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42
SD Series Technical Manual
MDS 05-4846A01, Rev. F
•
Modem Type
—This setting determines the over-the-air data speed
and bandwidth of the radio’s transmitted signal. All radios in the
network must use the same modem setting to communicate with
each other. The default setting is
Modem 9600
, but it may be set to
any of the selections shown in Table 12. The table also lists
modem sensitivity ratings for the various modems. Note that
some modem choices are limited based on the model purchased.
1) For MDS x710-compatible operation.
2) For ETSI compliance.
3) 3200 bps not applicable to SD4.
•
Transmit/Receive Frequency
—The receive and transmit frequencies
may be viewed or set here. If no frequencies have been entered,
the fields will be blank and the radio’s
PWR
led will flash, indi-
cating that an entry is needed. Frequencies
must
be entered for the
radio to operate. Consult your station license to determine the
authorized frequencies for your system, and enter them exactly as
listed.
Table 12. Modem Selection vs. Speed, Bandwidth & Sensitivity
Modem Type
Selection
OTA Speed
(bps)
B/W (kHz)
Approximate
Sensitivity
5
Modem 9600
1
9600
12.5
-112 dBm
Modem 4800
1, 2
4800
12.5
-112 dBm
Modem 3200
1, 3
3200
5.00
-108 dBm
Modem 9600M
1, 2
9600
12.5
-106 dBm
Modem 4800F
4800
6.25
-108 dBm
Modem 9600B
1
9600
12.5
-106 dBm
Modem 4800B
1
4800
12.5
-110 dBm
Modem BELL
1
1200
12.5
-110 dBm
Modem V23
1200
12.5
-110 dBm
Modem 19200N
19200
12.5
-100 dBm
Modem 19200E
2
19200
12.5
-96 dBm
Modem 9600N
9600
6.25
-98 dBm
Modem 19200
19200
25.0
-105 dBm
Modem 65000
65000
50.0
-104 dBm