Transcription of ARDF - BVARC
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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 transmit
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.
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