T3 external GNSS antenna

B

Brian Ray

Member
I'm installing a GrAnt-G5T external antenna at my office.
I see that the when I connect an external GNSS antenna to my LS+ that it will automatically switch to the external antenna and display EX in the collect and staking screens.

Will the T3 also do that when I connect the external GNSS antenna?
How do I make sure it does?

I don't want the base to use any signals but what the external antenna is receiving.
Thanks,
Brian
 
Eric Tweet

Eric Tweet

Active Member
That'll largely depend on the method you intend to use to set up the T3 as a base, but since it's stationary at your office, it's probably safe to assume you'll be able to connect to it using Net View & Modem.

Generally, though, by default the T3 will likely automatically select the external antenna if it detects it, just like the LS does. On that point alone, it should ONLY be using the external antenna in that situation.

That being said, on the "General" tab of the parameters page in Net View & Modem, you can choose to use External only (instead of Internal, or Auto). You can verify that it's using only the external antenna after setting the antenna source to External (and applying the settings with the green check mark!), by switching back to the "Info" panel where it will show you all the satellites in view. After that settles to a consistent number, disconnect the external antenna and take the T3 outside. You should see no satellites at all, inferring that the receiver is not using the internal antenna.

Beyond that, Net View & Modem will allow you to set up the reference configuration of your base, including choosing the antenna parameters (necessary for telling the receiver what type of external antenna is being used, and so forth), setting the reference position, choosing which messages you want to produce for your RTK needs, how you want to send them (including UHF, TCP, UDP, NTRIP, cellular configurations, and more!). Of course it will also let you perform static recording to your PC for any post-processing you want to do. The list goes on...
 
nusouthsc

nusouthsc

Active Member
Eric Tweet said:
That'll largely depend on the method you intend to use to set up the T3 as a base, but since it's stationary at your office, it's probably safe to assume you'll be able to connect to it using Net View & Modem.

Generally, though, by default the T3 will likely automatically select the external antenna if it detects it, just like the LS does. On that point alone, it should ONLY be using the external antenna in that situation.

That being said, on the "General" tab of the parameters page in Net View & Modem, you can choose to use External only (instead of Internal, or Auto). You can verify that it's using only the external antenna after setting the antenna source to External (and applying the settings with the green check mark!), by switching back to the "Info" panel where it will show you all the satellites in view. After that settles to a consistent number, disconnect the external antenna and take the T3 outside. You should see no satellites at all, inferring that the receiver is not using the internal antenna.

Beyond that, Net View & Modem will allow you to set up the reference configuration of your base, including choosing the antenna parameters (necessary for telling the receiver what type of external antenna is being used, and so forth), setting the reference position, choosing which messages you want to produce for your RTK needs, how you want to send them (including UHF, TCP, UDP, NTRIP, cellular configurations, and more!). Of course it will also let you perform static recording to your PC for any post-processing you want to do. The list goes on...
Click to expand...
Eric,
Are you familiar with how to set up NTRIP/Mount point services? We have 3 LS rovers we use with our office base with no problems. However, other brands of receivers don't play so nicely. I have looked through the settings but its a little daunting. I can't seem to find where you create a mount point in NetView & Modem.
 
B

Brian Ray

Member
Thanks guys, the auto detect was what I was hoping for.
We'll be using a T3 or LS+ as a base when we need one and depending on what's available.
Most of the time they'll all be in the field, but hoping this will help when it's difficult to find a safe place for the base near our office.

How far from the base do you think will still work well?
I seem to remember some issues people were having with RTPK over long distances?
 
T

TonyC

Member
nusouthsc said:
Eric,
Are you familiar with how to set up NTRIP/Mount point services? We have 3 LS rovers we use with our office base with no problems. However, other brands of receivers don't play so nicely. I have looked through the settings but its a little daunting. I can't seem to find where you create a mount point in NetView & Modem.
Click to expand...
You need to use Net Hub to setup NTRIP.
 
Eric Tweet

Eric Tweet

Active Member
Brian Ray said:
Thanks guys, the auto detect was what I was hoping for.
We'll be using a T3 or LS+ as a base when we need one and depending on what's available.
Most of the time they'll all be in the field, but hoping this will help when it's difficult to find a safe place for the base near our office.

How far from the base do you think will still work well?
I seem to remember some issues people were having with RTPK over long distances?
Click to expand...
There's quite a bit of literature out there on accuracy vs baseline length. You can get a general idea based on the datasheet for your receiver (4mm + 1ppm horizontal for an LS+). So generally "works well" will be determined by your desired accuracy. RTK is generally "good" within about 10-20km, and "can still work" at 30km.
 
Eric Tweet

Eric Tweet

Active Member
nusouthsc said:
Eric,
Are you familiar with how to set up NTRIP/Mount point services? We have 3 LS rovers we use with our office base with no problems. However, other brands of receivers don't play so nicely. I have looked through the settings but its a little daunting. I can't seem to find where you create a mount point in NetView & Modem.
Click to expand...
As TonyC mentioned, Net Hub is the way to go.

The general to-do list for that is: add a connection to the receiver, configure it, enable Net Hub to be an Ntrip Caster in the settings page, then add client accounts under the NTRIP Caster tab.

Of course to connect to it with a rover in the field, the computer you're using to set that up would also have to be accessible from beyond whatever LAN it's on too, whether by forwarding ports through the router, using a dynamic DNS service, or otherwise.

edit: I should also point out that there are NTRIP settings that can be accessed using Net View & Modem, under Networking > Client (where you can set the receiver to be a client or a server which sends data as a mount point to some other caster), and Networking > NTRIP Caster. I have no Idea how to do anything in the NTRIP Caster tab (presumably only applicable for some receivers).
 
Last edited:
nusouthsc

nusouthsc

Active Member
Eric Tweet said:
As TonyC mentioned, Net Hub is the way to go.

The general to-do list for that is: add a connection to the receiver, configure it, enable Net Hub to be an Ntrip Caster in the settings page, then add client accounts under the NTRIP Caster tab.

Of course to connect to it with a rover in the field, the computer you're using to set that up would also have to be accessible from beyond whatever LAN it's on too, whether by forwarding ports through the router, using a dynamic DNS service, or otherwise.

edit: I should also point out that there are NTRIP settings that can be accessed using Net View & Modem, under Networking > Client (where you can set the receiver to be a client or a server which sends data as a mount point to some other caster), and Networking > NTRIP Caster. I have no Idea how to do anything in the NTRIP Caster tab (presumably only applicable for some receivers).
Click to expand...
Thank you for the info. I will investigate and see what I can find out.
 
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