Specifications
R2 Lite UHF Internal Modem Board Details (Optional)
9-6
P/N: 1023998-01
R2 Lite UHF Internal Modem Board Details (Optional)
Table 9-2 lists HiPer VR’s optional R2 Lite UHF modem specifications.
General Recommendation for Highly Reliable Radio
Links
1. Maintain the use of Forward Error Correction (FEC) when in challenging radio environments such
as urban areas. FEC is the default option in the R2 Lite radio modem firmware.
2. Use Received Signal Strength Indication (RSSI) to measure the radio environment before using
GNSS receivers on a job site. RSSI values are available to our end users through our GNSS field
application software, and is an integral part of all GNSS systems. For more sensitive job sites like
airport construction, our customers and professional service team members are trained to use a
spectrum analyzer and other typical radio tools to ensure that the environment is free from radio
signal jamming or interference.
3. Co-operation with the local radio governing authorities to find out the optimum free radio
channel.
4. Avoid using channels nearby local TETRA or television frequencies, which are generally not
recommended for use in this application.
5. Use a repeater in an intermediate position, to extend the length of the link and/or increase the
receive signal level at the rover.
Table 9-2. R2 Lite UHF Internal Modem Board Specifications
Item Specification
Operating Frequency
Range
406 – 470 MHz for Rover and Base
Channel Spacing
6.25 KHz
a
/12.5 KHz/25 KHz user-selectable
a. 6.25 KHz Channel Spacing approved for Australia only.
Signal Modulation •4FSK
•GMSK
Communication Mode Time division duplex
Supported Protocol(s) TPS, PDL, Trimble, Satel 3AS
Transmitter Carrier Power 100, 200, 500 and 1000 mW, user selectable
Receiver Sensitivity
GMSK: -115 dBm @ 10
-5
BER and 12.5 KHz spacing
4FSK: -106 dBm @ 10
-5
BER and 12.5 KHz spacing
Receiver Dynamic Range -110 to -10 dBm
Serial Data Rate 115200 bps
Radio Data Rate 25 KHz: 9600 bps for GFSK and 19200 bps for 4FSK
12.5 KHz: 4800 bps for GMSK and 9600 bps for 4FSK
Antenna Type Whip antenna
Antenna Connector BNC
Error Correction FEC on/off
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