Re: [time-nuts] [EXTERNAL EMAIL] Sayrosa 607B Frequency Synthesiser

Hi Nigel, It will also be the first info on the 607B that I have ever seen I will certainly download it when I get home (work filtering forbids it, with much else). Should allow me to fish my one out of the attic and actually use it - after letting the magic smoke out of the tants, of c

Re: [time-nuts] 4046 replacement

Hi Donald, I've just had this problem - the 'signal' input (p14) to the phase detectors is a 'bodge' linear amplifier built around standard CMOS stages and it doesn’t work right. A resistor around a CMOS inverter was a good old recipe to get a 'linear' amplifier stage but this design appears to

[time-nuts] E-Loran

Looks like the S. Koreans are pressing ahead with their e-Loran system. http://insidegnss.com/node/5598 'Old' tech never dies Paul G8GJA ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mai

Re: [time-nuts] Ships fooled in GPS spoofing attack suggest Russian cyberweapon

This was referred to in my post (subject: 'Loran') on 8/8/17 and was a news item in 'Inside GNSS' and other journals before that. Didn't get many comments on my post :-( Must have used the wrong subject Paul G8GJA -Original Message- From: time-nuts [mailto:time-nuts-boun...@

[time-nuts] Loran

And a link to a recent article about the possibility of Loran coming back or, at least, you are thinking about it over there. https://arstechnica.co.uk/gadgets/2017/08/radio-navigation-set-to-make-global-return-as-gps-backup-because-cyber/ Paul Reeves, G8GJA __

Re: [time-nuts] Vintage Frequency Measurement

The start of the next sentence has been incorporated in the link. Just remove the "So" at the endworks fine. Regards, PaulG8GJA -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Camp Sent: 15 February 2017 12:36 To: Robert Atkinson; Disc

Re: [time-nuts] Thermal effects on cables

ssion of precise time and frequency measurement Subject: Re: [time-nuts] Thermal effects on cables On Mon, 23 Jan 2017 15:13:39 + REEVES Paul wrote: > Surely the impedance of the cable is only affected by the ratio of the > inner conductor and outer conductor diameters modified by t

Re: [time-nuts] Thermal effects on cables

Hi David, Surely the impedance of the cable is only affected by the ratio of the inner conductor and outer conductor diameters modified by the internal dielectric constant, nothing to do with the frequency of operation. You might well have problems converting the larger diameters down to a suit

[time-nuts] Galileo clock failure

It seems like the Rb and H-maser clocks on the Galileo satellites might be experiencing a problem Here is a link to a BBC report: http://www.bbc.co.uk/news/science-environment-38664225 "What do you mean, ' nobody told us they were meant to work in vacuum' ?" Paul Reeves Senior Engineer Thal

Re: [time-nuts] low noise multiplication to 100 MHz

Why not use something like an HP5254B/C ? They give out 50MHz harmonics up to the low Ghz region, all filtered by a nice high-Q tuneable cavity. All to typical HP build quality. Of course, they have an amount of 'not needed' circuitry and are just a bit . , well, bulky. Good clean output

Re: [time-nuts] End of Loran-C in Europe confirmed.

Hi Iain, ...and a damned shame too - there goes another standard. Just when the Americans seem to be doing a u-turn

Re: [time-nuts] What sort of oscillator is this?

David, Just a thought but have you tried Pasternack? They do 'custom' precision cabling including 2.4mm connector options. regards, Paul, G8GJA -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Dr. David Kirkby (Kirkby Microwave Ltd) Sent: 30 Septem

Re: [time-nuts] GPSDO standard interface?

Chris, NMEA is a good 'general purpose' interface for GPS units but I thought this thread was about the GPSDO interface. Not quite the same - TSIP/SCPI would make rather more sense here, especially with all those Thunderbolts about :-) Most GPS receivers still supply at least one serial interface

Re: [time-nuts] FE5680 GPS Disciplined Controller

Hi Bert, I would definitely be interested in a kit. regards, Paul G8GJA -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of ewkeh...@aol.com Sent: 18 June 2014 19:49 To: time-nuts@febo.com Subject: [time-nuts] FE5680 GPS Disciplined C

Re: [time-nuts] optically excite a quartz crystal?

I'll have to check (dig it out from under a pile of gear.) but if I remember correctly the HRO receiver (at least the early, pre-war, ones) had a 'non-contact' crystal holder for the IF notch filter. The crystal was a block about 1/2" square and a bit less thick (-ish) and fitted loosely bet

[time-nuts] zero crossing detector in PIC mcu

This might have been mentioned before in the discussions on zero crossing detection for mains power monitoring (apologies if I missed it) but this chip (or series thereof) looks interesting - http://www.eejournal.com/archives/articles/20140409-tinyterror/ and the article is fairly amusing t

Re: [time-nuts] Choke Ring Antenna - Patch Placement?

Hi Bob, Not quite true, the first couple of sentences are ok but the helix antennas used for GPS are quadrifilar volute helices, not the longer axial mode type, and their gain characteristic can be modified to provide an almost perfect pattern for satellite reception with a 'flat-top' elevation

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

Some of them might be... you could certainly speculate that any culture that has attained sufficient technology to make interstellar travel possible (and need navigation beacons) would probably have sufficient power to 'engineer' the occasional neutron star into the correct configuration. O

Re: [time-nuts] HP5065B !!!

I rather agree with Bruce. What I have seen on recent improvements on laser diode accuracy/stability results seem to imply a rather large improvement is possible - and, as the HP5065A is a rather rare beast indeed on this side of the Atlantic, the excellent work done by Corby is not of direct re

Re: [time-nuts] Brooks Shera ASM release

Hmmm, apostrophe slip - apologies to any grammar-nuts amongst the time-nuts.. regards, Paul R -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of REEVES Paul Sent: 16 April 2013 08:07 To: Discussion of precise time and frequency

Re: [time-nuts] Brooks Shera ASM release

Bert, I certainly appreciate all the work that has gone into the latest code. I learnt a lot from Brook's original (1.33) and modified it to suit my 'peculiar' hardware. I've only had time for a short look at the latest but I'm sure there is MUCH to learn here too. A very well written program wi

Re: [time-nuts] GPS antenna??

That's odd, I'm sure we are using one here - and have been for quite a few years. It was used to supply gps signals to buoy systems which were being tested indoors. I seem to recall it was a bit 'hit and miss' and suffered from multipath problems (but it was set up by the sonar guys who don't kn

Re: [time-nuts] eLoran for GPS backup

Actually it has been on all the time - this is just a more extensive implementation of the (formerly experimental) e-loran 'add-in' to target high usage areas. Paul Reeves G8GJA -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Chuck

Re: [time-nuts] Comparing PPS from 2 GPS units

I think not Wireline. That has a rather 'loose' twist coupling between the two internal lines. The cable is probably purpose designed for use in delay lines and actually did have a helically wound inner conductor. In a previous life working for a bit of Marconi that made tv camera systems we use

Re: [time-nuts] Nifty "MINI TIC" for DMTD work

and one more for the list! regards, Paul -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of ewkeh...@aol.com Sent: 19 November 2012 19:53 To: time-nuts@febo.com Subject: Re: [time-nuts] Nifty "MINI TIC" for DMTD work Don lets see how

Re: [time-nuts] Lady Heather on a Laptop

atom based mini-ITX boards are available from ~60GBP (low-end, ~1.2GHz) to about ~140GBP (dual-core + loads of I/O). Not looked recently as I've got all I need (at the moment). Situation your side of the pond should be similar. Not expensive. regards, Paul G8GJA -Original Message-

Re: [time-nuts] FE5680 missing PPS soln

9mA PaulG8GJA -Original Message- From: Attila Kinali [mailto:att...@kinali.ch] Sent: 03 February 2012 12:55 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] FE5680 missing PPS soln On Fri, 3 Feb 2012 09:50:52 - "Rob Kimberley" wrote: > Mine wa

Re: [time-nuts] "The GPS navigation is the weakest point,"

I believe one of our research establishments was experimenting with a multistatic radar system based on cellphone tower transmissions and did a very good job of tracking one of the first (if not the first...) 'stealth' aircraft that the US sent over this way. Certain persons were rather annoyed whe

Re: [time-nuts] "The GPS navigation is the weakest point,"

Not so sure - it's a light blue colour (presumably undeneath too) so would not be too visible against blue sky looking up. WW2 PRU Spitfires used the same paint scheme ('duck egg' blue?), I believe, to get around German visual obervation. Could be wrong, shoot me down. :-) Paul Reeves G8G

Re: [time-nuts] "The GPS navigation is the weakest point,"

I seem to remember a recent 'jamming' trial off the east coast of England that didn't kill the GPS but did shift the position of the ships involved - certainly enough to get them aground or to hit something if they weren't paying attention. I think one showed up inland - which should have been sus

Re: [time-nuts] gravity controlled pendulumn clock?

Capacitance is, of course, measured in 'jars' as per the 'Admiralty Handbook of Wireless Telegraphy' (1930 -ish) :-) I do use Farads (bits of them, anyway) guys, really. Paul Reeves G8GJA -Original Message- From: Don Latham [mailto:d...@montana.com] Sent: 14 December 2011 21:02 To

Re: [time-nuts] gravity controlled pendulumn clock?

ments are DEFINED in terms of metric. eg your inch is 25.4 mm exactly. By definition. It has been estimated you could save a trillion dollars a year in your economy by converting - which you will ultimately do. I just hope it is in my lifetime. On Wednesday, 14 December 2011, Reeves Paul wrote: &g

Re: [time-nuts] gravity controlled pendulumn clock?

Oh dear, what have I helped to get going :-) It has certainly been interesting reading! My point was, as Chuck notes, that the metre, kilogram etc. are no more 'precise' than a yard, pound etc. being, essentially, arbitrary units and the 'imperial' units can be defined just as accurately and in the

Re: [time-nuts] gravity controlled pendulumn clock?

...and just what is 'less accurate' about pounds, feet, cubic yards etc? The metric system (I use the term loosely) is ideal for those people who cannot do mental arithmetic and can only shift decimal points. All 'imperial' measurements can be defined just as the metre, kilogramme (and there is a d

Re: [time-nuts] [Solved] Looking for multiple PPS timestamp loggi ng

And there is this kit from Andy, G4JNT, which might do www.g4jnt.com/HF-10.htm http://www.g4jnt.com/SerialLogger_ShortForm.pdf Paul G8GJA -Original Message- From: shali...@gmail.com [mailto:shali...@gmail.com] Sent: 05 October 2011 21:00 To: Time-Nuts Subject: Re: [time-nuts]

Re: [time-nuts] Frequency counter recommendation

It's OK for you guys in the USA with lots of old HP gear around but for us over the other side of the pond we can only dream of those sort of surplus quantities - let alone the prices Still, it's nice to dream. A 'purpose built' design of a front end might well have quite a few people int

Re: [time-nuts] Time of death-Again

I think you may be thinking of 'Dark Star', not too sure (been a while since I last saw it)about the bomb (bomb number 20 with a mind of its own) but one of the crew attempted re-entry on a surfboard :-) Paul g8gja -Original Message- From: d.sei...@comcast.net [mailto:d.sei...@comc

Re: [time-nuts] Pulsars (was: 60 KHz Receiver)

Receiving setup - pretty standard amateur eme/radio astromony kit, good antenna, LNA, downconverter. Antenna choice depends on frequency, pulsars are broadband but generally 300 MHz to as many GHz as you can build an LNA. Amateur attempts seem to be 406, ~600, ~1400MHz. 3m dish minimum or equival

Re: [time-nuts] PICTIC II

And here is a request for yet another, to keep the price down :-) regards, paulg8gja -Original Message- From: Stanley Reynolds [mailto:stanley_reyno...@yahoo.com] Sent: 01 July 2010 16:42 To: time-nuts@febo.com Subject: Re: [time-nuts] PICTIC II The price would be at my cost and act

Re: [time-nuts] And you thought you were old

I did the same (a VERY long time ago...) with the OC71. Schoolboy funds could not reach OCP71 levels. They made good phototransistors until Mullard found out and started filling the glass encapsulations with a white compound. Spoilsports :-) But all you had to do was break the glass and scrape off

Re: [time-nuts] Frequency divider PCB: Current status on "pre-ord ers", and pointers to documentation.

Hello David, Could you add me to the list for one board please? regards Paul Reeves G8GJA -Original Message- From: David C. Partridge [mailto:david.partri...@dsl.pipex.com] Sent: 17 March 2010 18:28 To: teksco...@yahoogroups.com; tekscop...@yahoogroups.com; hp_agilent_equipm...@yahoo

Re: [time-nuts] Difference in GPS antennas

VHF weather imaging using Automatic Picture Transmission (APT) is still very much alive and operational both on NOAA and EUMETSAT birds despite the desire of the weathermen for ever greater bandwidths on 1.6GHz and above. It doesn't appear to improve their forecasting however... Paul Reeves,

Re: [time-nuts] Cathodeon TCXOs??

I'm pretty sure that I have a Cathodeon filter/osc catalogue at home (work reference material relocated due to constant 'downsizing' of storage space by my employer - "everything is on the internet"); I'll check up on it tonight. Paul G8GJA -Original Message- From: Alan Melia [mailto:al

Re: [time-nuts] 10 MHz Band-Pass Filter Needed

Try an old 10MBs Ethernet card - they have a nice packaged filter (contains 2 filters actually, 5 & 7 pole) which tidies up a 10MHz signal. Package is 'YCL 20F001N' but similar ones may exist. Essentially zero cost. Info from the UHF-Satcom group. cheers, Paul G8GJA -Original Message- F

Re: [time-nuts] Sulzer Labs D-5 oscillator

Hi Tom, all, Sorry, the D-5 is a rectangular solid, 4"x4"x7", quite featureless except for the nameplate on the top and the connection pins, circular ~14pin, octal size (possibly a valve - sorry, 'tube' - base, on the bottom. I will try to get a couple of pictures off to the group within the next

[time-nuts] Sulzer Labs D-5 oscillator

Hi all, I need a bit of help getting an old Sulzer D-5 5MHz oscillator to work. It was built into a rack module with monitoring facilities and had been slightly 'got-at' by the previous owner. Some of the connections were pencilled on the case but not enough to give confidence about powering it u

Re: [time-nuts] Which GPS receiver?

Hello Murray, The ublox LEA-5T does not have the RAW data output facility of the LEA-4T, otherwise they are pretty much a drop-in replacement. This might be significant in some cases (and means I won't be giving up my LEA-4T system just yet...). I have a -5T on order and it will be interesting to