Power Supply?
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phil> Isn't the RS-20M a linear power supply?
Correct, linear. Again I'm not sure if it can be crammed into a P3 enclosure, but come Friday, I'll know :) I too despise noisy fans. I'd pick one carefully! --Andrew, NV1B .. ______________________________________________________________ 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 ac0h
AC0H> I really don't understand the hubbub about having a matching
power supply ... AC0H> I just don't see it. A power supply is a power supply. They are commodity items. Simply a desire to have one match the rest of the station. I like that Elecraft made the K3, P3 and KPA500 match. They put considerable effort into that design, and did so deliberately, and it works. Some people care about aesthetics, and some don't. Kudos to all of them; to each his own. --Andrew, NV1B .. ______________________________________________________________ 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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When I got my Icom 756 Pro III about six years ago or so, the Icom PS125 was part of the deal. HRO (or, Icom) was offering the PS125 as a free add-on to the Pro III purchase.
I thought that was cool because of the common look&feel of the two sitting side-by-side. But, that feeling lasted only a few days when I started being bothered by the fan. Until then, I really had no fan noise problems. I complained to HRO thinking that I got a lemon but they assured me that the noise I was hearing was likely normal as they have noisy fans there in their rig setup at the store. So, eBay came to the rescue and I sold the PS125 for $150. I am not sure if the buyer got a deal or not given that it was roughly half the retail price and less then a month old and yet it was noisy too. But, he never complained to me. As for me, I have two nice Astron RS-35M linear supplies and they are nice and quiet. Plus, since I moved them under the bench on a little shelf of their own, I never really know that they are there. I have two nice DC distribution panels up on the bench top for my rigs to feed from the power supplies. 73, phil, K7PEH On Jul 2, 2011, at 3:24 PM, Andrew Moore wrote: > AC0H> I really don't understand the hubbub about having a matching > power supply > ... > AC0H> I just don't see it. A power supply is a power supply. They > are commodity items. > > Simply a desire to have one match the rest of the station. I like that > Elecraft made the K3, P3 and KPA500 match. They put considerable effort > into that design, and did so deliberately, and it works. Some people care > about aesthetics, and some don't. Kudos to all of them; to each his own. > > --Andrew, NV1B > .. > ______________________________________________________________ > 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 ______________________________________________________________ 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 Andrew Moore-3
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You know, I like a good Martini occasionally when I am one the air. Why can't a good mixer be built in the K3 enclosure. Also the guys should include an computer that can log contacts and have good voice recognition so the K3 can do contacts automatically. Then all you would have to do is turn on radio have it scan your favorite frequency and talk to your buddies. Then I could go out with my wife and enjoy and evening with her and my Martin
......EH! Love my two K3s George, W6GF --- On Sat, 7/2/11, Ron D'Eau Claire <[hidden email]> wrote: From: Ron D'Eau Claire <[hidden email]> Subject: Re: [Elecraft] Power Supply? To: "'Andrew Moore'" <[hidden email]>, "'Phil Hystad'" <[hidden email]> Cc: Date: Saturday, July 2, 2011, 4:03 PM I have an Astron 20M and IIRC the transformer alone is bigger than the P3 enclosure. And then there's the big finned heat sink hanging on the back (the reason it doesn't need a fan). If you can squeeze the transformer in the enclosure and find somewhere to mount the regulator circuit, the heat sink might fit on the top of the P3, giving it a sort of "Jurassic" look :-) But there's another important issue beyond size - the magnetic field. Linear supplies are electrically quiet but very *noisy*, magnetically. The strong 60 Hz magnetic field can wreak havoc in many nearby devices and circuits. Extensive magnetic shielding is normally employed when a large transformer in near sensitive circuits - normally very heavy and bulky for larger transformers and still not completely effective. Ron AC7AC -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Andrew Moore Sent: Saturday, July 02, 2011 3:19 PM To: Phil Hystad Cc: Elecraft Subject: Re: [Elecraft] Power Supply? phil> Isn't the RS-20M a linear power supply? Correct, linear. Again I'm not sure if it can be crammed into a P3 enclosure, but come Friday, I'll know :) I too despise noisy fans. I'd pick one carefully! --Andrew, NV1B .. ______________________________________________________________ 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 ______________________________________________________________ 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 ______________________________________________________________ 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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A beer bottle opener would be nice as well :-)
73, Tony W7GO On 7/2/2011 4:54 PM, george fritkin wrote: > You know, I like a good Martini occasionally when I am one the air. Why can't a good mixer be built in the K3 enclosure. Also the guys should include an computer that can log contacts and have good voice recognition so the K3 can do contacts automatically. Then all you would have to do is turn on radio have it scan your favorite frequency and talk to your buddies. Then I could go out with my wife and enjoy and evening with her and my Martin > ......EH! > Love my two K3s > George, W6GF > - ______________________________________________________________ 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 ac0h
Agreed Kevin!
Personally I would prefer that the brilliant minds in Watsonville (and various other "skunkworks" sites) spend their necessarily limited resources working on Elecraft type projects (improving and updating and perfecting the K2, K3, P3, KPA500, KAT500 etc.) and whatever back room projects they have on the fire than spending their time producing products such as power supplies, which, in my case, sit on the floor out of sight and just - supply power. Actually, I am amazed at their ability to have so many balls in the air without apparently dropping any! Rick K6LE On 7/2/2011, at 3:00 , R. Kevin Stover wrote: > I really don't understand the hubbub about having a matching power > supply. Mine has never matched any radio hooked up to it and it sits on > the floor. > > I'd hope Elecraft wouldn't waste time and resources on trying to > re-invent the pretty much perfected power supply wheel unless they can > make a quantum leap in power supply performance, like they did with > receiver performance on the K2 and 3. > > I just don't see it. A power supply is a power supply. They are > commodity items. > > Someone thinks they're going to shoehorn the guts of an RS-20M into a > P3? Good luck! I don't think the transformer would fit much less the > heat sink. > > > > -- > R. Kevin Stover > AC0H > _______________________ 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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AC0H> Someone thinks they're going to shoehorn the guts of an RS-20M into
a P3? Good luck! I don't think the transformer would fit much less the heat sink. Have a look inside one then. The transformer is 3.75 inches tall, by 4.0 by 4.5. The PCB with caps, etc. is 2" tall, by 3.75 by 3 by 3.75. (though I'm not suggesting we ignore the need for proper air circulation). You area correct about the heat sink - it appears to be the only part that's too big and needs hacking. But that's why we're "amateurs." AC0H> I'd hope Elecraft wouldn't waste time and resources on trying to re-invent the pretty much perfected power supply Agreed. Not what I'm asking for - just a blank P3. But it looks like the real P3 has plenty room for this project. --Andrew, NV1B .. ______________________________________________________________ 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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