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 arch...@mail-archive.com
