Re: [time-nuts] Frequency doubler 5/10 and distribution amplifier for Lucent KS-24361
It is possible to convert Altium files to Kicad https://github.com/thesourcerer8/altium2kicad/ This might also work, but Altium seems to be a work in progress https://github.com/upverter/schematic-file-converter Andy ◉ Bardagjy.com ◉ +1-404-964-1641 On Apr 5, 2015, at 8:08 AM, John Allen j...@pcsupportsolutions.com wrote: Hi Time-Nuts - FWIW, the is a 30 day free trial of Altium Designer at http://www.altium.com/free-trial?gclid=CKnpkaux38QCFQotaQodoaYAWQ The download requires a company name and email address. I for one, would like at least one of each of Gerhard's boards. Would anybody like to volunteer to create 10-20 boards and sell them? If people are interested in boards, they can pm me at j...@pcsupportsolutions.com And I will make a list and post it. In your email, provide your name and email address and how many multiplier boards and how many low noise 220pV/sqrtHz preamp boards? I have no time to do any more than that. Is this worth being a TAPR project? Trying to help, John K1AE j...@pcsupportsolutions.com -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Anthony Roby Sent: Saturday, April 04, 2015 10:12 PM To: g...@hoffmann-hochfrequenz.de; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Frequency doubler 5/10 and distribution amplifier for Lucent KS-24361 Gerhard - I would like to make the board if you could make the layout available. I don't have Altium, so would need the artwork to be able to toner transfer the board. Is it available? Thanks -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Gerhard Hoffmann Sent: Saturday, April 04, 2015 7:19 AM To: time-nuts@febo.com Subject: Re: [time-nuts] Frequency doubler 5/10 and distribution amplifier for Lucent KS-24361 Am 03.04.2015 um 04:04 schrieb Philip Gladstone: I'm coming late to this thread from January -- but did anybody ever make the PCBs for Gerhard's 10MHz output board? I'm interested. I just got my pair of RFTG's. Congratulations! There isn't a lot of news.. The interest on the net quickly boiled down, my sample works and so there was not a great incentive to follow that with much energy. And getting boards out does not mean that those are really built or that there is any feedback at all, as I saw with my 220pV/sqrtHz preamp. The Altium Designer files are available, maybe the regulators should be changed to sth. bigger (TO220 with small heat sink or so) regards, Gerhard (who will spend this rainycold Easter weekend on a 1pps generator whose outputs can be skewed in ps-steps to check the linearity of T2D converters or time stretchers.) ___ 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 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. --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com ___ 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 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] OXCO insulation
Fiberglass seems like an obvious choice for high temperature insulation. Andy ◉ Bardagjy.com ◉ +1-404-964-1641 On Feb 23, 2015, at 12:51 AM, Dr. David Kirkby (Kirkby Microwave Ltd) drkir...@kirkbymicrowave.co.uk wrote: On 22 Feb 2015 22:07, Dave M dgmin...@mediacombb.net wrote: Yes, I'm aware that the newer OXCOs don't have any insulation other than air inside the package. I failed to mention that in my post. I am primarily interested in the older OXCOs that have foam insulation inside. I have a couple of them, including the crystal oven from an old HP 5245L counter that needs new insulation. I don't know what is used, but clearly whatever is used *must* be stable under heat for *long* periods of time. Domestic gas / oil / coal boilers must use insulation, and whatever is used would I assume be able to take heat for extended periods of time. I wonder if you could get something like that. The trouble I see with other chemicals (spray foam etc), is you have no idea if it will sustain heat for long periods of time. Dave. ___ 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 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] Mechanical 1PPS Oscillator Disciplining
From a fascinating (albeit long) article about transatlantic communication cables http://archive.wired.com/wired/archive/4.12/ffglass.html On the bottom of page 45 to the top of page 46 Each piece of equipment on this tabletop is built around a motor that turns over at the same precise frequency. None of it would work - no device could communicate with any other device - unless all of those motors were spinning in lockstep with one another. The transmitter, regenerator/retransmitter, and printer all had to be in sync even though they were thousands of miles apart. This feat is achieved by means of a collection of extremely precise analog machinery. The heart of the system is another polished box that contains a vibrating reed, electromagnetically driven, thrumming along at 30 cycles per second, generating the clock pulses that keep all the other machines turning over at the right pace. The reed is as precise as such a thing can be, but over time it is bound to drift and get out of sync with the other vibrating reeds in the other stations. In order to control this tendency, a pair of identical pendulum clocks hang next to each other on the wall above. These clocks feed steady, one-second timing pulses into the box housing the reed. The reed, in turn, is driving a motor that is geared so that it should turn over at one revolution per second, generating a pulse with each revolution. If the frequency of the reed's vibration begins to drift, the motor's speed will drift along with it, and the pulse will come a bit too early or a bit too late. But these pulses are being compared with the steady one-second pulses generated by the double pendulum clock, and any difference between them is detected by a feedback system that can slightly speed up or slow down the vibration of the reed in order to correct the error. The result is a clock so steady that once one of them is set up in, say, London, and another is set up in, say, Cape Town, the machinery in those two cities will remain synched with each other indefinitely. Does anyone know any other history about that particular piece of equipment? Cheers! Andy ◉ Bardagjy.com ◉ +1-404-964-1641 ___ 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-58503A
Sounds like the GPS receiver is hosed. I think there are two different receivers used in the 58503a, unfortunately I'm away from my lab, otherwise I could check mine. It is a standard part, and may be available on the surplus market. Before replacing, I'd check the usual suspects, power supply health (look for failed electrolytics) and re-seat the gps board to board connector. Happy to measure things on my 58503a. Andy ◉ Bardagjy.com ◉ +1-404-964-1641 On Dec 30, 2014, at 12:35 PM, Richard Thorpe kisso...@gmail.com wrote: This list was recommended to me by the elecraft list. I have an HP-58503A sat disciplined “clock” that puts out a steady 10MHz to my K3 radio. Its been working 24/7 for years, I monitor it with David Anderson's Mac GPS Control X software on my iMac. Several days ago error messages showed up i.e.: Health- err, Self Test-err, Int Power- OK, OCXO- OK, EFC-OK GPS RCV-err. Its not tracking any sats and now I cannot event communicate with it at all even with a simple com program. Is there anyone out therE who can fix these things? Any suggestions would be appreciated. Thank you. Richard Thorpe K6CG ___ 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 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] Have some Leica/AeroAntenna Tech Inc Choke Ring antennas for sale
Hi Pete, I'd like to tentatively speak for one. Thanks! Andy ◉ Bardagjy.com ◉ +1-404-964-1641 On Sep 13, 2014, at 5:13 PM, Pete Lancashire p...@petelancashire.com wrote: Forgot .. I'm in Portland, Oregon 97217 -pete On Sat, Sep 13, 2014 at 5:00 PM, Pete Lancashire p...@petelancashire.com wrote: I've acquired a few new in the box Leica/AeroAntennas. Some boxes have been opened. https://plus.google.com/u/0/photos/111617808980322733757/albums/6052074218781475313 The complete assemble is Leica P/N 10147 The 'puck' antenna is P/N 10160 I would like to have Time-Nuts get first dibs Does $100 + shipping sound reasonable ? The box is 16 x 16 x 16 and weighs 11 lbs. -pete ___ 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 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 man's noise is another man's signal...
One of my favorite alternate GPS applications is using the visibility of the satellites like tomographic beams to reconstruct the 3D geometry of buildings http://www.kihwan23.com/papers/ISWC08/GPSRAY_ISWC08_short_final.pdf Andy Bardagjy bardagjy.com On Aug 14, 2014, at 5:18 AM, Collins, Graham coll...@navcanada.ca wrote: This is an interesting use of GPS, I had never considered the Aurora or solar storm angle before. However, I am aware of the use of ionospheric scintillation and TEC measurements for ionospheric research and also for the study and detection of earthquakes. Canadian High Arctic Ionospheric Network (CHAIN) uses this technology http://chain.physics.unb.ca/chain/pages/gps/ and a couple of links about the earthquake angel: http://demeter.cnrs-orleans.fr/dmt/doc/workshop2011/10_Vishal_Chauhan.pdf http://demeter.cnrs-orleans.fr/dmt/doc/workshop2011/12_O.P.%20Singh_Agra.pdf I have been pondering how I could use as is or modify one of my GPS receivers to make these sorts of measurements. The CHAIN gps receivers use a OCXO but haven't figured out how to apply that to one of the GPS receivers I currently have or even if I could. I have also been pondering whether I could approach from a different angle by using the range correction values provided Differential GPS (DGPS) radio beacons which broadcast range correction values for use with DGPS capable receivers. Seems to me that the Ionospheric effects on the GPS signal is reflected in the range correction values and it should be a matter of working backwards. Cheers, Graham ve3gtc -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Hal Murray Sent: August-14-14 4:32 AM To: time-nuts@febo.com Cc: Hal Murray Subject: [time-nuts] One man's noise is another man's signal... Tue evening, I went to a talk on Auroras and Solar Storms. It was targeted as the general public so they didn't get into any technical details. One of the pictures showed a GPS setup. They were using it to measure free electrons in the ionosphere. A friend found this in case anybody wants gory details: http://www.navipedia.net/index.php/Ionospheric_Delay -- These are my opinions. I hate spam. ___ 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. This electronic message, as well as any transmitted files included in the electronic message, may contain privileged or confidential information and is intended solely for the use of the individual(s) or entity to which it is addressed. If you have received this electronic message in error please notify the sender immediately and delete the electronic message. Any unauthorized copying, disclosure or distribution of the electronic message is strictly forbidden. NAV CANADA accepts no liability for any damage caused by any virus and/or other malicious code transmitted by this electronic communication. Le présent message électronique et tout fichier qui peut y être joint peuvent contenir des renseignements privilégiés ou confidentiels destinés à l’usage exclusif des personnes ou des organismes à qui ils s’adressent. Si vous avez reçu ce message électronique par erreur, veuillez en informer l’expéditeur immédiatement et supprimez le. Toute reproduction, divulgation ou distribution du présent message électronique est strictement interdite. NAV CANADA n’assume aucune responsabilité en cas de dommage causé par tout virus ou autre programme malveillant transmis par ce message électronique. ___ 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 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] optically excite a quartz crystal?
When this question was first posed, AOM's first jumped to my mind. An AOM (sometimes AOD) is an Acousto-Optic Modulator that works by setting up an acoustic wave in a crystal. When a laser is directed through (or reflected by) an AOM, it is deflected. One way to think about this is the crystal lattice deforms with the period of the acoustic wave. The lattice deformations form a grating of regions of varying indices of refraction which produce varying phase delay. This steers the beam just as a grating would. Another way of thinking about it is the 'phonon's' momentum and the photon's momentum add producing a deflection (like two billiard balls colliding). This might seem impossible, but the math works out exactly.. Another nice thing is, if you recall, the EM field produced in the far-field of a coherent EM wave impinging on a grating is the Fourier Transform of the grating itself. In something like a CD, the grating has hard edges, producing lots of harmonic content. AOMs look like sine waves, most of the energy ends up in the deflected beam. AOMs are often constructed using quartz crystals because they are fairly broadband (optically) and piezoelectric. The piezoelectric properties make it easy to set up the acoustic wave in the crystal. The key difference is, AOMs are typically designed to absorb as little power as possible (power absorption is their primary failure mechanism). Depending on your laser, you might want to find an AOM that is less transparent in your excitation regime. That said, you can get a lot of energy out of lasers these days. Megawatt pulses are not impossible with something like a Kerr-lens mode locked laser. This results in extremely high electric fields (MW pulse in 0.1 mm^2). Andy Bardagjy bardagjy.com On Apr 21, 2014, at 6:47 AM, Magnus Danielson mag...@rubidium.dyndns.org wrote: On 04/21/2014 03:18 PM, Attila Kinali wrote: On Mon, 21 Apr 2014 14:54:12 +0200 Magnus Danielson mag...@rubidium.dyndns.org wrote: They used a 10mW HeNe laser, modulated with 1kHz to 1MHz on various quartz cuts (X+5°, DT, AT) and could measure oscillations of the quartz using metal electrodes. The mechanism of exitation was photothermal 10 mW laser is reasonable. What levels of signal where they getting? 6.2mV, with an real laser incident power of 5mW (the AOM ate half of the power) Cool. Today we use semiconductor lasers that we can modulate directly, so no need for the AOM on the NeHe laser. Cheers, Magnus ___ 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 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] Making a Raspberry Pi NTP server without soldering
The networking adapter on the Pi is connected to the SoC via USB while on the BeagleBone the MAC is native. I suspect this might affect timing. Andy Bardagjy bardagjy.com On Tue, Oct 22, 2013 at 11:36 AM, Chris Albertson albertson.ch...@gmail.com wrote: On Tue, Oct 22, 2013 at 7:13 AM, Collins, Graham coll...@navcanada.ca wrote: How you done anything with or have compared the PI to the Beaglebone Black? If your only use of the device is to have an NTP server then why pay more for the Beaglebone? The Pi based server seems to be better than required. better in this case meaning that it keeps time better then it can transfer it over your network. If you need a lower cost Linux server, you can repurpose a PogoPlug. These are roughly the same specs ARM process and a little bit of RAM but come with a case and power supply all for under $20. You can re-flash them with a general purpose Linix-ARM distribution. But no good place to attach a PPS input except for using a USB-Serial dongle. Well there is a serial port header inside the box but I've not tried it. Chris Albertson Redondo Beach, California ___ 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 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] Article on linear regulator noise reduction methods
Worth also reading the very good (cited) article from Wenzel http://www.wenzel.com/documents/finesse.html Andy Bardagjy bardagjy.com On Thu, Oct 17, 2013 at 11:24 AM, Robert LaJeunesse rlajeune...@sbcglobal.net wrote: FYI. Addresses LM317 noise in a simple implementation, how to reduce it, and how it relates to other approaches and parts. Numerous graphs of noise voltage versus frequency can prove enlightening. http://www.edn.com/Home/PrintView?contentItemId=4422750 ___ 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 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] Low cost GPS for model aircraft
There are quite a few off the shelf model aircraft controllers. As you can imagine, those based on GPS and/or MEMS IMUs are not terrifically high performing. That said, I have seen very promising results from thermopile based systems - good discussion in the link below http://paparazzi.enac.fr/wiki/Sensors/IR They do tend to break down on overcast or cloudy days when the contrast between the sky and the ground is minimal. Andy Bardagjy bardagjy.com On Mon, Aug 5, 2013 at 10:14 AM, J. Forster j...@quikus.com wrote: This chatter about model aircraft GPS got me to wondering if there now off-the-shelf flight control systems for model planes that will do nav and/or attitude control? I know there are mini-gyros, but I think they are only good enough for attitude control. Last time I was into this, if you lost radio contact the model was gone or had crashed.. -John ___ 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 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] Lead acid battery noise levels
The SRS 560 and 570, low noise voltage and current preamplifiers respectively, both use bog standard sealed lead acid batteries. Andy Bardagjy bardagjy.com On Tue, Jul 9, 2013 at 9:26 AM, J. Forster j...@quikus.com wrote: EGG Princeton Applied Research made a very low noise preamp unit, the 113, which was pretty much the industry leader for years. It was often used with Lock-In amplifiers. The unit used NiCds, I believe for that, among other, reasons. I'd expect Ithaco and SAE have similar products. -John === David Kirkby wrote: On 9 July 2013 04:52, Mark Spencermspencer12...@yahoo.ca wrote: Hello, I've just reviewed the thread from earlier this year regarding low noise power supplies and some related information about the noise levels of certain batteries.Has anyone ever come across any data pertaining to the noise levels of common gelled lead acid storage batteries ? Have you come across the volt-nuts list? https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts I see a bizzare review of an HP 3457A meter on utube http://www.youtube.com/watch?v=HfxpJCdgVwc where the guy determines the noise level of the 6.5/7.5 digit meter by measuring the voltage of what he describes as a general purpose lab power supply. Is it me, or is it a bit dumb to try to measure the noise level of a laboratory multimeter by using a general purpose lab power supply. I must admit, I thought that using a battery would have been stable at least short term, but it seems there is noise on a battery - something I was not aware of until today. Dave ___ 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. A battery is noisest when current is flowing in the battery. With no current flow (or electrolyte disturbance) the noise is very low. NIST has measured the noise of unloaded NiCd cells for example and it is extremely low. Bruce ___ 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 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 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] Very stable synthesizer, alternative to PTS(Programmed Test Sources) x10 or 040?
I've had my eye on the Stanford Research SG 380 for some time - they boast -116dBc/Hz phase noise http://thinksrs.com/products/SG380.htm They use a pretty interesting rational approximation frequency synthesis which they discuss in detail in their operating manual. This allows them to drive down the phase noise. Too bad it's nearly $4000... Andy Bardagjy bardagjy.com On Mon, Jul 8, 2013 at 10:55 AM, Ed Palmer ed_pal...@sasktel.net wrote: In 2002, this document: THE CRYSTAL OSCILLATOR CHARACTERIZATION FACILITY AT THE AEROSPACE CORPORATION http://www.pttimeeting.org/**archivemeetings/2002papers/**paper32.pdfhttp://www.pttimeeting.org/archivemeetings/2002papers/paper32.pdf stated: The Programmed Test Sources, Inc. PTS model #250M6NIGSX-51 low-noise frequency synthesizer is used to offset the frequency reference to obtain the desired beat frequency. In our previous system, we used a Fluke 6160B frequency synthesizer, since the Fluke 6160B frequency synthesizer had the lowest noise contribution of all the frequency synthesizers on the market at that time. The reason for having the low-noise frequency synthesizer is the synthesizer noise contributions to the system noise-floor. Unfortunately, Fluke has discontinued manufacturing and maintaining this synthesizer. Therefore, we looked at the new synthesizers on the market and found that the PTS synthesizer was the closest to the Fluke 6160B frequency synthesizer in terms of noise floor. Sounds like a working 6160B would be a nice thing to have. Unfortunately, it's too large for my already overcrowded lab. :-( Ed On 7/8/2013 3:44 AM, Anders Time wrote: I have been looking around for a very stable synthesizer(E-12 at 1s adev). The only really good information that I have found is febo.com´s measurements on the PTS synthesizers(http://www.febo.** com/pages/pts_synth/ http://www.febo.com/pages/pts_synth/). Is there any other really good alternatives to the PTS synthesizers? DDS? HP? Best Regards Anders __**_ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/** mailman/listinfo/time-nutshttps://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ 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] Cheap 9.8Mhz Sa.22c's
Bob, are you referring to a particular GPSDO (for $120)? Which is it? Can you provide a link? Andy Bardagjy bardagjy.com On Sun, Jun 2, 2013 at 4:30 PM, Bob Camp li...@rtty.us wrote: Hi Far cheaper to spend the $120 on the GPSDO that does the 9.8304 to 10 MHz conversion than to send the Rb back to the factory. Bob On Jun 2, 2013, at 4:24 PM, Ed Palmer ed_pal...@sasktel.net wrote: Glutton for punishment, aren't you Mark! :) There's probably no way to get to 10 MHz. I have two of these that I picked up just to play with. Another purchaser contacted Symmetricom and actually got some information out of them. The oscillator in these runs at 58.9824 MHz. The default output is 9.8304 MHz. The output can be changed, but only in submultiples of the 58.98 MHz. e.g. 58.98 divided by 6 equals 9.8304. You can change the '6' to various integers as documented in the manual. To move the output to 10 MHz you'd have to change the crystal back to the standard 60 MHz so that you could divide it by 6. But then you'd mess up the multiplier that takes the crystal frequency up to the Rb frequency. You'd have to change the synthesizer that controls that side of the system. There's no way to tell if that would require a completely new firmware load or if, just maybe, there could be an undocumented (maybe protected) command to modify it. You might be able to send it back to Symmetricom to get it changed but, based on my experience, you couldn't afford it. Ed On 6/2/2013 11:52 AM, Mark C. Stephens wrote: These are 9.8304Mhz, is possible to move them to 10Mhz? http://www.ebay.com/itm/Symmetricom-SA-22c-9-8304MHz-Precision-Rubidium-Oscillator-5V-and-15V-NICE-/261223397404 -marki Kind Regards, Mark Stephens Mark Clemens Stephens | Customer service engineer | Non-Stop Computer Ltd * +61 2 9011 8186 | ( +61 428 256 334 | * ma...@non-stop.com.aumailto: ma...@non-stop.com.au Non-Stop Computer PTY LTD 79 Devon St North Epping NSW 2121 Australia Timezone: AEST (UTC +10) Email: serv...@non-stop.com.aumailto:serv...@non-stop.com.au ___ 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 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 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] Net4501's cheap...
The net4501s went way up in price, but there is a seller offering a lot of five net4521 boards plus five 64MB CF cards for $80 - and he is willing to accept less if you make an offer. Try lot 320744604969. They seem to be the same as a net4501 but with two PCMCIA slots. I was gonna try to run NTPd on it for a work project, though I've also got a few BeagleBone Blacks hanging around. Andy Bardagjy bardagjy.com On Thu, May 23, 2013 at 1:14 AM, mike cook mc235...@gmail.com wrote: Le 23 mai 2013 à 03:31, Jim Sanford a écrit : Do you have any documentation on how to use them? I have one that I bought to be an internet access point with a verizon card, failed due to verizon not complying with the RFCs. Love the device, but no information on ports, etc. Might want to play with it, or could make it available. User manuals, firmware etc from the Soekris.com site and there is plenty of OS installation/admin doc visible on the web. They marry with PCI or mini-PCI wifi cards that can be found cheaply. Mine were running FreeBSD but there are other flavors that support it. I say were because their power supplies failed after around 5years 24/24. The 4801s of the same vintage are still going. ___ 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 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] Time Nut Pickens at the MIT Flea ?
Plenty of good stuff in the area; Flour, Area Four, Catalyst, Friendly Toast, Blue Room, CBC, and so on. I live in the area - recent MIT graduate - and would be happy to set something up (though I think my gf's birthday is that day, so maybe not) Andy Bardagjy bardagjy.com On Mon, May 20, 2013 at 8:34 AM, J. Forster j...@quikus.com wrote: There are cafe/pizza options in the Strattion Student Center, although seating is somewhat limited. But there are other places in the same building. It's a short walk from the flea site (Mass Ave at Vasser Street) Bldg W-20 -John I was there as well, but did not see much of interest. That might be because Paul Swed scooped up the good stuff before I could finish the first pass :) Nice find Paul, hope they settle down for you. Would love to see a post-flea get together and put some faces with names, but I don't know of any places nearby. Paul - K9MR On May 19, 2013, at 10:22 PM, paul swed wrote: Good news at least the first EGG RB fired up and after adjusting the synthesizer is locked very nicely. Letting it bake and figuring out the dip switches. They were wrong or purposely offset. Hard to say. Lamp voltage is 12 VDC I suspect thats quite a good number if compared to the old FRS and FRCs I have down in the 5-6V range. The FRS/C run 12 new. Can't really find any documentation, but expected that. Regards Paul WB8TSL On Sun, May 19, 2013 at 10:09 PM, Bob Bownes bow...@gmail.com wrote: We should plan a Time-Nuts BOF lunch after the next flea. Saw little TN gear @ Dayton save one Efretom RBI time base for $1800 and a few 10811s of dubious quality for $50 ea. the dents put me off gambling on one since I was given or the afternoon before! ;) On May 19, 2013, at 21:50, paul swed paulsw...@gmail.com wrote: ___ 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 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 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] 10Mhz Sine from Square Wave Synthesizer
Alright, so it seems that it's possible the Symmetricom SA.22c that I've got might be set to 9.8304MHz. That may be programmable to 10MHz, but it might require a DDS otherwise. Nevertheless, if the oscillator is set to 10MHz it seems the consensus is to construct a LPF. Luciano, thank you for sharing your design, did you wind your own inductors? Odd values.. Typically when designing filters I start by fixing the inductor values and work backwards... John, thanks for your input, you reminded me that LFP performance often depends on source impedance. To the MMIC amplifier, you'd be amazed what you can do with an opamp these days. I was amazed reading the datasheet for the LTC6409 a 10GHz GBW, 1.1nV/sqrt(hz) fully differential opamp. With a gain of one, the frequency response is totally flat out to 1GHz. http://cds.linear.com/docs/en/datasheet/6409fa.pdf Perhaps something like a LT6600-15 might be a complete solution for me - it's a fully differential amplifier with a 15Mhz 4 pole LPF. http://www.linear.com/product/LT6600-15 Thanks for your input, I'll be sure to keep everyone posted on my project's progress. Andy Bardagjy bardagjy.com On Mon, May 20, 2013 at 12:03 PM, Luciano Paramithiotti timeok...@gmail.com wrote: Hi Andy, The simplest way is to use a low pass filter with a notch capability for the second and third harmonics. You can find the schematic and response for 5 and 10 MHz here: http://www.timeok.it/files/5_and_10mhz_low_pass_notch_filter.pdf ciao, Luciano timeok see: www.timeok.it On Mon, May 20, 2013 at 1:30 AM, Andy Bardagjy a...@bardagjy.com wrote: Hi folks, I recently picked up a Symmetricom SA.22c rubidium oscillator. According to the datasheet, it outputs a square wave with programmable frequency (well you can pick among some set of frequencies). I'd like to build up a small circuit locked to the square wave output which outputs a 10MHz sine wave for use as my house clock for my various instruments (spec an, counter etc). I of course could distribute the square wave, but am concerned about harmonics, among other things. The FE-5680A uses a AD9830A DDS to synthesize its output. Is a DDS the right way to go - in terms of performance, phase noise and so on? I suppose I could do this with a tank or some other analog circuit, but.. Andy Bardagjy bardagjy.com ___ 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. -- Luciano Timeok visit : www.timeok.it ___ 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 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] Time Nut Pickens at the MIT Flea ?
I grabbed a real nice Leitech distribution amplifier - but I took it home and it was empty! I walked back and returned it for a refund, but the seller said he had a whole stack in his office. I was gonna post to the list when I sort it out - it was a real bargin, and he said he might be willing to ship them around. Andy Bardagjy bardagjy.com On Sun, May 19, 2013 at 4:42 PM, Stan, W1LE stanw...@verizon.net wrote: Anyone got any Time Nut quality items at the MIT fleamarket today ? Stan, W1LE Cape Cod __**_ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/** mailman/listinfo/time-nutshttps://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ 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] 10Mhz Sine from Square Wave Synthesizer
Hi folks, I recently picked up a Symmetricom SA.22c rubidium oscillator. According to the datasheet, it outputs a square wave with programmable frequency (well you can pick among some set of frequencies). I'd like to build up a small circuit locked to the square wave output which outputs a 10MHz sine wave for use as my house clock for my various instruments (spec an, counter etc). I of course could distribute the square wave, but am concerned about harmonics, among other things. The FE-5680A uses a AD9830A DDS to synthesize its output. Is a DDS the right way to go - in terms of performance, phase noise and so on? I suppose I could do this with a tank or some other analog circuit, but.. Andy Bardagjy bardagjy.com ___ 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.
