NMX920 OEM Integrators Guide
Page 18 of 21
9. Technical Specification
Radio Transceiver Specification
General
Dual conversion receiver, directly modulated transmitter utilising common
antenna and solid state transmit/receive RF switch.
Modulation Technique
NRZ GMSK (BT=0.3)
Transmitter Frequency Range
895 – 905 MHz (800 channels)
Receive Frequency Range
931 – 941 MHz (800 channels)
Channel Spacing
12.5 kHz
Frequency Accuracy
±
1.2 kHz over full operating temperature range
Receiver Sensitivity
-116 dBm
Transmitter Power (typical)
2 W @ 6.5 – 7.5 VDC into matched 50
Ω
antenna load at 20
°
C
Transmitter Power Control
4 level transmit power control (0, -6dB, -12dB and –18dB)
Antenna Cable Connector
MMCX Female
Environmental Specification
Operating Temperature
-10
°
C to +55
°
C
Storage Temperature
-35
°
C to +80
°
C
Cooling Method
Convection and thermal conduction of an enclosed environment
Operating Humidity
5% to 95% non-condensing relative humidity at +50
°
C for at least 8 hours
Physical Specification
Overall dimensions
100 mm x 55mm x 12 mm (standard enclosure) including connectors and
mounting lugs
Weight
70 g including standard enclosure
Mounting Method
M2 Screws at 3 positions
Housing
High density metallised plastic and stainless steel
Grounding
Continuous-edge pressure fit grounding from case to PCB
Power Requirements
Supply Voltage
6.5 – 7.5 VDC
Supply Ripple
Less than 35mV rms
All modes – Transmitting high power
1700 mA (typical) @ 7.0 VDC into matched 50
Ω
antenna at 20
°
C
Express Mode – Receiving
100 mA (typical) @ 7.0 VDC into matched 50
Ω
antenna at 20
°
C
Battery Saving Mode – Receiving
45 mA (ave) (typical) @ 7.0 VDC into matched 50
Ω
antenna at 20
°
C
Power-off Mode
250 uA (typical) @ 7.0 VDC
Device Interface
Connector
30-way 0.50 mm pitch FPC socket, or 2 x 15 x 2mm Board to Board
Connector, or cable
Data link protocol
Mobitex® Asynchronous Communications Protocol (MASC1)
Data port
RS-232 or TTL (Manufacturing Option)
Data rate
1200 – 9600bps
Specifications Subject to change
