Re: [time-nuts] TruePosition GPSDO Holdover Issues

> It's not hard to make your own plots. This is from 66 38' north. > http://users.megapathdsl.net/~hmurray/time-nuts/Arctic/Polar-A.png > If anybody wants to play, I'll put the code on the web. Code is on: http://users.megapathdsl.net/~hmurray/time-nuts/Arctic/code/ -- These are my

[time-nuts] Traveling to the US west coast

Hi, Some of you might already know, I will fly to the US west coast to attend IFCS. Afterwards, I will be in Seattle for a couple of days (from 25th to 31st). If you are in the area and want to meet up, please drop me an email (off-list). Attila Kinali -- It is upon

[time-nuts] Bodnar "Precision Frequency Reference (GPS Clock)" AND LeoNTP Networked Time NTP Server Questions

Anyone who is using one (or both) of these, and/or folks who have a logical opinion: *"GPSDO"* - Once configured, unit can run on an external DC source (5-15VDC).  I am NOT using it to power the mast mounted timing antenna.  I don't anticipate leaving unit connected to a computer when not

[time-nuts] WTB: HP/Agilent/Symmetricom 58517A Distribution Amplifier

Need one of these: *HP/Agilent/Symmetricom 58517A Distribution Amplifier (8 port)* Ideally... actually definitely need the one with the external DC power input with DC blocks on all 8 ports. I have a 4-port, but it's going to be full by the end of the week. 73, Clay, KY5G -- *Clay Autery

Re: [time-nuts] Bodnar "Precision Frequency Reference (GPS Clock)" AND LeoNTP Networked Time NTP Server Questions

Anyone who is using one (or both) of these, and/or folks who have a logical opinion: [] There's more... but this is a good start. Just want to try and get parts on the way. Have to build a separate outboard regulator for the timing GPS antenna, too. Thanks! Clay Autery

Re: [time-nuts] Bodnar "Precision Frequency Reference (GPS Clock)" AND LeoNTP Networked Time NTP Server Questions

Caution, folks, about USB cable radiation. While the intended signals flowing through the cable presumably contribute a bit to the overall picture, common-mode currents on the cable are the most likely cause of severe radiation problems. These currents arise not merely from intended USB signals,

Re: [time-nuts] Bodnar "Precision Frequency Reference (GPS Clock)" AND LeoNTP Networked Time NTP Server Questions

Hi, On 05/18/2018 02:16 PM, Dana Whitlow wrote: > Caution, folks, about USB cable radiation. While the intended signals > flowing through the > cable presumably contribute a bit to the overall picture, common-mode > currents on the cable > are the most likely cause of severe radiation problems.

[time-nuts] OT Low Jitter FPGA Programming

I'm looking for someone experienced for an ultra low jitter clock generation an re-clocking project that includes FPGA programming. Anyone interested? Please contact me off list. Adrian ___ time-nuts mailing list -- time-nuts@febo.com To

Re: [time-nuts] Traveling to the US west coast

If Attilla is going to be in the Bay area I would like to come up and maybe have dinner. I live in Fresno, 180 miles south of San Francisco. Dave W6TE -Original Message- From: time-nuts On Behalf Of Pete Stephenson Sent: Friday, May 18, 2018 8:29 PM To:

[time-nuts] Cesium Clock Avialable

Hi, I am willing to part with my HP 5061A cesium standard and manual. The unit was rebuilt and functioning some years ago and not used since then. There is usable cesium in the tube and the unit worked. I have not tested it recently. It has a Patek-Philippe analogue clock in the front. The unit

Re: [time-nuts] Traveling to the US west coast

Interestingly enough, I've moved from. Switzerland (where I've met Atilla) and am now in the Bay Area. It's be great to meet up again. Even if Attila doesn't make it to the SF area, I'd be interested in getting some local time nuts together. Cheers! -Pete On Fri, May 18, 2018, at 6:36 PM,

Re: [time-nuts] Improving ocxo temp control

In my experience, the oven temperature controller is rarely the determining factor for static oven performance. This article explains what the real determining factors are: http://www.karlquist.com/oven.pdf An analog oven temperature controller will be limited in its dynamics by how much

Re: [time-nuts] Cesium Clock Avialable

I dug not sure if the previous email went through correctly. I am interested in your cesium clock. My location is Portland Oregon 97217 On Fri, May 18, 2018, 9:31 PM Doug Millar via time-nuts wrote: > Hi, I am willing to part with my HP 5061A cesium standard and manual.

Re: [time-nuts] Traveling to the US west coast

Are you going to be in San Francisco area? Maybe we could get a time-nuts breakfast together with a couple of us. Regards, Jerry > On May 17, 2018, at 11:25 PM, Attila Kinali wrote: > > Hi, > > Some of you might already know, I will fly to the US west coast > to attend

Re: [time-nuts] Bodnar "Precision Frequency Reference (GPS Clock)" AND LeoNTP Networked Time NTP Server Questions

A shield will definitely help with differential mode noise (the USB communication signal) but has little effect on common mode noise (the digital stuff coming from other parts of the circuit), a choke is the fix for common mode (if you can't get rid of the noise at the source, or otherwise return

Re: [time-nuts] WTB: HP/Agilent/Symmetricom 58517A Distribution Amplifier

Hi >From what I have seen, it is a rare setup that requires all amplified >distribution. Yes, it is possible. Unless you are in that rare case, the MiniCircuits eight and sixteen port splitters do a great job for *way* less money. Bob > On May 17, 2018, at 10:33 PM, Clay Autery

Re: [time-nuts] Bodnar "Precision Frequency Reference (GPS Clock)" AND LeoNTP Networked Time NTP Server Questions

On 5/18/18 6:09 AM, Clint Jay wrote: Interested to know how much noise would be from USB signalling and how much is " machine noise" from the PC as my understanding of USB signalling is that it's differential so such should be low noise? Every device I've worked with that had a USB interface

Re: [time-nuts] Bodnar "Precision Frequency Reference (GPS Clock)" AND LeoNTP Networked Time NTP Server Questions

Interested to know how much noise would be from USB signalling and how much is " machine noise" from the PC as my understanding of USB signalling is that it's differential so such should be low noise? I'm also not sure I've ever seen a non screened usb cable? On Fri, 18 May 2018 1:17 pm Dana

Re: [time-nuts] Question about frequency counter testing

Hi! -- From: "Magnus Danielson" From the 2.5 ns single shot resolution, I deduce a 400 MHz count clock. Yes. It is approx. 400MHz. OK, good to have that verified. Free-running or locked to a 10 MHz reference?

[time-nuts] WTB: HP/Agilent/Symmetricom 58517A Distribution Amplifier

Well, not strictly L1. I have a 58517A connected to an Ashtech Z12. It does report good signal levels on the L2 data (same range as the L1 signals)... but the Z12 L2 results are rather noisy and I don't get a very accurate solution. Also the '517A does seem to work OK with Galileo and

Re: [time-nuts] Traveling to the US west coast

I'm also interested if it can be arranged. It would be great to be able to meet Attila in person. Rick On 5/18/2018 9:36 AM, Jerry Hancock wrote: Are you going to be in San Francisco area? Maybe we could get a time-nuts breakfast together with a couple of us. Regards, Jerry On May 17,

Re: [time-nuts] Bodnar "Precision Frequency Reference (GPS Clock)" AND LeoNTP Networked Time NTP Server Questions

Have you considered asking Leo? In my experience, he is very helpful. Denny > On May 17, 2018, at 19:19, Clay Autery wrote: > > Anyone who is using one (or both) of these, and/or folks who have a logical > opinion: > > *"GPSDO"* - Once configured, unit can run on an

Re: [time-nuts] Bodnar "Precision Frequency Reference (GPS Clock)" AND LeoNTP Networked Time NTP Server Questions

On Thu, May 17, 2018 at 7:19 PM, Clay Autery wrote: > Anyone who is using one (or both) of these, and/or folks who have a > logical opinion: > - Not sure how much I plan to have the unit connected via USB. Beyond > curiosity data gathering for a while, I'm thinking at some

Re: [time-nuts] WTB: HP/Agilent/Symmetricom 58517A Distribution Amplifier

Hi What you really want is an LNA plus some filtering. MiniCircuits will sell you all sorts of “adequate” amplifiers. They show up surplus for reasonable prices. The key point is that ultra low noise figure it not needed. A 3db NF is just as good as 0.3 db in this case. The antenna sets the

Re: [time-nuts] WTB: HP/Agilent/Symmetricom 58517A Distribution Amplifier

Gotcha  and agree The 58516a/58517a as the main distro amp allows me to power the antenna with a separate supply (for many reasons). Essentially, I want to replace the 4-way with an 8-way amp with same power setup. Then if I want to cascade unpowered splitters from one or more unity

Re: [time-nuts] WTB: HP/Agilent/Symmetricom 58517A Distribution Amplifier

Ole! On Fri, 18 May 2018 20:31:22 +0200 Ole Petter Rønningen wrote: > Just a heads up, in case you’re not concious of the fact; at least my > HP splitter (can’t recall model# off hand) is strictly L1 - many > others are wide band and will allow L2 and whatever else you

Re: [time-nuts] WTB: HP/Agilent/Symmetricom 58517A Distribution Amplifier

Hi Well, a 4 port with 16 way splitters on each port is a *lot* of GPS devices……. Doing the same with an 8 port is a lot of lot of devices :) For a “over a hundred port” sort of solution, I think I would go with one of the custom GPS amplifiers and then run passive splitters after that. It’s

Re: [time-nuts] WTB: HP/Agilent/Symmetricom 58517A Distribution Amplifier

Just a heads up, in case you’re not concious of the fact; at least my HP splitter (can’t recall model# off hand) is strictly L1 - many others are wide band and will allow L2 and whatever else you might later want. Ole > 18. mai 2018 kl. 16:35 skrev Clay Autery : > >

Re: [time-nuts] Fwd: HP 53131A Power Off Mod

The PCBs and Parts arrived and, after putting everything together and testing it, it all seems to work fine. And, to document everything, I've put up a web page at my web site that describes the mod and how to implement it: https://sites.google.com/site/wayneholder/hp-53131a-power-off-mod I

[time-nuts] Improving ocxo temp control

Hi, I am trying to improve performance of an OCXO. Could you point me at a good design of a high resolution oven temperature controler please ? Preferably analog. Thx much, Gilles. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Bodnar "Precision Frequency Reference (GPS Clock)" AND LeoNTP Networked Time NTP Server Questions

Leo and I are already discussing it off list and he is trying to duplicate my measurements. Regards, Mark On Fri, May 18, 2018, 10:08 AM Denny Page wrote: > Have you considered asking Leo? In my experience, he is very helpful. > > Denny > > > > On May 17, 2018, at 19:19,

Re: [time-nuts] Improving ocxo temp control

Hi There are a number of papers out and about about the limits on OCXO performance. The bottom line is that coming up with a high resolution control circuit is the easy part of the task. Simple answer to the question: Set up a thermistor bridge and feed the difference into an op amp. Crank up

Re: [time-nuts] Improving ocxo temp control

My experience with industrial temperature control says there is always a time lag between applying power to the heater and raising the temperature at the thermistor. Because there is a lag, there is a gain beyond which the system oscillates. But I haven't read the non-referenced papers, so I