What the heck...Ima try it....
On 3/12/2017 10:43 AM, Mathew Howard wrote:
Yeah, mixing H/V and slant works fine as long as one polarity isn't
screwed up... even then, it's not really a problem with mixing
antennas, it's just that slant works better.
The Cambium OEM is 65/90 - the spec sheet just says 65 degree, but if
you look at the pattern you can see it's at about -6 db at 90... at
120, it looks to be -9 db or so.
On Mar 11, 2017 4:53 PM, "George Skorup" <[email protected]
<mailto:[email protected]>> wrote:
We have slant SMs talking to H/V APs. They automagically figure it
out. Works fine. However, we're finding uplinks are kinda meh.
That's mostly due to V pol being nosier than H pol. That's where
slant at the AP helps to equalize the SNRs to allow a better
chance at running MIMO-B. But this is also 900, where reflections
and multipath can be horrendous. I'll say the 450i is by far the
best option if you have to use 900.
Also, I believe the Cambium OEM sector is a -3dB 90 / -6dB 120.
Unless I'm remembering wrong.
On 3/11/2017 2:59 PM, Jerry Head wrote:
I get the slant vs. h/v thing.
Interestingly enough my guys report that using the KP yagis with
the KP dual slant sector they can rotate the
yagis on the vertical axis to "fine tune" the signal...I.E.
sometimes 30d slant.
Maybe vertical is the wrong word here...
On 3/11/2017 10:32 AM, Mathew Howard wrote:
Well, it'll work better than the Rockets...
The obvious differences between the UBNT and Cambium sectors are
H/V polarity vs dual slant, and 120 degree vs 90 (at -6db, the
Cambium's are sold as 65 degree, but I believe they are 90 at
-6db). Not being slant shouldn't be a problem in most cases, and
the gain is about the same. My biggest concern would be the F/B
ratio, which doesn't seem to be listed on the spec sheet for the
UBNT antennas, but if you don't need to do frequency re-use,
that might not be too big of a deal.
We have one UBNT 900mhz sector, which we replaced with a Cambium
PMP450i (we actually added the PMP450i, the UBNT sector is still
in place, but currently powered off), and the signal levels
stayed pretty similar on the customers that we switched over for
the most part (most of the customers had Rockets with yagis). We
plan to add a second Canopy AP at some point, re-using the UBNT
sector, and re-aim both sectors to get more coverage, but
hopefully we'll be able to switch everything over to the UBNT
sector for a bit (with the 450i AP on it) while they're still
both aimed the same and get a little better comparison.
On Sat, Mar 11, 2017 at 8:34 AM, Jerry Head
<[email protected] <mailto:[email protected]>>
wrote:
We have some sites with UBNT 900 sectors.
I wonder how the PMP 450i 900 would work in place of the Rockets
on the UBNT antennas?
Any opinions?
