Andrew,
If the KPA100 low pass filter were a problem it would misbehave at both
the low and high power ranges because it is always in the circuit with
the KPA100 connected.
A "Hi Cur" message means the *base K2* is drawing current in excess of
the CAL CUR setting, and the power will be reduced to control the current.
If the HI CUR message only shows up when driving the KPA100, then I
would look for a problem in the input of the KPA100, or mis-calibration
of the wattmeter in the KPA100. If you bumped the setting for R26 while
working on the KPA100, that in itself may be sufficient to explain the
HI CUR indication. Did you measure the actual power output with an
external wattmeter or are you depending on the K2 display? If the
internal wattmeter is not properly calibrated, the actual power output
can be much greater than indicated by the K2.
73,
Don W3FPR
Andrew Lenton wrote:
Hi Don,
Thanks for that, Putting aside the K2's low power on 160, which no doubt has
a component error value somewhere, the KPA 100 has been working at 111 Watts
for two years until I disturbed the PA last week to make way for the DSP
board. So something has happened to the KPA100. I only get a high current
warning when the KPA100 is in use. 80 to 10 Metres is fine 11 watts no
warnings! I think something has happened to the high power low pass filter,
any thoughts?
73
Andrew G8UUG
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