TM8100 Mobile Radio Calibration Application User’s ManualChanging maximum deviation and squelch
thresholds 15
August 2004 © Tait Electronics Limited
Changing maximum deviation and squelch
thresholds
The Deviation/Squelch form contains text fields for entering in values that
require no test equipment. You can enter different values here for parameters
such as the squelch (carrier) mute opening points, the scanning RSSI
threshold level, and signalling deviation levels.
These settings should only be adjusted for special system requirements. See
“Calibrating the radio” on page 9 for more information.
Deviation Settings tab
Tx Peak Deviation Sets the maximum transmit deviation for narrow, medium, and wide band
channels. Each value can be changed from 0 to 7000Hz for specific system
requirements.
The default values are:
■ first row: 2500Hz (for channels with a bandwidth of 12.5kHz)
■ second row: 4000Hz (for channels with a bandwidth of 20kHz), and
■ third row: 5000Hz (for channels with a bandwidth of 25kHz).
Rx Peak Deviation Sets the maximum receive bandwidth for narrow, medium, and wide band
channels. Each value can be changed from 0 to 10085Hz for specific system
requirements.
The default values are:
■ first row: 2500Hz (for channels with a bandwidth of 12.5kHz)
■ second row: 4000Hz (for channels with a bandwidth of 20kHz), and
■ third row: 5000Hz (for channels with a bandwidth of 25kHz).
Signalling Deviation Sets maximum transmit deviation levels for non-voice signalling on the
radio. Each value is a percentage of the equivalent voice deviation level (Tx
Peak Deviation and Rx Peak Deviation), and can be changed within certain
limits above or below the default value for specific system requirements.
Recommended ranges and defaults are:
■ Selcall: 40 to 80% (default 60%)
■ DTMF: 40 to 80% (default 60%)
■ DCS: 10 to 25% (default 15%)
■ CTCSS: 10 to 25 % (default 12%)
■ FFSK (1200 baud modem): 40 to 80% (default 60%)
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