54
MDS TransNET 900 I&O Guide
MDS 05-2708A01, Rev. B
RF CHARACTERISTICS (TNC RF Connector)
TRANSMITTER:
Power Output
(at antenna connector):
0.1 to 1.0 watt (+20 dBm to +30 dBm),
set by user
Duty Cycle:
Continuous
Modulation Type:
Binary CPFSK
Output Impedance:
50 Ohms
Spurious:
–60 dBc
Harmonics:
–55 dBc
RECEIVER:
Type:
Double conversion superheterodyne
Sensitivity:
–110 dBm
Intermodulation:
54 dB minimum (EIA)
Desensitization:
75 dB
Spurious:
70 dB minimum
Bandwidth:
200 kHz
Interference Ratio
(SINAD degraded by 3dB):
Co-channel:–10 dB
Adjacent c30 dB
Two channels away:+40 dB
Three channels away:+48 dB
Time Required to Synchronize
with Master Radio:
0.5 seconds (typical)
10.2 Diagnostic Interface Connections (RJ-11)
Invisible
place
holder
Figure 20. RJ-11 to DB-9 Adapter Cable—Wiring Details
NOTE:
Only wire pins 4, 5, and 6. Pins 1,2, and 3 are reserved for special functions
and are not normally connected.
10.3 Data Interface Connections (DB-9F)
The
DATA
) is used to connect the radio to an external
DTE data terminal that supports the EIA/RS-232 or EIA/RS-485 (balanced)
format, depending on how the radio was configured at the factory. The radio
supports data rates of 1200, 2400, 4800, 9600, 19200, 38400, 57600, and
115200 bps (asynchronous data only).
RXD
TXD
GND
2
3
5
DB-9 FEMALE
(TO COMPUTER)
TXD
RXD
GND
4
5
6
RJ-11 PLUG
(TO RADIO)
RJ-11 PIN LAYOUT
1
6
Содержание EL805
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