Linear ACT-31B One-Channel Block Coded Key Ring Transmitter

The Linear ACT-31B is a single-channel, factory block-coded MegaCode key ring transmitter designed for wireless gate, garage door, and access control operation. Operating at 318 MHz with over 1 million factory-programmed identification codes, the transmitter communicates with compatible Linear receivers and access controllers. Featuring one activation button, a quick-disconnect key ring, and two replaceable CR2016 lithium batteries, the ACT-31B provides portable access control with an estimated battery service life of five years.

Linear ACT-31B 318 MHz MegaCode Single-Button Key Ring Transmitter

The Linear ACT-31B MegaCode Key Ring Transmitter provides single-channel wireless activation for commercial gate operators, garage door systems, and controlled-access entrances. Designed for use with compatible Linear access control receivers and controllers, the transmitter sends a factory-assigned identification code when its single button is pressed, allowing the receiving system to authorize the corresponding access function. Its 318 MHz MegaCode radio format supports over 1 million unique transmitter identification codes, reducing the likelihood of duplicate credentials within an access control installation. The ACT-31B uses factory block coding with sequential identification numbers, making it suitable for residential communities, gated properties, parking facilities, and commercial access control systems that require individually identifiable wireless transmitters.

The ACT-31B operates at 318 MHz and is powered by two replaceable 3V CR2016 lithium coin-cell batteries, which provide an estimated service life of five years under normal operating conditions. Its compact housing measures approximately 1.25 inches wide, 2.25 inches high, and 0.48 inches deep, allowing convenient attachment to a key ring or storage in a pocket. The transmitter incorporates a 10-second transmission timeout that prevents continuous radio transmission if the activation button remains depressed. Each unit is programmed at the factory with a unique MegaCode identification number and supports one of 15 facility codes for compatible access control configurations. The supplied quick-disconnect key ring and replaceable batteries support portable operation and routine maintenance.

The Linear ACT-31B integrates with compatible Linear MegaCode receivers and access control equipment, including the AM/II access controller, AE-1 and AE-2 telephone entry systems, AM-WOR radio reader, and AKR-1 AccessKey receiver. Its factory block-coded format allows compatible Linear controllers to enroll groups of transmitters by entering the starting and ending identification numbers associated with a transmitter block. Depending on the controller, programming can be completed through the system keypad or supported access management software. Individual transmitters can also be enrolled through a receiver's learning procedure by pressing the activation button while the receiver is in programming mode. The ACT-31B is a single-function transmitter; applications requiring four independently controlled functions can use the compatible Linear ACT-34B model.

The Linear ACT-31B Single-Button Transmitter supports wireless access control applications where users require convenient operation of a designated gate, garage door, or controlled entry point. Its factory-programmed MegaCode identification, block enrollment capability, compact keychain design, and five-year battery service life support both new access control installations and expansion of existing Linear systems. The transmitter complies with FCC Part 15 and applicable Industry Canada radio requirements, with wireless range dependent on the receiving equipment, antenna placement, and environmental conditions. Linear documentation specifies a 12-month limited manufacturer warranty, subject to applicable terms and distribution policies. Before deployment, installers should verify receiver frequency compatibility, supported MegaCode formatting, facility code requirements, and transmitter enrollment procedures.