Hi Ok, let's put some numbers on this:
1) The original post was about an OCXO (as opposed to a VCXO or VCO). 2) One would *assume* that only stable OCXO's are of interest to this group… :)…. 3) Single ovens with 1x10^-9 per percent delta V are "not so stable", parts with 1x10^-11 per percent are quite possible. 4) Supply voltages around 12 volts are pretty common 5) < 1.0x10^-13 at one second is doing pretty good on an OCXO >From that one can do some math. One percent of 12 volts is 120 mv. One mv will be < 1.0x10^-11 on the "not so stable" OCXO and < 1.0X10^-14 on the stable one. Is your supply good to 1 mv? Most of my lab supplies are. If so, that's probably good enough. If you have a poor supply, many common 3 terminal regulators are amazingly stable under normal lab conditions. I *know* that my batteries aren't stable to 1 mv over days with an OCXO pulling current off of them. Regulator changes voltage with temperature? So do batteries and OCXO's and lab supplies. Bob On Jul 11, 2013, at 3:39 PM, Max Robinson <[email protected]> wrote: > Ed. I for one am getting all of your messages. Perhaps your spam filter is > taking them out for some reason. > > Regards. > > Max. K 4 O DS. > > Email: [email protected] > > Transistor site http://www.funwithtransistors.net > Vacuum tube site: http://www.funwithtubes.net > Woodworking site > http://www.angelfire.com/electronic/funwithtubes/Woodworking/wwindex.html > Music site: http://www.maxsmusicplace.com > > To subscribe to the fun with transistors group send an email to. > [email protected] > > To subscribe to the fun with tubes group send an email to, > [email protected] > > To subscribe to the fun with wood group send a blank email to > [email protected] > > ----- Original Message ----- From: "ed breya" <[email protected]> > To: <[email protected]> > Sent: Thursday, July 11, 2013 11:39 AM > Subject: Re: [time-nuts] Lead acid battery noise levels > > >> Third attempt at emailing again: >> >> NiCd batteries should have the lowest noise for their size due to low >> resistance, but if you look at ever-lower frequency, the Hg should be >> superior since it has the most stable voltage with time and temperature. >> Drift (including self-discharge) and temperature variation response can >> appear as very low frequency noise independent of the other noise sources >> and operating conditions. Hg batteries are so stable that they were commonly >> used as voltage references or to power small circuits without any additional >> regulation needed. >> >> Ed >> >> >Mike Feher wrote: >> >> A long time ago, when I was concerned about a phase noise issue, I found an >> old NBS article. It was on measuring phase noise and included a schematic of >> an ultra-low noise amplifier. In that amplifier they used Mercury batteries. >> I also glanced at the referenced article, stating NiCad is the lowest noise, >> and, NiCads were available for a long time, yet they used Mercury. Regards >> - Mike >> > >> >> >> >> _______________________________________________ >> 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.
