I have no luck with any low power unlicensed signal penetrate even a
small branch of pine needles.
Pine is the death of unlicensed anything.
Burn the forest down or clear cut. :)
On 2/17/2016 4:09 PM, Rory Conaway wrote:
So given this scenario, would 2.4GHz be better? I can use 5GHz inside
the houses.
Rory
*From:*Af [mailto:[email protected]] *On Behalf Of *Chuck McCown
*Sent:* Wednesday, February 17, 2016 2:57 PM
*To:* [email protected]
*Subject:* Re: [AFMUG] Cambium 450i 900Mhz
I have not measured one, but if someone has a pine tree nearby and an
ohm meter, measure the resistance of the needle. Make sure you jam
the probe into the interior of the thing.
I am guessing that the water content of the needle absorbs some of the
RF energy al la a microwave oven. But anecdotal evidence over the past
10-15 years has shown that pine trees are worse than others so if the
needle itself has a fairly low resistance, like 100 ohms, it is acting
like a dipole with a termination resistor. That is really going to
suck up the signal.
Stealth aircraft have microwave absorbing foam on some of their
surfaces that operate by similar principles.
*From:*Sean Heskett <mailto:[email protected]>
*Sent:*Wednesday, February 17, 2016 2:13 PM
*To:*[email protected] <mailto:[email protected]>
*Subject:*Re: [AFMUG] Cambium 450i 900Mhz
the wavelength of 900Mhz is ~33.3cm so a quarter wave length is
~8.33cm (~3 1/4 inch). Ponderosa pine needles (and many other pine
needles) are around the same 3 1/4 inch length
https://en.wikipedia.org/wiki/Pinus_ponderosa
so with water in the needles you have a big 900Mhz RF
scattering/reflector ;-)
-Sean
On Wed, Feb 17, 2016 at 1:47 PM, Sam Lambie <[email protected]
<mailto:[email protected]>> wrote:
So if you have a minute to please explain how evergreen trees are
terrible on 900 mhz, I would greatly appreciate it.
On Wed, Feb 17, 2016 at 1:14 PM, Chuck McCown <[email protected]
<mailto:[email protected]>> wrote:
Ponderosa? Fir? Cedar?
The length of the needles matter.
*From:*Rory Conaway <mailto:[email protected]>
*Sent:*Wednesday, February 17, 2016 12:51 PM
*To:*[email protected] <mailto:[email protected]>
*Subject:*[AFMUG] Cambium 450i 900Mhz
Realistically, what kind of distances do you get through these types
of trees?
*Rory Conaway **• Triad Wireless •**CEO*
*4226 S. 37^th Street • Phoenix • AZ 85040*
*602-426-0542 <tel:602-426-0542>*
*[email protected] <mailto:[email protected]>*
*www.triadwireless.net <http://www.triadwireless.net/>*
“The ultimate measure of a man is not where he stands in moments of
comfort or convenience, but where he stands at times of challenge or
controversy” – Martin Luther King
--
--
*Sam Lambie*
Taosnet Wireless Tech.
575-758-7598 <tel:575-758-7598> Office
www.Taosnet.com <http://www.newmex.com>
--
