Re: [time-nuts] Loran C returning to a station near you...

to reinstate Loran-C as eLoran. David N1HAC On 7/14/15 6:49 PM, Bob Camp wrote: Hi Not to be to much of a downer here but ….. Loran for timing and an “Eastern WWVB” are two projects that seem to each have a life of their own. They seem to come up on some sort of cycle related to sun spots. Both have

Re: [time-nuts] Loran and SRS FS700 in the UK

On 11 Jul 2015 03:28, GandalfG8--- via time-nuts time-nuts@febo.com wrote: This is a reply to the topic Loran-C reception in the UK with specific emphasis on the Stanford Research FS700. Points to note. All three of my units seem to have the Option 01 oscillator fitted, although only

[time-nuts] Isolation and insertion loss of Minicircuits ZFSC-16-3 and ZFSC-16-3 16-way splitters @ 10 MHz

Dr. David Kirkby Ph.D CEng MIET Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, Essex, CM3 6DT, UK. Registered in England and Wales, company number 08914892. http://www.kirkbymicrowave.co.uk/ Tel: 07910 441670 / +44 7910 441670 (0900 to 2100 GMT only please

Re: [time-nuts] Number of GPS sats in the sky?

given the numbers for GPS, Bob, but don't forget that later ublox receivers can also work with GLONASS and other GNSS systems. If you have a limited view, adding in these other satellites may provide more usable signals and hence less chance of dropouts. 73, David GM8ARV -- SatSignal Software

[time-nuts] LORAN-C reception in the UK

How good/bad would a LORAN-C frequency reference such as the Stanford Research FS700 work in the UK? I live about 60 km to the east of central London. Is there any future for LORAN-C in the UK? I am looking for a frequency reference that is not GPS - I already have a GPS frequency reference but

Re: [time-nuts] End Of The World

/onlinepubs/9699919799/utilities/sleep.html#tag_20_118 however, it's pretty widely supported these days. David. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow

Re: [time-nuts] End Of The World

for this behavior. Perhaps someone knows why this happened and can explain? Thanks much to all for the enjoyment of and knowledge I've gained from reading postings on this list! David Stell Oklahoma City -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob

Re: [time-nuts] Greetings from Australia

1/10 second, which can be easily achieved running NTP on Windows PCs. Having a local GPS-locked stratum-1 server based on a PC (Windows or Linux) or Raspberry Pi makes this independent of needing an Internet connection - e.g. for field work. Cheers, David -- SatSignal Software - Quality

Re: [time-nuts] windows and leap seconds

. http://www.meinbergglobal.com/english/sw/ntp.htm#ntp_stable http://www.satsignal.eu/ntp/setup.html Cheer, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk

Re: [time-nuts] potential source for cheap copy of labview

-hardware.html Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin

Re: [time-nuts] potential source for cheap copy of labview

On 20 June 2015 at 04:18, Bob kb8tq kb...@n1k.org wrote: Hi It is interesting as you go through the various student and home versions, just how hard it is to figure out what you are (and are not) buying in each case. One example would be the inclusion (or not) of GPIB capability. One would

Re: [time-nuts] Raspberry Pi tweaks and custom kernel, was RE: PPS for NTP Server - How Close Is Good Enough?

with the RPi (-19 microseconds with the BBB, -1 to +24 microseconds with other GPS-synced systems). I don't think either system is good enough as a microsecond level server, but either is fine for tenth millisecond level. Cheers, David -- SatSignal Software - Quality software written to your

Re: [time-nuts] Raspberry Pi tweaks and custom kernel, was RE: PPS for NTP Server - How Close Is Good Enough?

level. The BBB generated sufficient RF interference to stop a near-on-board GPS from working. I have had no overheating troubles with the 9 RPi systems here, none have needed added cooling, and none have burnt out. One is even running Windows-10 IoT. Cheers, David -- SatSignal Software

Re: [time-nuts] Raspberry Pi tweaks and custom kernel, was RE: PPS for NTP Server - How Close Is Good Enough?

willing to be convinced otherwise, though. Recompiling is a long and painful process, and cross-compiling presents further problems! Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk

Re: [time-nuts] Firmware for TymServe 2100

Yes please. I could also use it. Thanks, David On Jun 11, 2015, at 12:45 PM, Gerhard Wittreich gerh...@wittreich.org wrote: Sean, I have it (but not with me) and can send it directly to you this evening. I will also gladly post if anyone else is interested. Gerhard R Wittreich, P.E

Re: [time-nuts] z3801a - serial help and for sale

: James C Cotton jim.cot...@wmich.edu To: Discussion of precise time and frequency measurement time-nuts@febo.com Cc: Date: Wed, 10 Jun 2015 16:26:17 -0400 (EDT) Subject: Re: [time-nuts] z3801a - serial help and for sale. David, Using a USB dongle with an Apple Mac Laptop works fine for me

Re: [time-nuts] z3801a - serial help and for sale

Where on the planet are you? I'm in UK so if you are in USA shipping will make it uneconomic. Regards, David Partridge -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of David Andersen Sent: 11 June 2015 21:39 To: time-nuts@febo.com Subject: Re: [time

Re: [time-nuts] PPS for NTP Server - How Close Is Good Enough?

Do you think it is OK to consider a pulse which arise 250 ns early to be close enough? For NTP usage that will be no problem whatsoever. Dave ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] PPS for NTP Server - How Close Is Good Enough?

thank you in advance for any advice you offer. Ed ___ Yes, Ed, if you are within a microsecond for the PPS input to your Raspberry Pi that's fine. Don't forget it's a 3.3 V level. Cheers, David -- SatSignal Software - Quality software written to your

[time-nuts] z3801a - serial help and for sale.

I'm throwing my hands up in the air - I don't have the time to wrestle my silly mac into trying to talk to the box, unless someone has quick advice on something I might be doing wrong. z3801a, jumpered to RS232, modified with an internal switching power supply (see photos below). Power light

[time-nuts] Symmetricom SGC1500 Smart Grid Clock- Not Booting

in here- or what model it could have been. Any info would be nice. Thanks- David ___ 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] Performance of 74LVC series ICs

of the dual 74LVC74. With the inputs of the unused section connected to ground or Vdd, it will draw no power. David N1HAC On 6/8/15 8:30 PM, Dan Watson wrote: I have something of a follow up question. How good is the isolation inside these devices (74LVC, SOT-23 package) between gates

Re: [time-nuts] Using CPLD/FPGA or similar for frequency divider

I'm up for either ... My thoughts are to try it out on a development board and if it works, maybe build a few for possible sale, and also release Gerbers and VHDL files. Regards, David Partridge -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of cfo

Re: [time-nuts] Using CPLD/FPGA or similar for frequency divider

My reading so far of what's been said in this thread is that you might get good results using a CPLD/FPGA as a divider but ... . Bruce pointed me to Rubiola's paper http://rubiola.org/pdf-articles/conference/2013-ifcs-Frequency-dividers.pdf, and while I'm sure the lambda divider is excellent,

Re: [time-nuts] METAS tour report (was Tour of METAS (Swiss Federal Institute of Metrology) time lab: any questions or requests?)

and I'd be happy to do what I can to answer. Cheers! -Pete ___ A most interesting report and photos, Pete, for which many thanks. Sobering to learn how DCF77 and GPS have affected the need for the Swiss time service. Cheers, David -- SatSignal Software

Re: [time-nuts] Thunderbolt/Arduino RS232 Interface Issue

Is the shield explicitly powered? It may be being phantom powered from the control lines when connected to the PC which are not present when connected to the Thunderbolt. David McGaw N1HAC On 6/3/15 12:38 AM, Dan Quigley wrote: Hello, I'm integrating an Arduino (Due/Mega have tried both

Re: [time-nuts] USB problems and solutions - Some what Off Topic

. - SD cards - cheap or not well mounted. The RPi 2 uses a micro-SD card with a much more secure mounting. Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk

[time-nuts] Using CPLD/FPGA or similar for frequency divider

Is this a sensible thing to consider doing? Or would I be better sticking to AC/HC/AHC/LVC logic? Regards, David Partridge ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

Re: [time-nuts] Small time server for mobile use.

___ Raspberry Pi perhaps? http://www.satsignal.eu/ntp/Raspberry-Pi-quickstart.html Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk ___ time

Re: [time-nuts] USB problems and solutions - Some what Off Topic

likely be changed. Regards, David Partridge -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Cash Olsen Sent: 29 May 2015 20:18 To: time-nuts@febo.com Subject: [time-nuts] USB problems and solutions - Some what Off Topic I have been plagued with hard

Re: [time-nuts] LTC6957 internal architecture

With all this talk of the LT6957 I'm wondering if there's interest in a re-spin of my frequency divider with one of these at the front end instead. Regards, David Partridge -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bruce Griffiths Sent: 26 May

Re: [time-nuts] iGPS?

On Mon, May 18, 2015 at 09:52:03PM -0700, Jim Lux wrote: Why iridium? Why not Sirius or XM or DBS. Unless you want something world wide, as opposed to populated areas served by broadcast radio and TV Well it seems to me I remember Iridium is time domain duplex around 1610 MHz or

Re: [time-nuts] Small time server for mobile use.

Mark- You might want to look at FEI-Zyfer, and their Nanosync line of products http://www.fei-zyfer.com/time_sync.htm I'm not sure about the pricing, but they look to meet your other requirements Dave On Tue, May 12, 2015 at 1:11 PM, Mark Spencer m...@alignedsolutions.com wrote: Hi sorry

Re: [time-nuts] Divider circuit for Rubidium Standard

That's one of the reasons I was considering a re-spin of the board using a better ZCD solution. Dave -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Richard (Rick) Karlquist Sent: 05 May 2015 05:10 To: Discussion of precise time and frequency

Re: [time-nuts] Microsemi versus Spetracom

I had this happen with my S250. It hangs during boot with the spinning hourglass stopping, right? The problem ended up being that the processor module had come slightly unseated. The initial boot messages on the display are independent from the functioning of the processor module. Thanks, David

Re: [time-nuts] Tektronix Sample Heads

I doubt there is any information, but the place to ask is the Tekscopes group on Yahoo! Also Tekscopes2 (schism) also on Yahoo! Regards, David Partridge -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Daniel Mendes Sent: 24 April 2015 04:01

[time-nuts] I wish to shorten GPS antenna cable - should I let receiver find the position again?

I have an HP 58503A which I am using as a frequency source only - not to tell the time. I want to shorted the antenna cable a bit, but are wondering if I should let the GPS receiver finds it position again. Or either of the following better * Remove antenna cable, put a new N plug on, and screw

Re: [time-nuts] Visual clock comparison

users, and they have achieved 2 milliseconds in tests. https://tech.ebu.ch/docs/techreview/trev_2009-Q1_HD-Audio-Delays.pdf Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk

Re: [time-nuts] Visual clock comparison

/disk.html#TinyBen and a digital clock for Windows and Linux: http://www.satsignal.eu/raspberry-pi/DigitalClock.html I've not written a sound comparison tool for Linux or Windows. Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email

Re: [time-nuts] Modern HW replacement for ATOM based NTP server?

as my dual-core Intel Atom. Jitter reported by NTP is just under 4 microseconds, being limited to the sys_jitter value of 3.8 microseconds. Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk

Re: [time-nuts] Modern HW replacement for ATOM based NTP server?

= Of course, using special software you can achieve better, but you aren't going to get 10 ns accuracy over Ethernet when using the device as an NTP server, which was the original request. I wonder what accuracy the OP requires? Cheers, David -- SatSignal Software - Quality software written

Re: [time-nuts] Mc Coy OCXO in HP equipment.

Here are some details on how the McCoy OSC92-13B is used in the HP 70310A Precision Frequency Reference, and how the OCXO is driven: https://medium.com/@HP70K/70310a-oscillator-investigations-a3bf473459aa Thanks, David Slik VE7FIM On Mon, Aug 18, 2014 at 8:55 AM, ewkeh...@aol.com wrote: I am

Re: [time-nuts] Modern HW replacement for ATOM based NTP server?

support in the community, if you want to use it for other tasks as well, and doesn't suffer from the problem of generating RF interference at GPS frequencies. Both are excellent little devices! Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http

Re: [time-nuts] 58503A alarm light on

On 5 Apr 2015 02:26, Charles Steinmetz csteinm...@yandex.com wrote: One expects a safety factor between the minimum spec and typical operation. I'd be concerned if a 58503 was consistently predicting 2uS (to me, 2uS means I may still meet spec, but I'm not as stable as I should be). Best

Re: [time-nuts] 58503A alarm light on, but :SYSTEM:STATUS? indicates all is ok

On 1 Apr 2015 23:24, Bob Camp kb...@n1k.org wrote: HI Best guess is that your antenna is not doing the job. That's possible. It was supposed to be an Andrews antenna, but there's nothing on it to indicate that to me. But it is well sited. I expect antenna issues can explain the log entry

Re: [time-nuts] Striking change in iPhone time accuracy with 8.2

There is evidence that the ear can discern differences in timing down to the uS range. See a discussion by David Blackmer of DBX and Earthworks: http://www.earthworksaudio.com/wp-content/uploads/2012/07/The-world-beyond-20kHz.pdf David McGaw On 4/1/15 7:11 PM, Chris Albertson wrote

Re: [time-nuts] Striking change in iPhone time accuracy with 8.2

chance, but you could be right. On the other hand, I just checked now and it's 1.9 seconds off. I compare with Emerald Time, which includes my one stratum-1 NTP server in its sources. https://itunes.apple.com/gb/app/emerald-time/id290384375?mt=8 Cheers, David -- SatSignal Software - Quality

[time-nuts] 58503A alarm light on, but :SYSTEM:STATUS? indicates all is ok

suggestions what I can do to try to find why the alarm would be on? Once the LED is on, do they ever go out? I assume its purpose is to indicate there was a problem, rather than that there's currently a problem, but I'm puzzled there's no entry in the log to indicate why the alarm is on Dr. David

Re: [time-nuts] 58503A alarm light on, but :SYSTEM:STATUS? indicates all is ok

On 1 April 2015 at 17:39, Chuck Harris cfhar...@erols.com wrote: I can't help but notice that you have several of these entries: Log 067:20150101.00:00:11: 5V is out of tolerance, value: 5.52 Log 068:20150101.00:00:11: 15V is out of tolerance, value: 19.46 I think you better look into them

Re: [time-nuts] Striking change in iPhone time accuracy with 8.2

server of your choice, but it also has a particularly sharp tick on the seconds, and a different-toned tick at the top of the minute. The clock also has an outer circle that can be configured to complete one rotation every second, which is great for comparing between clocks. -- David Glover-Aoki

Re: [time-nuts] Trimble Thunderbolt question, splitting its output.

, but as there wasn't enough interest so that's not about to happen ... Regards, David Partridge -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Charles Steinmetz Sent: 28 March 2015 19:56 To: Discussion of precise time and frequency measurement Subject

Re: [time-nuts] Trimble Thunderbolt question, splitting its output.

Charles The input impedance of the divider board is nominally 50 ohms (closer to 45 ohms, with 1Vrms drive ??? How do you get to that 45 ohm figure. The input has a pair of 100R in parallel, so I can't see how it can be 45R input impedance. Did you derive that figure based on observing

Re: [time-nuts] Comparing the BeagleBone Black Raspberry Pi as NTPservers

/ntp/BBB-vs-RPi.html Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https

Re: [time-nuts] Comparing the BeagleBone Black Raspberry Pi asNTP servers

From: Hal Murray david-tay...@blueyonder.co.uk said: Perhaps because NTP sees the offset in both send and receive packets and therefore, like any other network delay, it is subtracted out. The description of the change was to remove a delay on the receive side. There was no mention

Re: [time-nuts] Comparing the BeagleBone Black Raspberry Pi asNTP servers

. ?? Perhaps because NTP sees the offset in both send and receive packets and therefore, like any other network delay, it is subtracted out. Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay

Re: [time-nuts] Comparing the BeagleBone Black Raspberry Pi asNTP servers

of significantly reducing that latency, so that the delay reported by NTP is reduced from ~0.51 to ~0.35 milliseconds. http://www.satsignal.eu/ntp/RaspberryPi-notes.html#EthernetLatency Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http

Re: [time-nuts] Comparing the BeagleBone Black Raspberry Pi asNTP servers

things changed between the two OS versions I added a comparison here: http://www.satsignal.eu/ntp/BBB-vs-RPi.html#OS-comparison Many thanks all for your help. Tomorrow I will update the table, and I'm sure that the BBB will win out under both measures. Cheers, David -- SatSignal Software

Re: [time-nuts] Comparing the BeagleBone Black Raspberry Pi asNTP servers

David: On the BBB, were you running the fully loaded release, or the minimum console version of the OS? Which specific version of the OS? Thanks, --- Graham = Graham, The download was: bone-debian-7.8-lxde-4gb-armhf-2015-03-01-4gb.img.xz (547,024,548 bytes

Re: [time-nuts] Comparing the BeagleBone Black Raspberry Pi asNTP servers

David: On this page: http://elinux.org/Beagleboard:BeagleBoneBlack_Debian#BBW.2FBBB_.28All_Revs.29 they list an alternative console only image: https://rcn-ee.com/rootfs/bb.org/release/2015-03-01/console/bone-debian-7.8-console-armhf-2015-03-01-2gb.img.xz It might be easier starting

Re: [time-nuts] Comparing the BeagleBone Black Raspberry Pi as NTP servers

as an NTP server. Thanks, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com

Re: [time-nuts] Comparing the BeagleBone Black Raspberry Pi asNTP servers

David: On this page: http://elinux.org/Beagleboard:BeagleBoneBlack_Debian#BBW.2FBBB_.28All_Revs.29 they list an alternative console only image: https://rcn-ee.com/rootfs/bb.org/release/2015-03-01/console/bone-debian-7.8-console-armhf-2015-03-01-2gb.img.xz It might be easier starting

[time-nuts] Comparing the BeagleBone Black Raspberry Pi as NTP servers

Folks, I've just put up my first draft of a comparison of these two popular devices as NTP servers: http://www.satsignal.eu/ntp/BBB-vs-RPi.html Comments welcomed - I know it's an imperfect test! Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http

[time-nuts] UK 60 kHz MSF outage

I have received the following: UK 60 kHz MSF outage: Mon 2 - Thurs 19 March, 08:00-18:00 UTC - service off-air each day (will be back on air overnight at weekends). Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david

Re: [time-nuts] homebrew counter new board test result

You might wish to look at the LTC6957 as your input shaper device. I think you'll find it far superior to either 74xx logic or fast comparator such as the LT1016. Cheers, Dave ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Frequency Divider Board redux

I've not had any replies on this for a bit, and I have only had interest expressed for a total of 10 boards which isn't an economically viable quantity. So I'm afraid that this won't be going to production unless I get a whole lot more interest. Sorry Dave

Re: [time-nuts] PRS10 Rubidium

Hmmm is it possible that a nearby board had a wet tantalum capacitor (H2SO4 electrolyte) that failed spraying acid? Dave -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Jürg Kögel Sent: 22 February 2015 15:44 To: Discussion of precise time and

Re: [time-nuts] Looking for advice to get a submillisecond setup

... HtH David Partridge ___ 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] Looking for advice to get a submillisecond setup

with a PPS source would meet your needs. There is a quick-start guide for the Raspberry Pi here: http://www.satsignal.eu/ntp/Raspberry-Pi-quickstart.html Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay

Re: [time-nuts] GPS active antenna delay ?

On 18 Feb 2015 04:20, Tom McDermott tom.n...@gmail.com wrote: Hi Dave - agree that VNA is one good way to measure the delay. If required accuracy is less than about 0.5 nsec, then Tx antenna to Rx antenna mutual impedance starts to become an issue. I don't see why. The two antennas can (and

Re: [time-nuts] GPS active antenna delay ?

On 7 Feb 2015 19:18, Tom McDermott tom.n...@gmail.com wrote: Has anyone on the list measured or otherwise estimated the active antenna delay including the amp and filters? -- Tom, N5EG I have never done this, but suspect that using a VNA is the best way to go. With a simple passive dipole

Re: [time-nuts] hackers] MSF Scheduled Maintenance Periods

). https://www.google.com/maps/place/54%C2%B054%2736.0%22N+3%C2%B016%2748.0%22W/@54.9072473,-3.288342,9z/data=!4m2!3m1!1s0x0:0x0 David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk

Re: [time-nuts] MSF Scheduled Maintenance Periods

=== Folkert, I'm not aware of any significant changes. Could it be that you have more interference at 60 kHz than two years ago? Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david

[time-nuts] MSF Scheduled Maintenance Periods

transmission should be resumed overnight and at weekends) See: http://www.npl.co.uk/science-technology/time-frequency/products-and-services/time/msf-outages Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay

Re: [time-nuts] TimeLab with Wine: No RS232 interface available

the problem is more likely to be Wine as multiple programs show the issue, you could try the PuTTY terminal program instead of the rather old HyperTerm: http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html May be better, may not. Cheers, David -- SatSignal Software - Quality software

Re: [time-nuts] 510 doubler and old Toko RF catalogue (Cirkit2nd ed. 1994)

) followed on from CirKit but don't remember if there was a formal connection between the companies or not. Hope that helps, this method to find old data is frequently. David -- ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go

Re: [time-nuts] Help me make some sense of adev measurements of SR620'sown clock

On 25 Jan 2015 23:02, Tom Van Baak t...@leapsecond.com wrote: You're getting 1e-12 at 1 second. Sounds fine to me. Obviously you have the experience to know that 1e-12 at 1 second is fine. But if it's possible, I would like to understand the relationship between the counters specification and

[time-nuts] Help me make some sense of adev measurements of SR620's own clock

After sorting out some GPIB issues, I finally got to be able to make some measurements on my Stanford Research SR620 time-interval counter. I thought it sensible to first try to determine the performance of the counter, which is using its own high stability clock (option 001). So no external

Re: [time-nuts] GPS leap second pending (TBolt/Heather)

/net.htm#NTPLeapTrace Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https

[time-nuts] Some history about the Greenwich time signal....

of the famous Greenwich Observatory was set up at a place called Abinger Bottom to protect the UK’s national timing resource. Article: http://www.electronicsweekly.com/engineer-in-wonderland/general/greenwich-time-signal-lived-surrey-beauty-spot-2015-01/ Cheers, David -- SatSignal Software - Quality

Re: [time-nuts] Current state of optical clocks and the definition of the second

Dr David Kirkby Managing Director Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Chelmsford, Essex, CM3 6DT, United Kingdom Registered in England and Wales as company number 08914892 http://www.kirkbymicrowave.co.uk/ Tel 07910 441670 / +44 7910 441670 (0900-2100 GMT) On 13

Re: [time-nuts] Current state of optical clocks and the definition of the second

On 12 January 2015 at 12:34, Attila Kinali att...@kinali.ch wrote: Hi, I just stumbled over this [1] nice article by Fritz Riehle that might be of interest to others as well. Attila Kinali [1] Towards a Re-definition of the Second Based on Optical Atomic Clocks, by

Re: [time-nuts] Sources for Mission Time Clock

/raspberry-pi/DigitalClock.html Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go

Re: [time-nuts] In search of ways to improve Raspberry Pi stratum 1server

, so it would be interesting to know whether the Raspberry Pi is capable of improved performance using that OS. I would be most interested to know the outcome. Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay

Re: [time-nuts] Mechanical 1PPS Oscillator Disciplining

were achieved with neons and locked multivibrators, where necessary, I believe. [] Alan G3NYK I have one 500 c/s GEC crystal in an octal base which is thinner than a 60 Kc/s one, so a different mode. Never had it working, though. 73, David GM8ARV -- SatSignal

Re: [time-nuts] Mechanical 1PPS Oscillator Disciplining

Hi David yes I think I have seen similar but not as low as that. If you compare the suspension points the different vibrational mode should obvious.the suspension point is at a node. I think some of these are quite difficult to excite, I have not seen any suggested circuits but I have

Re: [time-nuts] Any reason not to use one power amplifier and splitter for distribution amplifier?

On 7 Jan 2015 01:24, Charles Steinmetz csteinm...@yandex.com wrote: Dave wrote: At 50 MHz, the loss from the common port is 12.8 dB, and the isolation between two ports sets of ports is either 38 or 48 dB To get the worst-case output-to-output isolation, you need to test two output ports

Re: [time-nuts] Any reason not to use one power amplifier and splitter for distribution amplifier?

On 8 January 2015 at 10:03, Charles Steinmetz csteinm...@yandex.com wrote: Dave wrote: Yes, but I was aware of this, and that's why I got two different isolation figures. What I was pointing out is that there will be *4* different isolation figures from any one output port, not just two.

Re: [time-nuts] Any reason not to use one power amplifier and splitter for distribution amplifier?

On 4 January 2015 at 02:37, Bob Camp kb...@n1k.org wrote: Hi On Jan 3, 2015, at 6:09 PM, Dr. David Kirkby (Kirkby Microwave Ltd) drkir...@kirkbymicrowave.co.uk wrote: I was looking to make a 10 MHz distribution amp to feed test equipment with the output of a GPSDO. I see this http

Re: [time-nuts] Any reason not to use one power amplifier and splitter for distribution amplifier?

Just to say, the comment on the graphs that the VNA covers 50 MHz to 20 MHz, is obviously wrong. My 8720D covers 50 MHz to 20 GHz. I do have another couple of VNAs here that cover 10 MHz. I will do some more measurements, with a more suitable VNA when I have both splitters here and some time for

[time-nuts] Any reason not to use one power amplifier and splitter for distribution amplifier?

I was looking to make a 10 MHz distribution amp to feed test equipment with the output of a GPSDO. I see this http://m.ebay.com/itm/201244302355 16-way Minicircuits splitter on eBay which I got for $40. I guess the loss is around 12 dB. I actually bought another for $35 which was similar but

Re: [time-nuts] Soekris without a GPS receiver.

in a rather short lifetime. Agreed on the GPS as well - it's the PPS which is required for precise time measurement. David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk

[time-nuts] Frequency Divider Board redux

the number of boards you would want. The last boards from the previous production run (of 100) were selling at around GBP62.50 each EXCLUDING PP. (£75 including PP to anywhere). Fewer boards increases the cost (unfortunately). My email address is david dot partridge at perdrix dot co dot uk

Re: [time-nuts] HP-58503A

On 1 January 2015 at 17:03, Andy Bardagjy andybarda...@gmail.com wrote: Sounds like the GPS receiver is hosed. I think there are two different receivers used in the 58503a, unfortunately I'm away from my lab, otherwise I could check mine. It is a standard part, and may be available on the

Re: [time-nuts] Soekris without a GPS receiver.

want to bother PHK with this as it's likely way in the past for him. Happy New Year! David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk ___ time-nuts mailing

Re: [time-nuts] New Years Eve TV countdown

to the studio, and then delay through Sky satellite TV. The BBC here no longer shows a clock, perhaps partially for that reason. At least there was no leap -second to confuse things! Happy New Year! 73, David GM8ARV -- SatSignal Software - Quality software written to your requirements Web: http

Re: [time-nuts] New GPSDO on EBAY From China

is done by BG7TBL. In his store on taobao.com, there is a adev chart. Please refrer to this link http://item.taobao.com/item.htm?spm=a1z10.3.w4002-1278071728.49.XHJlQLid=42336500072 2014-12-29 1:56 GMT+08:00 Dan Rae dan...@verizon.net: On 12/28/2014 7:25 AM, David Smith

Re: [time-nuts] Soekris without a GPS receiver.

card, and learning more in the process, is why I'm doing this. I hope that is within the remit of this group. Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk

Re: [time-nuts] Soekris without a GPS receiver.

be able to drive the net4501's clock (at some point in the future). Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk ___ time-nuts mailing list -- time

[time-nuts] New GPSDO on EBAY From China

Hello Friends, I found this new inexpensive GPSDO on ebay listed from a seller from China: http://www.ebay.com/itm/GPS-DISCPLINED-CLOCK-GPSDO-10M-OUTPUT-SQUARE-WAVE-/111514491254?pt=LH_DefaultDomain_0hash=item19f6c81976 It looks interesting and tempting BUT the seller doesn't give any spec's

[time-nuts] Downloaded HPs SmartClock / Size of Lucent modules.

I have two queries. Both hopefully quick to answer 1) From what I gather, the HP GPS timing receivers can be observed/controlled with HP SmartClock. But where I download it from? I drew a blank with Google, as well as the Microsemi site http://www.microsemi.com/ which bought Symetricon,

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