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POSITIONING SYSTEMS

GR-3 Operator’s Manual

Digital UHF Radio Addendum

Part Number 7010-0802

Rev. A

©Copyright Topcon Positioning Systems, Inc.

March, 2007

The information contained herein may not be used, accessed, copied, stored,

displayed, sold, modified, published, or distributed, or otherwise reproduced

without express written consent from Topcon.

ECO#2972

Terms and Conditions

Thank you for buying this Topcon product. This manual has been prepared to assist

you with the care and operation of the product and its use is subject to these Terms

and Conditions and those more fully set forth in the Operator’s/User’s Manual.

Usage and Safety

This product is designed for use by professionals. Always use safety precautions

when operating this or any Topcon product.

Copyrights

All information contained in this Manual is the intellectual property of, and

copyrighted material of TPS. All rights are reserved. You may not use, access, copy,

store, display, create derivative works of, sell, modify, publish, distribute, or allow

any third party access to, any graphics, content, information or data in this Manual

without TPS’ express written consent and may only use such information for the care

and operation of your Product. The information and data in this Manual are a valuable

asset of TPS and are developed by the expenditure of considerable work, time and

money, and are the result of original selection, coordination and arrangement by TPS.

Trademarks

TopNET CORS, TopNET-S, TopNET-R, HiPer, and Topcon are trademarks or

registered trademark of Topcon Positioning Systems, Inc. Windows and Outlook are

registered trademarks of Microsoft Corporation. InstallShield is a registered

trademark of InstallShield Software Corporation.

Other product and company names mentioned herein may be trademarks of their

respective owners.

Disclaimer of Warranty

EXCEPT FOR SUCH WARRANTIES AND LICENSES PROVIDED WITH THE PRODUCT,

THIS MANUAL AND THE PRODUCT ARE PROVIDED “AS-IS”. TOPCON AND ITS

DISTRIBUTORS SHALL NOT BE LIABLE FOR TECHNICAL OR EDITORIAL ERRORS OR

OMISSIONS CONTAINED HEREIN; NOR FOR INCIDENTAL OR CONSEQUENTIAL

DAMAGES RESULTING FROM THE FURNISHING, PERFORMANCE OR USE OF THIS

MATERIAL OR THE PRODUCT.

Please see the Operator’s/User’s Manual for detailed information on warranties and

the license agreement which may apply to the Product.

License Agreement

Use of any computer programs or software supplied by Topcon or downloaded from

the Topcon website in connection with the Product implies acceptance of the Terms

and Conditions here and in the Operator’s/User’s Manual.

Please see the Operator’s/User’s Manual for detailed information on warranties and

the license agreement which may apply to the Product.

P/N 7010-0802

TOC

Table of Contents

Chapter 1

GR-3 Digital UHF Radio Configuration ............... 1-1

Configuring the Radio Modem ........................................ 1-1

Configuring a Base/Rover Digital UHF

Radio Modem in PDL Mode ........................................ 1-2

Configuring a Base/Rover Digital UHF

Radio Modem in Simplex Mode .................................. 1-5

Configuring a GSM Radio Modem ................................. 1-9

Chapter 2

Troubleshooting ................................................... 2-1

Check This First! ............................................................. 2-1

Receiver Problems ........................................................... 2-2

Appendix A

Specifications ....................................................... A-1

Receiver Specifications ................................................... A-1

General Details ................................................................ A-1

Digital UHF Transmitter Specifications .......................... A-2

Digital UHF Receiver Specifications .............................. A-3

Table of Contents

GR-3 Operator’s Manual Addendum

Notes:

P/N 7010-0802

Chapter 1

1-1

GR-3 Digital UHF Radio

Configuration

The GR-3 receiver is a multi-frequency, GPS+ receiver built to be the

most advanced and compact receiver for the surveying market. The

following is an addendum to the GR-3 Operator’s Manual on

configuration of the Digital UHF radio modem for the Base and

Rover in PDL and Simplex mode and configuration of a GSM radio

modem.

Configuring the Radio Modem

Modem-TPS is Topcon’s radio modem configuration utility for

modems embedded in Topcon receivers.Modem-TPS (version 2.2 or

newer) provides the following functions:

• Connecting a computer to an integrated radio modem via a serial

port or Bluetooth wireless technology.

• Displaying information about the radio modem installed in the

receiver.

• Programming the radio modem’s settings.

Topcon’s configuration and surveying software, TopSURV or

Pocket-3D, also have the ability to configure Topcon receivers. Refer

to the TopSURV or Pocket-3D manuals for details.

GR-3 Digital UHF Radio Configuration

GR-3 Operator’s Manual Addendum

1-2

Configuring a Base/Rover

Digital UHF Radio Modem in

PDL Mode

For the GR-3 Digital UHF, the integrated radio modem provides

TX/RX UHF communications between a Base Station and a Rover.

To configure the UHF radio modem, have the following ready:

• PC running Windows 98 or newer

• Modem-TPS 2.2p0 or newer

• A Serial cable or Bluetooth connectivity with PC

1. Connect the computer and receiver using an RS-232 cable or

Bluetooth wireless technology. Turn on the receiver.

2. Open Modem-TPS and select the COM Port the receiver is

connected to (Figure 1-1). Click Connect.

Figure 1-1. Connect to Modem-TPS

3. On the Radio Link tab, set the following parameters (Table 1-1 on

page 1-3) for the Base and Rover’s radio modem in PDL protocol

and click Apply (Figure 1-2 on page 1-4).

NOTICE

To comply with RF exposure requirements,

maintain at least 25cm between the user and the

radio modem.

Configuring a Base/Rover Digital UHF Radio Modem in PDL Mode

P/N 7010-0802 1-3

Table 1-1. Receiver Parameters for the Radio Link Tab in Protocol Mode

Parameter Base Receiver Rover Receiver

Protocol Select PDL w/EOT. This is the default setting for the

GR-3 Digital UHF.

Modulation Select GMSK; recommended for most applications.

Mode Select Transmitter Select Receiver

Channel Select the current Transmit/Receive frequency channel in

MHz.

Assign a channel on which to transmit/receive data.

• Use the same channel for both the transmitter and the

receiver.

Forward Error

Correction (FEC)

Enable to maximize data communication. The rover radio

modem has the capability to check and correct

transmission errors (if any) in an incoming data stream.

See Notice on page 1-4 for more information on FEC.

Scrambling Enable to provide more robust data communication over

high interference areas.

Output power Select the transmission

power for the radio

modem (from 10 mW

to 1W).

n/a

Link rate Select 9600 as the link rate, which is the default link rate

for GMSK (recommended for most applications).

The link rate is the rate at which data is transmitted over

the RF Link.

For maximum efficiency, the data packet size transferred

to the radio modem in a given time should be equal to or

less than the link rate. Use Table 1-3 on page 1-8 to

determine the link rate.

GR-3 Digital UHF Radio Configuration

GR-3 Operator’s Manual Addendum

1-4

Figure 1-2. Apply Radio Link and Baud Rate Parameters

4. On the Serial Interface tab, select the following baud rate

parameters and click Apply (Figure 1-3 on page 1-5).

•Baud Rate – select a baud rate for the modem’s serial port.

The same rate must be used for the receiver and the modem.

•RTS/CTS – controls the flow of data between the receiver and

modem. “On” enables handshaking/hardware flow control.

5. When finished, click FileDisconnect.

6. Click FileExit to close Modem-TPS.

NOTICE

FEC reduces data throughput by adding redundant

check bits to the data stream. If using FEC with a

differential messages format that produce a great

deal of data, select a link rate of 19200 and a

modulation type of 4-level FSK to ensure reliable

radio communication between receivers.

NOTICE

If the serial baud rate exceeds the link rate, enable

hardware handshaking to prevent the radio link

from overflowing, resulting in data loss.

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