Saturday, February 4, 2023 satellites

On Saturday morning, 2/4/23, I set up my T3 and connected my LS+ through UHF, set the base to an autonomous new point to DPOS later, got the green “fix” and was set to go. All standard procedure, no apparent issues.

I set my point collect method in the LS+ to “precise topo” and hit the start button on my first point. The familiar “tok-tok“ point measuring sound went on for over 300 epochs, and past the Javad “DPOS” sound at 300 epochs. Usually, in dense cover, this is not so unusual, but I was in a wide open field with overhead power lines about 200 feet away, and the base station on a 2-meter tripod about 800 feet away on an open rise near a residence. Puzzled, I changed point collect method to my renamed “open” style included In the recent J-field update. Typically, with fixed signal, I get two epochs and I have a very fast solution. It took 45 epochs before I got the Javad “finished“ sound. I tried the new renamed “canopy” point collect style with the same effect as “precise topo“ style - over 300 epochs befor I finally got a fixed solution. I was running in autonomous mode and was only collecting points in an open field - something I do frequently with no problems unless I create one.

I then noticed that I was tracking only 14 satellites instead of the full constellation. I typically get around 28 or more satellites in open country like this. I took about 75 location shots from about 10 am to past noontime, each one using the new “open” point collect style and each shot taking about 45 epochs to complete in an open pasture.

Did anyone else notice anything unusual in the field on Saturday? I am going back out Sunday afternoon to collect a few more points and see if it happens again. I will check back with you guys late this evening.
 

Michael

Active Member
Nate, we use cell exclusively. Is clearing the NV ram something that should be done routinely on the base for best performance. Mike
 
Day 2. Same scenario. Only tracking 12-13 satellites in wide open country. Back in pre-Javad days, I tracked 12-18 satellites with gps and glonass. How do I check to see if my rover is tracking all 4 constellations? T3 has all 4 listed. I am not sure how to read the LS+ screen. My shortcoming.
 
Well, part of the problem is solved. I had my general profile still set to a network rover profile using only gps and glonass. I finally found it when I clicked on the satellite icon on the home screen, and all I got was a blinking white screen. Had to shut off and start again. That's when I discovered the general profile was not set to uhf.

I do not understand why/how I was able to get solutions through DPOS with the wrong general profile setting and no wifi connection. I am still learning this system. The satellite icon says 31 satellites available, but I am still tracking either 6 or 12 satellites, sometimes jumping to 14. With the correct general profile now set to UHF, it still takes about 45 epochs instead of 2 epochs on the new "open" point collection profile. Precise Topo takes over 300 epochs and keeps going. I believe that I still have something wrong.

I will be getting some knowledgeable help Monday morning from one of the grand meisters of Javad system JField software who is a very patient person in dealing with greenhorns.
 
ol' Fat Fingers here..........
FYI for everyone. If something doesn't work, check your settings.
My system: LS+ and T3 on UHF with the 4.0 software updates.
1. Modulation: My modulation somehow changed. It was reset back to D8PSK.
2. Period: It should be set to one second to pick up and work better. Mine was set to 2 seconds.
3. Frequency: My modulation somehow changed. It was reset back to 461.025 Mhz.

I am now tracking around 28 satellites again.

Hats off to Matthew Sibole for immediately spotting the problem and navigating through the changes.
I am up and running again. Thank you!
 
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