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Radio Direction Finding
Challenge Fremont Transmitter Hunt
Starting from Fremont, California
Aug. 20, 2005
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:
Sunday, August 21, 2005
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Participants
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Fox: Don - KC6IPO
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| TEAMS (6) |
MILEAGE/Time |
PLACE |
| Ron-N7TVE |
60.2 3:15 PM |
1st |
| Jim-KD6DX |
60.2 3:15 PM |
1st |
| Bob-KF6VSE |
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| Chris-KF6VFU |
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| Don-KD6IRE and Linda-KE6BEO |
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| Gary-WB6YRU |
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Hunt date:
Aug. 20, 2005
Starting: 1:00 PM from the Fremont start point.
One (1) hidden transmitter on 146.415 MHz. 3 watts into a 19" whip, on
the ground, using a trash dumpster as a reflector and facing So. San
Francisco.
Scoring method: Mileage.
The hider was Don-KC6IPO.
The winners were Ron-N7TVE and Jim-KD6DX.My
initial bearing was 300* and the actual bearing was 313*.
Once off the Start Point Hill, I did not hear the Fox,
even as I passed by it on Hwy-880.
With a "hint" from the Fox, "The Fox is South of
Oakland, North of Fremont and in Alameda County", Ron-N7TVE and I met up
in Oakland and were able to re-think a plan to find the Fox.
We took Hwy-580 south because it was elevated and
began hearing the Fox in the area of San Leandro / Castro Valley. We
took another bearing from the Animal Shelter and acquired a direction
over the San Leandro Marina.
The signal from the transmitter was less than "1"
S/Unit, at best, until we were within a mile of the Fox. Then the signal
began to ramp up very rapidly.
Jim Sakane (KD6DX) |
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Equipment Used:
1) Arrow,
4-Element 2-Meter Yagi.
2)
VK3YNG, VHF Sniffer MK4. 2-Meter Receiver and U-R-Here radio, with
built-in 10-step attenuator.
3) Doppler Systems,
Doppler, with an Icom
R10 Receiver, modified
for RSSI S-Meter Indication.
4) Garmin, 2610 GPS
and Maps. |
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Bob-KF6VSE wrote:
From the top of the hill (415ft) at Fremont I got very weak vertical
and a much stronger but broader horz. signal from the San Burno Mt. I
concluded he must be blocking the vertical somehow and the horz. was
being helped and spread across the bay by the flat salt water. So the
source had to be near the waters edge to aid the strong horz. As I
started north on the flat I heard nothing, as expected, so I headed to
my secret high point (600ft). From here I got enough vertical to turn
on the first 15db att. and I got a correct bearing within 1 degree. I
think I was in the lead at this point.
Time for a big mistake. I decided to cross the bay to Candlestick or
Hunters point. The traffic was bad so by the time I realized I was on
the wrong side of the bay, and got back on the east side within a few
block of the fox, it went off.
Bob KF6VSE
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