LRL + Electronics

[Tinkerer]

LRL + Electronics

Below we have a readout of an FFT taken form a LRL. We can see a wide range of frequencies.
Would any of the LRL experts be so kind as to explain to me which ones are the important frequencies, meaning the ones that carry the information, so that I can try to implement a device to interface this receiver with a CPU for processing?

Does anybody have some good suggestions of how we could, by the use of electronic circuitry, set up a scientific testing system to prove the functionality of a LRL?

Tinkerer