Radio Direction Finding

A turnstile antenna for 2-meter ARDF - Antenna design for use with hidden transmitters on international-rules ARDF events

Handi-Tenna portable satellite antenna - Here is a high-performance hand-held beam antenna that is easy to build and guaranteed to improve your downlink from the LEO satellites over ANY rubber duck or mobile whip

Build your DF Unit - Building your doppler, pictures and instructions.

RDF2 two element, close spaced Yagi antenna - This antenna is an adaptation of the RDF2 two element, close spaced Yagi antenna described in the May, 1996 issue of 73 Amateur Radio Today Magazine.

Hidden Transmitter Hunting - Lots of information of hidding transmitters, building portable yagi antennas, s-meters, and much more

RDF projects - Antennas, attenuators, fox timers, controlers and transmitters

The Adcock HF RDF Antenna - The Adcock antenna has been used for a long time for RDF. It is basically an interferometer.

Homing In - All about radio direction finding (RDF)

N6QAB Radio Direction Finding - N6QAB Radio Direction Finding Web Site, DF vehicles, transmitters, sniffers, dopplers, TH-D7A

ARDF Projects by WB2HOL - Antennas, attenuators, Fox Timers and Controllers and Fox Transmitters

7db tape measure yagi beam for RDF - A 3 element yagi beam antenna made with a tape measure. This design exhibits a very clean pattern and is perfect for RDF use.

Transmitter hunting - Locating or finding radio transmission sources or hidden radio transmitters is known as transmitter hunting.

WB2HOL RDF Projects - A collection of useful and interesting projects for the RDF enthusiast by Joe WB2HOL

Antelope Valley T-Hunting - AVARC - Antelope Valley Amateur Radio Club T-Hunt Page.

RDF2 two element, close spaced Yagi antenna - This antenna is an adaptation of the RDF2 two element, close spaced Yagi antenna described in the May, 1996 issue of 73 Amateur Radio Today Magazine.

2006 US ARDF Championships - April 8-9, 2006 USA ARDF Championships

2M Programmable Fox-Or Transmitter - The 2 metre fox-or transmitter is a small low power transmitter which mounts in a small plasic pipe and runs off two AA batteries. The board measures just 12mm by 70mm.

7db tape measure yagi beam for RDF - A 3 element yagi beam antenna made with a tape measure. This design exhibits a very clean pattern and is perfect for RDF use.

80m fox hunting receiver - Schematic anc PCB for a fox hunting receiver for 80 meters band

80M Fox-Or-Test Transmitter - The 80 metre fox-or/test transmitter is a small low power transmitter which is designed to be used as an alignment aid for running up 80 metre foxhunt or ARDF receivers. It is also usable as a micro transmitter for fox-or-ing events.

80m sniffer - A full superhetrodyne SSB fox hunting receiver kit

A low power 3.5MHz ARDF transmitter - This low power transmitter is developed for ARDF exercising purposes but of course can be used as super QRP transmitter either. With 1 or 2 meter wire as antenna and a ARDF receiver with ferrite-rod antenna the range is about 100m but with better antennas and a 'real' receiver the range is probably much larger.

A new method of radio direction finding Priority listing - A method of finding radio sources with antennas based on omni-directionality (the less directional the better coverage). Uses energy levels and some sophisticated math (encompassed in a free software download on the site) to find x,y,z coordinates of the fox relative to the center of your antenna array. Can be overlayed on a GPS map to help you locate in real-time.

A turnstile antenna for 2-meter ARDF - Antenna design for use with hidden transmitters on international-rules ARDF events

AA9CC Web Page - A few foxhunt reports, a phased array antenna plotting program and some cool links.

APRS and Fox Huntinhg - Using APRS For Direction Finding

ARDF in holland - Ardf holland, information about ardf activities in the netherlands, in english and dutch

ARDF Projects - ABARC fox hunting projects, attenuator, antenna, S meter and squeeker.

ARDF Projects by WB2HOL - Antennas, attenuators, Fox Timers and Controllers and Fox Transmitters

ARDF transmitter for 80 meters - The 80m TX described here is the well known ON7YD ATX-80 and timer, combined and re-engineered to fit a readily available enclosure by G3ZOI

ARDF80 Receiver - Documentation to build your onw 80m ARDF receiver

ARDF@DL online - ARDF-Funksport in Deutschland - ARDF-Funksportreferats im DARC

Build a direction finder - Build a VHF radio direction finder by WB2HOL

Build your DF Unit - Building your doppler, pictures and instructions.

DF Antenna for 2 meters - Direction Finding (DF or Fox) hunts antenna for 144 Mhz

Far circuits - Direction finding projects, useful tools for t-hunting operations

Ham Radio in Austin and Central Texas - Transmitter hunting club

Handi-Tenna portable satellite antenna - Here is a high-performance hand-held beam antenna that is easy to build and guaranteed to improve your downlink from the LEO satellites over ANY rubber duck or mobile whip

Hidden Transmitter Hunting - Lots of information of hidding transmitters, building portable yagi antennas, s-meters, and much more

Hidden transmitter hunting - Interesting t-hunting projects, from antennas to audible smeters

Homing In - All about radio direction finding (RDF)

HRX80 80 meters receivers for APRS - 80-meter peilontvanger / receiver includes printed circuit sample and list of components

KD6IFZ Radio Direction Finding Page - "Cool links and the ""T-helper Pro"""

KQ6XA Bonnie Crystal - Lots of projects and introductions to RDF and T Hunting

Kq6xa ROCA radio orienteering in a compact area - ROCA Radio Orienteering in a Compact Area, ARDF Foxhunting. T-Hunting. The New Walking Foxhunt "ROCA". Rules and Event Organizational Information. Experimental and Competition Events. Equipment. Links. RDF Radio Direction Finding Systems. Mobile Transmitter Hunting.

Let's Go T-Hunting - An introduction to RDF contesting in southern California, updated from a paper originally submitted for Proceedings of the 1992 West Coast VHF/UHF Conference.

LU6DPP Doppler - Doppler informations, building notes in Spanish

N6QAB Radio Direction Finding - N6QAB Radio Direction Finding Web Site, DF vehicles, transmitters, sniffers, dopplers, TH-D7A

N6QAB Radio Direction Finding Web Site - Samples and documentation on RDF setups

Offset attenuator project - Build An Offset Attenuator by Joe Moell KØOV as featured in Homing In for May 1998

ON7YD ARDF pages - Includes some interesting projects for low power ARDF transmitters

PA3DFC direction finding - ARDF Homepage, Nederlandse ARDF-Homepage

PB 2 Radio Direction Finding - info on radio direction finding

Polish radio direction finding - IARU region 1 RD championship

Radio Direction Finding - The Utah Amateur Radio Club - Radio Direction-Finding RDF

Radio Direction Finding - introduction - History of Radio Direction Finding, performance and limitation of RDF Systems, RDF for non professional use

Radio Direction Finding SM5SVM - SM5SVM ARDF resources

Radio Frequency Beacon Finder - This project is a radio frequency receiver that will help the user the trace the direction and distance of transmitter beacon(s) operating at 433MHz frequency by Cornell Univerity

Radiopejlorientering - Radio Direction Finding - The Swedish ARDF page is mainly presented in the Swedish language, but some articles are in English.

RDF projects - Antennas, attenuators, fox timers, controlers and transmitters

Ron Graham Electronics - Specialising in DF equipment

The Adcock HF RDF Antenna - The Adcock antenna has been used for a long time for RDF. It is basically an interferometer.

The HANDI-Finder - This Radio Direction Finder Device Connects to an FM Receiver, Transceiver, or HT