Re: [Elecraft] Supplemental K3 Cooling
Keith, I had saved the configuration file before I sent the radio in for repair and I fully understand the need NOT to reload that file. However, is there a way to print out the saved file in a readable format so that I could set some of the old parameters in the new configuration? Thanks, Jim W2SM > On Jul 25, 2023, at 4:08 PM, Keith Trinity WE6R wrote: > > Jim, just to clarify, I put in the bi-polar replacement finals. We have some > left for repairs. > They are not interchangeable with the MOSFETs. > We had to design a whole new amp around the new MOSFETs, the KPA3"A" vs KPA3. > > You can set config menu "PA TEMP" to a higher number to have the fans come on > sooner. > (this won't help if the fans go to full speed and you still don't have enough > airflow). > > Keith WE6R Elecraft K3/K4 Tech. __ 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
Re: [Elecraft] Supplemental K3 Cooling
Keith, Thanks. Jim > On Jul 25, 2023, at 4:08 PM, Keith Trinity WE6R wrote: > > Jim, just to clarify, I put in the bi-polar replacement finals. We have some > left for repairs. > They are not interchangeable with the MOSFETs. > We had to design a whole new amp around the new MOSFETs, the KPA3"A" vs KPA3. > > You can set config menu "PA TEMP" to a higher number to have the fans come on > sooner. > (this won't help if the fans go to full speed and you still don't have enough > airflow). > > Keith WE6R Elecraft K3/K4 Tech. __ 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
Re: [Elecraft] Supplemental K3 Cooling
Jim, just to clarify, I put in the bi-polar replacement finals. We have some left for repairs. They are not interchangeable with the MOSFETs. We had to design a whole new amp around the new MOSFETs, the KPA3"A" vs KPA3. You can set config menu "PA TEMP" to a higher number to have the fans come on sooner. (this won't help if the fans go to full speed and you still don't have enough airflow). Keith WE6R Elecraft K3/K4 Tech. __ 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
[Elecraft] Supplemental K3 Cooling
I recently burned up the finals in my K3. I believe the problem was operating too high a power in FT8 mode for a sustained period on six meters. I’ve learned a few lessons (expensive ones too!) as a result, especially about monitoring the PA temperature. I was also advised by the service technician that the original KPA3 finals were bi-polar and fairly robust. However, they are no longer made so they replace them with newer MOSFETS which are more delicate. Given that the newer finals appear to be more delicate I’d like to see if there is a way to increase the PA cooling. The K3 operates in a uncooled garage in the tropics, so the ambient temperature is well into the 80’s already. I seem to remember comments years ago about either a replacement for the stock fans, or other ways to increase the airflow. I’d appreciate it if anyone has any suggestions. Thanks, Jim W2SM jimlc...@gmail.com __ 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
