Key facts
- Manuals
- 1
- Languages
- EN
- Last added
- 2026-09-30
Featured Joe WB2HOL manuals
Joe WB2HOL Radio Direction Finder Projects Guide
This document provides detailed construction guides for several Radio Direction Finder (RDF) projects, including simple and 555‑based Time‑Difference‑Of‑Arrival (TDOA) units, tape‑measure beam antennas, and multiple FOX transmitter designs. Each project includes circuit diagrams, parts lists, PCB layout tips, and practical building advice.
Additional sections cover the HANDI‑Finder kits, frequently asked questions about RDF hunting, hardware resources for home builders, and auxiliary tools such as an RF sniffer with tone output and an audible S‑meter.
Covers: Simple Time‑Difference‑Of‑Arrival RDF · 555 Time‑Difference‑Of‑Arrival RDF · Tape Measure Beam Antenna · FOX Transmitter Designs · HANDI‑Finder · Frequently Asked Questions
Latest Joe WB2HOL manuals
Joe WB2HOL Radio Direction Finder Projects Guide
Application Note 78 pages · 1.5 MB · ENA collection of amateur‑radio projects and step‑by‑step instructions for building various Radio Direction Finder (RDF) systems.
Which document do I need?
Application Note
How to use the product for one specific task, with worked examples.
Questions answered in Joe WB2HOL manuals
How does the TDOA RDF set indicate direction?
It switches the receiver between two antennas at about 500 Hz; the resulting tone’s phase is processed by a synchronous detector to drive a center‑scale meter that points toward the transmitter.