a
power level control rather than using ALC. Injecting a tone into the
microphone circuit (or whistling?) on SSB, may be necessary for ALC power
limiting to occur.

73, Fred, K4DII

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