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:
Roy Lewallen wrote:

What you should look for is small plasic-encased bumps (each enclosing
a coil) or obvious coiled sections spaced every few inches along the
antenna's length. If it has those, it's probably a collinear like Tom
says, and will be omnidirectional broadside to the antenna. If it
doesn't, and is just a straight piece of wire or rod, it's directional
nearly in the direction of the wire like Richard said.


You won't see that on these colinears, the radome surrounding them
covers it up. I am thinking they may be the coax style colinears, which
would not have the coils.

tom
K0TAR

Ah, good points. I hadn't considered either a coaxial (Franklin)
collinear or a radome. In that case, I can't think of an easy way to
tell except by pointing the antenna in the direction of a known signal
and seeing if it gets better (not a collinear) or worse (collinear).
Unless, of course, the manufacturer and model number are known or visible.

Roy Lewallen, W7EL

Roy Lewallen wrote:

Ah, good points. I hadn't considered either a coaxial (Franklin)
collinear or a radome. In that case, I can't think of an easy way to

And why does the world spell colinear collinear? It's not col-linear
it's co-linear. Makes no sense to me.

tom
K0TAR

Tom Ring wrote:

Roy Lewallen wrote:

Ah, good points. I hadn't considered either a coaxial (Franklin)
collinear or a radome. In that case, I can't think of an easy way to


And why does the world spell colinear collinear? It's not col-linear
it's co-linear. Makes no sense to me.


For instance, we don't say colaxial cable.

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

Tom Ring wrote:

And why does the world spell colinear collinear? It's not col-linear
it's co-linear. Makes no sense to me.

tom
K0TAR

C'mon now, since when was English logical, in spelling, punctuation,
grammer, or usage? You can't be too hard on a language in which slim
chance and fat chance mean the same thing, and wise man and wise guy are
nearly opposites.

Roy Lewallen, W7EL
-- often rightly accused of being one of the latter of the latter

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