AUDIO OUT port and FM Demodulation

Last updated: 2010-03-31

Description

The AUDIO OUT connector on the test set's front panel can be configured to carry one of two signals:

By default, the AUDIO OUT connector is configured to carry the output from the built in audio generator. This signal is typically used to stimulate a system to measure its audio performance.

It may be useful to configure the AUDIO OUT connector to carry the analog FM Demod signal. This provides the demodulated FM signal for external analysis and baseband processing. Fixed bandwidth bandpass, expandor, and de-emphasis filters can be selected to control the FM Demod signal.

Configure the AUDIO OUT Port

A. Select a signal to output to the AUDIO OUT port.

  1. Press the SYSTEM CONFIG key.

  2. Press the More key on the left side of the display for additional system parameters.

  3. Press the Audio Out Port ( F1 ) key.

  4. Turn the knob to highlight a selection and then press the knob.

Selection of FM Demod signal routed to the front-panel AUDIO OUT port is useful only in AMPS system. There will be no guaranteed performance for the signal present at the Audio Out Port when FM Demod is selected for output.

B. Set FM Demod signal.

When FM Demod signal is selected for output to the front-panel AUDIO OUT port, a bandpass filter, expander circuit, and de-emphasis circuit can be individually inserted or bypassed in the FM Demod signal path.

  1. Press the SYSTEM CONFIG key.

  2. Press the More key.

  3. Press the FM Demod Setup ( F2 ) key.

  4. Turn the knob to highlight a selection and then press the knob.

  5. Enter a value or selection and press the knob.

  6. Press the Close Menu ( F6 ) key.

Related Topics

GPIB Commands: SYSTem:AUDio, AFGenerator