Trimble UHF Protocols

nusouthsc

Active Member
Hi all,
I am in the process of setting up an SP85 base to run UHF corrections with an LS+ rover. The JAVAD has a ton of different protocols and I am wondering if anyone has experience using Spectra/Trimble for multi-constellation? I am totally unfamiliar with Trimble protocols. I got “Transparent with EOT Timeout” to work with 4PSK modulation and it seems to work ok from my short experience. My main thing is I want to be using a more updated protocol for multi constellation. Any input is appreciated.
 

Artur Petrosyan

Member
JAVAD GNSS
Hello,
Please describe in more detail what you mean by "more updated protocol and multi-constellation".

We would like to know the following parameters for radio modem
1. protocol
2. modulation type (GMSK, 4FSK, 8FSK, 16FSK and so on)
3. channel spacing (12,5, 25 kHz ... )
4. data rate (9600, 19200...)

best regards,
Artur Petrosyan
 

nusouthsc

Active Member
Artur,
Thank you for the response. I have attached a screenshot of the available ADL Compatible Protocols.
Which of these is recommended for multi-constellation? On my SP85 unit I have the ability to broadcast all of them and I am not sure which is best. Thank you for your help.

1654281764863.png
 

Artur Petrosyan

Member
JAVAD GNSS
Hello,
thank you for the information, our radio modems support TrimMark3, TrimTalk 450S, TrimMark ||/IIe, TT450S(HW), Transparent with EOT timeout protocols and GMSK modulation

best regards,
Artur Petrosyan
 

nusouthsc

Active Member
Hello,
thank you for the information, our radio modems support TrimMark3, TrimTalk 450S, TrimMark ||/IIe, TT450S(HW), Transparent with EOT timeout protocols and GMSK modulation

best regards,
Artur Petrosyan
Artur,
Do all of these support multi-constellation?
 

TonyC

Member
The way I understand it, the limiting factor is the narrow banding. There is not enough bandwidth available to push the entire RTCM3.2 message string. While your base may be tracking 30+ SV's it might only be able to send half the data to your rover. Transparent with EOT timeout and 4FSK seems to give the maximum baud rate.
 

nusouthsc

Active Member
The way I understand it, the limiting factor is the narrow banding. There is not enough bandwidth available to push the entire RTCM3.2 message string. While your base may be tracking 30+ SV's it might only be able to send half the data to your rover. Transparent with EOT timeout and 4FSK seems to give the maximum baud rate.
Tony,
Thank you for the input. Thats what I was looking for. Those are the settings I am currently running and it seems to be decent. There are a few SVs the 85 doesn’t track so the variety count is a little low (1.5ish). The units only 3 years old and Im trying to still keep it in the fleet as a base during the summer. I just wanted to see if you could help me along. I appreciate the info.
 

Artur Petrosyan

Member
JAVAD GNSS
Our radio modems support protocol Transparent with EOT timeout and 4FSK modulation. Please inform us also the link rate parameter.

best regards,
Artur Petrosyan
 
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