Editing SimTX API/Transmitter session (section)

== Live updates ==
[[SimTX API/Packets/TxUpdate|TxUpdate]] changes frequency, power, bandwidth, audio low cut, drive, headroom, compression and audio gain while on air. Every field is <code>optional</code>; send only those that change. The server answers each update with a [[SimTX API/Packets/TxUpdateAck|TxUpdateAck]] that reports, for every field set, whether it was applied and the value now in effect. At most one update is applied per 250 ms, and the frequency at most once per second; updates sent faster are refused in the ack, not queued.

Other settings, such as the modulation, sample rate, source or station, cannot be changed on air. Close the session and open a new one. Antenna pointing and tracking change with [[SimTX API/Packets/AntennaPointingUpdate|AntennaPointingUpdate]].