Brain yes I recall tubes and the multiple power supply requirements. I even designed to a few. I also remember how rough it was to do mobile power supplies where the HV came from either vibrators or dynamotors. Then it was transistors and everything went to 13.85V. But transistor output tanks were never the same because transistor class C tank coils couldn't handle the current so we went to low Q tanks with class B outputs.
Around 2002-2003 there was SAE group called 42Volt. They stated by 2007 that the AC compressor, water pump, and power steering would be electrically driven and therefore the automotive industry must switch to 42 volts (basically three 12v batteries in series). I couldn't wait for 42 volts to work its way into ham radio. By 2007 the group had disbanded. My guess is hybrids killed 42V because they wanted to keep the accessories powered by the engine and not the hybrid battery. The K2 and K3 are dual desktop and mobile radios. Perhaps it is time for a desktop only radio with HV FET finals with a built in power supply. Also a 42V mobile with its own add-on alternator and quiet down converter for the receiver and LEDs. 73 Fred, AE6QL -----Original Message----- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of brian Sent: Friday, October 2, 2015 1:12 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] SS30DV feedback Fred, I'm a fan of higher voltage -- perhaps 24 or 40 volts so that PA transistors can produce cleaner signals. Doing so reduces any IR drop on power supply wiring by a factor of 2 or 3. KISS. IC's are going to lower and lower voltages. Multiple circuits within boxes require a menagerie of voltages. One is faced with having to generate more heat in regulators dropping 40 volts to 12, maybe 5, 3.3 and 1.6 V. Perhaps the era of efficient multivoltage power supplies with multiple wires for multiple voltages will return. (Remember filament ,plate, screen and grid voltage power supplies in days of yore? Guys generally didn't mistakenly hook up the 3500 V B+ wire to the filaments......) 73 de Brian/K3KO On 10/2/2015 19:54 PM, Fred Townsend wrote: > Joe, I am familiar with Kelvin sensing, otherwise known as 4 wire or remote > sensing. Its advantages are probably outweighed by the risks of misconnecting > and filtering needed for RF environments. With <4 feet of 10 ga wire I don't > see significant voltage drops. I prefer KISS. > 73 > Fred, AE6QL > > -----Original Message----- > From: elecraft-boun...@mailman.qth.net > [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Joe Subich, > W4TV > Sent: Friday, October 2, 2015 12:33 PM > To: Eric Swartz - WA6HHQ, Elecraft; elecraft@mailman.qth.net > Subject: Re: [Elecraft] SS30DV feedback > > On 10/2/2015 12:33 PM, Eric Swartz - WA6HHQ, Elecraft wrote: >> The SS30DV has +/- bolt terminals on the rear. The K3S is supplied >> with a power cable using ring lugs for these bolts on one end, and an >> APP connector for the K3S on the other. > Very good! How about remote sensing terminals/connector on the next > iteration of the K3/K3S - ideally on the KPA3 <G>? > > 73, > > ... Joe, W4TV > > > On 10/2/2015 12:33 PM, Eric Swartz - WA6HHQ, Elecraft wrote: >> The SS30DV has +/- bolt terminals on the rear. The K3S is supplied >> with a power cable using ring lugs for these bolts on one end, and an >> APP connector for the K3S on the other. >> >> One other note, at the 100W operating level, we do not see any >> significant voltage drop across the APP conn. >> >> 73, >> >> Eric >> /elecraft.com/ >> >> On 10/2/2015 8:53 AM, Joe Subich, W4TV wrote: >>>> I prefer a PS with black and red connectors so I can connect any >>>> cable and don´t worry about connectors. >>> Quality *bolt* terminals will generally show less voltage drop in >>> transmit than the wiping contacts like PowerPole connectors. That >>> is particularly true when the PowerPoles are not assembled correctly >>> and there is less than full pressure between the wiping contacts. >>> >>> I would prefer any power supply and transceiver with greater than 5A >>> current rating use 1/4" or 3/8" stub bolted connections like the >>> Astron RS-35A/RS-35M and potentially provide a voltage sense >>> connection to support load sensing for supplies that support it or >>> can be modified to support it. >>> >>> 73, >>> >>> ... Joe, W4TV >>> >>> >>> On 10/2/2015 11:33 AM, Jorge Diez - CX6VM wrote: >>>> Hello Matt >>>> >>>> Thanks for the Info. >>>> >>>> I have two SEC-1235M and I hate the terminal screws, I think they >>>> are aluminum and I broke them if removing power cable too much >>>> times >>>> >>>> I prefer a PS with black and red connectors so I can connect any >>>> cable and don´t worry about connectors. >>>> >>>> Thanks! >>>> Jorge >>>> CX6VM/CW5W >>>> >>>> -----Mensaje original----- >>>> De: Matt Zilmer [mailto:mzil...@roadrunner.com] Enviado el: >>>> viernes, >>>> 02 de octubre de 2015 12:13 p.m. >>>> Para: Jorge Diez - CX6VM >>>> CC: elecraft@mailman.qth.net >>>> Asunto: Re: [Elecraft] SS30DV feedback >>>> >>>> Hi Jorge, >>>> >>>> I have both power supplies here - SS30DV and the Samlex SEC1235M. >>>> >>>> Except for the 1235 having voltage and current meters (the SS30 >>>> does not), there is little difference in performance. One thing >>>> that might affect your decision is that the 1235 has an >>>> (internally) adjustable output voltage. >>>> The SS30DV is fixed at 14.1V. >>>> >>>> I run full power with a K3 and with a KX3/KXPA100 with either power >>>> supply, and no isssues found with either one. >>>> >>>> 73, >>>> matt >>>> W6NIA >>>> >>>> On Fri, 2 Oct 2015 09:18:32 -0300, you wrote: >>>> >>>>> Hello >>>>> >>>>> >>>>> >>>>> I will appreciate feedback from users of the SS30DV power supply >>>>> with a >>>>> K3 >>>>> >>>>> >>>>> >>>>> Are you happy with it? With full power on the K3, the SS30DV is >>>>> running comfortable? IS noisy? >>>>> >>>>> >>>>> >>>>> If you compare for example with a Samlex SEC-1235M, what do you think? >>>>> >>>>> >>>>> >>>>> Thanks very much >>>>> >>>>> >>>>> >>>>> 73, >>>>> >>>>> Jorge >>>>> >>>>> CX6VM/CW5W >>>>> >>>>> >>>>> >>>>> --- >>>>> El software de antivirus Avast ha analizado este correo >>>>> electrónico en >>>> busca de virus. >>>>> https://www.avast.com/antivirus >>>>> ______________________________________________________________ >>>>> 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 Message delivered to >>>>> mzil...@roadrunner.com >>>> Matt Zilmer, W6NIA >>>> -- >>>> "Always store beer in a dark place." -R. Heinlein >>>> >>>> >>>> --- >>>> El software de antivirus Avast ha analizado este correo electrónico >>>> en busca de virus. >>>> https://www.avast.com/antivirus >>>> >>>> ______________________________________________________________ >>>> 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 Message delivered to >>>> li...@subich.com >>>> >>> ______________________________________________________________ >>> 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 Message delivered to >>> eric.swa...@elecraft.com >> > ______________________________________________________________ > 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 Message delivered to > fptowns...@earthlink.net > > ______________________________________________________________ > 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 Message delivered to > als...@nc.rr.com > > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 2015.0.6140 / Virus Database: 4435/10742 - Release Date: > 10/02/15 ______________________________________________________________ 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 Message delivered to fptowns...@earthlink.net ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
