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Transmitter Hunting in the San Francisco Bay Area
Pack-A-Lunch Radio Direction Finding
June 29, 2002

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

Story by: Jim-KD6DX
Photographs by: Jim-KD6DX
Resized and edited with Thumbs-Plus 5.01
& Photo Shop 7.0
From 2560x1920 to 800x600 and highly compressed (50%).
Nikon CP5000

Last updated: Sunday, September 04, 2005

THE FOXES

Ron-N7TVE and Chantel

PARTICIPATING HUNTERS
Henry KF6PCEBill KF6QGK
Jim KD6DX
Rich-KN6FW, Henry-KF6PCE, Bill-KF6QGK and Joan-KF6QGJ.
Paul Shinn, Jim-KD6DX, Johnathan-KG6KWT and Nicholas.
 

Participants

Foxes: Ron-N7TVE and Chantel

TEAMS (4)

Mileage

Arrival

Place

Rich-KN6FW 33.1 11:32 AM 1st
Henry-KF6PCE, Bill-KF6QGK and Joan-KF6QGJ 33.7 11:41 AM 1st 10% Rule
Paul Shinn 36.8 11:40 AM 2nd
Jim-KD6DX, Johnathan-KG6KWT and Nicholas 37.3 11:27 AM 2nd 10% Rule

 

map1.gif
Overall GPS Track & Bearing
Thanks Ron-N7TVE, for a very enjoyable transmitter hunt. The lunch and tour at the Jelly Belly Factory was great.

The TOPO maps to the left show my GPS track from the Pleasanton Start Point to the Fox Transmitter and a terrain profile (elevation) relative to the route I took.

Finally, I'm starting to put together my experiences in mountainous transmitter hunting. Although this was a relatively straight forward t-hunt, there were area's where my Doppler pointed at reflections.

Every time I was in a low spot, between mountains, the Doppler pointed at the tallest peak (reflection). I found switching my Doppler to non-filtered, raw data, I was able to discern reflections from true direction. As long as I was moving, a reflected direction fluttered multiple Doppler LED's. True directions showed up on the Doppler as a single or at most two lit LED's. (Keep in mind, the AHHA Doppler has 50 LED's).

Also, take at least two beam bearings. Stay away from the foothills, try for high points in the clear or at least flat spots in the clear. The key here is "in the clear, away from foothills". Then stay on your beam bearings, using the Doppler, only when the Doppler stabilizes, displaying 1 or 2 LED's.

The U-R-Here radio is indispensable, I use an Icom R3 with it's four built-in attenuators. Attenuation 0 through 3 were used to justify my belief I was traveling in the correct direction, towards the Fox. Attenuation 4 meant, slow down and start deciding on which side road to take.

map2.gif
Fox Transmitter
mapprofile.gif
Profile Map
20020629_100257.jpg
Rich-KN6FW
Henry-KF6PCE
20020629_101157.jpg
Paul Shinn setting up
20020629_113129.jpg
Rich-KN6FW arriving
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The Transmitter
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Nicholas, Johnathan
KG6KWT
20020629_113509.jpg
Ron-N7TVE the FOX.
20020629_113923.jpg
Paul Shinn Arriving
Equipment I used:
1) 4-element beam. (Can't live without it)
2) AHHA MicroFinder Doppler.
3) Garmin StreetPilot-III: Street level GPS mapping.
4) Laptop Computer: TOPO map to draw bearings.
5) Icom IC-R3, U-R-Here radio. (Can't live without it)
6) Mobile radio, Standard C5900DA. Listen to the fox frequency and talk-in communications channel (simplex).

CONCLUSION:
1) Take BEAM bearings to the Fox and plot them.
2) Icom IC-R3, U-R-Here radio. (How close are you).
3) When your in a depression, ignore Doppler directions, use your 'in the clear' BEAM bearing.
4) Maps are very important. I use the Garmin StreetPilot-III GPS map.

Next transmitter hunt:
Sat. July 6, 6:00 PM, FREMONT HUNT.
Talk-in 147.015(+) PL103.5
Jeff KD6TOJ is the fox.

Jim Sakane (KD6DX)

20020629_114332.jpg
Finishing up.
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Jelly Belly
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20020629_121936.jpg
20020629_122040.jpg
20020629_122040.jpg
20020629_122054.jpg
Side Entrance
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Jelly Belly
Cafeteria
 
20020629_123627.jpg
Jelly Belly
Shaped Burger
20020629_123655.jpg
20020629_123655.jpg
 
20020629_123720.jpg
20020629_123720.jpg
20020629_130921.jpg
Jelly Belly Tour.
 
20020629_130944.jpg
20020629_130944.jpg
 

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