Re: [time-nuts] No State Of The Art Counter

Indeed. The ADCMP573 and ADCMP553 are already on my digikey order list. :) Complete with nice pecl output that I can connect to the LVPECL input of the spartan-6. Thanks for the tip though, always good to know I'm not the only one who thinks of using it. let's call it confirmation. Thanks! :)

Re: [time-nuts] Fwd: Request

Search eBay for GPS Tracker. Also sold by various Spy Stores on the Internet.Frequently used by amateur private investigators, law enforcement and governmentagents to track persons of interest. -- FL --- Den søn 9/1/11 skrev Joe Leikhim : Fra: Joe Leikhim Emne: [time-nuts] Fwd: Request Til: ti

Re: [time-nuts] Fwd: Request

I think Larry wants something small to fit in a rocket, to find GPS position and relay via GSM or 3G network (here in US). On 1/9/2011 6:11 PM, Rob Kimberley wrote: What do you need from the GPS? Time, position, both? Most smart phones have GPS built in these days. Can you give some more deta

Re: [time-nuts] No State Of The Art Counter

Take a look in Analog Devices ADCMP572/573. Very fast comparators, easy to add DC offset and hysteresis. >How will the input side work? How will you handle input signals of >various kinds? In particular sine of various amplitudes and frequencies. >Slew-rate can be a limiting factor as white noise

Re: [time-nuts] 10811 foam enclosure

Magnus Thank you for your response. Bert In a message dated 1/9/2011 8:43:30 P.M. Eastern Standard Time, mag...@rubidium.dyndns.org writes: On 10/01/11 00:59, Tom Van Baak wrote: >> Being a Shera Fan I finally broke down and bought a Tbolt. I >> experimented with a foam enclosure with r

[time-nuts] Re Tbolt tuning (was re 10811 foam enclosure)

Interesting thanks.  At the moment my Tbolt board (I just have a bare board without an enclosure) seems to work best with a 400 to 600 second TC and  damping in the range of .7 to 1.   I'm thinking mounting it in a heavy metal enclosure may improve things and allow the use of longer TC's.      I

Re: [time-nuts] 10811 foam enclosure

WarrenS wrote: > > a) Aging Rate spec <5e-10, easy to find ones that are 100 times better That is news to me, having looked at 100's of 10811's. > b) Temp TC for small changes, easy to find/Made them 100 times better with > outer oven I'm surprised, but haven't detailed knowledge. The outer ov

Re: [time-nuts] 10811 foam enclosure

At 06:36 PM 1/9/2011, Tom Van Baak wrote... The outer oven was a hack so Z3801A could meet telecom cell tower cold weather warm-up specs. In other words, the better performance they were looking for in that case was warm-up time; not a tempco or frequency stability spec. The Nortel GPSR (Z380

Re: [time-nuts] 10811 foam enclosure

On 10/01/11 00:59, Tom Van Baak wrote: Being a Shera Fan I finally broke down and bought a Tbolt. I experimented with a foam enclosure with roughly 1 centimeter on all sides. What I found that it only increased the board temperature by 19 C. It was still as sensitive to ambient. Thanks to Lady H

Re: [time-nuts] 10811 foam enclosure

Does anyone have actual measurements with and without the outer oven controlled by a PID? see plot: on posting To avoid misunderstand

Re: [time-nuts] 10811 foam enclosure

Being a Shera Fan I finally broke down and bought a Tbolt. I experimented with a foam enclosure with roughly 1 centimeter on all sides. What I found that it only increased the board temperature by 19 C. It was still as sensitive to ambient. Thanks to Lady Heater it even shows an increase of 4

Re: [time-nuts] 10811 foam enclosure

Q) None of the hp/Agilent bench test equipment that uses these oscillators uses insulation. Perhaps that's a clue. a) It is not much of a clue, considering that a patent & knowledgeable time-nuter can get 10 to 100 + better performance out of them. The spec page for the 10811A is here: http

Re: [time-nuts] Fwd: Request

What do you need from the GPS? Time, position, both? Most smart phones have GPS built in these days. Can you give some more details on your requirements? Rob Kimberley (in UK) -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Joe Leik

[time-nuts] Fwd: Request

Anyone have any suggestions? Thanks! Original Message Subject:Request Date: Sun, 9 Jan 2011 17:41:42 -0500 From: Larry Padavich To: rhyol...@nettally.com I need a small gps device I can ping via smart phone. Is this possible ? Larry -- Joe Leikhim Leikhim

Re: [time-nuts] 10811 foam enclosure

Try suspending the tbolt mounted on block from string in a small cooler chest (6-pack size will do nicely). It should come into balance with the interior walls. Strings can be adjusted for best gravity response. use very fine wire for connections. Don > A simple box is fine for many Tbolt applicat

Re: [time-nuts] 10811 foam enclosure

A simple box is fine for many Tbolt applications. Much depends on the TBolt Osc and what setting you have, especially the TC and damping. With the factory default setting you can pretty much put the thing in an outside unsheltered shed and have it work OK, But it will not be the best it can be

Re: [time-nuts] 10811 foam enclosure

I use Alu extrusion that is used on commercial windows, got it twenty years ago, but they may still use it. Bert In a message dated 1/9/2011 3:09:19 P.M. Eastern Standard Time, mspencer12...@yahoo.ca writes: My experiences placing my thunderbolt board in various insulated containers sho

Re: [time-nuts] 10811 foam enclosure

My experiences placing my thunderbolt board in various insulated containers show little or no improvement over simply putting a cardboard box over it to keep drafts away. As time allows I'm going to re run some of the tests using my 5370 and an external standard vs relying on the data from the

Re: [time-nuts] 10811 foam enclosure

When I was working with a group that was buillding astronomical cameras using CCD chips we wanted to keep the CCD chip at a very constant temperature that was much lower than ambient. This is actually a harder problem then building a crystal oven but still not out of amateur's range.We ued a P

Re: [time-nuts] 10811 foam enclosure

Thanks for all the info. Agree after my tests on the Tbolt, that is why I will place large mass around it, will keep it close to ambient and move slowly. What is the zero G axis? Presently oven current is 65 mA down from 95 at room temp so I have room to go but I will monitor over ambient cha

Re: [time-nuts] R&S XSRM Rubidium

On 09/01/11 18:44, cdel...@juno.com wrote: This link shows the light from a rubidium spectral lamp. Its appearance is quite similar to the rubidium lamps used in various rubidium standards. There can be a slight bluish cast also, especially at low temperatures as the lamp warms up. I'm not fam

Re: [time-nuts] 10811 foam enclosure

Q) Has anyone experimented with the amount of insulation on a 10811 oscillator? a) Look inside a double oven 10811 to see one example of what works. Q) None of the hp/Agilent bench test equipment that uses these oscillators uses insulation. Perhaps that's a clue. a) It is not much of a

Re: [time-nuts] 10811 foam enclosure

Graham, I have no problems with my 10811 I just want to experiment with ways to improve performance, right now I have several that are in the E-13 range between 1 and 100 sec and am getting greedy and looking for ways to improve one of them. Want to take it step by step and not degrade a dev

Re: [time-nuts] 10811 foam enclosure

On 09/01/11 17:05, Poul-Henning Kamp wrote: In message<3150c.48e44656.3a5b1...@aol.com>, ewkeh...@aol.com writes: Being a Shera Fan I finally broke down and bought a Tbolt. I experimented with a foam enclosure with roughly 1 centimeter on all sides. Try to think of your foam as a resistor, yo

[time-nuts] R&S XSRM Rubidium

This link shows the light from a rubidium spectral lamp. Its appearance is quite similar to the rubidium lamps used in various rubidium standards. There can be a slight bluish cast also, especially at low temperatures as the lamp warms up. I'm not familiar with the R&S but depending on the desi

Re: [time-nuts] R&S XSRM Rubidium

On 09/01/11 12:12, Magnus Danielson wrote: On 09/01/11 11:20, Bruce Griffiths wrote: Magnus Danielson wrote: On 09/01/11 05:17, paul swed wrote: Lamp is orange purple Thanks, this is what I recall but never bothered to check myself. Where is that box of gas-lamps to help identify alkali met

Re: [time-nuts] 10811 foam enclosure

Bert: Make sure you are working on the correct problem. I find that the normal (in accordance with published specifications) daily aging of the crystal exceeds the daily variation of frequency with temperature of a stock 10811 in a benign (office or home) environment. If you are seeing frequenc

Re: [time-nuts] Archiving Timing Data

Have you thought of using RRD (Round Robin Database). RRD is a CSV format which stores value vs time and is generally used for archiving network performance data which is generally kept for years. This format has the advantage of compactness and arbitrary x y scaling. MRTG (Multi-Router Traffi

Re: [time-nuts] Archiving Timing Data

Hi I'm sitting here running data on a bunch of TBolts and the like. Might that data be useful to others - maybe. Could it be useful 100 years from not - doubtful. I have the ability to create enormous amounts of likely useless trivia. To me the burring the useful nugget in the mountain of trivi

Re: [time-nuts] 10811 foam enclosure

Hi The answer to the "how far can you go" is (as always) "that depends". You can tweak a 10811 balance wise to get it's thermal gain up 10X over the factory settings. You may be able to go higher, but 10 is what's been published. That will give you an oscillator who's crystal is very insensiti

Re: [time-nuts] 10811 foam enclosure

Thanks Poul-Henning makes sense Bert In a message dated 1/9/2011 11:06:34 A.M. Eastern Standard Time, p...@phk.freebsd.dk writes: In message <3150c.48e44656.3a5b1...@aol.com>, ewkeh...@aol.com writes: >Being a Shera Fan I finally broke down and bought a Tbolt. I experimented >with a f

Re: [time-nuts] 10811 foam enclosure

In message <3150c.48e44656.3a5b1...@aol.com>, ewkeh...@aol.com writes: >Being a Shera Fan I finally broke down and bought a Tbolt. I experimented >with a foam enclosure with roughly 1 centimeter on all sides. Try to think of your foam as a resistor, your alu box as a capacitor and heat as a vo

[time-nuts] 10811 foam enclosure

Being a Shera Fan I finally broke down and bought a Tbolt. I experimented with a foam enclosure with roughly 1 centimeter on all sides. What I found that it only increased the board temperature by 19 C. It was still as sensitive to ambient. Thanks to Lady Heater it even shows an increase o

Re: [time-nuts] R&S XSRM Rubidium

On 09/01/11 11:20, Bruce Griffiths wrote: Magnus Danielson wrote: On 09/01/11 05:17, paul swed wrote: Lamp is orange purple Thanks, this is what I recall but never bothered to check myself. Where is that box of gas-lamps to help identify alkali metals? Cheers, Magnus Use your spectrometer

Re: [time-nuts] R&S XSRM Rubidium

Magnus Danielson wrote: On 09/01/11 05:17, paul swed wrote: Lamp is orange purple Thanks, this is what I recall but never bothered to check myself. Where is that box of gas-lamps to help identify alkali metals? Cheers, Magnus Use your spectrometer. Spectrum should be similar to that attach

Re: [time-nuts] R&S XSRM Rubidium

On 09/01/11 05:17, paul swed wrote: Lamp is orange purple Thanks, this is what I recall but never bothered to check myself. Where is that box of gas-lamps to help identify alkali metals? Cheers, Magnus ___ time-nuts mailing list -- time-nuts@febo.c

Re: [time-nuts] R&S XSRM Rubidium

On 09/01/11 03:56, Magnus Danielson wrote: Hi! My R&S XSRM Rubidium is having problems. It behaves as there is no light from the lamp, and I can't see any light from it, but I let it warm up again. The manual doesn't give clear indication on how one should observe light, but it seems like there

Re: [time-nuts] Interesting "ware of the month"...

I've not seen any timing receiver with that amount of hardware on one board. I'm guessing some sort of Telco processor or I/O board. Interesting site though, and as I like a bit of mental challenge, I'm book marking it! Rob Kimberley -Original Message- From: time-nuts-boun...@febo.com [