Wireless DMX receiver for on-set lighting control; converts 2.4 GHz RF signals into fixture commands. Range up to 300m, sub-5ms latency.
Definition
A receiver is a wireless device for the remote control of lighting equipment on a film set. It receives radio signals from a transmitter and converts them into control commands for lighting fixtures. The device typically operates in the 2.4 GHz ISM band with a range of up to 300 meters in line of sight. The term is derived from the English "to receive" and became established with the introduction of wireless DMX systems in film lighting.
Technical Details
Modern film receivers support the DMX512 protocol with 512 channels and operate with a latency of under 5 milliseconds. The devices feature XLR-3 or XLR-5 outputs and are powered via a 12V-24V DC supply or integrated lithium batteries with a 6-8 hour runtime. Frequency hopping technology with 79 hopping frequencies ensures interference-free transmission. High-quality receivers such as the Astera ART7 or City Theatrical SHoW DMX offer 128-bit AES encryption and auto-frequency selection. The transmission power is a maximum of 10 mW, in accordance with ISM band regulations.
History & Development
In 1986, USITT developed the DMX512 protocol for stage lighting. Wireless DMX systems entered the market in 1998 with City Theatrical's first SHoW DMX. The 2.4 GHz band became established as the standard in 2003, after earlier 900 MHz systems proved susceptible to interference. In 2010, CRMX chips (Cognitive Radio Mixed Signal) from LumenRadio enabled error-free transmission even with radio interference. Since 2018, modern receivers have also supported RDM (Remote Device Management) for bidirectional communication.
Practical Application in Film
On "Blade Runner 2049," Roger Deakins wirelessly controlled over 200 LED panels for the city scenes. Receivers allow for rapid lighting changes without cable runs, especially during night shoots or in hard-to-reach positions. A typical workflow: the gaffer programs lighting moods on the DMX controller, sends signals to distributed receivers, which control connected HMI, LED, or tungsten fixtures. Advantage: no cable paths, quick adjustments between takes. Disadvantage: battery operation requires change cycles, radio interference in urban areas is possible.
Comparison & Alternatives
Receivers differ from DMX splitters by their wireless functionality and from wireless video receivers by their control function rather than image transmission. Wired DMX distribution offers absolute reliability but less flexibility. Powerline DMX transmits control signals via power cables but only works with compatible generators. WDMX alternatives like Wireless Solution or RC4Magic operate in different frequency bands but are less common than the CRMX standard.