I’d recommend at least trying the 450i. If the dominant interference is Canopy
900, use the GPS sync and match timing parameters. I can’t guarantee you will
get an improvement over FSK, but I think it’s worth trying. I had a 900 FSK AP
with subs that wouldn’t even stay registered, I swapped it out for 450i and
after some tweaking to the timing parameters was able to get 4X in a 7 MHz
channel and the subs stay registered.
From: George Skorup
Sent: Saturday, January 16, 2016 8:35 PM
To: af@afmug.com
Subject: Re: [AFMUG] Runcom TVWS
I'm looking at it this way. We have a lot of 900 FSK and the noise floor is
already pretty bad. The power company will be rolling out smart grid soon.
Cambium showed some real-world results in a high noise floor environment (like
-50 across the band) and while the 450i worked, throughput was no better than
FSK. So the 900 450i would be a very big investment for no performance gain.
Now, take the Runcom TVWS, which is the only viable gear right now. If you have
two adjacent channels open and can run 10MHz channel bandwidth, you'll probably
see around 20Mbps of throughput per base station. That's 5 times better than
FSK or the 450i in a high noise environment.
On 1/16/2016 8:12 PM, David Milholen wrote:
TVWS has its place for now in low demand environments ie telemetry, utility
and industrial. As far as end user
I would be prone to make a showing in places where dial up or satellite is
the only option.
Plus with so many restrictions its about as good as 2.4 with no interference
as far as range.
Until restrictions on power and height are lifted and bit per hertz is
increased I am not impressed with the band yet.
On 1/16/2016 7:31 PM, George Skorup wrote:
There's a thread going on the WISP members list about this very topic. Are
you on that list? Someone said don't waste your time and money, but wouldn't
say why. So I don't have a clue, but I'd like to put up a trial site this
spring because 900 is shit.
On 1/16/2016 6:00 PM, Craig House wrote:
Anyone out there had experience with it. Our is supposed to be all on
site this week. So far I haven't heard the greatest things but I know that bad
experiences tend to make the rounds in the form of complaints more than the
good experiences do so I'm trying to be optimistic still.
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