[time-nuts] [OT} audiophile outlets.....

Tom Knox actast at hotmail.com
Thu Jun 20 00:54:40 UTC 2013


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: alanh137 at gmail.com
> To: jfor at quikus.com; time-nuts at febo.com
> 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 <jfor at quikus.com> 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: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> > >> Behalf Of Didier Juges
> > >> Sent: Tuesday, June 18, 2013 10:01 PM
> > >> To: nerd at verizon.net; 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 <nerd at verizon.net> 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: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]
> > >>> 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
> > >>> <1371329221.83869.YahooMailNeo at web171902.mail.ir2.yahoo.com>,
> > >>>>> 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 -- time-nuts at febo.com 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 -- time-nuts at febo.com 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 -- time-nuts at febo.com To unsubscribe, go to
> > >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> > >> and follow the instructions there.
> > >>
> > >> _______________________________________________
> > >> time-nuts mailing list -- time-nuts at febo.com
> > >> 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 -- time-nuts at febo.com
> > > To unsubscribe, go to
> > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> > > and follow the instructions there.
> > >
> > >
> >
> >
> > _______________________________________________
> > time-nuts mailing list -- time-nuts at febo.com
> > To unsubscribe, go to
> > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> > and follow the instructions there.
> >
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
 		 	   		  


More information about the Time-nuts_lists.febo.com mailing list