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Appendices | RS90 Operating Manual
Receiver
Intermediate frequency 1st 21.4 MHz
2nd 450 KHz
Sensitivity 12dB SINAD dBuV ≤-6 BuV
Squelch sensitivity ≤-4 dBuV
Spurious response rejection ratio ≥70 dB
Adjacent channel selectivity ≥70 dB
Intermodulation response ≥68 dB
S/N at 3KHz deviation ≥40 dB
Audio output power at THD 10% 5W (external speaker output)
0.5 W handset
Audio distortion ≤5%
Audio response +1 to -3 dB of 6 dB/octave from 300 Hz to 3 kHZ
Transmitter
Frequency error ±5 PPM
RF power Hi: 23 ± 2 W
Lo: 0.8 ± 0.2 W
Maximum deviation ± 5 KHz
S/N at 3 KHz deviation 40 dB
Modulation distortion ±3 KHz ≤5%
Audio response at 1KHz deviation +1 to -3 dB of 6 dB/octave from 300 Hz to 3 kHz
Spurious/harmonic emissions Hi/Lo <0.25 uW
Modulation sensitivity ≤20 mV
Transmitter protection Open/short circuit of antenna
Communications
Comm. port NMEA 0183 NMEA 0183, 4800 baud
Comm. port NMEA 2000 NMEA 2000
NMEA 0183 input (receive) RMC, GGA, GLL, GNS
NMEA 0183 output (transmit) DSC (for DSC call), DSE (for enhanced position).
AIVDM (AIS) 38400 Baud
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