Skip to content

Chameleon Knowledge Base · The Complete Online HF Antenna Handbook

CHA OCF40 System Overview

The CHA OCF40 is a half-pound, roughly 66-foot off-center-fed dipole built for POTA, SOTA, and other lightweight portable HF work. It gives current operators a real resonant wire antenna without turning a compact radio kit into a heavy station.

Product Installation Guides CHA OCF40 Reviewed 2026-07-14
Start with the real operating role: The CHA OCF40 is a half-pound, roughly 66-foot off-center-fed dipole built for POTA, SOTA, and other lightweight portable HF work. It gives current operators a real resonant wire antenna without turning a compact radio kit into a heavy station.

How the documented system works

Its 44-foot and 22-foot wire legs meet at a lightweight matching transformer. It covers 40, 20, 10, and 6 meters without a tuner and 60, 30, 17, 15, and 12 meters with a suitable tuner.

The boundary that prevents mistakes

The unequal leg lengths are intentional. The transformer is the electrical feed point and center support; swapping wire geometry, loading the coax mechanically, or calling every band tuner-free changes the documented system.

Use this field sequence

Add a safe center support and suspension line, connect both named wire legs and a suitable BNC feed line, deploy horizontally or as an inverted-V, then verify the installed antenna before operating within 50 W SSB or 25 W CW/other-mode limits.

Source boundary

CHA OCF40 User Guide 250513. The exact guide, product state, complete feed path, geometry, and safety limits control. Connector fit does not prove electrical or structural compatibility.

Continue learning

Back to the Knowledge Base