Jack,
Is there a technical difference between a notch filter and a bandpass
filter?
Is it possible the 930 notch only attenuates 930, and does not help with the
other potential harmful interferers such as the upper 800s, and the higher
than 930 stuff?
I'm jsut trying to get an idea of whether a WISP really needs an assortment
of filters in their tool chest to try what helps best, in absense of a
spectrum analizer.
It also may matter depending on what unlicensed radio type.
For example the Ubiquiti 900 card has excellent filtering built in, for the
noise a bit farther away, but not good for the close in adjacent noise.
Maybe the inexpensive 930 notch filter is ideal for use with the Ubiquiti
900 card?
Up on a tower, the noise may not just be the close in paging.
Tom DeReggi
RapidDSL & Wireless, Inc
IntAirNet- Fixed Wireless Broadband
----- Original Message -----
From: "Jack Unger" <[EMAIL PROTECTED]>
To: "WISPA General List" <[email protected]>
Sent: Tuesday, February 20, 2007 4:20 PM
Subject: Re: [WISPA] failing Canopy 900
Because it's a "notch", it attenuates the paging frequencies while letting
the 902-928 band go through with little to no attenuation. You could use
it on any frequency within 902-928.
Brian Rohrbacher wrote:
yes, but I'm still unclear about what center frequency I could use with
it. Thw spec sheet didn't clear it up. I'll have to try to call them
back.
Brian
Jack Unger wrote:
Thank you, Brian. The price is certainly right on that filter.
Brian Rohrbacher wrote:
Sharing the info I am............
Hello, Brian
Thank you for your interest in Microwave Filter Company.
The filter that you inquired about is the:
Notch Filter
MFC P/N 15345
$164.00 unit cost plus shipping
Shipment 1 week after receipt of order
Attached is the specification drawing of the filter that you requested.
If you have any questions or concerns, please contact me direct.
Regards,
Bob Haytko
Customer Relations
Microwave Filter Co., Inc.
Tel: 315-438-4725 (direct)
Fax: 315-463-1467
Email: [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
Jack Unger wrote:
Brian,
Bandpass filters come in different band "widths". Some are full-band
filters that pass 902-928 MHz and some are single-channel filters that
are narrower and pass only one channel. The bandwidth of the two
Ubiquity filters are a little narrow to use across the entire band but
if you are using 912 or 917 as center frequencies, they should work
well. If you're using a lower center frequency, you'll need a filter
that has a bit wider bandwidth but which still attenuates the paging
frequencies a lot. The availability of good whole-band bandpass
filters seems to have deteriorated a bit in the last year. There are
more filters available but they seem to have poorer characteristics
and sometimes higher prices. I just looked at RFLinx and Hyperlinktech
and I am not happy with their current offerings. I did discover a
notch filter that is tuned to attenuate the paging frequencies while
passing the 902-928 frequencies. I don't know the pricing but if it's
priced reasonably then it looks like your best bet. Here's the link:
http://www.microwavefilter.com/2ghzRelocation.htm#ism
It's the filter at the bottom of the page. If you call them to get a
spec sheet and to check pricing, please share that info.
Thanks,
jack
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Jack Unger ([EMAIL PROTECTED]) - President, Ask-Wi.Com, Inc.
Serving the License-Free Wireless Industry Since 1993
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