User's Guide

Page 6
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Intermodulation
Intermodulation products, caused by an interfering signal with the
same power as the transmitter isolated by 30 dB, are at least -40 dBc
at ≥±150 kHz and -50 dBc at ≥±500 kHz.
Transceiver Rx RF Characteristics
Sensitivity
118 to 136.975 MHz 12 dB SINAD for -107 dBm 30% modulated.
112 to 117.975 MHz 12 dB SINAD for -105 dBm 30% modulated
and
137 to 155.975 MHz
Notes ...
(1) All references to SINAD in this document include ITU-T recommendation P.53 weighting.
(2) When operating the transceiver in combined T/R antenna configuration, the sensitivity figures
are degraded by 1 dB.
Channel spacing
AM-Voice mode 25 kHz, or 8.33 kHz.
AM-MSK mode 25 kHz.
IF selectivity
For 25 kHz channel spacing 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 attenuated by more
than 80 dB.
For 8.33 kHz channel spacing At ±3.5 kHz from the centre frequency, the signal is attenuated by less
than 6 dB.
At ±8.33 kHz from the centre frequency, the signal is attenuated by
more than 70 dB (60 dB using the ETSI test method).
At ±25 kHz from the centre frequency, the signal is attenuated by more
than 80 dB.
Unwanted Signal Suppression
Intermod signal suppression The intermodulation signal suppression is 80 dB or greater (reference
12 dB SINAD) for two unwanted signals spaced 100 kHz
(unmodulated) and 200 kHz (30% modulation) from the channel
frequency.
Blocking ratio 95 dB or greater (reference 12 dB SINAD and degraded by 6 dB) in
the presence of an unmodulated unwanted signal spaced at 200 kHz
from the channel frequency.
105 dB or greater (reference 12 dB SINAD and degraded by 6 dB) in
the presence of an unmodulated unwanted signal spaced at 3 MHz
from the channel frequency.