ARDF - BVARC

ARDFA mateur Radio Direction Finding(Fox Hunting) International Style Thomas KrahnKT5TK / DL4 MDW Fox Hunting Should this be stopped? ARDF International Rules Find 5 hidden transmitters by using a portable receiver with a directional antenna The foxes must be found before a maximum time limit. Ranking: 1.) Number of foxes in time limit. 2.) Time at finish line The transmitters are under time control. Each TX sends for one minute its ID, then the next fox is switched on. (5 minute total cycle) Typically used: 80 m CW Morse code,2 m AM modulated Morse code ARDF Fox IDs MOE . MOI .. MOS .. MOH .. MO5 .. Long dashes good for direction finding Count the dots to know which fox it is ARDF Frequencies 80 m: MHz (NTSC color carrier frequency) 5th fox sometimes on different frequency (homing fox) 2 m: MHz (Europe), MHz (official IARU region II) ARDF Transmitters Control logic usually micro-controller Time synchronization of all 5 foxes difficult TX power 1 5 Watts 2 m: Antenna cross dipole 80 m: Grounding wires, Tent pegs, 50 ft wire Close to the transmitter good visible flag and punch station.

ARDF Competitions 28-30 May 2011 Shropshire ARDF Festival Ludlow, England, UK 5-10 September 2011 18th IARU Region I ARDF Championships Oradea, Romania 16-18 September 2011 6th IARU Region II ARDF Championships Albuquerque, New Mexico 23-28 September 2011 5th IARU Region III ARDF Championships Victoria, Australia September 201216th World ARDF Championships

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  2011, September, Dfars, September 2011

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