Tech

A Robust 3-Antenna Phasing System Using Independent 150↔50 Ω Quadrifilar Transformers (Hard 3:1 Power Splitter with Relay Control)

1. Introduction

This article presents a robust and fault-tolerant phasing system for three identical antennas operating in the 14–30 MHz HF range. The system employs three independent quadrifilar UN‑UN transformers (150 ↔ 50 Ω) whose 150‑ohm sides are connected in parallel to the transmitter port. Each 50‑ohm side feeds one antenna through an equal‑length coaxial line, ensuring correct phase and amplitude balance.

A Robust 4-Antenna Phasing System Using Independent 200↔50 Ω Transformers (Hard 4:1 Power Splitter)

1. Introduction

This document describes a robust 4‑antenna phasing system designed for the 14–30 MHz HF range. The system uses four independent Guanella UN‑UN transformers (200 ↔ 50 Ω) whose 200‑ohm sides are connected in parallel at the transmitter port. Each 50‑ohm side feeds one antenna through an equal‑length coaxial line, maintaining phase and amplitude balance.