Radionics analysis (include also the pendulum if you wish) works with our consciousness, transcending the operators individual mind, connecting to a vast huge invisible field of information.
But here comes the clue to success in radionics analysis: the question you formulate in your mind when searching for an answer requires one essential element. If the question leads to an answer which makes no sense in the entire context, then you will receive no answer (or just random stuff without value). But if your question is intended to solve a problem, to help to find a solution, to get insight into a matter, then yes, the answer will be loud and clear.
In this regard radionics is very similar to homeopathy, where a small remedy leads to a profound healing process, because the homeopath understood the root problem and choosed the one remedy with the most particular symptom and aspect of the patient. Then it make sense. The patient achieves insight into his illness and understand on a deeper level why he was investing his life force in an illusion and the therapeut achieves more wisdom and insight into the remedy. Use radionics with the intention to learn more, in order to help others. If you use it only for making money, well then my friend, do not wonder why it stops to work.