I operated the contest with over 1200 contacts. I never saw temps over 80c. I too have a low serial number but have installed all the firmware updates. Only on 40m did I hear the fan speed get to a very high speed. I was running about 1200w at all times.
Richard *W7ZR* ex:5C5Z, CN2ZR, K2JSP, W6SBZ, W7KXR, K9ZIJ, W9KNF, W0KDF, W0MQU, J68ZR, KC6ZR, PJ4/W7ZR, KH2,W7ZR, KH6/W7ZR, V31ZR, VK4AAZ, XE2DV *Be joyful in hope, patient in affliction, faithful in prayer* On Mon, Nov 11, 2019 at 7:44 AM Fred Massey <[email protected]> wrote: > Thank you for the information. RTTY contests are the acid test of an > amp.... > > On Mon, Nov 11, 2019 at 8:35 AM Jim Miller <[email protected]> wrote: > > > 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] > ______________________________________________________________ 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]
