Re: [time-nuts] Trimble/Nortel 45000 GPS Locked Reference Oscillatorboard
Dave, my opinion is that this big tree around your GPS antenna causing a lot of trouble as especially when the tree are wet... Rgds Ernie. -Original Message- From: quartz55 quart...@hughes.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Tue, Dec 24, 2013 4:10 pm Subject: Re: [time-nuts] Trimble/Nortel 45000 GPS Locked Reference Oscillatorboard That Nortel board you have there looks exactly like the board I got in my Nortel TBW50AA GPSTM. You can find the book on-line, look for Dual Voltage Global ositioning System Timing Module (GPSTM) OEM General Specification. Yes the ower supply is speced from 24 to 48VDC plus or minus. They don't specify AC, ut since the bridge is there it will work. 2.08A warm up and .6A@36VDC steady tate. I'd like to see some of your LH traces if you don't mind, especially the osc race. I don't seem to be able to get my osc trace less than ~400 ppt/div. You an see pics of my unit and traces from LH here http://s251.photobucket.com/user/DogTi/library/time?sort=3page=1 Dave __ ime-nuts mailing list -- time-nuts@febo.com o unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts nd 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] No E-mails
Hi, seems to me that the server is OK but minimum activity from the people. Rgds Ernie. -Original Message- From: dzorbini dzorb...@netscape.net To: time-nuts time-nuts@febo.com Sent: Thu, Dec 19, 2013 7:19 pm Subject: [time-nuts] No E-mails Hello: haven't received any messages for your site past few days, I've been eading all the comments and questions for years now nothing. __ ime-nuts mailing list -- time-nuts@febo.com o unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts nd 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] Off-Topic Question -- German Composition Resistors
Hi Bruce, try to use this one Resistor Color Code Identification Rgds Ernie. -Original Message- From: Brucekareen brucekar...@aol.com To: time-nuts time-nuts@febo.com Sent: Thu, Nov 21, 2013 7:17 pm Subject: [time-nuts] Off-Topic Question -- German Composition Resistors While tracing out a PC board from an instrument manufactured in Germany, I uickly discovered the color code on 1/4-watt composition resistors is not he same as that commonly used in the US For example, I would measure bout 10,000-ohms across a presumably good resistor that appeared to be marked 700-ohms. Has/does Germany used a different code for such parts? ruce, KG6OJI __ ime-nuts mailing list -- time-nuts@febo.com o unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts nd 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] Off-Topic Question -- German Composition Resistors
Hi Bruce, sorry but the server removed the embedded pics. here is a link http://www.diyaudioandvideo.com/Electronics/Color/ Rgds Ernie. -Original Message- From: Brucekareen brucekar...@aol.com To: time-nuts time-nuts@febo.com Sent: Thu, Nov 21, 2013 7:17 pm Subject: [time-nuts] Off-Topic Question -- German Composition Resistors While tracing out a PC board from an instrument manufactured in Germany, I uickly discovered the color code on 1/4-watt composition resistors is not he same as that commonly used in the US For example, I would measure bout 10,000-ohms across a presumably good resistor that appeared to be marked 700-ohms. Has/does Germany used a different code for such parts? ruce, KG6OJI __ ime-nuts mailing list -- time-nuts@febo.com o unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts nd 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] GPS with 10KHz output
Bob, please have a look to the flwng link. about the stability.. http://www.jrmiller.demon.co.uk/projects/ministd/stab.htm Rgds Ernie. -Original Message- From: Bob Camp li...@rtty.us To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Thu, Sep 19, 2013 1:21 pm Subject: Re: [time-nuts] GPS with 10KHz output Hi It's not the best thing to use. Since the 10 KHz jumps once a second, it's not eally very useful. The GPS it's self is not as well optimized for timing pplications as a UT or a LEA-(any number) T. At auction prices, the GPS isn't oing to be the major cost item in your GPSDO. Better to get a good one. Bob On Sep 18, 2013, at 10:21 PM, Bill Reed br...@otelco.net wrote: Hi, Does anyone know the suitability of this module for GPSDO ? I am new to the group. Thanks, Bill R http://www.ebay.com/itm/Navman-jupiter-T-Tu60-GPS-Kit-1pps-10khz-GPS-Module-/260790984470?pt=US_Ham_Radio_Amplifiershash=item3cb85a9f16 ___ 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. ___ ime-nuts mailing list -- time-nuts@febo.com o unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts nd 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] Thunderbolt Monitor
Hi Götz, very nice handy project, just to watch the TB without a PC. You should have as a KIT . Best regards, Ernie. -Original Message- From: Götz Romahn go...@g-romahn.de To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Fri, Aug 23, 2013 6:52 pm Subject: Re: [time-nuts] Thunderbolt Monitor hallo all, f you are a notorious DIYer, have some soldering skills and know how to rogram an ATmega8515 microprocessor, have a look at: ttp://www.g-romahn.de/tbolt2lcd/index.htm or a simple small Thunderbolt monitor heers Götz Am 17.08.2013 17:53, : This is a repost with a new thread. Sorry for the bandwidth. Looking at the high price (and closed software) of what is currently offered, have been thinking of making a kit of my GPSMonitor (see KO4BB.com) I think I could sell an assembled and tested kit with a 2x16 char display for 60 or so if I get 50 people interested. This will use a professionally made PWB with surface mounted components. Of course, the source code is free. You do not have to buy anything from me. ou can build your own using info on my web site. If anyone is interested, send me a private message. Didier KO4BB ___ ime-nuts mailing list -- time-nuts@febo.com o unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts nd 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] Connector For Trimble/Nortel GPSTM (NTGS50AA) ?
Hi Fred, there is only a 48Volt connection and some unknown data com I did not use any mating connector just the power in... everything is available on the front plate. Rgds Ernie. -Original Message- From: Frederick Bray fwb...@mminternet.com To: time-nuts time-nuts@febo.com Sent: Mon, Jun 3, 2013 7:40 am Subject: [time-nuts] Connector For Trimble/Nortel GPSTM (NTGS50AA) ? Several months ago, I picked up one of the Trimble/Nortel GPSTM NTGS50AA) boards. I am trying to find a part number for the mate to he 110 pin Z pack connector. It looks like Digikey part no. A97846-ND ight do the trick. Has anyone identified the correct connector. Thanks. Fred Bray __ ime-nuts mailing list -- time-nuts@febo.com o unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts nd 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] RTS
If you connect to this server../ Internet / and the second RS232 output from your PC is connected to your GPS receiver then it shows as DGPS mode. for the GPS unit.but not very simple... I used it several years ago.. before the WAAS was not fully activated..it improoves the location of your GPS unit..also could not justify if my GPSDO got a better stability.. Rgds Ernie. . -Original Message- From: Jim Lux jim...@earthlink.net To: time-nuts time-nuts@febo.com Sent: Thu, Apr 4, 2013 3:50 pm Subject: Re: [time-nuts] RTS On 4/3/13 11:32 PM, gary wrote: Can anyone translate this to English. OK, it is English, but you know what I mean. It is supposed to be some new time service. http://rts.igs.org/access/ Not exactly time service.. this is one of the entry points to do high erformance GPS geodesy. Of course, to know what time it is, you need to now where you are. http://igs.org/faqs.html ee also ttps://gipsy-oasis.jpl.nasa.gov/ Here's where they put the very precise orbit and clock error estimates ttps://gipsy-oasis.jpl.nasa.gov/index.php?page=data We also have this ttp://www.gdgps.net/ __ ime-nuts mailing list -- time-nuts@febo.com o unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts nd 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] Trimble TB PCB board gpsdo question
Hi, anybody has the Trimble Thunderbolt GPSDO but in a letter size PCB board from the Hong-Kong epay seller It has a SMC socket and beside the normal 10 MHz output it has a second frequency output 9,830400 MHz. What is the purpose for this freq in the GSM base station... Please contact me offline to exchange some experience, data. Many thanks and best regards Ernie. ___ 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] Trimble TB PCB board gpsdo question
Hi Mike, Thanks a lot for the info, Rgds Ernie -Original Message- From: Mike S mi...@flatsurface.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Fri, Jan 25, 2013 3:11 pm Subject: Re: [time-nuts] Trimble TB PCB board gpsdo question On 1/25/2013 9:00 AM, Erno Peres wrote: it has a second frequency output 9,830400 MHz. What is the purpose for this freq in the GSM base station... None that I can think of. But it is 8 times the CDMA chip rate of 1.2288 Hz, so would be useful in a CDMA base station. ___ ime-nuts mailing list -- time-nuts@febo.com o unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts nd 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] Z3801A trouble
it could be also that the pover supply drops the voltage under nominal load... looks Ok with no load -Original Message- From: J. L. Trantham jlt...@att.net To: 'Discussion of precise time and frequency measurement' time-nuts@febo.com Sent: Sun, Jan 13, 2013 1:50 pm Subject: Re: [time-nuts] Z3801A trouble I believe it was Murphy. Joe -Original Message- rom: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On ehalf Of Joseph Gray ent: Sunday, January 13, 2013 2:14 AM o: Discussion of precise time and frequency measurement ubject: Re: [time-nuts] Z3801A trouble y first suspect was the power supply, as you guys suggested. Although the ower supply read OK with no load, I dug around in my junk and found another upply to replace it with. I just swapped it out and no more rebooting. Now have to wait until I get GPS lock and the thing stabilizes again. The failure was at an inconvenient time, as I was using the GPSDO to adjust n OXCO that I am going to put into a project. I've had the OCXO on my able, cooking for weeks. Joe Gray 5JG n Sat, Jan 12, 2013 at 10:40 PM, bownes bow...@gmail.com wrote: That is exactly what mine does when it has marginal power on the 48v input. You may find that 50-52vdc works. On Jan 13, 2013, at 0:14, Joseph Gray jg...@zianet.com wrote: After many years of faithful service, my Z3801A has stopped working. It seems to be going through a loop at powerup. All of the LEDs blink at once, then they blink in order, left to right. After several seconds, this is repeated. I'll have to clear the bench of the project I was working on so I can take the Z3801A apart. Joe Gray W5JG ___ 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. ___ ime-nuts mailing list -- time-nuts@febo.com o unsubscribe, go to ttps://www.febo.com/cgi-bin/mailman/listinfo/time-nuts nd follow the instructions there. __ ime-nuts mailing list -- time-nuts@febo.com o unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts nd 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] Z3805A cooling requirements?
Hi Said, just additional question: did the DC current increased when you started to blow air You should run this test / blowing air / minimum 24 hrs.or longer! Rgds Ernie. -Original Message- From: SAIDJACK saidj...@aol.com To: time-nuts time-nuts@febo.com Sent: Thu, Dec 20, 2012 3:57 am Subject: Re: [time-nuts] Z3805A cooling requirements? Not sure about that, if you look at the frequency plot after ~20 minutes in moving air the frequency was still extremely close to 10.00MHz.. to ithin 1E-011 of 10MHz. This is a free-running 10811. ompare that to the plot of the OCXO I had sent out some hours ago when it as running stable inside the foil - there was almost no average frequency hange between the two tests. f the heaters had an issue keeping average crystal temperature stable, hen the frequency would have changed from the first plot to the last plot I ould think. In my opinion the airflow is just adding a huge bunch of heater control loop noise to the output stability, or there are components on the CB which are very sensitive to the airlfow. Consider that this unit and t's PCB was designed to live inside the 53132A (very close to the fan) that am now using as an air source. One thing this tells me: the fan in the ounter could be disabled and it would improve the units stability, if one eeps an eye on internal counter temperature. ye, aid n a message dated 12/19/2012 18:42:08 Pacific Standard Time, ct...@hotmail.com writes: I think the data shows that the heaters were losing ground, which would xplain the steadily falling temp of the SC cut quartz. Thomas Knox ___ ime-nuts mailing list -- time-nuts@febo.com o unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts nd 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] Synergy SSR-6TR
Hi David, I am interested about this GPS module but to get here in Hungary it is also around 60-80 USD... Rgds Ernie. -Original Message- From: David J Taylor david-tay...@blueyonder.co.uk To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Fri, Dec 14, 2012 3:28 pm Subject: Re: [time-nuts] Synergy SSR-6TR David nfortunately as easy as that is to do that would remove me from the buy 1 ist. orry. ou need a timenut that doesn't want one. :-) aul B8TSL == Yes, I appreciate that, Paul. Why I said almost considered. But if here is someone willing, I would be grateful, as might others on this side f the pond. 73, avid GM8ARV - atSignal Software - Quality software written to your requirements eb: http://www.satsignal.eu mail: david-tay...@blueyonder.co.uk __ ime-nuts mailing list -- time-nuts@febo.com o unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts nd 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] Nifty MINI TIC for DMTD work
Hi Gents, please put me on the list. I should like to have one unit or a KIT. Rgds Ernie. -Original Message- From: Volker Esper ail...@t-online.de To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Mon, Nov 19, 2012 8:57 pm Subject: Re: [time-nuts] Nifty MINI TIC for DMTD work 'd like to be on the list. Definitely. Where do I have to pay? Volker m 19.11.2012 20:04, schrieb cdel...@juno.com: MINI-TIC for DMTD work Hi Everyone! I've been testing a Miniature 2 channel TIC that Bert Kehren and Juerg Koegel and Richard Mc Corkle have designed. It has 9 digits/Sec. and with a 1HZ offset in the DMTD unit gives a resolution of 1X10-15th at 10 MHz, 2X10-15 with a 5 MHz input, when measuring Allan deviation. The 200 MHz version doubles the resolution. Of course the baseline performance of the DMTD unit and the stability of the DMTD reference determines the actual accuracy you can obtain. (My dual mixer has a baseline of approx. 8X10-14th at 1 second and my best reference is 4X10-13th at 1 second.) The MINI takes a 5 or 10 MHz reference that only has to be stable to parts in 10-8th/sec. I used a neat 14PIN ovenized DIP clock chip I got on eBay and recently discussed on the list. The reference is multiplied to 100Mhz for use as the counters clock. The MINI is about 2.5 by 2 inches and has only 5 chips. Two opto couplers an op amp for two analog channels are also on the board. If run on 5 volt a 3.3 V regulator is also on the board. Power required is +5VDC 0.05 A and +- 12 (for the RS232 interface) It also has two pins you can individually ground to measure the period of the beat note from either channel. This allows you to adjust the offset frequency quickly and accurately. I installed the MINI into a 1U chassis with the power supply and also added heartbeat LEDS for each channel to show the presence of the 1PPS inputs. I have plotted several Rubidium and many Quartz using the MINI simultaneously with a SR620 counter/timer. The plots are identical! So much so that I am going to retire and sell my SR620! I understand work is complete on a 4 channel counters and Bluetooth interface, and work is ongoing on a LCD. The MINI material cost is less than $25.00 depending on how many boards are ordered! Resoution based on clock frequency and beat frequency: Carrier[MHz] Beat [Hz] HeterodyneTIC [ns] Resolution 10101.00E+06101.00E-14 1011.00E+07101.00E-15 1011.00E+0755.00E-16 10101.00E+0655.00E-15 5105.00E+05102.00E-14 515.00E+06102.00E-15 515.00E+0651.00E-15 5105.00E+0551.00E-14 Woman is 53 But Looks 25 Mom reveals 1 simple wrinkle trick that has angered doctors... http://thirdpartyoffers.juno.com/TGL3141/50aa82cb1214a2ca03f8st04duc ___ 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. ___ ime-nuts mailing list -- time-nuts@febo.com o unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts nd 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] LightSquared
The Saga just goes on...! INFO only. Rgds Ernie. Lightsquared Returns With New Proposal For GPS Fix October 4, 2012 The company asked the FCC to modify its license application so it can use its 5MHz of spectrum that haven’t caused GPS concerns. LightSquared, the now bankrupt wireless broadband venture, is seeking regulatory approval from the FCC for a plan it believes will fix interference problems with GPS technology. In two filings, LightSquared, once a darling of the FCC for its bold broadband initiative, told the commission it will now forgo using the airwaves that triggered the GPS interference problems in the first place. The Wall Street Journal reported that the filings come at a critical time in LightSquared’s Chapter 11 case, which was filed in May. The company is in court this week, seeking permission from the judge to extend the exclusive right to file a reorganization plan until this summer, reducing the threat of rival proposals. LightSquared asked the FCC to modify its license application so it can use its 5MHz of spectrum that haven’t caused GPS concerns. It also sought another 5MHz that it would share with users within the federal government. In its latest proposal, the company said it would forego using the “upper” 10MHz that have caused GPS interference concerns. It still wants the FCC to consider use of that 10MHz, but agreed to wait for and cooperate with “operating parameters and revised rules for terrestrial use of this spectrum.” There is no timetable for a response from the FCC on LightSquared’s request. Creditors in the bankruptcy case have been critical of LightSquared and the man who controls its equity, hedge fund manager Phillip Falcone. Those lenders have said a loan made prior to the bankruptcy filing to LightSquared favored Falcone and his firm, Harbinger Capital Partners, over other creditors. LightSquared received conditional FCC approval in 2011 to deploy its low-cost broadband network. But earlier this year, the FCC denied approval after the National Telecommunications and Information Administration (NTIA) found the network could interfere with GPS. Falcone and his company have spent hundreds of millions of dollars on LightSquared. Both are being sued by securities regulators for a variety of alleged violations, including misappropriation of client money, manipulating bond prices and favoritism of certain clients. Falcone has said he is innocent and will fight the charges, the Journal reported. SOURCE: LightSquared ___ 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] Active antennas for a Thunderbolt...
Chuck, I have seen already intermittent antenna receptacle on the back of the TB, also chk all coax connectors for solid contact. Rgds Ernie. -Original Message- From: Chuck Harris cfhar...@erols.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Mon, Jul 30, 2012 9:52 pm Subject: Re: [time-nuts] Active antennas for a Thunderbolt... Hi Warren, I am not battling weak signals, I am battling no signals from wo mushroom type antennas. -Chuck Harris WarrenS wrote: Have you used Lady Heather to automatically set the Default settings? To allow the Tbolt to work with weak signals from any antenna that I've tried, ven when indoors, I start by setting the TBolt's AMU level from the default of 4 down to 0. This can be done with the Tbolt S/W or LH. My general AMU setting goal is to make it low enough so that the TB is always sing a minimum of three satellites. If the TB ever does goes into holdover, that should be fixed, because that ill cause some serious freq offset noise at the TBolt's output, The usual holdover fix is to give the antenna a better view of the sky and/or ower the TBolts AMU setting. It is better to set the AMU too low which will allow it to use weak signals ll the time than it is to set it too high and have No signals even for a short time. After lowering the AMU value, if you want to optimize the setting, LH has all inds of tools to help, such as the sat signal strength plot. ws ** cfharris at erols.com said: I suspect that I have just had the bad luck to buy two bad antennas, but I am naturally curious what happens when the sample set gets larger. I have 2 TBolts using the small Motorola antenna from TAPR in a not-good location. The sheet says 24 dB of gain. I have 6 or 9 or ?? feet of RG-6. They work as expected, that is they work, but not well. The holdover logic gets tested frequently and surveys take a long time. But they do work. ___ 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. ___ ime-nuts mailing list -- time-nuts@febo.com o unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts nd 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] Naive reference oscillator qustion, but has to be asked!
Hi Chris, the Kenwood TCXO module is quite adequate because the microwave transverter LO is the major problem... let say a 10GHz/144 transverter LO xtal osci is 106,500MHz and multiplying up to 10GHz / fxtalX96 / is more critical to get exact 10368,000MHz Rgds Ernie. -Original Message- From: Chris Wilson ch...@chriswilson.tv To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Fri, Jun 29, 2012 12:39 pm Subject: Re: [time-nuts] Naive reference oscillator qustion, but has to be asked! You could use a frequency synth with an external 10 MHz reference to generate the required 15.6 MHz signal. On 06/29/2012 02:54 AM, Chris Wilson wrote: 29/06/2012 10:49 Titter if you must, but if you don't ask, you don't learn. My newly acquired Kenwood TS-590 transceiver has an option for a temperature controlled reference xtal module. The specs for it are : Output Frequency . . . . . . . . . . 15.6 MHz Temperature Stability . . . . . . . . . . . . . . . Within +/- 0.5 ppm (–10°C ~ 50°C) . . . . . . . . . . . . . . . Within +/- 1.0 ppm (–20°C ~ 60°C) Frequency Stability (long term) . . . within +/- 1.0 ppm/year Output . . . . . . . . .. . . . . . . 1.0 Vp-p (10 k ohm // 10 pf) Could the output of a GPS disciplined 10MHz standard be altered in frequency for this purpose? Thanks. 29/06/2012 11:36 Thanks, is it worth even thinking about, or is the Kenwood add on CXO module more than adequate? Only reason I ask is I will be using the ig as a driver for a microwave transverter. -- Best Regards, Chris Wilson. __ ime-nuts mailing list -- time-nuts@febo.com o unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts nd 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] Trimble SMT board
Hi, anybody having some experience with this board.. I have the following problemafter power on the board it does not output any msg only if I use the TrimbleStudio SMT software..on my PC.. Is there any solution to use the board without the PC/software ??? Thanks a lot for any usefull advise. Rgds Ernie. ___ 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] Trimble SMT board
Azelio, As I said NO any type of msg comes out from the boardonly When I use the TrimbleStudio SMT software which seems to me it sending some kind of initialization to the board. Rgds Ernie. -Original Message- From: Azelio Boriani azelio.bori...@screen.it To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Mon, Jun 25, 2012 2:06 pm Subject: Re: [time-nuts] Trimble SMT board A quick look at the Trimble Resolution SMT GPS revealed that the TSIP acket 0x7A can manage the NMEA output: what sentences and their time nterval so the TrimbleStudio must have that option. On Mon, Jun 25, 2012 at 1:58 PM, Azelio Boriani azelio.bori...@screen.itwrote: It's easy: let it run with the power on, what else? What exactly do you mean: no PC and what instead of the PC? Trimble products generally use the TSIP protocol, not a human readable one like the NMEA. Yes, the NMEA isn't easy to read but usually you can figure out date, time, lat/lon and 3D fix present or not. With the TrimbleStudio you can configure the GPS to put out the NMEA sentences (I think, I have no experience with the SMT but usually the GPSes from Trimble can be configured to some extent). On Mon, Jun 25, 2012 at 1:18 PM, Erno Peres erniepe...@aol.com wrote: Hi, anybody having some experience with this board.. I have the following problemafter power on the board it does not output any msg only if I use the TrimbleStudio SMT software..on my PC.. Is there any solution to use the board without the PC/software ??? Thanks a lot for any usefull advise. Rgds Ernie. ___ 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. __ ime-nuts mailing list -- time-nuts@febo.com o unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts nd 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] Trimble SMT board
Hi David, thanks a lot for the info, I have also the 1PPS output, but had the impression that it will also output TSIP or any other kind of MSG upon power-up... and you can configure the board as required of the need.it outputs according to the TrimbleStudio SW is TEP format but any interruption of the power / +3.3 V / then no any msg comes out.. I want to use for the Brook Shera boardso the 1PPS is OK. I did not chked out with the Motorola software or TAC32 but will do. Rgds Ernie. PS. for what board / gpsdo / do you use the SMT gps.. -Original Message- From: David J Taylor david-tay...@blueyonder.co.uk To: time-nuts time-nuts@febo.com Sent: Mon, Jun 25, 2012 2:57 pm Subject: Re: [time-nuts] Trimble SMT board Hi, anybody having some experience with this board.. have the following problemafter power on the board it does not output ny msg only if I use the TrimbleStudio SMT software..on my C.. s there any solution to use the board without the PC/software ??? Thanks a lot for any usefull advise. Rgds Ernie. __ rnie, I have one of these boards, and when I powered it up I got locked PPS ignals (albeit, quite narrow width). I didn't need to use any PC software or this - no configuration was required. If you look back on the mailing ist messages, you may find a mention that the units recently on sale use a otorola protocol, not the Trimble protocol. Cheers, avid - atSignal Software - Quality software written to your requirements eb: http://www.satsignal.eu mail: david-tay...@blueyonder.co.uk __ ime-nuts mailing list -- time-nuts@febo.com o unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts nd 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] Trimble SMT board
Hi David, I have chked vith TAC32 SW, 9600 Baud and Motorola binary code and it is working OK. even will initialize the SMT gps board when there is a power interruption and no any protocol comes out. Also chked with the Winoncore SW and it display data but not all.. and this SW does not initialize the SMT board. Of course and Trimble gps Studio is OK. Hope this helps a little. Rgds Ernie. -Original Message- From: David J Taylor david-tay...@blueyonder.co.uk To: time-nuts time-nuts@febo.com Sent: Mon, Jun 25, 2012 4:08 pm Subject: Re: [time-nuts] Trimble SMT board Hi David, thanks a lot for the info, I have also the 1PPS output, but had the mpression that it will also output TSIP or any other kind of MSG upon ower-up... and you can configure the board as required of the need.it utputs according to the TrimbleStudio SW is TEP format but any nterruption of the power / +3.3 V / then no any msg comes out.. want to use for the Brook Shera boardso the 1PPS is OK. did not chked out with the Motorola software or TAC32 but will do. Rgds Ernie. S. for what board / gpsdo / do you use the SMT gps.. __ rnie, I will be interested to know whether the Motorola format works so look orward to your report back. I have no definite use for the board - it just ounded like a good buy. My interest is more in time than frequency, so I ould use it for PPS generation for NTP on a PC, with the Internet or other ervers providing the nearest second and the device providing the actual econd edge. Having seen how short the pulse is, though, I am uncertain hether it would work directly. I already have Garmin GPS 18 LVC, 18x LVC, nd Sure Electronics PPS sources, but having a third manufacturer (and one s highly rated as Trimble) can't be a bad thing. G There is also a remote possibility to use it in a stand-alone ulti-lateration device, although the non-standard output format could cupper that! It uses an older Trimble SMT board. http://www.modesbeast.com/radarcape-weblog.html Cheers, avid - atSignal Software - Quality software written to your requirements eb: http://www.satsignal.eu mail: david-tay...@blueyonder.co.uk __ ime-nuts mailing list -- time-nuts@febo.com o unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts nd 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] CW12-TIM vs M12M and the world
Hi Ulbrich, Sorry but not everybody a digital and/or a professional guru... can you please be a more specific namely to show us the pre filter and other circuitif you do not mind. Understand that the key point is the PLL or the phase comparator circuit.if you want to build you own GPS-DO. Many thanks and best regards, Ernie. -Original Message- From: Ulrich Bangert df...@ulrich-bangert.de To: 'Discussion of precise time and frequency measurement' time-nuts@febo.com Sent: Sat, Mar 31, 2012 2:53 pm Subject: Re: [time-nuts] CW12-TIM vs M12M and the world Bert, sometimes a manual can be a true treasure chest! Just download the PRS-10 anual at http://www.thinksrs.com/downloads/PDFs/Manuals/PRS10m.pdf and find starting on page 13 the complete instructions on how to build your wn GPSDO. A basic knowledge of math, programming and control theory is eeded to understand the manual but then: It works. I have constructed my own DIY GPSDO on the base of the information that I have found there, ncluding the pre-filter. Best regards lrich -Ursprungliche Nachricht- Von: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] Im Auftrag von ewkeh...@aol.com Gesendet: Samstag, 31. Marz 2012 13:46 An: time-nuts@febo.com Betreff: Re: [time-nuts] CW12-TIM vs M12M and the world Ulrich can you tell us more about your pre filter? Thank you Bert Kehren In a message dated 3/31/2012 6:23:49 A.M. Eastern Daylight Time, df...@ulrich-bangert.de writes: Thomas, Has anyone compared the M12M to the M12+? I have done some measurements on the M12+ with typical results as shown in http://www.ulrich-bangert.de/M12Performance.jpg The red line is the raw phase data of the M12's PPS against a PPS derived from a local FRK-L rubidium. Note that you do not observe an overall difference frequency (and a resulting drift in phase) because the FRK-L is disciplined by the GPS. The blue line is the sawtooth corrected phase data and it becomes immediatly clear HOW IMPORTANT applying the correction is. The yellow line show you what happens if the sawtooth corrected phase data is sent through a pre-filter (lowpass with 1/3 the time constant of the main pll loop) before entering the loop itself. That is something that I learned from the PRS-10 manual. You may decide on your own which data you would like to work on in a GPSDO. Best regards Ulrich Bangert -Ursprungliche Nachricht- Von: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] Im Auftrag von Tom Knox Gesendet: Freitag, 30. Marz 2012 22:19 An: Time-Nuts Betreff: Re: [time-nuts] CW12-TIM vs M12M and the world Has anyone compared the M12M to the M12+? Thanks for all the input, it is really appreciated. best wishes; Thomas Knox CC: time-nuts@febo.com From: saidj...@aol.com Date: Fri, 30 Mar 2012 09:53:17 -0700 To: time-nuts@febo.com Subject: Re: [time-nuts] CW12-TIM vs M12M and the world Hello Ed, Azelio, We should also compare the same parameters. Sawtooth error of the m12+ of +/-25ns is not its standard deviation, it's max/min. Compare that number to your 30ns max/min measurement on the 5372a. Standard deviation of the m12+ is around 2ns with correction. That needs to be compared to the 5ns you measure on the 5372a as that is the best performance you will get from the CW12. Yes the uncorrected 1pps of the m12 is worse, but it is designed to be used with correction. So in the end the m12m still performs better than the CW12. Bye, Said Sent From iPhone On Mar 29, 2012, at 1:56, Azelio Boriani azelio.bori...@screen.it wrote: We (that is my company) use the CW12-TIM (NMEA version) and its PPS wonders as usual, nothing different from a uBlox LEA-5T or the M12M. On Thu, Mar 29, 2012 at 9:32 AM, Hal Murray hmur...@megapathdsl.net wrote: The sawtooth error on the Motorola M12+ is about +/- 25ns, while the CW12-TIM has a sawtooth error of +/- 2 ns, so correcting for the sawtooth error is not as critical with the CW12-TIM. The first claim The sawtooth error on the Motorola M12+ is about +/- 25ns is correct but are you absolutely sure that the second claim is correct too? It would mean a factor 10 improvement of the CW12-TIM against the M12 which is hardly believeable. The 25 ns probably comes from period of the the free running clock they are using. It doesn't seem unreasonable to me to get 10x better if they use a GPSDO for the local clock so they can get the PPS edge right where they want it. -- These are my opinions, not necessarily my employer's. I hate spam.
Re: [time-nuts] FE5680A x-rays
Hi Rich, please advise which program can I open the files...?? Rgds Ernie. -Original Message- From: Rich msima...@sympatico.ca To: time-nuts time-nuts@febo.com Sent: Tue, Mar 27, 2012 12:24 am Subject: Re: [time-nuts] FE5680A x-rays Ok here they are: About 30 real-time X-ray images were done in transmission nd the images were captured using the imaging system, rinted and later assembled to create a one meter scale of he printed circuit board. A low voltage, in the 50kV range, as used to better visualise the hidden copper traces. In the attached file the two directories in Data are ne: image format in raw (need to be flipped nd rotated as needed if you want to look up or down at the pc board) and wo: in the psd Photoshop format. They can be converted to jpg with a slight loss of esolution by many software packages, if esired. Two other files, in the top level, re for guidance in positioning them on the chart and a ook at the final assembly result (at much lower resolution). The images are available at: ttp://download.muanalysis.com/FE-5680A.zip EnjoY am happy as my unit is now working correctly. t was an e-bay bargain if you don't count the debug time!!! ope this info will be useful to others. __ ime-nuts mailing list -- time-nuts@febo.com o unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts nd 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] DIY GPS-DO
Hi, have a look at trhis side... http://www.g4jnt.com/EvenSimplerSimplestGpsdoPossible.htm Rgds Ernie -Original Message- From: Magnus Danielson mag...@rubidium.dyndns.org To: time-nuts time-nuts@febo.com Sent: Sat, Mar 10, 2012 5:19 pm Subject: Re: [time-nuts] DIY GPS-DO On 03/10/2012 04:11 PM, Azelio Boriani wrote: Ah, yes, now I see: you suggest to keep track of the FOM and DOP from message #21 and move the oscillator to minimize them. Interesting and doable. The oscillator time and frequency bias is already being supplied, so no need for a PICTIC to measure. Just read the message coming down the serial line and use that for steering. Interesting, as usual, the references by Attila: I'm searching for the book by Roland E. Best. It's a fairly good startingpoint, but I also find Garners PLL book a dense and highly readable book. Cheers, Magnus On Sat, Mar 10, 2012 at 3:59 PM, Attila Kinaliatt...@kinali.ch wrote: On Sat, 10 Mar 2012 14:07:33 +0100 Filip Ozimekme_su...@o2.pl wrote: could you recommend me a good project of GPS-DO? I've got a GPS module with 1PPS output and a 20 MHz VCXO. As I understand to do a phaselock to 1 PPS signal one must build some kind of digital PLL. But I'm not sure how to calculate a correction signal to the VCXO and how to test such a disciplined oscillator. Start with reading the following documents: [1]: James Miller's GPSDO based on a 10kHz output of an Jupiter GPS unit. It is by far the most simple system i've seen sofar. It's mostly analog (beside the dividers) and uses a XOR based PLL for the FEC generation. [2]: A GPSDO around a PIC16C73 from Brooks Shera. It is basically what you want to do. [3]: A GPSDO that is based on an FLL (frequency locked loop) by Betrand Zauhar. Similar to the one above, but because it's using an FLL instead of an PLL it has a slight frequency offset (instead of a slight phase offset) You also want to read: Phase-Locked Loops by Best. The best book on PLL's i've found. Explains everything you need to know. [4]: The PICTIC as an example how to build a time interval counter that is good to1ns (see [5] for information on PICTIC performance). Depending on the stability and accuracy you want to accheive, it might also be possible to use one of the modern uCs that run with100MHz clocks and use its internal timer as TIC. It will give you an measuremnt accuracy better than 10ns, which is in the range of the width of a good timing GPS receiver (see [6]), this would simplify your circuitry quite considerably. Over the past years, there have been numerous discussions on GPSDOs on this mailing list. I suggest you walk trough the archives and read some of them. HTH Attila Kinali [1] http://www.jrmiller.demon.co.uk/projects/ministd/manual.pdf [2] http://www.rt66.com/~shera/QST_GPS.pdf [3] http://ve2zaz.net/GPS_Std/Downloads/VE2ZAZ_GPS_Derived_Std_QEX_09_10_2006.pdf [4] http://www.ko4bb.com/dokuwiki/doku.php?id=precision_timing:pictic [5] http://www.ke5fx.com/pictic.htm [6] http://www.u-blox.com/images/downloads/Product_Docs/Timing_AppNote_(GPS.G6-X-11007).pdf -- Why does it take years to find the answers to the questions one should have asked long ago? ___ 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. ___ 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] FE-5680A Question
Hi Gents, received my FE-5680A UN 63401 S/N 0311-61144... Anybody can advise a few idea about this module..? From the label I can see it requires +5 Volt but no info about the RS232... Can I adjust the C field from the DB9 connector Any info appreciated. Many thanks and best regards, Ernie. ___ 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] FE-5680A Question
Hi Chris, thanks for the info. My second problem is that the unit is in locked position after powering up but after about 5-8min the freq goes down slowly about 9.999.997.3 Hz and the lock ind level is still low. Also noticed that during the sweep the max freq is 10.000.004 Hz and the min freq is 9.999.750 Hz.. I assume that I have to open up the unit and try to re tune the 10Mhz sweep osci.. let say from 9.999.900 to 10.000.100 at least. Any suggestion Thanks and regards, Ernie. -Original Message- From: Chris Albertson albertson.ch...@gmail.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Mon, Feb 13, 2012 7:32 pm Subject: Re: [time-nuts] FE-5680A Question From the label I can see it requires +5 Volt but no info about the S232... Can I adjust the C field from the DB9 connector On the units that require 5V you can adjust the frequency using rs-232 ut only within a very small range around 10MHz. Some of the ocumentation applies to other types of this same model oscillator. Chris Albertson edondo Beach, California ___ ime-nuts mailing list -- time-nuts@febo.com o unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts nd 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] Morion MV89 output level?
Hi Nevell, FYI my one delivers almost +5dBm on 50 Ohm.Ref Voltage +4,86 Volt. Rgds Ernie. -Original Message- From: Scott Newell newell+timen...@n5tnl.com To: time-nuts time-nuts@febo.com Sent: Thu, Feb 9, 2012 5:16 am Subject: [time-nuts] Morion MV89 output level? Got my replacement FE-5680 and a MV89 in from Nichegeek. I figured 'd better power up and check the MV89 before I let 'em know verything was ok. The MV89 is warming up nicely, the current is own to 290 mA (and still dropping), but the output seems low; about 0 mV RMS as measured on a scope with a 10Meg 10x probe. (Datasheet pec is +7 +/- 2 dBm.) The output is too weak to reliably trigger my 345A counter. The reference voltage measures 4.90 VDC. If anyone can make a quick measurement on their MV89, I'd appreciate it. hanks! ewell N5TNL __ ime-nuts mailing list -- time-nuts@febo.com o unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts nd 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] Building a GPSDO trouble using Jupiter-T
Hi Ray, please find on this link the info what you are looking for. http://www.jrmiller.demon.co.uk/projects/ministd/frqstd.htm Rgds Ernie. -Original Message- From: Ray Xu rayxu...@gmail.com To: time-nuts time-nuts@febo.com Sent: Sun, Jan 29, 2012 7:51 am Subject: [time-nuts] Building a GPSDO trouble using Jupiter-T Hi guys I'm planning to build a GPSDO to use as a frequency ref for my GHz ventures. I've done research in what other people have built - but I have no xperience working with long-term precision/stability products (nor do I ave the equipment to do so -- I think). I'm using the Jupiter T (the one with the 10-pin header) GPS and its 10KHz utput in an analog PLL that controls a 10MHz VCXO. It would be ideal for e that if I were to multiply the 10MHz output up to 10GHz, I would get bout a few Hertz or so of inaccuracy. It would also be ideal if I can ave a PLL lock time of a few minutes while maintaining accuracy. However, right now as I am trying to design my project, I can't find enough nformation on the web regarding the VCXO's (or the PLL oscillator, in this ase) short term accuracy effect on output frequency. I know that its hort term accuracy depends on the response time of the PLL, which also epends on the amount of jitter from the Jupiter-T's 10KHz output... I now that the longer the time constant for the PLL, the better accuracy, ut I do not want to wait, literally, hours for it to lock... Also, what is the advantage of using a OCXO instead of a VCXO in terms of hort-term accuracy? If the PLL time constant is only a few seconds, then crystal shouldn't deviate in frequency by too much within a few seconds, ssuming I'm using a crystal bought from a well-known manufacturer...or ould it? I am inclined towards using oscillators that do not require any ignificant warm up time... For those who have experience using the Jupiter T GPS: have bought this ttp://www.ebay.com/itm/Navman-jupiter-T-Tu60-GPS-Kit-1pps-10khz-GPS-Module-/260790984470but could not get it to communicate via serial. So far, I do not have n ntenna available and so the antenna port is just left disconnected. When turn it on, there is a 1pps and 10KHz signal and the TX line is at logic igh. However, I cannot get it to communicate to anything else, even a umb terminal. It does not respond to when I send a message ID to it. Because of computer difficulties, I am using the PicKit 2's UART tool). s my device a dud or am I doing something wrong? Many inputs is highly appreciated. Thanks -- _ 3, Ray Xu F5LJO __ ime-nuts mailing list -- time-nuts@febo.com o unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts nd 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] New unit of time measurement
This is why the North-Italy territory wants to be separeted the rest of Italy..hihi EP. -Original Message- From: David C. Partridge david.partri...@perdrix.co.uk To: 'Discussion of precise time and frequency measurement' time-nuts@febo.com Sent: Mon, Jan 16, 2012 12:59 pm Subject: Re: [time-nuts] New unit of time measurement Hehe - try driving in Napoli some day - makes Roma seem positively sane, and orino is civilised compared to Roma! D. __ ime-nuts mailing list -- time-nuts@febo.com o unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts nd 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] TEMEX Rubidium
Hello, I have a Temex RMO 10MHz rubidium osci but no lock signal comes out. Checking the RS232 diag code I have the flwng hex code: 7D 04 39 8B 41 4A 48 CB where the second HEX code indicating the Rb signal level which is in my case is almost zero and it should be 1,0 to 3,3 Volt. Opening up the unit/case I found that the 20MHz xtal osci signal level is low, it stops oscillating when I put very close to my finger-tipand has to be a power reset in order to get it oscillating again...??...touching other pars on the PCB found also that it locks to a freq and the Lock detect level is OK / TTL / but the 10MHz freq is almost 180 Hz LOW.. playing around with cooling spray on different spot on the PCB sometimes is stops 10MHz and the lock detect voltage is OK but only a few sec and then drops out again.. the unit prefer to lock to the lower freq and just sometimes locks for a few sec to 10MHz exactly I have no manual ie. circuit diagram and looking any good advise if somebody had some hands-on experience to repair this unit. I assume it has problem with the 90MHz VCO circuit? Please help. Many thanks and rgds, Ernie. ___ 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] Getting my Rockwell D200 GPS to work
Hi Don, this type of receiver sometimes need a good 15-20 min to find their place... they are not very sensitive... also if the receiver comes-up in NMEA mode then they probably used a spec application and it is much better to config the 20 pin connectors to Rockwell-binarymode and use the LabMon 49 software until the receiver alive and then you can config back to NMEA mode. Rgds Ernie. -Original Message- From: shalimr9 shali...@gmail.com To: Time-Nuts time-nuts@febo.com Sent: Sat, Jan 7, 2012 3:21 pm Subject: Re: [time-nuts] Getting my Rockwell D200 GPS to work I test all my GPS receivers with a hockey puck type antenna attached to the wall n my hamshack, which is upstairs, but under the ceiling and the roof and I have ever had one fail to lock within reasonable time. With this setup, Thunderbolts ccasionally go on holdover, but never for very long. Of course, when I plug them in the external Symmetricom antenna, they typically ee more satellites and don't go into holdover. I am in Northwest Florida, so probably at a lower latitude than most of you, so he same setup farther north may not work as well. Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -Original Message- rom: Azelio Boriani azelio.bori...@screen.it ender: time-nuts-boun...@febo.com ate: Sat, 7 Jan 2012 02:00:21 o: Discussion of precise time and frequency measurementtime-nuts@febo.com eply-To: Discussion of precise time and frequency measurement time-nuts@febo.com ubject: Re: [time-nuts] Getting my Rockwell D200 GPS to work Absolutely yes, the antenna must see the sky, not the ceiling. Even very ensitive GPS receivers must have a good view of the sky for the first fix, hen you can bring the antenna indoor. You can try positioning the antenna ery near a window for just a test but better a good view. The car roof is kay but you must wait several minutes (12 minutes at most) to let the eceiver download the almanac. On Sat, Jan 7, 2012 at 1:54 AM, Don Lewis dlewis6...@austin.rr.com wrote: Maybe I didn't take positioning seriously. The antenna is currently on a shelf above my workbench, there is a ceiling and an upstairs above it. Then the roof. Is it very critical to be outside in order to 'see' the sky? I did take it out once and set the antenna on my car roof, but still no satellites. -Don - -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of bownes Sent: Friday, January 06, 2012 6:49 PM To: Discussion of precise time and frequency measurement Cc: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Getting my Rockwell D200 GPS to work Step one...is the antenna in a location where it can see they sky? Sorry if it is a stupid question but you already said it was plugged in. :) On Jan 6, 2012, at 19:24, Don Lewis dlewis6...@austin.rr.com wrote: Can someone please give me some pointers (my first time with a GPS module). A little hand-holding, pls. I bought three of these Rockwell D200 GPS receivers. (It's little GPS PWB with an antenna connector and pins for connecting to the RS232- PC) All three 'appear' to work the same way (no apparent capture of satellites). Here's what I have: 1.VisualGPS installed and running. 2.A small USB-RS232 card installed and appears to be operational. 3.Small GPS active antenna plugged in. 4.VisualGPS monitor just repeatedly displays: $GPGGA,,0,00,,,*66 5.I think I understand this to be NMEA code to mean no satellites have been acquired. 6.The Rockwell D200 draws ~180ma (5V) with no antenna and ~190ma with the small active antenna plugged in. What am I doing wrong? Other than maybe cheap china gps' and antenna??? But it is what I could afford and thought it would be cheap to learn on. Thanks for your help. -Don ___ 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. __ ime-nuts mailing list -- time-nuts@febo.com o unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts nd follow the instructions there. __ ime-nuts mailing
Re: [time-nuts] Getting my Rockwell D200 GPS to work
Don, the LabMon sw running only under DOS system..! rgds Ernie -Original Message- From: Don Lewis dlewis6...@austin.rr.com To: 'Discussion of precise time and frequency measurement' time-nuts@febo.com; shalimr9 shali...@gmail.com Sent: Sat, Jan 7, 2012 6:30 pm Subject: Re: [time-nuts] Getting my Rockwell D200 GPS to work Ernie: Do you have a link, pls, ...to LM49 that will work with WindowsXP? hanks, ...-Don -- Original Message- rom: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On ehalf Of Erno Peres ent: Saturday, January 07, 2012 8:40 AM o: shali...@gmail.com; time-nuts@febo.com ubject: Re: [time-nuts] Getting my Rockwell D200 GPS to work i Don, this type of receiver sometimes need a good 15-20 min to find their place... hey are not very sensitive... lso if the receiver comes-up in NMEA mode then they probably used a spec pplication and it s much better to config the 20 pin connectors to Rockwell-binary ode and use the LabMon 49 software until the receiver alive and then ou can config back to NMEA mode. Rgds Ernie. Original Message- rom: shalimr9 shali...@gmail.com o: Time-Nuts time-nuts@febo.com ent: Sat, Jan 7, 2012 3:21 pm ubject: Re: [time-nuts] Getting my Rockwell D200 GPS to work test all my GPS receivers with a hockey puck type antenna attached to the all my hamshack, which is upstairs, but under the ceiling and the roof and I ave ver had one fail to lock within reasonable time. With this setup, hunderbolts casionally go on holdover, but never for very long. f course, when I plug them in the external Symmetricom antenna, they ypically e more satellites and don't go into holdover. am in Northwest Florida, so probably at a lower latitude than most of you, o e same setup farther north may not work as well. idier KO4BB ent from my BlackBerry Wireless thingy while I do other things... Original Message- om: Azelio Boriani azelio.bori...@screen.it nder: time-nuts-boun...@febo.com te: Sat, 7 Jan 2012 02:00:21 : Discussion of precise time and frequency measurementtime-nuts@febo.com ply-To: Discussion of precise time and frequency measurement time-nuts@febo.com bject: Re: [time-nuts] Getting my Rockwell D200 GPS to work bsolutely yes, the antenna must see the sky, not the ceiling. Even very nsitive GPS receivers must have a good view of the sky for the first fix, en you can bring the antenna indoor. You can try positioning the antenna ry near a window for just a test but better a good view. The car roof is ay but you must wait several minutes (12 minutes at most) to let the ceiver download the almanac. n Sat, Jan 7, 2012 at 1:54 AM, Don Lewis dlewis6...@austin.rr.com wrote: Maybe I didn't take positioning seriously. The antenna is currently on a shelf above my workbench, there is a ceiling and an upstairs above it. Then the roof. Is it very critical to be outside in order to 'see' the sky? I did take it out once and set the antenna on my car roof, but still no satellites. -Don - -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of bownes Sent: Friday, January 06, 2012 6:49 PM To: Discussion of precise time and frequency measurement Cc: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Getting my Rockwell D200 GPS to work Step one...is the antenna in a location where it can see they sky? Sorry if it is a stupid question but you already said it was plugged in. :) On Jan 6, 2012, at 19:24, Don Lewis dlewis6...@austin.rr.com wrote: Can someone please give me some pointers (my first time with a GPS module). A little hand-holding, pls. I bought three of these Rockwell D200 GPS receivers. (It's little GPS PWB with an antenna connector and pins for connecting to the RS232- PC) All three 'appear' to work the same way (no apparent capture of satellites). Here's what I have: 1.VisualGPS installed and running. 2.A small USB-RS232 card installed and appears to be operational. 3.Small GPS active antenna plugged in. 4.VisualGPS monitor just repeatedly displays: $GPGGA,,0,00,,,*66 5.I think I understand this to be NMEA code to mean no satellites have been acquired. 6.The Rockwell D200 draws ~180ma (5V) with no antenna and ~190ma with the small active antenna plugged in. What am I doing wrong? Other than maybe cheap china gps' and antenna??? But it is what I could afford and thought it would be cheap to learn on. Thanks for your help. -Don ___ 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
Re: [time-nuts] eBay Giveaway Vectron OCXOs
Hi, I also would use an adjustable PS and checking the output RF level to see if the RF level is increasing while incraising the DC voltage... when the output amplitude is not changing anymore then it should be the operating DC voltage or chk the outcoming Ref DC voltage. Rgds Ernie. -Original Message- From: Hal Murray hmur...@megapathdsl.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Fri, Dec 23, 2011 8:33 am Subject: Re: [time-nuts] eBay Giveaway Vectron OCXOs I'm getting a signal out with 3.3vDC in. I haven't tried to test this higher. The data sheet at http://www.vectron.com/products/ocxo/c4550.pdf hows 3 common input voltages. 3, 5, and 12 V. It also says 3 W warmup. So I'd be tempted to see how much power it used as cranked up the input voltage. (1 W steady state.) -- hese are my opinions, not necessarily my employer's. I hate spam. __ ime-nuts mailing list -- time-nuts@febo.com o unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts nd 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] Buzzing 5061B
Hi Jeff, looks like the UPS battery and the 5061B draws too much currenttogether just charge-up the UPS and when it is OK plug the other unit in This is my first guess. Rgds Ernie.. -Original Message- From: Jeffrey Okamitsu w...@w3kl.com To: Time Nuts time-nuts@febo.com Sent: Sat, Sep 3, 2011 12:32 pm Subject: [time-nuts] Buzzing 5061B Hi. e lost power for several days after the hurricane last weekend. As a recaution I pulled the AC plug for my 5061B from the UPS it's attached to since was pretty sure that we would be without power for a while and didn't want to ave the unit plugged in when the power came back in case there was a surge. ower was restored on Tuesday but I only got around to powering up the system his morning. hen I plugged it in, it immediately started making a buzzing sound - alomost ike an alarm. The system appears to be working normally otherwise - alarm LED n, clock advancing, etc. 've never heard this buzzing before during power up. ot knowing what the issue was, I powered the system down. nyone have any clue before I start tearing it down? TW - I don't see any mention of this in the manual. hanks in advance. eff __ ime-nuts mailing list -- time-nuts@febo.com o unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts nd 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.
