Nothing against KP, I like their stuff. But AP mount, null fill, very
consistent pattern wins in my book.
I agree, the KP 900 sector has good gain for its size. F/B is not so
great, but it's better than the wind load you'd get from a cluster of 4'
Til-Tek's, which we've done and took down, because.. no. And no more
surfboards, LMG/Antel all the way. That's yet another antenna with null
fill and has an excellent pattern.
On 12/12/2014 4:12 PM, Ken Hohhof via Af wrote:
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 <mailto:[email protected]>
*Sent:* Friday, December 12, 2014 3:58 PM
*To:* [email protected] <mailto:[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]
<mailto:[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 <mailto:[email protected]>
*Sent:* Friday, December 12, 2014 3:06 PM
*To:* [email protected] <mailto:[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 <tel:937-552-2340>
Direct: 937-552-2343 <tel:937-552-2343>
1100 Wayne St
Suite 1337
Troy, OH 45373
On Dec 12, 2014 4:04 PM, "Matt via Af" <[email protected]
<mailto:[email protected]>> wrote:
Has anyone compared the KP 90 degree 3.6GHZ sector with the
Cambium
for use with 450?
