65
Frequency Sweep (External Coupler) Mode
Hint: By using an external amplifier and an external coupler you can protect the
Bode 100 inputs from reverse power emitted by the DUT (e.g. radio waves
received by a broadcast antenna).
6.1 Example: Frequency Sweep
(External Coupler) Measurement
Expected example duration: 30 minutes.
In this example you will learn step by step how to use the Frequency Sweep
(External Coupler) mode of the Bode 100.
How to:
• Connect an external coupler
• Set configuration parameters like the input resistor and bandwidth
• Calibrate and compensate the connection system
• Display reflection in VSWR format
• Display impedance in polar format
• Remove the effect of noise
Let’s examine the delivered IF filter when connected to the Bode 100 by a 50 Ω
directional coupler.
Questions:
• What is the VSWR of the IF filter within its passband?
• How does the impedance of the IF filter look in the polar format?
• What is the exact impedance and VSWR of the filter at its center frequency
of 10.7 MHz?
To find out the answers, proceed as follows:
1. Connect the Bode 100 to the computer and start the Bode Analyzer Suite.
2. Click the Frequency Sweep (External Coupler) toolbar button to switch
to the Frequency Sweep (External Coupler) mode.
3. Click the Device Configuration toolbar button to configure the
Frequency Sweep (External Coupler) mode.
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