10 Scope Mode
130 SRM-3006 Narda
10.3.5 Example 4: Remote automobile key (ISM band)
Only the frequency range 433.05 MHz - 434.79 MHz can be specified for
remote automobile keys using the ISM band. The following describes how
the other parameters can be determined:
1. Switch to Spectrum Analysis mode and activate the marker function:
– Find Fcent: Set the marker to the maximum (here: 434.422 MHz).
– Find RBW: Set markers A and B: Bandwidth is the difference between
the two frequency points (here: 1.615 MHz = 2 MHz).
2. Switch to Scope mode.
3. Settings in the example:
– Fcent = 434.422 MHz, RBW = 2 MHz (from the spectrum)
– Sweep Time = 8 ms
– Time Resolution = 1/RBW = 1/2 MHz = 500 ns
Find Fcent Find RBW
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