Trimble R750 MON Monitoring GNSS Receiver User Guide

GEOSPATIAL DIVISION
DECEMBER 2021
R750 – FREQUENTLY ASKED QUESTIONS

Features & Functions

What are the standard Geospatial R750 features?
When you purchase the Trimble® R750 GNSS receiver and activate it using Trimble Installation
Manager prior to assigning any configurations it will have the following features enabled as standard:

• Autonomous positioning capability (limited to 30 cm)
• GPS single frequency tracking (L1-C/A, L1C)
• L-Band tracking (MSS)
• 2.4 / 5 GHz Wi-Fi Access Point and Client
• Bluetooth
• Integrated worldwide 4G LTE modem
• GNSS observation data logging to 8 GB internal memory
• Built-in Spectrum Analyzer tool in web browser interface
• 5 Hz data logging and position update rate

What configurations & upgrades are available for the Trimble R750?
The following configuration and upgrade bundles are available for the Trimble R750. These can be purchased anytime, whether it be at the time of initial purchase or anytime thereafter. For complete details, contact your local Trimble  distribution partner.

• Trimble R750 Configuration Level Post-Processing Mode
• Trimble R750 Configuration Level Base Mode
• Trimble R750 Configuration Level Rover / Network Rover Mode
• Trimble R750 Configuration Level Base and Rover Mode
• Trimble R750 Upgrade Receiver Mode PP to Base
• Trimble R750 Upgrade Receiver Mode PP to Rover / Network Rover

What individual options are available for the Trimble R750?
Depending on the configuration bundle assigned to the receiver, standalone options can be added to a Trimble R750 receiver. For complete details, contact your local Trimble distribution partner.
Why does the R750 have fewer GNSS channels than its predecessor, the Trimble R9s?
Does this affect the performance of the receiver?
The Trimble R9s GNSS receiver included dual Maxwell 6 chipsets with a total of 440 channels, versus the R750 which has a single Maxwell 7 ASIC with 336 channels. Although this may seem like a regression, the Maxwell 7 ASIC supports newer GNSS signals—for example, BeiDou B1C—and as such the R750 will typically end up tracking and using a greater number of satellites than a receiver which has more channels but which is based on the previous generation ASIC. With its 336 channels, the R750 is capable of tracking up to 60 satellites simultaneously.
Is the Trimble R750 available with an integrated 450 MHz UHF radio?
At this time the R750 is not available with an integrated 450 MHz UHF radio. Customers who wish to use the Trimble R750 with a 450 MHz UHF radio will need to pair their receiver with a Trimble TDL 450Hx or TDL 450L external  radio.
Is the Trimble R750 supported by Trimble Pivot Platform for use as a network or CORS receiver?
At this time the R750 is not supported by Trimble Pivot Platform for use in VRS networks. However, the R750 is capable of being used as a constantly operating internet base station for single baseline RTK using any of the TCP/IP or  NTRIP Caster ports.
Does the Trimble R750 support Trimble ProPoint™ technology?
The Trimble R750 makes use of the ProPoint positioning engine when operating as a rover, regardless of correction type.
Although the Trimble R750 doesn’t technically make use of the ProPoint engine when operating as a base station, the Trimble CMRx correction message has been optimized for ProPoint enabled rovers.
How do Trimble xFill and Trimble xFill Premium work?
Trimble xFill is included in the R750 Rover / Network Rover mode and Base and Rover mode configurations. Trimble xFill Premium (xFill-RTX) is enabled by having a valid CenterPoint RTX (or CenterPoint RTX Fast) subscription on  the receiver. It uses the RTX correction stream via satellite to propagate the RTK position solution after the correction source for RTK is lost (typically through a loss of radio connection or internet connection). xFill requires <5 minutes to be initialized and ready. This means that RTK needs to be running for up to 5 minutes while the receiver is also getting the RTX correction stream before the xFill feature can be used. After losing the RTK correction stream, xFill will start  providing positions that slowly drift, and the receiver will cut it off at 5 minutes and drop to Autonomous in the absence of any alternative correction source.
If using xFill Premium, the receiver is processing both RTK and RTX positions simultaneously. When RTK is lost, the solution will transition to xFill, and then xFill Premium. The transition to xFill Premium occurs when xFill accuracy becomes worse than RTX accuracy, or at 10 minutes since RTK correction loss, whichever happens first. xFill Premium (xFill-RTX) positioning will continue until the RTK correction source is regained. The receiver’s position type will show “xFill”, or “xFill-RTX” (i.e. xFill Premium).
What Trimble CenterPoint RTX subscriptions are available for the Trimble R750?
The following Trimble CenterPoint RTX subscriptions are available for order through the Trimble Positioning Services (TPS) store or by contacting TPS Customer Care. A 30 day free trial is also available and can be redeemed at 30daytrial.trimble.com (Promotion Code: “FREE30”).

Accessories

What accessories come as standard?
The Trimble R750 (Geospatial) ships in a watertight transport case and includes a 45 W USB-C PD power supply with international plug adapters and a 2 meter USB-C to USB-C cable for charging, communications, and data transfer. A tripod mounting clip and screws are also included in the standard receiver kit.
What cables can be used to connect the R750 to an external UHF radio?
The following cables connect the R750 to an external UHF radio:

Power

How long will the R750 battery last with the 4G LTE modem transmitting?
When the R750 is used at room temperature and is fully charged the internal battery will last roughly 7 hours at 6.1 W. By connecting an external lead acid battery or USB-PD power bank to the R750 the battery life can be greatly extended.
If the battery is drained how long does it take to recharge?
Using the supplied USB-PD wall charger the R750 will take 4.8 hours to completely recharge to 100%.
It requires 3.5 hours with the same charging method to reach an 80% charge level.
Using an AC power supply the R750 requires 5 hours to completely recharge and 3.75 hours to reach an 80% charge.
If the battery is drained, is there an internal backup battery to save any base settings or will these all be cleared?
If the internal battery is completely drained the current settings are saved as Appfiles and therefore will be unaffected.
Does the R750 support Power Over Ethernet (PoE)?
No, PoE is not supported.
What USB external power pack is suitable for the R750?
A suitable power pack needs to be USB-PD (Power Delivery), have a type-C connector, and be capable of 15 V with at least 2 A. As a general rule it should be capable of at least 30 W output and support USB-C laptops with Power Distribution (most laptops require 15-20 V).
The following are examples of suitable power packs to support the Trimble R750:

• Anker PowerCore+ 26800 (larger capacity, not IP rated)
• Goal Zero Venture 75 (smaller capacity, IP67 dustproof/waterproof)

My 5 V USB-C power bank goes into ‘Sleep’ mode and does not get used
We do not recommend using 5 V power banks (see above). This behavior is controlled by the power bank itself. Some manufacturers’ packs go to sleep if there is no current draw. It is possible for the receiver to intermittently use power  from the pack, but this is neither elegant nor error-free. The recommendation is not to use a 5 V USB Type-C power bank and to instead use a power bank with specs similar to those listed above.
What accessories are required to power the R750 from an AC source?
Customers who wish to power the R750 from an AC source (other than the included USB-C PD charger) will need to purchase either a multiport adapter (P/N 57168-SUR) or cable (e.g., P/N 59044) to pair with the standard, country- specific Trimble AC power supply (P/N 101071-00-XX).

What cables are available for powering the Trimble R750 from a DC source?
The following table describes the most commonly used configurations for powering the Trimble R750 from a DC power source based on which physical port is used for this purpose:

• Battery – Lead Gel, External, with Plastic Shell & 2.4m Cable, 6Ah, 05/7P/M Straight Lemo [P/N 32364-10]
Lemo| Direct connection from R750 to external 35 Ah lead acid battery:
• Cable – Power, 3m/10ft, LMO to Battery Clips [P/N 46125-20-SUR] OR
• Cable – Data/Power, 1.5m, DB9(F) to 05/7P/M to SAE [P/N 59044-10-SUR] • Kit, 12V/35000 mAh Battery in Pouch – For 450 Radios [P/N 56657-00]
Lemo| Paired with TDL 450 UHF radio and external 35 Ah lead acid battery:
• Cable – TDL 450 / HPB450 (05/1S Lemo; SAE Power) [P/N 66656-10] • Kit, 12V/35000 mAh Battery in Pouch – For 450 Radios [P/N 56657-00]
DB26| Direct connection to external 35 Ah battery:
• Cable – Data/Power,0.5m,DB26(F) to DB9(F)/DB9(M)/RJ45(F)/BNC/SAE [P/N 78235-10-SUR] • Kit, 12V/35000 mAh Battery in Pouch – For 450 Radios [P/N 56657-00]
USB-C| Direct connection to aftermarket external USB-C PD power bank:
• TSCS/RGRS USB C to USB C [P/N 121920-01 (included with R750 packout kit)]

GNSS Antennas

What is the recommended GNSS antenna for use with the Trimble R750?
The Trimble Zephyr 3 Base is the recommended antenna for the R750 when used as an RTK Base station. Likewise, the Trimble Zephyr 3 Rover is the recommended antenna for the R750 when used as a rover.
Cellular Modem and SIM Card
Where is the nano SIM Card slot located on the Trimble R750?
The nano SIM card slot for LTE connectivity is located on the bottom of the R750 and a Phillips #1 screwdriver is needed to access it. Once both screws are removed a nano SIM from most cellular providers can be inserted.
Can I change the nano SIM card when the R750 is turned on?
It is best practice to ensure the R750 is turned off before removing the nano SIM card. When rebooted the R750 will obtain all details of the new SIM such as the ICCID.
How can I access the R750 remotely when it only has internet connection over LTE?
For outgoing connections over LTE—such as a data stream to an NTRIP server or an email notification—there is no special configuration required. However, incoming connections for remote management will require a publicly routable static IP address; this is usually a special order from your cell provider, if offered.
NOTE: For high security applications, Trimble recommends using a firewall in front of the R750. Note that the R750 supports HTTPS Connections (these are recommended).
What cellular providers/networks support the R750?
The R750 internal LTE modem supports global cellular service providers using the following bands:

• Twelve Bands FDD-LTE: 700, 800, 850, 900, 1700/2100 (AWS), 1800, 1900, 2100, 2600 MHz (bands 1, 2, 3, 4, 5, 7, 8, 12, 18, 19,20, 28)
• Seven Bands UMTS (WCDMA/FDD): 800, 850, 900, 1700/2100 (AWS), 1800, 1900 and 2100 MHz (bands 1, 2, 4, 5, 8, 9, 19)
• Quad Band GSM: 850, 900, 1800, and 1900 MHz

NOTE: Verizon (USA) is currently not supported.
How do I determine my SIM card settings—APN, Username and Password?
For a user-provided SIM, contact your cellular service provider.

R750 Provisioning

How do I provision options to my R750?
Purchased options and upgrades can be assigned by a Trimble distributor to the R750 via the Trimble Virtual Warehouse.
The Trimble distributor or end user can connect the R750 to a PC running Trimble Installation Manager using a USB-C or serial cable to:

• Load the standard options and activate the factory warranties (if this is the first connection)
• Install assigned options and upgrades
• Check the current firmware version and install the latest version if eligible

Data Logging

Can I log raw GNSS data for post processing?
The Trimble R750 includes Data Logging as a standard option. The internal memory has 8 GB available for raw data logging using .T02 or .T04 data file formats.
Can I log raw data to an external USB drive?
Yes, GNSS raw data can be logged to a FAT32 formatted USB-C drive with a single partition (Exfat or NTFS will not work).

R750 MON Monitoring GNSS Receiver
What version of Trimble 4D Control supports the R750 and R750 MON receivers?
The R750 and R750 MON are supported in Trimble 4D Control v6.2 and greater.
What is the difference between the R750 and R750 MON?
The R750 MON is a single configuration that allows the receiver to be used with Trimble 4D Control for automated monitoring projects. The receiver can be purchased in a pre-configured or unconfigured state.
Note: When purchasing an R750 MON, only a R750 MON configuration (P/N R750-CFG-001-45) can be applied to that receiver. An upgrade can be purchased and applied to the receiver which will convert the receiver from an R750  MON to an R750 Base and Rover.
What options are available for the R750 MON?
The R750 MON has one configuration (R750-CFG-001-45) which includes the following options. Other options are not available for this receiver configuration.

• Trimble R750 Option – Triple Frequency Tracking
• Trimble R750 Option – SBAS
• Trimble R750 Option – QZSS
• Trimble R750 Option – GLONASS
• Trimble R750 Option – BeiDou
• Trimble R750 Option – Galileo
• Trimble R750 Option – NavIC (IRNSS)
• Trimble R750 Option – Rover / Network Rover
• Trimble R750 Option – NMEA outputs
• Trimble R750 Option – 50 Hz
• Trimble R750 Option – 1 PPS output

Can I upgrade an R750 MON to an R750 receiver configuration?
The R750 MON configuration can be upgraded to a standard R750 Base and Rover configuration using the upgrade code R750-UPG-001-65. An R750 cannot be upgraded to an R750 MON. This can

Known Issues

USB-C power connection not recognized after firmware upgrade
After completing a firmware upgrade, it is possible that the USB-C connection may not be recognized until the USB-C cable is removed and reinserted.
More Information
For more information, contact your local Trimble regional sales manager.

References

• Trimble RTX 30 Day Demo Site For Geospatial and Construction Customers
• Trimble Identity
• Venture 75 – Goal Zero

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