Re: [time-nuts] accurate 60 hz reference chips/ckts

I dont think working that way would give a stable clock in the UK. Our frequency can vary more than the US but the number of cycles between 0800 on one day and the next is mandated to be correct (I presume +/- 25 :-)) ). So you would be chasing a moving target, and at no time of the day need

Re: [time-nuts] Very large X9.2 solar flare.

time-nuts] Very large X9.2 solar flare. It also produced a CME. Read the note on spaceweather.com. David N1HAC On 9/6/17 5:19 PM, Alan Melia wrote: The flare has been and gone!...is this another case of journalists mixing up a flare with a CME ? Alan G3NYK - Original Mess

Re: [time-nuts] Very large X9.2 solar flare.

The flare has been and gone!...is this another case of journalists mixing up a flare with a CME ? Alan G3NYK - Original Message - From: "Mark Sims" To: Sent: Wednesday, September 06, 2017 8:50 PM Subject: [time-nuts] Very large X9.2 solar

Re: [time-nuts] Fwd: [hpsdr] SDR experiment for the solar eclipse

timestamps. :-) John On 08/03/2017 03:57 PM, Alan Melia wrote: A Time Nut would measure phase change across the path of totality using GPS locked SDR receivers :-)) As was done on the Eclipse that passed between the UK and Iceland a couple of years ago. Keflavik NRK's ionospheric signal wa

Re: [time-nuts] Fwd: [hpsdr] SDR experiment for the solar eclipse

A Time Nut would measure phase change across the path of totality using GPS locked SDR receivers :-)) As was done on the Eclipse that passed between the UK and Iceland a couple of years ago. Keflavik NRK's ionospheric signal was returned from inside the path of totality to most of the north of

Re: [time-nuts] Halcyon OFS

Hi Clint I have had one of these from new. It divides the amplified incomming carrier by either 99 or 81 (4526) and phase compares with 2kHz from the divided down 10MHz discrete VCXO to phase lock the 10MHz. My unit serial number 1151 has no other crystals in it. It possible they are filters

Re: [time-nuts] backfill (was: Poor man's oven)

Hi Bob, it also depends on what you allow to leak into the vacuum. Hydrogen is a pretty effective remover of heat :-)) Alan G3NYK - Original Message - From: "Bob kb8tq" To: "Discussion of precise time and frequency measurement" Sent: Thursday,

Re: [time-nuts] Anthorn eLoran

Hi Peter Ah that sounds more like it. Aerial maintenaance shuts down the whole site these dats including MSF. There is really no reason for them to keep it running but I think Trinity House are paying the bill. It cannot be used for nav without Lessay and the output from Sylt, So I muse that

Re: [time-nuts] Measuring coax temperature coefficient with a TICC

MMmm interesting but what about skindepth ?? surely the "R" is not DC R so would it matter? RF currents travelling in the copper anyway. I suspect that a steel inner might increase the L/unit length?, maybe this is more significant or not as is sceened by copper?? Alan G3NYK - Original

Re: [time-nuts] Bye-Bye Crystals

.and some micro-soldering kit to attach the plated unit to the lead frame. Our factory used homemade hot air jets, I have no idea what the solder was prob LMP. Lapping a single blank is difficult, one tends to get rounded edges(even with the best machine) which affect the activity. See

Re: [time-nuts] RFDO - Experience and questions

Paul the off-air standards I have and another UK make I dont posses divide the 10MHz standard and the off-air carrier down to 2kHz for locking. It may not be the best but it is generally adequate for off air LF standard distribution. My unit will cover 162kHz or 198kHz. Alan G3NYK -

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 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] Something odd - ionosphere?

I doubt that was the cause. The stream was high velocity but low density, The geomagnetic activity has been relatively low with little precipitation. Th Kp has touched 4 but that is not unusual and what you report seems an unusual event. NOAA data is more reliable than Spaceweather which tends

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] 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] 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:

Re: [time-nuts] Prologix USB-GPIB Controller

There is another way to those possible Dave Kirby quotes.remember silicon foundry lines run lots of wafers through the fab line at one time these are tested automatically and inked at the end of the process and put inro store. The wafer are drawn and cut and encapsulated (sometime halfway

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] 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] 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] 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] 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] 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] 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] 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

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] 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] 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] 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] 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] 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] 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] 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] 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] 10811

Yes below about 4v is the only place where you get the real Zener effect, as you go above 5v it becomes Avalanche Breakdown. The trick is zener effect has a negative tempco and avalanche a positive one (I thinkthey are opposite senses anyway :-)) ) the result is a regulator diode

Re: [time-nuts] Division Circuit

Isn't the 10i/p gate to do the divide by N+1?? not just to avoid an all zeros switch on which does not need all 10 stages fed back if all you want is an N stage ring counter?? Alan G3NYK - Original Message - From: Tim Shoppa tsho...@gmail.com To: Said Jackson saidj...@aol.com;

Re: [time-nuts] Quad Driven Mixer 5 to 10 MHz Doubler Atricle

As a subscriber to QEX I saw this article but thought that the bi-phase rectifier was a lot easier and has be well characterised by the time-nuts experts. Now it has shown up here I would be interested to hear from those experimenting how badly the NE602 performs compared with a passive DBM

Re: [time-nuts] BBC TV program Click has material about GPS jammingand e Loran

The politics of this system are a bit dubious as are the claims on accuracy and freedon from jamming. But it does give us another off-air frequency standard. Alan G3NYK - Original Message - From: Dr. David Kirkby (Kirkby Microwave Ltd) drkir...@kirkbymicrowave.co.uk To: Discussion

Re: [time-nuts] Digital temperature compensation

Mmmm yes you can see the equation evaluation starting to rise in your Warmer plot, as Mark says, which will make a nonsense of the formula if your summer temps get above 28. Why not a table and then interpolate between the table data points?. You might have more points where the changes are

Re: [time-nuts] Price of LTE Lite GPSDO vs Trimble Thunderbolt.

Said I read through the description carefully .I suggest you request a refund from eBay for their use of incompetant computer translation which fails to recognise English technical words and phases, so blocking your paid for posting. The trigger can only be due to a stupid word selection in

Re: [time-nuts] fast switching quiet synthesizer

Jim I am not sure if this will meet your requirement for hygene but google Trinity Power Inc (Bob Yarbrough) he has a unit that was featured in EDN some time around a year ago. I doesnt switch fast enough at present but that could be altered. the problem might be that I think it is a PLL

Re: [time-nuts] fast switching quiet synthesizer

Hi Don, Jim, that is the one I was refering to, It has a VCO as the source (all part of the AD4351) but I think your description of the unit is more accurate that mine. Contact him directly he is keen to contact new areas and hobbyists. There are two units one is a source with 4 output levels,

Re: [time-nuts] fast switching quiet synthesizer

Jim, Bob Yarbrough's built units do 50 to 4400MHz, +10dBm and input for external 10MHz ref signals, though has an internal 10MHz TCXO. It sounds worth a try if it can be programmed to step fast enough, min step size is 1kHz (from memory). Alan G3NYK - Original Message - From: Jim

Re: [time-nuts] Diodes as temperature sensors

Simple temperature sensors use the static diode characteristic, but a more accurate method is to use the slope of the characteristic, this is independent of individual diode parameters, though requires a little it more electronics to display. There are many papers on this back in the 1960/70s.

Re: [time-nuts] temperature sensor

er not boiling watersteam. Water's boiling point is affected by the dissolved gasses and other contaminants. Alan G3NYK - Original Message - From: Bill Dailey docdai...@gmail.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Monday, July 21,

Re: [time-nuts] temperature sensor

/2012Issues.html http://www.prc68.com/I/DietNutrition.html Alan Melia wrote: er not boiling watersteam. Water's boiling point is affected by the dissolved gasses and other contaminants. Alan G3NYK - Original Message - From: Bill Dailey docdai...@gmail.com To: Discussion of precise time

Re: [time-nuts] Phase noise and geomagnetism

Hi Antonio you must remember the static geomagnetic field is around 50,000nT and the biggest Solar induced events are around 500nT so the effect might be difficut to detect as events of this size are not very common. More common events are in the 100 to 200nT range. Alan G3NYK -

Re: [time-nuts] frequency comparator reading question

These units multiply the frequency delta and the phase change quoted is probably 10^n times the actual difference. The output is f + n*delta(f) I have but do not use a Montronix 100-7 (before the Fluke purchase) Alan G3NYK - Original Message - From: Bill Hawkins b...@iaxs.net To:

Re: [time-nuts] WWVB antennas

Claims on antenna efficiency at these frequencies are fairly meaningless (as always) in that a normal antenna efficiency would be less than 1% !! Alan G3NYK - Original Message - From: JIM FARLEY jimfar...@att.net To: t...@patoka.org; Discussion of precise time and frequency

Re: [time-nuts] Mini Circuits RF TX question

It isnt going to help I guess but WB transformers for 50ohm are usually designed with a reactance of 150 ohms (3* termination) at the lowest frequency required. It might give an idea where to look?. Alan G3NYK - Original Message - From: cdel...@juno.com To: time-nuts@febo.com Sent:

Re: [time-nuts] OT - Old Hatfield 2105 Step attenuator specs

Hi Alberto it is quite interesting to continue that test with no attenuator but the shells of the coax plugs connected together. I would guess with the gear you have the resultant would be at least 120dB downbut this is not the case for all signal generators! The result is usually

Re: [time-nuts] OT - Old Hatfield 2105 Step attenuator specs

Hi Guiseppi I think I have some papers on them somewhere.I cant remember the model numbers. If you are refering to the units in blue crackle diecast case with miniature toggle switches the spec max frequency is 150MHz from memory. I did plot one some time ago on my Spectrum Analyser and TG,

Re: [time-nuts] OT - Old Hatfield 2105 Step attenuator specs

Hi agn Giuseppi that may indicate your units date from later, after the company were acquired by Pascall Alan - Original Message - From: Giuseppe Marullo giuse...@marullo.it To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Monday, January 06, 2014 4:05

Re: [time-nuts] Measuring TV delays

Hi Bill both the 405 line and the 625 line PAL and SECAM systems in Europe framed at 25 fpsec prob for the same reason .even though by 625 line inception the sets were transistorised often except for the line output stage. A chat to a BBC engineer at NPL Teddington at a Time Freq Club

Re: [time-nuts] GPS timing antenna 5 meter BNC Plug with cable

Hi David I have no experience of that unit, but I have had several orders serviced by them over a couple of years and I have no complaints and their customer service (Kiki) is helpful Alan G3NYK - Original Message - From: David J Taylor david-tay...@blueyonder.co.uk To: Time-nuts

Re: [time-nuts] Problem with site?

My last message arrived at 0559 this morning 22nd Oct Alan G3NYK - Original Message - From: Rob Kimberley robkimber...@btinternet.com To: 'Discussion of precise time and frequency measurement' time-nuts@febo.com Sent: Tuesday, October 22, 2013 12:52 PM Subject: [time-nuts] Problem

Re: [time-nuts] How hard is it to detect a GPS Jammer?

Many scanners now go to that frequency e.g AOR AR-8600. (100kHz to 2GHz ) They are hardly state-of-the-art receivers but should be capable of detecting jammers driving past. However a new unit is quite pricey $1000 equivalent in the UK as little as $300 for a used version. Also the AMSAT FCD

Re: [time-nuts] exponential+linear fit

I agree a fit to an equation that has no physical meaning is a bit spurious. You can fit almost anything to a polynomial, but it doesnt mean that the coefficients mean anything or that an interpolation between data points is even sensible!! I have been the victim of a clever maths graduate

Re: [time-nuts] exponential+linear fit

Hi Joe that sounds like a system I was thinking of suggesting to Jim. I wrote some iterative code on a time share bureau machine in the late60s. make a guess at kx values and let the prog spit out k values for a dk/dt minimum then chose another set of starters an see if it finishes in

Re: [time-nuts] exponential+linear fit

Jim it may not be helpful but had you thoughtof expanding the exponential as the first few terms of an infinite series to see if it simplifies fitting? Alan G3NYK - Original Message - From: Jim Lux jim...@earthlink.net To: time-nuts@febo.com Sent: Friday, October 04, 2013 10:16 PM

Re: [time-nuts] NIST off-line

On Topic I hope Tom :-)) ..I have just used the NIST time server to correct a PC clock here in the UK so it cannot all be down ?? Alan G3NYK - Original Message - From: Tom Van Baak t...@leapsecond.com To: Discussion of precise time and frequency measurement time-nuts@febo.com

Re: [time-nuts] Pulsars make a GPS for the cosmos

There is actually little at 1421MHz from the sun the radiation from the sun is black body radiation 1421 is an electron flip more likely in isolated molecules (the sun is plasma not gas) or Hydrogen masers. We set up 12Ghz sat LNBs a couple of weekends ago to try and stimulate some school

Re: [time-nuts] FCC politics vs their engineers...

Was it not always so?? Remember the politicians pay the bills not the engineers! Alan G3NYK - Original Message - From: Eric Williams wd6...@gmail.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Tuesday, September 17, 2013 7:04 PM Subject: Re:

Re: [time-nuts] Lightning Strike Site, Latency of AS3935 IRQ output

tenth of a second. Tom Bales Message: 3 Date: Tue, 10 Sep 2013 00:34:49 +0100 From: Alan Melia alan.me...@btinternet.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: Re: [time-nuts] Lightning Strike Site (Jim Lux) Message-ID

Re: [time-nuts] Lightning Strike Site (Jim Lux)

Come on fellas it can't be that difficult to input a pulse to the chip and measure the prop delay to the INT pin this is timenuts after all :-)) Alan G3NYK - Original Message - From: Jim Lux jim...@earthlink.net To: time-nuts@febo.com Sent: Tuesday, September 10, 2013 12:08 AM

Re: [time-nuts] sub-minute time-precision in court-case

I remember a lecture by an officer of the (London) Met Police about how tracable time was essential to demolishing the defence of wrong clock in accidents involving the illegal use of mobile phones when moving and even parking meter tickets. They had to argue why the cell time was more right

Re: [time-nuts] Halcyon OFS-1 Circuit Diagram or Manual?

Hi Mike I have had a Halcyon OFS-1 for 20 years and been looking for a manual/circuit during that time. Mine was bought from Halcyon and came with an A4 sheet of paper !Not alignment instructions!! I have been looking for detail ever since. I would certainly be interested to see a copy of

Re: [time-nuts] How quartz crystals are (were) fabricated

all crystals would have been subject to X-rays to some extent because this was how the planes were located and the cutting angles determined. The dose rate was probably quite low in this case.I dont remember seeing much protection around the machine in the lab I worked in. Alan G3NYK

Re: [time-nuts] How quartz crystals are (were) fabricated

Hi Charles yes I didn't actually run the videowas saving it for later :-)) this suggests bond disruption is being used. Like musical string if you stiffen the material the resonant frequency should drop. One can only guess this is what might be happening. The lab I was working in (though

Re: [time-nuts] WWVB odd propagation 07/14/2013

Hi Paul a major geomag storm occured around midnight UTC on the 14/15th. This precipitated hot electrons into the D-region which causes extra attenuation at night and enhanced daytime long distance signals. The daytime effect is usually short lived but the night-time absorbtion may continue for

Re: [time-nuts] What is the deal with li...@lazygranch.com

Hi Doug what software are using as your mail client, and under what OS. I have had similar effects on an older system. I seem to get the lists postings ok. Alan G3NYK - Original Message - From: Doug Calvert dfc-l...@douglasfcalvert.net To: Discussion of precise time and frequency

Re: [time-nuts] What is the deal with li...@lazygranch.com

Yes it's not you Doug I think he has a problen, in the archive for June he has two blank messages then a message titled test. So guess he is sorting it. I get fat-finger syndrome sometimes and hit send button instead of the button to the left (delete) :-)) Alan

Re: [time-nuts] Ground loops in measurements?

Hi Bob whats the problem at low freqs ?? I thought leakage was a function of the size of the holesv the wavelengthor are we into braid skin effect below 100kHz?? so as not to drag this OT a reference will suffice in answer. Best Wishes Alan G3NYK - Original Message - From: Bob

Re: [time-nuts] OCXO Adjustment Question

I use this method too, but I also find it little use trying to get the internal reference down to the last squeak in 10^11 on this kind of kit. It will not hold the setting for vey long and it takes ages to get the adjustment spot on. I get as close as I can easily.then allow the unknown

Re: [time-nuts] Italian Time Station on 10 MHz ?

Hi Marco maybe you should run a web site with daily measurements and shame them into doing it properly ( your traceable to NIST should raise some hackles !!) I took me four months to get a short term wander on 198kHz looked at a few years ago. I was cured when the synth finally failed

Re: [time-nuts] Brooks Shera ASM release

disapointed but not unhappy. I certainly appreciate the help and expertise the Group provides..and it is nice to be able to say so, and salute the work Brooks did. Thanks and Best Wishes Alan Melia (G3NYK) - Original Message - From: ewkeh...@aol.com To: time-nuts@febo.com Sent: Monday

Re: [time-nuts] Brooks Shera ASM release

of remembrance of his worldwide friends, for his family? Even if it is just a me too replying to this message. Alan Melia (G3NYK) Ipswich, UK ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman

Re: [time-nuts] Brooks Shera ASM release

Bert is there any way we can add our names to some expression of thanks to his widow Karen and her helpers for their work and maybe leave a remembrance of his worldwide friends for his family? Thanks for your efforts Best wishes Alan Melia (G3NYK) UK - Original Message - From

Re: [time-nuts] Low-pass Filter for 5 and 10 MHz

Maybe a silly question but isnt the phase response of the filter important in this application ?? notches have fairly vicious phase shifts. Alan G3NYK - Original Message - From: Luciano Paramithiotti timeok...@gmail.com To: time-nuts@febo.com Sent: Thursday, April 11, 2013 5:42 PM

[time-nuts] GPS antenna??

Hi all an interesting problem you may have encountered, I want to use a GPS frequency standard inside a building with no opening windows (opening windows are known as air conditioning in the UK :-)) ) This is part of a two day amateur microwave conference so we should have the expertise. I

Re: [time-nuts] GPS antenna??

...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Alan Melia Sent: Monday, April 08, 2013 1:00 PM To: time-nuts measurement Subject: [time-nuts] GPS antenna?? Hi all an interesting problem you may have encountered, I want to use a GPS frequency standard inside a building with no opening

Re: [time-nuts] GPS antenna??

Hi Tom yes I have produced some similar plots I think they get cold feet about 70deg N. I'm not sure of the actual value it is a long time since I played with that last. Alan - Original Message - From: Tom Van Baak t...@leapsecond.com To: Discussion of precise time and frequency

Re: [time-nuts] GPS antenna??

Hi David yes its ferro-concrete which makes quite a good screen (a lot worse than domestic brick) but the windows are not coated I think. (BT Labs at Martlesham) Thanks all for some thought stimulating ideas .GPSDO outside might not be too easy1U rack case mains poweredno power

Re: [time-nuts] GPS antenna??

. It's easy to test by looking at your indoor SV count and reception levels. With patch antennae you don't have to worry about RHCP issues, right? /tvb - Original Message - From: Alan Melia alan.me...@btinternet.com To: time-nuts measurement time-nuts@febo.com Sent: Monday, April 08, 2013

Re: [time-nuts] Releasing sources (was Re: Brooks Shera)

Hi John Please dont take it down! remember there are more of us who quietly appreciate sites like yours. I once suggested to a query the answer was in the help file and background by googling or using wikipedia, and was told it was a lot easier and quicker to play dumb and ask.!! I also suggest

Re: [time-nuts] Don't use cheap cables -- a cautionary tale

Some of the older synchronised signal generators (2-box systems) e.g Marconi, used TNC connectors with solid coax where signal leakage was likely to be a problem. Alan G3NYK - Original Message - From: Volker Esper ail...@t-online.de To: time-nuts@febo.com Sent: Sunday, March 03, 2013

Re: [time-nuts] PTS 3200 remote programming

unit the shares latch the 100mhz with the 10mhz. The 1ghz latch is shared by the 1hz decade. Best regards 73! Iban eb3frn On Fri, Mar 1, 2013 at 8:27 PM, Alan Melia alan.me...@btinternet.com wrote: Hi Iban do you have a manual? they are available. From memory because its a while since I worked

Re: [time-nuts] PTS 3200 remote programming

Hi Iban do you have a manual? they are available. From memory because its a while since I worked on my Wavetek- Rockland unit I believe the remote programming is in parallel with the front panel switches. The reason for raising this is that there may be a problem on the back of the panel

Re: [time-nuts] OT - USB to LPT Adapter - Does it exist?

I dont have the reference in front of me but it might just be worth checking the article archive for the Elektor magazine.I have a vague feeing I might have seen something there. Many of their past projects have used the LPT as a programmable port. There should be an article index on their

Re: [time-nuts] eLoran for GPS backup

Hi Chuck, It never went off!! The French are spear-heading this. An experimental eLoran station was run from Rugby (GBR site) before it finally closed then the gear was relocated to be run by VT Communications, now Babcock I believe, based on Anthorn (south bank of the Solway Firth). This uses

Re: [time-nuts] YIG oscillators

Hi Daniel, I cant remember the reference the web site might help but there have been at least a couple of articles on YIG modules in VHF Comms magazine Alan G3NYK - Original Message - From: Daniel Mendes dmend...@gmail.com To: Discussion of precise time and frequency measurement

Re: [time-nuts] time-nuts Digest, Vol 101, Issue 152

Volker.look at the subject line, the posting is in your hands, you dont need to just use the reply button, as somone did with a digest which forked the thread.. This means all the posing under Digest are hidden from view and searching. You can edit the subject line but this does not

  1   2   3   4   >