1. Amateur Radio Direction Finding
IARU Region II

2. The International Amateur Radio Union (IARU)
Represents the interests of Amateur Radio operators worldwide
Is the international organizing body for ARDF
IARU Region II is the regional organization for the American continent, the Caribbean, and some islands of the Pacific

3. What is Amateur Radio Direction Finding (ARDF)
Sport of finding radio transmitters on foot, using radio receiver, map, and compass in diverse, wooded terrain.
ARDF joins orienteering skills like the proper use of topographic maps, compass skills, and locational awareness, with radio direction finding skills using hand-held portable receivers and antennas.

4. How does it work
Competitors carry portable radio receivers with directional antennas with which they try to find the transmitters.

5. How does it work
Competitors must punch a card they carry with them at each transmitter to prove they have found it.

6. How does it work
A typical ARDF course will be four to ten kilometers long.
Competitors start in five minute intervals, so everyone hears transmitter number one when they first turn on their receivers.
Winners are determined by those who find the most transmitters in the fastest overall time.

7. How does it work
Each transmitter sends a simple Morse code identification for one minute before going silent and the next transmitter, in sequence, sends its identification for one minute.
Each transmitter is therefore silent for four minutes at a time
Locating a hidden transmitter is done by taking bearings and signal strength indications from multiple locations.

8. ARDF competitors are divided into classes based on age and gender
There are nine classes:
D19 (women 19 years old and younger,)
D21 (any women,)
D35 (women 35 years old or older,)
D50 (women 50 years old or older,)
M19 (men 19 years old or younger,)
M21 (any men,)
M40 (men 40 years old or older,)
M50 (men 50 years old or older,) and
M60 (men 60 years old or older.)
Anyone can enter D21 or M21 regardless of age.
The only class that must find all five transmitters is M21.
The D19, D21, D35, M19, M40, and M50 classes must find four transmitters
The D50 and M60 classes must find three transmitters.

9. RULES IN AMATEUR RADIO DIRECTION FINDING
PART A – ORGANIZATION
PART B – COMPETITION
RULES FOR CHAMPIONSHIPS

10. Part A Organization http://www.ardf-r1.org/ardf_rules
1. Definitions
2. General provisions
3. Event program
4. Event preparations
5. Participation
6. Costs
7. Event information
8. Entries
9. Jury
10. Complaints
11. Protests
12. Media service
13. Event reports

11. Part B Competition Contents: 14. Categories 2
15. Training / model event 2
16. Starting order 2
17. Team officials’ meeting 3
18. Terrain 3
19. Courses 3
20. Restricted areas and routes 4
21. Maps 4
22. Equipment used by competitors 4
23. Control cards and registering devices 4
24. Start 5
25. Transmitters 5
26. Transmitters arrangement 6
27. Finish and time-keeping 6
28. Results 7
29. Prizes 7
30. Fair play 7
Appendix 1: Technical Specifications for Amateur Radio Direction Finding Equipment 9
Appendix 2: Principles for course planning 10
Appendix 3: Approved control cards and registering devices 12
Appendix 4: IARU ARDF International Class Referees 13
Appendix 5 : Start list preparation 14
Appendix 6: Rules for Youth Regional ARDF Championships 16
Appendix 7: Rules for ARDF Sprint Event
Appendix 8: Rules for ARDF Foxoring Event

14. TOC Using Yagi antennas for RDF Building and using VHF quad antennas
Direction indicators for masts
Search/Rescue agencies
Interferometer techniques
Airborne hunting techniques
Weak signal techniques
Close-in sniffing techniques
Build the Shrunken Quad for sniffing
Build the Sniff-Amp field strength meter for sniffing
International-rules on-foot foxhunting
Creating rules for mobile hunts
Hiding tricks to foil hunters
Build tone/ID boxes for hiding
Adcock RDFs
Fixed site RDFing
RDFing from satellites
Tracking down cable TV leakage
Tracking down power line noise
Commercial/military RDF sets
Computerized triangulation
Dealing with jamming and malicious interference
Using Yagi antennas for RDF
Building and using VHF quad antennas
Reviews of commercial dopplers
Plans for the Roanoke Doppler
Marine RDF equipment
Loops for HF and VHF
External S-meters
Audible S-meters
Review of the Little L-Per RDF
Plans for the Happy Flyers RDF
Review of the BMG SuperDF
Equipment takealong lists
Maps and triangulation
Cooperative hunting
External attenuators, with circuits
Internal attenuators, with circuits
Plans for an automatic attenuator
Vehicle mountings

16. EQUIPMENT

18. AARC First Annual Fox Hunt
April 28, Rain date next day or next week Check morning of event
Start Time 10:00 AM
Transmit
End Time 12:00 PM –meet at club 12:30 PM
Awards – Certificates first, second, third place
Fellowship of HAMs