Questions tagged [ndb]

A type of navigation beacon that does not broadcast directional information, but, instead, must be located by figuring out the direction from which the NDB's signal is strongest.

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What is the point of modulating an adf loop antenna output with a voltage switching source through a balanced modulator?

In the block diagram I found for the ADF system, there is a balanced modulator fed with the output signal from the ADF loop antenna and a 47Hz signal from a switching source. What does the output from this balanced modulator looks like and what is…