Personally I think it works great as designed. Yes there could be changes but I doubt we'd see much, if any difference in performance.
Hams today in general seem to delight in complaining. I find many should look in a mirror to identify the source of an issue. I'm one that believes in keeping things simple. Bob, K4TAX Sent from my iPhone > On Oct 2, 2019, at 9:12 AM, Bob <[email protected]> wrote: > > Personally, I wish Elecraft offered a slightly different approach, rather > than a minimum fan speed setting, how about a RX minimum and TX minimum? > This would allow quiet operation on RX, but would anticipate a higher > demand for cooling on TX. > > There is quite a bit of thermal mass and overshoot that happens in TX on > digital modes. By the time the fan turns on, it tends to be running behind > the curve trying to catch up. Starting the fan running as soon as the rig > goes into TX would help considerably and allow things to go back to quiet > in RX. > > 73, Bob, WB4SON > > >> On Tue, Oct 1, 2019 at 4:58 PM Bob McGraw K4TAX <[email protected]> wrote: >> >> For SSB voice operation and CW operation I leave the fan speed at >> NORMAL. For digital modes, which all have a higher duty cycle, I >> usually set the fan speed to 1. I do find the fan speed increments up >> and down as needed and as driven by the temperature. When running 400 >> to 500 watts most of the time for digital modes, I occasionally see 60 >> degrees. The fan speed at 1 does not elevate the room noise at all. >> In fact, I don't hear it, although I do have sound damping material on >> the wall immediately behind the equipment. Usually something in the >> house or shack is making more noise. >> >> As to if setting the fan speed to 1 for digital modes, it seems to keep >> the amp temperatures overall a bit lower. No scientific study conducted. >> >> 73 >> >> Bob, K4TAX >> >>> On 10/1/2019 11:51 AM, Andy Durbin wrote: >>> Thanks to everyone who contributed their experience of operating with >> min fan speed set above 0. >>> >>> I have some ideas for a test series and I'll share anything I learn from >> it. >>> >>> Here is a teaser for those interested in KPA500 thermal management. Did >> you know that, for a KPA500 that has not transmitted for a long time, the Z >> bracket is hotter than the heat sink and the heat sink is hotter than the >> finals. For that condition the heat flow is from the Z bracket, into the >> heat sink, and then it heats the finals. The heat flow reversed during TX >> as the finals heat up. >>> >>> 73, >>> Andy, k3wyc >>> ______________________________________________________________ >>> 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] > ______________________________________________________________ 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]
