Re: [time-nuts] Traveling to the US west coast
Hi, I hope you guys all get together to meet with Attila. Unfortunately I will not be able to join this time, as I'd love to be at IFCS too, the budget for it did not materialize this time. I too need to get to SF bay area and Seattle area to meet the many friends there, but this was not the time. I did have the time to meet Attila att EFTF in Torino, I keep meeting him in more places in the world, including Neuchatel, Zurich, Besancon, Berlin/Potsdam, Paris, Torino... I really enjoy each time. So make sure to find him out now that he gets in your kneck of the woods. So, until I get to travel, I keep working on my backlog of articles. Already sent one of and another one is shaping up (finally). Cheers, Magnus On 05/19/2018 05:32 AM, David Smith wrote: > 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@febo.com > Subject: 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, 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, 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 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 moral qualities that a society is ultimately founded. All >>> the prosperity and technological sophistication in the world is of >>> no use without that foundation. >>> -- Miss Matheson, The Diamond Age, Neil Stephenson >>> ___ >>> time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to >>> https://eur04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fww >>> w.febo.com%2Fcgi-bin%2Fmailman%2Flistinfo%2Ftime-nuts&data=02%7C01%7 >>> C%7C1947df2ea29d48f7aa3208d5bd38b10a%7C84df9e7fe9f640afb435a >>> aaa%7C1%7C0%7C636622973542611628&sdata=Fx2SdOpMmpuGCtrh0krWB1NbzdjIy >>> AmbvPimzxeevqo%3D&reserved=0 >>> and follow the instructions there. >> >> ___ >> time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to >> https://eur04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww. >> febo.com%2Fcgi-bin%2Fmailman%2Flistinfo%2Ftime-nuts&data=02%7C01%7C%7C >> 1947df2ea29d48f7aa3208d5bd38b10a%7C84df9e7fe9f640afb435%7C >> 1%7C0%7C636622973542611628&sdata=Fx2SdOpMmpuGCtrh0krWB1NbzdjIyAmbvPimz >> xeevqo%3D&reserved=0 >> and follow the instructions there. > > > -- > Pete Stephenson > ___ > time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to > https://eur04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.febo.com%2Fcgi-bin%2Fmailman%2Flistinfo%2Ftime-nuts&data=02%7C01%7C%7C1947df2ea29d48f7aa3208d5bd38b10a%7C84df9e7fe9f640afb435%7C1%7C0%7C636622973542611628&sdata=Fx2SdOpMmpuGCtrh0krWB1NbzdjIyAmbvPimzxeevqo%3D&reserved=0 > and follow the instructions there. > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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. 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 > is in great physical condition. Asking $600 plus shipping from Long Beach, > CA. 90806 > I also have an ESI 242D resistance calibrator and a Julie primary > resistance standard in an oven. Let me know if you are interested. Very > reasonable. > Thanks, Doug K6JEY > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[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 is in great physical condition. Asking $600 plus shipping from Long Beach, CA. 90806 I also have an ESI 242D resistance calibrator and a Julie primary resistance standard in an oven. Let me know if you are interested. Very reasonable. Thanks, Doug K6JEY ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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 capacitance you are able to design with. Digital controllers get around this as well as having the capability of double integration for much better transient response. Rick On 5/18/2018 11:03 AM, Gilles Clement wrote: 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 https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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@febo.com Subject: 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, 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, 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 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 moral qualities that a society is ultimately founded. All > > the prosperity and technological sophistication in the world is of > > no use without that foundation. > > -- Miss Matheson, The Diamond Age, Neil Stephenson > > ___ > > time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to > > https://eur04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fww > > w.febo.com%2Fcgi-bin%2Fmailman%2Flistinfo%2Ftime-nuts&data=02%7C01%7 > > C%7C1947df2ea29d48f7aa3208d5bd38b10a%7C84df9e7fe9f640afb435a > > aaa%7C1%7C0%7C636622973542611628&sdata=Fx2SdOpMmpuGCtrh0krWB1NbzdjIy > > AmbvPimzxeevqo%3D&reserved=0 > > and follow the instructions there. > > ___ > time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to > https://eur04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww. > febo.com%2Fcgi-bin%2Fmailman%2Flistinfo%2Ftime-nuts&data=02%7C01%7C%7C > 1947df2ea29d48f7aa3208d5bd38b10a%7C84df9e7fe9f640afb435%7C > 1%7C0%7C636622973542611628&sdata=Fx2SdOpMmpuGCtrh0krWB1NbzdjIyAmbvPimz > xeevqo%3D&reserved=0 > and follow the instructions there. -- Pete Stephenson ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://eur04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.febo.com%2Fcgi-bin%2Fmailman%2Flistinfo%2Ftime-nuts&data=02%7C01%7C%7C1947df2ea29d48f7aa3208d5bd38b10a%7C84df9e7fe9f640afb435%7C1%7C0%7C636622973542611628&sdata=Fx2SdOpMmpuGCtrh0krWB1NbzdjIyAmbvPimzxeevqo%3D&reserved=0 and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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, 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, 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 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 moral qualities that a society is ultimately founded. All > > the prosperity and technological sophistication in the world is of no > > use without that foundation. > > -- Miss Matheson, The Diamond Age, Neil Stephenson > > ___ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. -- Pete Stephenson ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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 could be wrong. Bill Hawkins -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob kb8tq Sent: Friday, May 18, 2018 9:46 PM 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 the gain on the op amp to whatever you feel comfortable running. Some simple numbers: Thermistor changes 3% / C Single thermistor bridge changes 1.5% / C Output of the circuit will change the oven by 150C from power off to full on Neglecting the scale factors for simplicity Put in a gain of 100 on the op amp So, the bridge moves 1% and the controller goes from full off to full on. Crank in more gain "as required". The op amp isn't bothered until you get into the millions. With the simplified numbers above, the circuit has a thermal gain of 150. Getting much past 300 with a single oven is unusual. Bob > On May 18, 2018, at 2:03 PM, Gilles Clement wrote: > > 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 https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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 the gain on the op amp to whatever you feel comfortable running. Some simple numbers: Thermistor changes 3% / C Single thermistor bridge changes 1.5% / C Output of the circuit will change the oven by 150C from power off to full on Neglecting the scale factors for simplicity Put in a gain of 100 on the op amp So, the bridge moves 1% and the controller goes from full off to full on. Crank in more gain “as required”. The op amp isn’t bothered until you get into the millions. With the simplified numbers above, the circuit has a thermal gain of 150. Getting much past 300 with a single oven is unusual. Bob > On May 18, 2018, at 2:03 PM, Gilles Clement wrote: > > 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 https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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, 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 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 configuring > UNLESS I can figure out how to grab data from the unit via the USB port for > reporting/analysis. > > > > Questions: > > 1) What are the specs of the DC plug on the back? If I use an external > supply, I want to eliminate the addition of yet another SMPS/wall wart to > the clutter. > > > > 2) IF you were choosing a voltage to run JUST this unit on > big/short/twisted/ferited leads, what voltage would you choose (regulating > down from 13.8VDC or so). Anything above the required minimum will be > converted to heat in either the unit or at the regulator. Considering this > uses a TXCO (I think) and not an OXCO or DOXCO, is running it hotter to try > and achieve a more consistent internal temp worth the tradeoff in > potentially shortened life of the unit. (Bottom Line: What voltage will > make it run most accurately/consistently?) > > > > *LeoNTP Networked Time NTP Server* - Can be powered via USB or PoE > according to website. Detailed specs are seriously lacking. Trying to > wade through how to power it. USB is obviously 5vdc or a bit less But > the PoE could be much higher with an internal regulator(s) > > > > - I haven't bought my new switch yet, so I can buy one with PoE > capability or otherwise inject PoE on the Ethernet cable from the NTP > Server to the Gbit switch. > > - All Ethernet cables in my network are CAT-7 STP (shielded twisted > pair) or better. (Yeah, yeah, I know, wired Ethernet can be noisy, but you > do the best you can. IF wired Ethernet becomes an issue, I can back up to > the wireless network.) > > - 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 point I want it > to be disco'd and forgotten. One less potential USB cable radiating or > needing ferrites. > > > > 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 > > (318) 518-1389 > > MONTAC Enterprises* > > ___ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[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 https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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 had two spare board sets left. One is claimed, but if someone would like the other set, send me your address and I'll send them your way. Wayne On Mon, May 7, 2018 at 10:27 PM, Tim Tuck wrote: > Hi Wayne, > > Congrats on a nice simple mod ! > > I have both a 53131 and 181 in need of these :) > > Can you share the gerbers for your PCBs and then I can cut them out on my > mill. > > I could probably make a few for any interested Australians, to save on > cross pond postage. > > thanks > > Tim > > On 8/05/2018 9:08 AM, Wayne Holder wrote: > >> I recently purchased a surplus HP 53131A and was surprised to see that >> it's >> designed to stay partially powered on, with the fan running, even when the >> power switch is in standby. The manual says this is for timebase >> temperature stability but, since I plan to use with my Trimble Thunderbolt >> as the reference source, I don't really need this feature. So, I decided >> to see if I could change this. >> > > > --- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus > > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/m > ailman/listinfo/time-nuts > and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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? Locked to OCXO (10MHz). OK. I saw some odd frequencies, and I agree with Bob that if you can, using two of those with non-trivial relationship can be used to get really good performance. I can use two or more, but unfortunately not simultaneously. So I will switch frequency if the problem is detected. Switching will interact with GPS data processing, but that probably can be fixed in software (I had no time to investigate the possible solutions and find the best one yet). BTW, the single shoot resolution can be doubled (to 1.25ns) with almost no additional HW (just a delay line for a bit more than 1.25ns and some resistors). Not sure if it worth to do (it also will halve the timestamping speed and double the timestamps memory requirements, so, in averaging modes it will be only sqrt(2) improvement). All the best! Oleg ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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, 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 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 moral qualities that a society is ultimately founded. All the prosperity and technological sophistication in the world is of no use without that foundation. -- Miss Matheson, The Diamond Age, Neil Stephenson ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[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 Glonass... maybe not optimum, but still quite OK. > 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. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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 noise for the system. ( unless you *really* run out of gain). Bob > On May 18, 2018, at 2:48 PM, Gary E. Miller wrote: > > 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 might >> later want. > > I have had good luck with cheap chinese wide-band splitters. No problems > with L1, L2, GLONASS and more. > > Like this one for $23: > > https://www.ebay.com/itm/RF-coaxial-Power-Splitter-Divider-Combiner-SMA-2-way-800-2500MHz-signal-booster/282970977753 > > Also, mostly good luck with cheap Chinese DC injectors. Some have had > bad solder joints, easily fixed. > > These have been good, for $9: > > https://www.aliexpress.com/item/RF-Isolator-Bias-Feeder-Bias-Tee-10MHz-3GHz/32848444588.html > > What I have not had luck with yet is finding a cheap LNA so I can recover > the gain lost in the splitters. The ones I have tested so far have all > seriously degraded my SNRs. > > Anyone know of a cheap and good L1/L2/etc. LNA? > > RGDS > GARY > --- > Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703 > g...@rellim.com Tel:+1 541 382 8588 > > Veritas liberabit vos. -- Quid est veritas? >"If you can’t measure it, you can’t improve it." - Lord Kelvin > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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 might > later want. I have had good luck with cheap chinese wide-band splitters. No problems with L1, L2, GLONASS and more. Like this one for $23: https://www.ebay.com/itm/RF-coaxial-Power-Splitter-Divider-Combiner-SMA-2-way-800-2500MHz-signal-booster/282970977753 Also, mostly good luck with cheap Chinese DC injectors. Some have had bad solder joints, easily fixed. These have been good, for $9: https://www.aliexpress.com/item/RF-Isolator-Bias-Feeder-Bias-Tee-10MHz-3GHz/32848444588.html What I have not had luck with yet is finding a cheap LNA so I can recover the gain lost in the splitters. The ones I have tested so far have all seriously degraded my SNRs. Anyone know of a cheap and good L1/L2/etc. LNA? RGDS GARY --- Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703 g...@rellim.com Tel:+1 541 382 8588 Veritas liberabit vos. -- Quid est veritas? "If you can’t measure it, you can’t improve it." - Lord Kelvin ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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 : > > 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 gain > ports on the distro amp, I can do that. > > For much of what I am/will be doing, I want to be able to provide "equal > access" to antenna signal to designated devices to control variables somewhat. > > *Clay Autery > (318) 518-1389 > * >> On 05/18/18 08:50, Bob kb8tq wrote: >> 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 > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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 going to be very bulletproof and less money than the prices you typically see on the 8 way HP devices. Given the way the HP amps do their thing, a passive splitter after a single amp is going to be a lot closer to “equal access” than the HP device. Bob > On May 18, 2018, at 10:35 AM, Clay Autery wrote: > > 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 gain > ports on the distro amp, I can do that. > > For much of what I am/will be doing, I want to be able to provide "equal > access" to antenna signal to designated devices to control variables somewhat. > > *Clay Autery > (318) 518-1389 > * > On 05/18/18 08:50, Bob kb8tq wrote: >> 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 > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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 gain ports on the distro amp, I can do that. For much of what I am/will be doing, I want to be able to provide "equal access" to antenna signal to designated devices to control variables somewhat. *Clay Autery (318) 518-1389 * On 05/18/18 08:50, Bob kb8tq wrote: 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 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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 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 configuring UNLESS I > can figure out how to grab data from the unit via the USB port for > reporting/analysis. > > Questions: > 1) What are the specs of the DC plug on the back? If I use an external > supply, I want to eliminate the addition of yet another SMPS/wall wart to the > clutter. > > 2) IF you were choosing a voltage to run JUST this unit on > big/short/twisted/ferited leads, what voltage would you choose (regulating > down from 13.8VDC or so). Anything above the required minimum will be > converted to heat in either the unit or at the regulator. Considering this > uses a TXCO (I think) and not an OXCO or DOXCO, is running it hotter to try > and achieve a more consistent internal temp worth the tradeoff in potentially > shortened life of the unit. (Bottom Line: What voltage will make it run most > accurately/consistently?) > > *LeoNTP Networked Time NTP Server* - Can be powered via USB or PoE according > to website. Detailed specs are seriously lacking. Trying to wade through > how to power it. USB is obviously 5vdc or a bit less But the PoE could > be much higher with an internal regulator(s) > > - I haven't bought my new switch yet, so I can buy one with PoE capability > or otherwise inject PoE on the Ethernet cable from the NTP Server to the Gbit > switch. > - All Ethernet cables in my network are CAT-7 STP (shielded twisted pair) or > better. (Yeah, yeah, I know, wired Ethernet can be noisy, but you do the > best you can. IF wired Ethernet becomes an issue, I can back up to the > wireless network.) > - 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 point I want it to > be disco'd and forgotten. One less potential USB cable radiating or needing > ferrites. > > 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 > (318) 518-1389 > MONTAC Enterprises* > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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 point I want it > to be disco'd and forgotten. One less potential USB cable radiating or > needing ferrites. > I have the Bodnar Mini which only has a USB connection. You can connect it to a USB power only source. I have found a large variation (20 dB) in close in phase noise, depending on how clean the power source is. I am using a power only wall wart with an added series ferrite core / shunt cap to get acceptable results ( -103 dBc/Hz at 10 Hz offset). I don't know if there is more internal filtering on the separate power input of the 2 output version. So far peak ADEV at Tau = 20s is about 2e-10. It would be nice to improve that. You can also get widely varying spurs, phase noise and ADEV depending on the register values chosen to provide a specific output frequency. Many different sets of register values may be used to provide the same output frequency. I have not determined a pattern. I just calculated different values and tried them out. Regards, Mark W7MLG ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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 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 moral qualities that a society is ultimately founded. All > the prosperity and technological sophistication in the world is of no > use without that foundation. > -- Miss Matheson, The Diamond Age, Neil Stephenson > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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 has radiated significant power around 12 or 24 MHz. (I've not worked much with devices that support 480Mbps USB3..) Indeed, the data wires are twisted pair (although the "twist rate" in most cables is pretty sketchy), but the signaling is voltage mode, not switched balanced current like LVDS. So I think you get significant current spikes on the power wires as you charge and discharge the capacitance/inductance of the (unterminated) data lines. The shielding is, in a lot of consumer devices, common to the power supply negative lead. So the shield carries part of the power supply current, and then radiates. In theory, USB devices sold in the United States should meet FCC Part 15 (and the similar requirements in the EU and elsewhere) - but I'll bet there's a LOT of stuff out there that isn't tested, nor would it pass. High Speed USB might be better for EMI/EMC - you're just not going to push 480Mbps through an unterminated system with crummy noise properties. TI has an application note https://www.ti.com/sc/docs/apps/msp/intrface/usb/emitest.pdf ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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 wrote: > > 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 > (318) 518-1389 > MONTAC Enterprises* > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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 common mode noise directly back to earth instead of through the cable). Didier KO4BB On Fri, May 18, 2018, 8:10 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? > > I'm also not sure I've ever seen a non screened usb cable? > > On Fri, 18 May 2018 1:17 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. These currents > > arise not merely from > > intended USB signals, but from *all* the digital activity within the > > device, and will be present > > whether or not USB communications are going on. > > > > The keys to controlling this problem are: > > > > 1) Shielding on the USB cable. > > 2) Proper design inside the USB device, rarely done beyond the point of > > (barely) meeting > > government regulations, which are far too forgiving IMHO. > > 3) Use of a ferrite choke on the cable to reduce those residual currents > > that get by anyway. > > > > Note that only item 3 might be under the control of the user to any > useful > > extent. > > > > So please don't just assume that using a USB cable for charging only > solves > > anything. > > > > Note that the above comments are also generally applicable to *all > *cables, > > including power > > cables, that are plugged into *any* digital device. > > > > DanaK8YUM > > > > > > > > On Fri, May 18, 2018 at 5:15 AM, David J Taylor via time-nuts < > > time-nuts@febo.com> wrote: > > > > > 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 > > > = > > > > > > Clay, > > > > > > I have all three of these units, all powered off USB. I don't see any > > > reason why you shouldn't use a USB cable with just the DC part > connected, > > > so that there's no issue about radiation. A standard USB port would > only > > > supply 0.5A so that's an upper limit on the power consumption. If > it's a > > > very long USB cable (you mention mast-head) check the resistance. > > > > > > As a crude guide... > > > > > > - The (larger box) NTP server feels cold to the touch. > > > > > > - The smaller, single output frequency source feels very slightly warm > to > > > the touch (feeding an Icom IC-R8600) > > > > > > - The larger, dual-output frequency source feels slightly warm to the > > > touch. > > > > > > There's an e-mail address where you could ask: supp...@leobodnar.com > > > > > > Cheers, > > > David > > > -- > > > SatSignal Software - Quality software written to your requirements > > > Web: http://www.satsignal.eu > > > Email: david-tay...@blueyonder.co.uk > > > Twitter: @gm8arv > > > ___ > > > time-nuts mailing list -- time-nuts@febo.com > > > To unsubscribe, go to https://www.febo.com/cgi-bin/m > > > ailman/listinfo/time-nuts > > > and follow the instructions there. > > > > > ___ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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 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. These currents > arise not merely from > intended USB signals, but from *all* the digital activity within the > device, and will be present > whether or not USB communications are going on. > > The keys to controlling this problem are: > > 1) Shielding on the USB cable. > 2) Proper design inside the USB device, rarely done beyond the point of > (barely) meeting > government regulations, which are far too forgiving IMHO. > 3) Use of a ferrite choke on the cable to reduce those residual currents > that get by anyway. > > Note that only item 3 might be under the control of the user to any useful > extent. > > So please don't just assume that using a USB cable for charging only solves > anything. > > Note that the above comments are also generally applicable to *all *cables, > including power > cables, that are plugged into *any* digital device. > > DanaK8YUM > > > > On Fri, May 18, 2018 at 5:15 AM, David J Taylor via time-nuts < > time-nuts@febo.com> wrote: > > > 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 > > = > > > > Clay, > > > > I have all three of these units, all powered off USB. I don't see any > > reason why you shouldn't use a USB cable with just the DC part connected, > > so that there's no issue about radiation. A standard USB port would only > > supply 0.5A so that's an upper limit on the power consumption. If it's a > > very long USB cable (you mention mast-head) check the resistance. > > > > As a crude guide... > > > > - The (larger box) NTP server feels cold to the touch. > > > > - The smaller, single output frequency source feels very slightly warm to > > the touch (feeding an Icom IC-R8600) > > > > - The larger, dual-output frequency source feels slightly warm to the > > touch. > > > > There's an e-mail address where you could ask: supp...@leobodnar.com > > > > Cheers, > > David > > -- > > SatSignal Software - Quality software written to your requirements > > Web: http://www.satsignal.eu > > Email: david-tay...@blueyonder.co.uk > > Twitter: @gm8arv > > ___ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to https://www.febo.com/cgi-bin/m > > ailman/listinfo/time-nuts > > and follow the instructions there. > > > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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. These currents > arise not merely from > intended USB signals, but from *all* the digital activity within the > device, and will be present > whether or not USB communications are going on. > > The keys to controlling this problem are: > > 1) Shielding on the USB cable. > 2) Proper design inside the USB device, rarely done beyond the point of > (barely) meeting > government regulations, which are far too forgiving IMHO. > 3) Use of a ferrite choke on the cable to reduce those residual currents > that get by anyway. > > Note that only item 3 might be under the control of the user to any useful > extent. > > So please don't just assume that using a USB cable for charging only solves > anything. > > Note that the above comments are also generally applicable to *all *cables, > including power > cables, that are plugged into *any* digital device. I could not agree more. Shielded cables helps a lot. We used to have issues at the radio club with Ethernet cables, but as we shifted to shielded cables with reduced the noise level considerably. Ferrite helps to suppress common mode currents, but the milage may vary depending ont he ferrite material. There is USB isolators, which breaks "ground loops" (sigh), and that do helps on the low frequency side of things, but not necessarilly at HF, where the isolation is just a capacitive gap which couples fairly well. One thing that does help is not to have unnecessary rise/fall times of signals. Cheers, Magnus ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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, but from *all* the digital activity within the device, and will be present whether or not USB communications are going on. The keys to controlling this problem are: 1) Shielding on the USB cable. 2) Proper design inside the USB device, rarely done beyond the point of (barely) meeting government regulations, which are far too forgiving IMHO. 3) Use of a ferrite choke on the cable to reduce those residual currents that get by anyway. Note that only item 3 might be under the control of the user to any useful extent. So please don't just assume that using a USB cable for charging only solves anything. Note that the above comments are also generally applicable to *all *cables, including power cables, that are plugged into *any* digital device. DanaK8YUM On Fri, May 18, 2018 at 5:15 AM, David J Taylor via time-nuts < time-nuts@febo.com> wrote: > 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 > = > > Clay, > > I have all three of these units, all powered off USB. I don't see any > reason why you shouldn't use a USB cable with just the DC part connected, > so that there's no issue about radiation. A standard USB port would only > supply 0.5A so that's an upper limit on the power consumption. If it's a > very long USB cable (you mention mast-head) check the resistance. > > As a crude guide... > > - The (larger box) NTP server feels cold to the touch. > > - The smaller, single output frequency source feels very slightly warm to > the touch (feeding an Icom IC-R8600) > > - The larger, dual-output frequency source feels slightly warm to the > touch. > > There's an e-mail address where you could ask: supp...@leobodnar.com > > Cheers, > David > -- > SatSignal Software - Quality software written to your requirements > Web: http://www.satsignal.eu > Email: david-tay...@blueyonder.co.uk > Twitter: @gm8arv > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/m > ailman/listinfo/time-nuts > and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[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 unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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 = Clay, I have all three of these units, all powered off USB. I don't see any reason why you shouldn't use a USB cable with just the DC part connected, so that there's no issue about radiation. A standard USB port would only supply 0.5A so that's an upper limit on the power consumption. If it's a very long USB cable (you mention mast-head) check the resistance. As a crude guide... - The (larger box) NTP server feels cold to the touch. - The smaller, single output frequency source feels very slightly warm to the touch (feeding an Icom IC-R8600) - The larger, dual-output frequency source feels slightly warm to the touch. There's an e-mail address where you could ask: supp...@leobodnar.com Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk Twitter: @gm8arv ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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 opinions. I hate spam. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
