Which radio frequencies are permitted?

The frequencies permitted for amateur radio vary by country and are determined by the national regulatory authority, with many frequency ranges being coordinated internationally. In Germany, for example, the bands permitted for licensed radio amateurs range from 135.7 kHz in the longwave range up to 250 GHz in the millimeter wave range. The use of the frequencies is subject to certain conditions such as transmission power limitations and license requirements. For detailed information on the permitted frequencies, you should contact the Federal Network Agency or view the current frequency usage plans on their website. If you want to broadcast without a license, you can use CB radio (27 MHz), PMR446 (446 MHz) or Freenet (149 MHz), for example.