"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" <wireless@wispa.org>
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
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Jack Unger ([EMAIL PROTECTED]) - President, Ask-Wi.Com, Inc.
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