The PS Engineering PMA7000B Option 3 is a panel-mounted audio selector, marker beacon receiver, and 6-place VOX intercom system designed for general aviation aircraft. It provides centralized control of aircraft communications, navigation audio, and intercom functions in a single integrated unit.

The system supports switching between up to 3 communication radios (COM 1, COM 2, COM 3) and multiple navigation/aux audio sources including NAV, ADF, DME, and marker beacon inputs. It also includes a built-in 75 MHz marker beacon receiver with cockpit annunciation lights for outer, middle, and inner marker signals.

It features IntelliVox® voice-activated intercom technology, which automatically manages squelch without manual adjustment, allowing clear multi-place communication between pilot, copilot, and passengers. The unit also supports split COM operation, fail-safe mode (direct COM 1 connection on power loss), and multiple unswitched audio inputs for alerts such as autopilot disconnect or terrain warnings.

The Option 3 configuration includes the full marker beacon capability and expanded audio routing functions, making it suitable for more complex avionics installations.

Key features include:

PS Engineering part number: PMA7000B Option 3 (7000B-Opt. 3)
Audio selector + intercom + marker beacon receiver
Supports up to 3 COM radios and multiple NAV/aux inputs
Built-in 75 MHz marker beacon receiver
6-place IntelliVox® VOX intercom system
Split COM operation capability
Fail-safe mode (COM 1 direct connection on power loss)
Multiple unswitched inputs for alerts and warnings
Panel-mounted integrated avionics audio management system
Compatible with GA aircraft avionics stacks
Designed for complex communication and navigation audio routing