[Elecraft] FS: Late KX1 Serial #002938
Extremely nice KX1 QRP radio, one of the last kits produced. This is a super nice example, maybe a collectors item https://wb8yqj.yolasite.com/elecraft-kx1.php It is the base radio with 40m/20m, other bands and the ATU are still occasionally found on the web. I have the original inner and outer cartons and the unmarked manual. Pick up from San Diego. Please contact direct email only, not here in the reflector! de Wb8yqj Don Carlsbad, Ca. USA Wb8yqj at Yahoo dot 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
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] KBPF3 mod SMD capacitors
Thank you, Keith, this is exactly what I needed to know! Nick On Tue, 25 Jul 2023 at 12:54, Keith Trinity WE6R wrote: > We use; C3,C4,C60.1uF , 50V, 10% X7R 0603Elecraft part # E530306 > It is not critical. > > Mouser and others have them; > https://www.mouser.com/c/?q=0.1%20uF%2C50V%2C10%25%2CX7R%2C0603%2CSMD > > DigiKey; > https://www.digikey.com/en/products/filter/ceramic-capacitors/60?s > > FYI, it is easiest to just tack the new capacitor on the old one instead > of removing the old one, wicking, cleaning. > Keith WE6R Elecraft K3/K4 > > > -- *N6OL* Saying something doesn't make it true. Belief in something doesn't make it real. And if you have to lie to support a position, that position is not worth supporting. __ 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
Re: [Elecraft] KBPF3 mod SMD capacitors
We use; C3,C4,C6 0.1uF , 50V, 10% X7R 0603 Elecraft part # E530306 It is not critical. Mouser and others have them; https://www.mouser.com/c/?q=0.1%20uF%2C50V%2C10%25%2CX7R%2C0603%2CSMD DigiKey; https://www.digikey.com/en/products/filter/ceramic-capacitors/60?s FYI, it is easiest to just tack the new capacitor on the old one instead of removing the old one, wicking, cleaning. Keith WE6R Elecraft K3/K4 __ 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
[Elecraft] KBPF3 mod SMD capacitors
I know the original KBPF3 mod kit is no longer available, but I've come across an unmodified board that I'm considering trying to source parts for to handle the mod myself. I did some searching and I read that a Nichicon RL81C221MDN1KX might work for the electrolytic cap, but I haven't found what the spec is for the 0603 SMD 0.1uF capacitors. Are these MLCCs, such that something like VJ0603Y104JXJAC would work? Nick -- *N6OL* Saying something doesn't make it true. Belief in something doesn't make it real. And if you have to lie to support a position, that position is not worth supporting. __ 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
