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Simple
system for Monitoring Weather Satellites:
FM Receiver For 134 -
141MHz
(A double conversion
superhetrodyne with pll)
IT'S
EASY TO CAPTURE REALTIME IMAGES LIKE THIS DIRECTLY FROM SPACE ON YOUR
PC!
"LOOKING AT THE EARTH FROM
SPACE"
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Back ]
Last update:
01. 0 1.
2007
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Quadrafilar Helix Antenna
The
best antenna for 137.5 MHz is the socalled Quadrifilar Helix antenna (QFHA).
You have to construct it yourself.
Paul Hayes
QFH Antenna (professional
design)
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Quadrafilar Helix
(QFH, QFHA, QHA): the best performing antenna...:
Børre Ludvigsen137
MHz APT
QUADRAFILAR ANTENNA
RQHA
(outstandingly researched, best
performing antenna design -- instructions for building
yourself),
PHQFH
(popular, excellent performing,
home-built antenna with outstanding instructions, may be able
to be purchased completed),
The Bill Sykes and Bob Cobey QFH
(Taming the Quadrifilar
Helical Antenna: detailed instructions for building a QFH
antenna from G2HCG and G0HPO), and
OK1MOW (handsome
modification...)
Chris van Lind portable QFH
(portable, easy to build
QFH from coax and PVC conduit).
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QFHA 1 coax + wood - simple
design |
QFHA 2 coax + wood - simple
design |
QFHA 3 PVC tube + coax +
Al wire |
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Copyright
© 1999 - 2007 emgo
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