[time-nuts] Austron 2000C, anyone?
Anyone has an Austron 2000C for sale? Need one for an experiment. Please offlist to ik1odo@gmail-com 73 - Marco IK1ODO ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] New GPSDO on EBAY From China
The OCXO is a Morion (Russia) MV89A. You may download a datasheet from http://www.morion.com.ru/catalog_pdf/MV89-OCXO.pdf Looks decent, stability vs. temperature and aging are as usual. BG7TBL is a Chinese radioamateur, quite known for his designs. 73 - Marco IK1ODO ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Italian Time Station on 10 MHz ?
For what I know they have an experimental license by the Telecom authority, and operate from Tuscany near Viareggio since two or three years. The license has been given on the basis that there are no more HF time and frequency signals operating in Europe. When I knew about it I offered to donate a rubidium standard, to have it at least on the right frequency. I had no answers... they continue to radiate a worthless off-frequency signal (IMHO). May be it is a case of beaconitis :-) (a disease that mandates to activate beacons). On a similar base, I know of an attempt to restore and put in operation the old transmitter of IBF (5 MHz, Istituto Nazionale di Elettrotecnica, now INRIM, the national standard keepers). That was a custom built 5 kW (carrier) Continental broadcasting TX. It has been found in the underground storage of INRIM, stripped of power and modulation transformers, and should be rebuilt to operate at only 1 kW carrier on the original 5 MHz frequency (Rb or GPS controlled!). The plans are to operate it from the original place on the hills near Torino, by remote control, as a museum and educative item. I offered my workshop to work on it, I hope that the project may go on to again hear IBF, IBF, IBF, standard time and frequency signals from the National Electrotechnical Institute, Turin, Italy from minutes 45 to 60 on 5 MHz ;-) Marco IK1ODO / AI4YF ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] OT: eBay Contact Congress
At 18:14 22-04-13, you wrote: I did trace the headers back via SpamCop before posting. The originating ISP looked sort of eBayish, sort of not eBayish... inconclusive... hence the question. -John Ebay emails always start with your nickname. True ebay administrative (billing) emails ALWAYS bear your complete name and surname. If it is not clearly addressed to you (in the email text, I mean) it is a physhing attempt. Marco IK1ODO ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] OT - DC-10 gyros
A good solution to generate 400 Hz (for European amateurs at least) may be this: http://www.helmut-singer.de/stock/1814769336.html Plus three amplifier stages, of course. I am interested in gyros too. Have a sealed Whittaker displacement gyro (marked as Western Electric GS-19719) and a Western Electric GA-10119 amount gyro (already opened but intact). Who has the connections for those? Marco IK1ODO ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Racal 9420 OCXO schematic?
The subject says it all: anyone has the schematic of the Racal 9420 OCXO? A friend has one that stopped oscillating, and want to give it a try. 73 - Marco IK1ODO ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] OT: Question on dead HP34401
At 21:40 11/12/2012, you wrote: Two comments the manuals available on agilent What on earth is a crossguard? Data exchange between a floating, guarded circuit and a ground referenced one? Marco IK1ODO ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Oscillator coupling
Very nice experiment on oscillator coupling: http://blogs.discovermagazine.com/cosmicvariance/2012/10/01/you-are-getting-sleeepy/ Quite time-nuts style, I would say. Marco IK1ODO ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] An interesting freq counter
At 02:46 01-05-12, you wrote: that is awesome! with Transistorized Binary Unit and up to 1.1 megacycles. wow! Hand made, one by one, on Veroboard... sigh... Marco IK1ODO ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Neutrinos not so fast? (defectove connector)
At 01:35 23-02-12, you wrote: I read that the news came from sources familiar with the experiment. Is there any official press release? Or only rumors? Antonio I8IOV Antonio, vedi Battiston su Le Scienze http://www.lescienze.it/news/2012/02/22/news/neutrini_pi_veloci_della_luce_era_un_problema_strumentale-868358/ e http://battiston-lescienze.blogautore.espresso.repubblica.it/2012/02/22/riecco-i-neutrini-probabilmente-piu-lenti/ Dovrebbero dire qualcosa di ufficiale oggi. Comunque l'errore di trigger dovuto allo slope del segnale purtroppo mi sembra credibile. Marco IK1ODO ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Neutrinos not so fast? (defectove connector)
sorry for previous message in Italian, had to be a personal one :-) Marco IK1ODO ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] How best to exchange Large files?
At 04:07 21-02-12, you wrote: Recording high speed and/or long general purpose raw Osc data, the file can become very large. I'm looking for a simple, fast and easy (and cheap) way to transfer large compressed data files of up to say a 100 MB between time-nuts. I know there are all kinds places one can store large files that others can then have access to, so I do not want to use the OLD way of breaking it up into many small pieces. I do not need to do this very often, so I do not want to sign up for any long term thing or maintain a Friends or face book type thing, I'm just looking for an easy, temporary way (say lasting up to a week each) to transfer a few big files that are too large to email. Suggestions anyone? Thanks ws Use a dropbox. Easy to use, and free. I just sent a 2.3 GB data file to a friend. Took half a day to upload, of course. Marco IK1ODO ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Literature on low noise and HF electronics
Another suggestion if you are interested in analogic design is Sergio Franco, Design with Operational Amplifiers and Analog Integrated Circuits, McGraw Hill, 1988 (and other newer editions). Common on ebay and amazon. Chapter 14 (noise in operational amplifiers) has been very useful to me. Marco IK1ODO ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] New Rubidium Frequency Standard Group
No new groups please, the Rb thread is interesting for time-nuts, and I don't see the need. 73 - Marco IK1ODO ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Ebay FE-5680A Rb: Are they that good?
Javier, the plots are nice, and I did the same years ago for an Efratom FRS-C. Found about the same data. The only point is that with the spectrum analyzer you see the S/A pahse noise, not the Rb, wich has to be orders of magnitude lower. About the comments on the waveform and harmonics contents: who cares about having the 2nd harmonic at -30 or -50 dB? For any practical use one has to square the signal, and the original harmonic content is of no pratical interest, or I am missing something ... 73 - Marco IK1ODO / AI4YF ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Ebay FE-5680A Rb: Are they that good?
At 14:21 09-12-11, you wrote: Marco Think you are correct for most things we do. However in communications for mixing and such a sine wave is desirable and a very clean output to minimize things like IMD and other products as we get the 10 MC to its final frequency. Since you are a ham you may appreciate that. Regards Paul WB8TSL Hello Paul, I understand, but don't agree 100% :-) - I mean, doing radio either you use the 10 MHz for syncing oscillators in you chain (I do that for EME, all is derived from a FRK-HLN), or you use the 10 MHz directly to a mixer. The mixer usually is inherently non linear; if you look at the current in the diodes of a ring mixer, it is almost squared. More it is squared, more abrupt is the diode switching, better the mixer dynamic range. And many mixers are sensitive to harmonics (see Tayloe mixer) of the input signal or use harmonic mixing schemes (see any S/A), only possible if the mixer current is highly non-sinusoidal. So, I agree with Javier about the search for existence of low lever spurious signals, but don't understand the need to have a (very) low harmonic content. Oh, well, to have too many harmonics is a bad thing - one time I had radiation problems from a coax feeding a 10 MHz squared signal, with components over 100 MHz - but this is an extreme case. 73 - Marco IK1ODO / AI4YF ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Ebay FE-5680A Rb: Are they that good?
At 18:23 09-12-11, Javier wrote: I think that the low-band preselector (I don't remember the model) was more oriented to increase the dynamic range for EMC testing, rather than due to a crappy harmonic response of the analyzer. It also includes a preamplifier. Correct. 85685A, a very expensive (then and now) piece. The problem there was to limit the impulse bandwidth of the frontend, harmonic response was not a concern. In general, if you want to reliably measure harmonics with a S/A, you have to cancel the fundamental, either with a notch or low pass filter. 73 - Marco IK1ODO ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Those pesky Neutrinos again...
At 08:16 21-11-11, you wrote: I heard on the BBC the other day that a repeat experiment is planned, firing neurinos from the US into Canada. The labs were not cited, but I expect it would be Fermilab to Sudbury Ontario. If this is the case, then there will still be the problem of not being able to run a parallel fibre as the Sudbury detectors are also deep underground. This means that the emitter-detector path length will still be a paper length, and if there is a problem with the reference frame definition, or time transfer methodology , then the results may also be subject to questions raised in the case of OPERA. The distance between these labs and the OPERA experiment are of the same order of magnitude so it will be interesting to see what hatches. Even if you could run a fiber exactly parallel and straight on the neutrino path (drilling a vey deep tunnel :-)) then the speed in the fiber will be lower than c, due to the refraction index. So, in any case a synchronization system is needed, and it is not necessary to run a straight fiber. 73 - Marco IK1ODO ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] 10k year clock
You all there probably already know, but ... very interesting, IMHO. http://spectrum.ieee.org/geek-life/profiles/engineering-the-10-000year-clock/0 73 - Marco IK1ODO ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] What's dBic on GPS antenna gain figures?
At 15:13 03-11-11, you wrote: So its just 'dB' relative to a circular polarised isotropic radiator - never knew that before! Correct. It is the standard way to declare the gain of a circularly polarized antenna when receiving or transmitting circularly polarized waves, as dBi is valid only for linearly polarized ones. 73 - Marco IK1ODO ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] the care and feeding of LPRO's
Eric, the power supply quality is not critical. The LPRO (like most other Rb's) has an internal switching power supply, so the wide tolerance in the primary power source voltage. I found other Rb's to be quite sensitive to vibrations, but when they are in a box, with a decent PS (I use an universal portable PC PS, the variety that may be programmed by means of a resistor in a plug) and an heat sink they are happy. Marco IK1ODO ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] OT: UK - NOTIFICATION OF GPS JAMMING EXERCISES
At 16:25 06-10-11, you wrote: So they are deploying LightSquared? :) Possibly testing for impact of ... ? Mala tempora currunt ! 73 - Marco IK1ODO ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] GPS Interference Question
At 15:44 30-09-11, Jason wrote: To filter out the L2 signal, would an actual GPS receiver have to be replaced / modified? Or would a more simple and cheaper alternative be to get a new antenna (with fancy filtering) to replace my existing roof-top antenna and expect all my old equipment to be happy? I think that a new antenna/filter/amplifier unit would be ok. But the problem is the installed base of receivers, including all those costly units used for geodesy or navigation, that have embedded antennas. Those will be hard to modify. 73 - Marco IK1ODO ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Happy 10th birthday, time-nuts
Tom, many thanks to you and John for starting and supporting this list. It is one of the best I know, with a very good S/N, and a lot of competent people. Honestly, I have no idea on how to improve it :-) - IMHO it is perfect as is. Marco IK1ODO ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Any thoughts on best rubidium?
At 15:55 26-09-11, you wrote: Hello, It is here: http://www.testequipmentplus.com/LCD85662H.html Regards, Javier But, as others pointed out in hp_agilent_equipment group, the replacement LCD lacks the resolution of the original vector-graphic CRT. Marco IK1ODO ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Best Cs in the world ?
Kurt Gibble, at Penn State, made major contributions to the field of primary frequency standards by developing models for the systematic effects within caesium fountain clocks, Szymaniec said. The uncertainties of those effects, now reduced several fold with the new models and numerical calculations provided by Gibble's group, have been verified at the National Physical Laboratory and also by the fountain clock group in Paris. Together with other improvements of the caesium fountain, these models and numerical calculations have improved the accuracy of the UK's caesium fountain clock , NPL-CsF2, by reducing the uncertainty to 2.3 x 10-16 -- the lowest value for any primary national standard so far. http://www.rfglobalnet.com/article.mvc/Atomic-Clock-With-The-Worlds-Best-Long-Term-0001?sectionCode=NewstemplateCode=SponsorHeaderuser=2164701source=nl:31736 73 - Marco IK1ODO ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Anyone know what this counter is?
I agree, it is very probably a Systron Donner 6053, 3 GHz, nixie. Specs and (bad) pictures scanned from the manual on my server in http://www.spinelectronics.eu/ftp/SD6053.pdf I bet it comes from some remains of John's Radio stock - I remember seeing many of them there, 15 years ago. 73 - Marco IK1ODO ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Dallas NV-SRAM replacement? (in 3458A)
Speaking of the 3458A, it has three DS1235Y-150 non volatile SRAM on the CPU board. Each is a 32K x 8 bit, so there is a lot of info inside. As the useful life of those is in the order of 10 years and most 3458A a re now 10 to 20 year old, is there a possible replacement? Possibly with a more modern component? Also, of course it would be a good idea to read and save the contents of the SRAMs before replacing, but... is any custom data in them that cannot be rewritten with a complete recalibration? Possibly this argument has been discussed before, but I don't remember. Marco IK1ODO ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Test - RYRYRY
At 08:32 01-06-10, you wrote: was that 45.45 or 50 Baud? Robert G8RPI. But it was not Baudot, by sure... :-) ZHC? ZRO? VVV DE IK1ODO TESTING ... ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] HP 104AR
Hi all, just got a very nice HP 104AR (1963 vintage) for my collection. It seems to work, but... anyone has a manual in PDF, ot at least a schematic ? 73 - Marco IK1ODO ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] HP 104AR
Hello Ulrich, of course the 103AR would be nice to have. My email should get it, but I agree that it would be better to send it to Didier's site. As you prefer... I'm QRV. About the messages to Rick four years ago, I found no replies. Does Rick still have the manuals? Rare things sitting on a shelf are a pity :-) The Agilent web site does not know what a 104AR was... :-D Marco IK1ODO ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] HP 104AR
At 18:33 19-04-10, you wrote: The 103AR manual is available for download at the to-way.com Web site under test Equipment Manuals--HP Had K7MLR Thanks! Just downloaded. Marco IK1ODO ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] One of the strangest clocks I have ever heard...
At 04.49 26/10/2009, you wrote: One of the strangest clocks I have ever heard... http://www.music.columbia.edu/~douglas/portfolio/sineclock/ . ciao _ Elio. Oh, well... :-| interesting! :-\ Marco IK1ODO ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] 58540A, anyone ?
Hi all, anyone here has an HP 54540A for sale? Answers to ik1...@spin-it.com 73 - Marco IK1ODO ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] RS XSD-2 - help needed
Hello, I got a broken RohdeSchwarz XSD-2 crystal oscillator module, type 283.6010.02 . By first, has anyone a schematic for it? Then, the dewar flask originally containing the oscillator mass is broken. Size was (approx) 65 mm internal diameter, 150 mm internal height. Who has similar dewars? The volume is close to 0.5 liters, and I have not found an useful replacement for common thermos flasks of that size. Any help appreciated! 73 - Marco IK1ODO / AI4YF ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] 10 MHz over optical fiber?
Hi all, I have to carry a 10 MHz standard frequency signal inside an EMC screened room via fiber optic cable. Not willing to re-invent the wheel, do something like an optical standard frequency link exist on the market? I think it is possible to use standard 100MB LAN transceivers, and POF. Phase noise requirements are not very stringent, and the distance is in the order of some tens of meters. Marco IK1ODO / AI4YF ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] 10 MHz over optical fiber?
At 16.41 24/11/2008, you wrote: Why fibre optic? You'll only need to convert back to copper when you get it in there (unless the kit that needs the 10Mhz reference has optical 10MHz in), and if you do that you may as well just take it in there using high quality coax (say RG-400U) and a bulkhead connector in the wall of the room. Dave Dave, the customer wants no bulkheads and asks specifically for an optical connection. The signal will be, of course, be converted back to electrical inside the room. Marco ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] 10 MHz over optical fiber?
Thanks to all for the quick answers and all the info. As usual, time-nuts is a great resource :-) Marco IK1ODO ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Using GPS for space-based instrument
At 09.37 11/11/2008, you wrote: Both Symmetricom and Frequency Electronics provide specialist space qualified products. It's not just a case of ruggedisation, but radiation hardening, g sensitivity which need to be designed in. Rob Kimberley Also, space qualified GPS must handle the larger doppler shifts due to the relative spacecraft velocity. A standard GPS will not work, it is necessary to modify the algorhytms. Karl, if you know nothing about GPS, possibly it's best to start reading a tutorial, like http://www.trimble.com/gps/index.shtml - the amount of information to digest before putting a GPS receiver on a spacecraft is huge. Marco ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Naive question on WWW stations
At 23.55 25/09/2008, you wrote: Hi Antonio, Ah yes I presume this is it ... Many thanks pf Yes, it is - WWV in Europe is usually quite weak, RWM is a strong signal. You will find the schedules and frequencies of all Russian time and frequency signals (including RWM and RID, Currently off the air due to budget cut ) at http://www.irkutsk.com/radio/tis.htm. 73 - Marco IK1ODO / AI4YF ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Re Frequency divider design critique request
At 05.10 11/07/2008, Bill wrote: What have you done with Life using modern computers? Er... not so modern, but... I wrote a Life program in Z80 assembler to exercise the emulator on an HP 64000A development system... it was in 1981 :-) Life was ideated by J.H. Conway in 1970. See http://en.wikipedia.org/wiki/Conway%27s_Game_of_Life . Fascinating (to me) as it was 27 years ago. Sorry for the OT! 73 - Marco IK1ODO / AI4YF ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] WIRED Time Nuts
At 08.20 11/12/2007, you wrote: Hi John Rick, Looks like Quinn's WIRED magazine time-nuts article was just released... Very nice article. A lot of mad guys out there :-) ! 73 - Marco IK1ODO / AI4YF ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Austron 2000C on EBay
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Don, What is the frequency source in this unit? Regards... Don None. It could discipline an external oscillator (a 1250A, I presume). Have two of them on the shelf, anyone in EU interested to play with? They were working well on the Russian Chajka chain. 73 - Marco IK1ODO / AI4YF ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] E1938s
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY At 04.17 28/08/2007, you wrote: Just got mine and Marco Bruno's E1938s in today's mail. Marco: it'll go out tomorrow, unless you'd like to wait until I can run an ADEV plot on them both. Let me know. No hurry, I'm leaving for a couple of weeks, so take your time and test it. I'm curious too. Marco IK1ODO ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] 5 MHz from 10 MHz
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] At 14.01 23/07/2007, you wrote: ); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] No point using an expensive divider with an 8640B. The close-in noise is dominated by the cavity, especially at the bandwidths used by their lock mechanism, and the broadband floor is ECL at ~-150 dBc/Hz. Just stick a 74xxx74 in there (what *is* considered to be the lowest-noise modern TTL family, anyway?) -- john, KE5FX I used 74ABT logic (Philips, see Digikey) with good success up to over 200MHz clock, driven by SN65LVDS34 as squarer, with good success (it is an SDR QSD mixer, and had much less noise than using 74-shottky series). No jitter data measured, however. I think that the same circuit - or even a much simpler one - would be perfect to drive an 8640B. A 74AC74 would be just fine at 10 MHz. Metrology-grade dividers are another thing, of course. The schematic of my front-end is at http://www.spin-it.com/sdr/ik1odo_sdr1.html - use only what needed, of course :-) 73 - Marco IK1ODO - AI4YF ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Ebay 5071A scam back again?
At 14.06 26/06/2007, Poul wrote: Never buy anything from a userid that has zero feedback. ... and, in particular, if he registered to ebay just the same day! 73 - Marco IK1ODO / AI4YF ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
