Pete,
The first thing to check for a HI CUR warning is the power supply
voltage under full transmit load.
If it is low, it will cause a HI CUR condition.
The other thing that could cause it is a problem in the T/R switch or
Low Pass Filter - the fact that it continues into an RX cycle points to
that possibility.
73,
Don W3FPR
On 11/7/2023 10:31 AM, Pete Smith N4ZR wrote:
I send a few characters of CW into my Carolina Windom on 40M and after
a delay (1-5 seconds after I stop sending) the K3 flashes a HI CUR
warning, and the audio gain is reduced significantly. Touch the AF
gain control and it instantly returns the gain to normal, but
frequently the HI CURR warning returns over and over, without any
additional transmissions. This sequence does not happen, even with
1500 watts, into my dummy load, nor does it happen on the same antenna
on 80M, or on 20 meters on my tribander.
I've read the HI CUR warning discussion on page 65 of the manual, but
it doesn't seem relevant, because I don't have external speakers. The
fact that it only happens when feeding an actual antenna on one band
suggests RFI, but the fact that the HI CUR warning and gain reduction
recur again and again long after any RF has me puzzled. Any
suggestions gratefully accepted!
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