Chris, I have two JetStream switching supplies that I have used for four years. I have not been able to attribute any spurious receiver responses to the supply in either my TS-850 or my Elecraft K3. I have a few continuous carriers that seem to be spurious on 10 meters and 6 meters, but they are very weak, less than S1 and I have never lost a contact that I blame these signals. I read a lot of comments about the power supply generated artifacts, but I have not seen any that properly documented a serious problem with any commerically offered supply. One of my JetStreams does have some fan noise that I can hear when my air conditioner is not running and my amplifier is turned off. I would categorically say that there is a lot more worry about switching supplies than the actual problems warrent. I am sure that there are many who will not be convinced, but I have worked over 200 countries per year for the last four years while using switching supplies and I have an Astron analog supply sitting on the shelf that I don't use as well as a Pyramid analog supply that needs repair in the closet.
Willis 'Cookie' Cooke K5EWJ ________________________________ From: Chris Hembree <[email protected]> To: Tom W8JI <[email protected]>; Larry 'Rebar' Rebarchik - N6CCH <[email protected]>; [email protected] Cc: [email protected] Sent: Fri, July 16, 2010 9:08:36 PM Subject: Re: [Elecraft] K3 on Order Very good Point.. What switching supply's are you using? Thanks Chris ________________________________ From: Tom W8JI <[email protected]> To: Chris Hembree <[email protected]>; Larry 'Rebar' Rebarchik - N6CCH <[email protected]>; [email protected] Cc: [email protected] Sent: Fri, July 16, 2010 6:35:06 PM Subject: Re: [Elecraft] K3 on Order > My concern for any Switching supply is the RFI noice that the radio will pick >up > from the power supply. Looking at the SEC 1235m, I was reading that it has a > build in RFI filter. Plus I like the AD5X mod to slow down the fan. And the > Alinco DM-340 MVT has a knob to change the freq. of the noise that the radio is > picking up. Any power supply that has a VFO knob built in means they either don't know how to get harmonics down to the proper level or don't want to spend a few bucks on components, so they took the cheap way out. I have several switching supplies and can't hear any of them anywhere unless I run an antenna right in the room. ______________________________________________________________ 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 ______________________________________________________________ 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
