KPA500 ALC Voltage

[Lyn Haddock]

Hello all,

My backup KPA500 has an issue with the ALC connection. As soon as I apply power to the amp, the ALC voltage on the connector goes to -5.2vdc. It is a “hard” problem, not effected by any tapping or poking around that I have done so far. It takes about 3 seconds for the voltage to decay when I turn off the power at the back panel.

My other KPA500 has zero volts on the ALC until I transmit and then the voltage varies, as it should. This ALC on the “problem” amp worked fine with a Kenwood rig (with 0 to -7vdc ALC range), but wouldn’t let an Icom rig transmit at all (Icom has a 0 to -4vdc range).

I don’t use ALC very often, but would like to have it working when I want it. Any ideas?

Thanks,
Lyn - KC8I


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[Don Wilhelm]

Lyn,

There is obviously a problem with your KPA500 ALC.
I doubt those of us here has the capability to diagnose the problem
properly.
Contact K3support and perhaps they can guide you through some checks
which will identify the problem area and allow you to either correct it
or determine if you need to send it in for repair.

73,
Don W3FPR

On 2/16/2017 10:47 PM, Lyn wrote:
> Hello all,
>
> My backup KPA500 has an issue with the ALC connection. As soon as I apply power to the amp, the ALC voltage on the connector goes to -5.2vdc. It is a “hard” problem, not effected by any tapping or poking around that I have done so far. It takes about 3 seconds for the voltage to decay when I turn off the power at the back panel.
>
> My other KPA500 has zero volts on the ALC until I transmit and then the voltage varies, as it should. This ALC on the “problem” amp worked fine with a Kenwood rig (with 0 to -7vdc ALC range), but wouldn’t let an Icom rig transmit at all (Icom has a 0 to -4vdc range).
>
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