MOAS II is an antenna switching and station-control system for operators managing multiple radios, amplifiers, and antenna options. It is built around one core idea: safe, repeatable RF routing without adding operational friction.
The platform is designed to support:
deterministic relay switching
interlock-first path validation
clear operating state visibility
remote operation that still respects station safety constraints
Capabilities
MOAS II drives antenna relays and related control lines from a computer over USB (or ethernet/wifi).
It supports up to 64 independently controlled relays. Outputs are arranged in banks of eight, and each bank can be configured as high-side (source) or low-side (sink) switching. That electrical choice is abstracted away from software, so control logic stays consistent.
The system interfaces with transceiver amplifier keying lines and can optionally wire into inhibit lines. This allows coordinated switching that helps prevent hot-switching and enables different routing strategies for transmit and receive paths.
With the server and configuration tooling, MOAS II can manage advanced station layouts, including:
multi-stack antenna systems
electrically steerable arrays (such as 4-square systems)
shared TX/RX antennas
triplexer-based combinations
single-band and shared amplifier workflows
custom inhibit and sequencing rules
This makes it practical to build and operate antenna systems that would be difficult or unrealistic to run safely with manual switching alone.
MOAS Elements
Multi-Platform Server
A server is required to control the hardware switch. The server is what loads the configuration and manages the logic. It is available for most operating systems including Docker.
Download it at https://moas.m1dst.co.uk/server/.
MOAS II
Master Of Antenna Switching (MOAS)
Developed by James Patterson, M1DST and Paul Young, K1XM.
Version: v2.0.0
Loading configuration: C:\Users\m1dst\m1dst_COM10.moas
Read 1950 lines from configuration file
Configuration loaded.
MOAS core running. Press Ctrl+C to stop.
Switch 1 port COM10 is connected
Switch 1 port COM10 is operational
Configuration Tool
It’s possible to build your own configurations manually, but it’s strongly recommended to use the visual editor.
The built‑in validation helps prevent errors and makes the process far more reliable.
Open it at https://moas.m1dst.co.uk/config.
Switching Hardware
Planned documentation for controller boards, relay modules, wiring strategy, and build notes. Supports connectivity via USB, Ethernet and WiFi.
Multi-Platform Client Apps
Planned desktop/mobile client guides, API examples, and operator workflows.