LOL...Jack, I love the way you were able to troubleshoot his INDOOR link. Very informative. My hat's off to ya. Kudoos
--- On Tue, 3/3/09, Jack Unger <[email protected]> wrote: > From: Jack Unger <[email protected]> > Subject: Re: [WISPA] Link problem > To: "WISPA General List" <[email protected]> > Date: Tuesday, March 3, 2009, 5:39 PM > <div id=yiv703214689><!DOCTYPE html PUBLIC > "-//W3C//DTD HTML 4.01 Transitional//EN"> > <html> > <head> > > </head> > > OK - well that changes EVERYTHING! Change the > LMR-400 jumper on the > end with the low RSSI. <br> > <br> > <br> > Blair Davis wrote: > <blockquote type="cite"> > > A typo.... It should have read 5.280GHz...<br> > <br> > Sorry for the confusion.<br> > <br> > Jack Unger wrote: > <blockquote type="cite"> > > > Blair, <br> > <br> > Well, because the 5.180 GHz range is only legal for indoor > use in the > U.S., your problem could be one of the following. > <br> > <br> > a) The signal over the 1 km indoor path is bouncing off too > many > interior walls and creating unpredictable multipath > effects. Check to > see if any new interior walls have been constructed > recently and, if > so, order them removed immediately. If they are in the > "critical path", > don't hesitate to immediately knock them down yourself! > In the future, > plan to cover such long indoor paths with at least 3 hops. > <br> > <br> > b) Somebody moved some large item somewhere in the 1km-long > warehouse > (or whatever other HUGE building) that you have deployed > inside of. > That huge moved item (perhaps a large crane or boat) is > partially > blocking the signal path. The item may be closer to one end > of the link > thereby causing the lower RSSI at the other end of the > link. Walk the > path to locate any large objects and have them relocated. > <br> > <br> > c) The building may have become overheated at one end > causing the cm9 > at that end to overheat and go out of spec causing low > transmitter > output power. Check the building temperature at the end > OPPOSITE the > end where the RSSI is low and correct it. <br> > <br> > d) A bird may have gotten into the building (don't > laugh, I've seen it > happen before, especially in very large buildings) and > built a nest in > the feedhorn of one grid antenna thereby introducing 9 dB > of > attenuation of the signal strength on receive. Visually > inspect both > antennas and remove any bird nests. Try to humanly trap the > bird if at > all possible and release it outdoors with a firm verbal > command to "go > home and don't come back". <br> > <br> > e) The clear and cold weather outdoors may have caused a > buildup of > static electricity indoors causing static damage to the > front end of > the cm9 which is experiencing the RSSI decrease. The > chances of this > are high especially if you failed to install lightning > arrestors on > both ends of the indoor link. <br> > <br> > f) Last but not least (and this is VERY IMPORTANT) - > don't even think > about trying to figure out what might have happened to > cause the RSSI > decrease until you go into that warehouse (or whatever that > building > is) and CHANGE OUT EVERY PIECE OF EQUIPMENT ON BOTH ENDS OF > THE LINK. > Many, many WISPs have been using this method to > "fix" bad links for > many years. If so many WISPs are using this ("swap > before you stop") > method, there must be a very good reason why!<br> > <br> > Good luck and good birding!!<br> > <br> > jack<br> > <br> > <br> > Blair Davis wrote: > <blockquote type="cite">Hi > all...<br> > <br> > All of a sudden, a PtP link that has been stable, -79 rssi > or so > bi-directional has become very asymmetric.<br> > <br> > I now get -79 rssi/-98 noise floor at one end and -88 > rssi/-95 noise > floor at the other...<br> > <br> > Link is a pair of cm9's, 20db grids, 5.180GHz, range > 1km, clear LOS. > 3ft lmr-400 radio to antenna at one end, 60ft lmr-400 radio > to antenna > at other end.<br> > <br> > Any ideas? <br> > <br> > Clear and cold here, 27F. Dry since last > Thursday...<br> > <br> > Thanks.<br> > <br> > Blair<br> > <br> > <br> > <pre><hr size="4" > width="90%"> > > > -------------------------------------------------------------------------------- > WISPA Wants You! Join today! > <a rel="nofollow" > class="moz-txt-link-freetext" > target="_blank" > href="http://signup.wispa.org/";>http://signup.wispa.org/</a> > -------------------------------------------------------------------------------- > > WISPA Wireless List: <a rel="nofollow" > class="moz-txt-link-abbreviated" > target="_blank" > href="mailto:[email protected]";>[email protected]</a> > > Subscribe/Unsubscribe: > <a rel="nofollow" > class="moz-txt-link-freetext" > target="_blank" > href="http://lists.wispa.org/mailman/listinfo/wireless";>http://lists.wispa.org/mailman/listinfo/wireless</a> > > Archives: <a rel="nofollow" > class="moz-txt-link-freetext" > target="_blank" > href="http://lists.wispa.org/pipermail/wireless/";>http://lists.wispa.org/pipermail/wireless/</a></pre> > </blockquote> > <br> > <pre class="moz-signature">-- > Jack Unger - President, Ask-Wi.Com, Inc. > Serving the Broadband Wireless Industry Since 1993 > Cisco Press Author - "Deploying License-Free Wireless > WANs" > WISPs - Do you know where your customers are? > For wireless coverage mapping see <a > rel="nofollow" > class="moz-txt-link-freetext" > target="_blank" > href="http://www.ask-wi.com/mapping";>http://www.ask-wi.com/mapping</a> > FCC Lic. #PG-12-25133 LinkedIn Profile <a > rel="nofollow" > class="moz-txt-link-rfc2396E" > target="_blank" > href="http://www.linkedin.com/in/jackunger";><http://www.linkedin.com/in/jackunger></a> > Phone 818-227-4220 Email <a rel="nofollow" > class="moz-txt-link-rfc2396E" > target="_blank" > href="mailto:[email protected]";><[email protected]></a> > > > </pre> > <pre><hr size="4" > width="90%"> > > > -------------------------------------------------------------------------------- > WISPA Wants You! 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Join today! > <a rel="nofollow" > class="moz-txt-link-freetext" > target="_blank" > href="http://signup.wispa.org/";>http://signup.wispa.org/</a> > -------------------------------------------------------------------------------- > > WISPA Wireless List: <a rel="nofollow" > class="moz-txt-link-abbreviated" > target="_blank" > href="mailto:[email protected]";>[email protected]</a> > > Subscribe/Unsubscribe: > <a rel="nofollow" > class="moz-txt-link-freetext" > target="_blank" > href="http://lists.wispa.org/mailman/listinfo/wireless";>http://lists.wispa.org/mailman/listinfo/wireless</a> > > Archives: <a rel="nofollow" > class="moz-txt-link-freetext" > target="_blank" > href="http://lists.wispa.org/pipermail/wireless/";>http://lists.wispa.org/pipermail/wireless/</a></pre> > </blockquote> > <br> > <pre class="moz-signature">-- > Jack Unger - President, Ask-Wi.Com, Inc. > Serving the Broadband Wireless Industry Since 1993 > Cisco Press Author - "Deploying License-Free Wireless > WANs" > WISPs - Do you know where your customers are? > For wireless coverage mapping see <a > rel="nofollow" > class="moz-txt-link-freetext" > target="_blank" > href="http://www.ask-wi.com/mapping";>http://www.ask-wi.com/mapping</a> > FCC Lic. #PG-12-25133 LinkedIn Profile <a > rel="nofollow" > class="moz-txt-link-rfc2396E" > target="_blank" > href="http://www.linkedin.com/in/jackunger";><http://www.linkedin.com/in/jackunger></a> > Phone 818-227-4220 Email <a rel="nofollow" > class="moz-txt-link-rfc2396E" > target="_blank" > href="mailto:[email protected]";><[email protected]></a> > > > </pre> > > </html> > </div> > > -------------------------------------------------------------------------------- > WISPA Wants You! 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