2003 Revision
MX920 Base Station & Repeater
Technical Manual
8.4.4 Receive
Measured in accordance with TIA/EIA-603 standards.
Parameter
Specification
Sensitivity:
Better than –117 dBm for 12 dB SINAD.
Typical –120 dBm.
Selectivity 135-520MHz:
More than 85 dB for 25 kHz adj channel.
More than 75 dB for 12.5 kHz adj channel.
Spurious Resp:
Better than 80 dB.
Intermodulation:
Better than 80 dB.
Blocking:
Better than 100 dB at +/- 1 MHz point.
Co-Channel Rejection:
Better than 5 dB.
Distortion:
Less than 3% at 60% deviation.
S/N Ratio:
Better than 46 dB wide band.
Better than 42 dB narrow band.
Receiver Front End BW:
Equal to band allocation.
Audio Bandwidth VF output:
300 Hz to 3000 Hz, +1/-3 dB.
Receiver Audio Power
3 Watts nominal, 5 Watts peak.
Squelch Opening Time:
Less than 20mS @ 20dB SINAD.
Squelch Closing Time:
Less than 100mS.
Conducted Spurious:
Less than –57dBm.
Table 8-7 Receive Specifications
8.4.5 Ancillaries
Parameter
Specification
TX Timer:
Programmable, on / off selectable.
Pre-Emphasis Accuracy:
1, -3 dB of 6 dB per octave curve.
De-Emphasis Accuracy:
1, -3 dB of 6 dB per octave curve.
VF Compressor Range:
> 30 dB.
PTT Input:
+5V Logic active low.
Channel Select:
RS232 or BCD Pushwheel switches.
Repeater Tail Timer:
Programmable.
Table 8-8 Ancilary Specifications