Re: [time-nuts] time-nuts Digest, Vol 167, Issue 23

Hi. Others have done similar with a Raspberry Pi and display for very much less cost.  There are several examples described on personal pages if you search.  Re-purposed Android tablet's could also be used too, as I have used in the past. There are PoE conversions for the Pi's as well, if needed.

Re: [time-nuts] Setting Time on WSPR Radio Transmitter

I don't know what cellular carrier you are using, but GSM phones can use "System" (as in GSM system, GPS disciplined) as their time source, and it works very well to within a small fraction of a second.   Well, here in the UK, Europe and Turkey where I've travelled to in the recent past, and the ph

Re: [time-nuts] time-nuts Digest, Vol 170, Issue 10

Sadly, you'll need more than just a lump of Ferrite to stop 60kHz escaping to the street via the power cables.. That, and you'll probably also find the home power circuit seriously polluted anyway around 60kHz, as a result of all the "other stuff" you have that uses small SMPS's, with little filte

[time-nuts] OT FTDI (Was Re: Trimble Thunderbolt Start Up RS-232)

FYI: Anyone with a "bricked" FTDI clone device, all that's been done is the VID/PID info has been rewritten to all zero's.  They are not "damaged", just "disabled" as a result. There are several public domain tools about to re-program that info, should you need.   Including a (somewhat fiddly) co

Re: [time-nuts] time-nuts Digest, Vol 170, Issue 26

Hi. He does answer emails, I just had a similar exchange with him. If your oscillator runs on a multiple of 25kHz, and cant wander close to the next multiple, it'll probably work OK, but look at his web-page before asking. http://oz5n.dk/   Look at the PDF version, much easier on the eyes. Rega

[time-nuts] A silly question ...

... Because I'm sure I should be able to figure this out for myself! I have (as many of you do also) one of the venerable Trimble Thunderbolt devices.  No problem with that.  All works fine, and is run 24/7, UPS backup power and all... I also have (again, as many of you do...) a free running OCXO

Re: [time-nuts] A silly question ...

nuts-requ...@lists.febo.com wrote: > Subject: Re: [time-nuts] A silly question ... > Message-ID: > <1538136285.3807422.1523450984.2c16d...@webmail.messagingengine.com> > Content-Type: text/plain; charset="utf-8" > > On Thu, Sep 27, 2018, at 11:55 AM, Dave B via time-nuts wrote: >> Tri

Re: [time-nuts] 10 MHz -> 16 MHz

Moot point with free running clock oscillators in the digitising sound cards often used.  Some of the all in one cards with fast A/D's and FPGA's etc can take an external frequency reference. Some "adjustment" of the data can be done in software, to calibrate the frequency domain.  Smoke and mirro

Re: [time-nuts] 10MHz standard for comms receivers

The problem with that approach to EMC compliance, is all it does is fool the QP detector in the test/measurement RX. It does nothing to actually reduce the amount of radiated crud, in essence, it's the result of excessive "Bean counting" by the production costs tracking types. Small parts may not

Re: [time-nuts] HP3325B as LO for a transceiver or receiver?

Hi. Usually on a crowded band, to be nice to the RF neighbours (often ourselves!)  Irrespective of the "mode" used, and/or getting the "best" performance (small signal sensitivity) from a receiver. Also, when multiplying/mixing up to microwave frequencies, again for a clean signal. The OP wanted

[time-nuts] NTPD versions and roll-over correction?

Hi. From what version of NTPD (on FreeBSD) would it correctly handle things like the recent GPS week roll-over? I think I may need to update things, just noticed that though the FreeBSD 8.x box's NTPD seems happy (After a 2 year idle period!) My ISP has royally f'd up, so I have no internet at h

Re: [time-nuts] timing properties of "spectru spreading", clocks

Date: Mon, 20 May 2019 20:41:51 -0500 From: "Bill Byrom" To: time-nuts@lists.febo.com Subject: Re: [time-nuts] timing properties of "spectru spreading" clocks Message-ID: <5e9c8b54-c30e-4e03-aba2-d4d96e5d8...@www.fastmail.com> Content-Type: text/plain;charset=utf-8 SSC (spread spectrum cl

[time-nuts] Updating the unit of,time: the second.

Hi. This from the recent ShortWave Radiogram broadcast, may be of interest. ~ ~ ~ (Snipped stuff about other SI units undergoing a revamp...) Scientists now have their sights set on updating the unit of time: the second. Currently, the second is defined by atomic clocks made of cesium atoms. T

Re: [time-nuts] Aerial coax downlead placement

On 05/07/2019 06:01, Gerhard Hoffmann wrote: >> Hello all, >> >> A new contact, whose background is in computer programming rather than >> RF, is getting into accurate GPS positioning, and has been tapping me for >> any knowledge I might have. I persuaded him to get the new Ublox F9P >> rece

Re: [time-nuts] 5 Mhz to 10 Mhz and 25 Mhz

On 10/09/2019 17:00, time-nuts-requ...@lists.febo.com wrote: > Re: [time-nuts] 5 Mhz to 10 Mhz and 25 Mhz Why not just create a comb of frequencies based on the 5 MHz input, then filter and extract the 10 and 25 MHz signals you want, amplify and distribute as needed?  Going the PLL route seems lik

Re: [time-nuts] 5 Mhz to 10 Mhz and 25 Mhz

Hi Paul. PLL's of course can introduce phase-noise, as well as remove it. Certainly if the reference 5 MHz is (phase)noisy then a PLL can clean that up, but if you multiply it (before cleaning) it gets much worse.   The multipliers themselves as someone else may chime in, can add to that I suspec

Re: [time-nuts] can of worms: time-of-day in a community radio station

Hi. Personally, I would not trust an "ISP" based NTP server!  From personal experience, they tend to run them on the heavily congested border/gateway systems.   As you can find and confirm using the usual network routing and diagnostic tools. As has been said, local GPS / Internet sync'd servers

Re: [time-nuts] time-nuts Digest, Vol 184, Issue 11

Nice work. That's what I call thinking outside the box! 73. Dave G8KBV. On 07/11/2019 21:14, time-nuts-requ...@lists.febo.com wrote: > From: folkert > To: time-nuts@lists.febo.com > Subject: [time-nuts] Syncing time via

Re: [time-nuts] time-nuts Digest, Vol 189, Issue 11

Hi Skip. Does the Austron even recognise the *IDN? query that Ni-Max uses to identify instruments?  Information on those is "thin" on the web. Is your ENET-GPIB able to work in analyser mode, so you can see exactly what's happening on the bus as the PC scans for devices? Check the cables.  If I

Re: [time-nuts] - LightSquared is back now called Ligado

Hi. Reading that web page, they are talking dBW levels, not dBm levels.  Hopefully that is a typo, as 0dBW is of course 1000 times more than 0dBm. To quote from the page:- The base-station power reduction is "from 32dBW to 9.8dBW," and Ligado committed to a 23MHz "guard-band using its own licen

Re: [time-nuts] time-nuts Digest, Vol 190, Issue 5

Has anyone found schematics for the Mean Well supplies? I have a couple of 15V 7A ones that will adjust down to 14.1 and I?d like to get them down to the 12-13.8 range. Steve WB0DBS If they have remote sensing, you can do stuff with that too. Else, trace out the cct around the voltage setti

Re: [time-nuts] time-nuts Digest, Vol 190, Issue 30

Hi. They call them "Low" noise, not No noise!  If you want/need the latter, then it's a linear regulated supply, or battery. Also sceptical that the "review" is hosted on the same site that is selling them... Look at the figures, for the same conditions, they tell the story, as do the spectrum p

[time-nuts] Elpromatime (Was Re: time-nuts Digest, Vol 191, Issue 28)

A funny looking "SMA" ended cable https://elpromatime.com/portfolio_page/time-server-nts-pico/  (Scroll down.) Also, has anyone tried this?  (An alternative to Meinberg on Windows perhaps...) https://elpromatime.com/downloads/    I'd take a look, but I don't run Windows here any more. Che

Re: [time-nuts] FEI Nanosync 2

Hi. Firstly, I don't "know" the device you've got, but it may only be possible to intercept the timecode and correct it there "on the fly". Unless, you can update the firmware on the FEI device, if such is available. (You could contact FEI-Zyfer and ask?) It may be easier just replace it with

Re: [time-nuts] time-nuts Digest, Vol 193, Issue 36

Of course, they may be pushed out to the surplus market, because they have aged/drifted out of spec, before they were removed (however that was done) from their original host equipment. But junk box storage is often "less than optimum" for lots of stuff, not just oscillators and crystals. 73. Da

[time-nuts] Efratom M100 Found on Ramco auction site.

https://www.bidspotter.co.uk/en-gb/auction-catalogues/ramco/catalogue-id-ramco-10255/lot-e55bd54e-6a87-44c7-8286-ac610134f040 Listed as a Crystal oscillator, but has a telltale mention of "Rb lamp voltage signal" ! It's an Efratom Model M100  Listed for £5.00 UKP !  (Located in the UK.) (There a

[time-nuts] TWT's was: Re: Voyager space probe question

The power supplies for them are interesting too. Especially when you get to the multi kW beasties with multiple collectors etc.  Floating high power HV supplies, referenced to the more negative Cathode potential. That's one of the things I do for the day job, fix TWTA's.   99% of the time, it's a

Re: [time-nuts] VFD Idea for HP Equipment

A lot of older HP kit, shares many of the same commands and queries etc between remote control methods.   Though the GPIB specific stuff, manipulating GPIB (or should that be HPIB) interrupt registers etc, is probably not included in the serial I/O protocol! Worth a look and a try if nothing e

[time-nuts] Re: time-nuts Digest, Vol 200, Issue 46

Hi Chris. Presuming you're interested in receiving QO100 with a LNB that doesn't drift like crazy (in our terms at least.) There are numerous pages on the intenet, that show how to modify some of the common LNB's to take an external LO reference. There are also some pre-modified on sale too

[time-nuts] Re: time-nuts Digest, Vol 201, Issue 24

Someone used 'php' and 'secure' in the same sentence?  :-)     Dave G8KBV On 15/04/2021 08:30, time-nuts-requ...@lists.febo.com wrote: php = a sort of more secure, advanced html (web page format) -- Created on and sent from a Unix like PC running and using free and open source software: ___

[time-nuts] [OT] Re: New Instrument Scan and Display software 3

On 05/05/2021 08:30, xaos wrote: Ideally, you want them on a web page. Why a "Web Page"?   That's for simple publishing, not comparing. If you want to compare results, best pull the data and put each measurement data set in a spreadsheet (or similar) so you can compare results and obtain n

[time-nuts] Tbolt

On 22/07/2021 08:30, time-nuts-requ...@lists.febo.com wrote: Message: 1 One more comment on the Vectron OCXO. My Tbolt shows a tuning voltage of +0.4 Volt and has 3.6 Hz per Volt. Assuming the OCXO was sold to Trimble with 0 V and my unit has at least 12 years on it (4380 days) aging is 3.29 E-

[time-nuts] Re: Tbolt

On 23/07/2021 08:30, time-nuts-requ...@lists.febo.com wrote: If you manually set the DAC with the commands LH nicely provides (LH is the*best* thing about these TBolts !!!) you will find it runs from -5 to +5V. The OCXO should tune linearly over that range ( all of mine do). If you take a saw

[time-nuts] Subject: Re: Tbolt

From: Gerhard Hoffmann Subject: [time-nuts] Re: Tbolt > I can only offer an opened Morion MV-89A. > The 10 MHz version is really 5 MHz + doubler. > It stopped oscillating with Vtune > 0.6V, so it was a natural candidate > for forensic medicine. > > < > https://www.flickr.com/photos/137684711@N0

[time-nuts] Re: Thunderbolt "good performance" example (Stewart Cobb)

> Hope you find this useful. > > Cheers! > --Stu > -- next part -- > A message part incompatible with plain text digests has been removed ... > Name: LabMainTbolt-2021-04-29.png > Type: image/png > Size: 87301 bytes > Desc: not available

[time-nuts] Re: Thunderbolt "good performance" example

Not on the plain text Daily Digest they don't.  Ever. Anyway, as another advised (Thanks Hal) I found it on the archives pages. (Where it confirms my thoughts that a GPS antenna in a roof-space populated with steel beams is not exactly a good choice.) Regards. Dave G8KBV. On 26/07/2021 08:3

[time-nuts] Re: time-nuts Digest, Vol 210, Issue 19

On 29/10/2021 08:30, time-nuts-requ...@lists.febo.com wrote: Hi all — The Marine Radio Historical Society out on Pt Reyes CA maintains (with the US Park Service) the KPH coastal station (originally Marconi, then RCA) as a working museum. (I highly recommend a

[time-nuts] Re: PN9000 software?

Hi. You might want to ask about that, on the Marconi Instruments, and/or IFR groups on groups.io https://groups.io/g/Marconi-Test-Instruments https://groups.io/g/IFR-Monitors There are some knowledgable ex employee types lurking on those lists who might know of a lead to follow, or where to

[time-nuts] Smiths Syncronome clock Up for auction (UK site.)

Spotted on a bidspotter listed auction site. https://bit.ly/3EjYOPe goes to:- https://www.bidspotter.co.uk/en-gb/auction-catalogues/ncm/catalogue-id-ncm-au10529/lot-ba659146-b592-4785-bc27-adfa011873dd Lot 101:  A Smiths Syncronome wall clock.  Located Scarborough UK.  Currently at £60 UK, not

[time-nuts] [OT] Re: Where do people get the time?

Off topic, but. They must have forgotten the time/date, as their web domain has expired! www.amkitchenandbar.com that is, as shown on the frontage. Or, perhaps they dropped the ball! I'll get my coat..     Dave G8KBV O

[time-nuts] Re: My AC measurement project & question

On 23/01/2022 08:30, time-nuts-requ...@lists.febo.com wrote: Stick with the transformer. The use of a capacitive divider is predicated on the line waveform always being a sine wave. Dream on! All it takes is one good spike down the line, maybe only 20-30V amplitude, and your capacitive divider

[time-nuts] Re: electronics question or how not to fry my raspberry pi

You can actually use a single small N channel MOSFET (2N7000 or similar) with it's Gate connected to the lower Vcc via, say, a 1k resistor.  (Not strictly needed, but with long leads, it helps prevent HF transient oscillation. Then use it's Source as the lower voltage data line, and it's Drain

[time-nuts] Re: DIY Low offset Phase Noise Analyzer (Erik, Kaashoek)

On 11/07/2022 08:30, time-nuts-requ...@lists.febo.com wrote: I also measured a Marconi 2022 signal generator and it was possible to lock but the phase noise was terrible with strong factional PLL spurs. Indeed, those signal generators are renown for having "some rather interesting" spectral co