Just using Omni whip antennas at some of these frequencies
at the 4 watt level will give you all kinds of power increases just by the
laws of physics. For instance when you go from 50 MHz to 450 MHz the free
space loss difference is 20 DB! That is a difference of 100 times! So if you
were to operate on say channel 2 using antennas without any gain, compared
to a UHF channel your power levels increased by 100 times, not to mention
the characteristics of those lower frequencies bending over obstacles
because propagation in lower frequencies follows the curvature of the earth
more and is not so much LOS. When you are talking about going much lower in
frequency the need for high gain directional antennas is greatly reduced.
Now the ability to make antennas invisible inside consumer level devices
will be very hard, WISPs are in the fixed wireless business so that
typically is not an issue. If you have up 9 channels available that is up to
54 MHz of new spectrum. For an industry crying for new spectrum without
having to pay for it, I think thats a great deal. I just looked at the area
around my house in the middle of NY and realized there are up to 22 channels
available. Thats 132 MHz of new spectrum.
As far as the antennas are concerned, yes they will be
larger and at the AP side directional antennas will need to be quite large
to establish directionality. Log periodic yagi antennas may be an option.
While they wont give you a lot of gain, they will give you a directional
pattern and be very wide banded. Use a combiner system and you could
possibly put multiple APs on different channels on the same antenna. WISPs
are going to have to rethink how they would construct their AP sites from
what they are accustomed to. On the CPE side Omni whips may be enough given
the characteristics of the lower frequencies. A ¼ wave Omni whip cut for 150
MHz range is only 19 inches long. The higher in frequency the shorter they
get.
A possible source of cheap, directional and varied antenna
designs for the CPE market would be actual TV antennas available NOW. If the
equipment manufacturers for whitespaces outdoor CPE are smart, they will
create radios that have a 75 Ohm impedance at the antenna port and take
advantage of the commercial TV antenna market rather than re-invent the
wheel. This will also help gain acceptance from the homeowners because they
would be looking at something they are already accustomed to.
Whitespaces is different but not impossible. Different is
change, human nature is resistant to change. If we can get our minds around
the idea of change and that it really isnt all that bad, we can all work
towards making the best of these changes and start working them to the WISP
advantage. The people who become the most successful are the ones who
embrace change and make good use of opportunities rather than resist. Make
lemonade J
Brian Webster
www.wirelessmapping.com
www.Broadband-Mapping.com
From: [email protected] [mailto:[email protected]] On
Behalf Of MDK
Sent: Saturday, September 25, 2010 3:41 AM
To: WISPA General List
Subject: Re: [WISPA] Today is a Momentous Day for our Industry - Sept. 23rd,
2010
Im not trying to throw cold water on you, but before anyone gets themselves
all excited, they better make use of the spectrumbridge tool and see if they
have ANY available channels. I'm relatively rural and I have ONLY 2-9.
All other frequencies are either adjacent to in use or in use. And, at the
low frequencies in use, I sort of doubt it will be well supported. Antenna
issues for 2-6 make one wonder if it'll be used much at all. That's
BELOW the FM band, and making use of antenna gain involves airplane size
antennas. I'm not saying it can't work, but there's huge issues, making
the range and practicality small.
++++++++++++++++++++++++++++++
Neofast, Inc, Making internet easy
541-969-8200 509-386-4589
++++++++++++++++++++++++++++++
From: Rick Harnish <mailto:[email protected]>
Sent: Thursday, September 23, 2010 3:07 PM
To: [email protected] ; 'WISPA General <mailto:[email protected]> List' ;
[email protected]
Subject: [WISPA] Today is a Momentous Day for our Industry - Sept. 23rd,
2010
Todays FCC decision to open up the TV Whitespaces for unlicensed operations
is a decision that validates the WISP industry, WISPA, its members and the
grassroots efforts we have achieved since our birth in 2004. I would like
to thank all of the WISP operators who have joined this movement and have
supported our efforts to improve our industrys stake in the Broadband
Service business landscape.
WISPA isnt a business; it is a well defined association of member
companies that have common interests and a drive to improve their
businesses. It is quite remarkable what we can all do when we combine our
forces. Todays M&O on the TV Whitespaces included WISPA 88 times! We
(WISPA) are now a household name with most of the lobbying groups (both
opposition and supporters) in the broadband industry, the FCC and many
legislators. We still need to work on the legislative lobbying effort and
that will take each of our members to write to their congressman and
senators, meet them personally and tell them our stories and successes.
Although it may be out of many operators comfort zone, it should be noted
that they (legislators) all get up and get dressed every morning just like
you and I. They are often former neighbors and have a passion to serve
their local service areas, just like we do. We need to befriend these
influential people and relay our passion to extend broadband ubiquitously.
We estimate there are 2000-3000 WISPs in the USA. Nearly 400 have joined
and support WISPA. We can further benefit our industry with greater
participation from those who continue to sit on the sidelines. We invite
those WISPs to join the rest of the operators by joining WISPA at
http://signup.wispa.org. By joining WISPA, you become a co-owner of WISPA
with all of the other members. Incidentally, I just received a call from
Francois Menard, a very astute operator in Canada, who will be joining WISPA
very soon. He thanked WISPA for our hard work and he would like to get a
similar organization started in Canada or get more Canadian WISP companies
to join WISPA. There is absolutely no reason why we cannot duplicate what
we have achieved to assist our neighbors to the north with greater
effectiveness.
The telecom world is heating up, debate is dynamic and everlasting! Our
work and lobbying continues or we will fade away through legislation without
representation. We MUST speak up to hold our ground and seek new fertile
ground. I work hard each day to stimulate the industry I so dearly love. I
invite you to join our efforts. The technical talk is fine and needed, but
without a playing field to place the infrastructure and achieve business
success, the technical talk is all a moot point.
Respectfully,
Rick Harnish
Executive Director
WISPA
260-307-4000 cell
866-317-2851 WISPA Office
Skype: rick.harnish.
[email protected]
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