Performing Fine Amplitude Adjustment

When and where to use:

This procedure fine tunes the MLC 8000 Subsite Link Converter output so the modulation levels (deviation) of all transmitters on a channel are equal for audio.

Procedure:

  1. Set up test equipment. See “Setting Up Test Equipment” in the MLC 8000 Setup Guide.
  2. Set the optimization receiver to monitor the tested channel. Verify that no active carriers are on the channel.
  3. In the MLC 8000 Configuration Tool with Analog Display and Control application, right-click an MLC 8000 Subsite Link Converter (AGU), click the Audio Monitoring button, then select the IP Simulcast: Subsite Link Converter tab.
    The IP Simulcast: Subsite Link Converter tab appears.
  4. Click 7 Hz to generate the reference PTT test tone. Click Start.
    BR Audio Monitoring and Calibration — IP Simulcast: Subsite Link Converter Tab
  5. Use the DSA to measure the signal at the optimization receiver output (this signal is the audio output to the test equipment).
  6. Record the DSA-measured reference value of the reference site: __________________________, as it is used later.
  7. Adjust the MLC 8000 Subsite Link Converter output for 7 Hz at each non-reference site until the non-reference value is within +/- 0.05 dB of the reference value.
    Repeat 3 through 6 for each non-reference site on the same channel, and each time adjust the output until they equal or match as close as possible to the reference value.
    NoteThe first time you perform 3 through 6 is with the reference site and reference value. Subsequent repetition is for each non-reference site on the same channel.
  8. Repeat 5 through 7 for each site on the channel.
  9. Repeat 2 through 8 for each channel in the system.