Re: [time-nuts] ADEV ScaleFactor correction

2014-01-16 Thread Tom Van Baak
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;

Re: [time-nuts] New GPS chips on Indegogo

2014-01-16 Thread Alberto di Bene
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

Re: [time-nuts] New GPS chips on Indegogo

2014-01-16 Thread Tom Van Baak
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 dib...@usa.net To: time-nuts@febo.com

Re: [time-nuts] ADEV ScaleFactor correction

2014-01-16 Thread Chuck Harris
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

[time-nuts] talking to Synergy Systems SSR-6Tr (u-blox LEA-6T-0)

2014-01-16 Thread John Beale
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

[time-nuts] Trade for GPSDO

2014-01-16 Thread Dale Hardin
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

Re: [time-nuts] fast edge, rise time.

2014-01-16 Thread Bill Reed
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

Re: [time-nuts] L1/L2 GPS Receiver

2014-01-16 Thread Anders Wallin
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

Re: [time-nuts] talking to Synergy Systems SSR-6Tr (u-blox LEA-6T-0)

2014-01-16 Thread Paul
On Thu, Jan 16, 2014 at 10:16 AM, John Beale be...@bealecorner.com 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

Re: [time-nuts] talking to Synergy Systems SSR-6Tr (u-blox LEA-6T-0)

2014-01-16 Thread beale
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

Re: [time-nuts] L1/L2 GPS Receiver

2014-01-16 Thread Hal Murray
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

Re: [time-nuts] L1/L2 GPS Receiver

2014-01-16 Thread Magnus Danielson
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

Re: [time-nuts] New GPS module

2014-01-16 Thread lstoskopf
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