" 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 arch...@mail-archive.com
