Agilent Technologies E7401A, E7402A, E7403A, E7404A, E7405A Demodulating and Listening to an AM Signal

88 Chapter 2

Making Complex Measurements

Demodulating and Listening to an AM Signal

Demodulating and Listening to an AM Signal

The functions listed in the menu under Det/Demod allow you to

demodulate and hear signal information displayed on the analyzer.

Simply place a marker on a signal of interest, activate AM

demodulation, turn the speaker on, and then listen.

Demodulating and Listening to an AM Signal

Example 1:

1. Connect an antenna to the analyzer input.

2. Perform a factory preset by pressing Preset, Factory Preset (if

present).

3. Set the Y-Axis Units to dBm by pressing AMPLITUDE, More,

Y-AxisUnits, dBm .

4. Select a frequency range on the analyzer, such as the range for AM

radio broadcasts. For example, the frequency range for AM

broadcasts in the United States is 550 kHz to 1650 kHz. Press

FREQUENCY, Start Freq, 550, kHz, Stop Freq, 1650, kHz.

5. Place a marker on the signal of interest. Press Peak Search to place a

marker on the highest amplitude signal, or press Marker, Normal and

move the marker to a signal of interest. See Figure 2-16.

6. Press Det/Demod, Demod, AM. Use the front-panel volume knob to

control the speaker volume.

Figure 2-16 Demodulation of an AM Signal

Contents

Main Signal Analysis Measurement Guide Agilent Technologies EMC Series Analyzers Notice Safety Information Warrant y LIMITATION OF WARRANTY EXCLUSIVE REMEDIES Where to Find the Latest Informa tion Page Contents Page What is in This Chapter Test Equ ipm ent Comparing Signals Signal Comparison Example 1: Page Signal Comparison Example 2: Page Resolving Signals of Equal Amplitude Resolving Signals Example: Page Page Resolving Small Signals Hidden by Large Signals Resolving Signals Example: Page Page Making Better Frequency Measurements Better Frequency Measurement Example: Page Decreasing the Frequency Span Around the Signal Decreasing the Frequency Span Example: Page Page Tracking Drifting Signals Tracking Signal Drift Example 1: Page Page Tracking Signal Drift Example 2: Page Page Page Measuring Low Level Signals Measuring Low Level Signals Example 1: Page Measuring Low Level Signals Example 2: Measuring Low Level Signals Example 3: Page Measuring Low Level Signals Example 4: Page Page Identifying Distortion Products Distortion from the Analyzer Identifying Analyzer Generated Distortion Example: Page Page Third-Order Intermodulation Distortion Identifying TOI Distortion Example: Page Page Page Measuring Signal-to-Noise Signal-to-Noise Measurement Example: S/N 70 dB/Hz10 30 kHz()log+ 25.23 dB30 kHz()== Making Noise Measurements Noise Measurement Example 1: Page Page Page Page Noise Measurement Example 2: Noise Measurement Example 3: Page Page Demodulating AM Signals (Using the Analyzer As a Fixed Tuned Receiver) Demodulating an AM Signal Example 1: Page Page Page Page Page Demodulating FM Signals Demodulating a FM Signal Example: Page Page Page Page Whats in This Chapter Required Test Equipment Making Stimulus Response Measu rements What Are Stimulus Response Measurements? Using An Analyzer With A Tracking Generator Stepping Through a Transmission Measurement Page Page Page Page Tracking Generator Unleveled Condition Measuring Device Bandwidth Page Page Measuring Stop Band Attenuation Using Log Sweep Page Page Page Page Making a Reflection Calibration Measurement Example: Reflection Calibration Measuring the Return Loss Chapter 2 87 VSWR 110 Making Complex Measurements Making a Reflection Calibration Measurement -----------------------= Table 2-1 Power to VSWR Conversion + 110 Demodulating and Listening to an AM Signal Demodulating and Listening to an AM Signal Example 1: Demodulating and Listening to an AM Signal Example 2: