Reception & quality

What CTCSS and DCS are in analog radios, why you need a sub-tone, typical frequencies, how to set the tone on a Baofeng and on LPD/PMR, and why it is not over-the-air encryption.

Full channel table for LPD (433.075–434.775 MHz, 69 channels) and PMR446 (446 MHz, 8 channels) with channel spacing, a breakdown of CTCSS/DCS subtones and the legal status of licence-free radios under spectrum-regulator rulings.