K2/100 ALC or Power problem

[Julius Fazekas n2wn]

Hello All,
I've had a problem crop up that has me scratching my
head.
I have K2 #3311 with the KPA100 and the KAT100. It's
possible this problem has existed for a while, but
I've just noticed it when trying to rebuild my
antennas after a microburst attack. I can set the
power level, according to the front panel from .1 Watt
to 110 Watts, the relay clicks in at 10 Watts and the
indicator on the ATU shows the change from high to
low. Unfortunately, the low level is about 20 Watts
only on a power meter, and high power is only 110
watts, no adjustment. I'm not getting a Hi Current
message as well. Any suggestions where to look? I've
checked for burnt components, open R50, I don't appear
to be getting any KPA100 bias voltage. The Cal Cur is
set at 2.00 (did try adjusting it to 3.50 Amps, per
the KPA manual). It had been operating correctly, but
have only operated sporadically for the past few
months.

Thanks in advance,
Julius
n2wn
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[Don Wilhelm-2]

Julius,

You will likely find the problem associated with the VRFDET signal
somewhere.
Also, if you recently did the keyclick mod, look at that work carefully for
proper components, good soldering, and parts added in the correct spots on
the back of the control board.

73,
Don W3FPR

----- Original Message -----

> Hello All,
> I've had a problem crop up that has me scratching my
> head.
> I have K2 #3311 with the KPA100 and the KAT100. It's
> possible this problem has existed for a while, but
> I've just noticed it when trying to rebuild my
> antennas after a microburst attack. I can set the
> power level, according to the front panel from .1 Watt
> to 110 Watts, the relay clicks in at 10 Watts and the
> indicator on the ATU shows the change from high to
> low. Unfortunately, the low level is about 20 Watts
> only on a power meter, and high power is only 110
> watts, no adjustment. I'm not getting a Hi Current
> message as well. Any suggestions where to look? I've
> checked for burnt components, open R50, I don't appear
> to be getting any KPA100 bias voltage. The Cal Cur is
> set at 2.00 (did try adjusting it to 3.50 Amps, per
> the KPA manual). It had been operating correctly, but
> have only operated sporadically for the past few
> months.
>

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