Re: [time-nuts] re low noise regulators

Jeffrey Pawlan wrote: > I checked both datasheets, the 723 and the LT1762. It was specsmanship that > rated the 723 as having lower noise. Here's how: > > The internal comparison opamp in the 723 was OK for its day back in > Fairchild's > history but by today's standards, it is noisy and has poor

[time-nuts] re low noise regulators

I checked both datasheets, the 723 and the LT1762. It was specsmanship that rated the 723 as having lower noise. Here's how: The internal comparison opamp in the 723 was OK for its day back in Fairchild's history but by today's standards, it is noisy and has poor gain and BW. So in order to make

Re: [time-nuts] Super Regulator links

This getting out of hand, If you closely study the Andy weeke's circuit and the Walt Jung variation, you will discover that it is VIRTUALLY the same circuit that is used in the UA723 regulator ! I suspect that Fairchild produced the UA723 before these guys produced their work. It may be that Jun

Re: [time-nuts] ** SPAM ** Re: Re: Bruce's link

On Thursday 13 December 2007 09:40:39 pm Jeffrey Pawlan wrote: > The problem is definitely not in my Sun workstation which is fortunately > running unix so it is impervious to all the bad people out there. But I > have noticed that sites target the locale of the IP address that is trying > to acce

Re: [time-nuts] Super Regulator links

- Original Message - From: "Bruce Griffiths" <[EMAIL PROTECTED]> To: "Discussion of precise time and frequency measurement" Sent: Friday, December 14, 2007 4:36 PM Subject: Re: [time-nuts] Super Regulator links > John Miles wrote: >> What are some of your favorite low-noise regulators

Re: [time-nuts] Super Regulator links

> Can you explain to me the use of fast recovery diodes if you are going > to put capacitors across them? I can see using fast-recovery diodes if you want to rectify the output of a switching supply, to limit the losses. Ordinary 1N400x diodes start to run very hot above a few kHz. In a switche

Re: [time-nuts] Super Regulator links

John Miles wrote: > What are some of your favorite low-noise regulators? When I made the remark > about the uA723, I was specifically thinking of its performance compared to > the LT1762. With Cref=5 uF, the uA723's output noise voltage is rated at > 2.5 uV from 100 Hz to 10 kHz. The LT1762, whi

Re: [time-nuts] need recomendation for a portable 10mhz reference oscilator

- Original Message - From: "Bruce Griffiths" <[EMAIL PROTECTED]> To: "Discussion of precise time and frequency measurement" Sent: Thursday, December 13, 2007 6:08 PM Subject: Re: [time-nuts] need recomendation for a portable 10mhz reference oscilator > Magnus Danielson wrote: > > > Why

Re: [time-nuts] Super Regulator links

> -Original Message- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Matt Ettus > Sent: Thursday, December 13, 2007 8:25 PM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] Super Regulator links > > Can you explain to me the use o

Re: [time-nuts] Super Regulator links

What are some of your favorite low-noise regulators? When I made the remark about the uA723, I was specifically thinking of its performance compared to the LT1762. With Cref=5 uF, the uA723's output noise voltage is rated at 2.5 uV from 100 Hz to 10 kHz. The LT1762, which seems to be among Linea

Re: [time-nuts] Super Regulator links

Matt Matt Ettus wrote: > Can you explain to me the use of fast recovery diodes if you are going > to put capacitors across them? > > Even with the snubber networks the reverse conduction time of the fast recovery diodes is considerably shorter than when a standard recovery rectifier is used. Its

[time-nuts] ** SPAM ** Re: Re: Bruce's link

On Fri, 14 Dec 2007, Bruce Griffiths wrote: > Have just checked I dont see any P... site, the problem may be at your end. > However I do get an extraneous nonporn popup window > Will try to locate reliable links to the actual pdf files for these > circuits. > > Failing that I've actually downloa

Re: [time-nuts] Super Regulator links

On Dec 13, 2007 6:15 PM, Bruce Griffiths <[EMAIL PROTECTED]> wrote: > Matt Ettus wrote: > > He has "ultra high performance rectifier bridges". Sounds like snake oil > > to me. > > > > Matt > > > > > Try looking at the circuit before commenting. I did. > Different culture express themselves in

Re: [time-nuts] Super Regulator links

Matt Ettus wrote: > He has "ultra high performance rectifier bridges". Sounds like snake oil to > me. > > Matt > > Try looking at the circuit before commenting. Different culture express themselves in slightly different ways, its best to study the actual circuit and think about what the desig

Re: [time-nuts] Super Regulator links

He has "ultra high performance rectifier bridges". Sounds like snake oil to me. Matt On Dec 13, 2007 5:57 PM, Bruce Griffiths <[EMAIL PROTECTED]> wrote: > Revised Super regulator link is: > > http://www.sjostromaudio.com/_unsql/hifi/ > > However this may change as the website is in process of mo

[time-nuts] Super Regulator links

Revised Super regulator link is: http://www.sjostromaudio.com/_unsql/hifi/ However this may change as the website is in process of moving. It works at the moment. Bruce ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://ww

Re: [time-nuts] ** SPAM ** Re: Bruce's link

>> >> 2. Bruce and others, you should really check your links before >> posting them. On >> this page was a link to get the full PDF of the schematic. When >> you click on >> that, you get a 404 not found plus you get a popup ad. Worse >> still, if you >> click on the schematic to "enlarge" it, i

Re: [time-nuts] ** SPAM ** Re: Bruce's link

John Miles wrote: > Bruce can post all the porn links he wants. I'm already going to have to > install a new hard drive to archive all the useful schematics and design > notes he's been contributing! Might as well fill up the remaining space > with SOMETHING. > > In case the message isn't clear e

[time-nuts] Entry level system

I suggest that for anyone getting involved in frequency references for the first time, and prepared to learn by doing things themselves, would find it useful to have a go at building a simple GPS Disciplined Reference. Sure, they may not be the ultimate reference (especially if simple and homebrew

Re: [time-nuts] ** SPAM ** Re: Bruce's link

Bruce can post all the porn links he wants. I'm already going to have to install a new hard drive to archive all the useful schematics and design notes he's been contributing! Might as well fill up the remaining space with SOMETHING. In case the message isn't clear enough, I really appreciate th

Re: [time-nuts] is there a "best bet" advanced hobbyist buildable GPSDOdesign?

On Dec 13, 2007 6:24 PM, Bruce Griffiths <[EMAIL PROTECTED]> wrote: > They "stole" that circuit topology from the Super regulator circuits > developed by Walt Jung among others. ___ time-nuts mailing list -- time-nuts@feb

[time-nuts] ** SPAM ** Re: Bruce's link

On Fri, 14 Dec 2007, Bruce Griffiths wrote: > > One of the better sites with info on such regulators is: > > http://sjostromaudio.com/joomla/index.php?option=com_content&task=view&id=26&Itemid=27 > > 1. This

Re: [time-nuts] Using a Vectron OCXO 5mhz oscilator with ntpd

Bruce Griffiths wrote: > Todd wrote: >> >> Yeah I've looked into that. My problem is the server I want to do the >> really precise measurement of is located in a secure datacenter that >> they're not going to let me drill a hole in the roof just so I can get >> really really accurate time when

Re: [time-nuts] Entry Level Systems Revisited

Hi Michael, Well, entry level to me means the least expensive way to have a house standard. So I doubt the basic premises have changed much. Depending upon one's means, a high stability "fancy" counter may not be in the offering. Therefore, some "decent" (hopefully cheap) oscillator locked to th

Re: [time-nuts] is there a "best bet" advanced hobbyist buildable GPSDOdesign?

steve heidmann wrote: > For low noise Zetex has a nice roll your own option, AN51 > > Steve > > Steve They "stole" that circuit topology from the Super regulator circuits developed by Walt Jung among others. One of the better sites with info on such regula

[time-nuts] Entry Level Systems Revisited

I've been researching an entry-level system for my own learning and experimentation. Back in May of 2006 there was a thread that posed the question "What's a good entry-level time reference system?". At that time there were several options suggested (partial list): - A local freque

Re: [time-nuts] is there a "best bet" advanced hobbyist buildable GPSDOdesign?

For low noise Zetex has a nice roll your own option, AN51 Steve Bruce Griffiths <[EMAIL PROTECTED]> wrote: Scott Scott Burris wrote: > Continuing the design discussions, anyone have opinions about powering > the HP 10811 oscillator? > I'm thinking that you

Re: [time-nuts] need recomendation for a portable 10mhz reference oscilator

Magnus Danielson wrote: > > Why would it be very hard? For his purpose it should easy enought to measure > > the frequency shift which he would allow, and achieving the necessary shift > > in > > temperature to get the ball-park aspect should not be too hard to acheive > > in a > > home enviormen

Re: [time-nuts] need recomendation for a portable 10mhz reference oscilator

David Forbes wrote: > > Bruce, > > Perhaps then this trick should be used with an ovenized oscillator of lesser > quality, > since it sounds like the E1938A will work just fine if stuck in the snow. > > Not that I have one on hand to test, anyways. > > David Putting an OCXO in your pocket may

Re: [time-nuts] need recomendation for a portable 10mhz referenceoscilator

I must say that I find it interesting that we have not heard back from the original poster concerning this subject. You would think he would provide some response after all the comments that have been generated by this topic. Perhaps the subject matter became way too involved for what was needed

Re: [time-nuts] need recomendation for a portable 10mhz reference oscilator

> The E1938A oven has exceptionally high thermal gain so variations in the > OCXO frequency due to ambient temperature changes may well be insignificant. > Before proposing drastic/dangerous measures David should attempt to > measure the E1938A frequency variations as a function if temperature to

Re: [time-nuts] need recomendation for a portable 10mhz reference oscilator

From: Bruce Griffiths <[EMAIL PROTECTED]> Subject: Re: [time-nuts] need recomendation for a portable 10mhz reference oscilator Date: Fri, 14 Dec 2007 11:22:52 +1300 Message-ID: <[EMAIL PROTECTED]> > The E1938A oven has exceptionally high thermal gain so variations in the > OCXO frequency due to a

Re: [time-nuts] need recomendation for a portable 10mhz referenceoscilator

I have heard rumors of a U.S. Army program to develop a "suppository oscillator." I don't recall any details, though. -RL --- Robert Lutwak Symmetricom - Technology Realization Center [EMAIL PROTECTED](Business) [EMAIL PROTECTED] (Personal) (978) 23

Re: [time-nuts] need recomendation for a portable 10mhz reference oscilator

[EMAIL PROTECTED] wrote: > Hi David, > > that HP puck runs it's crystal at over 100 Degrees C, and the enclosure > temperature of a typical OCXO gets to above 60C in still air. > > They also have Tantalum caps, and anyone who has seen a fiery Tantalum cap > explosion knows these things can

Re: [time-nuts] need recomendation for a portable 10mhz reference oscilator

In a message dated 12/13/2007 09:58:04 Pacific Standard Time, [EMAIL PROTECTED] writes: >oscillator. You could slip it into a pocket you would sew in your >long johns in the armpit or groin area. That should keep it >toasty-warm at all times. Hi David, that HP puck runs it's crystal

Re: [time-nuts] is there a "best bet" advanced hobbyist buildable GPSDOdesign?

Scott Scott Burris wrote: > Continuing the design discussions, anyone have opinions about powering > the HP 10811 oscillator? > I'm thinking that you want voltage regulators that are pretty quiet so > as to minimize jitter introduced > via the power supply. To that end, I'm looking at a LT1761 f

Re: [time-nuts] Upgrading possibilities for more accurate, precise stable time system.

Ronald Held wrote: > Greetings: >I am very new to this list. I do not have the necessary circuit > skills, so i would have to buy preassembled components. I have a > EndrunTCXO discipline via CDMA signals, which go into a display > unit driven by a STAMP microprocessor(AFAIK, since Bob buil

Re: [time-nuts] Using a Vectron OCXO 5mhz oscilator with ntpd

Todd wrote: > Hal Murray wrote: > >>> I have started to see this 5mhz frequency quartz oscilators that are >>> really inexpensive (see http://www.alltronics.com/cgi-bin/ >>> category.cgi?item=04P010 ). My question, how would you get this to >>> work with ntpd? Seems like it work great for my s

[time-nuts] Upgrading possibilities for more accurate, precise stable time system.

Greetings: I am very new to this list. I do not have the necessary circuit skills, so i would have to buy preassembled components. I have a EndrunTCXO discipline via CDMA signals, which go into a display unit driven by a STAMP microprocessor(AFAIK, since Bob build and programmed it. Given

Re: [time-nuts] is there a "best bet" advanced hobbyist buildableGPSDOdesign?

phil wrote: >> On Dec 13, 2007 12:00 PM, Scott Burris <[EMAIL PROTECTED]> wrote: >> >>> Continuing the design discussions, anyone have opinions about powering >>> the HP 10811 oscillator? >>> I'm thinking that you want voltage regulators that are pretty quiet so >>> as to minimize jitter intro

Re: [time-nuts] is there a "best bet" advanced hobbyist buildable GPSDOdesign?

Bruce Griffiths wrote: > Data delay devices (http://www.datadelay.com) also do programmable delay > lines their minimum order is $US75 which isnt too bad particularly if > more than one sawtooth corrector is to be built. > They even do ECL programmable delays as do Micrel (http://www.micrel.com). >

Re: [time-nuts] is there a "best bet" advanced hobbyist buildableGPSDOdesign?

> On Dec 13, 2007 12:00 PM, Scott Burris <[EMAIL PROTECTED]> wrote: > > > > Continuing the design discussions, anyone have opinions about powering > > the HP 10811 oscillator? > > I'm thinking that you want voltage regulators that are pretty quiet so > > as to minimize jitter introduced > > via the

Re: [time-nuts] need recomendation for a portable 10mhz reference oscilator

At 11:38 AM -0800 12/11/07, Eric Fort wrote: >I'm looking for a fairly basic, relatively simple 10 Mhz PORTABLE >reference (probably quartz based) with enough stability over a period >of a week of outdoor temp extremes to keep a 47Ghz transmitter locked >within 100hz while mountaintop contesting.

Re: [time-nuts] is there a "best bet" advanced hobbyist buildable GPSDOdesign?

On Dec 13, 2007 12:00 PM, Scott Burris <[EMAIL PROTECTED]> wrote: > > Continuing the design discussions, anyone have opinions about powering > the HP 10811 oscillator? > I'm thinking that you want voltage regulators that are pretty quiet so > as to minimize jitter introduced > via the power supply.

Re: [time-nuts] is there a "best bet" advanced hobbyist buildable GPSDOdesign?

Bruce Griffiths wrote: > On checking the Mouser and Digikey websites the DS1020 series > programmable delay lines are non stock items. > However I can obtain the DS1020-25 locally from RS Components. > The D1020-15 would be preferable for use with an M12M GPS timing > receiver, however the DS1020-2

[time-nuts] SI Time

Years ago I did a lot of research into MEMS. Has anyone on here have any experience with the following? - http://tinyurl.com/3xnh6w Mike B. Feher, N4FS 89 Arnold Blvd. Howell, NJ, 07731 732-886-5960 ___ time-nuts mailing list -- time-nuts@fe

Re: [time-nuts] Using a Vectron OCXO 5mhz oscilator with ntpd

Hal Murray wrote: >> I have started to see this 5mhz frequency quartz oscilators that are >> really inexpensive (see http://www.alltronics.com/cgi-bin/ >> category.cgi?item=04P010 ). My question, how would you get this to >> work with ntpd? Seems like it work great for my situation where I can