Re: [time-nuts] Lady Heather for homebrew GPSDO

Mark, Bob, > If you are going to a GPSDO interface, I would bite the bullet and recommend > the Trimble > TSIP / Thunderbolt commands. It has its warts, but has commands for doing > just about > anything a GPSDO should do. Doing a decent job would not be easy... Nobody > seems to > have

Re: [time-nuts] Lady Heather for homebrew GPSDO

Mark, I haven't had the time to look at the LH code yet, but is there a sort of natural interface that would most easily fit?  I'm speaking about both sides of the conversation: receiving data streams and sending commands.  It seems a bit strange to me that NMEA would be the preferred type of

[time-nuts] Lady Heather for homebrew GPSDO

If you are going to a GPSDO interface, I would bite the bullet and recommend the Trimble TSIP / Thunderbolt commands. It has its warts, but has commands for doing just about anything a GPSDO should do. Doing a decent job would not be easy... Nobody seems to have done a decent job emulating

Re: [time-nuts] Lady Heather for homebrew GPSDO

Hi Jim, A couple of years ago, I asked the group if there was a standard UI that I should use for the GPSDO that I was developing.  Everyone said no, just do what works.  I don't think it occurred to anyone, certainly not to me, just how big a role that LH plays in the world of GPSDOs.  So,

Re: [time-nuts] Lady Heather for homebrew GPSDO

Hi There are a pretty small number of things that a GPSDO worries about that are not in the standard NMEA data structures: 1) DAC 2) Temperature 3) Lock state 4) Time error 5) Maybe a “quality of lock” metric A lot of GPSDO’s put out more than that in their status messages. There is a lot of

[time-nuts] Updated GPS board for TS2100

Fellow time-trackers, I found myself having to replace our network time server this weekend, specifically with a "new"/used Symmetricom TS2100 'TymServe' unit. When I first got the 2100, it had the week rollover problem, of course. However, some creative web searching led me to

[time-nuts] HP Z3801a insights and progress.

Making serious progress on the ole basket case Z3801a. Somethings that may be helpful to others. Its easy to completely remove the 48 volt power supply and use a normal bench supply. Especially if you are not using the outer oven and have a bad ocxo. So all below without the ocxo and a TBolt 10

[time-nuts] Lady Heather Touch Screen Keyboard (was GALILEO online: any changes seen? (Mark Sims))

Mark Sims wrote: “BTW, I'm tweaking up the code for use with touchscreen (that emulate a mouse) displays. I have an on-screen keyboard working and am now optimizing the display formatting when used on tiny screens. I have it working quite well with the official PI touchscreen... a 7"

Re: [time-nuts] Temperature weirdness with Thunderbolt & Lady Heather 5

Hi Do you (or your assistant) have a cell phone? Where was it when the original issue occurred? Yes, it’s a bit of a long shot, but I *have* seen test data messed up by the phone in a tech’s pocket. We finally worked it out when the speaker on the test computer started chirping as the cell

[time-nuts] Lady Heather for homebrew GPSDO

Hi all, I have experimented with LH 5 just monitoring a GPS receiver and am very impressed with the results. As a next step, I would like to use LH to monitor a homebrew GPSDO, and I think it would be easier to modify the GPSDO firmware to emulate an existing device rather than customize LH to

Re: [time-nuts] FPGA based TDC (was: Time nuts, off line questions.)

Hi > On Dec 17, 2016, at 6:44 AM, Attila Kinali wrote: > > Hi Dan, > > Answering to the mailinglist, because I think it's of general interest. > > On Fri, 16 Dec 2016 08:41:37 -0500 > Dan Kemppainen wrote: > >> My question is in regards to the FPGA

Re: [time-nuts] A novel use of GPS multipath

Hi Mark, Here are a couple more novel and inspiring uses of GPS... 1) One can determine snow depth by monitoring the SNR of each SV: GPS Snow Depth http://xenon.colorado.edu/spotlight/index.php?action=kb=10 GPS Snow Sensing

Re: [time-nuts] A novel use of GPS multipath

On 12/16/16 9:54 PM, Mark Sims wrote: http://clasp-research.engin.umich.edu/missions/cygnss/docs/CYGNSS_FactSheet_October2014.pdf I wonder what the return signal strength of the reflected signals is? There's quite a few of these bistatic radar using GPS as illuminator things over the

[time-nuts] FPGA based TDC (was: Time nuts, off line questions.)

Hi Dan, Answering to the mailinglist, because I think it's of general interest. On Fri, 16 Dec 2016 08:41:37 -0500 Dan Kemppainen wrote: > My question is in regards to the FPGA and how the logic was configured. > I have not seen examples of asynchronous logic, as a

Re: [time-nuts] FPGA based TDC (was: Time nuts, off line questions.)

On Sat, 17 Dec 2016 12:44:55 +0100 Attila Kinali wrote: > > As I understand, the GP2x chips have a true ring oscillator, and it's > > period PLL'd to the main crystal. I'm not completely sure how control of > > the period of the ring oscillator is achieved, but I believe it's

[time-nuts] A novel use of GPS multipath

http://clasp-research.engin.umich.edu/missions/cygnss/docs/CYGNSS_FactSheet_October2014.pdf I wonder what the return signal strength of the reflected signals is? ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

[time-nuts] GALILEO online: any changes seen?

You could download the Heather v5 Windows installer from ke5fx.com or compile the source on Linux/PI/macOS/Windows. I upgraded the firmware on my Neo M8N to 3.01 using Ucenter. I think that it is the latest version. Ublox says 3.01 works with the "Q". BTW, I'm tweaking up the code for use