[Elecraft] K2+KPA100 hi current and hi output

[Don Wilhelm]

Andre,

Do you have any power control?  To check set the power to about 50 watts 
and do a TUNE.  Measure the actual power output with an in-line 
wattmeter and a 50 ohm dummy load.

If it still goes to 160 watts, you do not have any power control.  The 
usual reason is the diodes D16 and D17 (1N5711 type) have been damaged 
by static coming in on the feedline.  Replace those diodes and re-check.

If that does not fix it, I can help with additional troubleshooting.

73,
Don W3FPR

On 9/4/2020 4:39 PM, atfu wrote:
> Dear All,
> 
> I gave a new home to a  K2 + (KPA100+KAT100 in EC 2), ser#>5000. The K2
> on its own is runnung fine.
> 
> When I connect to the KPA+KAT I get HiCur warning (on initiating TX) on
> all bands with POW>10W. This also happens when I transmit into a dummy
> load. I measured the output from the dummyload with a DMM. There are
> only two values (depending on the dialled in watts):
> 
> Below 10W = 38 VDC (= 14W)
> Above (I checked 20, 50, 80, 100W) = 129 VDC (= 160W!!)
> 
> In other words, as soon as the KPA is activated, the output is 160W
> (according to my formula for converting VDC in W). The meter on the
> power supply (good for 25A) confirms that I draw about 20A above 10W in,
> apparently only limited by the slow 20A fuse in the line.
>