[Elecraft] [K3] Issue with HI CUR on 12m

[Don Wilhelm]

Bill,

Is this into a dummy load (bypass the ATU or tune the ATU into the dummy 
load).
If it is into an antenna, there are a whole lot of guesses about how the 
antenna behaves with higher power levels than your antenna analyzer 
shows.  So check it with a dummy load to eliminate the possibility that 
the problem is in the antenna.

Put an external wattmeter in line with the dummy load to eliminate 
questions about the calibration on the K3 wattmeter.

If you can measure the actual current drawn, that would also be helpful.

73,
Don W3FPR

On 1/11/2020 11:18 AM, Bill Coleman wrote:
> Back in early December, I installed two KSYN3As in my K3 SN 7071. Sometime after that, I noticed that on 12m, I’m seeing a HI CUR indication when I set the power level to more than about 80-85 watts. The K3 will back off on the power level, then slowly ramp back up until it hits HI CUR again.
> 
> I don’t remember seeing this before. After the KSYNC3A install, I ran the transmit gain calibration at both 5 and 50 watts, as specified in the instructions. Just in case something went awry, I ran it again.
> 
> I’m still seeing this problem. What causes HI CUR at 85 watts? The K3 ought to be able to produce over 110 watts on 12m.
> 
> I’m not seeing this issue on other bands.
> 
> No issues with calibration