KCHO.org
A register of transmission engineering

Why a radio signal goes where it goes: the ionosphere, the mast, and the rules that follow from both.

A publication about transmission engineering. Not a broadcast station — no schedules, no listings, no coverage claims.

Section 05

Modulation

Amplitude modulation puts the programme in the envelope and takes every noise that arrives the same way. Frequency modulation puts it in the frequency and can throw amplitude away. Each fails in its own manner, and digital carriage fails in a third.

Close-up of a vintage radio tuner's illuminated glass dial and control knobs
FM plant at the station end. The information sits in the frequency, so a limiter can discard amplitude noise outright.Photo: Jakub Zerdzicki / Pexels

3 entries

Everything filed under Modulation

Every entry is one propagation or hardware fact and the operating consequence of it.

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