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Radio Direction Finding Transmitter Hunting
Pack-A-Lunch Hunt
Starting from the Altamont start point.
Sept. 30, 2006

Thanks for visiting the San Francisco Bay Area T-Hunting WEB SITE.

Web page and photography by: Jim - KD6DX

Web servers and space provided by: Johnathan - AE6HO

Last updated: Friday, October 06, 2006

PARTICIPANTS
FOX
Rich - KN6FW
Rich - KN6FW

HUNTERS
Bob - KF6VSE
Jim - KD6DX

Bob-KF6VSE
Jim-KD6DX, Kathleen-N6DOB

 

Participants

Fox: Rich - KN6FW

TEAMS (2)

MILEAGE

NOTES

Bob-KF6VSE The only one who started from the official start point.
Jim-KD6DX and Kathleen-N6DOB Started from Groveland, CA.

 

00map.jpg
00map.jpg
01map.jpg
01map.jpg
Hunt date: Sept. 30, 2006
Start: 10:00 AM from the Altamont start point.
One hidden transmitter, 146.565MHz.
2-watts into a J-Pole antenna.
Scoring method: Mileage.
The hider was, Rich - KN6FW
The winner was, Bob - KF6VSE.

Jim Sakane - KD6DX

02loop.gif
Arrow Antenna
03loop.gif
Instructions
Rich's signal to Groveland was S_7-9, about 13 miles away, so I used a 'Loop' antenna to acquire my bearings.

I must say, it works really well and was so much easier to use. I would just jump out of my car and take a bearing, looking for the deepest null I could find while walking around the car. I would then sight down the edge of the loop, take a compass bearing and subtract or add 90* to what I read.

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Fox Transmitter
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Fox Transmitter
The statistics of taking Loop Antenna bearings were:
Bearing #
1 ... +9* off from actual.
2 ... +15* off from actual.
3 ... +4* off from actual.
4 ... 0* dead on the fox.
5 ... -5* off from actual.
6 ... +8* off from actual.

I used the VHF Sniffer MK4 as my receiver, locked in on attenuation '0' to hear a very sharp and deep null.

060930_123049-009.jpg
Cross-band
repeater
060930_123411-013.jpg
Rich-KN6FW with Cross-band repeater

The Doppler, of course kept me informed if the Fox was in front of me or I passed it and it was now behind me.

The VHF Sniffer MK4, was also very useful in letting me know how close I was getting to the Fox. I pay very little attention to it when the attenuation levels are 0, 1 or 2 but, wake up when I see a '3' and get ready to locate the Fox when I see '4' on the display. 5, 6 and 7 displays very quickly, usually within a couple hundred feet of each other.

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060930_132110-019.jpg
That's about it. See you at our next transmitter hunt.

Jim KD6DX
Schedule

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