Operating Instructions Part 2

MDS 05-3624A01, Rev. B OEM Series™ I/O Guide 27
RECEIVER
Type: Double conversion superheterodyne
(45 MHz and 450 MHz IF)
Frequency Ranges (900 MHz): 928 to 960 MHz
Frequency Increments: 6.25 kHz (Standard)
5 kHz (Special)
Frequency Stability: 1.5 ppm, –30 to +60 degrees C
Spurious and Image Rejection: –70 dB
Sensitivity: 12 dB Sinad @ –116 dBm
Data Performance: 1 x 10
-6
@ –108 dBm (9600 bps)
1 x 10
-6
@ –111 dBm (4600 bps)
Intermodulation Rejection: –70 dB minimum
Selectivity: 50 dB typical at adjacent channel (EIA)
Bandwidth: 12.5 kHz
DATA INTERFACE
RS-232 through DB-25 Connector
Baud Rates at Interface Port: 1200, 2400, 4800, 9600, and 19200* bps
Over-the-Air Data Rate: 9600 bps
4800 bps
Data Latency: < 20 ms typical
DIAGNOSTICS
Self Test: Yes
Local RS-232 RSSI and Setup: Yes
4 LED Display: PWR, DCD, TXD, and RXD
PRIMARY POWER
Voltage: 10 to 16 Vdc through a 5.5 mm pin plug or 2-pin
MDS connector
RX Current at 13.8 Vdc (typical): 75 mA
TX Current at 13.8 Vdc (typical): 1.75 A @ high power (5W)
700 mA @ medium power (1W)
400 mA @ low power (250 mW)
Circuit Protection: 2 amp fuse, surface mount
Reverse Polarity Protection: Diode across primary input
* At 19200 bps, the radio operates in a buffered mode, storing 50 characters at a time.
6.2 Bench Testing Setup
Figure 13 shows a sample test setup that can be used to verify the basic
operation of transceivers in a shop setting. The test can be performed
with any number of remote radios by using a power divider with the
required number of output connections.