On Fri, 09 Jul 2004 08:37:29 -0400, jdurling@bellsouth.net (Jeff
Durling) wrote:
>
>
>On Jul 9, 2004, at 3:13 AM, Bill Pitz wrote:
>>>
>>
>> Not true. Parabolic dish antennas also radiate the signal out the
>> rear of the dish. Not nearly as far or as concentrated, but for
>> shorter links, you can easily enroll clients in the back of a
>> directional antenna... particularly parabolic dishes.
>
>Interesting, not doubting you but I wonder what factors in the dish
>itself and so fourth make them act that way. The reason i say this is
>when we have been setting up our sites the best be could do to connect
>form the rear was within about 10'. Of course when using that sort of
>parabolic dish you are trying to throw the signal further out there and
>10' isn't what you want. Maybe the solid verses the mesh makes a
>difference? Not really sure but good info to test at one point since in
>our use it wold make a difference.
I'm not really finding much, but then I'm not really looking very hard
either. If you look at the gain pattern here (this is for a yagi)
http://www.hyperlinktech.com/web/hg2415y.php
That's the type of behavior that I have typically seen out of a dish.
The gain patterns here:
http://www.hyperlinktech.com/web/hg2424g.php
Are shaped correctly, but I have always had good luck enrolling
clients behind these exact antennas. I should add that I haven't ever
done that on a production link of more than about 1/2 mile. It's
possible to enroll a mile or so away, but the signal isn't nearly as
good.
Anyway, I could go on about it for hours. I guess I've just been
playing with this stuff a little bit too long. :-) Feel free to drop
me an e-mail offlist. In the meantime, I'll stop wasting everyone's
time.
-Bill
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