Wallwart for K1
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Hello all,
This is my first posting to the reflector, after purchasing a used K1-4. First let me say how impressed I am with the receiver. Simply amazing! I am now in the process of learning all abt it because in January, I have the oppertunity to operate portable KH6. My question is, can anyone recommend a wallwart to use with the K. One that is free of birdies. I would prefer a linear supply, but if there is a switcher out there that is lnown to be clean, Im willing to use one. Many thanks and hope to work many Q's as N9HF/KH6 as I can. Dave N9HF ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Dave,
Be careful with wallwarts - many of them are unregulated and the output voltage will soar with low current draw. I would suggest a 13.8 volt 3 to 6 amp power supply instead of a wallwart - consider this one from MPJA http://www.mpja.com/138VDC-6A-Benchtop-Power-Supply/productinfo/9323+PS/. An alternative would be a gel cell connected to a smartcharger. The battery will stay topped off and the smartcharger can stay connected to the battery indefinitely. 73, Don W3FPR On 11/13/2011 11:58 AM, David & Linda Kerl wrote: > Hello all, > > This is my first posting to the reflector, after purchasing a used K1-4. > First let me say how impressed I am with the receiver. Simply amazing! > I am now in the process of learning all abt it because in January, I have the > oppertunity to operate portable KH6. > > My question is, can anyone recommend a wallwart to use with the K. One that is > free of birdies. I would prefer a linear supply, but if there is a switcher out > there that is lnown to be clean, Im willing to use one. > Many thanks and hope to work many Q's as N9HF/KH6 as I can. > > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by David & Linda Kerl
On 11/13/2011 8:58 AM, David & Linda Kerl wrote:
> Hello all, > > This is my first posting to the reflector, after purchasing a used K1-4. > First let me say how impressed I am with the receiver. Simply amazing! It really is! Rich, NU6T, and I activated Leviathan Peak for SOTA on Field Day this year, I with my K2 and he with his K1. After a couple of hours, I asked if he'd like to trade rigs for awhile ... I'd run a K1 and in fact, had never seen one. What a fun radio! > > My question is, can anyone recommend a wallwart to use with the K. I would strongly advise against doing this. A number are SMPS designs and can produce a lot of hash [as opposed to discrete "birdies" which can usually be tolerated]. That, however, is not the real problem. Nearly all are completely unregulated and produce fairly high voltages under light loads despite the label reading "12V." The "DC" in the label is also usually a lie. 73, Fred K6DGW - Northern California Contest Club - CU in the 2012 Cal QSO Party 6-7 Oct 2012 - www.cqp.org ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by David & Linda Kerl
HEY! Thanks to all that replied. The answer was right under my nose, er,
fingers. The p.s. for this laptop is ideal. Regulated, 12.5 volts, 2.5 amps. Double duty. There is only so much room in carry-on luggage. On another note. My K1-4 has the KAT1 tuner. I do not have any documentation on its operation, however. Where can I get a copy of it. Mainly, how to use it. Dave N9HF ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by David & Linda Kerl
The most recent issue of QEX contains an article that outlines some
simple filtering that can be applied to a small switcher to remove the birdies inherent in the class. That said, I don't remember ever seeing a "linear" power supply in this low-current application, but there are no doubt some...try e.g. Astron -- I have a couple of their larger linear supplies that are very good. It seems unlikely that you can find a wallwart linear, but there are good wallwart-type supplies with filtering...normally used to provide power for higher-end laptop computers. John Ragle -- W1ZI ===== On 11/13/2011 11:58 AM, David & Linda Kerl wrote: > Hello all, > > This is my first posting to the reflector, after purchasing a used K1-4. > First let me say how impressed I am with the receiver. Simply amazing! > I am now in the process of learning all abt it because in January, I have the > oppertunity to operate portable KH6. > > My question is, can anyone recommend a wallwart to use with the K. One that is > free of birdies. I would prefer a linear supply, but if there is a switcher out > there that is lnown to be clean, Im willing to use one. > Many thanks and hope to work many Q's as N9HF/KH6 as I can. > > Dave > N9HF > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > > > -- Sent from my lovely old Dell XPS 420 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Try www.power-sonic.com
Regards, Mike VP8NO On 13/11/2011 16:06, John Ragle wrote: > The most recent issue of QEX contains an article that outlines some > simple filtering that can be applied to a small switcher to remove the > birdies inherent in the class. That said, I don't remember ever seeing a > "linear" power supply in this low-current application, but there are no > doubt some...try e.g. Astron -- I have a couple of their larger linear > supplies that are very good. It seems unlikely that you can find a > wallwart linear, but there are good wallwart-type supplies with > filtering...normally used to provide power for higher-end laptop computers. > > John Ragle -- W1ZI > > ===== > > On 11/13/2011 11:58 AM, David& Linda Kerl wrote: >> Hello all, >> >> This is my first posting to the reflector, after purchasing a used K1-4. >> First let me say how impressed I am with the receiver. Simply amazing! >> I am now in the process of learning all abt it because in January, I have the >> oppertunity to operate portable KH6. >> >> My question is, can anyone recommend a wallwart to use with the K. One that is >> free of birdies. I would prefer a linear supply, but if there is a switcher out >> there that is lnown to be clean, Im willing to use one. >> Many thanks and hope to work many Q's as N9HF/KH6 as I can. >> >> Dave >> N9HF Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by David & Linda Kerl
Dave wrote:
> The p.s. for this laptop is ideal. Regulated, 12.5 volts, 2.5 amps. > Double duty. There is only so much room in carry-on luggage. Does it have a coaxial DC power plug of the proper size and wiring polarity that allows it to serve either the computer or the K1 without a home-made adapter? Another thing to test whenever you're trying a small DC power supply of unknown internal configuration is the RF noise that it generates. I'm not speaking only of the garbage that comes from most switcher supplies at various frequencies. The power supply for my Samsung cell phone generates a very **broadband** noise across several HF ham bands when the supply is plugged in to the phone for charging. With no load, there is no noise. It pays to test several such conditions. For which bands is your K1 built? Right now band conditions are proving something that I have always claimed as the best of the features of the non-DDS K1 which the KX1 and other simple DDS-based QRP rigs can not offer ...coverage of 15 meters! That's a fantastic QRP band when it is open, which it has been frequently during the past few weeks. It should only get better over the next few years. Congratulations on your K1. 73, Mike / KK5F K1 Serial 175 (November 2000) ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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