User's Manual

Appendix A
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SPECIFICATIONS
1. HPT225BT VHF Modem Specifications
The following sections provide specifications for the modem and its internal components.
1.1. General Radio Specifications
Table 1. General Radio Specifications
Parameter Specification
Operating Frequency Range
1
215-255 MHz (EU)
217-220 MHz and 220-222 MHz (USA)
217-218 MHz, 219-220 MHz and 220-222 MHz (Canada)
Channel Spacing
1
25/12.5/6.25 kHz (USA, Canada)
25/20/12.5 kHz (EU)
Data Rate (25/20/12.5/6.25 kHz
Channel Spacing)
9600/7500/4800/2400 bps – DBPSK/GMSK
19200/15000/9600/4800 bps – DQPSK/4FSK
28800/22500/14400/7200 bps – D8PSK
38400/30000/19200/9600 bps – D16QAM
System Gain for DBPSK
modulation (Antenna gain is not
included)
160 dB (for 25 kHz Channel Spacing)
162 dB (for 12.5 kHz Channel Spacing)
163 dB (for 6.25 kHz Channel Spacing)
Roaming Speed for DBPSK modulation 75 mph / 120 km/h
Modulation GMSK/4FSK/DBPSK/DQPSK/D8PSK/D16QAM
Nominal Impedance 50 Ohms
End to End delay 60 ms
Communication Mode Time Division Duplex (TDD)
Time Division Multiple Access (TDMA)
Maximum Distance Range 40 miles / 65 km
Serial port Serial (RS-232) up to 115200 bps.
Serial port configurable as RS-232 and
RS-422, or RS-485
USB USB 2.0 device port (12 Mbps)
Bluetooth Bluetooth V2.0 Class 2 supporting SPP Slave and Master
Profiles
Bluetooth Antenna External