Absorption wavemeter
The device can be used by the users of radio equipment to check the approximate frequency of a strong signal source, and also to check the output of a transmitter for harmonics. Many radio amateurs use one to check the purity and frequency of their transmitters [1][2][3]. Also devices can be made which work in the same way that are able to detect mobile phones [4]. As an alternative a dip meter can be used.
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Linear Mode
