I wonder what is the best way to obtain 44.1KHz from a 5-10MHz reference. Thomas Knox
> Date: Wed, 19 Jun 2013 15:14:17 -0600 > From: [email protected] > To: [email protected]; [email protected] > Subject: Re: [time-nuts] [OT} audiophile outlets..... > > 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. _______________________________________________ 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.
