Hi Julian, Its perfectly OK to run the LPA at 10W for long TX periods on WSPR and related modes. The K3 bottom case area is designed as its LPA heatsink and its normal for that to be quite warm after long TX periods. And we're -way- below the max temp specs for the PAs in the LPA.
We've tested the 10W PA under 100% duty cycle for very long TX cycles. Our K3-F manufacturing testing includes overnight burn in with extended TX periods on each band. We haven't killed a LPA yet. :-) 73, Eric --- . Julian, G4ILO wrote: > > Eric Swartz - WA6HHQ, Elecraft wrote: > >> No worries. That's a normal amount of heat. We also heatsink one of the >> DC voltage regulators to the right side of the case. That's most of the >> heat you are feeling. >> >> No way you will hurt anything at that low of a power (or higher). >> >> >> > > It would be nice to be able to have the PA in on the act if you want to run > 10W. Admittedly 10W is a bit high for WSPR but some people do it. I don't > feel happy having the low power PA running at 10W for two minutes at a time > when I could have both of them running at a comfortable tenth of their power > rating. > > ----- > Julian, G4ILO. K2 #392 K3 #222. > * G4ILO's Shack - http://www.g4ilo.com > * KComm - http://www.g4ilo.com/kcomm.html > * KTune - http://www.g4ilo.com/ktune.html > > -- _..._ ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
