[Elecraft] K2 #2456 is OFF THE AIR! - Update.

[Mark J. Dulcey]

Dan Barker wrote:

> 
> One remaining odd thing is that the RF power output seems to creep up slowly with key down. I can't see it on the oscilloscope, but one "store bought" RF power meter, one Heathkit power meter, and the RF Probe/DMM all show the effect. Could this be a problem? It'll creep up from 4.2 watts on key down, to nearly 5 watts 30 seconds later. I'm never key down for 30 seconds in operation. My code isn't THAT slow<g>. Is this anything to worry about? Is this related to the MCU not having any idea what the supply voltage might be?

That's normal. It's caused by thermal effects in the output 
transistors. The increase of gain in the K2 is modest; well away 
from thermal runaway.