Do you have a sketch of the harness a guy might use to feed that 8
dipole colinear array? Remember, this colinear antenna is mounted on the
back of a Lap Top Computer for WiFi use.
____________

Sorry, not for that application.

Richard,

The antenna that I am looking to build is not for Wi-Fi, but for 840mHz
range and will be mounted outside on a pole about 25 feet high.

Tnx

Jim
"Richard Fry" wrote in message
...
Do you have a sketch of the harness a guy might use to feed that 8
dipole colinear array? Remember, this colinear antenna is mounted on
the back of a Lap Top Computer for WiFi use.
____________

Sorry, not for that application.

But if you feed a coaxial collinear at the center instead of at an end,
the top and bottom portions will have tilts in opposite directions, and
the maximum of the pattern will remain perpendicular to the axis of the
antenna, at least over a broad range of frequencies. The gain will
change, but not drastically; matching properly to the feedpoint over
the range of frequencies is likely going to be the bigger issue.

And if the OP puts the gain antenna on a panel which can be tilted at
various angles, the performance may well be far from what he really
wants. I'd suggest a small stand of some sort that will keep the
antenna in a fixed position, if the panel can move.

Cheers,
Tom

Hello Jim I built a 910mhz coax antenna using 6 - 1/2 wave elements,
1/4 wave on bottom and the top. I used 3/8" copper hardline
instead of coax i had to tried to adjust for a faster .88 VP but found
using the same length as required for RG58 worked just as well.
Initally i did not put the antenna up because at ground level it did
not work very well on recieve, i was going to throw it out but desided
to put it up anyway. It really made a big difference once it was in
the air @ 25', it works much better than a Sinclair commercial omni i
had been using,

Tucker,

Thanks, I found that you have to get it up in the air also for it to work.
It does wokr better than a 1/4 wave antenna.

Jim
wrote in message
ups.com...
Hello Jim I built a 910mhz coax antenna using 6 - 1/2 wave elements,
1/4 wave on bottom and the top. I used 3/8" copper hardline
instead of coax i had to tried to adjust for a faster .88 VP but found
using the same length as required for RG58 worked just as well.
Initally i did not put the antenna up because at ground level it did
not work very well on recieve, i was going to throw it out but desided
to put it up anyway. It really made a big difference once it was in
the air @ 25', it works much better than a Sinclair commercial omni i
had been using,