[Elecraft] HI CUR warning on K3

[W3FPR]

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!
>