74 SD Series Technical Manual MDS 05-4846A01, Rev. D
7.3 Operating Constraints
The SD transceiver is a flexible unit offering a wide variety of features
needed in the industry today. While many system arrangements and
applications are possible, there are a few constraints that system plan-
ners should be aware of when designing a radio network. Table 16 lists
these constraints and explains how to avoid difficulty in operation.
Table 16. Operating Constraints
Constraint Detailed Information
Minimum Firmware Version
Requirement
When operating in “Packet w/ MAC” mode, do not
downgrade the firmware revision below REV400.
Downgrading firmware to a lower revision will
cause erratic and unpredictable behavior, including
causing the radio to become continuously keyed.
RSSI display in Strong
Signal Environments
The RSSI facility limits the maximum displayed signal
strength to –60 dBm.
DC Input Voltage (SD4) Early SD4 models supported 10.5 to 16 Vdc power, not
10 to 30 Vdc. Check the labeling above the power
connector to confirm the operating range for your unit.
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