Maybe he's the one guy with no noise in 900mhz. We don't know that from
back here.
You could use a cheaper V+H antenna on the AP as long as you use V+H
antennas on the CPE.
You could also build an array of four sector antennas with a four-way
splitter. You lose at least 6db on the splitter, but if you're looking
at 5dbi and 7dbi omnis then it's probably in the same ballpark. The
good thing is you could set a different tilt angle in different
directions and if load required it in the future you could go to two
2-way splitters and two APs.
------ Original Message ------
From: "Kurt Fankhauser" <[email protected]>
To: [email protected]
Cc: [email protected]
Sent: 11/22/2016 10:12:13 AM
Subject: Re: [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]>
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.
