Mark,
I'm going to reply but this will be my last reply on this subject. I
don't want to exceed my "5 posts per day" limit any more than necessary.
:)
Yes, I understand about receiver selectivity. I've also taught over 2000
WISP personnel about it since 2001. I also wrote a (vendor-neutral) book
about proper broadband wireless network design and deployment. The book
has a heavy emphasis on explaining how wireless works. One entire
chapter is devoted to evaluating and selecting wireless equipment.
I do think it's beyond the role and beyond the budget of the FCC to be
able to certify equipment as "good enough", better, best, etc.
It's the job of the intelligent WISP owner/operator to learn how
wireless propagation works and how wireless equipment works. Then the
WISP operator can make their own determination about what equipment is
best to achieve their particular wireless goals in their particular
wireless environment.
Have a good night,
jack
Mark Koskenmaki wrote:
Then you know and understand the value of selectivity and what clean
transmitters are. There's "good enough" to get certified, and then there's
"good" and "better" and "excellent" and I'd like to see us have the
information and be able to lean on the manufacturers to clean up their acts.
There is a wide gulf between "certifieable" and "very good". An aweful
lot of manufacturers are playing the "power" race, which I don't like, I
wish they were trying to complete on all the RF qualities of their
equipment.
----- Original Message -----
From: "Jack Unger" <[EMAIL PROTECTED]>
To: "WISPA General List" <wireless@wispa.org>
Sent: Sunday, April 29, 2007 11:14 PM
Subject: Re: [WISPA] was School WiFi , about technical values.
I am a ham and I have been for 48 years. I've also held an FCC
Commercial License for 28 years. Without my ham experience, I doubt that
I would have been able to transition into the license-free wireless
industry in 1993 - which was before any WISPs even existed. My years of
ham experience made the transition relatively easy. I recommend that all
WISP operators consider getting their ham licenses which, BTW no longer
require any Morse Code tests.
jack
Mark Koskenmaki wrote:
You a HAM operator, Jack?
----- Original Message -----
From: "Jack Unger" <[EMAIL PROTECTED]>
To: "WISPA General List" <wireless@wispa.org>
Sent: Sunday, April 29, 2007 10:52 PM
Subject: Re: [WISPA] was School WiFi , about technical values.
Mark,
Certification verifies that the signals conducted into the power line
and the signals radiated into the air from a wireless system are clean
and that they do not exceed the power limits. Minimizing self
interference is primarily a function of good network design techniques.
This is outside the scope of FCC certification because, even with
certified equipment, it is easy for an uninformed person to deploy a
network that interferes with itself and with other networks.
To motivate manufacturers, let them know you want to buy only certified
systems from them.
jack
Mark Koskenmaki wrote:
----- Original Message -----
From: "Jack Unger" <[EMAIL PROTECTED]>
To: "WISPA General List" <wireless@wispa.org>
Sent: Sunday, April 29, 2007 10:05 PM
Subject: Re: [WISPA] was School WiFi , about technical values.
See comment inline, near end of post.
Wrong. Certification DOES test for out of band emissions; it also
tests
for out of channel emissions. It does not test for receiver
selectivity
because that is not a characteristic that will mess up the band. Part
15
certification deals primarily with dirty transmitted signals, not
poor
receivers.
jack
Well, I should have been more clear. Yes, there are tests and
certain
limits. Just being "good enough" isn't what I was wanting. I'd like
the
best stuff, because doing so means you minimize self interference,
etc.
--
Jack Unger ([EMAIL PROTECTED]) - President, Ask-Wi.Com, Inc.
FCC License # PG-12-25133
Serving the Broadband Wireless Industry Since 1993
Author of the WISP Handbook - "Deploying License-Free Wireless WANs"
True Vendor-Neutral Wireless Consulting-Training-Troubleshooting
FCC Part 15 Certification Assistance for Wireless Service Providers
Phone (VoIP Over Broadband Wireless) 818-227-4220 www.ask-wi.com
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