It trips off at 105C. It starts warning with a yellow indication at 100c
Power reduced to 1kw helped slow the rate of temperature increase but still required a cold room and max fan speed at the beginning to contain it. It never stopped climbing. Jim ab3cv On Mon, Nov 11, 2019 at 9:32 AM Fred Massey <[email protected]> wrote: > 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 <[email protected]> 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 <[email protected]> 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:[email protected] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to [email protected] >> > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
