Tait TM8100 User Manual

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Tait TM8100 User Manual Manual pdf 15 page image

TM8100 Mobile Radio Calibration Application User’s ManualChanging maximum deviation and squelchthresholds 15August 2004 © Tait Electronics LimitedChanging maximum deviation and squelchthresholdsThe Deviation/Squelch form contains text fields for entering in values thatrequire no test equipment. You can enter different values here for parameterssuch as the squelch (carrier) mute opening points, the scanning RSSIthreshold 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 tabTx Peak Deviation Sets the maximum transmit deviation for narrow, medium, and wide bandchannels. Each value can be changed from 0 to 7000Hz for specific systemrequirements.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 bandchannels. Each value can be changed from 0 to 10085Hz for specific systemrequirements.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 theradio. Each value is a percentage of the equivalent voice deviation level (TxPeak Deviation and Rx Peak Deviation), and can be changed within certainlimits 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%)