Curt,
If you are transmitting full key-down for more than a few seconds (as
with digital modes), you should limit the power to 35 watts.
The CAL TPA menu will provide a reference for when the fan turns on - be
certain you have it set correctly - allow everything to cool to room
temperature (at least 1 hour) and then set the CAL TPA parameter to
correspond with the room temperature in degrees Celcius.
If you have not snugged down the mounting screws for the PA output
transistors yet, please do that to assure that they have adequate
contact with the heat sink.
Yes, the PA transistors will be hot to the touch after a few seconds of
keydown - but SSB and CW are intermittent modes, and full power is
normally only present for brief periods. The KPA100 watt rating is only
valid for CW and SSB modes, for other contiuous duty modes, 35 watts is
the recommended maximum power.
73,
Don W3FPR
Curt Milton wrote:
i do notice the finals are too hot to touch when
transmitting, but they cool in a few seconds when
transmit ceases. maybe this is normal (i have never
touched an operational 50 watt device before). i
guess i need to find where the K2 will tell me its
temperature to see if all is well.
73, curt
_______________________________________________
Elecraft mailing list
Post to: Elecraft@mailman.qth.net
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com
