CM9's are pretty reliable, but when they have failed for me it is usually with the receive going out. The receive signal will drop about 10db.
Keep in mind that with a link you have to figure out which side is giving you the trouble. It could be either tower that has the problem. If it was the CM9 then I would think you would have a signal on one side that was better than the other. If the signals are the same on both ends then there is something that is attenuating both the transmit and receive signals. The only things in common would be pigtail, lmr400 and antenna feedhorn. But it could be on either tower. LaRoy McCann Data Technology Mark McElvy wrote: > They have had radome covers since installed > > Mark > > > -----Original Message----- > From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On > Behalf Of jp > Sent: Monday, October 26, 2009 3:37 PM > To: WISPA General List > Subject: Re: [WISPA] Link stability > > I'd change the LMR jumper and/or feedhorn. There's a strong chance there > > is water in the jumper and changing it might fix it. There's also a > chance that the feedhorn has failed. If you end up changing the > feedhorn, consider putting a radome on the dish to protect the feedhorn > from weather. It's not necessary, but it is additional protection. > > On Mon, Oct 26, 2009 at 02:39:47PM -0500, Mark McElvy wrote: > >> I have a wireless backhaul link that is not as stable as I would like. >> It is a 15.5 mile shot that has been up for 3 years. MT/CM9/32db dish >> > on > >> both ends. On a clear day I am only seeing a -83 on each end. All the >> radio equip was replaced April 08 due to lighting, still have the >> original 3ft LMR-400 and antenna. I seem to remember the signal being >> > in > >> the -70 range prior to the lightning replacements. >> >> >> >> Right now the link is down with random reconnects with a -92 and then >> > it > >> will drop again. Weather is misty thick and overcast. I kinda of have >> > a > >> twofold question, could the weather be attenuating the signal enough >> > to > >> drop the connection? I think yes. Second, could I have a >> weakened/damaged antenna causing the general drop in signal? >> >> >> >> Mark >> >> >> >> >> >> >> > ------------------------------------------------------------------------ > -------- > >> WISPA Wants You! Join today! >> http://signup.wispa.org/ >> >> > ------------------------------------------------------------------------ > -------- > >> >> WISPA Wireless List: wireless@wispa.org >> >> Subscribe/Unsubscribe: >> http://lists.wispa.org/mailman/listinfo/wireless >> >> Archives: http://lists.wispa.org/pipermail/wireless/ >> > > -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
