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4-WIRE CONNECTIONS
TXD +
2
3
RXD +
7
RXD –
8
TXD –
SPECIFICATIONS
GENERAL
Frequency Range*:
* Specific frequency authorizations are dependent on the type-approval of
radio. Consult the factory for details.
RECEIVER
Maximum Usable Sensitivity:
Bandwidth:
TRANSMITTER
Carrier Power:
Duty Cycle:
Output Impedance:
Channel Spacing:
FCC Emission Designators:
12.5 kHz B/W:
25.0 kHz B/W:
DATA CHARACTERISTICS
Signaling Type:
Data Interface Rates:
Data Latency:
05-4669A01, Rev. A
RXD +
RXD –
TXD +
TXD –
Figure 11. EIA-422/485 Wiring Schemes
(Left: EIA-422, Right: EIA-485)
Invisible place holder
TXD +
2
3
RXD +
7
RXD –
8
TXD –
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
–110 dBm at 1x10
12.5, 25 kHz
0.1 Watts to 5 Watts
Continuous
50 Ω
12.5, 25 kHz
11KOF1D, 11KOF2D, 11KOF3D
23K4F1D, 23K4F2D, 23K4F3D
EIA/RS-232; DB-9 Female connector
300–115200 bps, asynchronous
10 ms maximum
MDS SD4 Startup Guide
2-WIRE CONNECTIONS
RXD+/TXD+
RXD–/TXD–
–6
BER (Preliminary)
15
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