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]
<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/
<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.
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