What output power did that reduce too ultimately, is 105c the design temp limit?
On Mon, Nov 11, 2019 at 8:30 AM Jim Miller <j...@jtmiller.com> wrote: > " I rode the drive power downward as the power increased to stay below the > trip point of 105c." > > Should have been "as the temperature increased" > > jim ab3cv > > On Mon, Nov 11, 2019 at 9:03 AM Jim Miller <j...@jtmiller.com> wrote: > > > I participated in the WAE RTTY contest this past weekend and was having > > problems with thermal tripping. > > > > I have resonant antennas for 80, 40 and 20m and had SWR between 1:1 and > > 1.2:1, power nominally set between 1400-1500w. > > > > I found that I couldn't repeatedly CQ without temperature creeping up so > I > > paused to around 50% duty cycle to stop that. > > > > However when sending QTC which amount to about 200 characters the > > temperature would rapidly increase and eventually thermal trip. > > > > I took several actions to try to compensate: > > > > I opened the shack windows and bundled up. Shack then stayed at 60f or > > below. > > I immediately manually cranked the fan speed to max (5) when started to > > send QTCs. > > I rode the drive power downward as the power increased to stay below the > > trip point of 105c. > > > > Upon taking all these actions I was able to eventually send the QTC > > packets but it was unnerving and unexpected. > > > > This is a low serial number KPA1500 but with latest production firmware. > > > > What have others seen? > > > > 73 > > > > jim ab3cv > > > ______________________________________________________________ > 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 > Message delivered to fhmas...@gmail.com > ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
