The 900mhz 450i works about as good as you could hope for.
Regardless of product I'd plan capacity around 5mhz or 7mhz channels.
You can theoretically do a 4 sector cluster with 10mhz channels and back
to back re-use if there's nobody else on the band. Or you can do a
single sector at 20mhz with the same stipulation. With 5mhz or 7mhz
channels you some agility to pick the cleanest part of the band.
We do some real damage with 900mhz, but it comes with a price. I think
Ken hit on most of the points already, but you'll spend more time
finding the right spot for an antenna and your service calls will be
more frequent.
On 9/9/2020 12:19 PM, David Coudron wrote:
Hi folks,
Thanks for the feedback, this was what we were looking for. It looks
like the TVWS is a non-starter, but we should take another look at
900 MHz. We are fortunate in that the areas are typically grouped
very narrowly in one direction. We figured we could cover the area
with a 10 degree sector if we could find one that narrow. We’ll see
what we can find for 900 MHz equipment out there.
Thanks,
David Coudron
*From:* AF <af-boun...@af.afmug.com> *On Behalf Of * Ken Hohhof
*Sent:* Wednesday, September 9, 2020 10:43 AM
*To:* 'AnimalFarm Microwave Users Group' <af@af.afmug.com>
*Subject:* Re: [AFMUG] TV White Space
Oops, 26 MHz, not 28. 902-928.
*From:* AF <af-boun...@af.afmug.com <mailto:af-boun...@af.afmug.com>>
*On Behalf Of *Ken Hohhof
*Sent:* Wednesday, September 9, 2020 9:50 AM
*To:* 'AnimalFarm Microwave Users Group' <af@af.afmug.com
<mailto:af@af.afmug.com>>
*Subject:* Re: [AFMUG] TV White Space
I keep hearing about Microsoft and its Airband initiative. I have no
idea why Microsoft thinks that TVWS has merit or what technology they
bring to the party, but I guess you could investigate it. I have to
agree with the others, it was never very attractive, and gets less so
as time passes and people want to do video streaming and Zoom meetings
and download 100 GB games over the Internet, and as other technologies
advance.
I would also ask, what if Starlink actually works, and is months away
from general availability. It may not be a threat to WISPs in general
(or maybe it is), but it would seem to solve this particular problem.
And what if Starlink succeeds in getting RDOF or CAF subsidy money?
Wouldn’t you just be lighting hundred dollar bills on fire?
As far as 900 MHz, we stopped using it. The reason wasn’t so much RTK
(a lot of which is moving to 450 MHz anyway), but smartgrid and
smartmeters. If the power company or other utilities put in 900 MHz
smartmeters, kiss 900 MHz goodbye for broadband. The other problem
was that it was always more art than science, sometimes it wouldn’t
work and the reasons wouldn’t be clear. It’s touch to plan or
troubleshoot when, by definition, you don’t have clear line of sight.
There’s also the issue of other WISPs in 900 MHz, but it sounds like
you wouldn’t have this issue.
But the Cambium 450 900 MHz stuff does work, and even though you only
have 28 MHz total to work with, you can use a wide enough channel to
get decent speeds. We still have one AP in service with a handful of
customers on it. I would steer clear of 900 MHz omni antennas
though. If you can’t justify sectors, just don’t do it.
*From:* AF <af-boun...@af.afmug.com <mailto:af-boun...@af.afmug.com>>
*On Behalf Of *Bill Prince
*Sent:* Wednesday, September 9, 2020 9:28 AM
*To:* af@af.afmug.com <mailto:af@af.afmug.com>
*Subject:* Re: [AFMUG] TV White Space
If they are in a cluster, this could possibly be a viable option.
bp
<part15sbs{at}gmail{dot}com>
On 9/9/2020 7:25 AM, ch...@wbmfg.com <mailto:ch...@wbmfg.com> wrote:
Get them to contribute to the cost of a tower in their area.
*From:*David Coudron
*Sent:*Wednesday, September 9, 2020 7:52 AM
*To:*AnimalFarm Microwave Users Group
*Subject:*[AFMUG] TV White Space
We have a couple of areas in our network that remain problem
coverage areas. The typical scenario is a handful of customers
that are 5-10 miles from a decent tower structure, but really want
service. We have usually either passed on providing coverage, or
messed around with relaying from other customers or some other
messy scenario. We are looking for a workable non-los solution
for these few spots. We don’t need to get dozens of folks on a
tower, and a higher than normal cost is OK, but it needs to be
stable enough it is better than the relays and other messy
solutions we have come up with. We keep looking at 900 MHz, but
it looks like Cambium is the only one left in this game, and we
are pretty worried about noise as we are in the middle of farm
country and the RTK stuff is pretty prevalent. Has anyone had
enough experience with TV white space to develop an opinion on its
ability to be used in this situation? There only seems to be two
vendors in this space, Redline and Carlson, but maybe there are
others we are missing. We are looking for a solution that would
cover customers 5-7 miles in non-los situations with rate plans of
20-25 Mbps. Is this possible?
Regards,
David Coudron
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