When did 450 start working with mixing Slant and Linear? Whats your definition of working? Last time I tried running a 2.4ghz 450 AP with a V/H Omni and the slant SM's they all would operate in Mimo-A mode (instead of Mimo-B) which basically resulted in throughput being cut in half. Or are you saying that it works because the product does run in Mimo-A mode when it cant distinguish the chains? I guess for me I would want to run in Mimo-B mode to get maximum throughput.
On Tue, Nov 22, 2016 at 7:41 PM, Ken Hohhof <[email protected]> wrote: > I would be very surprised if you couldn’t use the dual slant yagi at the > SM and a V/H sector or (shudder) omni at the AP. You could open a ticket > with Support or post on the Cambium community. But if 2.4 and 3.65 can do > it, why would 900 lack this capability? Why would a Dalmatian not have > spots? > > > > > > *From:* Af [mailto:[email protected]] *On Behalf Of *George Skorup > *Sent:* Tuesday, November 22, 2016 5:19 PM > *To:* [email protected] > *Subject:* Re: [AFMUG] Dual-slant 900mhz omni (for PMP450) ordering group > > > > It's not as simple as taking the slant adapter off of the Cambium yagi. > The adapter is threaded. You'll need slightly longer bolts and nuts to > convert it to H/V. > > Ideally, I'd like to leave them as slant and get away with a H/V omni > during site conversions. Then there's no going back to the customers after > swapping to Cambium OEM slant sectors. > > What we could do right now if we really wanted to, is use an Antel h-pol > and a separate v-pol omni like L-com/Hyperlink or something like that. I > know Ben Royer has done that. I think it was an MTI diving board though, > and whatever v-pol omni. > > On 11/22/2016 4:56 PM, Mathew Howard wrote: > > I'm pretty sure the 900mhz 450i can do the phase thing... the 3.65ghz > PMP450 definitely can (the high gain integrated thing is H/V, but all the > other 3.65ghz is slant, so it does work), so it'd seem pretty odd if these > couldn't. I did do some testing with mixing H/V and slant antennas, and it > seemed to work fine, but I didn't really do enough testing to know for > sure. It looks like you can change the Cambium yagis to H/V pretty easily > (theres a metal piece the holds the mount to the antenna at a 45 degree > angle, that looks to be removable... haven't actually tried it though). > > Tower loading is definitely a problem with these things... so far all of > our deployments have only been one or two sectors, because we usually don't > need nlos coverage in all directions anyway, but I certainly wouldn't want > four of them on most of our towers. Itelite makes a little (closer to the > size of a normal 2.4ghz sector) 11dbi dual polarity H/V sector that could > somewhat help with that, if they work half way decently... they're not > exactly anywhere near the same quality as the Cambium sectors, and I'm > assuming they don't have good enough F/B ratio to do frequency re-use, but > they are nice and small and I'm hoping they'll be usable for some stuff. We > have one of them up, but I haven't had time to do anything with it yet, so > I don't know how well it's going to work. > > > > On Tue, Nov 22, 2016 at 1:45 PM, George Skorup <[email protected]> wrote: > > The scenario I have at many 900 sites is >15-20 customers using 4x90 ABAB > on FSK. There is no other option. 900 is the only thing that works. And I'm > already using 16MHz. The top of the band is hosed with paging. I might be > able to sneak a 5MHz channel in somewhere, but it will depend on the site. > > The next problem is tower loading. I already have four sectors. Adding > another four of the Cambium OEM is unpossible. So if I can have an omni to > get the site converted to 450i, take the FSK sectors down and put 450i > sectors in their place and then take the omni down. > > That Alpha is hugemongous, but is dual slant. The KP will be H/V. So how > would the SM handle being in a mixed H/V and slant environment? Can the 900 > 450i do the phase thing? > > The final problem which could make this a big waste of money is the smart > grid rollout that we will see in the next year or two. If I get FSK speeds > out of the 450i after they turn it up, that's pretty much suicide. > > I would club baby seals for some TVWS gear that works. > > On 11/22/2016 9:12 AM, Kurt Fankhauser wrote: > > You are wasting you time with omni's on 900mhz. So your sacrificing a lot > of gain to get 360 degree coverage which in turn will result in higher > overall noise floor and lower signal when this 450 product really starts to > shine you need 25db+ SNR at the client side to get the higher modulation > connections. So even if you got the Omni you'd going to be lucky to get > 8-10db SNR to the client which means your only going to be running at 2x > speed and getting 10mbps download which will probably be intermittent. I > had a lot of omnis on FSK 900 and I can tell you that after having used the > cambium slant sector on 450 I am a firm believer in sectors only for 900 > from here on out. I have connections that are 3-4 miles out running 10mhz > channels and getting 40mbps down/10mbps up. You will never get that with an > Omni unless you have LOS and if you have LOS then why aren't you using > another frequency band? > > > > On Tue, Nov 22, 2016 at 2:03 AM, Colin Stanners <[email protected]> > wrote: > > I've been looking for dual-slant 900mhz omni options that would allow > lower-cost PMP450 900mhz deployment on middle-of-the-woods towers where > there are only a small number of customers (and low noise). I know that > "omnis suck compared to sectors", but having nothing at all sucks more. > Due to the difficulty of designing dual-slant antennas and the small > market, options are very few. > > Commscope has the CH360QS, only 5dbi gain at ~900mhz... and it's a > cellular base station omni with all the fancy doodads: 1800-2200Mhz band > that WISPs can't use, internal GPS antenna, internal diplexer, > remote-controlled signal tilt on the upper band, etc. At $3500 per antenna > I hope that it makes your breakfast too. > > Alpha has the best design that I found at present, the AW3464. ~7dbi gain > http://alphaantennas.com/products/small-cells/aw3464/ . It's ~$1200 USD > which is still inexpensive compared to any other NLOS options. > > But currently those antennas cannot be bought - I spoke with Crossover > Distribution and Alpha, they haven't received enough POs to make a > production run, need 50 orders at a bare minimum. So if anyone else is > really interested in one or more of these antennas, ready to buy for sure > if they are available, e-mail me "If available, I will buy x number of the > Alpha AW3464 at $1200/USD each from Crossover." and I'll make a list, once > it hits 50+ antennas I'll speak with Crossover and see if it can happen. > > > > > > > > >
