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80m ARDF
TX and RX by
Les Tocko
VA7OM
Keith Witney VE7KW
NSARC 20140515 15/15/2014
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ARDF Foxhunting
Amateur Radio Direction Finding
AKA
- “Fox”, “Bunny”, Transmitter hunting
- Radio Sports
- Radio Orienteering
2m and 80m
NSARC 20100708 25/15/2014
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ADRF Foxhunting
What is it?
Up to 5 transmitters per
band are hidden in a
Park + microfoxes
90 minutes to find the
transmitters
Scored on number of
transmitters found and
the time taken.
NSARC 20100708 35/15/2014
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ARDF Foxhunting
How does it work?
The transmitters are on for one minute each in sequence
MOE, MOI, MOS, MOH, MO5 all on the same frequency
(Regular Fox 3550, 3580 microfoxes)
Identified by slow speed Morse (can count E, I, S, H, 5)
There is a continuous beacon (MO) at the finish for
International competition on a separate frequency.
Antennas are short verticals with counterpoise
You find the transmitters by taking directional bearings,
observing signal strengths and ultimately searching for
the “flag”
The flag has a punch used to mark your score card.
NSARC 20100708 45/15/2014
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80m Foxhunting
Receive equipment is less bulky
Effective sense antenna
Sharp null
Different but fewer propagation effects
Easier????
NSARC 20100708 55/15/2014
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80m ARDF
Foxhunting Receiver
CW
Home built (loop and sense antenna) Les VA7OM
This is a superhet design from a kit and cost about
$200.
The Next slides show the new $50 kit prototype.
NSARC 20100708 65/15/2014
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NSARC HF Operators 75/15/2014
80m ARDF
Foxhunting Receiver
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NSARC HF Operators 85/15/2014
80m ARDF
Foxhunting Receiver
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NSARC HF Operators 95/15/2014
80m ARDF
Foxhunting Receiver
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NSARC HF Operators 105/15/2014
80m ARDF
Foxhunting Receiver
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NSARC HF Operators 115/15/2014
80m ARDF
Foxhunting Receiver
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NSARC HF Operators 125/15/2014
80m ARDF
Micro Fox
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NSARC HF Operators 135/15/2014
80m ARDF
Micro Fox
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NSARC HF Operators 145/15/2014
80m ARDF
5W Foxes
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NSARC HF Operators 155/15/2014
80m ARDF
5W Foxes
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80m ARDF
Transmitter
CW keyed 80m 1-5w
Homebuilt using a G3ZOI
design.
NSARC 20100708 165/15/2014
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ARDF Foxhunt
What Next?
Try it! Open to all. Loaner equipment available or
just observe.
Collect your own gear
2m handheld (Rx only)
2m Directional antenna (VE7CGE)
2m Attenuator; kit or build
80m Rx Kit
VE7KW, VA7KBA, VA7OM for assistance
NSARC 20100708 175/15/2014
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ARDF Foxhunting
For more information
References
IARU http://www.ardf-r1.org/
BC Radio Sport http://bcradiosport.ca
2m
Antennas
http://www.northbrevardarc.org/PDF/TAPEMeasureantenna
Attenuators
http://home.att.net/~jleggio/projects/rdf/p_atten.htm
80m
Receivers
http://www.geocities.jp/chn_ardf/index.htm
NSARC 20100708 185/15/2014
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ARDF Foxhunting
For more information
Homing In Site
http://members.aol.com/homingin/
RAC http://www.rac.ca/en/amateur-radio/operating-
technical/ardf/
ARRL http://www.arrl.org/news/ardf-update-foxes-fitness-
and-fun-in-2010
Ultimate Automated Doppler DF System
http://www.ahha-doppler.com/gpss/gpss.html
NSARC 20100708 195/15/2014
