Re: [time-nuts] Trimble Thunderbolt NMEA ?
I'll second that. I had a sailboat a while back with about 1/2 dozen NMEA devices off all kinds (GPS, Water speed sensors, Wd speed and direction, magnetic compass and so on). All feeding the nav system. NMEA was designed for marine navigation networks. Th spec is really poor for timing in that the data is valid within the current second That means that it could be up to one second old. On Mon, Mar 2, 2015 at 9:33 AM, Didier Juges shali...@gmail.com wrote: Tim, NMEA is normally used for navigation. It would seem unlikely that anyone would want to use a Thunderbolt for navigation. Can you elaborate on what you are trying yo do? Didier KO4BB On February 25, 2015 10:11:08 PM CST, Tim t...@skybase.net wrote: Hi all, Is there a way to get NMEA instead of TSIP out of a Thunderbolt ? Failing that, is there some translating device that I can insert between the Thunderbolt and another device that is expecting NMEA ? thanks Tim -- VK2XAX :: QF56if23 :: BMARC :: WIA :: AMSATVK ___ 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. -- Sent from my Motorola Droid Razr HD 4G LTE wireless tracker while I do other things. ___ 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. -- 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] Another Free/Cheap Stuff Event coming April 3-4-5 at Sphere
We hold this even every year to clear out accumulated parts and gear, this year there will be about 2 tons of stuff, mainly Tek, HP, Fluke, Boonton test gear items, plus all the remaining Time Code rack units from Trak, Kode, etc., including two huge 4 foot time displays. Perfect for that cape canaveral refit you are making in the basement. This year it will be during the easter long weekend so everybody has time to travel. Everybody has a good time, we have people from all over BC, Alberta, Washington and Oregon each year, and it is especially useful for those interested in high end test gear of all kinds, or just general experimenting. There will also be lots of semiconductors, crystals, capacitors, inductors, ICs, tubes, CRTs, Nixies and hardware. this year we will also have a lot of mechanical parts, tools like stepped drills and pcb drills, milling bits and oddball metalwork. By request, also lots of high power transmitting tubes, and a lot of overhauled and cal'd Fluke DMM's from just $40. Also a Fairchild 6200B 1KV curve tracer and lots of other mysterious goodies. If you have not been up here before, and need directions, we are 4 hours northeast of Vancouver in beautiful British Columbia, and our place looks out over the lake, so it really is beautiful. Email or call if you need more info or have special requests. Hope to see you. YES, we take requests, just let us know what you need specifically, we will try and locate it, and set it aside for you. All the best, walter (walt...@sphere.bc.ca) -- Walter Shawlee 2, President Sphere Research Corporation 3394 Sunnyside Rd., West Kelowna, BC V1Z 2V4 CANADA Phone: (250) 769-1834 walt...@sphere.bc.ca WS2: We're all in one boat, no matter how it looks to you ___ 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 Thunderbolt NMEA ?
On 3/03/2015 4:33 AM, Didier Juges wrote: Tim, NMEA is normally used for navigation. It would seem unlikely that anyone would want to use a Thunderbolt for navigation. Can you elaborate on what you are trying yo do? Hi Didier, I' building a multi frequency beacon based on QRP-labs U3 beacon kit. It has the ability to discipline its oscillator with a PPS input and, using NMEA input, set and maintain time and location for exact control of WSPR and OPERA modes of operation. As it currently only accepts NMEA input I was wondering there was a way to get NMEA out of a thunderbolt. I've lodged an RFE with the developer to add TSIP support to the U3, but I don't think that's going to happen anytime soon. I'd rather use the Thunderbolt as the time and PPS source since its way more accurate than the LEA-M8FGPS module that optionally comes with the kit. I'd like to use the U3 as the basis of beacons all the way to 10GHz and the Thunderbolt is a superior device for locking such things and supplying the base 10Mhz to lock the appropriate LO's. thanks Tim -- VK2XAX :: QF56if23 :: BMARC :: WIA :: AMSATVK ___ 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] Removing FTS 1200/1000A ovens.
Hi, Can anyone tell me if there is a particular method for removing the oven from the flask in a FTS 1200 or 1000A - it seems pretty well wedged in there. Thanks, Angus. ___ 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 Thunderbolt NMEA ?
What NMEA sentences does this device accept? It would not be hard to make a small uP device like say an Arduino that would output those NMEA sentences using data it gets from the TB.The data rate is very slow so even the smallest uP would work. None of this NMEA stuff is very time critical either. It's the PPS that does the timing. On Mon, Mar 2, 2015 at 3:06 PM, Tim t...@skybase.net wrote: On 3/03/2015 4:33 AM, Didier Juges wrote: Tim, NMEA is normally used for navigation. It would seem unlikely that anyone would want to use a Thunderbolt for navigation. Can you elaborate on what you are trying yo do? Hi Didier, I' building a multi frequency beacon based on QRP-labs U3 beacon kit. It has the ability to discipline its oscillator with a PPS input and, using NMEA input, set and maintain time and location for exact control of WSPR and OPERA modes of operation. As it currently only accepts NMEA input I was wondering there was a way to get NMEA out of a thunderbolt. I've lodged an RFE with the developer to add TSIP support to the U3, but I don't think that's going to happen anytime soon. I'd rather use the Thunderbolt as the time and PPS source since its way more accurate than the LEA-M8FGPS module that optionally comes with the kit. I'd like to use the U3 as the basis of beacons all the way to 10GHz and the Thunderbolt is a superior device for locking such things and supplying the base 10Mhz to lock the appropriate LO's. thanks Tim -- VK2XAX :: QF56if23 :: BMARC :: WIA :: AMSATVK ___ 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. -- 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.
Re: [time-nuts] Recording mains frequency/phase [WAS: No GPSsatellites]
On 3/1/2015 3:10 PM, Ben Hall asked: Using a zero-crossing detector with the picPET and logging the timing of each zero-crossing, how do you toss out the other 59 samples each second? I think I figured out a very obvious way. ~60 Hz AC -- zero crossing detector -- divide by 64 ripple counter THEN feed the output of the div by 64 counter into picPET. It is logging a little less than once a minute...but 60 vs 64... thanks much and 73, ben, kd5byb ___ 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] Monsanto IC
Often these parts can be replaced with MSI TTL counter/decoder/logic chips with just a slight change in wiring. I don't know if the SD102 is the Nixie driver, but there are substitutes for Nixie drivers too. I don't know exactly what the SD102 does, but if your friend has the Monsanto 110B schematics he can see what the chip does and how to substitute for it. Tim N3QE On Sun, Mar 1, 2015 at 10:13 AM, jim s jwsm...@jwsss.com wrote: Hi, I have friend with a question about an IC badged with Monsanto. I googled a bit and found that there is a big line of older maybe 60's era counter / timers which were made and badged Monsanto. I am asking here if anyone has some of these or have a knowledge of whether they may have custom IC's. It isn't out of the question that this is a custom front end part, or perhaps some part of a timer circuit they may have developed. The ebay link to the part is below, as is a search string for monsanto on Tucker Electronics manual web page. The question if for a friend who has the IC for sale. Any info appreciated. thanks Jim http://www.etestmanuals.com/Search.aspx?Mfg=MON Ebay listing for a monsanto counter / timer VINTAGE-Monsanto-110B-Programmable-Counter-Timer-/ http://www.ebay.com/itm/331268326313 Monsanto IC: Monsanto-SD102-Vintage-Very-Rare-White-Ceramic-Gold-Zebra-Grey-Trace-IC-/ http://www.ebay.com/itm/371270297731 ___ 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] Recording mains frequency/phase [WAS: NoGPSsatellites]
I'm going to have to build one of these. Assume you have some sort of circuit that converts low-voltage AC from a transformer secondary to a pulse train, start a timer, and count x amount of pulses? Hi Ben, Any microcontroller will allow you to poll for or capture events. Many even have capture/timer capability in h/w. Using a continuously running multi-byte timer you just subtract the current time from the previous time to get time interval (period). The traditional method of starting or resetting a timer after each event is prone to accumulated timing errors. Making periodic snapshots of a continuous timer avoids this. Note that timer wrap-around is transparent for binary counters, as long as your timer won't wrap twice between events. For example, a 16-bit 1 MHz timer is more than sufficient for measuring 60 Hz events (since 16667 65536) with 1 us resolution. In pseudo-code: event() time_now = get_timer() interval = time_now - time_then time_then = time_now serial_output(interval) Now, there are subtle issues with how interrupts and timers work, depending on the microcontroller, but the basic idea of measuring the precise interval between moderately rapid events (like 50/60 Hz cycles) is simple. /tvb ___ 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] simple explanation of noise spectra with mixing
On 3/1/15 10:23 AM, Joseph Gwinn wrote: time-nuts Digest, Vol 128, Issue 1, Message: 8 Date: Sat, 28 Feb 2015 17:46:18 -0800 From: Jim Lux jim...@earthlink.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: [time-nuts] simple explanation of noise spectra with mixing, etc. Message-ID: 54f26f6a.6030...@earthlink.net Content-Type: text/plain; charset=utf-8; format=flowed Is there a handy one pager kind of explanation of noise spectra after some forms of signal processing.. The best source for the math is probably Fred Walls: F. L. Walls, “Correlation between upper and lower sidebands” IEEE Trans. UFFC, Vol. 47, pp 407-410, 2000. PM and AM Noise of Combined Signal Sources, Fred L. Walls, Total Frequency, fredlwa...@cs.com, Proceedings of the 2003 IEEE International Frequency Control Symposium and PDA Exhibition Jointly with the 17th European Frequency and Time Forum, 0-7803-7688-9/03/$17.00 © 2003 IEEE, pages 532-540. I'll look those up.. I was hoping that someone, somewhere had done a guide to phase noise in 1 or 2 pages or a poster. There's lots of pieces scattered hither and yon, but before I spent much time generating my own.. Kind of like that cool plot that a time-nut has which shows the spectra and allan dev of the various colors of noise in a table. For instance, if you have a oscillator which has a 1/f characteristic, and you mix it with itself, what is the spectra of the output of the mixer. Mixing is a multiplicative process, so this is equivalent to squatting the signal, which doubles its frequency, so the effect will be 20 Log10(2)= 6 db increase of phase noise on the double-frequency terms. I assume you mean squaring.. True, the 2 f term will have 6dB more.. But what about the baseband/DC component.. Your bottom-line question will be if there is any cancellation of phase noise; this will involve the time delay for the rata signal to get to the target and return. My guess is that there will be no cancellation. Short ranges (1 km) so actually, lots of cancellation. the round trip delay is 6 microseconds, so a variation at, say, 10 Hz, is pretty well cancelled out. ___ 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] XL-DC Chassis and manual FS
Hello Folks! Noted the discussion about the XL-DC GPS receivers. I have two complete chassis here with exception that the Rubidiums have been removed. Does anyone need parts, etc.? I would be happy to work something out for one or both if someone wants these. Physically good shape, but will inspect closer. I also think I have an instruction manual as well. 73 Jeff Kruth WA3ZKR k...@aol.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.
Re: [time-nuts] Trimble Thunderbolt NMEA ?
Tim, NMEA is normally used for navigation. It would seem unlikely that anyone would want to use a Thunderbolt for navigation. Can you elaborate on what you are trying yo do? Didier KO4BB On February 25, 2015 10:11:08 PM CST, Tim t...@skybase.net wrote: Hi all, Is there a way to get NMEA instead of TSIP out of a Thunderbolt ? Failing that, is there some translating device that I can insert between the Thunderbolt and another device that is expecting NMEA ? thanks Tim -- VK2XAX :: QF56if23 :: BMARC :: WIA :: AMSATVK ___ 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. -- Sent from my Motorola Droid Razr HD 4G LTE wireless tracker while I do other things. ___ 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.
