Re: [time-nuts] Serial to Excel utility.

Hi Nic I havent done it but a friend did for a magnetomter unit..it ought to be possible to write a simple macro in Excel to take comma delimited input data from the serial port. It is always simple when you havent done it though :-)) I have trapped GPS NMEA input to file in Hypertext and

Re: [time-nuts] FE 5680A new version - Filtering the 10 MHz

I may be mistaken but that does not look like harmonic distortion to me. the frequency imposed on the 10MHz sine-wave is around 140MHz, this sounds like the VCO frequency in the Rb loop. The corner frequency of the filter could be a long way away from 10MHz in that case with maybe minimal

Re: [time-nuts] Racal-Dana 1992 Startup -- GPIB!

Hi Robert these were used in the old 9025 and 9026 nixie counters as well. You can often pick these up for les than the value of the OCXOblast there I have given my secret away :-)) My own experience is that these are very good after they have been operated by someone else, say the military,

Re: [time-nuts] The GPS velocity of light versus neutrinos

It an awful long time since I did nuclear physicsback then the neutrino was massless and the standard model didn't exist. There were some way-out models being proposed.smokey globe!! A couple of things occur to methey dont actually measure the time outgoing of the neutrinos...they

Re: [time-nuts] Line Volytage frequency Interface

I wouldnt even rely on that. a coroner in the US recently proclaimed that the cause of death was spontaeous human combustion (again) despite all the TV programs debunking that old wives tale. Alan G3NYK - Original Message - From: Poul-Henning Kamp p...@phk.freebsd.dk To: Discussion

Re: [time-nuts] Help with HAMEG HM8123

Get a manual from the Hameg site http://www.hameg.com/manuals.0.html?no_cache=1L=1%3E You may find that the English versions do no always contain the circuit diagrams .in this case download the German language version which will have the circuits at the back Alan G3NYK - Original Message

Re: [time-nuts] Help with HAMEG HM8123

Hi Danial I admit I have only downloaded scope manuals but for many of those the schematics are only at the end of the German language version. They are usually quite helpful so it might be worth contacting them. Alan G3NYK - Original Message - From: Daniel Mendes dmend...@gmail.com To:

Re: [time-nuts] Why these Crystal Frequencies?

and the one right at the bottom 1.4204058 GHz is the atomic hydrogen rest frequency to those of us with a vague interest in Radio astronomy :-)) Alan G3NYK - Original Message - From: Brooke Clarke bro...@pacific.net To: Discussion of precise time and frequency measurement

Re: [time-nuts] Fwd: LORAN RECEIVER

There is nothing in Ireland Azelio, that station is in England just south of the Scottish border at Anthorn Alan G3NYK - Original Message - From: Azelio Boriani azelio.bori...@screen.it To: shali...@gmail.com; Discussion of precise time and frequency measurement time-nuts@febo.com Sent:

Re: [time-nuts] HBG keeps transmitting...

Probably when the hung over teckies get back in to work in a state they can find the off switch :-)) Alan G3NYK - Original Message - From: Azelio Boriani azelio.bori...@screen.it To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sunday, January 01, 2012

Re: [time-nuts] HBG keeps transmitting...

What do Swiss parking meters use then ?? Alan G3NYK - Original Message - From: Attila Kinali att...@kinali.ch To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sunday, January 01, 2012 3:11 PM Subject: Re: [time-nuts] HBG keeps transmitting... On Sun,

Re: [time-nuts] Racal-Dana 1991 w. Option 4C - what is that ?

Hi Tom I seem to remember seeing a 5MHz standard in a triple oven at PO Research in London were I worked in 1961. The crystal was made there and was a 5MHz 3rd overtone and either a plano-convex or double-convex shape, I believe. They had a lens grinding machine for generating the blanks. This was

Re: [time-nuts] New Rubidium Frequency Standard Group

I dont want to have to take loads of groups to keep up with the expertise available on this Group. The answer to bandwidth in my case is the DELETE key, and it would be less if there was not the continued use of quoted-quoted quotes :-)) Even if you quote one its worth knocking the tail off

Re: [time-nuts] A little quick advice, please

Sampling scopes will display repetative signals above the sampling frequency if the repetition rate of the signals and sampling rate are not relatedthere were GHz bandwidth scopes in the 60s using this method. Not a lot of good on single shot though. PC scopes are quite good for repetative

Re: [time-nuts] Setting clocks 100 years ago

Hi Antonio 170 years ago in the UK the time was beginning to be distributed by telegraph. In the UK the railways were the driving force for this and a universal (countrywide) time. Prior to that all the towns in the UK had a local time I dont know where it came from but could be a sundial at

Re: [time-nuts] Setting clocks 100 years ago

Good question, probably to allow the Astronomer Royal's staff to take a transit and check their clocks for that day. Alan - Original Message - From: WB6BNQ wb6...@cox.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Friday, November 05, 2010 12:11 AM

Re: [time-nuts] Gamma-ray and jitter

I am dubious of this but cant find a reference at the moment. Very little of the massive doses of hard X-rays from the Sun actually reach the earths surface. Most interact with the atmosphere to produce the ionisation layers. Gamma have the same effect. If substantial Gammas were reaching the

Re: [time-nuts] 5 and 10 MHz crystal filters

Hi John I have a collection of filters but I have not seen any common ones at those frequencies with 50 ohm termination. The characteristic would probably require transformer input and output coupling, the inherent impedance of most filers in this frequency range will be around 1kohm. The narrower

Re: [time-nuts] temperature stability basics

I believe there is a reflective/foam insulator that is sold for setting behind (what we in UK call ) CH radiators when the are mounted on outer walls. That would meed Poul-Henning's temperature difference criteria, I think. Interesting topic may me revise some 50 year old very rusty physics :-))

Re: [time-nuts] If there a FAQ

Oh Dear Hal how the old skills are lost when everything comes with digits on it :-)) You put the BFO on and you do a 3 signal beat, which can be set to 0.1 Hz quite easily by listening to the swell. This is 1 in 10^8 at 10MHz !! Ah I am showing my age again :-)) Alan G3NYK - Original Message

Re: [time-nuts] Loran?

Hi Rob no we invented RDF (or Radio Location)and they called it Radar :-)) Alan G3NYK - Original Message - From: Rob Kimberley r...@timing-consultants.com To: 'Discussion of precise time and frequency measurement' time-nuts@febo.com Sent: Monday, December 20, 2010 9:51 PM Subject: Re:

Re: [time-nuts] LORAN C is good again tonight 90070

Hi Stan Loop Head was not commissioned but the gear and the slot is being used by as a slave eLoron station on the Lessay chain, from Anthorn on the south bank of the Solway Forth in NW England. Alan G3NYK - Original Message - From: Stan, W1LE stanw...@verizon.net To: Discussion of

Re: [time-nuts] LORAN C is good again tonight 90070

Oh yes there is !! Alan G3NYK - Original Message - From: paul swed paulsw...@gmail.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Wednesday, December 22, 2010 3:58 PM Subject: Re: [time-nuts] LORAN C is good again tonight 90070 Interesting all of

Re: [time-nuts] Simple 5 to10MHz frequency doubler

Hi I have just broken up an old 10-Base-T 16 ay switch and recovered 16 DIL filter/isolating transformers ( identified as a 10F434 from YCL) and the spec an pin-out was still available on the YCL web site.worth a look for 10MHz distribution?? I am concerned that a narrow 10MHz filter

Re: [time-nuts] Completely OT: Removing electrolytics of leakingcapacitors from a pcb

Hi Ulrich, yes its nasty. As far as I am aware the liquid electrolyte is an alakali, sodium or potasium hydroxide. This retains the insulator (aluminium oxide) on the plates by electrolytic action. When spewed on to the PCB it is conducting and starts and electrolytic reaction that will eat away

Re: [time-nuts] Clock Calibration

Hi This is an interesting concept of measuring or comparing without electronics. Dont forget the scientists of former eras has some quite inovative bits of kit. the CRT dated from the 1920 but Victorians used a sooted glass slide carried on a small trolley that was moved by a falling

Re: [time-nuts] Austron 1150

No Problem Bert its nothing to what my friends call be sometimes :-)) Glad you got the data. This is a great group for help! Alan - Original Message - From: ewkeh...@aol.com To: time-nuts@febo.com Sent: Tuesday, February 01, 2011 9:34 PM Subject: Re: [time-nuts] Austron 1150 Sorry

Re: [time-nuts] OT- RMC sentence and magnetic variation/compensation in GPS module

Try this site as an alternative for local magnetic data http://www.ngdc.noaa.gov/geomagmodels/IGRFWMM.jsp?defaultModel=WMM Alan G3NYK - Original Message - From: Chris Albertson albertson.ch...@gmail.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent:

Re: [time-nuts] Why do crystals go bad?

Hi Bill I have never worked on quartz crystals, but I was attached to a group that had made many of them for the British Post Office in the 1950s. I also used, and replaced, a lot in commercial 2-way radios in the 1980s and 90s. First are you really sure the crystal has changed it is more likely

Re: [time-nuts] advice: frequency calibration to 1 ppm possible without GPSDO?

Mmmm well you have another uncalibrated and not very good crystal there in the sound card, but that is not the problem.You also have some receiver drift (Sony) I suspect at 5MHz. I would be surprised if WWV went as much as 1Hz off over a night let alone 10Hz.. Divide the 10Mhz by 2 and leak it

[time-nuts] Fw: your 'quake

Hi All I though you might like to hear our member Steve Rooke is a survivor in Christchurch. This just received from him. Alan G3NYK - Original Message - From: Steve Rooke sar10...@gmail.com To: Alan Melia alan.me...@btinternet.com Sent: Thursday, February 24, 2011 6:55 AM Subject: Re

Re: [time-nuts] OT Systron-Donner Basic

Hi Ignacio try the print like format with ##.## to define decimal places etc Alan G3NYK - Original Message - From: EB4APL eb4...@cembreros.jazztel.es To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sunday, March 20, 2011 4:41 PM Subject: [time-nuts]

Re: [time-nuts] OT Systron-Donner Basic

to all my efforts after diving in old Basic, Fortran, Algol, etc. manuals but never found a STYLE statement.I always get ILLEGAL STYLE error and no other cues. Thank you anyway, I appreciate all efforts. Ignacio EB4APL El 20/03/2011 18:12, Alan Melia wrote: Hi Ignacio try the print like format

Re: [time-nuts] Transmission line question

Am I missing something?? Surely it depends on whether the lines are terminated otherwise by the time time a pulse has travelled to the end and back they will be a complex impedance and will be frequency dependent 2 open stubs ?? If terminated then 25 ohms, but why does it matter what a high

Re: [time-nuts] Transmission line question

Hi Don excuse me I was thinking RF :-)) That should be OK Though it depends what you are trying to do bus termination is usually slightly different to RF. At least you should not get nasty reflections from the ends like that. There may come a problem if you send a pulse from a 100 termination

Re: [time-nuts] BNC question

Hi Stan this one has been covered before the pins are the same size the difference is in the amount of dielectric round the socket in the femalethe 75 ohm one hase the socket poking free of the ptfe and on the 50 ohm it is flush with the end. The the centre connectors mate correctly together.

Re: [time-nuts] Selecting a used HP sweep/frequency generator

I have found on several occasions that you can read an failing EPROM in a prommer, that will not operate in its application. Sometimes it is possible to read. erase and reburn the same Eprom and get a working system again, but it is always worth keeping an image. Alan G3NYK - Original

Re: [time-nuts] UK: Notice of Interruption to MSF 60 kHz Timeand Frequency Signal

Hi Rob, it was mentioned to me by someone that if it was aerial mantenance, then they had to shut the whole site down not just the transmitter feeding the mast they were working on. I think they are duplicated on electronic hardware. Alan G3NYK - Original Message - From: Rob Kimberley

Re: [time-nuts] UK: Notice of Interruption to MSF 60 kHz Timeand Frequency Signal

to MSF 60 kHz Timeand Frequency Signal On 04/29/2011 04:42 PM, Alan Melia wrote: Hi Rob, it was mentioned to me by someone that if it was aerial mantenance, then they had to shut the whole site down not just the transmitter feeding the mast they were working on. I think they are duplicated

Re: [time-nuts] Softpal VLF software?

Wolf makes this a working program and there is the facility to lock to GPS or a local VLF station I believe. He is very approachable and ready to help. The program is very complex due to all the odd facilities that have been included over the years. For those that want to VLF phase measurement

Re: [time-nuts] please un subscribe Pete to Time Nuts

Nancy, Pete was a regular and knowledgable contributor to our group and he will be sadly missed by all. Please accept my condolences on your loss. I am sure John will be able to close his account for you Alan Melia Ipswich, UK - Original Message - From: Pete Rawson peteraw

Re: [time-nuts] Advice on NTP server needed

This is raising an interesting point, only vaguely relevant, but we have been testing some software for amateur radio astronomy purposes that controls intruments over serial lines RS-232 or RS-485. Whilst many application run with out problems for days on internal serial cards, we seem unable to

Re: [time-nuts] usb serial converter (was: Advice on NTP server needed)

- Original Message - From: Attila Kinali att...@kinali.ch To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Monday, June 13, 2011 11:36 PM Subject: [time-nuts] usb serial converter (was: Advice on NTP server needed) On Mon, 13 Jun 2011 23:25:54 +0100 Alan Melia

Re: [time-nuts] Replacing electrolytics - any disadvantages of high temp ones?

David Another important factor when considering power supply caps is ripple current rating. It is generally the ripple current that makes them get warm. I think the usual thumbnail calculation still work for caps if you can reduce the temperature by 20 degrees they will last at least 4 times as

Re: [time-nuts] Replacing electrolytics - any disadvantages of high temp ones?

Hi Brooke that is only the last of about 5 or 6 articles in the same journal you need to find the others as well. Cyril used to work for one of the big UK manufacturers I believe. I think I still have the paper copies of EWW somewhere. Alan G3NYK - Original Message - From: Brooke Clarke

Re: [time-nuts] transformers.

Ah but transformer design will become a lost art and will spawn lots of little garage industies :-)) I have certainly had some Heath transformers overheat and go shorted-turn primary when used on 50Hz in the UK, and also some Japanese ones...they have 50Hz and 60Hz I believe unless they have

Re: [time-nuts] Transformers

At the risk of incurring John's wrath ..:-)) The trouble with the so-called green switch-mode transformers is they pollute !! .the radio spectrum!! We still have LF BC services in Europe and an LF amateur band.The noise floor has risen by nearly 20dB in the past 10 years, due to

Re: [time-nuts] Austron Model 2000C

Jamie I have an electronic copy but it is too big (90Mb) to send or upload. If you dont get any other takers I can post you a CD.I am in the UK. It probably means there is one skulking around somewhere in the States. Best Wishes Alan G3NYK - Original Message - From: James R. Gorr

Re: [time-nuts] common mode loran comparisons

Brooke I wonder if you have seen this page from a European friend of mine. Markus Vester DF6NM http://freenet-homepage.de/df6nm/LoranView/LoranView_Mar2006.htm Alan Melia (UK) G3NYK - Original Message - From: Brooke Clarke [EMAIL PROTECTED] To: Discussion of precise time and frequency

[time-nuts] Frequency Difference meter 100-7

Seeing Stan's query about the Tracorreminded me I have what I think is a slightly older unit made by Montronics. I have been totally unable to find any information or manuals on this unit. It is presumably similar to the Traco, Fluke and Keithley equipment of later years. I would very much

Re: [time-nuts] Austron 1120 ...thanks

); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Hi Peter thanks for that I have had an 1120-2 1MHz unit sulking in my might be useful sometime box for a couple of years. Cheers de Alan G3NYK (Ipswich) - Original Message - From: Peter Vince [EMAIL PROTECTED] To: [EMAIL

Re: [time-nuts] Active LF Antennas

Hi John, I think Lyle Kohler K0LER (?) has a version with the J310 on his site. I have seen cases were J310s were placed in paralled to get better IMD performance and maybe lower noise but that is not a problem at LF. They do work well but like all voltage probe antennas need mounting high for

Re: [time-nuts] Estate Sale find

); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Hi Warner there have been queries asking for Rycoms on the LWCA message board and reflector I will risk your wrath and forward a posting there for you Regards Alan G3NYK - Original Message - From: M. Warner Losh

Re: [time-nuts] Scopes and 1 PPS signals?

); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY I presume it has a calibrated delayed TB how about using that ?? Alan G3NYK - Original Message - From: Brooke Clarke [EMAIL PROTECTED] To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent:

Re: [time-nuts] Scopes and 1 PPS signals?

faster than the main trace which would be 20 ms/sq, way too slow to see the pulse. Have Fun, Brooke Clarke http://www.PRC68.com http://www.precisionclock.com http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Cam Alan Melia wrote: ); SAEximRunCond expanded to false Errors

Re: [time-nuts] Parallel voltage regulators

); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Hi Tom I dont think you need the resistors these are current limited and the sense is inside the chip so the resistors dont do anything (you are thinking of a negative feedback effect). All that happens in paralled operation is

Re: [time-nuts] Loran antenna

); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Hi Didier, you will find a lot of information on small LF antennas on the Long Wave Club of America site www.lwca.org look in particular for an active voltage probe antenna by Roeloff Bekker PA0RDT. This is proving quite

[time-nuts] Montronics 100-7 manual/spec ??

); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Hi All, I know this unit is aging a bit and there are probably better ways of comparing standards in 2007 but I have this Frequency Comparator Model 100-7 by Montronic Inc sitting in my rack. In essence it is similar to the

Re: [time-nuts] Super stable BVA Quartz resonators... BVA??

Berndt I believe you are describing a Triax connector I found them through Trompeter but I believe they are sold by Farnell and RS Components in the UK. The same connector was used I think on some of the HP system digital voltmeters. Cheers de Alan G3NYK - Original Message - From: Bernd

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

Hi John, Andy Talbot G4JNT developed the a Jupiter based GPSDO for just this purpose, several are used by hill-toppers in the UK. http://www.scrbg.org/g4jnt/freqlock.htm The idea was that it would settle and be accurate in the time it took to seet up the microwave part of the station. I hope that

Re: [time-nuts] device as sniffer/ promiscuous mode GPIB devices?

There is also a battery handheld unit by Racal Dana which will trigger and display captured bus transactions. Also the function is on some logic analysers. I have low end BlackStar LA that has an IEEE-488 personality cardall acquired cheaply on that auction site Alan G3NYK - Original

Re: [time-nuts] Tracor 895A

Hi Nic these are difficult to find for free but Ridge Electronics have one for Tracor 895 at $20. I just got a Montronics Freq Diff meter manual from them. Alan G3NYK - Original Message - From: Nic McLean [EMAIL PROTECTED] To: 'Discussion of precise time and frequency measurement'

Re: [time-nuts] Clock Powers of Ten

Hi, I dont know about other counties but the oad shedding is certainly still dont this way in the UK, BUT the incremental frequency adjectments are corrected for the mean daily frequency to be correvt at 06:00 in the morning so that all the clocks read correctly and we get to work on time!!

Re: [time-nuts] GPS-Attached Equipment Lightning Protection

Hi All, all the comment has been about in-line protectors so far. We in the UK do dot have the ferocity of lightning that is seen in some parts of the USA but surely like all problems prevention is better. It is probably not 100% but would it not be better to have a higher metal rod say 6 feet

Re: [time-nuts] Frequency reference

It does not matter how many references you build you will never know how good they are. There can only one judgement goodness, and this is comparison with the national standard. You reference may even be better that a national standard but must be judged against the national standard. Most

Re: [time-nuts] LED reliability and sub cables

Mm LED operation is basically a bulk effect whereas the reliability of transistors depends more on surface effects. In 1960 ATT chose to go with Germanium, but the British Post Office chose the new silicon planar technology for future submerged cables. Previously Dr Gilbert Metson had written

Re: [time-nuts] sub cables

Hi Didier yes trawlermen's axes are a worse problem than anchors !! I have seen a pic of the remenants of an axe head with a large chunk taken out of it. The fisherman survived but was a bit shaken ! Of course the cut was made near the end on the continental shelf so the volts were quite high!!

Re: [time-nuts] sub cables...and GBR

- Original Message - From: Neon John [EMAIL PROTECTED] To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Thursday, May 01, 2008 9:46 PM Subject: Re: [time-nuts] sub cables On Thu, 1 May 2008 11:13:48 +0100, Alan Melia [EMAIL PROTECTED] wrote: At least

Re: [time-nuts] Low frequency crystal

Hi Robert in the days before TTL dividers there were quite a few vert low frequency cuts. I think that one is a flexural bar designated NT cut. I have also seen crystals of lower than that made in the gapped ring format which oscillate a little like a tuning fork. ( I think I have seen one of

Re: [time-nuts] Administrivia -- febo.com outage

Thanks for your efforts John it shows how interesting it is as there were queries very soon after that !! Best Wishes Alan G3NYK - Original Message - From: John Ackermann N8UR [EMAIL PROTECTED] To: Discussion of precise time and frequency measurement time-nuts@febo.com; [EMAIL PROTECTED]

Re: [time-nuts] Phil's Fluke Monotronics equipment

Bill, I bought an original manual from Ridge last year for a Montronics Model 100 Frequency Difference meter, at very reasonable cost despite post to the UK from Ridge Equipment, and I have just found, and bought, a copy of the Fluke 100-7 which I am presuming was a bought in design from

Re: [time-nuts] 1968 Scientific American Magazine: Cesium ClockStandards

Hi Dave, as a long time reader (since 1955) and subscriber I remember the Amateur scientist pages ending in the 1980s. I think the contributer retired. At around that time I think the many adherents formed the Society of Amateur Scientists. Though I have not visited fot several years the web

Re: [time-nuts] Frequency distribution isolation transformers YCL20F001n arrived

Hi Paul I confirm the 17MHz LPF response I didn't measure them for flatness :-)) The source I used was surplus 16way 10BaseT switches which were junked some time back but may still be lying in the back of store-room cupboards.you get a lot on one board that way. Alan G3NYK - Original

Re: [time-nuts] Austron 1250A

Hi Ole Mmmm well I have 2 and a friend has one all had dead batteries, quickly removed, but we didnt have a manual then so we just ran them without them batts. Our power is quite reliable. My pair have been running continuously for around 7 years now with no signs of problem and no relay

Re: [time-nuts] 510 doubler and old Toko RF catalogue (Cirkit 2nd ed.1994)

Hi Andrea I have here a Cirkit 2nd edition Toko catalogue dated 1993 (a firm local to me I dealt with quite a lot) The cat is in good condition but it is 128 pages and a glued spine so scanning risks breaking it up. However the 10k range occupies just one page and if the part adjacent to the

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 not

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

Hi Tom dividing down wasn't always necessary I have sample from the UK GPO Crystal Factory of NT-cut bars, quartz tuning fork, and Gapped Ring crystals, the latter marked 400cps (pre Hertz :-)) ) I think these are post WWII because they are mounted in IO base GT style tube envelopes.

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

It just depends what you mean by that :-) I could lock to Lessay and Anthorn at frequencies in the 136kHz amateur band, using some S/N DSP software writen by Peter Matinez G3PLX. Alan G3NYK - Original Message - From: Poul-Henning Kamp p...@phk.freebsd.dk To: Discussion of precise time

Re: [time-nuts] Would this work as a frequency standard? Would it damage the Stanford Research function generator?

Hi David I live a little to the North of you and I have used R4 a number of years ago...In fact I spotted and reported to NPL breathing or hunting on the output compared to my two Austron 1250As the period was about 100secs. I was emailled a couple of months later to say the exciter had

Re: [time-nuts] How did they distribute time in the old days?

Well I dont know if it was used for that but the16kHz VLF station at Rugby call-sign GBR was rebuilt in 1967 and the output tank circuit stiffened to provide better phase stability specifically foe international time standard comparison. The transmitter was used for initial comparisons between

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

Dave check with the Triniity House web site they are the sponsors of the Anthorn slave site, the master station is at Lessay on the St. Malo penninsular so should be strong. There is (or was) a full descrition of the option to GPSon the website. I believe there should be at least 5 years to

Re: [time-nuts] Loran Europe Lessay seems to be back on air?

a> To: <time-nuts@febo.com> Sent: Wednesday, January 06, 2016 9:44 PM Subject: Re: [time-nuts] Loran Europe Lessay seems to be back on air? On 2016-01-04 14:11, Alan Melia wrote: I remember being told by a senior member of the RIN that he thought it was a "dead duck" and a wast

Re: [time-nuts] Loran Europe Lessay seems to be back on air?

If I remember correctly the GLA(Trinity Ho.) has a contact with Babcock who run Anthorn which goes through to 2019 or 2020. The notice to mariners did not mention Anthorn but it did request that nav. receivers be turned off. If TH terminate that contact they will presumably have to pay Babcock

Re: [time-nuts] KD2BD WWVB receiver/decoder in QEX

Hi Bob I have just realised that MSF may work diffently?? The Anthorn signal is monitored by NPL at Teddington, West of London and frequency off-sets twice a day are published in parts in 10^12 on their web-site.involving lot of averaging I think. They do not recommend using the signal

Re: [time-nuts] KD2BD WWVB receiver/decoder in QEX

ccording to NIST: http://www.nist.gov/pml/div688/grp40/wwvb.cfm -- Bill Byrom N5BB On Sun, Nov 22, 2015, at 04:16 PM, Alan Melia wrote: Hi Bob I have just realised that MSF may work diffently?? The Anthorn signal is monitored by NPL at Teddington, West of London and frequency off-sets twice a day

Re: [time-nuts] Measuring receiver...

TX "fingerprinting" in WWII You seem to be forgetting that there were very few of the sophisticated digital timing systems were available 75 years ago. Traffic analysis was started early in 1938 or even before. By 1939 we knew all the nets used in Europe and had "Y" ( a corruption of WI,

Re: [time-nuts] Tait reference

Its difficult to say unless you can contact an ex Tait dealer who maintained a Local authority or Utility scheme. A similar unit by Pye/Philips I have knowledge of, was the HS400. This contained a Toyocom 5MHz OCXO which was used to lock a crystal producing the required excitation for the

Re: [time-nuts] Generating a solid PPS from 10Mhz source

Indeed Bob in the 70s I built a failure diagnostic equipment to record the Idd of a chip as a function of a position of a spot of light scanning the surface. The intensity was very low and not optimum wavelength...it was a scope raster demagnified by using a microscope camera accessory

Re: [time-nuts] Glass Envelope Quartz Crystals

I think it was unlikely that that it was made "just to see where it would come out" That is a flexural bar possibly an NT cut. 100KHz standards were commonly made in this format. The British GPO had a factory at Mill Hill in N. London making these in tube-like (valve in UK) enclosures, IO GT and

Re: [time-nuts] Fast risetime pulse generator

Bill, Avalanche pulse gens only require high voltage because of the high VBRcbo and the gain of normal NPN transistors. I cant find the reference now it might have been a 1970s Ham Radio but if you use the same circuit as Jim but put an NPN "upside down" that is emitter where the collector is

Re: [time-nuts] Reliability of atomic clocks

Hi Attila, I am out of the business now, well retired, so my opinion carries little weight, :-)) but for whatever it does, my thought is that MTBF is a pretty useless parameter in general. This is a relatively low volume unit manufactured by a variety of different firms with each their opinion

Re: [time-nuts] MSF 60KHz Problems?

Hi Nigel its been running about 17msecs fast for that last couple of months but it seemed to be corrected last week, maybe the exciter failed completely :-)) Gotta be all this snow you have been getting !! Best Wishes Alan G3NYK - Original Message - From: "GandalfG8--- via

Re: [time-nuts] OXCO Spurious Output at Line Frequencies

Bob the VLF guys in Europe can receive the 60Hz signal over here! so you probably needed a test site on the far side of the Moon :-)) Alan G3NYK - Original Message - From: "Bob Camp" To: "Discussion of precise time and frequency measurement" Sent:

Re: [time-nuts] Visiting Greenwich

Hi Clint I think when I discussed this last a few years ago with the speaking clock designer and David Rooney the man responsible for the time gallery at Greenwich. The clock is an early quartz unit, probably made at the then Post Office Reseach Labs at Dollis Hill in NW London. The clock is

Re: [time-nuts] Vintage Frequency Measurement

I am surprised no-one mention the 3-beat method, which was fairly common for Hams with comms receivers. You put the BFO on and adjusted so the main slow beat modulated the level of the output tone. You can judge zero beat to much better than 0.1Hz that way probably near as low as 0.01Hz. (1E-9

Re: [time-nuts] Vintage Frequency Measurement

Hi Dan yes that is 5e-6 about all an unstabilised (temp) AT could hold for any period. I guess there were no WWV or MSF signals around then. When a good source was available off-air it was possible to do better than that. In service it was probably "dont waste time trying to better the minimum

Re: [time-nuts] Vintage Quartz Crystal Manufacturing

Hi Adrian (in the UK I think) I think you will find the designation WS.7 is a UK Military type number. Try and search vintage military radio. Lovely beasties, I have not seen that configuration and they are probably quite early in the use of quartz in sets on a manufacturing scale BestWishes

Re: [time-nuts] Vintage Quartz Crystal Manufacturing

Hi agn Adrian .quote from Wireless for the Warrior "Wireless Set No. 7 was a mobile transmitter/receiver developed in 1935. Use: communication between tanks. Frequency range 1.875-5MHz. MO/crystal control. RF output 5W. R/T and MCW. Range 3-5 miles. Unusual shape to fit in the bulge of a

Re: [time-nuts] Rohde & Schwarz XSD 2.5 MHz crystal gone bad?

Michael a couple of wild thoughts, make sure there is no 500kHz there (this is the crystal fundamental and the maintaining circuit should be degenerative there. (Is it a Meecham Bridge?) That sounds like a baseless IO GT valve (tube in US ) enclosure which was probably originally

Re: [time-nuts] For those that insist on using switching power supplies

.but can you listen to the radio in the car ?? Many of these things will kill other applications like broadband over twisted pair and PLT tv extension. Never mind killing you! Alan G3NYK - Original Message - From: "Van Horn, David" To:

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