Re: [time-nuts] TAPR GPS Experimenters Kit

Greg, Funny. Some of the lucent boxes have been in strange places as well. Can you please check your PPS to see if you get a signal when in that other mode (where it needs at least one sat locked)? > On Jun 2, 2017, at 5:13 PM, Gregory Beat wrote: > > Received a note from

Re: [time-nuts] Exciting news for the western US eloran to be on the air!!

Excellent!! Do you know why the testing periods terminate, and whether Wildwood will return back on air? -Ruslan -- Ruslan Nabioullin Wittgenstein Laboratories rnabioul...@gmail.com (508) 523-8535 50 Louise Dr. Hollis, NH 03049 ___ time-nuts mailing

Re: [time-nuts] GPS history

Sure, Jeremy, just got back home. My information is from Schedules Direct. Saturday, Jun 03 2:00 PM EDST on C-Span 3 Global Positioning System History Find Id 736848 Program Id SH02702989 It shows that it runs until 3:39 PM EDST, but other C-Span programs I've recorded aired longer

Re: [time-nuts] TAPR GPS Experimenters Kit

Received a note from John Koster, W9DDD that TAPR had one complete GPS kit left. https://www.tapr.org/gps_exp-kit.html Received #CAB083 (2.1mm DC Barrel Jack to Bare Wire/"Pigtail") this morning via AirMail. https://www.moddiy.com/products/2.1mm-DC-Barrel-Jack-to-Bare-Wire-%28Open-End%29.html

Re: [time-nuts] HP5061B Versus HP5071 Cesium Line Frequencies

Hi > On Jun 2, 2017, at 7:45 PM, Donald E. Pauly wrote: > > https://www.febo.com/pipermail/time-nuts/2017-May/105566.html > Ok, so yet again a reference to the start of this thread … why? > >

Re: [time-nuts] HP5061B Versus HP5071 Cesium Line Frequencies

> On Jun 2, 2017, at 7:45 PM, Donald E. Pauly wrote: > > https://www.febo.com/pipermail/time-nuts/2017-May/105566.html > > Electronic thermal coolers did not exist then so it could not be done. > Electronic temperature sensors did not exist either. That crystal cut >

Re: [time-nuts] Fwd: HP5061B Versus HP5071 Cesium Line Frequencies

Thermomechanical fatigue can significantly reduce the lifetime of Peltier devices if the ripple current flowing in the Peltier device is too high. This can become an issue with switchmode drive to a Peltier cooler. Bruce > > On 03 June 2017 at 11:02 jimlux wrote: >

[time-nuts] Fwd: HP5061B Versus HP5071 Cesium Line Frequencies

https://www.febo.com/pipermail/time-nuts/2017-May/105566.html Electronic thermal coolers did not exist then so it could not be done. Electronic temperature sensors did not exist either. That crystal cut has been known since the 1940's at least. It has been neglected because of limited

Re: [time-nuts] Fwd: HP5061B Versus HP5071 Cesium Line Frequencies

With an AT crystal, manufacturing tolerances will likely ensure that the inflection point slope is non zero whereas the same manufacturing tolerances will merely change the turnover temperature. Its likely that a more manufacturable design will result if one operates at a turnover point (with

Re: [time-nuts] HP5061B Versus HP5071 Cesium Line Frequencies

> A guy by the name of David W. Allan used direct multiplication to > build NBS-4 and NBS-5, see http://tf.nist.gov/general/pdf/65.pdf . He > didn't see anything wrong with it. He used a commercial frequency > standard modified from 5 mc to 5.006880 mc. That kind of LO is ok for a research

Re: [time-nuts] GPS history

Alas, I don't get CSPAN-3. Maybe someone will put it on YouTube. J. On Fri, Jun 2, 2017 at 4:11 PM Craig Kirkpatrick wrote: > https://www.c-span.org/video/?427553-2/global-positioning-system-history < >

[time-nuts] HP5061B Versus HP5071 Cesium Line Frequencies

https://www.febo.com/pipermail/time-nuts/2017-May/105566.html Tell us more about the RF leakage problems in the 5061. I thought that the 5071 used the same beam tube. How does the electricity leak out and at what frequencies?My method costs a tenth as much and has higher spectral purity

Re: [time-nuts] GPS history

https://www.c-span.org/video/?427553-2/global-positioning-system-history > On Jun 2, 2017, at 2:22 PM, Jeremy Nichols wrote: > > Thank a for the tip! > > CSPAN or CSPN2? > > What's the name of the

Re: [time-nuts] Fwd: HP5061B Versus HP5071 Cesium Line Frequencies

On 6/2/17 2:51 PM, Donald E. Pauly wrote: This is an improvement of 476 to 1. You apparently have not thought thru what improvements are possible with thermal coolers/heaters. Among these is near instant warm up and greatly reduced power for thermal management. without getting into the

Re: [time-nuts] HP5061B Versus HP5071 Cesium Line Frequencies

Hi Have you checked out the papers from the 1950 and `1960’s where they actually tried what you propose with essentially the same parts you are looking at using? Bob > On Jun 2, 2017, at 5:51 PM, Donald E. Pauly wrote: > > # 2 is not true. A cut has either two

Re: [time-nuts] HP5061B Versus HP5071 Cesium Line Frequencies

Hi How many OCXO’s have you actually built? Bob > On Jun 2, 2017, at 5:51 PM, Donald E. Pauly wrote: > > # 2 is not true. A cut has either two turning points or zero. Where > both turning points exist there are two temperatures at which the > temperature coefficient

[time-nuts] Fwd: HP5061B Versus HP5071 Cesium Line Frequencies

# 2 is not true. A cut has either two turning points or zero. Where both turning points exist there are two temperatures at which the temperature coefficient of frequency is zero. Cut 0 on figure 6 at https://coloradocrystal.com/applications has no turnover point. It is neither fish nor fowl.

Re: [time-nuts] GPS history

Thank a for the tip! CSPAN or CSPN2? What's the name of the program? Time and time zone? My provider lists only generic titles for the various programs, makes it nearly impossible to find a specific item like your program on GPS. Jeremy On Fri, Jun 2, 2017 at 1:21 PM Mike Naruta AA8K

[time-nuts] Exciting news for the western US eloran to be on the air!!

Quite the opportunity. 3 sites on the air and synchronized so you could actually do real location tracking. What is amazing is the sites have to some level been restored to operation. I have heard as an example Dana Indiana was gutted. Have fun and enjoy and I will be listening from the East

[time-nuts] HP5061B Versus HP5071 Cesium Line Frequencies

That is not true. I say that thermal coolers have made ovens obsolete. A zero temperature coefficient at room temperature is easier to hit than a zero temperature at the upper turnover point when such a thing exists. See curve 0 in Figure 6 at https://coloradocrystal.com/applications/ .

[time-nuts] HP5061B Versus HP5071 Cesium Line Frequencies

A cut at that angle has no turn over temperature. The zero temperature coefficient point is 25°. Its temperature coefficient everywhere else is positive. On Friday, June 2, 2017, Bob kb8tq wrote: > Hi > > If you are going to use an oven, it’s better to run it at the turn >

[time-nuts] GPS history

I notice that tomorrow CSPAN will have Richard Easton and Eric Frazier discuss the history and evolution of the global positioning system. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] HP5061B Versus HP5071 Cesium Line Frequencies

Hi Any real crystal you buy will have a tolerance on the angle. In the case of a crystal cut for turn the temperature will be a bit different and you will match your oven to it. If you attempt a zero angle cut, you will never really hit it and there is no way to compensate for the problem.

Re: [time-nuts] HP5061B Versus HP5071 Cesium Line Frequencies

I said no *manufacturer* does it this way. NBS is not a manufacturer. In a one-off money-is-no-object non-portable standard, you can make direct multiplication work. It will not work well in a 5061, because of RF leakage issues specific to the 5061 that are well documented. Bolting on a

Re: [time-nuts] HP5061B Versus HP5071 Cesium Line Frequencies

Hi If you are going to use an oven, it’s better to run it at the turn temperature of the crystal. That would put you above 50C for an AT and a bit higher still for an SC. Bob > On Jun 2, 2017, at 2:09 PM, Donald E. Pauly wrote: > >

[time-nuts] Fwd: HP5061B Versus HP5071 Cesium Line Frequencies

https://www.febo.com/pipermail/time-nuts/2017-May/105566.html If we build this circuit it would be a bench model not designed to be inside a hot chassis. It would be able to lock ± 5° C of 25° C. My idea of an oven is to keep the crystal and oscillator at 25° C ±0.001 °C with 60 second warm

[time-nuts] HP5061B Versus HP5071 Cesium Line Frequencies

https://www.febo.com/pipermail/time-nuts/2017-May/105566.html A guy by the name of David W. Allan used direct multiplication to build NBS-4 and NBS-5, see http://tf.nist.gov/general/pdf/65.pdf . He didn't see anything wrong with it. He used a commercial frequency standard modified from 5 mc to

Re: [time-nuts] HP5061B Versus HP5071 Cesium Line Frequencies

Hi > On Jun 1, 2017, at 10:04 PM, Donald E. Pauly wrote: > > https://www.febo.com/pipermail/time-nuts/2017-May/105566.html > > The lock system on the HP5071 is complex and expensive. My plan to > improve the HP5061B is to to use a pair of third overtone crystals >

[time-nuts] The future of Telecom Frequency Standard surplus

I was once tasked with building some building sway monitoring systems. The People With the Bucks were rather tight lipped about why they wanted to monitor building sway, but I think this was closely related to the reason... and yes, tall buildings wobble like a weeble (but don't fall down)