I see what you’re talking about. It’s not dramatic, but I would think the best thing would be for the two polarizations to have almost identical patterns.
Not sure what to make of the gain vs freq graph which shows more like 15 dBi rather than 16.5 dBi. I think we all suspect that with most antennas, the specs are more “typical” than guaranteed, except for certain high end brands. That might be the deciding difference, unless someone has actual side-by-side field results, I believe the Cambium antennas are per spec. Not saying the KPP ones aren’t. But like people have said about the 900 sectors, you probably lose a dB or two compared to MTI or Til-tek. That said, the last 900 sector I bought was a KPP, it is half the size of the other monsters. But in this case, the Cambium sector with the bracket to hold the 450 AP probably wins out in the mechanical department. From: Kade Sullivan via Af Sent: Friday, December 12, 2014 3:58 PM To: [email protected] Subject: Re: [AFMUG] 90 Degree 3.6GHZ Sector The -3 vs -6 is exactly what I was refering to. When you look closely at the antenna pattern of the KP antenna, it just looks like they pushed each polarity farther away from each other in relation to the cambium antenna. This makes the lobes come out a bit farther and spec out as -3 instead of -6. If you look at each polarity individually, they are more like the -6 cambium sector. This is why I feel like in the real world, there is no advantage. I am no RF engineer though, so this is just what I could determine by looking at the patterns overlapped. On Fri, Dec 12, 2014 at 3:53 PM, Ken Hohhof via Af <[email protected]> wrote: You’re talking about the “Gen II”, right? That’s the 450 compatible one. I have only compared spec sheets. Looks like 90 degrees is at 3 dB points, while Cambium is more like 5-6 dB. No null fill. 2 degrees downtilt. No bracket to hold AP papoose style. Otherwise similar specwise. KPP also lists a 120 degree sector, the spec sheet is a disaster though. Numbers say 2.4 GHz, pattern is ugly, F/B ratio is bad, not sure if it’s bad editing or what. The numbers and patterns on the 90 look good though, except for no null fill, and make sure tower guy knows there is already 2 degrees downtilt, it’s a pretty narrow vertical beam so you don’t want to double up on downtilt. I have only used the Cambium sector, other than the N connectors are in a mildly annoying location, I like them. Neither antenna is cheap. From: Josh Luthman via Af Sent: Friday, December 12, 2014 3:06 PM To: [email protected] Subject: Re: [AFMUG] 90 Degree 3.6GHZ Sector I expect it's like Mike Tyson vs an infant. Josh Luthman Office: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373 On Dec 12, 2014 4:04 PM, "Matt via Af" <[email protected]> wrote: Has anyone compared the KP 90 degree 3.6GHZ sector with the Cambium for use with 450?
