Rb or Cs locked 50/60 Hz AC power might still be an available niche although I didn't do much of a search. Alan
On Wed, Jun 19, 2013 at 11:52 AM, J. Forster <[email protected]> wrote: > How about a Rb or Cs standard to control the sampling rate of the DACs in > your CD player so you always have perfect pitch and no wow or flutter? > > Oh, it's already being done and sold to Audiophools.... never mind! > > -John > > ================ > > > > Simple, just think of the next snake oil. There's always more. > > > > > > On 6/18/2013 10:33 PM, Brian, WA1ZMS wrote: > >> What's gets me is that I didn't think of this snake oil first. > >> Had I thought of it first I could own a PTI H-MASER by now. :- ) > >> > >> -Brian, WA1ZMS > >> > >> -----Original Message----- > >> From: [email protected] [mailto:[email protected]] On > >> Behalf Of Didier Juges > >> Sent: Tuesday, June 18, 2013 10:01 PM > >> To: [email protected]; Discussion of precise time and frequency > >> measurement > >> Subject: Re: [time-nuts] HP and other equipment failure > >> > >> "audiophile outlets" > >> > >> You've got to be kidding but not even. > >> > >> At least, nobody is forcing anybody to buy them... > >> > >> Didier > >> > >> Peter Gottlieb <[email protected]> wrote: > >> > >>> The current distortion from simple transformer-rectifier-capacitor > >>> power supplies contains a lot of third harmonic content. In a 3 phase > >>> system (as are all distribution systems for commercial and industrial) > >>> the third harmonic ADDS in the neutral, or creates circulating currents > >>> in a delta configuration. These currents, as you mention, can get very > >>> large and were the cause of many > >>> > >>> transformer explosions in cities as these power supplies became common. > >>> The > >>> transformer designs had to be improved, but the PFC supplies make a big > >>> difference. > >>> > >>> How many of you have looked at the power line waveform, especially in > >>> an industrial or commercial area? Doesn't look much like a sine wave, > >>> does it? So it's pretty funny to see audiophile outlets > >>> (http://www.dedicatedaudio.com/power_outlets). > >>> > >>> Peter > >>> > >>> > >>> > >>> > >>> On 6/15/2013 6:56 PM, stan, W1LE wrote: > >>>> PFC to me is power factor correction, not only the classical power > >>> factor to > >>>> minimize (VAR) volt-amp reactive component, but also to remove the > >>>> harmonic load current imposd on the > >>> electrical power > >>>> system. > >>>> A '90's onward technique. in th 80's and 90's without the harmonic > >>> load > >>>> current reduction and having > >>>> a few 100 end items of equipment, each withtheir own a switch mode > >>> power > >>>> supplly, > >>>> it was not uncommon to find hundreds of amps of the third harmonc on > >>> neutra, > >>>> in the electrical power distribution system. > >>>> > >>>> Could be a serious EMC problem if you were dealing with voice grade > >>> channels. > >>>> And people safety issues. > >>>> > >>>> Stan, W1LE Cape Cod > >>>> > >>>> > >>>> > >>>> On 15-Jun-13 5:52 PM, J. L. Trantham wrote: > >>>>> Sorry for the interruption but what is 'PFC'? > >>>>> > >>>>> Thanks. > >>>>> > >>>>> Joe > >>>>> > >>>>> -----Original Message----- > >>>>> From: [email protected] [mailto:[email protected]] > >>> On > >>>>> Behalf Of Poul-Henning Kamp > >>>>> Sent: Saturday, June 15, 2013 4:09 PM > >>>>> To: Robert Atkinson; Discussion of precise time and frequency > >>> measurement > >>>>> Cc: Perry Sandeen > >>>>> Subject: Re: [time-nuts] HP and other equipment failure > >>>>> > >>>>> In message > >>> <[email protected]>, > >>>>> Robert Atkinson writes: > >>>>> > >>>>>> While I agree with everything else you say, you CAN have too much > >>>>>> filter capacitance. At least where dc rectifier / filter > >>> (smoothing) > >>>>>> circuits are concerned. Increasing C causes increased ripple > >>> current > >>>>>> [...] > >>>>> And ripple current can be a major source of power-line frequency > >>> noise in > >>>>> all electronics. > >>>>> > >>>>> The main reason why switchmode power-supplies today (can) outperform > >>> linear > >>>>> power supplies with respect to noise, is because the legally > >>> mandated PFC > >>>>> correction eliminates the bridge-rectifier ripple harmonics. > >>>>> > >>>>> I would not hessitate to use a good quality switchmode to replace > >>> the linear > >>>>> supply in a HP5370B. > >>>>> > >>>>> I did some experiments a couple of years ago, with an > >>> audio-amplifier: > >>>>> I put a standard PFC corrector chip on the secondary side of the > >>> trafo. > >>>>> The overall result was not satisfactory, but the 50 Hz "sneer" > >>>>> we all know and hate was absent, and the "Tzoing!!!!!" power-on > >>> mechanical > >>>>> shock from the trafo was also eliminated, as was the consequent > >>> dimming of > >>>>> the lights ;-) > >>>>> > >>>>> The main reason not to do this, is that you need some physically > >>> gargantuan > >>>>> coils for a 10A+ PFC-switcher. > >>>>> > >>>>> > >>>> _______________________________________________ > >>>> time-nuts mailing list -- [email protected] To unsubscribe, go to > >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >>>> and follow the instructions there. > >>>> > >>>> > >>>> ----- > >>>> No virus found in this message. > >>>> Checked by AVG - www.avg.com > >>>> Version: 10.0.1432 / Virus Database: 3199/5913 - Release Date: > >>> 06/15/13 > >>>> > >>> _______________________________________________ > >>> time-nuts mailing list -- [email protected] To unsubscribe, go to > >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >>> and follow the instructions there. > >> -- > >> Sent from my Motorola Droid Razr 4G LTE wireless tracker while I do > >> other > >> things. > >> _______________________________________________ > >> time-nuts mailing list -- [email protected] To unsubscribe, go to > >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >> and follow the instructions there. > >> > >> _______________________________________________ > >> time-nuts mailing list -- [email protected] > >> To unsubscribe, go to > >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >> and follow the instructions there. > >> > >> > >> ----- > >> No virus found in this message. > >> Checked by AVG - www.avg.com > >> Version: 10.0.1432 / Virus Database: 3199/5921 - Release Date: 06/18/13 > >> > >> > > > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > > > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
