MLS MLSH041 Manual de instalación descargar pdf (Pagina 27)

ALIGNMENT AND TROUBLESHOOTING PROCEDURES LBI-38425A

Set the Signal Generator output for twice the microvolt reading obtained in the 12 dB

SINAD measurement.

Set the Range control on the Distortion Analyzer in the SET LEVEL position (1000

Hz filter out of the circuit), and adjust the input LEVEL control for a +2 dB reading

on the 30% range.

While increasing the deviation of the Signal Generator, switch the RANGE control

from SET LEVEL to distortion range until a 12 dB difference is obtained between

the SET LEVEL and distortion range readings (from +2 dB to –10 dB).

The deviation control reading for the 12 dB difference is the Modulation Acceptance

Bandwidth of the receiver. It should be more than ±6.5 kHz.

Service Check

If the Modulation Acceptance Bandwidth test does not indicate the proper width, refer to

the Receiver Troubleshooting Procedure.

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MLS MLSH041 Manual de instalación Pagina 27