Appendix A
27
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T
ECHNICAL
S
PECIFICATIONS
FH915 DSP based integrated Spread Spectrum Modem is the single board OEM wireless transceiver
intended for SCADA, outdoor telemetry applications and transmission /receiving of differential
corrections and additional information by terrestrial radio channels between two GNSS receivers.
The Spread Spectrum module provides half-duplex communication with transmitter output power of 1 W
(+30 dBm) in the frequency band 902-928 MHz z. In 868-870 MHz band module provides half-duplex
communication with transmitter output power up to 1W (+30 dBm) with channel spacing 25.0/ 20.0/12,5/
6.25 kHz. It supports the following modulation methods: GMSK, 4FSK.
A.1. Technical Specifications
A.1.1. Radio Transceiver
Table A-1. Radio Transceiver Specifications
A.1.2. Radio Transmitter
Table A-2. Radio Transmitter Specifications
Component Details
Frequency Range
902-928 MHz (USA)
915-928 MHz (Australia)
868-870 MHz (EU) with 25/20/12.5 kHz CS
Link Rate, symbols/second
9600, 19200, 38400, 64000 (USA/Australia)
4800, 9600 (EU)
Carrier Frequency Stability
±1 ppm
Modulation GMSK/4FSK
Communication Mode
Half duplex, simplex, repeater
Component Details
Transmitter Output Power
+10... +30 dBm in 1 dB step / 50
(USA/Australia)
+10...+27 dBm in 1dB step/50
(EU)
