K3/0 power
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greetings Elecraft brain trust...
this may sound like a silly question, and I know its sacrilige in most amateur forums, but does anyone know if there is and/or does elecraft support a suitable 12v wall wart that can be used safely to power the K3/0 terminal? I currently use a small astron switcher with it.. With no RF noise worries in the shack (I guess i now call it the terminal facility) I was wondering if I could slim down the install even more for portabilities sake. (of course now I can also put up the old retired plasma tv in the shack to display grey line and spot data without worry of qrn hi hi). thanks~ Chris N6WM ______________________________________________________________ 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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It shouldn't need anything special... use a multimeter to measure how
much current it's drawing from your Astron, and find a 12V wall-wart rated for more than that. 73, ~iain / N6ML On Tue, Feb 26, 2013 at 10:34 AM, Chris Tate - N6WM <[hidden email]> wrote: > greetings Elecraft brain trust... > > this may sound like a silly question, and I know its sacrilige in most amateur forums, but does anyone know if there is and/or does elecraft support a suitable 12v wall wart that can be used safely to power the K3/0 terminal? I currently use a small astron switcher with it.. With no RF noise worries in the shack (I guess i now call it the terminal facility) I was wondering if I could slim down the install even more for portabilities sake. > > (of course now I can also put up the old retired plasma tv in the shack to display grey line and spot data without worry of qrn hi hi). > > thanks~ > > Chris > N6WM > ______________________________________________________________ > 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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Well, it does need something special actually. An unregulated, unfiltered wall wart would not work and potentially could damage the rig! I would look for a small switching unit as they are generally both regulated and filtered What ever you do get, be sure to measure the voltage it puts out before you connect it to the rig. 73 - Mike WA8BXN -------Original Message------- From: iain macdonnell - N6ML Date: 02/26/13 13:41:42 To: Chris Tate - N6WM Cc: [hidden email] Subject: Re: [Elecraft] K3/0 power It shouldn't need anything special... use a multimeter to measure how much current it's drawing from your Astron, and find a 12V wall-wart rated for more than that. 73, ~iain / N6ML ______________________________________________________________ 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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Remember that the K3/0 is not a radio - it's just a ... "terminal device"?
I assume it has a voltage regulator inside, but maybe that's not a valid assumption. We don't seem to have schematics for it.... 73, ~iain / N6ML On Tue, Feb 26, 2013 at 10:55 AM, Mike WA8BXN <[hidden email]> wrote: > > > Well, it does need something special actually. An unregulated, unfiltered > wall wart would not work and potentially could damage the rig! I would look > for a small switching unit as they are generally both regulated and filtered > What ever you do get, be sure to measure the voltage it puts out before you > connect it to the rig. > > 73 - Mike WA8BXN > > > > -------Original Message------- > > From: iain macdonnell - N6ML > Date: 02/26/13 13:41:42 > To: Chris Tate - N6WM > Cc: [hidden email] > Subject: Re: [Elecraft] K3/0 power > > It shouldn't need anything special... use a multimeter to measure how > much current it's drawing from your Astron, and find a 12V wall-wart > rated for more than that. > > 73, > > ~iain / N6ML > 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 Chris Tate - N6WM
If you do use a wall wart, make certain it is a regulated one. Many
wall-warts develop much more than the 'sticker' voltage at no load. You may have to try several of them to find one that does not pollute your station environment with noise. Sorry, but I can't point to any specific ones. Look om www.mpja.com to see if you can find one that you think is suitable. 73, Don W3FPR On 2/26/2013 1:34 PM, Chris Tate - N6WM wrote: > greetings Elecraft brain trust... > > this may sound like a silly question, and I know its sacrilige in most amateur forums, but does anyone know if there is and/or does elecraft support a suitable 12v wall wart that can be used safely to power the K3/0 terminal? I currently use a small astron switcher with it.. With no RF noise worries in the shack (I guess i now call it the terminal facility) I was wondering if I could slim down the install even more for portabilities sake. > ______________________________________________________________ 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 Iain MacDonnell - N6ML-2
They specify 11-15V, that covers a lot of territory! Seems you could get
a 12V 1A unregulated linear adapter and just verify that the no load voltage doesn't exceed 15V, or a 12V switcher which will be inherently regulated. It can't draw more than the 0.9A of a K3/10 on receive. If someone can post actual consumption, that would be nice. I don't see it in the manual. 73, Josh W6XU On 2/26/2013 11:22 AM, iain macdonnell - N6ML wrote: > Remember that the K3/0 is not a radio - it's just a ... "terminal device"? > > I assume it has a voltage regulator inside, but maybe that's not a > valid assumption. We don't seem to have schematics for it.... > > 73, > > ~iain / N6ML > > > On Tue, Feb 26, 2013 at 10:55 AM, Mike WA8BXN <[hidden email]> wrote: >> >> Well, it does need something special actually. An unregulated, unfiltered >> wall wart would not work and potentially could damage the rig! I would look >> for a small switching unit as they are generally both regulated and filtered >> What ever you do get, be sure to measure the voltage it puts out before you >> connect it to the rig. >> >> 73 - Mike WA8BXN >> >> >> >> -------Original Message------- >> >> From: iain macdonnell - N6ML >> Date: 02/26/13 13:41:42 >> To: Chris Tate - N6WM >> Cc: [hidden email] >> Subject: Re: [Elecraft] K3/0 power >> >> It shouldn't need anything special... use a multimeter to measure how >> much current it's drawing from your Astron, and find a 12V wall-wart >> rated for more than that. >> >> 73, >> >> ~iain / N6ML >> > ______________________________________________________________ > 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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The specific issue with unregulated wall warts includes such things as unregulated voltage being applied to the load (K3). This goes to such things as line voltage variations, unloaded to loaded voltage swings, and passing along nasty little additons including but not limited to surges, short term, but very dangerous peak voltages. IF you MUST use an unregulated wall wart, then BEFORE using it to supply power to an expensive piece of equipment, consider two things.What is the cost of repair/replacement of the item to be powered.?What is the cost of curing the cause?
Cost of replacement is real easy to figure, take invoice cost, add shipping, loss of service, price of inconvenience equals answer to first question.Cost of cure is more complicated but almost as easy to arrive at. Add up cost of decent regulator, build time, or cost of decent power supply. Usuallycomes out about the same. But the final question, to me is simple and pretty much theoretical....Why would someone that just spent what a nice K3 or KX3 or ???? wouldn't spend just a few more $$ on a decent power supply, when they are readily available? Have a great day, --... ...-- Dale - WC7S in Wy ______________________________________________________________ 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 Josh Fiden
It shouldn't be difficult to build a small, linear, regulated supply for an amp or so with parts from the local supply house. Packaging it is the greater challenge.
Rick wa6nhc Tiny iPhone 5 keypad, typos are inevitable ______________________________________________________________ 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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On 2/26/2013 20:13, Rick Bates wrote:
It isn't. One needs a 3 amp 18vac AC wall wart, diodes, a few caps an LT1803 adjustable regulator and a few resistors. The use of an AC wall wart eliminates any switching supply concerns. 73 de Brian/K3KO > It shouldn't be difficult to build a small, linear, regulated supply for an amp or so with parts from the local supply house. Packaging it is the greater challenge. > > Rick wa6nhc > > Tiny iPhone 5 keypad, typos are inevitable > ______________________________________________________________ > 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 > > > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 2012.0.2238 / Virus Database: 2641/5634 - Release Date: 02/26/13 > > ----- No virus found in this message. Checked by AVG - www.avg.com Version: 2012.0.2238 / Virus Database: 2641/5634 - Release Date: 02/26/13 ______________________________________________________________ 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 Chris Tate - N6WM
HI Chris:
I can't imagine that the K3/0 draws more than 1A... most likely way less. If so, per Don's suggestion to try Marlin P. Jones.. how about this: <http://www.mpja.com/12-Volt-Power-Supply-1A-Switching-Cui/productinfo/19011%20PS/ > ??? I also assume it uses the "standard" 5.5 by 2.1 mm barrel connector. I can't determine if the linked item is center tip positive or not. 73 de Ray K2ULR On Feb 26, 2013, at 1:34 PM, Chris Tate - N6WM wrote: > greetings Elecraft brain trust... > > this may sound like a silly question, and I know its sacrilige in > most amateur forums, but does anyone know if there is and/or does > elecraft support a suitable 12v wall wart that can be used safely to > power the K3/0 terminal? I currently use a small astron switcher > with it.. With no RF noise worries in the shack (I guess i now > call it the terminal facility) I was wondering if I could slim down > the install even more for portabilities sake. > > (of course now I can also put up the old retired plasma tv in the > shack to display grey line and spot data without worry of qrn hi hi). > > thanks~ > > Chris > N6WM > ______________________________________________________________ > 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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The K3/0 uses, for 12V input, the RCA jack that's normally the 12V
accessory output on a K3. This is not ideal, in that it leaves the "hot" 12V line exposed on the pin of he male RCA plug when it's not connected, but I suppose the intent was to use the existing K3 metalwork. So can anyone confirm whether or not the K3/0 has an internal voltage regulator? 73, ~iain / N6ML On Tue, Feb 26, 2013 at 1:55 PM, Ray Sills <[hidden email]> wrote: > HI Chris: > > I can't imagine that the K3/0 draws more than 1A... most likely way less. > If so, per Don's suggestion to try Marlin P. Jones.. how about this: > > <http://www.mpja.com/12-Volt-Power-Supply-1A-Switching-Cui/productinfo/19011%20PS/> > ??? > > I also assume it uses the "standard" 5.5 by 2.1 mm barrel connector. I > can't determine if the linked item is center tip positive or not. > > > 73 de Ray > K2ULR > > > On Feb 26, 2013, at 1:34 PM, Chris Tate - N6WM wrote: > >> greetings Elecraft brain trust... >> >> this may sound like a silly question, and I know its sacrilige in most >> amateur forums, but does anyone know if there is and/or does elecraft >> support a suitable 12v wall wart that can be used safely to power the K3/0 >> terminal? I currently use a small astron switcher with it.. With no RF >> noise worries in the shack (I guess i now call it the terminal facility) I >> was wondering if I could slim down the install even more for portabilities >> sake. >> >> (of course now I can also put up the old retired plasma tv in the shack to >> display grey line and spot data without worry of qrn hi hi). >> >> thanks~ >> >> Chris >> N6WM >> ______________________________________________________________ >> 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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The K3 front panel power schematic shows three 3-terminal regulators for
8V, 5V and 3.3V. I don't see why they'd use anything other than the front panel. The front panel MCU would run the RS-232 port. I'd probably make a little pigtail from RCA male to 5.5x2.1 barrel female. Then you can use a standard power adapter. As long as you're using a wall wart, I don't think the RCA plug "hot" being exposed is really a concern since it's only hot relative to its ring. 73, Josh W6XU On 2/26/2013 2:22 PM, iain macdonnell - N6ML wrote: > The K3/0 uses, for 12V input, the RCA jack that's normally the 12V > accessory output on a K3. This is not ideal, in that it leaves the > "hot" 12V line exposed on the pin of he male RCA plug when it's not > connected, but I suppose the intent was to use the existing K3 > metalwork. > > So can anyone confirm whether or not the K3/0 has an internal voltage regulator? > > 73, > > ~iain / N6ML > > > On Tue, Feb 26, 2013 at 1:55 PM, Ray Sills <[hidden email]> wrote: >> HI Chris: >> >> I can't imagine that the K3/0 draws more than 1A... most likely way less. >> If so, per Don's suggestion to try Marlin P. Jones.. how about this: >> >> <http://www.mpja.com/12-Volt-Power-Supply-1A-Switching-Cui/productinfo/19011%20PS/> >> ??? >> >> I also assume it uses the "standard" 5.5 by 2.1 mm barrel connector. I >> can't determine if the linked item is center tip positive or not. >> >> >> 73 de Ray >> K2ULR >> >> >> On Feb 26, 2013, at 1:34 PM, Chris Tate - N6WM wrote: >> >>> greetings Elecraft brain trust... >>> >>> this may sound like a silly question, and I know its sacrilige in most >>> amateur forums, but does anyone know if there is and/or does elecraft >>> support a suitable 12v wall wart that can be used safely to power the K3/0 >>> terminal? I currently use a small astron switcher with it.. With no RF >>> noise worries in the shack (I guess i now call it the terminal facility) I >>> was wondering if I could slim down the install even more for portabilities >>> sake. >>> >>> (of course now I can also put up the old retired plasma tv in the shack to >>> display grey line and spot data without worry of qrn hi hi). >>> >>> thanks~ >>> >>> Chris >>> N6WM >>> ______________________________________________________________ >>> 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 > ______________________________________________________________ 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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Jameco is a good source for power supplies of all kinds. You
should be able to find a really small one for K3/0. They are currently running a sale on power products. Here's the information: >Spend $250 or more on power products from Jameco and instantly receive $20 off! Just mention or enter Offer Code PBB32906B when you place your order by March 15, 2013.* > >Take advantage of this month's offer on any of our power products including adapters, power supplies, transformers, converters and more. > >Check out Jameco's complete selection of power products with >the link below. http://links.enews.jameco.com/ctt?kn=6&ms=NDc1ODc1NQS2&r=MjAyMjI2MzM5MDES1&b=2&j=MTQzNzQ0NjE2S0&mt=1&rt=0 I've been using a 15 volt Jameco switching, regulated wall wart for my 20 meter PSK transceiver for several years. No problems what so ever. Cheers - Bill, AE6JV --------------------------------------------------------------------------- Bill Frantz | "I wish there was a knob on the TV to turn up the 408-356-8506 | intelligence. There's a knob called "brightness", but www.pwpconsult.com | it doesn't work. -- Gallagher ______________________________________________________________ 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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This post was updated on .
In reply to this post by Chris Tate - N6WM
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Brgds,
Dave, N3HE Cincinnati OH |
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Thanks all who responded... Appreciate all the feedback.. Thanks Dave for checking this real time. I will likely try something like this.. Would be great to hear an official Elecraft response as well... Eric? ;-)
73 and thanks again to the group Chris N6WM Sent from my iPad On Feb 26, 2013, at 7:01 PM, "David Windisch" <[hidden email]> wrote: > I put another connector on the wallwart which powers the remoterig box in my > shack. It runs cool powering the K3/0 and the rr box. > Yes, I measured current draws, and no, I don't remember what they were, > other than less than the wallwart's capacity. > Brgds, > Dave, N3HE > > > > -- > View this message in context: http://elecraft.365791.n2.nabble.com/K3-0-power-tp7570382p7570410.html > Sent from the Elecraft mailing list archive at Nabble.com. > ______________________________________________________________ > 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 Chris Tate - N6WM
I have checked many of these "wall warts" and unloaded many so called
12v unit output as high as 18v. They seem to be a simple transformer and diode if rated for dc. One way they can safely be used with a varying load is to charge a battery which then powers the electronics. A battery looks like a big capacitor to such supplies and provides a constant load plus filters out ac ripple. Added plus is the equipment is provided with emergency power for short outages. I run my 10-MHz station frequency standard (OCXO) with a wall wart charging a Powersonics 17AH battery. Ensures that the OCXO is not frequency modulated by small ripple voltage, plus the OCXO is stabilized since it runs 24/7. 73, Ed - KL7UW ______________________________________________________________ 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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And that would be a great way to do it Ed, easy on the equipment and with proper fusing, complete protection forthe radio, and the house.
Have a great day, --... ...-- Dale - WC7S in Wy > Date: Tue, 26 Feb 2013 23:49:19 -0900 > To: [hidden email] > From: [hidden email] > Subject: Re: [Elecraft] K3/0 power > > I have checked many of these "wall warts" and unloaded many so called > 12v unit output as high as 18v. They seem to be a simple transformer > and diode if rated for dc. > > One way they can safely be used with a varying load is to charge a > battery which then powers the electronics. A battery looks like a > big capacitor to such supplies and provides a constant load plus > filters out ac ripple. Added plus is the equipment is provided with > emergency power for short outages. > > I run my 10-MHz station frequency standard (OCXO) with a wall wart > charging a Powersonics 17AH battery. Ensures that the OCXO is not > frequency modulated by small ripple voltage, plus the OCXO is > stabilized since it runs 24/7. > > 73, Ed - KL7UW > > ______________________________________________________________ > 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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