Motorola RDX SERIES RDU4100 - Manual (Page 33)

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To establish a proper two-way communication,
the channel, frequency, and interference
eliminator codes must be the same on both
radios. This depends on the stored profile that
has been preprogrammed on the radio:
1. Channel: Current channel that the radio is
using, depending on radio model.
2. Frequency: The frequency the radio uses to
transmit/receive.
3. Interference Eliminator Code: These codes
help minimize interference by providing a
choice of code combinations.
4. Scramble Code: Codes that make the
transmissions sound garbled to anyone
listening who is not set to that specific code.
5. Bandwidth: Some frequencies have selectable
channel spacing, which must match other
radios for optimum audio quality.
For details on how to set up frequencies and
CTCSS/DPL codes in the channels, refer to
“Programming Selection Mode” in page 36.