40 SD Series Technical Manual MDS 05-4846A01, Rev. D
• RF Output Power (dBm)—The RF output power may be set between
20 and 37 dBm (0.1 to 5 watts) in 1 dB increments. The default
setting is 37 dBm. Full power is not required in many cases, and
lower settings will place less demand on the DC power supply
and reduce the chance of interference with other stations. Only
the power necessary to carry out reliable communications should
be used.
NOTE: In Band B (220-222) MHz MDS SD2 power is limited to 2
watts to meet regulatory requirements.
• 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.
4) Only available for SD2 with wide bandwidth hardware option.
Table 12. Modem Selection vs. Speed, Bandwidth & Sensitivity
Modem Type
Selection
OTA Speed
(bps)
B/W (kHz) Approximate
Sensitivity
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
4
65000 50.0 -104 dBm
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