Jack,
That all sounds good, and it brings up a good point, that we are just as
probable to be the culprit, not just the other guy.
Besides, their gear costs more, right :-)
However, what specific gear do you have experience with, on this issue, to
support your comment?
I'm not sure that I am knowledgable enough on the topic, to know for sure
which side is the flaw, how would we tell?
I use Trango 900. Trango's have a built-in specrum site survey tool, that
also scans a bit lower and higher than the ISM edge. My comment was based
on the fact that, when I do the site survey, I see signals in the neg 20-30
range, spanning from significantly above 930 down to mid portion of ISM
channel 4 (924 or so).
Have you verified the accuracy of the Trango tool, and how it reacts to this
situation?
Tom DeReggi
RapidDSL & Wireless, Inc
IntAirNet- Fixed Wireless Broadband
----- Original Message -----
From: "Jack Unger" <[EMAIL PROTECTED]>
To: "WISPA General List" <[email protected]>
Sent: Friday, October 27, 2006 1:07 PM
Subject: Re: [WISPA] Sprint / Nextel to use 900mz for iDen
"Bleed over" implies that the paging system is transmitting a signal that
is too wide. This is typically NOT the case. Our rather inexpensive WISP
AP receivers do not have adequate selectivity to reject strong nearby
signals. In other words, it's our equipment problem not their equipment
problem.
Also, WISP subscriber sites, unless located right under a paging/cellular
tower aren't close enough to be overloaded by paging/cellular so they
would not need the bandpass filter. Only our APs which are located near
paging/cellular towers should need the bandpass filters.
jack
Larry Yunker wrote:
While filters can help, the problem that I see is that filters are: 1)
expensive and 2) bulky. Last time I checked, a cavity filter for the
902-928 range was roughly $300-$400. I don't see it being practical to
install one of these at every customer site!
Cavity filters are fine for your broadcast sites, but that is of little
help when the 900Mhz paging systems bleed over so much that they "deafen"
the subscriber radios.
- Larry
----- Original Message ----- From: "Mike Cowan"
<[EMAIL PROTECTED]>
To: "WISPA General List" <[email protected]>
Sent: Thursday, October 26, 2006 7:32 PM
Subject: Re: [WISPA] Sprint / Nextel to use 900mz for iDen
Filters fix this problem quite handily. We recommend one on every
system needed or not. I don't see an issue here.
Mike
At 07:07 PM 10/26/2006, you wrote:
ISM 902-928.
Exact band and Power limit is relevant. Currently, the top 25% of ISM
900 bandwidth (channel 4) is unusable, in MANY areas, due to blead over
from 930 Licensed high power gear (500W). If the same thing were to
occur at the lower portion of 900 ISM bandwdith, it could kill Channel
1 also, horribly effecting WISPs using unlicenced. They also may be
requesting to use higher power on the actual ISM bands, argueing Public
Safety is more important than unlicensed use. Iftheir request is
granted, specifics should be lsited on how they are going to prevent
interference with existing unlicensed band users. Remember that the
goal may not only be to use the spectrum. They have benefit in killing
off all the 900Mhz WISPs, that could compete with Sprint/Nextel Next
generation WiMax type Licensed 700M-900M solutions.
Tom DeReggi
RapidDSL & Wireless, Inc
IntAirNet- Fixed Wireless Broadband
Mike Cowan
Wireless Connections
A Division of ACC
166 Milan Ave
Norwalk, OH 44857
419-660-6100
[EMAIL PROTECTED]
www.wirelessconnections.net
--
WISPA Wireless List: [email protected]
Subscribe/Unsubscribe:
http://lists.wispa.org/mailman/listinfo/wireless
Archives: http://lists.wispa.org/pipermail/wireless/
--
Jack Unger ([EMAIL PROTECTED]) - President, Ask-Wi.Com, Inc.
Serving the License-Free Wireless Industry Since 1993
Author of the WISP Handbook - "Deploying License-Free Wireless WANs"
True Vendor-Neutral WISP Consulting-Training-Troubleshooting
Newsletters Downloadable from http://ask-wi.com/newsletters.html
Phone (VoIP Over Broadband Wireless) 818-227-4220 www.ask-wi.com
--
WISPA Wireless List: [email protected]
Subscribe/Unsubscribe:
http://lists.wispa.org/mailman/listinfo/wireless
Archives: http://lists.wispa.org/pipermail/wireless/
--
WISPA Wireless List: [email protected]
Subscribe/Unsubscribe:
http://lists.wispa.org/mailman/listinfo/wireless
Archives: http://lists.wispa.org/pipermail/wireless/
