Foothill Amateur Radio Society (Radio Direction Finding)

Radio direction finding (RDF) is familiar to many radio amateurs as a fun activity (fox hunting). However, it has a surprisingly large number of applications to diverse areas such as: cellular communication, SIGINT/ELINT, navigation, search and rescue, vehicle and asset tracking, wildlife tracking, spectrum monitoring, etc. It has a long history going back to the very first days of wireless communications.
Today RDF is still a topic of very active research and development. This talk presents the basic principles of RDF in the context of their historical evolution. We cover the basic techniques: using a directional antenna, amplitude comparison of two antennas, Adcock, Watson-Watt, Doppler/Pseudo-Doppler, and Interferometry. If time permits, more advanced techniques using antenna arrays are briefly discussed.

#### Meeting Schedule

• 7:00PM - General socializing. Meet and Greet.
• 7:30PM - Introductions, Announcements.
• 7:45PM - The evening's program.
• 8:45PM - FARS business. Announcements. Raffle.

After the program, and FARS business, we hold a raffle for a few prizes.
FARS Mini Flea Market:
We now offer a mini flea market at our monthly meetings where members may offer items for sale. Here is how to participate:

• The market table is set up shortly after the meeting room doors are opened.
• Sellers should place their items neatly on the market table.
• Sellers may include a small sign of prices, or place price labels on your items. Include your name and call sign.
• Sellers should watch their items and wait for buyers.
• Buyers can make offers for items and negotiate with the seller.
• When a deal is made, transact your business, collect your item/money directly with the other party.