Yep, the integrated SM was H pol, which was part of the reason I went with horizontal for all of ours... and pretty much everything else that I've seen on 900mhz is V pol. I think it does make sense to go with slant for a 900mhz MIMO system to equalize the two paths.
On Wed, Oct 14, 2015 at 11:49 AM, George Skorup <[email protected]> wrote: > We're all H pol on our 900. Wasn't the old integrated SM was H pol as > well? Nearly all of the SCADA stuff out there is V pol. > > Slant gets you 3dB from H or V polarized systems. That's not a whole lot > of rejection. Like I said before, slant should get you better equalization > on the two paths so that it's not constantly running MIMO-A. But if it's so > noisy that you get maybe 10dB SNR, OK, so that'll be 1X MIMO-B, basically > not any better than FSK. > > > On 10/14/2015 11:24 AM, Daniel White wrote: > > I’m sure Matt will post in detail their reasoning for dual-slant next > week, but to sum up it was to get rejection from V-Pol and H-Pol signals > since the band is probably 100% linear polarized. > > > > I was shocked to hear Matt tell me though that many FSK customers are > using Vertical Polarity. I thought everyone did Horizontal, but maybe that > was just the way my WISP did it. > > > > Thank you, > > > > Daniel White > > <[email protected]>[email protected] > > Cell: +1 (303) 746-3590 > > Skype: danieldwhite > Social: LinkedIn <http://www.linkedin.com/in/danielwhite84>: Twitter > <https://twitter.com/DanielWhite84> > > > > *From:* Af [mailto:[email protected] <[email protected]>] *On > Behalf Of *George Skorup > *Sent:* Tuesday, October 13, 2015 3:49 PM > *To:* [email protected] > *Subject:* Re: [AFMUG] PMP 450i 900 MHz SM > > > > I would rather have the style we're used to: MCX to N-male pigtails coming > out of the bottom of the case. However, if you saw their dual-slant yagi > which has two RP-SMA connectors on it and a provision for mounting the SM > to the back of it, I can see why they're coming out of the top. The folded > dipoles do not have a radome. They will ice up and be worthless. Again, I > would much rather have an integrated panel. > > Their choice to do dual-slant.. we'll see how that goes. Makes all > existing antennas obsolete. I'm a little disappointed since it'll be 10x as > hard to convert a 4x90 FSK site. > > The -6dB 65 degree sectors drive me nuts. There's 26MHz to play with and > you can count on the top being trashed, then cordless phones and baby > monitors all throughout. There's no way in hell we could ever use six > sectors at a site. 90 degree sectors allows you to move around in the band > a little bit. So I hope they come up with some 90's. > > On 10/13/2015 5:24 PM, Brian Sullivan wrote: > > Is the design of the module final? > I'd rather see integrated cables or those pesky RF connectors underneath a > cover to avoid water. > Will Cambium be including RF cables with each SM? > > Also, the specs say 100M throughput in a 20MHz channel. What is the > throughput running in 1x or 2x? > > > 450 + ePMP love child. > > > > > > ------------------------------ > [image: Avast logo] <https://www.avast.com/antivirus> > > This email has been checked for viruses by Avast antivirus software. > www.avast.com <https://www.avast.com/antivirus> > > >
