Topcon Positioning Systems, Inc. 7400 National Drive Livermore, CA 94551 GR-3 MANUAL ADDENDUM FOR DIGITAL UHF RADIO A. Configuring a Base Station’s Digital UHF radio modem in PDL Mode Note: To comply with RF exposure requirements, maintain at least 25cm between the user and the radio modem. For the GR-3 Digital UHF, the integrated radio modem provides TX/RX UHF communications between a Base Station and Rover.
Topcon Positioning Systems, Inc. 7400 National Drive Livermore, CA 94551 • • • • • • • Protocol – Select PDL w/EOT. Modulation Type – the modulation for PDL protocol is GMSK. Link Rate – the default link rate for GMSK is 9600 and is recommended for most applications. The link rate is the rate at which data is transmitted over the RF Link. Mode – The Radio Operation mode. The GR-3 Digital UHF can be set to Transmit and Receive in PDL Mode.
Topcon Positioning Systems, Inc. 7400 National Drive Livermore, CA 94551 9. Click Apply, and then click on File-Disconnect. To close Modem-TPS, choose File-Exit. 10. Launch PCCDU and setup the receiver to run as an RTK Base station. B. Configuring a Rover’s Digital UHF radio modem in PDL Mode Note: To comply with RF exposure requirements, maintain at least 25cm between the user and the radio modem.
Topcon Positioning Systems, Inc. 7400 National Drive Livermore, CA 94551 • • • • • • Protocol – Select PDL w/EOT. Modulation Type – the modulation for PDL protocol is GMSK and is recommended for most applications. Link Rate – the default link rate for GMSK is 9600 and is recommended for most applications. The link rate is the rate at which data is transmitted over the RF Link. Mode – The radio operation mode. To set the radio as a base modem, select Transmitter.
Topcon Positioning Systems, Inc. 7400 National Drive Livermore, CA 94551 7. On the Serial Interface tab, select a baud rate for the modem’s serial port. The same rate must be used for both the receiver and the transmitter. The recommended baud rate is 115200. 8. On the Serial Interface tab, select the Ready to Send/Command to Send (RTS/CTS) to be ON. 9. Click Apply, and then click on File-Disconnect. To close Modem-TPS, choose File-Exit. 10. Launch PCCDU and setup the receiver to run as an RTK Rover.
Topcon Positioning Systems, Inc. 7400 National Drive Livermore, CA 94551 5. On the Radio Link tab, set the following parameters for the base station’s radio modem in Simplex Mode: • • • Protocol – Select Simplex as the protocol. This is the default setting for the GR-3 Digital UHF. Modulation Type – the default modulation for Simplex protocol is DQPSK and is recommended for most applications. Link Rate – the default for DQPSK is 19200 and is recommended for most applications.
Topcon Positioning Systems, Inc. 7400 National Drive Livermore, CA 94551 • • • Forward Error Correction (FEC) – Forward Error Correction should be checked for Simplex protocol. Channel – The current Transmit/Receive frequency channel in MHz. Output power – Select the level of power for RF transmissions from 10 mW to 1W. 6. After completing steps 1-5 in “Configuring a Base Station’s UHF Radio modem”, click on the Serial Interface tab. 7.
Topcon Positioning Systems, Inc. 7400 National Drive Livermore, CA 94551 1. Connect the computer and receiver using an RS-232 cable or Bluetooth wireless technology. 2. Turn on the receiver. 3. Open Modem-TPS and select the COM Port the receiver is connected to. 4. Click on Connect. 5. On the Radio Link tab, set the following parameters for the base station’s radio modem in Simplex Mode: • • • Protocol – Select Simplex. This is the default setting for the GR-3 Digital UHF.
Topcon Positioning Systems, Inc. 7400 National Drive Livermore, CA 94551 • • • Mode – To set the radio as a base modem, select Transmitter. The GR-3 Digital UHF in Simplex mode can be set as a Transmitter and Receiver. Scrambling – For Simplex protocol, disable the scrambling in Modem-TPS. Forward Error Correction (FEC) – For Simplex protocol, enable FEC in Modem-TPS. Channel – The current Transmit/Receive frequency channel in MHz 6.
Topcon Positioning Systems, Inc. 7400 National Drive Livermore, CA 94551 For the GR-3 Digital UHF, the integrated radio modem with a Wavecom GSM Module provides TX/RX GSM communications between a Base Station and Rover, or communications with a GPS network using IP based connections. To configure the GSM modems, have the following ready: • • • PC running Windows 98 or later Modem-TPS 2.1 or later Serial cable or Bluetooth connectivity with PC 1.
Topcon Positioning Systems, Inc. 7400 National Drive Livermore, CA 94551 • • • • • Signal quality is a reading of the strength of the GSM signal. The lower the number – the closer to zero 0 – the better the signal quality. The minimum signal cutoff is -111 dB. The Operator is the service provider on the SIM card inserted into the GR-3 Digital UHF The Model shows the model of the Wavecom module and the GSM band that it uses.
Topcon Positioning Systems, Inc. 7400 National Drive Livermore, CA 94551 base receiver • • I have no radio link between base and rover and the Rx/TX LED is flashing green on the rover. • • • • I have no radio link between base and rover and the rover RX/TX LED is solid green • • • • The RX/TX LED is flashing red on my receiver • mode, not transmit mode. Change this using the data collector software or Modem-TPS. The base is set into GSM mode.
Topcon Positioning Systems, Inc. 7400 National Drive Livermore, CA 94551 Transmission Rates at 12.5 kHz spacing Data Speed of Serial Interface Forward Error Correction Scrambling Communication Mode • D16QAM – 38400 bps • DBPSK/GMSK – 4800 bps • DQPSK/4FSK – 9600 bps • D8PSK – 14400 bps • D16QAM – 19200 bps Max 115200 bps Available Available Half-Duplex Digital UHF Transmitter Specifications Parameter Output Power Nominal Output Impedance Output Power Control Accuracy Specification 0.
