User's Manual

05-4669A01, Rev. B MDS SD4 Startup Guide 15
NOTE: Additional information on Analog Mode operation (including
cable wiring details) is contained in the Reference Manual.
SPECIFICATIONS
GENERAL
Frequency Range*: MDS SD4: 330–512 MHz in one of 3
bands as follows:
Band 1—330 to 400 MHz
Band 2—400 to 450 MHz
Band 3—450 to 512 MHz
* Specific frequency authorizations are dependent on the type-approval of
radio. Consult the factory for details.
RECEIVER
Maximum Usable Sensitivity: –110 dBm at 1x10
–6
BER (Preliminary)
Bandwidth: 6.25, 12.5, 25 kHz
4INSleep Mode Input—Grounding this pin turns off
most circuits in a remote radio. This allows for greatly
reduced power consumption, yet preserves the
radio’s ability to be quickly brought on line. (See
Using the Radio’s Sleep Mode” for details.)
5--Signal Ground—Connects to ground (negative
supply potential) on chassis.
6 OUT Alarm Output (DSR)—An RS-232 high/space
(+5.0 Vdc) on this pin indicates an alarm condition.
An RS-232 low/mark (–5.0 Vdc) indicates normal
operation. This pin may be used as an alarm output.
(See Reference Manual.)
7INRTS (Request-to-Send)—Keys the transmitter.
8 OUT CTS (Clear-to-Send)—Goes “high” after the
programmed CTS delay time has elapsed (DCE), or
keys an attached radio when RF data arrives (CTS
KEY).
9 -- Reserved—User I/O for special applications
Table 5. COM2 Pin Descriptions—RS/EIA-232 (Cont’d)
Pin
Number
Input/
Output Pin Description