NRHARC Fox Hunting
Also Known as RDF (Radio Direction
Fox Hunt TBD Stay tuned for details!
NRHARC Hidden Transmitter Hunt
Winners April Hunt
Rules for the NRHARC Hidden Transmitter (hunters
should know these rules, too!)
transmitter site must be on public land (parks, schools, etc.), visible
and accessible by a vehicle using public roadways.
You cannot hide on a boat out on a lake and cannot hide on the roof of a
You must hide within
the limits of NE Tarrant Co.
It is best to obtain the Mapsco NE Tarrant Co map.
Hunters start from
the NRH Fire
Administration Building, 7202 Dick Fisher Drive, NRH.
You must make a
reasonable effort that receiving stations will hear you from the
Select a site well
in advance and make a plan.
Consider that you may need to pull an antenna into a tree to get a high
Be set up and ready to transmit ahead of the start time.
Start on time; the hunters will be waiting.
At the start, ask the number of hunters that will come in handy
Buy refreshments and
serve once the hunters arrive.
Keep the receipt up to $15 to turn into the
Your antenna must be
omnidirectional, but any power level is OK (see also #3 above).
continuously on 146.460 MHz until found.
This reduces the risk of reckless driving.
Read a QST article or anything you like; periodically announce
that you are the hidden transmitter.
ID every 10 minutes as required.
Once most hunters have arrived, reveal your location to
Rules for Hunters
Obey traffic laws and drive safely.
Stay on public roadways.
Since you can get a directional bearing anytime, take the time to
pull off the roadway and out of traffic when taking a bearing.
technology is not permitted that would take the fun out of it.
If you are first to
arrive at the hidden transmitter location, you set the date and hide
Hints for Hunters
Use a directional
Use a receiver with an S-meter, analog S-meters are easier to
Take a map of
Tarrant County note that parks are usually identified in green color.
Take a partner to
hold the antenna while you focus on driving safely.
If you can, take two partners, one for the antenna and one to
study the map and take bearings.
A hand-made 3
element beam or Cubical Quad is cheap, easy to make and they work great.
Watch for low hanging branches.
As you get closer,
the signal will be full scale in any direction.
Use an attenuator to reduce the signal and center the S-meter.
If no attenuator, DF when really close by removing the antenna
from your HT and rotate the HT on a flat surface (practice this on a
known signal ahead of time).
If you use an attenuator, dont TX into it.
Technique #1 drive
toward the transmitter taking regular bearings until you arrive
Technique #2 drive
some distance at right angle to your first bearing and take a second
Triangulate and estimate the location of the hidden transmitter
and drive there.
Try to take your
bearings on high ground, but away from metal reflectors (like water
These locations are more likely to give you an accurate bearing.
Fox Hunting (RDF) sites:
440 Tape Measure Beam (click
for PDF file)
2 M Beam:
Tape Measure 2M Beam:
Cubical Quad plan:
Easy driven element:
This shows an easy way to feed the driven element
without using a gamma match:
Build your own: