Re: [time-nuts] New GPS module
Lesson learned. Will not use the tiny URLs again. On Kickstarter and Indigogo you pay thru PayPal and get the money back if it doesn't fund. Of course, I'm the guy that put $500 non-refundable down on a car where the mfg hasn't even built the plant! http://eliomotors.com N0UU ___ 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] L1/L2 GPS Receiver
On 16/01/14 20:29, Hal Murray wrote: anders.e.e.wal...@gmail.com said: The real benefit of dual-frequency is you can do post-processing with PPP. Javad has some modules but they start at 3 kUSD - if anyone knows of hobby level priced L1/L2 receivers that can produce rinex-files for PPP processing that would be interesting! Has anybody considered doing it in software? If I wanted to play with that sort of stuff, is there any particular SDR hardware package/project that would good to start with? You want P(Y) capable receivers, which means 20,46 MHz bandwidth on both L1 and L2 bands. You want say 12 channels. Lots of raw sample data to crunch on in real time. I'd say that you would really like to mimic the traditional style of doing the mechanical stuff in HW/FPGA and then do the remainder in some suitable processor. Going from C/A to P(Y) is a bit challangeing on it's own, as you where not supposed to be able to do that, only to get the P code. 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.
Re: [time-nuts] L1/L2 GPS Receiver
anders.e.e.wal...@gmail.com said: > The real benefit of dual-frequency is you can do post-processing with PPP. > Javad has some modules but they start at 3 kUSD - if anyone knows of hobby > level priced L1/L2 receivers that can produce rinex-files for PPP processing > that would be interesting! Has anybody considered doing it in software? If I wanted to play with that sort of stuff, is there any particular SDR hardware package/project that would good to start with? -- 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.
Re: [time-nuts] talking to Synergy Systems SSR-6Tr (u-blox LEA-6T-0)
FYI: I got an email reply from Art Sepin at Synergy with several helpful documents, which he did not post himself on time-nuts out of concern for seeming too commercial. Apparently they will go up on the Synergy website for the official launch of the SSR product line this June. But trusting that it isn't actually a secret, the magic command is @@Wb 0x01 0x34 --- For SSR boards that include the PIC processor, the @@Wb command has been included to switch between Motorola 9600 baud binary mode and native u-Blox binary & NMEA modes. Because the PIC versions of the SSR boards are designed to plug into an M12+ or M12M slot, full functionality in u-Blox mode is available using u-Center but only at 9600 baud. For higher I/O speeds, select a u-Blox only SSR board part number. 1. For direct SSR interface to a microprocessor, use the following: The Hex command is 40 40 57 62 01 34 00 0D 0A (@@Wb<01><34>). This functionality is available in the full and the evaluation copy of SynTAC available here: http://www.synergy-gps.com/index.php?option=com_content&task=view&id=185&Itemid=196 ___ 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] talking to Synergy Systems SSR-6Tr (u-blox LEA-6T-0)
On Thu, Jan 16, 2014 at 10:16 AM, John Beale wrote: > The one datasheet I could find (nothing on the mfr's website!?) says this > part can talk in three different formats including UBX Binary: > P/N 16062133G SSR-6Tr ROM based, w/PIC, Mot Bin, UBX Bin, NMEA, No Battery > I found that the 133G didn't work as specified in the tech note (Wb/Wc commands). However since I ordered the 152G precisely to get the native ublox interface and they shipped the 133G they cheerfully reprogramed their microcontroller to turn it into a SSR-6Tr(u) - 16062152G. ___ 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] L1/L2 GPS Receiver
Looking at this graph: http://www.thinksrs.com/assets/instr/PRS10/PRS10diag2LG.gif If you have a good PRS10, it only needs adjusting on the many-hours timescale? How much better is a dual-frequency receiver going to be for this, compared to a single frequency receiver? The real benefit of dual-frequency is you can do post-processing with PPP. Javad has some modules but they start at 3 kUSD - if anyone knows of hobby level priced L1/L2 receivers that can produce rinex-files for PPP processing that would be interesting! AW On Thu, Jan 16, 2014 at 6:03 AM, davidh wrote: > Folks, > > I've stumbled across a Novatel 720L, so would like a new receiver module > which supports L1/L2. > > The main goal is to start learning about GPS/Galileo/Beidou. I may use the > derived 1pps as input to my PRS10/10811D reference (or may continue using > the 58503A). My budget is quite limited. > > Thanks, > > david > > ___ > 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] fast edge, rise time.
Paul It weighs 30 lbs. Pictures are on face book or I can email with an address. Bill -Original Message- From: paul swed Sent: Wednesday, January 15, 2014 12:20 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] fast edge, rise time. Bill Interesting and curious what does it weigh? I would guess since its NIST a lot. Regards Paul WB8TSL On Wed, Jan 15, 2014 at 1:15 PM, Bill Reed wrote: Thanks Mark I must have serial number 2 of that series of IPG's. The one in the article is SN-3-75-1 and mine is SN-3-75-2. It was probably fabricated in March 75. I plan on visiting Redstone library to look up references 8 and 9. Bill -Original Message- From: Mark Kahrs Sent: Tuesday, January 14, 2014 12:02 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] fast edge, rise time. You might be interested to know this was discussed in a paper by Jim Andrews (founder of Picosecond Pulse Laboratories): http://www.nist.gov/calibrations/upload/im-25-4.pdf From the age of the paper, I'd say this generator is probably more than 40 years young. On Mon, Jan 13, 2014 at 2:22 PM, Bill Reed wrote: Hi, Since there is no interest in my pulse generator maybe one of you knows someone at NBS who can provide a schematic of the generator. It has " NBS Impulse Generator SN 3-75-2 " engraved on the front panel and is ~ 10 x 16 x 17. Thanks, Bill Reed -Original Message- From: Bill Reed Sent: Tuesday, January 07, 2014 7:53 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] fast edge, rise time. Hi, Since you guys are interested in fast pule generators, I have one you may be interested in. I got it in govt. auction about 25 years ago for ~ $ 50.00. I will sell it to anyone for $ 50.00 plus shipping. I prefer to sell to someone who will restore and use it rather than parting it. It has more than $ 50.00 parts in it. There are a 30 turn 6.5 inch diameter hard line, wide band hybrid coupler, diode assembly and several adapters and attenuators. I believe the hard line discharges into a step diode. The power supply includes 200 V plus other voltages. If I remember correctly ( I have no high speed scope now ) the pulse is 2 nanoseconds wide with a 280 picosecond rise time and and 2.5 Vpp. I checked with a 200 MHz digital scope and can see a pulse that verifies my scopes bandwidth. The rate generator works but has problems. See facebook (ree...@otelco.net) for pictures under Impulse. Bill Reed256 586-3446 -Original Message- From: ct1dmk Sent: Sunday, December 29, 2013 7:36 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] fast edge, rise time. Thank you all for your comments on this subject. Happy new year. Luis Cupido. ct1dmk. ___ 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 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] Trade for GPSDO
Hi. I have an assembled TAPR TAC board with the matching 1pps Motorola GPS and documentation that I would like to trade for a working GPSDO +/- cash depending. If you have a spare good GPSDO (smaller is better) and want to play with an old classic kit that is no longer available, lets discuss. I just don't have the time to start from scratch as I am already 8-10 QRP kits behind. My email for any response is my callsign (ks4ns) at yahoo. Thanks, Dale ___ 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] talking to Synergy Systems SSR-6Tr (u-blox LEA-6T-0)
I was happy to find the one-off $35 deal for the SSR-6Tr from Synergy Systems is still on, and I got mine yesterday. It works OK using Motorola WinOncore12 to talk with it, in Motorola Binary format, and the performance does seem better than the Oncore M12+ I was previously using (eg. smaller average sigma on Lat/Lon/Height values from the same fixed antenna). The one datasheet I could find (nothing on the mfr's website!?) says this part can talk in three different formats including UBX Binary: P/N 16062133G SSR-6Tr ROM based, w/PIC, Mot Bin, UBX Bin, NMEA, No Battery I think several people on the list have this device, I'm curious how you interface with it. What commands switch to NMEA or UBX Binary? I tried to use ublox U-Center v8.1 without success (although that program works fine in generic NMEA mode on a different model GPS). Thanks for any advice! -John Beale n8juf ___ 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] ADEV ScaleFactor correction
1/sqrt(7) = 0.37796... sqrt(2)/2 = 0.707... -Chuck Harris Tom Van Baak wrote: The 1.4 scale factor correction worked Nice confirmation. The actual number is sqrt(2). Look at the definition of ADEV (http://tf.nist.gov/images/adevfreq.gif) to see why. Note sqrt(2) = 1.414 and 1/sqrt(7) is 0.707. The rule-of-thumb is that ADEV(tau 1 day) is 0.707 the daily drift rate; which is to say the daily drift rate is 1.414 ADEV(tau 1 day). /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. ___ 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 GPS chips on Indegogo
It's ok, even preferred, to use real URL's (many of us don't make a habit of clicking on t.cn links). The link is: http://www.indiegogo.com/projects/navspark-arduino-compatible-with-gps-gnss-receiver /tvb - Original Message - From: "Alberto di Bene" To: Sent: Thursday, January 16, 2014 3:28 AM Subject: Re: [time-nuts] New GPS chips on Indegogo > Don't know what happened... my previous message was relayed with an almost > empty body... > Here it is again. > > 73 Alberto I2PHD > > = > > On 1/14/2014 8:05 PM, lstosk...@cox.net wrote: > >> /This isn't drawing lots of attention, but really looks promising: >> >> //http://bit.ly/1dBpits// or//http://t.cn/8FvCEX7// >> >> Regular GPS or Chinese version or RAW. The first two presently Arduino >> compatible. >> >> For not much money. >> >> Hope it gets funded./ > > What happens with those fund raising projects if the goal is not reached ? > Do you receive your money back, or you must consider it a lost bet ? > > 73 Alberto I2PHD ___ 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 GPS chips on Indegogo
Don't know what happened... my previous message was relayed with an almost empty body... Here it is again. 73 Alberto I2PHD = On 1/14/2014 8:05 PM, lstosk...@cox.net wrote: /This isn't drawing lots of attention, but really looks promising: //http://bit.ly/1dBpits// or//http://t.cn/8FvCEX7// Regular GPS or Chinese version or RAW. The first two presently Arduino compatible. For not much money. Hope it gets funded./ What happens with those fund raising projects if the goal is not reached ? Do you receive your money back, or you must consider it a lost bet ? 73 Alberto I2PHD ___ 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] ADEV ScaleFactor correction
> The 1.4 scale factor correction worked Nice confirmation. The actual number is sqrt(2). Look at the definition of ADEV (http://tf.nist.gov/images/adevfreq.gif) to see why. Note sqrt(2) = 1.414 and 1/sqrt(7) is 0.707. The rule-of-thumb is that ADEV(tau 1 day) is 0.707 the daily drift rate; which is to say the daily drift rate is 1.414 ADEV(tau 1 day). /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.
