Agreed. The overall cost is not that high compared to the time lost picking at it.
I'd rather test and troubleshoot at the bench. - Jerry From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of Josh Luthman Sent: Monday, February 14, 2011 10:14 AM To: WISPA General List Subject: Re: [WISPA] Strange RF disconnect problem If it were me, I would check that LMR and all that other garbage. Use the ARC 23dbi panel/enclosures. You'll lose 10dbi (less because of LMR400, connectors, pigtails, N connectors) but you'll have less to worry about when ice gets on the antenna (IME last week - none). Everything is enclosed and pretty and the mounting is easier then the grids and those stupid U bolts. Every time I've tried to swap a radio, or a board, or an antenna, or lmr400...it was a waste of time and money. Scrap the entire thing and do everything in one clean swoop. Josh Luthman Office: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373 On Mon, Feb 14, 2011 at 1:10 PM, Data Technology <w...@dtisp.com<mailto:w...@dtisp.com>> wrote: After posting I recalculated what the signal strength should be and it turns out to be mid 50's. So I guess there is defiantly wrong in the rf system some where. On 2/14/2011 12:00 PM, Data Technology wrote: > Sorry for the long post but I need some suggestions here guys. > > Customer has a 7.3 mile 5ghz link. > MT 433AH on one end and MT 411AH on the other. > Version 4.16 on both units. > Both units have MT R52Hn cards. > 28 db grids on both ends with 6-10ft lmr400 jumper. > > Signal strength is -65 to -65 on one end and -66 to -67 on the other. > CCQ is 98 to 100% > > Configured as bridge wds on one end and station wds on the other. > > > This customer is a school and when they came back from Christmas break > the link was down. > This is in a rural area and no other 5 ghz systems show up in a scan so > it is a 50/50 shot at the one that is bad. > We changed the card in one unit and that was not it so we changed the > card in the other unit and the link came back up. > It was not working 100% and would go down and up but the signal looked > ok. It was at -70 at the time. > The only way I could get it to stay up was to change to a 5meg bandwidth. > > The link finally stabilized with the 5 meg channel. > This would have to do until we could go back and check cables and > connections. > > Well it has worked ok for the most part since then but we have noticed > that when it rains > the link starts dropping out again even though the signal stays good > when it is connected. > > Sounds like water in a connection so I went yesterday to check some > connections and they look good. > Had electrical tape, mastic, and electrical tape. I actually cut open > one just to inspect and was dry. > I know it only takes one connection to cause a problem but visual > inspection of all connections looked ok. > Next trip we will have new cables and new antenna. > > After I finished messing around with the first unit the link started > going down and up. > The strange thing about this is that when it is up the signal is a solid. > About every 60 seconds the link would drop out and come right back up. > It did this for about an hour and finally stabilized. Sounds like > interference. > > Here are a few lines from both logfiles. > > 05:28:53 wireless,info 00:0C:42:62:E4:82@wlan1: disconnected, extensive > data loss > 05:29:00 wireless,info 00:0C:42:62:E4:82@wlan1: connected, wants WDS > 05:30:01 wireless,info 00:0C:42:62:E4:82@wlan1: disconnected, extensive > data loss > 05:30:10 wireless,info 00:0C:42:62:E4:82@wlan1: connected, wants WDS > 05:31:10 wireless,info 00:0C:42:62:E4:82@wlan1: disconnected, extensive > data loss > 05:31:19 wireless,info 00:0C:42:62:E4:82@wlan1: connected, wants WDS > 05:32:20 wireless,info 00:0C:42:62:E4:82@wlan1: disconnected, extensive > data loss > 05:32:28 wireless,info 00:0C:42:62:E4:82@wlan1: connected, wants WDS > 05:33:29 wireless,info 00:0C:42:62:E4:82@wlan1: disconnected, extensive > data loss > 05:33:37 wireless,info 00:0C:42:62:E4:82@wlan1: connected, wants WDS > > > feb/13 16:14:51 wireless,info 00:0C:42:62:E0:A6@wlan1: lost connection, > not polled for too long > feb/13 16:14:58 wireless,info 00:0C:42:62:E0:A6@wlan1 established > connection on 5200, SSID Hillview > feb/13 16:16:01 wireless,info 00:0C:42:62:E0:A6@wlan1: lost connection, > not polled for too long > feb/13 16:16:08 wireless,info 00:0C:42:62:E0:A6@wlan1 established > connection on 5200, SSID Hillview > feb/13 16:17:10 wireless,info 00:0C:42:62:E0:A6@wlan1: lost connection, > not polled for too long > feb/13 16:17:17 wireless,info 00:0C:42:62:E0:A6@wlan1 established > connection on 5200, SSID Hillview > feb/13 16:18:19 wireless,info 00:0C:42:62:E0:A6@wlan1: lost connection, > not polled for too long > feb/13 16:18:26 wireless,info 00:0C:42:62:E0:A6@wlan1 established > connection on 5200, SSID Hillview > feb/13 16:19:28 wireless,info 00:0C:42:62:E0:A6@wlan1: lost connection, > not polled for too long > feb/13 16:19:35 wireless,info 00:0C:42:62:E0:A6@wlan1 established > connection on 5200, SSID Hillview > > > My Conclustions are possibly 2 problems. > > 1. Water somewhere ? > I will have to check each connection and or replace jumper cable > and possibly antenna. > Has anyone seen the grid element go bad and leak? > > 2. Interference ? > Maybe need spectrum analyzer to check things out. > What is the timing of a radar signal sweep? > > Also, one tower has a lot of slack in the guy wires and it was moving a > lot more than I liked in the wind yesterday. > I think that might be a problem but I don't think it would cause it to > drop every 60 seconds. > > > If you made it this far, thank for reading. > > LaRoy McCann > Data Technology > Trumann, AR > > > > -------------------------------------------------------------------------------- > WISPA Wants You! 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