Hi Eric, My 1500 is s/n 423. I do think the power supply fans are a bit loud in standby. Is my amp prior to the resistor change? I have added the load resistor in the field and done the sample out mod for adaptive predistortion in the field also.
73 Dave wo2x -----Original Message----- From: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> On Behalf Of Eric Swartz WA6HHQ - Elecraft Sent: Saturday, May 23, 2020 11:53 AM To: Larry (K8UT) <k...@charter.net> Cc: elecraft@mailman.qth.net Subject: Re: [Elecraft] KPA-1500 power supply fan noise Hi Peter, If the amp is on, there needs to be at least some PS fan activity at a low speed to cool the PS in idle. What s/n is your 1500? On later s/ns we changed a resistor in the ps fan circuit to slow them down a bit more. An alternative is to swap your ant 1 and 2 connections, putting the 6m ant on ANT 1. Then you can listen to 6m with the amp off. 73, Eric elecraft.com --- Sent from my iPhone 6S > On May 23, 2020, at 8:10 AM, Larry (K8UT) <k...@charter.net> wrote: > > Peter > > I built a slightly longer cable to match the length of the control cable that > came with the amplifier (about 3 feet longer if I recall correctly). > > This allows the PS to operate "remote" in a closet with the door closed. > > -larry (K8UT) > > ------ Original Message ------ > From: "Peter Dougherty" <li...@w2irt.net> > To: Elecraft@mailman.qth.net > Sent: 2020-05-23 10:33:19 AM > Subject: [Elecraft] KPA-1500 power supply fan noise > >> Is there any way to power off the fans (or lower their RPM) on the >> PSU if the amp is in standby mode? >> >> I would like to keep my rig on 6m throughout the day during the Es season. >> The problem is my 6m antenna is on antenna port 2 on the KPA, which >> requires the amp to be powered up. I only need to TX when a new grid >> pops up, but I do like to monitor the band during the day while I'm >> working. My XYL is working from home, and is in the same room for >> about 9 or 10 hours a day, and the noise after 10 minutes was too much for >> her. Any suggestions? >> >> Please-n-thanks. >> >> --------------------------------------------- >> 73 and Good DX >> Peter, W2IRT >> >> >> >> President, North Jersey DX Association >> >> DXCC Card Checker >> Letter O Manager, ARRL Incoming 2nd District QSL bureau >> >> >> >> ______________________________________________________________ >> 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 >> k...@charter.net > > ______________________________________________________________ > 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 > eric.swa...@elecraft.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 rocke...@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
