Pictures of Ivan's 137MHz version
Even though the face of the builder doesn't exactly reflect it,
these were his words after a test:
It works *AMAZINGLY* !
First of all it's really omnidirectional, no more "point and follow"
the satellite any more, second .. "I don't know how it does it" but
the noise/signal ratio gets almost zero when the satellite is
"close enough", the doppler effect is almost totally cancelled,
you can pick the satellite "from when it appears at the horizon
until it gets down".
The difference between the QFH and a simple "stilus antenna" is
*HUGE*.
Have a look at
Ivan's blog...
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Even though the face of the builder doesn't exactly reflect it,
these are his words after a test:
It works *AMAZINGLY* !
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Here it begins, plastic pipes, tools, lot of paper with drill
templates printed on, ruler (in MILLIMITERS), tape, etc. etc. .. |
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Here the drilling technique, templates printed on paper "glued" to
the surface, mini holes then cut all and file/sandpaper/etc. ..
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Some finished holes (still to clean a bit), the smaller holes are
for the coax cable. |
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The "outer loop" completed, we were testing how the loop has to be
made and the wire lenght with a "fake wire".
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At 9.45 PM we had to stop, pub time, the antenna is 90% completed,
it only misses to pass the wire and do a couple of solderings and
is done, here with just one loop on (we were testing the thing). |
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Another view of it.
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NOAA-15 image... Signal is clearly quite strong - the noise
in the white areas (clouds and white telemetry bands at the left)
is due to the insufficient bandwidth of the receiver (note from
the 'editor' jc) |
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NOAA-15
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(c) John Coppens ON6JC/LW3HAZ |
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