Switching supplies and the K3
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Hi,
I am back on the Elecraft list after being gone for quite a while. I have a K3/100 coming in the next month or 2, and now I am thinking about how it is best to power it. The K3 has a nice small footprint and that will be much welcomed in my small operating area. And, I don't want to dwarf the available space with a big linear power supply. Therefore, I am considering a switching power supply with its small size as well. Switching supplies have come a long way relative to the RF hash generation issue and I am considering going that route. I sure don't want to degrade the K3'3 outstanding performance with a noisy supply, so I am still cautious. The eHam reviews for switching supplies provides a lot of different opinions for the various products. One in particular, the Jetstream JTPS28, seems to get high marks from its users. Is anyone on the list using this particular supply to power the K3? If so, what are your impressions of its performance? Or should I skip the switching power supply idea altogether? Thanks, Thomas - AC7A _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
RE: Switching supplies and the K3
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I am having very good performance from the SEC 1223 which is the same supply
I use with the K2/100. If it does generate any noise I have yet to hear it. Bruce-W8FU -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Thomas Kuehl Sent: Monday, July 07, 2008 5:24 PM To: [hidden email] Subject: [Elecraft] Switching supplies and the K3 Hi, I am back on the Elecraft list after being gone for quite a while. I have a K3/100 coming in the next month or 2, and now I am thinking about how it is best to power it. The K3 has a nice small footprint and that will be much welcomed in my small operating area. And, I don't want to dwarf the available space with a big linear power supply. Therefore, I am considering a switching power supply with its small size as well. Switching supplies have come a long way relative to the RF hash generation issue and I am considering going that route. I sure don't want to degrade the K3'3 outstanding performance with a noisy supply, so I am still cautious. The eHam reviews for switching supplies provides a lot of different opinions for the various products. One in particular, the Jetstream JTPS28, seems to get high marks from its users. Is anyone on the list using this particular supply to power the K3? If so, what are your impressions of its performance? Or should I skip the switching power supply idea altogether? Thanks, Thomas - AC7A _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com Internal Virus Database is out of date. Checked by AVG. Version: 8.0.101 / Virus Database: 270.4.3/1529 - Release Date: 7/1/2008 7:23 PM _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
RE: Switching supplies and the K3
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Same here. I have two of these supplies, and have yet to hear a
peep of RF noise from them. 73 Stewart G3RXQ On Mon, 7 Jul 2008 21:50:08 -0400, Bruce McLaughlin wrote: > I am having very good performance from the SEC 1223 which is the same supply > I use with the K2/100. If it does generate any noise I have yet to hear it. > > Bruce-W8FU > > -----Original Message----- > From: [hidden email] > [mailto:[hidden email]] On Behalf Of Thomas Kuehl > Sent: Monday, July 07, 2008 5:24 PM > To: [hidden email] > Subject: [Elecraft] Switching supplies and the K3 > > Hi, > > I am back on the Elecraft list after being gone for quite a while. I have a > K3/100 coming in the next month or 2, and now I am thinking about how it is > best to power it. The K3 has a nice small footprint and that will be much > welcomed in my small operating area. And, I don't want to dwarf the > available space with a big linear power supply. Therefore, I am considering > a switching power supply with its small size as well. Switching supplies > have come a long way relative to the RF hash generation issue and I am > considering going that route. I sure don't want to degrade the K3'3 > outstanding performance with a noisy supply, so I am still cautious. > > The eHam reviews for switching supplies provides a lot of different opinions > for the various products. One in particular, the Jetstream JTPS28, seems to > get high marks from its users. Is anyone on the list using this particular > supply to power the K3? If so, what are your impressions of its performance? > Or should I skip the switching power supply idea altogether? > > Thanks, Thomas - AC7A > > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > Internal Virus Database is out of date. > Checked by AVG. > Version: 8.0.101 / Virus Database: 270.4.3/1529 - Release Date: > 7:23 PM > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Re: Switching supplies and the K3
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In reply to this post by Thomas Kuehl
I don't like switchers. I have a Diamond GSV3000 25A linear supply. It is about the same width and depth as the K3, and slightly lower than it when it is up on the tilt bail (which it normally is.) The fan, when it comes on, is just as quiet as those in the K3. It has two meters on the front showing current and voltage. This power supply is also sold by Yaesu as the FP-1030A.
Julian, G4ILO. K2 #392 K3 #222 KX3 #110
* G4ILO's Shack - http://www.g4ilo.com * KComm - http://www.g4ilo.com/kcomm.html * KTune - http://www.g4ilo.com/ktune.html |
Re: Switching supplies and the K3
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Same here - nice quiet PSU. I would buy one again without any hesitation.
Simon Brown, HB9DRV -------------------------------------------------- From: "G4ILO" <[hidden email]> > I don't like switchers. I have a Diamond GSV3000 25A linear supply. _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Thomas Kuehl
Based on my own personal experience, I would recommend a linear supply. I use the Astron RS-35A. Yes, it is as big as the K3, but it is rock solid, well-filtered, and RFI-free, and has over-voltage and over-current protection. In addition, the Astron has heavy-duty output terminals that will better handle the peak current. 5-way binding posts are fine for QRP but I like the larger terminals for QRO. (all IMHO of course). Buy the power supply from R and L Electronics for a low price and quick delivery. (They carry switchers, too).
John W2XS
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In reply to this post by Thomas Kuehl
I bought the Alinco DM-330MW to power my K3. It's pretty small and there's no fan noise and not a peep under load. There are some birdies occasionally but they are the 'wandering' type and drift away very quickly and have never caused any problems; in any case you can tune them away with the 'tune' control on the front panel...... All in all I think this is a pretty good companion to the K3. 73, Stewart Rolfe, GW0ETF (K3 #145) |
Re: Switching supplies and the K3
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In reply to this post by Julian, G4ILO
I have a GSV3000 as well and can confirm the lack of rfi. In my opinion switch mode
supplies have no place anywhere near the ham shack - its bad enough the neighbours having them all over the place but they don't know or care - we should know better. As an aside if anyone has any doubts about whether or not switch mode supplies cause rfi get one of these devices and check it http://www.winradio.co.uk/home/erd.htm I got one some years ago after a tip on the FlexRadio list and its been extremely useful in tracking down sources of interference - just hold it near to a wall wart supply, or usb cable for instance and be astonished with the amount to radiation being generated. The rfi being produced might not be falling directly within the hf ham bands, but, its unwanted radiation nonetheless and is not something you want in or around the shack. 73 to all Trevor G0KTN _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Bruce McLaughlin-2
"Same here. I have two of these supplies, and have yet to hear a
peep of RF noise from them. 73 Stewart G3RXQ "I am having very good performance from the SEC 1223 which is the same supply I use with the K2/100. If it does generate any noise I have yet to hear it. Bruce-W8FU" I'm using a SEC-1235. It is also RF quiet and works well. I modified mine by adding Powerpole connectors to the back, and changed the fan circuitry so that the fan runs at slow speed all the time (still full speed if/when necessary). Info is on my website in the "Equipment Modification" section at www.ad5x.com. Phil - AD5X _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Re: Switching supplies and the K3
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The early Samlex switching power supplies were on the noisy side but they have corrected that problem years ago. I personally use the Samlex SEC 1235M switching supply with my K3 and certainly do not get any noise from it.
73 from Fern VE7GZ with K3 #412 ----- Original Message ----- From: "Phil & Debbie Salas" <[hidden email]> To: <[hidden email]> Sent: Tuesday, July 08, 2008 7:56 AM Subject: [Elecraft] Switching supplies and the K3 "Same here. I have two of these supplies, and have yet to hear a peep of RF noise from them. 73 Stewart G3RXQ "I am having very good performance from the SEC 1223 which is the same supply I use with the K2/100. If it does generate any noise I have yet to hear it. Bruce-W8FU" I'm using a SEC-1235. It is also RF quiet and works well. I modified mine by adding Powerpole connectors to the back, and changed the fan circuitry so that the fan runs at slow speed all the time (still full speed if/when necessary). Info is on my website in the "Equipment Modification" section at www.ad5x.com. Phil - AD5X _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com -- Internal Virus Database is out-of-date. Checked by AVG Free Edition. Version: 7.5.516 / Virus Database: 270.4.3/1528 - Release Date: 7/1/2008 7:26 AM _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Re: Switching supplies and the K3
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In reply to this post by Trevor Smithers
Trevor Smithers wrote:
> supplies have no place anywhere near the ham shack - its bad enough the neighbours > having them all over the place but they don't know or care - we should know better. But we should also know about conversion efficiencies, power factors and power line harmonics! > > As an aside if anyone has any doubts about whether or not switch mode supplies cause > rfi get one of these devices and check it > http://www.winradio.co.uk/home/erd.htm Without a specification for near field sensitivity below a few hundred kHz, its difficult to be sure whether this is measuring anything useful in terms of radiated RFI. -- David Woolley "The Elecraft list is a forum for the discussion of topics related to Elecraft products and more general topics related ham radio" List Guidelines <http://www.elecraft.com/elecraft_list_guidelines.htm> _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
RE: Switching supplies and the K3
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In reply to this post by Thomas Kuehl
Hi Thomas,
I'm not sure what your operating style is but if you are looking for 100w on CW and SSB then I recommend the Gamma Research HPS-1a. I have one and run my K3-100 with it all the time in a portable fashion. Here is a link to Fred's site: http://www.gammaresearch.net/ It has a very small footprint, weighs only 1.25 lbs and has no problem supplying my K3 @ 100w for CW. Fred recommends cutting back to 25 or 30 watts for continuous key down type ops. I've read others who state they run it at 40 watts for PSK ops without problems. Some reviewers commented on the fan and some excessive noise, but I've never been bothered by it at all. It is indeed not as quiet as the K3 fans, but certainly not loud IMO. I've heard no noise or hash on the K3 either. I made a short cable that plugs into the HPS-1a connector (supplied) to APP's to fit the K3. If you're looking for a linear replacement, this may not meet your needs. But for portable or just CW & SSB ops it certainly has worked fine for me. Take care & 73, Dave W8FGU > -----Original Message----- > From: [hidden email] [mailto:elecraft- > [hidden email]] On Behalf Of Thomas Kuehl > Sent: Monday, July 07, 2008 5:24 PM > To: [hidden email] > Subject: [Elecraft] Switching supplies and the K3 > > Hi, > > I am back on the Elecraft list after being gone for quite a while. I have > a K3/100 coming in the next month or 2, and now I am thinking about how it > is best to power it. The K3 has a nice small footprint and that will be > much welcomed in my small operating area. And, I don't want to dwarf the > available space with a big linear power supply. Therefore, I am > considering a switching power supply with its small size as well. > Switching supplies have come a long way relative to the RF hash generation > issue and I am considering going that route. I sure don't want to degrade > the K3'3 outstanding performance with a noisy supply, so I am still > cautious. > > The eHam reviews for switching supplies provides a lot of different > opinions for the various products. One in particular, the Jetstream > JTPS28, seems to get high marks from its users. Is anyone on the list > using this particular supply to power the K3? If so, what are your > impressions of its performance? Or should I skip the switching power > supply idea altogether? > > Thanks, Thomas - AC7A > > > > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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