You can find some good lessons learned from field deployments of 900 MHz PMP 450i in a high noise environment at http://community.cambiumnetworks.com/t5/PMP-Stories/Success-with-PMP450i-900MHz-in-a-high-noise-urban-environment/m-p/47004/highlight/true#M70
Ray Join the Conversation Cambium Networks Community Forum<http://community.cambiumnetworks.com/> From: [email protected] [mailto:[email protected]] On Behalf Of Kurt Fankhauser Sent: Tuesday, November 22, 2016 9:12 AM To: [email protected] Cc: [email protected] Subject: Re: [Cambium-users] [AFMUG] Dual-slant 900mhz omni (for PMP450) ordering group 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]<mailto:[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/<https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Falphaantennas.com%2Fproducts%2Fsmall-cells%2Faw3464%2F&data=01%7C01%7Cray.savich%40cambiumnetworks.com%7C34d24b96527a4fb9f6b308d412e9f47d%7C0e263e36340946228ac818d993e76eb6%7C1&sdata=bPWJPLqpTVNvzCQUW8L8d2bmaGEibHOZ1bbKgOvK7k0%3D&reserved=0> . 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.
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