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Transmitter Hunting in the San Francisco Bay Area
SPECIAL JAMMER HUNT
March 30, 2002

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Story by: Jim-KD6DX
Photographs by: Jim-KD6DX
Resized and edited with Thumbs-Plus 4.5
& Photo Shop 6.01
From 2560x1920 to 640x480 and highly compressed (50%).
Nikon CP5000

Last updated: Sunday, March 31, 2002

THE FOX

Paul Shinn

PARTICIPATING HUNTERS
Jim KD6DX

Jim-KD6DX, Rich-KN6FW and Chris-KF6VFU

 

Participants

Fox: Paul Shinn

TEAMS (3)

Notes

Jim-KD6DX Found all three transmitters, 141 miles, 5 hours. (Started at 10 AM)
Rich-KN6FW Found all three transmitters, 157 miles, 6 hours. (Started at 10 AM)
Chris-KF6VFU Found the repeater, 97 miles, 4 hours. (Started at 12 Noon)

 

map1.gif
map1
My complete GPS
track, from
start to finish.
map2.gif
map2
GPS track in Stockton.
Locating the jammer
and communicator.
 
map3.gif
map3
GPS track to the
repeater site. The back
way, not the correct
way.
I'm really glad I participated in Paul's realistic JAMMER hunt. Believe me, learning how to hunt these elusive transmitters can only be experienced.

Starting out this hunt, Rich-KN6FW used his interferometer setup and read a good initial bearing of 60* to the communicator and the jammer. (The actual bearing was 58*). I used my 4-element 2-meter beam and read an initial bearing of 52*. Accuracy aside, I had a difficult time reading both transmitters. Since both transmitters had different signal strengths, I had to add or subtract attenuation from my beam and since both transmitters were intermittent and transmitting mostly at the same time, I could not dial attenuation in quick enough.

Trying to drive a path along my initial bearing, I ended up at a large building in downtown Stockton, where the communicator was located. Using my beam setup with the Scout-40 frequency counter, I pointed up the building and found the strongest signal coming from atop the roof on the back side.

Driving away from the Communicator, I zeroed in on the jammer, transmitting from his house, not to far from the communicator. That was pretty easy.

Finding the repeater was a different story, I initially had a difficult time finding a road at did not dead-end. After multiple "Not a Through Road" signs on surface streets, I decided to hit the freeway. I drove south on freeway-5 and when I thought I finished driving, I drove some-more. Eventually my Doppler started to turn right, indicating I should exit the freeway. Taking the highway-132 exit I drove down Chrisman Rd (a dead-end road), not more than 1/2 mile from the repeater.

Not wanting to ask Paul for hints, I saw a possible back way in on my GPS map and drove around further south. This turned out to be a dirt road and to further make matters worst, it didn't lead to the repeater site.

I drove around un-chartered  territory until a farmer asked if I needed help and I was able to followed him up to the repeater.

Paul hosted a really good hunt. The equipment was very elaborate and the jammer setup was extremely realistic. If Paul does another one of these hunts, you have to participate.

Equipment I Used:

1) Icom R3 (Receiver): used for both my initial bearing receiver and my U-R-Here radio.
2) Arrow 4-element (Beam): used for my initial bearing and close-in direction finder.
3) Optoelectronics Scout-40 (frequency counter): used as my close-in receiver.
4) Garmin StreetPilot-III (Maps): used to plot the shortest distance to the transmitter.
5) AHHA Microfinder-I (Doppler): used to instantly know the direction of the transmitter.
6) Standard C5900A (Mobile radio): used to scan both transmitter frequencies and talk on the talk-in channel.

 

20020330_095959.jpg
20020330_095959

Start point,
Pleasanton.
20020330_100050.jpg
20020330_100050

Rich-KN6FW initial
60* bearing.
20020330_105523.jpg
20020330_105523

Drive along the bearing.
20020330_122817.jpg
20020330_122817

Location of the
communicator at work.

20020330_122909

I think the transmitting
antenna was on
the roof.
20020330_124537.jpg
20020330_124537

Location of the jammer.
20020330_144718.jpg
20020330_144718

On my trek to the
repeater site, I found a
dead cow.

 
20020330_144641.jpg
20020330_144641

Closer look at the cow.

20020330_151035
Repeater site

20020330_151054

Repeater antenna.

20020330_151323
Bullet holes to gain
entry into the building.
20020330_151155.jpg
20020330_151155
Bullet holes in the old FM broadcast
transmitter.
20020330_151235.jpg
20020330_151235

Paul's 2-meter
repeater.

20020330_151306

Paul's new FM
broadcast transmitter.
20020330_154918.jpg
20020330_154918

Paul checking out the
broadcast transmitter
(exciter).
20020330_155430.jpg
20020330_155430

Chris-KF6VFU
arriving.
20020330_155438.jpg
20020330_155438

Rich-KN6FW arriving.
20020330_160839.jpg
20020330_160839

Rich-KN6FW, Paul and
Chris-KF6VFU.
20020330_170732.jpg
20020330_170732

Paul, taking down the
2-meter repeater
antenna.
20020330_180056.jpg
20020330_180056

Chris, Paul and
Rich, talking
outside the radio
building.
20020330_180122.jpg
20020330_180122
View from the hill
top.
20020330_180135.jpg
20020330_180135

View from the hill top.
20020330_180222.jpg
20020330_180222

Chris, Paul and Rich.
 

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