Re: [time-nuts] ***SPAM*** Re: Why discipline Rubidium oscillator?

> Le 20 nov. 2017 à 20:53, Dana Whitlow a écrit : > > > > In my pre-retirement job I rode herd on an active Hydrogen maser system,and > even > that has a clear drift tendency. Generally a couple or three times per > year I had to make a frequency adjustment in the

Re: [time-nuts] X72 Heatsink

Mark, I don’t know if I want to do 150 of these like the last time I signed-up for a project like this, but if someone wants their heatsink drilled and milled, send them to me with instructions for the cost of shipping back. If you want to ship the entire case to me, I’ll drill and mill and tap

Re: [time-nuts] Why discipline Rubidium oscillator?

Thanks, Bob, I’ll have to start looking now. I’ve been looking for other counters, I only have 5371a x 2 and 5335a x 2 and some other TeK modules. I went back and was reading the time-nut counter thread from 2008 and will have to keep looking for something I want to afford. Tonight I was

Re: [time-nuts] Why discipline Rubidium oscillator?

Oops cat hit ‘send’ 5071’s I’ve seen for as low as about 9k, but usually in the 15-30 range. I don’t want to know what they are new. 5061’s can be had for under $1000. If you are very lucky, under $500. And once you have the standard, you need the counters. And other analysis tools...pretty

Re: [time-nuts] Why discipline Rubidium oscillator?

Cost of a cesium clock can go from less than you pay for a pair of doxco‘s to many tens of thousands. I think 5071’s are in > On Nov 20, 2017, at 23:50, Jerry Hancock wrote: > > I read up on the GPS L1/L2 and I think there is an L5. > > And when you say “on the market” the

[time-nuts] Why discipline Rubidium oscillator?

I did hack together some code to GPS discipline a HP-5071. But it only disciplines the oscillator if the unit is in standby and the cesium tube is off... I did say it was a hack... -- > You can (or course) do a GPS disciplined Cs standard. That’s not easy to do, > but some are

Re: [time-nuts] Why discipline Rubidium oscillator?

I read up on the GPS L1/L2 and I think there is an L5. And when you say “on the market” the real question is “can be purchased for 1/20th the price of new” like all the other re-purposed toys we buy, Regards, Jerry > On Nov 20, 2017, at 6:43 PM, Dana Whitlow wrote: >

Re: [time-nuts] Why discipline Rubidium oscillator?

As far as I knew, the highest level steps *actually on the market* are the Cesium beam clocks and the active hydrogen masers. Are any of the newer technologies available for purchase today? Dana On Mon, Nov 20, 2017 at 6:13 PM, Hal Murray wrote: > > aren’t too many

[time-nuts] X72 Heatsink

I stopped by a local electronics store today and came across a heatsink that is the perfect size for the X72. To mount the X72 to it you would need to drill four holes in the corners and do a little Dremel work on the outer fins to get to the screw heads. The store owner says he has a case

Re: [time-nuts] Why discipline Rubidium oscillator?

On Mon, Nov 20, 2017 at 7:14 PM, Jerry Hancock wrote: > Have to do a cost/benefit analysis for the wife... I hope she is not the type of person who sets her watch 5 minutes ahead so she will arrive on time! -- --Jim Harman ___

Re: [time-nuts] Why discipline Rubidium oscillator?

Hi Most GPSDO’s run the GPS signal only on one “band” (L1). If you want to eliminate the errors in the ionosphere correction process you go to.a double band (L1 and L2) GPS receiver. Since there are fewer potential errors in the GPS signal, you may have fewer net errors in your GPSDO. For the

[time-nuts] Why discipline Rubidium oscillator

For you, nerd dick waving. For her, bragging rights! She will have the most accurate egg timer on the block (assuming she is the head chef in the house). > Have to do a cost/benefit analysis for the wife... ___ time-nuts mailing

Re: [time-nuts] Why discipline Rubidium oscillator?

> aren’t too many steps after that Your imagination is broken. There are lots more steps. Most of them are very expensive. -- These are my opinions. I hate spam. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Why discipline Rubidium oscillator?

Not to junk up the mailboxes, but I have the multiple GPSDOs. Don’t know what you mean by L1/L2 GPSDO, is that a quality statement? Also, what would the next step cost me for a Cesium Beam? Roughly? And what order of magnitude improvement would that be for the cost? Have to do a

Re: [time-nuts] Why discipline Rubidium oscillator?

Hi Ummm ….. e ….. multiple GPSDO’s …. L1/L2 GPSDO(s) …. Cs standard (s) … Maser(s) …. Ensembles of all of the above …. There’s *lots* of steps still to take …. Bob > On Nov 20, 2017, at 6:31 PM, Jerry Hancock wrote: > > One step at a time. > > 2yrs ago when the

Re: [time-nuts] Why discipline Rubidium oscillator?

One step at a time. 2yrs ago when the time-bug hit, I had a crystal oscillator. 6 months later, DOCXO then GPSDO then Rubidium soon to be with GPSDO and there aren’t too many steps after that… I also gave my brother the bug the other day… > On Nov 20, 2017, at 3:05 PM, Bob kb8tq

Re: [time-nuts] Why discipline Rubidium oscillator?

Hi It’s very much a “somewhere near that number” sort of thing with an Rb. The “thing” you are looking at is quantum mechanical in nature. Unfortunately that by its self does not make it perfect. A beam tube (as opposed to a gas cell) isolates things better. A 5061 is a beam tube device. A

Re: [time-nuts] Why discipline Rubidium oscillator?

And even without problems like external magnetic fields, Rb oscillators do drift with age. Over a period of several years they may drift as much as ~1E-9, which is a *huge* error for serious time nuts. In my pre-retirement job I rode herd on an active Hydrogen maser system, and even that has a

Re: [time-nuts] HP5065A C-field mods and optical unit mods

In message <5AC3D7F0C1F14BAB8B7BE4A552034FCC@dell370>, ws at Yahoo via time-nuts writes: >C-fields are current sensitive, so if they are wound with copper wire, any >small change in their temperature, even when temperature controlled, could >have a effect much greater than 1PPM on that

Re: [time-nuts] Why discipline Rubidium oscillator?

On Mon, Nov 20, 2017 at 8:28 PM, Jerry Hancock wrote: > Bob, I was referring to the rubidium standard of 6834682610.904 Hz. For some > reason I thought it was closer to 9Ghz. > > I assume then rubidium standards oscillate (if that is the correct term) > somewhere around that

Re: [time-nuts] Why discipline Rubidium oscillator?

Bob, I was referring to the rubidium standard of 6834682610.904 Hz. For some reason I thought it was closer to 9Ghz. I assume then rubidium standards oscillate (if that is the correct term) somewhere around that number but not exact or is it in the detection where things fall down? > On

Re: [time-nuts] Why discipline Rubidium oscillator?

Hi There is no direct relation for an Rb to 10 MYz. Cs beam tubes are what have a direct relation. Even then, the qualifier is “under standard conditions”. They are sensitive to magnetic field. Rb’s also are sensitive to magnetic field. Both can be tuned by varying the field. In the case of

[time-nuts] Why discipline Rubidium oscillator?

I know this is going to sound dumb as I know many GPSDOs had rubidium oscillators in them. I can see why, in that during holdover, they would tend to be more stable vs others, but given that there is a direct mathematical relationship between the rubidium frequency and potentially the 10Mhz

[time-nuts] HP5065A C-field mods and optical unit mods

Warren, Most all Rubidium standards do not have active current drive. The HP 5065A is the exception. However the mod I installed is not active. The C-field coils are roughly temperature compensated as they are near the cell oven that is regulated. If you check out Poul-Hennings "hacking the

Re: [time-nuts] HP5065A C-field mods and optical unit mods

Corby Just a 1 cent thought that may not apply or be accurate. C-fields are current sensitive, so if they are wound with copper wire, any small change in their temperature, even when temperature controlled, could have a effect much greater than 1PPM on that current when driven from a fixed

[time-nuts] should be of interest

A non time nut friend did send me this link which should be of interest Bert Kehren _http://www.radionet-eu.org/rda/archive/NA4-EN-SU-012-021_W.%20Schl%C3%BCter %20Fundamental%20Station%20Wettzell.pdf_

Re: [time-nuts] FE-5680A not responding to serial commands

BR If you haven't already you may want to have a look at documentation available on the K04BB web site for the 5680A, may luck out and get the serial port working. http://www.ko4bb.com/getsimple/index.php?id=manuals=02_GPS_Timing/FEI/FE-5680A -=Bryan=-

[time-nuts] Symmetricom X72 rubidium oscillator breakout board now avaiable

Maybe: https://www.ebay.com/itm/Symmetricom-X72-Rubidium-Oscillator-10-32V-DC-10MHz-USED/132116702248?epid=1023910441=item1ec2c4e428:g:2p8AAOSwXYtYvKWc I don't know if RDR Electronics still have any X72's. There used to be a lot of X72's for sale that were pulled from something. They came

Re: [time-nuts] Recommendation for cheap GBIP adapter for Linux

On Sat, 18 Nov 2017 20:21:13 +, you wrote: >The Galvant adapter appears to use a very similar protocol to the Prologix, >but I'm unsure if it's exactly compatible. > >There have been large numbers of HP adapters on ebay - they're generally >thought to be clones of varying quality. >