"Tom Ring" wrote in message
. ..
Richard Clark wrote:
On 10 Sep 2005 10:42:15 -0700, wrote:


I tried an existing omni antenna
that is aboout 30" long and a long cable and the signal was
nonexistant. With the short cable and that same antenna I was using, I
got some hotspots tuned in.


Hi Peter,

This 30" antenna is easily ten times too long. It will be very
directional, and only if you point it (like a rapier) towards the
transmitter. As it stands, your favored direction is straight up.
This, of course, is strictly counter to your stated desire for "omni."

Take a cue from the products offered for this class of communication.
Their antennas are short for reasons that go beyond aesthetics. Take
heart that you are on the right path. Antenna height (distance above
you, not length) is always an advantage.

73's
Richard Clark, KB7QHC

Which means it was a colinear. It is long for a reason.

Similar antennas are vailable at CompoUSA and most other computer stores.

tom
K0TAR

Hi Tom

Isnt 30 inches a little too long for a colinear at 2.4 GHz? I'd guess
that the antenna that Peter has hooked up is a marine radio whip. I'll be
interested in reading more about what he is doing, and where the 30 inch
long antenna came from.

Jerry

Jerry Martes wrote:

Hi Tom

Isnt 30 inches a little too long for a colinear at 2.4 GHz? I'd guess
that the antenna that Peter has hooked up is a marine radio whip. I'll be
interested in reading more about what he is doing, and where the 30 inch
long antenna came from.

Jerry

Well, he did specifically state WiFi, so I went with that.

And a colinear can be as long as you'd like, they just don't keep
gaining gain very well after a certain point.

tom
K0TAR

"Tom Ring" wrote in message
. ..
Jerry Martes wrote:

Hi Tom

Isnt 30 inches a little too long for a colinear at 2.4 GHz? I'd guess
that the antenna that Peter has hooked up is a marine radio whip. I'll
be interested in reading more about what he is doing, and where the 30
inch long antenna came from.

Jerry

Well, he did specifically state WiFi, so I went with that.

And a colinear can be as long as you'd like, they just don't keep gaining
gain very well after a certain point.

tom
K0TAR


Tom

I must be out of touch with the current technology. I thought a 6
wavelength long colinear was too long for practical reasons. It seems that
beam squint with frequency change would rule out a 6 wavelength long
colinear.

Jerry

On Sat, 10 Sep 2005 20:50:09 -0500, Tom Ring
wrote:

And a colinear can be as long as you'd like, they just don't keep
gaining gain very well after a certain point.

Hi Tom,

And 30 inches (more than 6 wavelengths long?) would seem to have long
met diminishing returns. Given the prospects of it bobbing on the
ocean, with a successively dipping and rising critical elevation gain
- well that sounds like no kind of solution to a problem.

73's
Richard Clark, KB7QHC

Richard Clark wrote:

Hi Tom,

And 30 inches (more than 6 wavelengths long?) would seem to have long
met diminishing returns. Given the prospects of it bobbing on the
ocean, with a successively dipping and rising critical elevation gain
- well that sounds like no kind of solution to a problem.

73's
Richard Clark, KB7QHC

And before anyone mentions the downtilt or polarization, here's a
horizontally polarized one with no downtilt. Unfortunately no pattern
shown for this one, though.

http://www.firstmilewireless.com/prod_ant2oh13.html

tom
K0TAR

Hi Tom

It appears that Peter, the original poster, has re-thought his project and
decided to not include this group in his planning.
I want to thank you for making me aware of the long colinears you searched
out to inform us about.

Jerry



"Tom Ring" wrote in message
. ..
Richard Clark wrote:

Hi Tom,

And 30 inches (more than 6 wavelengths long?) would seem to have long
met diminishing returns. Given the prospects of it bobbing on the
ocean, with a successively dipping and rising critical elevation gain
- well that sounds like no kind of solution to a problem.

73's
Richard Clark, KB7QHC

And before anyone mentions the downtilt or polarization, here's a
horizontally polarized one with no downtilt. Unfortunately no pattern
shown for this one, though.

http://www.firstmilewireless.com/prod_ant2oh13.html

tom
K0TAR