Its hard to advise on this. You'd have to test the radio on the ground connected by a attenuated coupler to know if teh radio was output powering correctly or not.
We ahve ran into this before, and the answer was always alignment. Sometimes, we simply started over from scratch, and finally fine tuned it to reach the correct alignment. All our links were 10 miles. One thing to remember is that alignment is NOT always symetrical. Just because one side is -42 does not mean both sides are in perfect alignment. You could be picking up signal on one end from a bounce, for example. Or picking up on a side lobe. But at the end of the day, we just kept trying both verticle and horizonal until we got it right. We had one time where we were 10 db off, where we aligned side A, and thought Side A was good because side A could easilly visually see Side B. We messed with Side B's alignment for hours with no success, assuming it was side B that was out of alignment because Side B was on a tower and being aligned by a climber that had never visually seen side A, and one of our techs was on side A. We went back and re-aligned side A, and we picked up another 5 db. It was side A that was out-of-alignment. We then went back to side B and re-aligned, and side B was now able to be re-aligned to get 5 db more better. We now had symetrical signal on both sides. My point here is that one side of a link can not be optimally aligned if the far side is out-of-alignment at teh time it is being aligned. Sometimes it takes going back and realigning both sides. If you are getting 10db off, my first thought is both sides are probably out-of alignment a slight bit. Again, the fact that you are getting -42 on one side could be fooling you to believe one side is aligned when it is not fully. Tom DeReggi RapidDSL & Wireless, Inc IntAirNet- Fixed Wireless Broadband ----- Original Message ----- From: "Gino Villarini" <g...@aeronetpr.com> To: <motor...@afmug.com>; "WISPA General List" <wireless@wispa.org> Sent: Thursday, December 24, 2009 12:26 PM Subject: [WISPA] 11 Ghz Trango Antenna Aligment > Hey Guys > > > > We are trying to fine tune a 8 mile 11 Ghz Link, expected rssi is -42, > > > > We got -43 in one end, -52 on the other end > > > > We have aligned both ends for hours to no avail. Bad radio on one end? > > > > To those with experience with the Trango Antennas on 11 ghz how many > turns on the fien tuning turnbuckle equals 1 deg? > > > > Antenan beamwidth is 3.6 deg so at 8 miles I have a .38 miles openning > > > > Gino A. Villarini > > g...@aeronetpr.com > > Aeronet Wireless Broadband Corp. > > 787.273.4143 > > > > > > -------------------------------------------------------------------------------- > 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/ > > > -- > Internal Virus Database is out-of-date. > Checked by AVG. > Version: 7.5.560 / Virus Database: 270.12.26/2116 - Release Date: > 5/15/2009 6:16 AM > > -------------------------------------------------------------------------------- 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/
