[K2] Safely running 100% key-down modes

Posted by K1FFX on Dec 26, 2013; 5:06pm
URL: http://elecraft.85.s1.nabble.com/K2-Safely-running-100-key-down-modes-tp7582081.html

I starting to use my K2/100 in two 100% key-down modes, JT-65 and PSK-31.  What
should I be keeping in mind in protecting the output stage for the K2 and for the KPA100?

For JT-65, since it is a QRP mode, I'm running at about 5 watts, and transmissions are
limited to about 45 seconds.  So, I'm hoping that K2's output transistors will not be stressed
in this mode.

But, how about PSK-31?  I'd like to run about 20 watts and each transmission could easily
be 3 or so minutes.  I don't know at what output power the base K2 runs when the KPA100
kicks in (i.e., at above 10 watts).  I assume that normally the KPA100 will be loafing at 20
watts, but I'm not sure the impact of 100% key down on its output stage.

I'd appreciate any guidance in keeping the K2/100 "safe" in these modes.

Thanks -

Bruce K1FFX