The engineer I spoke w/ at MW Filter claims they achieve a very 'steep' skirt at 928 with the notch filter and, therefore, eliminate the paging interference and still allow the use of the 920-928 spectrum. I think we would not know until its implemented in the field, on the tower, I am going to use 920-928, 60 miles north of a paging system located in Defiance, Ohio. I have not seen the problems Brian has at 915 MHz Center freq on a Canopy w/ PacWireless 9db Hpol Omni, atop a 300' tower. If I try the MW Filter device I will report my experience to the more knowledgeable among us on the WISPA list. Such as Mssrs DeReggi & Unger. And, of course Mr. Rohrbacher. Ron Wallace Hahnron, Inc. 220 S. Jackson Dt. Addison, MI 49220
Phone: (517)547-8410 Mobile: (517)605-4542 e-mail: [EMAIL PROTECTED] [EMAIL PROTECTED] >-----Original Message----- >From: Tom DeReggi [mailto:[EMAIL PROTECTED] >Sent: Tuesday, February 20, 2007 06:16 PM >To: 'WISPA General List' >Subject: Re: [WISPA] failing Canopy 900 > >RFlinx's arguement was that a bandpass filter to allow the use of the top >channel closest to 930, was pointless because the paging gear would kill it >anyway. >So they decided on a design that would sacrifice the top channel in favor of >a filter that would not degrade the receive strength of the desired signal, >and maximize the attenuation of the undesired interference. In theory, I >have a lot of respect for their approach. > >However, I sure like the $164 price of the filter that you found. The >question is whether the sacrificed anything in the design, or if they are >jsut willing to sell it cheaper. For example, as 3 pole design is cheaper >but less capable than a 4,5,8 pole design. > > >Tom DeReggi >RapidDSL & Wireless, Inc >IntAirNet- Fixed Wireless Broadband > > >----- Original Message ----- >From: "Jack Unger" <[EMAIL PROTECTED]> >To: "WISPA General List" <wireless@wispa.org> >Sent: Tuesday, February 20, 2007 4:15 PM >Subject: Re: [WISPA] failing Canopy 900 > > >> 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 >>> >>> >>> ------------------------------------------------------------------------ >>> >>> No virus found in this incoming message. >>> Checked by AVG Free Edition. >>> Version: 7.5.441 / Virus Database: 268.18.3/693 - Release Date: 2/19/2007 >>> 5:01 PM >>> >>> >> >> -- >> 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: wireless@wispa.org >> >> Subscribe/Unsubscribe: >> http://lists.wispa.org/mailman/listinfo/wireless >> >> Archives: http://lists.wispa.org/pipermail/wireless/ > >-- >WISPA Wireless List: wireless@wispa.org > >Subscribe/Unsubscribe: >http://lists.wispa.org/mailman/listinfo/wireless > >Archives: http://lists.wispa.org/pipermail/wireless/ > -- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
