2 or 5 Hz Base Transmission

[Jim Campi]

Hi Matt,

I tested the 5 hz option in my driveway today. The only parameter I changed was the base transmission rate, through the set-up screen, to 0.2 seconds.

I use the 1 watt radio. I'm guessing I used the instrument for about 30 minutes. The radio wasn't the slightest bit warm and the Tx light on the radio was blinking faster than 1/sec but no where near solid. When I glanced at it after the LS and T2 connected, it appeared to blink at about 2 hz. I didn't think much of it at the time, but now I am wondering if there is a change I need to make to the radio settings

Thouhts?

 

[Matt Johnson]

For 5 Hz to work correctly you will need to change the radio modulation to D16QAM. Jim I would also check that you have the 10 Hz option for your T2. You can check it with NetView.

 

[Michael Stazhkov]

When I was running the 5 hz(0.2 trans rate D16QAM mod type) the box in the action screen for fixed/float/standalone status was not keeping up with the fixed status in six pack screen ie the status box showed standalone even though all 6 fixed in 6 pack screen. I can collect a point with no issue as the software is using the actual fixed data shown in 6 pack screen but when staking out if the status box is showing standalone the bearing and distance to the staked point is based on a standalone solution. Also the VRMS box in collect or stake action screen is representing a standalone solution when the status box shows standalone. The fixed/float/standalone status box will show fixed at random intervals. I am using the version available under testing without the "code." Is this a known issue or maybe I am doing something wrong. BTW the 2 hz settings work very well, love the faster updates, even in extreme multipath its an animal!

Monte, could you record raw GNSS file during the issue and send it to us. Unfortunatelly I can't reproduce the issue in my conditions.

 

[Michael Stazhkov]

The problem with having standalone on the action screen solution button when RTK screen shows fixed solution can be reproduced if RTK Rate is 0.2 sec but actually correction is coming with 1 or 2 Hz. RTK rate should correspond to corrections rate, so in this case set RTK rate to 0.5 (Setup -> Advanced -> RTK/DGPS -> RTK Rate).

 

[Monte King]

Well I checked options on T2 and there is a 1 for update rate so obviously I do not have the option for faster rates. Sorry for the apparently dumb question, LOL!

Thank you

 

[Shawn Billings]

The best way I know to see what your actual RTK solution rate is, is to look at the V6 status screen (press the solution status button in the action screen). Every second, you should see the epochs increment by the actual received correction rate. At 2 Hz, you should see the counter increment by two's and at 5 Hz, you should see the counter increment by about 5 (I average about 4.3 or so).

 

[Jim Campi]

Monte,

I noticed precisely the same behavior. When I updated the LS software and ran the system at 2 hz, there was a significant increase in performance. When I updated to 5 hz I noticed the same behavior as you - unit indicating a fixed position via tone however; action screen describes STD.

I timed the TX rate on my radio and it was 1 hz. The setup screen also indicates a problem by describing the base update rate in red. I just checked the T2 in netview and I have the same option enabled - 1 hz.

So, I'm not sure what was behind the increased performance when I switched to 2 hz.

Waiting to hear back from Michael G now to purchase the 10 hz option for the T2...

 

[Jim Frame]

If you are using the 35 watt radio you probably need to use than fan with 5 Hz corrections if the output power is more than 4 watts.

Does the radio protect itself against overheating? What happens when it overheats?

 

[Matt Johnson]

Does the radio protect itself against overheating? What happens when it overheats?

Yes, I believe the radios stop broadcasting when they reach 85 degrees C.

 

[Steve Chatelle]

After verifying that the update rate for our T-2 was set for 1hz under the options tab in Net View, I updated my options from the internet just for the heck of it.

I now have an update rate of 10hz.

More great support from Javad.

 

[Jim Campi]

Indeed they do provide great support.

I have been testing over the weekend and am now also using the full 5 hz base trans rate.

For those that haven't experienced this update, the performance increase is as impressive as moving from a dial-up to broadband internet connection.

 

[Matt Johnson]

Everyone with the RTK option on their Triumph-2 has been given the 10 Hz option if they did not previously have it so everyone will just need to check or update their OAF before trying RTK rates faster than 1 Hz.

 

[Jim Campi]

Thank you again to Javad and all the staff. You could have collected a fee from each of us for this update - and it would have been easily justifiable on both sides. I would not have hesitated to purchase the option.

It's too early in the testing process to know this with any level of confidence however; my hope is to forego a total station upgrade. The additional base transmission rate has increased the effectiveness of the LS in areas with significant overhead or lateral obstructions such that it's far more efficient than using an optical instrument (in most cases). At 1 hz, many of the points in areas with obstructions eventually could be collected - it simply wasn't efficient or economical to use GNSS. In those scenarios I have been using an optical total station and crew. That all may have changed with this update...

 

[Adam]

If one is brodcasting at 2 hz with a the hpt35 radio turned down to say 2000-3000, would one have to worry about overheating or not having enough battery to make it thru 12 hours of work. I have the large battery pack. I do not have the fan accesory for the radio but would like to run the faster rtk rate. Would I need the fan for say 1000 on the radio and the 5 hz rtk for all day work. Considering summer time highs of 90-100F. Advice please?

 

[Clifton Keith]

You may want try the internet and not use the 35w radio.

 

[Adam]

I have a Verizon Mifi to connect to the interweb, to get on the local network. When broadcasting on the interweb, do you use the same type of connection, a wifi or hotspot. How do I set this up?

 

[Clifton Keith]

I have a Verizon Mifi to connect to the interweb, to get on the local network. When broadcasting on the interweb, do you use the same type of connection, a wifi or hotspot. How do I set this up?[/QUOTE
I have 2 jetpacks. You need to talk to John Evers. He is the man about this. You will really like the internet connection!

 

[Adam]

For 5 Hz to work correctly you will need to change the radio modulation to D16QAM. Jim I would also check that you have the 10 Hz option for your T2. You can check it with NetView.

I noticed that the emmision designator is different for the d16qam modulation. Will a modification to FCC licenses be needed to run the 5hz rate?

 

[Jim Frame]

I tried running at 2 Hz today. I had my radio set at 10 watts. It worked great -- for about 20 minutes, then I stopped getting corrections. I drove back to the base and found the radio on but not transmitting. I power-cycled it, reconnected the base and took off again. I got another 20 minutes or so, but then stopped receiving corrections again. Drove back to the base, same thing. I'm assuming the radio overheated and stopped transmitting, them entered some sort of zombie state.

I power-cycled and reconnected, but reconfigured for 1 Hz and 35 watts so I could get my work done.

It was a cool day, about 65°F, so I'm surprised that overheating was a problem, but I can't think of any other reason for the radio to shut itself down.

 

[Adam]

Jim, I too had that issue when trying to use faster than 1 update rate over UHF. It happened using .5 and .2 rates. It was a cool day and the radio was not hot to touch when I returned. I have swapped over to a tcp connection and it works great. I would like to get it working over UHF too.