Hello, the definition of healing frequency device is more accurate.
You first use a radionic device (with copper or silver spiral dials) to find the frequency of the target through either a black and white photographic negative (silver particles are assumed to memorize the frequency of the organisms appearing in the photograph), a drop of blood or a sample of hair with root when working with healing. In the case of agriculture the best are photographs but always the old type with silver particles on the negative.
Using that on a radionic device you then impose another frequency generally of a substance for effecting the target. This frequency is either taken from a list of already experimented frequencies or found with a sample of the substance you want to remotely apply. You can also directly use the substance on the radionic device using a plate connected to the target's sample.
So you have two ways, work with frequencies, or with samples. Well you can mix also. That is resumed the basic theory of operation. You can find publications with the correct operation of radionic devices and also schematics, but I strongly advice to go to the roots and learn from old original publications, as radionics has suffered much distortion after 1970-80. Nevertheless some modern researchers have kept the original research, but really few have done so.