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]> 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]> > 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? >> > > > >
