I'm looking at high gain antenna for frequency reuse and not further
penetration.
-----
Mike Hammett
Intelligent Computing Solutions
http://www.ics-il.com
On 9/25/2010 8:22 AM, Brian Webster wrote:
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, WISP's 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 that's 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. That's 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 won't 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 AP's on different channels on the
same antenna. WISP's 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 ΒΌ 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 isn't 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 <http://www.wirelessmapping.com>
www.Broadband-Mapping.com
*From:* wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org]
*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
I'm 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:rharn...@wispa.org>
*Sent:* Thursday, September 23, 2010 3:07 PM
*To:* memb...@wispa.org <mailto:memb...@wispa.org> ; 'WISPA General
List' <mailto:wireless@wispa.org> ; motor...@afmug.com
<mailto:motor...@afmug.com>
*Subject:* [WISPA] Today is a Momentous Day for our Industry - Sept.
23rd, 2010
Today's FCC decision to open up the TV Whitespaces for unlicensed
operations is a decision that validates the WISP industry, WISPA, it's
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
industry's stake in the Broadband Service business landscape.
WISPA isn't 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. Today's 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 operator's
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.
rharn...@wispa.org
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