These correspond to the short-wave bands from 7 to 14 MHz, occupied by both commercial and radio amateurs. This experimental regenerative receiver has coils with wire 18 to 22 that are wound in a 1 cm tube with wire. The supply is 9 V and the handset is of high impedance. The antenna must be long external for greater sensitivity. Power is provided by a 9 V battery. Consumption is low. The winding direction of the coils is very important to obtain satisfactory results. The NPN transistors can be the BC547. The circuit is from 1998 documentation.
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