[time-nuts] NS3kview Software for CW25 receiver

Hello, I’m using the NavSyncview software with the FTS125 GPS module. Is it possible to set the time readout on the NavSync software to a local time? I actually need UTC plus 8 hours. It’s at UTC and I cannot see any way of changing it. Best Regards Garry

[time-nuts] Low Noise 10 MHz Distribution

Hello, Since the questions has been asked I will reply also apologies for the “advert” We make ultra low noise distribution amplifiers. 1 Hz noise is –135 dBc and we can achieve –172 dBc noise floor if we carefully set all the gains. www.ptsyst.com/DA1-100-10-B.pdf But these are expensive

[time-nuts] NMEA Software

Hi, Apologies if this has been asked 1000 times before. Is there any good software for reading the NMEA or Motorola binary code out of a M12M. I have winoncore, but wondered if there was anything a bit more modern. Regards Martyn ___ time-nuts

[time-nuts] GPS/Glonass/Galileo GPS Receiver

Hello, Has anyone tried the NV08C-MCM GPS receiver chip? I’m interested in a chip that will work with all the different satellite systems. Regards Martyn ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

[time-nuts] Distribution Amplifier Phase Noise

Hello, Here's a timepod plot of my own amplifier that my company sells www.ptsyst.com/phasenoise.pdf Note this is a distribution amplifier with about 7 dB of gain. We can get the floor to about -174 dBc if we reduce the gain to unity. Best Regards Martyn

[time-nuts] Phase Noise of 74AC gates

Hi All, I read Garry's email about using the 74AC04 as a distribution amplifier. Did I read it right, does Gary say you will get -178 dBc/Hz at 10 kHz offset??? Being one of only 3 or 4 companies in the world that manufactures distribution amplifiers that break the -170 dBc/Hz region at 10

[time-nuts] 74AC gates phase noise

Garry, Are you also saying your 100 MHz OXCO is making -178 dBc/Hz? Unless your 100 MHz OXCO is some special $10k type, there's no way your OXCO has a -178 dBc/Hz floor noise? Regards Martyn ___ time-nuts mailing list -- time-nuts@febo.com To

[time-nuts] 74AC Gate Noise

Hi, I stand corrected. Indeed Garry does make ULN 100 MHz OXCO's. Garry I've already sent you an email directly to see if you can help me with another part I need. Best Regards Martyn This Email is from: Martyn Smith Precision Test Systems LTD

[time-nuts] DIY Frequency Counter

Gerard, I just read your post about your DIY counter and asking for help. I'm not sure when you actually wrote it. I'm based in Chelmsford Essex and can give you some help. I have multiple frequency standards as well as 4 x SR620 timer counters. Let me know if I can be of help. Regards

[time-nuts] Allan Variance

Hello, Can anyone recommend software to calulate the Allan varaince from a set of data? I have taken many measurements with the SR620 using it's 500 second gate and downloaded the results into Excel. I can use the SR620 itself to calulate the Allan Variance. However, I want to know the

[time-nuts] New 10 MHz Distribution Amplifier

I read with interest about the new 10 MHz distribution amplifier. But I agree with everyone, it's the specs that are missing that are important. But I wanted to take one comment up about AGC. My company makes a nice distribution amplifier and we do have AGC. The nice thing here is that a +7

[time-nuts] Importing into EEC

$1 to CE mark a product. And if we add one small option, it must be CE marked again. To the small manufacturer, this kills us and doesn't allow us to offer low prices. Steve Best Regards Martyn This Email is from: Martyn Smith Precision Test Systems LTD Tel: +44 (0) 1245 329608 Email

[time-nuts] CE Mark

Sorry you are wrong. There is no exemtion for CE marking. Nothing is excempt. All test equipment, all electronic equipment, even toothpaste must be CE marked. There is no exemtion for personal use. You maybe are getting confused with RoHS where test equipment is exempt. Martyn

[time-nuts] Spellimng Mistakes

Hi All, Yes I can't spell. I've just realised my spell checker isn't working. Not only can't I spell, I can't type!!! I did mean exemption if my previous email. Best Regards Martyn Best Regards ___ time-nuts mailing list --

[time-nuts] HP3048A Phase Noise Test System

Hello All, I have a couple of HP3048A with option 301 phase noise test sets. I run the systems on HP Brio computers with a GPIB interface, running Windows 95. I bought the units as working systems and have no knowledge on the 3048A software and how it works. I want to upgrade the system

[time-nuts] HP82335 HPIB Card

Hello, I'm trying to get a 82335 HPIB card to run on my computer. The card works in an old computer running windows 95, so I know the card is ok. I have a Pentium 3 running windows XP home edition. This computer has an ISA connector, so the HPIB fits ok. But the computer just doesn't

[time-nuts] Any 3048A experts out there??

Hello, I have a working 3048A phase noise test set. I'm trying to get a new computer to work with the system. I have finally got the computer to talk to the HPIB 82335A HPIB card. I am using windows 98. When I run the PN.exe program, it immediately says that it can't find the HPIB card.

[time-nuts] HP3048A Fixed

Hello, Re my email on the 3048A software. I got the unit to work. I have to start windows 98 in dos mode. Don't know why but I'm happy with that. It would be nice to have windows running properly, so if anyone does know the answer, that would be great. Regards Martyn

Re: [time-nuts] BVA Oscillaotrs

Hello, Today many manufacturers are producing 10 MHz oscillators that offer many advantages over BVA. Phase noise of -116 dBc @ 1 Hz with a -175 dBc noise floor, ageing of 5 x 10E-9 per month and a G sensitivity of 5 x 10E-11 /g in all axis is available on a new product. Also the short term

[time-nuts] Low Allan Dev Oscillators

Hello, I mentioned about there being other low Allan Dev oscillators available on the market. Said asked me to supply some results (And Yes Said, I meant 1 x 10E-13) I'm not sure if attachments work on timeouts, so I have put a couple of graphs on my website. These graphs show typical results

Re: [time-nuts] Low Allan Dev Oscillators

Hello, Re my last post about low noise 10 Mhz oscillators. I found a better PN plot of our 10 MHz oscillators. www.ptsyst.com/10MHzPN-2.pdf Unfortunately don't have the Allan Dev for this one. Best Regards Steve ___ time-nuts mailing list --

[time-nuts] Low Allan Dev Oscillators

Hello, My colleague Steve posted an Allan Dev plot of one of our 10 MHz oscillators. It showed a funny hump at the beginning of the measurement. The hump is just because the units were still warming up. They hadn’t been on long before I started the measurement. The problem is that we

[time-nuts] 1 pps correction

Hello, I’m a bit new to GPS receivers. I’m reading all about sawtooth correction of the 1 pps output signal, on the ilotus M12M or M12+. I understand that correction can either be hardware controlled or software controlled. Does anyone make a low cost stand alone board to carry out this

[time-nuts] Motorola M12+ or M12M questions

Hello, I have been asked a question from a friend and would like to hear what the time-nuts have to say about the M12+ and M12M GPS receivers. His questions were: 1) It would be great if you could outline the broad algorithm and bits of information that go into keeping the 1 pps aligned to

[time-nuts] 1 pps accuracy to UTC

Hello, I may have asked this before, but still haven't got an answer. The Motorola M12+ or M12M quote 20 ns accuracy to UTC. I have two receivers running off the same aerial through a GPS splitter. If I measure the 1 pps signals on my SR620 counter (single shot), they are up to 100 ns out.

[time-nuts] Any HP8561B Experts out there

Hello, I just bought a HP8561B on ebay but it has a few faults. 1. The unit powers up and basically operates ok. But after a while, it turns off, turns back on, goes through the start sequence, and then stays on for a few minutes and turns off again. It cycles through this. 2. Sometimes

[time-nuts] Accurate 1 pps signals

Hello, I am trying to achieve accuracy with two frequency standards disciplined to GPS. I am trying to get their 1 pps outputs close to each other as possible. The idea being you put each unit in a different part of the world and the 1 pps outputs are sycronised. So far I have two units

[time-nuts] Frequency Acuracy at short gate times

Hello, Can anyone advise how I can measure the frequency accuracy of my 10 MHz standard at gate times of 1 ms and 100 microseconds. I have the Wenzle program that calulates Allan Variance from phase noise, but don't know how reliable that is. The 1 second Allan Variance is about 1.2 x

[time-nuts] GPS over fibre optic. Help

Hello, I am using my GPS disciplined rubidium frequency standard with a fibre optic transmitter and receiver. The Tx and Rx is connected between the antenna and the frequency standard with a meter of fibre optic cable. The Tx and Rx devices are especially designed for the GPS frequency and

[time-nuts] Fibre Optic solved

Hello, I asked a question about fibre optic, but the problem has been solved. It had nothing to do with the fibre optic unit. But if anyone does have any thoughts on using a fibre optic link, and any pitfalls, I'd be intertesed. Cheers Martyn

[time-nuts] Galileo and GPS

Hello, Will exisitng GPS receivers (Motorola M12M for example) be able to work with the new Galileo system when it comes on line. I know the systems are compatible, but not sure about older GPS receivers. Any help appreciated Martyn ___

[time-nuts] Galileo and GPS

Hello, Thanks Bj?rn, Magnus and Said for the input. That's another upgrade I'll (not) look forward to. Martyn ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow

[time-nuts] Galileo

Hello, I knew it would happen. A customer has just asked for a GPS system based on Galileo. What's the staus of Galileo? When is it expected to be running? Does anyone know of Galileo GPS receivers or dual receivers? Thanks Martyn ___

[time-nuts] Temps Atomique International

Hello, I have a question about TAI (Temps Atomique International) time. As I understand it TAI is UTC time without the leap seconds. Is that correct? So is that the same as GPS time? I need to be able to generate accurate TAI time as opposed to UTC time. I'm a bit confused as to what the

[time-nuts] GPS time, UTC and TAI

Helo, Re my last question. I've read that GPS time is ahead of UTC time by 15 seconds and TAI time is ahead of UTC by 34 seconds. I need to generate time to a display based on TAI time. Any ideas how I can do that with a normal M12M GPS receiver. Martyn

[time-nuts] Allan Deviation Calulations

Hello, I'm trying to measure the Allan Deviation of an amplifier and need help with the maths. My measurement process uses the SR620 in time interval mode and I make one measurement per second for about a day. I then use Ulrichs excellent plotter to calculate the Allan Deviation. The Allan

[time-nuts] SR620 Floor Noise

Hello, My measurement technique is from Stanford's own application note. The two 10 MHz are fed to Ch A and B. The measurement is a time interval gated at 1 kHz from the SR620's ref out. So we make 1000 measurements per second. So the one shot 25 ps SR620 spec is reduced by square root of

[time-nuts] M12M Sensitivity

Hi, I'm looking for the sensitivity specification of the Synergy M12M GPS receiver. Has anyone data on this. I can't find it in any brochure or manual. Regards Steve ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

[time-nuts] 8713C Network Analyzer Circuits

Hello, Has anyone out there circuit diagrams for a HP8713C network analyzer? The generate port is fine, but the transmission or RF IN port is faulty below about 1.5 GHz. It's response is all over the place. Above 1.5 GHz it seems to be fine. I suspect the A5 receiver especially the RF input

[time-nuts] Pulse Per Minute

Hello, I need to produce a pulse per minute, derived from 10 MHz or 1 pps. So a divide by 60 if 1 pps is used. Does anyone make such a divider? That would save me from designing my own. Regards Steve ___ time-nuts mailing list --

[time-nuts] Allan Variance versus Allan Deviation

Hello, I'm trying to compare the stability specifications of two oscillators. The first spec is 2 x 10E-11 Allan Variance. The second spec is 3 x 10E-11 Allan Deviation. As Allan deviation (ADEV), is the square root of Allan variance, I thought the first spec is the better of the two, but a

[time-nuts] Allan Deviation

Hi, Thanks for the answers but I'm still confused. The Stanford PRS10 has an Allan Variance of 2E-11 but a Symmetricomm unit has a Allan Deviation of 3E-11. So according to the answers you gave, the Symmetricomm unit has a stability thousands of times better than the PRS10. This, dispite

[time-nuts] Allan Variance

Hello, The answer to my original question is that Allan Variance is not to be used but rather Allan deviation. However, David Allan does not mention Allan Deviation on his website, only Allan Variance. Also I spoke to the designer of the PRS10 and he definitely said his specs are Allan

[time-nuts] Allan Variance vs Allan Deviation

Hello, Sorry that I'm harping on about this subject but I want to make sure my brochures are correct. I use the SR620 to measure Allan Variance. When I look at the SR620 manual the formulae they give for Allan Variance is actually root Allan Variance. So root Allan Variance is the same as

[time-nuts] Web Site address

Robert thanks for telling me my typo. Should be www.ptsyst.com. I'm glad you agree. I'd like to see what everyone else says then I can tell the customer he's wrong, with confidence!!! Best Regards Martyn This Email is from: Martyn Smith Precision Test Systems LTD Tel: +44 (0) 1245 329608

[time-nuts] Cesium Oscialltors and Low Phase Noise Frequency Standard

10 MHz oscillator. It makes -121 dBc/Hz @ 1 Hz. Noise floor is only -162 dBc/Hz at the moment, but we are working on reducing this a further 5 to 10 dB. Enter your order number here.. Best Regards Martyn This Email is from: Martyn Smith Precision Test Systems LTD Tel: +44 (0) 1245

[time-nuts] Cesiums's

Rick, Your just the person I need Any chance of a cesium before Christmas? Seriously, I do know how complicated they are. Although we supply hydrogen masers, everyone prefers cesium's. Also I hear there's a large inquiry out there for tens of units. Maybe 100's. The goods news on our

[time-nuts] 1. Re: need recomendation for a portable 10mhz reference

oscillators for under $1000, the cost is not as much as what would be needed to keep an OXCO. Best Regards Martyn This Email is from: Martyn Smith Precision Test Systems LTD Tel: +44 (0) 1245 329608 Email: [EMAIL PROTECTED] Web: www.ptsyst.com NOTICE - This message contains legally privileged

[time-nuts] Ultra Ultra Ultra Very Low phase noise 10 MHz oscillator (Low Noise Option)!!

at 1 Hz with a -183 dBc/Hz floor noise. Now that's what I call low noise. Anyone know any more about this? I'm trying to make contact with the guy but no success yet. Best Regards Martyn This Email is from: Martyn Smith Precision Test Systems LTD Tel: +44 (0) 1245 329608 Email: [EMAIL PROTECTED

[time-nuts] New Question on HP3048A Phase Noise Test Set

. This takes some 40-50 pages of my forthcoming book on phase noise and frequency stability in oscillators. You can't enter an order number, you must wait for Cambridge University Press, which is a non-profit company. Cheers, Enrico On 6 Dec 2007, at 15:12 , Martyn Smith wrote: Hi

Re: [time-nuts] time-nuts Digest, Vol 42, Issue 39

John, I've tried different level spurs from -40 to -120 dBc. From -40 dBc to -100 dBc the spur, as shown on the HP3048A, is always 6 dB lower than it really is. So if I put a -40 dBc spur in, the HP3048A says its -46 dBc. However, when I try from -100 to -120 dBc, the spur is a bit random and

[time-nuts] Allan variance Vs Plain Old Accuracy

Hi All, This comment is bound to get you all going. Maybe I'm being stupid, but why does everyone use Allan Variance and not plan old accuracy? I am very familiar with David Allan's full article on Allan Variance. However Allan Variance isn't the same as accuracy. Accuracy is what is important

Re: [time-nuts] time-nuts Digest, Vol 43, Issue 35

Pete, That's my point. Tom has plotted Allan Variance. I have plotted frequency accuracy. I get similar Allan Variance results to Tom. But if I just measure the accuracy, e.g peak to peak frequency variations, rubidium's out- perform OXCO's even when both are disciplined to GPS. I hope I'm

Re: [time-nuts] time-nuts Digest, Vol 43, Issue 36

In replying to Didier's question. The SR620's reference is my in-house standard. In fact a Russian high performance rubidium that has been drifting 5E-13/month for the past five years. It's now ten years old and I will very much miss it when it finally dies as it is very stable. The

Re: [time-nuts] time-nuts Digest, Vol 44, Issue 6

David, I'm sure I can find you an oscillator. Give me a call on 01245329608 to discuss your requirements and budget. Best Regards Martyn ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] time-nuts Digest, Vol 44, Issue 7

David, Got it. OXCO will leave tomorrow via special post. Full specs and pin-out are included. Best Regards Martyn ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

[time-nuts] Measuring 10 MHz accurately.

Hi, Two questions for all of you today. 1st Question I can measure 10 MHz frequency to an accuracy of about 2 parts in 10E-12 in a one second gate time. I use a SR620 time interval counter and make a timeAB measurement. I make two measurements of phase (between my UUT and my reference) and

[time-nuts] Plotting csv files

Hi All, I have an ongoing problem and realized why don't I ask the time nuts!! My frequency and temperature data is usually plotted in a comma separator value (csv) file. I use excel to import and plot the results. Excel only lets me plot 32000 points at a time. I often have over a million

[time-nuts] Measuring 10 MHz

Hello, Thanks to all for your replies and suggesting especially Brooke, Bruce and Pete. I am already using the Stanford technique with the 1 kHz output. That's how I get 2 x 10E-12/sec accuracy. Using this technique, the accuracy should be 7.9 uHz at 10 MHz (7.9E-13). But I don't reliably

[time-nuts] 10 MHz Oscillators

Hello, Ulrich was asking about 10 MHz oscillators. We make a 10 MHz OXCO that has –118 dBc @ 1 Hz with a –175 dBc noise floor. Not cheap though. Also Low G sensitive oscillators. 5 x 10E-11/g. Contact me off list as I’m trying not to advertise on this forum. Best Regards Martyn

[time-nuts] 100 MHz Oscillators

Hello, I’m responding to John Miles comment about 100 MHz oscillators. We’ve managed to design a 100 MHz OXCO that makes –140 dBc @ 100 Hz with –182 dBc @ 1 MHz. We also have a design on the table that should improve the 100 Hz to –145 dBc, but haven’t had the time or money to actually build

Re: [time-nuts] 1 PPS Correction Problem using DS1123LE-50 Delay Line

Hello, I am using a LEA-6T GPS chip with the DS1123LE-50 delay line to correct the jitter of the 1 pps output from the GPS chip. The correction works very well, dropping the peak to peak jitter of the 1pps output from about 20 ns to 3 ns. However, I randomly get a big jump of the 1 pps

[time-nuts] 3048A Expert Needed

Hello, I have both the HP3048A and Timepod Phase Noise test Sets. I have two low noise 100 MHz PLL's. The 100 MHz output is locked to a 10 MHz reference input. I want to measure their phase noise. Their spec is -100 @ 10 Hz with a -168 noise floor. I connect both 100 MHz outputs to the

Re: [time-nuts] L1 and L2 frequencies

Hello, I have some questions on GPS and GNSS. Do all the civilian GPS receivers only operate on the L1 frequency? Are there any GPS frequency standards out there that use L1 and L2 and that can be purchased by non-military customers? I am playing with the new Lea-M8T receiver. How do I know

Re: [time-nuts] 50 ohm driver

you need a medium power transistor amplifier or opamp. Bob On Wednesday, March 4, 2015 6:09 AM, Martyn Smith mar...@ptsyst.com wrote: Hello, A quick question. My output driver for a simple amplifier. I use three gates (in parallel with resistors) from a 74AC14 to give me about 0

[time-nuts] 50 ohm Driver

Hello, A quick question. My output driver for a simple amplifier. I use three gates (in parallel with resistors) from a 74AC14 to give me about 0-3.2V into 50 ohm. I want to have a driver that gives me a full 0-5V (at least 0-4.5V) swing into 50 ohms. Can anyone recommend an IC that can

[time-nuts] M12+ Site Survey

Hello, I apologize if this question has been asked before. I have a frequency standard that uses the M12+ to discipline a rubidium oscillator. I set the M12+ to do a site survey and then set it to position hold mode for best accuracy. My question is: If I then move the unit, for example 30

[time-nuts] 3 corner hat for phase noise

Hello, Does anyone have an EXCEL spreadsheet that calculates the individual phase noise of 3 oscillators when they are compared against each other, e.g A vs B, A vs C, B vs C. I.e the 3 corner hat technique. I do have a Timepod and I thought Timelab could do that, have haven't found how

[time-nuts] Timepod Phase Noise Measurements and 3 corner hat

frequency standards as I will always use the 3 source method of measurement on the timepod. John have saved me about 10 hours a week of measurements!!! Regards Martyn Smith ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https

[time-nuts] 3 corner hat

. The Timepod is the worlds best bit of electronics ever, and if John Miles was English, I would recommend him for a knighthood. John, hope you're blushing now. Regards Martyn Today's Topics: 1. measuring os latency for pps (folkert) 2. 3 corner hat for phase noise (Martyn Smith) 3. Re: SRS PRS10

Re: [time-nuts] 3 corner hat for phase noise

Hello, I asked for a 3 corner hat measurement for phase noise. Managed to work it out myself. In case anyone else wants to know: First of all Timepod does do it but only for Allan Deviation. But I wanted it for phase noise. So if you make three phase noise measurements A vs B (call result

Re: [time-nuts] 3 corner hat

Hello, Re my measurements with the timepod. John Miles has now saved me a ton of work by telling me how to using three sources in the timepod, to automatically get the absolute phase noise of a device (without having to result to 3 corner formulae). John, I have one more question. What about

[time-nuts] Connor Winfied FTS125

Hello, I use the Connor Winfield FTS125 Disciplined GPS module in a system we make. I have three customers all complaining about the same thing. The NMEA output suddenly stops for no reason. It needs a power cycle to restore. But it only occurs every few months and at completely random

[time-nuts] Timepod

Hello, I'm just about to order a timepod at $9400 from Micro Semi. Does any one have a used one for sale? Best Regards Martyn  Precision Test Systems UK & USA Contact Details: This email is from Martyn Smith United Kingdom  Precision Test Systems Ltd The Studio, Whitehouse Farm, New

[time-nuts] 10 MHz to 32.768 kHz converter

Hello, First of all quick apologies for sending an email last week without deleting all the old information from previous postings. I have been playing around with producing 32.768 kHz from 10 MHz using a PIC chip. I have a real time clock calendar chip that requires a 32.768 kHz

[time-nuts] PRS10

Hello, I have a strange fault on a PRS10. Wondered if anyone had seen it. I am running a PRS10 and at the same time monitoring its FC (the frequency control value) and Status byte data values. So normally, the Status shows are all zeros, except 2nd from last is a 1, showing the unit is not

[time-nuts] OXCO Spurious Output at Line Frequencies

Hello, I have a customer who is measuring the phase noise of my 10 MHz ultra-low phase noise frequency standard. He is seeing spurious signals at line frequencies (50 and 100 Hz as we are in Europe) at a level around -130 dBc. My opinion is that it's impossible to get much better than that.