User's Guide

Page 12
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Transceiver Rx RF Characteristics
Sensitivity
The transceiver has a sensitivity better than -102dBm for 1x10
-3
Bit Error Rate (BER) with Reed Solomon
Decoding off.
Channel Spacing
Mode 2 channel spacing is 25 kHz.
IF Selectivity
At ±11 kHz from the centre frequency, the signal is attenuated by less
than 6 dB.
At ±25 kHz from the centre frequency the signal is rejected by more
than 80 dB.
Unwanted Signal Suppression
With the required signal at -92 dBm, a BER of better than 1x10
-3
with
Reed Solomon Decoding switched off is achieved under the following
conditions:
❑ An interfering signal at -32 dBm on an adjacent channel
❑ One or more out-of-band interfering signals having a total level of
-33 dBm
❑ One or more VHF FM broadcast signals having a total level of
-5 dBm
❑ Co-channel rejection better than 20 dB.
Synchronisation
For received signals greater than -103 dBm, the probability of
synchronisation is greater than 0.999. The probability of false
synchronisation is 3x10
-3
Transceiver Rx Modulation Characteristics
Mode 2 uses Carrier Sense Multiple Access (CSMA) differentially
encoded 8-phase shift keying (D8PSK) using a raised cosine filter with
α = 0.6 (nominal value), emission designator 14K0G1DE.
Wanted Signal Dynamic Range (RF AGC)
A BER better than 1x10
-3
with Reed Solomon Decoding off is
achieved for received signals of -102 dBm to +10 dBm.
Frequency Offsets
The transceiver operates with frequency offsets up to 826 Hz.