Hello
I would like to introduce theoretically: a crystal radio - which does not require power
Gene's Machine
[...] Mollinet never lost that fascination, which heightened as he was flying P51s for the Air Force during the Korean War. He pulled apart a plane radio one day, and received a strange shock from one of the crystals used to latch onto radio frequencies. The crystal, e surmised in all innocence, was either storing energy or building its own. Coupled with a magnetic field, similar crystal substances will be used by Mollinet to keep the plane itself in the air, and without using any fuel. [...]
link: http://www.rexresearch.com/mollinet/mollinet.htm
crystal radio schema
Antenna (A). Empirical findings state that in order the pulsating signal from the antenna exceeds the required threshold value, the antenna must be at least 80 feet in length (i.e. not less than 24 meters). The earth wire (E).
Coil (L). In original specifications this coil was defined as wound in a single layer on the surface or a non-conductive pipe. The pipe was around 5 cm in diameter (2 inches), and around 20 cm in length. It had 80 coils of conductor wound for the radio for middle range of AM wavelengths, or 150 coils for the radio that receives long AM wavelengths. (It could also be a single coil composed of two segments and a switch, so that than the radio could work on both ranges of AM wavelengths.)
Tuneable capacitor (C) of the maximal capacitance around 365 pF.
Cluster of galena crystals (G) with "cat's whisker" for selecting the working connection point.
Headphones (H) of an old type containing coils wound onto permanent magnets. These headphones must have impedance of at least 2000 Ohms. (Notice that present earphones typically have the impedance around one-third, or less, of this value.)
“All we have to decide is what to do with the time that is given us.“