Re: [Elecraft] laptop power supply to power KX3
I have used the same supply with my K2 at 10 watts with no issues. Bob N7XY On Sep 18, 2012, at 10:26 PM, Bill Tubbs wrote: > Yeah, I spoke before doing the math. As Don said, the math is simple. P=EI. > Or, I=P/E. So, I don't know what the KX3 input is but if we say it's 20 > watts, 20/12=1.67 amps. Clearly the MFJ should handle the KX3 at full power, > at least for non-data modes. Thanks for shaking my cobwebs loose! > > Bill > WK6A > > Sent from my iPhone > > On Sep 18, 2012, at 5:06 PM, "Phil&Debbie" wrote: > >> “After sending my note about using the little MFJ power supply at 2.89 amps, >> I realized that it works fine on my FT-817D at 5 watts but would obviously >> be taxed at the full 12 watts of the KX3. So fuggetabowdit.” >> >> The MFJ supply will power the KX3 just fine at 10 watts. The KX3 draws >> about 2-amps at 10 watts. I used the little MFJ supply (which is rated at >> 2.8 amps) to power my IC-703 which also put out 10 watts at about 2-amps. >> >> Phil – AD5X >> >> __ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:Elecraft@mailman.qth.net >> >> 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:Elecraft@mailman.qth.net > > 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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] laptop power supply to power KX3
To optimise the size of the supply to the load, one could examine the rms current draw v peak current draw. It might only be a case of fitting a large capacitor close to the radio (perhaps in a tiny box or heat shrunk "speed bump" in the cable) to supply those current peaks from a very small supply. This technique is used in some supplies that use super-capacitors and a small switchmode for 100W transceivers. This has the advantage of creating much lower switching noise which is easier/smaller/cheaper to filter out. David G3UNA __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] laptop power supply to power KX3
Yeah, I spoke before doing the math. As Don said, the math is simple. P=EI. Or, I=P/E. So, I don't know what the KX3 input is but if we say it's 20 watts, 20/12=1.67 amps. Clearly the MFJ should handle the KX3 at full power, at least for non-data modes. Thanks for shaking my cobwebs loose! Bill WK6A Sent from my iPhone On Sep 18, 2012, at 5:06 PM, "Phil&Debbie" wrote: > “After sending my note about using the little MFJ power supply at 2.89 amps, > I realized that it works fine on my FT-817D at 5 watts but would obviously > be taxed at the full 12 watts of the KX3. So fuggetabowdit.” > > The MFJ supply will power the KX3 just fine at 10 watts. The KX3 draws > about 2-amps at 10 watts. I used the little MFJ supply (which is rated at > 2.8 amps) to power my IC-703 which also put out 10 watts at about 2-amps. > > Phil – AD5X > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > 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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] laptop power supply to power KX3
On 19/09/2012, at 9:08 AM, Don Wilhelm wrote: > I detect that there are many monitoring this thread who do not > understand the voltage, current. power relationship as it relates to > DC. Perhaps these links will help those people: http://gsuryalss.wordpress.com/tag/ohm-amp-volt/ http://xkcd.com/643/ 73, Matt VK2ACL __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] laptop power supply to power KX3
The specs say the KX3 current draw is typically one to two amps when transmitting, so your 2.89 amp PS should do fine. Dave, K9SW On Sep 18, 2012, at 3:53 PM, Bill Tubbs wrote: > After sending my note about using the little MFJ power supply at 2.89 amps, I > realized that it works fine on my FT-817D at 5 watts but would obviously be > taxed at the full 12 watts of the KX3. So fuggetabowdit. > > Now I'M looking for a sufficient supply for the KX3 ;-) > > Bill > WK6A > > Sent from my iPhone > > On Sep 18, 2012, at 4:44 AM, Johnny wrote: > >> Yes , correct , laptop supplies are often RF noisy. >> >> Sent from my iPhone 4 >> >> "Fred Townsend" 於 2012年9月18日 下午2:04 寫道： >> >>> Jeff, caution. Laptop power external supplies are designed to be followed >>> by precision internal regulators that handle the logic voltages and charging >>> the battery. The external supplies are not well regulated and can be quite >>> noisy. They may not be the best supplies for ham rigs. >>> 73 >>> Fred, AE6QL >>> >>> -Original Message- >>> From: elecraft-boun...@mailman.qth.net >>> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jeff Herr >>> Sent: Monday, September 17, 2012 6:40 PM >>> To: 'Elecraft Reflector' >>> Subject: [Elecraft] laptop power supply to power KX3 >>> >>> While at work I went through our stock of power supplies for the various >>> makes of laptops we use. >>> I found that Toshiba supplies are specified 15v and ranged in current >>> capability from 2.5 amps and up. >>> >>> Dell, Lenovo, HP, Acer, Asus all use 19v supplies. >>> >>> Those Toshiba supplies are very small. >>> >>> WW6L >>> >>> >>> __ >>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:Elecraft@mailman.qth.net >>> >>> 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:Elecraft@mailman.qth.net >>> >>> 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:Elecraft@mailman.qth.net >> >> 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:Elecraft@mailman.qth.net > > 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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] laptop power supply to power KX3
When in AZ, I run the KX3 with a 3 Amp RS supply. I have seen no problems with it. At one time I had 4 or 5 of these little supplies but down to 2 or 3 now. gave the others away! I bought them several years ago and have used them for many items, including my NorCal 40a, a couple of the MFJ CW rigs and etc. Like the old Timex commercial, they just keep on ticking! OK, back in my hole, Ron, KU7Y SOWP 5545M Arizona Outlaws Contest Club Brenda, AZ (Winter) Caldwell, ID (Summer) k...@qsl.net http://www.hatpinsandmore.com KX3 #0062 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] laptop power supply to power KX3
“After sending my note about using the little MFJ power supply at 2.89 amps, I realized that it works fine on my FT-817D at 5 watts but would obviously be taxed at the full 12 watts of the KX3. So fuggetabowdit.” The MFJ supply will power the KX3 just fine at 10 watts. The KX3 draws about 2-amps at 10 watts. I used the little MFJ supply (which is rated at 2.8 amps) to power my IC-703 which also put out 10 watts at about 2-amps. Phil – AD5X __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] laptop power supply to power KX3
Bill, If it sits on the floor, what is the problem. No meters in your face, just good DC power provided to the rigrunner. The fuse sets the current supplied to the transceiver. The KX3 will only draw 3 amps on transmit at full power. The maximum current available from the power supply has no meaning other that the requirements of the load cannot exceed the power supply ratings. In other words, one cannot power a 100 watt amplifier from a 6 ampere power supply. I detect that there are many monitoring this thread who do not understand the voltage, current. power relationship as it relates to DC. I do not want to enlighten all, but some of the questions have gone below the level that all radio amateurs should understand from basic principles of Ohms Law - some of the most fundamental equations relating voltage, current, and power. If there is not a basic understanding of those parameters, there is a great communications loss. I am sorry, but I cannot "spoon feed" those who do not have a grasp of those basic electrical parameters. If it was not on your amateur radio exam, then you can find it in the ARRL Handbook Electrical Laws and Circuits chapter. It is simple - voltage equals current times resistance, Power equals voltage times current - fundamental formulas, but I feel that many hams do not have any concept of those parameters - this is basic, entry level stuff. 73, Don W3FPR On 9/18/2012 6:40 PM, Bill Tubbs wrote: > I actually have a 20-amp Astron, as well as a 20-amp Icom supply, but I was > hoping for something in the middle. If I were just going to consider using > only the KX3 i suppose a 6-7 Amp supply would do the trick, and I would think > it might be no bigger than the KX3 itself, no? > > Bill > WK6A > > Sent from my iPhone > > On Sep 18, 2012, at 2:16 PM, Don Wilhelm wrote: > >> Bill, >> >> I would suggest an Astron 20 amp supply (or even the 35 amp linear). Yes, >> it is overkill for the 12 watt KX3, but that is no problem, the current will >> not exceed what the connected device (the KX3) needs even though the supply >> is capable of much more current. When you also have the KXPA3, you will need >> that extra current. You also have other 12 volt powered devices around the >> shack, so the extra current rating will help with powering those devices. >> >> For those who want to homebrew for the basic KX3, I suggest you look at the >> article in QST from November 1993 page 27 for a 5 amp regulated 13.8 volt 5 >> amp power supply with crowbar overvoltage protection. We are hams, so think >> "build your own" It is a good philisophy/ >> >> 73, >> Don W3FPR >> >> On 9/18/2012 4:53 PM, Bill Tubbs wrote: >>> After sending my note about using the little MFJ power supply at 2.89 amps, >>> I realized that it works fine on my FT-817D at 5 watts but would obviously >>> be taxed at the full 12 watts of the KX3. So fuggetabowdit. >>> >>> Now I'M looking for a sufficient supply for the KX3 ;-) >>> >>> Bill >>> WK6A >>> >>> Sent from my iPhone >>> >>> On Sep 18, 2012, at 4:44 AM, Johnny wrote: >>> >>>> Yes , correct , laptop supplies are often RF noisy. >>>> >>>> Sent from my iPhone 4 >>>> >>>> "Fred Townsend" 於 2012年9月18日 下午2:04 寫道： >>>> >>>>> Jeff, caution. Laptop power external supplies are designed to be followed >>>>> by precision internal regulators that handle the logic voltages and >>>>> charging >>>>> the battery. The external supplies are not well regulated and can be quite >>>>> noisy. They may not be the best supplies for ham rigs. >>>>> 73 >>>>> Fred, AE6QL >>>>> >>>>> -Original Message- >>>>> From: elecraft-boun...@mailman.qth.net >>>>> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jeff Herr >>>>> Sent: Monday, September 17, 2012 6:40 PM >>>>> To: 'Elecraft Reflector' >>>>> Subject: [Elecraft] laptop power supply to power KX3 >>>>> >>>>> While at work I went through our stock of power supplies for the various >>>>> makes of laptops we use. >>>>> I found that Toshiba supplies are specified 15v and ranged in current >>>>> capability from 2.5 amps and up. >>>>> >>>>> Dell, Lenovo, HP, Acer, Asus all use 19v supplies. >>>>> >>>>> Those Toshiba supplies are very small. >>>>> >>>>> WW6
Re: [Elecraft] laptop power supply to power KX3
I actually have a 20-amp Astron, as well as a 20-amp Icom supply, but I was hoping for something in the middle. If I were just going to consider using only the KX3 i suppose a 6-7 Amp supply would do the trick, and I would think it might be no bigger than the KX3 itself, no? Bill WK6A Sent from my iPhone On Sep 18, 2012, at 2:16 PM, Don Wilhelm wrote: > Bill, > > I would suggest an Astron 20 amp supply (or even the 35 amp linear). Yes, it > is overkill for the 12 watt KX3, but that is no problem, the current will not > exceed what the connected device (the KX3) needs even though the supply is > capable of much more current. When you also have the KXPA3, you will need > that extra current. You also have other 12 volt powered devices around the > shack, so the extra current rating will help with powering those devices. > > For those who want to homebrew for the basic KX3, I suggest you look at the > article in QST from November 1993 page 27 for a 5 amp regulated 13.8 volt 5 > amp power supply with crowbar overvoltage protection. We are hams, so think > "build your own" It is a good philisophy/ > > 73, > Don W3FPR > > On 9/18/2012 4:53 PM, Bill Tubbs wrote: >> After sending my note about using the little MFJ power supply at 2.89 amps, >> I realized that it works fine on my FT-817D at 5 watts but would obviously >> be taxed at the full 12 watts of the KX3. So fuggetabowdit. >> >> Now I'M looking for a sufficient supply for the KX3 ;-) >> >> Bill >> WK6A >> >> Sent from my iPhone >> >> On Sep 18, 2012, at 4:44 AM, Johnny wrote: >> >>> Yes , correct , laptop supplies are often RF noisy. >>> >>> Sent from my iPhone 4 >>> >>> "Fred Townsend" 於 2012年9月18日 下午2:04 寫道： >>> >>>> Jeff, caution. Laptop power external supplies are designed to be followed >>>> by precision internal regulators that handle the logic voltages and >>>> charging >>>> the battery. The external supplies are not well regulated and can be quite >>>> noisy. They may not be the best supplies for ham rigs. >>>> 73 >>>> Fred, AE6QL >>>> >>>> -Original Message- >>>> From: elecraft-boun...@mailman.qth.net >>>> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jeff Herr >>>> Sent: Monday, September 17, 2012 6:40 PM >>>> To: 'Elecraft Reflector' >>>> Subject: [Elecraft] laptop power supply to power KX3 >>>> >>>> While at work I went through our stock of power supplies for the various >>>> makes of laptops we use. >>>> I found that Toshiba supplies are specified 15v and ranged in current >>>> capability from 2.5 amps and up. >>>> >>>> Dell, Lenovo, HP, Acer, Asus all use 19v supplies. >>>> >>>> Those Toshiba supplies are very small. >>>> >>>> WW6L >>>> >>>> >>>> __ >>>> Elecraft mailing list >>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>>> Help: http://mailman.qth.net/mmfaq.htm >>>> Post: mailto:Elecraft@mailman.qth.net >>>> >>>> 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:Elecraft@mailman.qth.net >>>> >>>> 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:Elecraft@mailman.qth.net >>> >>> 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:Elecraft@mailman.qth.net >> >> 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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] laptop power supply to power KX3
Bill, I would suggest an Astron 20 amp supply (or even the 35 amp linear). Yes, it is overkill for the 12 watt KX3, but that is no problem, the current will not exceed what the connected device (the KX3) needs even though the supply is capable of much more current. When you also have the KXPA3, you will need that extra current. You also have other 12 volt powered devices around the shack, so the extra current rating will help with powering those devices. For those who want to homebrew for the basic KX3, I suggest you look at the article in QST from November 1993 page 27 for a 5 amp regulated 13.8 volt 5 amp power supply with crowbar overvoltage protection. We are hams, so think "build your own" It is a good philisophy/ 73, Don W3FPR On 9/18/2012 4:53 PM, Bill Tubbs wrote: > After sending my note about using the little MFJ power supply at 2.89 amps, I > realized that it works fine on my FT-817D at 5 watts but would obviously be > taxed at the full 12 watts of the KX3. So fuggetabowdit. > > Now I'M looking for a sufficient supply for the KX3 ;-) > > Bill > WK6A > > Sent from my iPhone > > On Sep 18, 2012, at 4:44 AM, Johnny wrote: > >> Yes , correct , laptop supplies are often RF noisy. >> >> Sent from my iPhone 4 >> >> "Fred Townsend" 於 2012年9月18日 下午2:04 寫道： >> >>> Jeff, caution. Laptop power external supplies are designed to be followed >>> by precision internal regulators that handle the logic voltages and charging >>> the battery. The external supplies are not well regulated and can be quite >>> noisy. They may not be the best supplies for ham rigs. >>> 73 >>> Fred, AE6QL >>> >>> -Original Message- >>> From: elecraft-boun...@mailman.qth.net >>> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jeff Herr >>> Sent: Monday, September 17, 2012 6:40 PM >>> To: 'Elecraft Reflector' >>> Subject: [Elecraft] laptop power supply to power KX3 >>> >>> While at work I went through our stock of power supplies for the various >>> makes of laptops we use. >>> I found that Toshiba supplies are specified 15v and ranged in current >>> capability from 2.5 amps and up. >>> >>> Dell, Lenovo, HP, Acer, Asus all use 19v supplies. >>> >>> Those Toshiba supplies are very small. >>> >>> WW6L >>> >>> >>> __ >>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:Elecraft@mailman.qth.net >>> >>> 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:Elecraft@mailman.qth.net >>> >>> 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:Elecraft@mailman.qth.net >> >> 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:Elecraft@mailman.qth.net > > 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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] laptop power supply to power KX3
After sending my note about using the little MFJ power supply at 2.89 amps, I realized that it works fine on my FT-817D at 5 watts but would obviously be taxed at the full 12 watts of the KX3. So fuggetabowdit. Now I'M looking for a sufficient supply for the KX3 ;-) Bill WK6A Sent from my iPhone On Sep 18, 2012, at 4:44 AM, Johnny wrote: > Yes , correct , laptop supplies are often RF noisy. > > Sent from my iPhone 4 > > "Fred Townsend" 於 2012年9月18日 下午2:04 寫道： > >> Jeff, caution. Laptop power external supplies are designed to be followed >> by precision internal regulators that handle the logic voltages and charging >> the battery. The external supplies are not well regulated and can be quite >> noisy. They may not be the best supplies for ham rigs. >> 73 >> Fred, AE6QL >> >> -Original Message- >> From: elecraft-boun...@mailman.qth.net >> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jeff Herr >> Sent: Monday, September 17, 2012 6:40 PM >> To: 'Elecraft Reflector' >> Subject: [Elecraft] laptop power supply to power KX3 >> >> While at work I went through our stock of power supplies for the various >> makes of laptops we use. >> I found that Toshiba supplies are specified 15v and ranged in current >> capability from 2.5 amps and up. >> >> Dell, Lenovo, HP, Acer, Asus all use 19v supplies. >> >> Those Toshiba supplies are very small. >> >> WW6L >> >> >> __ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:Elecraft@mailman.qth.net >> >> 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:Elecraft@mailman.qth.net >> >> 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:Elecraft@mailman.qth.net > > 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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] laptop power supply to power KX3
Thinkpad used on T32C and others. David G3UNA - Original Message - From: "Jon K Hellan" To: Sent: Tuesday, September 18, 2012 11:56 AM Subject: Re: [Elecraft] laptop power supply to power KX3 > On 09/18/2012 01:44 PM, Johnny wrote: >> Yes , correct , laptop supplies are often RF noisy. > > Any particular laptop and laptop supply brands favoured by dxpeditions? > > Jon LA4RT > >> >> Sent from my iPhone 4 >> >> "Fred Townsend" 於 2012年9月18日 下午2:04 寫道： >> >> >>> Jeff, caution. Laptop power external supplies are designed to be >>> followed >>> by precision internal regulators that handle the logic voltages and >>> charging >>> the battery. The external supplies are not well regulated and can be >>> quite >>> noisy. They may not be the best supplies for ham rigs. >>> 73 >>> Fred, AE6QL >>> >>> -Original Message- >>> From: elecraft-boun...@mailman.qth.net >>> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jeff Herr >>> Sent: Monday, September 17, 2012 6:40 PM >>> To: 'Elecraft Reflector' >>> Subject: [Elecraft] laptop power supply to power KX3 >>> >>> While at work I went through our stock of power supplies for the various >>> makes of laptops we use. >>> I found that Toshiba supplies are specified 15v and ranged in current >>> capability from 2.5 amps and up. >>> >>> Dell, Lenovo, HP, Acer, Asus all use 19v supplies. >>> >>> Those Toshiba supplies are very small. >>> >>> WW6L >>> >>> >>> __ >>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:Elecraft@mailman.qth.net >>> >>> 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:Elecraft@mailman.qth.net >>> >>> 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:Elecraft@mailman.qth.net >> >> 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:Elecraft@mailman.qth.net > > 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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] laptop power supply to power KX3
On 09/18/2012 01:44 PM, Johnny wrote: > Yes , correct , laptop supplies are often RF noisy. Any particular laptop and laptop supply brands favoured by dxpeditions? Jon LA4RT > > Sent from my iPhone 4 > > "Fred Townsend" 於 2012年9月18日 下午2:04 寫道： > >> Jeff, caution. Laptop power external supplies are designed to be followed >> by precision internal regulators that handle the logic voltages and charging >> the battery. The external supplies are not well regulated and can be quite >> noisy. They may not be the best supplies for ham rigs. >> 73 >> Fred, AE6QL >> >> -Original Message- >> From: elecraft-boun...@mailman.qth.net >> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jeff Herr >> Sent: Monday, September 17, 2012 6:40 PM >> To: 'Elecraft Reflector' >> Subject: [Elecraft] laptop power supply to power KX3 >> >> While at work I went through our stock of power supplies for the various >> makes of laptops we use. >> I found that Toshiba supplies are specified 15v and ranged in current >> capability from 2.5 amps and up. >> >> Dell, Lenovo, HP, Acer, Asus all use 19v supplies. >> >> Those Toshiba supplies are very small. >> >> WW6L >> >> >> __ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:Elecraft@mailman.qth.net >> >> 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:Elecraft@mailman.qth.net >> >> 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:Elecraft@mailman.qth.net > > 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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] laptop power supply to power KX3
Yes , correct , laptop supplies are often RF noisy. Sent from my iPhone 4 "Fred Townsend" 於 2012年9月18日 下午2:04 寫道： > Jeff, caution. Laptop power external supplies are designed to be followed > by precision internal regulators that handle the logic voltages and charging > the battery. The external supplies are not well regulated and can be quite > noisy. They may not be the best supplies for ham rigs. > 73 > Fred, AE6QL > > -Original Message- > From: elecraft-boun...@mailman.qth.net > [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jeff Herr > Sent: Monday, September 17, 2012 6:40 PM > To: 'Elecraft Reflector' > Subject: [Elecraft] laptop power supply to power KX3 > > While at work I went through our stock of power supplies for the various > makes of laptops we use. > I found that Toshiba supplies are specified 15v and ranged in current > capability from 2.5 amps and up. > > Dell, Lenovo, HP, Acer, Asus all use 19v supplies. > > Those Toshiba supplies are very small. > > WW6L > > > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > 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:Elecraft@mailman.qth.net > > 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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] laptop power supply to power KX3
Jeff, caution. Laptop power external supplies are designed to be followed by precision internal regulators that handle the logic voltages and charging the battery. The external supplies are not well regulated and can be quite noisy. They may not be the best supplies for ham rigs. 73 Fred, AE6QL -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jeff Herr Sent: Monday, September 17, 2012 6:40 PM To: 'Elecraft Reflector' Subject: [Elecraft] laptop power supply to power KX3 While at work I went through our stock of power supplies for the various makes of laptops we use. I found that Toshiba supplies are specified 15v and ranged in current capability from 2.5 amps and up. Dell, Lenovo, HP, Acer, Asus all use 19v supplies. Those Toshiba supplies are very small. WW6L __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net 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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] laptop power supply to power KX3
While at work I went through our stock of power supplies for the various makes of laptops we use. I found that Toshiba supplies are specified 15v and ranged in current capability from 2.5 amps and up. Dell, Lenovo, HP, Acer, Asus all use 19v supplies. Those Toshiba supplies are very small. WW6L __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
