I had thermal warnings on my KX3 with WSPR at 0.1 watt. 60% duty cycle, however.
On Sun, May 14, 2017 at 12:19 PM Walter Underwood <wun...@wunderwood.org> wrote: > First, read the specifications. They are on page 54 of the latest KX3 > manual. > > " 5 W or less recommended for high-duty-cycle modes (FM, AM, DATA). Power > will automatically be reduced if PA temperature or current limits are > exceeded.” > > A larger heatsink was introduced a couple of years ago. The serial numbers > for the new heatsink are listed on the mods page. > > http://www.elecraft.com/order_form_parts.htm#kx3 < > http://www.elecraft.com/order_form_parts.htm#kx3> > > Description and instructions include this: "The enhanced heat sink is > thicker than the original and wraps around the bottom of the KX3 as shown > in Figure 1. The additional mass and area of this heat sink provides as > much as twice the operating time at full power before the KX3’s protective > circuitry automatically reduces the power to 5 watts." > > > http://www.elecraft.com/manual/E740254%20KX3HSMDKT%20Heat%20Sink%20Installation%20rev%20A.pdf > < > http://www.elecraft.com/manual/E740254%20KX3HSMDKT%20Heat%20Sink%20Installation%20rev%20A.pdf > > > > For digital modes that require a lot of headroom and linearity (PSK31), > I’d probably stick with 5 W. > > wunder > K6WRU > Walter Underwood > CM87wj > http://observer.wunderwood.org/ (my blog) > > > On May 14, 2017, at 8:05 AM, Kevin - K4VD <ke...@k4vd.net> wrote: > > > > From a recent post: > > > > "We have been told by people running the rig in digital modes at 10W the > > unit will thermal down after a few transmit cycles" > > > > I understand the KX3 also had an early issue with heatsinks that was > > corrected in time by the company making the aftermarket heatsink > > unnecessary I think? I wonder if Elecraft has acknowledged the issue and > is > > correcting it for the KX2 also? > > > > It seems odd to me that an issue like this would go unmentioned and > > unaddressed by Elecraft. > > > > 73, > > Kev K4VD > > ______________________________________________________________ > > 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 wun...@wunderwood.org > > ______________________________________________________________ > 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 r...@wc3t.us -- 73 (or 72 for the QRP folks), Rich Hurd / WC3T Northampton County RACES EPA-ARRL Public Information Officer for Scouting Latitude: 40.761621 Longitude: -75.288988 Grid: *FN20is* 40°45.68' N 75°17.33' W ______________________________________________________________ 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
