User's Manual

13-12 MTR3000 Programming and Tuning: Tuning Setup (Wireline)
13.5.5 Wireline Squelch Level Tuning
The Wireline Squelch feature is used to mute Wireline Tx audio when the audio level falls below a
designated threshold. The procedure in this section is used to set the nominal squelch threshold. An
additional hysteresis value can be added to the nominal squelch threshold by adjusting the “Squelch
Hysteresis” setting in the Wireline configuration options of the CPS tool.
The Wireline Squelch level is adjusted relative to the expected audio level for High Level Guard
Tone. This is true regardless of the Remote Control method selected. The expected level of High
Level Guard Tone is 6 dB above the “Test Tone” level used during the Wireline Transmit Level tuning
procedure of Section 13.5.4 on page 13-10.
13.5.5.1 Tuning Procedure
1. Connect the radio’s transmitter antenna port to the Communication Analyzer.
2. Power the base station/repeater from either an AC or DC source.
3. Apply a 1 kHz signal, at the desired squelch threshold, to the J6 Wireline backplane
connector terminals. Optimally, it is recommended to use the actual source which is used
during normal operation of the radio to provide the signal.
4. Launch the Tuner application and click the “Read” button to read the softpot values.
Note
This calibration procedure should be performed after adjusting the Wireline Transmit Level.
Refer to Section 13.5.4 on page 13-10.
Note
It is possible to set the Wireline Squelch threshold higher than the level of average voice.
Setting the Squelch threshold too high can result in unintended audio drop-outs or no audio
at all.
Note
If the Wire Mode is set for 2 Wire operation, then inject the signal into the line two terminals
of connector J6. Otherwise, inject the signal into the line one terminals of J6. In addition, the
Wire Mode used must be the same configuration as that was used in the Wireline Transmit
Level alignment in Section 13.5.4 on page 13-10.
Line 2
Line 1
APPLICANT: MOTOROLA
EQUIPMENT TYPE: ABZ89FC3797
EXHIBIT D1-4