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If one of the bars of both bars is not filled at all, the RF output stage or/and the detector
circuits are not working properly in the analyzer:
On the above picture, the first bar indicates no RF signal at one of the legs of the
resistive bridge. Most likely, this means that a high power (such as, from a transmitter)
was injected into the antenna connector and the analyzer was damaged.
– detector output voltage vs. frequency graph. With no load at the antenna
connector, the display should look like shown on the pictures: