Re: [time-nuts] Racal 9475 Rubidium

Most obvious issue - is the Rb "bulb" coated on the inside with a metallic deposit - if so it's time to use a heat gun to move it back to where it belongs. David -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Paul Bicknell Sent: 01 May 2018 10:19 To:

Re: [time-nuts] Environmental sensor recommendations

> The OCXO is not the temperature problem with the Tbolt. It is the DAC. So is there a better one that can be used to replace it? David -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of ew via time-nuts Sent: 05 April 2018 10:43 To: time-nuts@febo.com

Re: [time-nuts] GPS ANTENNA

attenuator with a DC pass. On Sun, Apr 1, 2018 at 10:21 PM, David C. Partridge <david.partri...@perdrix.co.uk> wrote: > Or use a choke ring survey antenna and an attenuator :) > > Dave > > -Original Message- > From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behal

Re: [time-nuts] GPS ANTENNA

Or use a choke ring survey antenna and an attenuator :) Dave -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob kb8tq Sent: 01 April 2018 14:43 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] GPS ANTENNA Hi Indeed,

Re: [time-nuts] Setting correct date on Trimble Thunderbolt receiver

AFAIK you can't set the correct date any more - this is the 1024 week rollover problem. Lady Heather does correct the displayed date, as it knows that the reported date is wrong.. David -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of

[time-nuts] 50 ohm drivers

Brice said: >. Some fast CMOS devices (esp clock drivers) have an output R close to 50 ohms as they are intended to drive 50 ohm source terminated transmission lines. Any in particular that you'd recommend? I need to drive a 50ohm line and a single gate inverter doesn't have the grunt to do so

Re: [time-nuts] LT1016 as a pulse shaper...

You might consider using MC74VHC1GT14 or MC74VHC1G14 (Schmitt trigger inverting buffers) depending on the exact voltage levels. They are fast (74AC logic fast) single gate devices in SC70 (SOT-353) or SOT23-5 case and can drive 25mA output if needed. I've seen documents saying that using fast

[time-nuts] Output impedance of MC74VHC logic?

Using this to buffer output from an LPRO (74VHC1G14 (Schmitt trigger 3.3V TTL compatible)), or an Efratom 105243-003 10MHz OCXO with CMS output (74VHC1GU04 CMOS levels) in a 10MHz mod for the KS-24019 RFTGm-II. To match well to 50R bandpass I want to add a series resistor to the output but don't

[time-nuts] Efratom 105243-003 10MHz OCXO

Does anyone know the specs for the 10MHz output of this? I'm looking at a board using it that is terminating it with a 100kOhm resistor to ground. Yeah I know, probe it with a scope - the catch is that the equipment is currently well disassembled so I can't do that so easily ... Is the output

Re: [time-nuts] Furuno GT-8031 breakout board

Never having opened my TBolt, are the GT-8736 boards of use to replace the aging and partly deaf receiver in that? Or for a KS-24019? Thanks Dave -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Gregory Maxwell Sent: 15 February 2018 23:46 To:

Re: [time-nuts] GPS Jamming

I thank Adrian was being sarcastic :) -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Azelio Boriani Sent: 29 January 2018 10:00 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] GPS Jamming Wasn't the selective

Re: [time-nuts] Holdover, RTC for Pi as NTP GPS source

? RasPi-4? Not released until 2019 AFAIK ... I have RasPi-3 -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of David J Taylor via time-nuts Sent: 01 November 2017 16:08 To: time-nuts@febo.com Subject: Re: [time-nuts] Holdover, RTC for Pi as NTP GPS

Re: [time-nuts] Trimble Thunderbolt no longer determines the correct date

ver the years ….AFIK, there isn’t even a “public” firmware loader for the TBolt. Indeed, you might get lucky. Bob > On Jul 31, 2017, at 5:27 AM, David C. Partridge > <david.partri...@perdrix.co.uk> wrote: > > I emailed Trimble on the off chance they might have a firmware upgr

Re: [time-nuts] Trimble Thunderbolt no longer determines the correct date

I emailed Trimble on the off chance they might have a firmware upgrade. They sent me an email which covered some units that rolled over in Feb. 2016 for which they say they have no upgrade. I sent them all the information on the label stuck to the outside of my TB (one of the group buy set),

Re: [time-nuts] unknown GPSDO

ISTR that you started it with a short time constant to get locked, and once you had lock you would increase the time constant in a few steps to a final value of (say) 1000s or so. Dave -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Volker Esper

Re: [time-nuts] Toggle switch wiring for RFTGm-II (KS24019)

wiring for RFTGm-II (KS24019) Hi! On Wed, Jun 28, 2017 at 04:17:20PM +0100, David C. Partridge wrote: > The Lucent manual refers to a toggle switch in the frame to switch the > active module in the RFTGm-II (KS24019) from the Rb to the XO. Unfortunately I cannot answer your question. I hav

[time-nuts] Toggle switch wiring for RFTGm-II (KS24019)

The Lucent manual refers to a toggle switch in the frame to switch the active module in the RFTGm-II (KS24019) from the Rb to the XO. I have the complete shelf with both units and currently the Rb is the active module, and the XO is standby; but sadly there's no switch on the shelf itself. Does

Re: [time-nuts] Tracor 527A and 10MHz reference input

WB8TSL On Sun, Jun 25, 2017 at 2:25 PM, David C. Partridge < david.partri...@perdrix.co.uk> wrote: > Yes, does indeed look like it should be 4K7! > > -Original Message- > From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of David C. > Partridge >

Re: [time-nuts] Tracor 527A and 10MHz reference input

Yes, does indeed look like it should be 4K7! -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of David C. Partridge Sent: 25 June 2017 18:50 To: 'Discussion of precise time and frequency measurement' Subject: [time-nuts] Tracor 527A and 10MHz reference

[time-nuts] Tracor 527A and 10MHz reference input

A friend says his Tracor 527A works fine with a 10MHz Ref input even though it doesn't have the divide by 2 circuit from the addendum to the 527E manual applied. I'm puzzled by this - I can't quite see how the reference input circuit can produce a 5MHz output when fed with 10MHz (unless his

Re: [time-nuts] CRT for Tracor 527A

My message to Dan Rea are bouncing, so please forgive the BW: Dan, Hang fire please - I just got this baby hooked up and there's been some creative wire cutting done. The supplies for the CRT have been cut at the trafo. It needs lots of TLC as its not actually working right now - fun ahead.

Re: [time-nuts] KS24019 units PSU requirements

Thanks, I ordered a 24V 120W power brick from eBay. Dave -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Mark Sims Sent: 21 June 2017 16:19 To: time-nuts@febo.com Subject: [time-nuts] KS24019 units PSU requirements I have not measured mine, but I saw

Re: [time-nuts] GPS splitter

Hi Magnus - what sort of inductor value did you use? 68nH or so? Dave -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Magnus Danielson Sent: 17 June 2017 15:12 To: time-nuts@febo.com Cc: mag...@rubidium.se Subject: Re: [time-nuts] GPS splitter Hi,

[time-nuts] KS24019 units PSU requirements

I have a pair of L108 (RFTGm-II-Rb) and L109 (RFTGM-II-XO). What current do these bad boys draw so I don't get too skinny a 24V PSU? Thanks Dave ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

[time-nuts] CRT for Tracor 527A

Trying a long shot here, I'm looking for a 1" CRT type 1EP1 (or 1EP11, or?) for a Tracor 527A Frequency Difference Meter. I did spot some on eBay but the vendor had a rather high opinion of their worth :) at over 300 dollars Anyone got one to spare? Thanks Dave

Re: [time-nuts] SR620 TCXO calibration

at 15:35, David C. Partridge <david.partri...@perdrix.co.uk> wrote: > I think I'm being dense, but I can't work out how to get this thing to > display CalDat 04. I have managed to get it to display CalDat 0 value, > but > can't work out how to step through to view adjust CalDat

Re: [time-nuts] SR620 TCXO calibration

actually I think mine also has an OCXO D. -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Dr. David Kirkby (Kirkby Microwave Ltd) Sent: 19 June 2017 21:21 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] SR620 TCXO

[time-nuts] SR620 TCXO calibration

I think I'm being dense, but I can't work out how to get this thing to display CalDat 04. I have managed to get it to display CalDat 0 value, but can't work out how to step through to view adjust CalDat 04. Once I do get there, how do I manage to adjust the CalDat value while observing the

Re: [time-nuts] GPS splitter

FWIW the one I chose (V26-102LED is specified to 2.4GHz and has a real DC block on one port and DC pass on the other. They also do up to 8 way versions. At an overall cost of about USD3 or so!!! Dave -Original Message- From:

[time-nuts] GPS splitter

Anyone in UK have a spare GPS splitter? I've decided I need more clocks :) Dave ___ 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] Name of integral of timing residual

I think that should be "absity" (s not c) Dave -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Jim Palfreyman Sent: 20 April 2017 06:18 To: Discussion of precise time and frequency measurement Subject: [time-nuts] Name of integral of timing residual >

Re: [time-nuts] HP-59309A Clock counts only seconds

You can get a brand new CD4011BE from pretty much most suppliers at about 15 cents that won't exhibit the problems of the earlier ones. Dave -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Jeremy Nichols Sent: 04 April 2017 00:44 To:

Re: [time-nuts] GPS first LO need to be locked?

links [2] and [3] give 404 errors Dave -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Attila Kinali Sent: 31 March 2017 12:35 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] GPS first LO need to be locked? [2] "A

Re: [time-nuts] Time Dilation tinkering

Aiguille du Midi is 3842m IIRC (cable car base station at about 1000m). Dave -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of jimlux Sent: 22 March 2017 14:57 To: time-nuts@febo.com Subject: Re: [time-nuts] Time Dilation tinkering On 3/22/17 4:04 AM,

Re: [time-nuts] Line Voltage - USA

Time to call your supply co. Dave -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Dr. David Kirkby (Kirkby Microwave Ltd) Sent: 04 January 2017 13:42 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Line Voltage - USA

Re: [time-nuts] Line Voltage - USA

I think you meant : In 240V countries it was -10%/+6%. In 220V countries it was -6%/+10% Cheers Dave -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Poul-Henning Kamp Sent: 04 January 2017 09:34 To: Discussion of precise time and frequency

Re: [time-nuts] Anyone (ideally in the UK) got a spare rotary knob for the 5370B TI counter?

230VAC +10% -6%, so 253 is the upper limit. 248V is not unusual as for historic reasons some parts of UK still actually supply 250V ... When we "harmonized" our mains with the EU, we changed the specification from 240V +/- 5% (I think) and didn't actually change any equipment. Happy New Year

[time-nuts] Heather V5 Holdover

I just installed the new version of Heather, she's saying "Holdover: 51 secs" what's she trying to tell me please? Dave ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and

[time-nuts] Back to our main topic ...

While the recent discussion about PCBs has been interesting it would be better continued elsewhere I think (e.g. Homebrew_PCBs group on Yahoo!). Thanks Dave ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Question on LH

pm, David C. Partridge wrote: > But in any case at the end of the LH 48 hr survey, the survey location > will be stored into the currently connected TB. If both TBs are > connected to the same antenna, I think you'll need manually to set the > location of the second one (lat./lo

Re: [time-nuts] Question on LH

I'm confused here, LH can be connected to only one TB at any one time (depending on command line options). But in any case at the end of the LH 48 hr survey, the survey location will be stored into the currently connected TB. If both TBs are connected to the same antenna, I think you'll need

Re: [time-nuts] Need Time Help

Mark, Do you have a likely date for the availability of the new release (other than RSN)? Cheers Dave -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Mark Sims Sent: 04 October 2016 18:40 To: time-nuts@febo.com Subject: [time-nuts] Need Time Help

Re: [time-nuts] Thunderbolt spurs on 10MHz output at 100Hz and 200Hz from signal.

Yes, I fear a timepod is a bit out of my budget (I can dream tho'). Over here in the UK PN measurement kit is a bit thin on the ground too. So I looked at but that seemed a little thin on details. Or were you referring to something

Re: [time-nuts] Thunderbolt spurs on 10MHz output at 100Hz and 200Hz from signal.

Looks like all I've managed to do is measure the baseline noise of the analyser. Ho-hum looks like I need something a *lot* quieter to do these measurements. Dave -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of David C. Partridge Sent: 18 September

Re: [time-nuts] Thunderbolt spurs on 10MHz output at 100Hz and 200Hz from signal.

phase-noise still looks fairly high. How do you measure this? Cheers, Magnus On 09/18/2016 01:27 PM, David C. Partridge wrote: > Now that's interesting I just re-ran the measurement, and got a quite > different result which is attached. The spurs have GONE. > > My on

Re: [time-nuts] Thunderbolt spurs on 10MHz output at 100Hz and 200Hz from signal.

Yes, it's through a 20dB attenuator. I'll redo the measurement w/o the attenuator. Dave -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bruce Griffiths Sent: 18 September 2016 12:52 To: Discussion of precise time and frequency measurement Subject: Re:

Re: [time-nuts] Thunderbolt spurs on 10MHz output at 100Hz and 200Hz from signal.

Using John Miles PN.exe and Agilent E4406A -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Magnus Danielson Sent: 18 September 2016 12:47 To: time-nuts@febo.com Cc: mag...@rubidium.se Subject: Re: [time-nuts] Thunderbolt spurs on 10MHz output at 100Hz

Re: [time-nuts] Thunderbolt spurs on 10MHz output at 100Hz and 200Hz from signal.

12:26 PM, David C. Partridge wrote: > The local power is 50Hz, so I can understand the 100Hz spurs, but I > don't quite "get" where the 200Hz spurs are coming from. Or is that > just BAU harmonics? Consider full-wave rectification of 50 Hz, the power consumption load on t

Re: [time-nuts] Thunderbolt spurs on 10MHz output at 100Hz and 200Hz from signal.

ubidium.se Subject: Re: [time-nuts] Thunderbolt spurs on 10MHz output at 100Hz and 200Hz from signal. Hi, On 09/18/2016 12:26 PM, David C. Partridge wrote: > The local power is 50Hz, so I can understand the 100Hz spurs, but I > don't quite "get" where the 200Hz spurs are coming fro

[time-nuts] Thunderbolt spurs on 10MHz output at 100Hz and 200Hz from signal.

The local power is 50Hz, so I can understand the 100Hz spurs, but I don't quite "get" where the 200Hz spurs are coming from. Or is that just BAU harmonics? Thanks Dave ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] 1 PPS 50-ohm driver

Or put another way think 4 layer boards with power and ground planes. Dave -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of ed breya Sent: 17 April 2016 21:04 To: time-nuts@febo.com Subject: Re: [time-nuts] 1 PPS 50-ohm driver For high-drive outputs,

Re: [time-nuts] Ebay GPSDO for the price of shipping.

Hmm not to dissuade you from selling, but have you 'scoped the PPS on the RS-232/SMA outputs? My guess is you are seeing a very narrow pulse (uSecs) and need a pulse stretcher to actually do something like light a LED with it. Looks to be a nicely packaged unit. Dave -Original

Re: [time-nuts] Tait reference

Is it possible to tell by looking at the back of the unit to determine if an Rb is fitted? -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Stephen Tompsett Sent: 11 January 2016 14:13 To: Discussion of precise time and frequency measurement Subject:

Re: [time-nuts] ACAM GP22 Chip

FWIW I think the two books T versus AofE complement one another quite well Regards, David Partridge -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Attila Kinali Sent: 25 November 2015 10:25 To: Discussion of precise time and frequency measurement

Re: [time-nuts] Unified VCXO Carrier Board

All, I wish that people had said that the ADCMP600 was a mediocre comparator when I designed the board - I’d have used a better one! I can't find the post about the design and die level issues in a quick search (I've been off line for a few weeks). Bruce, I couldn't find your post about

[time-nuts] Serial Ballpoint issue again

I just installed Windows 10 (yes I know how rash), and now my Thunderbolt is being detected as a Microsoft Serial Ballpoint Mouse (yes, just like before inder Windows 7). I had set something up on Windows 7 in the boot.ini to stop this, but for the life on me I can't remember what it was. Please

Re: [time-nuts] Serial Ballpoint issue again

and frequency measurement Subject: Re: [time-nuts] Serial Ballpoint issue again David C. Partridge wrote: I just installed Windows 10 (yes I know how rash), and now my Thunderbolt is being detected as a Microsoft Serial Ballpoint Mouse (yes, just like before inder Windows 7). I had set something up

Re: [time-nuts] A few questions about Tboltmon

No, but Lady Heather will do that. Regards, David Partridge -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Chris Waldrup Sent: 06 August 2015 12:59 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] A few questions

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:

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] Using CPLD/FPGA or similar for frequency divider

Sent: 08 June 2015 15:09 To: time-nuts@febo.com Subject: Re: [time-nuts] Using CPLD/FPGA or similar for frequency divider On Sun, 07 Jun 2015 11:23:40 +0100, David C. Partridge wrote: My reading so far of what's been said in this thread is that you might get good results using a CPLD/FPGA

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,

[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] USB problems and solutions - Some what Off Topic

I originally replied offline, but given the level of discussion, it seems appropriate to put this here. Take a look at USBOblivion which will vape all existing registry entries etc. for USB devices. Next time you connect they will reload. The only problem is that COM port number will most

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] 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] 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 To:

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

Yes of course, you are correct! I'm not sure how to avoid the change in input impedance with the clipper involved unless I were to increase R1 to a very much higher value. I had intended to re-work the input clock shaper to reduce jitter if the proposed re-spin of the board had gone ahead,

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] 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

Symmetricon swallowed Navstar Systems Ltd. In 1993. So if there were any information available, they would likely have it, but I fear it may be long gone. I did find this reference in the time-nuts archive: http://www.navsync.com/docs/mushroom_data_sheet.pdf Which looks like the same animal

[time-nuts] Frequency Divider Board redux

I've been approached a few times in the recent past asking if I would do a re-spin of my frequency divider board. For details of this please see: http://www.perdrix.co.uk/FrequencyDivider/index.html It isn't viable to do this unless I can get orders for at least 40 and preferably more (the

Re: [time-nuts] MIT 2 inch cesium fountain, optically pumped

Yes, but that one's just a GPS watch (with a humongous price tag). Regards, David Partridge -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Jason Rabel Sent: 20 November 2014 15:58 To: time-nuts@febo.com Subject: Re: [time-nuts] MIT 2 inch cesium

Re: [time-nuts] future NTP programs...

it would not be OK to design a daemon which handles the crypto stuff or the control packets in a root-process, those should go in a sandbox. Absolutely agree, in my previous life in the data security arena (crypto, data security, white hat tester etc..), doing that sort of thing in a

Re: [time-nuts] Anybody have experience with TimeMachines TM1000AGPS Time Server

If you’re referring to this: I think he's referring to section 4.3 Resetting to Factory Defaults 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] Anybody have experience with TimeMachines TM1000AGPS Time Server

You also have to reboot after a PW change ... 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 and follow the instructions there.

Re: [time-nuts] Tektronix TM500 extender cable kit

No, you also need a GPIB extender cable for FULL function ... Regards, David Partridge -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of R.Phillips Sent: 04 August 2014 17:11 To: Discussion of precise time and frequency measurement

Re: [time-nuts] Tektronix TM500 extender cable kit

Hi Mark, After all the effort you just put in, you'll be a touch annoyed that Jamma Boards have done a kit for TM500 extenders for ages ... OTOH you may know about them and have decided you could do better. http://www.jammaboards.com/store/tektronix-tm500-series-extender-kit-tm500- kit.html

Re: [time-nuts] Sine to square wave converter Phase Noise

Bruce, Thank you, that was very useful information. If I ever do a re-spin of the divider I will likely use the LTC6957-3 or -4 instead of the ADCMP600 (I would need interest for at least 40 boards to be able to do this at anything like an economic price). Will you be putting the full

Re: [time-nuts] Sine to square wave converter Phase Noise

Further to my previous post: I note that the LTC6957 is 3.3V CMOS rather than 5V. Do you have a recommmendation for a level converter to 5V logic? Would a 74AC04 using a 5V supply cope well enough in that role or is there a better solution? Regards, David Partridge -Original Message-

Re: [time-nuts] OT Gel Cell question

Back to time related discussions please. Thanks Dave ___ 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] GPS puck?

Slightly OT, but not much, does anyone in the UK (or close) have a GPS puck (mouse, sensor etc.) with serial NMEA output available cheaply? Ideally with RJ11 (6P4C) connector, but I can solder ... Thanks Dave ___ time-nuts mailing list --

Re: [time-nuts] GPS puck?

Mark, Thank you that looks ideal, now all I need is a suitable weatherproof cover and I'm in business. Regards, David Partridge -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Mark Sims Sent: 26 June 2014 18:17 To:

Re: [time-nuts] Measuring the accurcy of a wrist watch

I too tried that and equally failed even with 52dB gain. I suspect that part of the trick is how the piezo is mounted: Quite possibly if mounted in a circular form held only at the edges, with the watch crown touching the centre it might be more sensitive than if the centre is clamped to the

[time-nuts] Serial port splitter s/w

I'm running Meinberg NTP on the Windows 7 x64 machine to which my Thunderbolt is attached. I'd like to be able to share the serial port between LH and NTP so that I can run the machine as an NTP Stratum 1 server locked to the TB, and also be able to use LH to check things. I looked around the

Re: [time-nuts] Serial port splitter s/w

You guys have me persuaded - I'll get a Raspberry Pi ... Regards, David Partridge -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of David J Taylor Sent: 26 February 2014 19:15 To: Discussion of precise time and frequency measurement

[time-nuts] Lecture at Warwick University tomorrow

Time nuts in the UK will be interested in the Institute of Physics lecture at Warwick University tomorrow by Helen Margolis from NPL. Title Keeping time with a single atom. http://www2.warwick.ac.uk/fac/sci/physics/news/iop/ Regards, David Partridge

Re: [time-nuts] 5370 processor boards available

Kudos! I applaud your effort, wish I had a 5370. Regards, David Partridge -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of John Seamons Sent: 24 February 2014 03:57 To: Discussion of precise time and frequency measurement Subject:

Re: [time-nuts] strange behavior of 53230A or is the light on, but nobody in?

Did you disconnect the external reference from the 53230A before doing the test? If no, I'll bet that the external reference being connected overrides the internal reference Regards, David Partridge ___ time-nuts mailing list -- time-nuts@febo.com

Re: [time-nuts] Z3816A Control and Cleaning

Is Calgonite just a brand name for regular dish-washer powder? (Not being a US denizen, the name passes me by). Thx Dave -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Howard Davidson Sent: 24 January 2014 08:12 To: Discussion of

Re: [time-nuts] fast edge, rise time.

Look at the Jim Williams application note http://cds.linear.com/docs/en/application-note/an47fa.pdf Regards, David Partridge -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of ct1dmk Sent: 26 December 2013 16:08 To: Discussion of precise

Re: [time-nuts] DTS-2077 Very Cool Toy!

Wow, where do I get one and how spendy are they? Cheers David Partridge -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Ed Palmer Sent: 10 September 2013 05:34 To: Discussion of precise time and frequency measurement Subject:

Re: [time-nuts] Spectracom 8170 Time of Day grief...

I thought the Junghans Mega clock used DCF-77 rather than WWVB? Regards, David Partridge -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of ewkeh...@aol.com Sent: 13 June 2013 22:27 To: time-nuts@febo.com Subject: Re: [time-nuts]

Re: [time-nuts] Dave Partridge Version 2 Full Board available

While on this subject, if anyone should want me to, I am quite happy to put the Gerbers for the PCB on my website. Regards, David Partridge -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of James Robbins Sent: 05 June 2013 13:06 To:

Re: [time-nuts] Found at a surplus store

Hi Pete How many did you buy? Where did you find 'em? Dave -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Pete Lancashire Sent: 05 March 2013 04:53 To: Discussion of precise time and frequency measurement Subject: [time-nuts]

[time-nuts] Thunderbolt firmware to E-level ?

Something I saw in John Miles recent post on the TB thread leads me to ask if a regular TB can be upgraded to TB-E level firmaware, and if so is sensible to do so? Thanks Dave ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Low noise power supplies?

PTAT == Proportional To Absolute Temperature Dave ___ 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] Racal MA-259 Crystal frequency standard on UK eBay

http://cgi.ebay.co.uk/230912316345 Dave ___ 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.

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