What happens when you get interference on that channel? Are you going to
climb the tower and remove the filter so you can change channels on the
radio. Just a thought! You would really be restricting your options should
"in channel" interference become an issue.
Rick Harnish
-----Original Message-----
From: karlnet-admin@WISPNotes.com [mailto:karlnet-admin@WISPNotes.com]On
Behalf Of karlnet-request@WISPNotes.com
Sent: Friday, June 28, 2002 11:05 AM
To: karlnet@WISPNotes.com
Subject: Karlnet digest, Vol 1 #102 - 1 msg
Send Karlnet mailing list submissions to
karlnet@WISPNotes.com
To subscribe or unsubscribe via the World Wide Web, visit
http://lists.wispnotes.com/mailman/listinfo/karlnet
or, via email, send a message with subject or body 'help' to
karlnet-request@WISPNotes.com
You can reach the person managing the list at
karlnet-admin@WISPNotes.com
When replying, please edit your Subject line so it is more specific
than "Re: Contents of Karlnet digest..."
Today's Topics:
1. RE: Bandpass filters (Travis Brown)
--__--__--
Message: 1
From: "Travis Brown" <travis@netwaveva.com>
To: <karlnet@WISPNotes.com>
Subject: RE: [Karlnet] Bandpass filters
Date: Thu, 27 Jun 2002 16:54:48 -0400
Organization: NetWave Internet
Reply-To: karlnet@WISPNotes.com
This is a multi-part message in MIME format.
------=_NextPart_000_0023_01C21DFB.6B0BFDE0
Content-Type: text/plain;
charset="us-ascii"
Content-Transfer-Encoding: 7bit
Yes.
The filter can be set to, for instance, 2.427GHz (channel 4) with a 22
MHz bandwidth (+/- 11 MHz from the center frequency), which is the
optimum bandwidth for an 802.11b channel. All radio signals above or
below that bandwidth will be filtered out before they hit the radio.
Looks like about $325 for one unit. We'll see... gonna order one if no
one offers any advice against it. :-)
Travis
-----Original Message-----
From: karlnet-admin@WISPNotes.com [mailto:karlnet-admin@WISPNotes.com]
On Behalf Of Melvin C. Etheridge
Sent: Thursday, June 27, 2002 4:41 PM
To: karlnet@WISPNotes.com
Subject: Re: [Karlnet] Bandpass filters
So could you use this to filter all but just one freq set in the 2.4 ISM
band? Say channel 1 or 6 or 11?
Mel
----- Original Message -----
From: Travis <mailto:travis@netwaveva.com> Brown
To: karlnet@WISPNotes.com
Sent: Thursday, June 27, 2002 3:09 PM
Subject: RE: [Karlnet] Bandpass filters
Mel,
One typical customer off this base as a s/n of -64dbm/-79dbm.
On our "quiet" bases, we see customers at similar distances and CPE
setups having something like -58dbm/-95dbm. Clean, quiet, and FAST. :-)
I'm looking at a company now that has a 2.4GHz wide bandpass filter that
they adjust to a specific center freq with a 22-25 MHz notch -- I'm
gonna stick with the 22 MHz bandwidth simply because of the nastiness of
the noise we see.
Travis
-----Original Message-----
From: karlnet-admin@WISPNotes.com [mailto:karlnet-admin@WISPNotes.com]
On Behalf Of Melvin C. Etheridge
Sent: Thursday, June 27, 2002 2:42 PM
To: karlnet@WISPNotes.com
Subject: Re: [Karlnet] Bandpass filters
Travis,
What are your noise levels in dbm?
Mel
----- Original Message -----
From: Charles Chia Sheng <mailto:cwu@cwlab.net> Wu
To: karlnet@WISPNotes.com
Sent: Thursday, June 27, 2002 2:34 PM
Subject: RE: [Karlnet] Bandpass filters
it all depends on notch size - there's a company in Ohio that makes a
nice amp w/ a 22 MHz notch - think they're called Rflinx or something
-Charles
-----Original Message-----
From: karlnet-admin@WISPNotes.com [mailto:karlnet-admin@WISPNotes.com]On
Behalf Of Travis Brown
Sent: Thursday, June 27, 2002 8:41 AM
To: karlnet@WISPNotes.com
Subject: [Karlnet] Bandpass filters
Anyone using bandpass filters on your base gear due to dirty tower sites
and such? We have a base (AP-1000) that shows very high noise at the
tower site, and I'm hoping a very narrow bandpass filter will help.
Any thoughts? I would appreciate some feedback from those of you that
have experience with these filters.
Thanks!
Travis
--
==============================
M. Travis Brown, MCSE
Network Systems Engineer
NetWave Internet
434.386.0656
travis@netwaveva.com
<http://www.netwaveinternet.com> http://www.netwaveinternet.com
==============================
------=_NextPart_000_0023_01C21DFB.6B0BFDE0
Content-Type: text/html;
charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META HTTP-EQUIV=3D"Content-Type" CONTENT=3D"text/html; =
charset=3Dus-ascii">
<TITLE>Message</TITLE>
<META content=3D"MSHTML 6.00.2716.2200" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><SPAN class=3D507054920-27062002><FONT face=3DArial color=3D#0000ff =
size=3D2>Yes.</FONT></SPAN></DIV>
<DIV><SPAN class=3D507054920-27062002><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D507054920-27062002><FONT face=3DArial color=3D#0000ff =
size=3D2>The=20
filter can be set to, for instance, 2.427GHz (channel 4) with a 22 MHz =
bandwidth=20
(+/- 11 MHz from the center frequency), which is the optimum bandwidth =
for an=20
802.11b channel. All radio signals above or below that bandwidth will be =
filtered out before they hit the radio.</FONT></SPAN></DIV>
<DIV><SPAN class=3D507054920-27062002><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D507054920-27062002><FONT face=3DArial color=3D#0000ff =
size=3D2>Looks=20
like about $325 for one unit. We'll see... gonna order one if no one =
offers any=20
advice against it. :-)</FONT></SPAN></DIV>
<DIV><SPAN class=3D507054920-27062002><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D507054920-27062002><FONT face=3DArial color=3D#0000ff =
size=3D2>Travis</FONT></SPAN></DIV>
<BLOCKQUOTE dir=3Dltr style=3D"MARGIN-RIGHT: 0px">
<DIV></DIV>
<DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr =
align=3Dleft><FONT=20
face=3DTahoma size=3D2>-----Original Message-----<BR><B>From:</B>=20
karlnet-admin@WISPNotes.com [mailto:karlnet-admin@WISPNotes.com] <B>On =
Behalf=20
Of </B>Melvin C. Etheridge<BR><B>Sent:</B> Thursday, June 27, 2002 =
4:41=20
PM<BR><B>To:</B> karlnet@WISPNotes.com<BR><B>Subject:</B> Re: =
[Karlnet]=20
Bandpass filters<BR><BR></FONT></DIV>
<DIV><FONT face=3DArial size=3D2>So could you use this to filter all =
but just one=20
freq set in the 2.4 ISM band? Say channel 1 or 6 or =
11?</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>Mel</FONT></DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3Dtravis@netwaveva.com =
href=3D"mailto:travis@netwaveva.com";>Travis=20
Brown</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dkarlnet@WISPNotes.com=20
href=3D"mailto:karlnet@WISPNotes.com";>karlnet@WISPNotes.com</A> =
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Thursday, June 27, 2002 =
3:09=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> RE: [Karlnet] =
Bandpass=20
filters</DIV>
<DIV><BR></DIV>
<DIV><SPAN class=3D172044818-27062002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2>Mel,</FONT></SPAN></DIV>
<DIV><SPAN class=3D172044818-27062002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D172044818-27062002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2>One typical customer off this base as a s/n=20
of -64dbm/</FONT></SPAN><SPAN class=3D172044818-27062002><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>-79dbm.</FONT></SPAN></DIV>
<DIV><SPAN class=3D172044818-27062002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D172044818-27062002><FONT face=3DArial =
color=3D#0000ff size=3D2>On=20
our "quiet" bases, we see customers at similar distances and CPE =
setups=20
having something like </FONT></SPAN><SPAN =
class=3D172044818-27062002><FONT=20
face=3DArial color=3D#0000ff size=3D2>-58dbm/-95dbm. Clean, quiet, =
and FAST.=20
:-)</FONT></SPAN></DIV>
<DIV><SPAN class=3D172044818-27062002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D172044818-27062002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2>I'm looking at a company now that has a 2.4GHz wide =
bandpass filter=20
that they adjust to a specific center freq with a 22-25 MHz notch -- =
I'm=20
gonna stick with the 22 MHz bandwidth simply because of the =
nastiness of the=20
noise we see.</FONT></SPAN></DIV>
<DIV><SPAN class=3D172044818-27062002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D172044818-27062002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2>Travis</FONT></SPAN></DIV>
<BLOCKQUOTE dir=3Dltr style=3D"MARGIN-RIGHT: 0px">
<DIV></DIV>
<DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr =
align=3Dleft><FONT=20
face=3DTahoma size=3D2>-----Original Message-----<BR><B>From:</B>=20
karlnet-admin@WISPNotes.com [mailto:karlnet-admin@WISPNotes.com] =
<B>On=20
Behalf Of </B>Melvin C. Etheridge<BR><B>Sent:</B> Thursday, June =
27, 2002=20
2:42 PM<BR><B>To:</B> karlnet@WISPNotes.com<BR><B>Subject:</B> Re: =
[Karlnet] Bandpass filters<BR><BR></FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Travis,</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>What are your noise levels in=20
dbm?</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>Mel</FONT></DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- =
</DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3Dcwu@cwlab.net href=3D"mailto:cwu@cwlab.net";>Charles =
Chia Sheng=20
Wu</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dkarlnet@WISPNotes.com=20
href=3D"mailto:karlnet@WISPNotes.com";>karlnet@WISPNotes.com</A> =
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Thursday, June 27, =
2002 2:34=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> RE: [Karlnet] =
Bandpass=20
filters</DIV>
<DIV><BR></DIV>
<DIV><SPAN class=3D779062818-27062002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2>it all depends on notch size - there's a company in =
Ohio that=20
makes a nice amp w/ a 22 MHz notch - think they're called Rflinx =
or=20
something</FONT></SPAN></DIV>
<DIV><SPAN class=3D779062818-27062002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D779062818-27062002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2>-Charles</FONT></SPAN></DIV>
<BLOCKQUOTE dir=3Dltr style=3D"MARGIN-RIGHT: 0px">
<DIV class=3DOutlookMessageHeader dir=3Dltr align=3Dleft><FONT =
face=3DTahoma=20
size=3D2>-----Original Message-----<BR><B>From:</B> <A=20
=
href=3D"mailto:karlnet-admin@WISPNotes.com";>karlnet-admin@WISPNotes.com</=
A>=20
[<A=20
=
href=3D"mailto:karlnet-admin@WISPNotes.com";>mailto:karlnet-admin@WISPNote=
s.com</A>]<B>On=20
Behalf Of </B>Travis Brown<BR><B>Sent:</B> Thursday, June 27, =
2002=20
8:41 AM<BR><B>To:</B> karlnet@WISPNotes.com<BR><B>Subject:</B> =
[Karlnet] Bandpass filters<BR><BR></FONT></DIV><!-- Converted =
from text/rtf format -->
<P><FONT face=3DArial size=3D2>Anyone using bandpass filters =
on your base=20
gear due to dirty tower sites and such? We have a base =
(AP-1000) that=20
shows very high noise at the tower site, and I'm hoping a very =
narrow=20
bandpass filter will help…</FONT></P>
<P><FONT face=3DArial size=3D2>Any thoughts? I would =
appreciate some=20
feedback from those of you that have experience with these=20
filters.</FONT> </P>
<P><FONT face=3DArial size=3D2>Thanks!</FONT> </P>
<P><FONT face=3DArial size=3D2>Travis</FONT> <BR><FONT =
face=3DTahoma=20
size=3D2>--</FONT> <BR><FONT face=3DTahoma=20
=
size=3D2>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D</FONT> <BR><FONT face=3DTahoma=20
color=3D#800000 size=3D2> <B> M. Travis Brown, =
MCSE</B></FONT><B></B>=20
<BR><FONT face=3DTahoma size=3D2> </FONT><FONT =
face=3DTahoma=20
color=3D#0000ff size=3D2> Network Systems Engineer</FONT> =
<BR><FONT=20
face=3DTahoma color=3D#0000ff size=3D2> NetWave =
Internet</FONT>=20
<BR><FONT face=3DTahoma color=3D#0000ff size=3D2> =
434.386.0656</FONT>=20
<BR><FONT face=3DTahoma color=3D#0000ff =
size=3D2> </FONT><FONT=20
face=3DArial color=3D#000000 size=3D2></FONT> <FONT =
face=3DTahoma=20
color=3D#0000ff size=3D2>travis@netwaveva.com</FONT> <BR><FONT =
face=3DTahoma=20
color=3D#0000ff size=3D2> </FONT><FONT face=3DArial =
color=3D#000000=20
size=3D2></FONT> <A=20
href=3D"http://www.netwaveinternet.com";><U></U><U><FONT =
face=3DTahoma=20
color=3D#0000ff =
size=3D2>http://www.netwaveinternet.com</FONT></U></A>=20
<BR><FONT face=3DTahoma =
size=3D2>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D</FONT>=20
=
</P></BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE></BO=
DY></HTML>
------=_NextPart_000_0023_01C21DFB.6B0BFDE0--
--__--__--
_______________________________________________
Karlnet mailing list
Karlnet@WISPNotes.com
http://lists.wispnotes.com/mailman/listinfo/karlnet
End of Karlnet Digest
|