Hidden Transmitter Hunting has been one of the aspects of amateur radio which always interested me. I have built many projects over the years and have placed construction details for a few of them here. I will add to this collection as I find the time to build the web pages (and the projects). I hope you enjoy these as much as I have.

If you construct any of these projects or improve on any of my ideas, feedback is desired. I would love to hear from other RDF fans. If you find anything which is either incorrect or misrepresented, send me a note and I'll make the corrections as appropriate.

73, Joe WB2HOL

Compass by Wilderness Elite

Send E-mail to me :wb2hol@theleggios.net

Antennas

• Tape Measure 3 Element Yagi - RDF Optimized Beam - Updated 05/17/98 with actual plot of antenna pattern.
• RDF² - 2 Element Sniffer Beam with Tape Measure Elements - Added 12/12/97

• Passive Attenuator - easy for beginners - Updated 12/19/97.
• Active Attenuator - Slightly more complex than the passive attenuator. Updated 04/18/98.

Time-Difference-Of-Arrival RDF UNITS

• 555 Time-Difference-Of-Arrival RDF UNIT - Minimum T.D.O.A. Circuit. NEW 05/01/98
• SIMPLE Time-Difference-Of-Arrival RDF UNIT - A center scale meter shows which way to transmitter.

Fox Timers and Controllers

• The FOX TIMER - travel alarm used to control 250 milliwatt transmitter.
• FOXBOX Transmitter Controller

Fox Transmitters

• THE FOX - two transistor 40 milliwatt fox transmitter NEW 04/22/98
• THE FOX-750 - three transistor 750 milliwatt fox transmitter NEW 04/25/98

Other RDF Projects

• Amplified Field Strength Meter (construction details in TRANSMITTER HUNTING book)
• A Compass Rose suitable for the base of your antenna mount. Download it and then reduce scale as needed before printing. (it is big!)
• Homebrew air-core resolver for electronic compass.

Back to HOME page