Editing Radio terms

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These definitions are sufficient for following the operating guides. The linked pages contain the technical detail.

{| class="wikitable"
! Term !! Meaning in SimTX !! Read more
|-
| TX / RX || Transmit / receive. A transmitter sends a signal; a receiver tunes to it. || [[SimTX Transmitter]]
|-
| Server || The shared simulation to which transmitters and receivers connect. Both must use the same server to share signals. || [[Getting Started]]
|-
| Callsign || The station name shown with a transmission. It is not the account sign-in. || [[Station Configuration]]
|-
| Frequency || Where the signal is placed on the radio dial. 1000 Hz = 1 kHz; 1000 kHz = 1 MHz. 4625000 Hz = 4625 kHz = 4.625 MHz. || [[Modulation Modes]]
|-
| Modulation || How information is carried by a radio signal. The receiver needs a compatible mode, such as AM or USB. || [[Modulation Modes]]
|-
| Bandwidth || How wide a signal or receiver channel is, measured in Hz. It is different from the centre frequency and the sample rate. || [[Modulation Modes]]
|-
| Power (W) || Requested transmitter output in watts. Actual output can fall because of antenna mismatch or heating. || [[Power Amplifier Behaviour]]
|-
| Audio gain || The level of the audio fed into the transmitter. It is not the same control as radio output power. || [[Transmission Sources]]
|-
| Antenna || The simulated structure that radiates or receives the signal. Its size and orientation affect reception. || [[Antenna System]]
|-
| SWR / VSWR || A measure of antenna matching. Closer to 1 means less reflected power; it does not measure distance or audio quality. || [[SWR and Transmitter Protection]]
|-
| FWD / REF || Forward power leaving the transmitter / power reflected by the antenna mismatch. || [[Transmitter Interface]]
|-
| PA / ALC || Power amplifier / automatic level control. These describe output-stage behavior, not separate audio sources. || [[Advanced Transmitter Settings]]
|-
| dB / dBi || Decibels express ratios. dBi expresses antenna gain relative to an ideal reference in a direction. || [[Antenna Calculations]]
|-
| Azimuth || A compass direction: 0° north, 90° east, 180° south, 270° west. || [[Antenna System]]
|-
| Propagation || How the signal travels from transmitter to receiver, including ground and ionospheric paths. || [[Propagation Basics]]
|-
| IQ || Two components of a complex signal. External IQ already describes a radio waveform, rather than ordinary sound for AM or FM to encode. || [[Transmission Sources]]
|-
| Session || One transmission with its own state and controls. Pressing Start TX creates a new session. || [[Sessions and Queueing]]
|-
| Lua extension || An installed package that adds features. Using one does not require programming. || [[Lua extensions]]
|-
| API / manifest || An API defines functions available to extension code. A manifest describes a package and its requirements. || [[Creating Lua extensions]]
|}

[[Category:SimTX]]