README.md
6x2 Matrix Antenna Switch

A complete antenna switching system that allows connecting two transceivers to up to 6 antennas with intelligent control and protection.

Overview

This project implements a 6x2 matrix antenna switch system consisting of two main modules:


Relay Module: High-power RF switching matrix with electromechanical relays
Interface Module: ESP32-based control system with RS485 communication


The system provides flexible antenna routing while preventing simultaneous connection of both transceivers to the same antenna, ensuring equipment protection and operational safety.

Key Features

RF Performance


Power Handling: Up to 1.5kW (full amateur license power)
Frequency Range: DC to 50+ MHz with good performance
Protection: Gas discharge tubes on all antenna ports for lightning/ESD protection
Isolation: Decent port-to-port isolation


Better than 75dB below 10MHz
Better than 65dB below 30MHz
Better than 50dB below 50MHz




Control System


ESP32-based: WiFi-enabled microcontroller with comprehensive firmware
Multiple Interfaces: Web UI, REST API, WebSocket, and serial command control
Network Features: mDNS discovery (antenna.local), OTA updates, WiFi management
Smart Features: Antenna conflict prevention, single radio mode, persistent settings
RS485 Interface: Reliable half-duplex communication with automatic direction detection
Expandability: SAO (Simple Add-On) connector for future enhancements


Design Features


Modular Architecture: Separate relay and interface modules for flexibility
Three-Relay Configuration: Prevents transceiver conflicts while maintaining isolation
Professional PCB Design: Multi-layer boards with proper grounding and shielding
Easy Assembly: Through-hole components for straightforward construction


System Architecture

The complete system consists of:


Relay Module:


6 antenna sections, each with 3 relays
Allows connection to Radio 1, Radio 2, or 50Ω dummy load
Comprehensive protection circuitry

Interface Module: Provides intelligent control and communication


ESP32 DevKit v1 for processing and connectivity
RS485 interface for remote control
Expansion connector for additional features



Documentation

Hardware Documentation


Relay Module Hardware - Complete RF switching matrix documentation
Interface Module Hardware - ESP32 control system hardware


Firmware Documentation


Interface Module Firmware - ESP32 firmware with web interface, REST API, and OTA updates