Editing Automatic picture transmission (section)

=== Software-defined radio ===

A popular device used to receive the APT signals is a [[Software-defined radio]] (SDR). Many of these are cheap, and allow reception of frequencies from 500 kHz up to- in some cases- 7 GHz. [[Open-source]] software is available to set up the receiver, and since many have [[Plug and play]] it makes reception of APT accessible to the non-specialist. A cheap and reliable example is the RTL-SDR v3/v4, as it can reach up to 2.56 MHz in bandwidth which more than adequate for the reception of the APT signals (34 kHz). The SDR can decode on all the modulations, in this case it would be the [[Frequency modulation|NFM]].