Gain only comes from narrowing coverage with antennas. If there are both 120* antennas you can't have HIGHER gain with GREATER coverage.... It takes half the coverage area go give you twice the power (3DB of gain).
http://www.odessaoffice.com/wireless/antenna/how_to_pick_the_right_antenna.htm laters, marlon ----- Original Message ----- From: "Michael Baird" <[email protected]> To: "WISPA General List" <[email protected]> Sent: Sunday, June 28, 2009 2:32 PM Subject: Re: [WISPA] Antenna Performance > Not ,the same downtilt angle, same percentage as the old one. The > previous antenna was a Tranzeo 16db w/6 degree vertical, the Teletronics > 19db has a 8 degree vertical actually larger VB then the 16db at 6. They > are both at .3 degrees downtilt. The only reason I mention the VSWR is > because the teletronics VSWR is 1.1:4, vs 1.5 on the Tranzeo. The > Teletronics is down about 6db on the CPE side for all the clients on the > test sector, on the AP side it's the same. I tested multiple tilt's as > well, between 0-1 degree was the best on the CPE side. > > Regards > Michael Baird >> First thing that comes to my mind reading your post is that you installed >> a >> higher gain antenna which means your vertical beam is going to be >> narrower >> (sometimes higher gain is not always better). Being that you installed >> the >> antenna with the same down tilt angle your missing the mark because you >> have >> a narrower vertical beam. >> >> As for the VSWR nothing really considered too low. If your VSWR is higher >> then 1.5:1 then you have a problem for sure. >> >> Personally never used or tested TT's 15-124 antenna but have sold a few >> of >> them with no complaints on it as far as I know. >> >> -----Original Message----- >> From: [email protected] [mailto:[email protected]] On >> Behalf Of Michael Baird >> Sent: Sunday, June 28, 2009 8:33 AM >> To: WISPA General List >> Subject: [WISPA] Antenna Performance >> >> I picked up a Teletronics 15-124 19db horizontal antenna for testing and >> deployed it in place of a Tranzeo 16db Horizontal (TilTek?), using same >> pigtail and radio. With the clients on this sector, the AP side is the >> same, but the CPE receive side seems to have suffered with this larger >> antenna. Nothing was changed other then the antenna, aimed to the exact >> same degree, tilted the same percentage of vertical tilt, and so forth. >> I'm thinking the antenna isn't very good, or it's VSWR is too low and >> I'm getting some power reflected from the antenna. Anybody have >> experience with this antenna, or these scenarios? >> >> I expected this bigger, more expensive antenna to gain all across the >> board. >> >> Regards >> Michael Baird >> >> >> ---------------------------------------------------------------------------- >> ---- >> WISPA Wants You! Join today! >> http://signup.wispa.org/ >> ---------------------------------------------------------------------------- >> ---- >> >> WISPA Wireless List: [email protected] >> >> 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: [email protected] >> >> 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: [email protected] > > 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: [email protected] Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
