User's Manual

105 Radio/Serial Telemetry Module User Manual
Page 46 © March 2000
Single channel synthesised Direct frequency modulation
Frequency 405 - 490 Mhz 12.5 kHz channel spacing
Transmit power Adjustable 10 - 500 mW
Spurious emissions RX - <-57 dBm
TX - <-37 dBm
Frequency Stability +/- 1.0 kHz
Receiver Sensitivity 0.4uV at 12dB SINAD
Signal detect / RSSI -120 to -80 dBm
Expected line-of-sight range 2 km @ 10mW EIRP
5 km @ 100mW EIRP
10 km @ 500 mW EIRP
Range may be extended by up to 5
intermediate modules as repeaters
Aerial Connector Female BNC coaxial Protected by gas discharge surge
arrester
Radio Transceiver (905U)
Type Spread Spectrum Frequency Hopping
Frequency 902 - 928 Mhz 250 kHz channel spacing
Transmit power Adjustable 100 mW – 1 W
Spurious emissions RX - <-57 dBm
TX - <-37 dBm
Frequency Stability +/- 10 kHz
Receiver Sensitivity 0.4uV at 12dB SINAD
Signal detect / RSSI -120 to -80 dBm
Expected line-of-sight range 10 km @ 100mW EIRP
20 km @ 500 mW EIRP
Range may be extended by up to 5
intermediate modules as repeaters
Aerial Connector Female SMA Coaxial
Serial Ports
RS232 Port DB9 female DCE 9600 baud, no parity, 8 data bits, 1
stop bit
RS485 Port 2 pin terminal block 9600 baud, no parity, 8 data bits, 1
stop bit,
Typical distance 1km
Data transmission On change-of-state
+ integrity update
Update time configurable
Protocol - serial
- radio
asynchronous ARQ, with
16 bit CRC
synchronous ARQ
Automatic acknowledgments with up
to 4 retries
Communications fail status May be mapped to local or Resetting of outputs on comms fail