Re: Signs of foliage causing dropouts of signal?

Author	All Replies
stargazer @cloh.com	reply to stargazer Re: Signs of foliage causing dropouts of signal? I am using a pair of new High Gain radios with a built in 15 db antenna. There are trees and foliage in the way. The cards run at 26 dbm and I think the cutoff on the signal is around -88. I was getting upper -60's before the foliage and now get around -72 so I did not lose much signal due to the foliage. I didn't think that there would be inconsistency with the signal with trees in the way. Sometimes it will have a solid signal for a little while after a reboot then it will start losing packets or it will act like it lost the signal altogether then the signal will come back solid again. Shouldn't there be more consistency with the signal than that even through trees? I don't understand how a signal can go from -72 to nothing for a while then all of a sudden come back unless there is a problem with the radio. I have swapped out the client radio with the same results. Perhaps I will need to swap out the AP to see if that resolves the problem. I figure 900 mhz would have no problem shooting through the trees but it is more expensive. My house is on the other side of this link and I do not see serving very many clients (maybe just a handful) but since I live in this area and want to monitor the rest of the network then I would like to have the link established without spending a lot of money especially since it is not a long link. When I stated that there was no foliage, that was a typo, I meant to say that there is foliage. I have done shots through foliage before that were close in so it surprised me that this shot through the trees did not work as close as it is. I was having issues before the leaves came on as it was line of site before I had foliage.
stargazer @cloh.com	to forum · permalink · 2008-05-05 15:43:48 ·
89555781 join:2008-03-20	If you trying to shoot through trees with 2.4GHz, your results will vary despite what brand of CPE you use. The leaves can be dry and still one minute and moving the next. They may be dewy early in the morning or wet after a rain shower. 2.4GHz is a clear line of sight frequency. Trees, walls, hills etc. will all affect this. Your best bet is get above the trees.
89555781 join:2008-03-20	to forum · permalink · · 2008-05-05 17:34:16 ·
lutful Premium join:2005-06-16 Ottawa, ON ·TekSavvy Solutions..	reply to stargazer said by stargazer : I was getting upper -60's before the foliage and now get around -72 so I did not lose much signal due to the foliage. I posted a real-time graph long ago that shows upto 40dB rapid RSSI fluctuations on a windy and rainy day in mid-summer. So reliable foliage NLOS links need a receiver with ultra-fast AGC (automatic gain control) circuit.
	to forum · permalink · · 2008-05-05 22:58:28 ·


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