Specifications

SMX920 Base Station & Repeater Technical Manual
RELM/ BK RADIO
38
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: Within +1, -3 dB of 6 dB per octave curve.
De-Emphasis Accuracy: Within +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