thewisperer
Premium
join:2008-01-16
 ·TekSavvy Solutions..
| can get a link through 1000 feet of foliage with 900!
We have been trying to do a 1000 foot link with two XR9's through 1000 feet of foliage. It works but no better than
-85 regardless of the antenna's we tried
Tried panel antennas on both ends: tried sector to grid: tried grid to grid all with very little success.
switched channels, tried vertical, horizontal etc.
noise floor is in mid 90's.
put up the grids today and got -84 and we will see if it holds.
Both ends are pole mount on the roof of a two storey house.
Conclusion: if I look back at my other thread of 5.8 working through trees, you just have to try it to see if it works.
This one does not!
Any suggestions or questions? I have pics of both ends but did not bother to post them. |
|
mtroup
Marty
Premium
join:2007-06-28
Hermitage, AR | Have you tried using yagi's?
I have great success with M2 14dBi and 17dBi versions. |
|
thewisperer
Premium
join:2008-01-16 | I am located in Quebec Canada and have always been affraid of icing problems in the wintertime. Maybe I'm wrong... |
|
Gerard780
Premium
join:2002-01-25
Simpsonville, KY | reply to thewisperer
Have you tried 5 mhz channels? What kind of foliage is it?
-Gerard |
|
EMC_guy
join:2007-10-13
Sharbot Lake, ON
 ·Rogers Hi-Speed
| reply to thewisperer
said by thewisperer  :We have been trying to do a 1000 foot link with two XR9's through 1000 feet of foliage. Are they evergreen foliage? 900Mhz link with even 1W EIRP should work through 1km (3000ft) of typical deciduous foliage. Try setting both radios to lowest modulation (BPSK mode for XR9) to maximize sensitivity. |
|
wolfcreek
join:2003-12-02
Pagosa Springs, CO | reply to thewisperer
how high are the radios. The fresnel zone on 900 is quite large. Beign below that adversely affects its tree penetration |
|
thewisperer
Premium
join:2008-01-16
·TekSavvy Solutions..
| reply to thewisperer
yes we did try 5 mhz channels.
the forest is a mix of good Canadian forest, some pine trees
Foliage starts about thirty feet from antenna
The height is roof of two storey house (tripod and ten foot pole)
we now have two grids 15db pac wireless with signal at -85
but I'm not impressed |
|
John Galt
Premium
join:2004-09-30
Oceanside, OR
| reply to thewisperer
said by thewisperer :Both ends are pole mount on the roof of a two storey house. You don't have enough height. Consider changing at least one end to a higher elevation.
900 MHz is no "magic bullet". While it might perform better than 2.4 GHz, you still have to be careful how you deploy it.
I have pics of both ends but did not bother to post them.
Uh...might be helpful. Better than "word pictures", eh?
--
A is A |
|
thewisperer
Premium
join:2008-01-16
·TekSavvy Solutions..
| I know I don't have enough height John but a tower on each end was not feasible in this case. I just thought that 1000 feet would be doable. -85 is ok but no fade margin...
The pic was not posted cause I thought everyone could envision what looking at a bunch of trees thirty feet away looks like 
thanks though always appreciate your experience and comments |
|
John Galt
Premium
join:2004-09-30
Oceanside, OR
edit:
July 18th, @07:17AM
| said by thewisperer :The pic was not posted cause I thought everyone could envision what looking at a bunch of trees thirty feet away looks like LOL
I was thinking more along the lines of the house, the mast and radio.
Ten more feet on one end might do it for you.
--
A is A |
|
superdog
I Need A Drink
Premium,MVM
join:2001-07-13
Lebanon, PA
 ·WaveCrazy.Net
| reply to thewisperer
said by thewisperer :The pic was not posted cause I thought everyone could envision what looking at a bunch of trees thirty feet away looks like LMAO!!!!.
--
»www.wavecrazy.net
|
|
Raven1275
join:2001-03-10
Island Pond, VT
| reply to thewisperer
It might work better with the antennas down to about 15-20 feet AGL on the side of the house. Also, try turning the antenna on one end to change polarity as it may get skewed going through all that forest. We have found white pine needles here in the northeast to be very absorbent in the 900mhz band, so getting somewhat under the main canopy may help.
Best of luck... |
|
