And the MW Filter notch for 928-930 is only $156 + shipping. >-----Original Message----- >From: Jack Unger [mailto:[EMAIL PROTECTED] >Sent: Tuesday, February 20, 2007 01:50 PM >To: 'WISPA General List' >Subject: Re: [WISPA] failing Canopy 900 > >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 > > >Brian Rohrbacher wrote: > >> Thanks, Jack. Would installing this one http://www.ubnt.com/cf.php4 >> be the correct move? Or is something else preferred. >> >> Brian >> >> Jack Unger wrote: >> >>> Brian, >>> >>> A -36 dBm signal probably won't destroy your receiver or permanently >>> desensitize it however your best bet is to get confirmation from a >>> Motorola rep. The signals you see at 928-930 MHz are from one or more >>> paging transmitters. These paging signals could easily desensitize >>> your AP receivers temporarily and cause a temporary inability to hear >>> incoming SM signals. >>> >>> Since you appear to be using antennas that are external to your APs, >>> you can insert a bandpass filter between each AP and its antenna. This >>> will attenuate the paging signals and allow the APs to receive SM's >>> from further away. If the paging transmitters ARE the cause of your >>> apparent AP receiver sensitivity deterioration, then the bandpass >>> filters should be helpful in reducing the frequency of occurance of >>> the problem. >>> >>> jack >>> >>> >>> Brian Rohrbacher wrote: >>> >>>> How would that help? One sector is still pointing at the >>>> interference.......Wouldn't that sector still make the radio fail, if >>>> the -36 signal is what is doing it? >>>> My question from the original post. Will that strong signal >>>> desensitize the radio into failure? If not, then I need to figure >>>> out what kills my radios. Why do they work fine for a month and then >>>> die? I replace just the radio and they are fine for a while. >>>> >>>> Brian >>>> >>>> >>>> Marlon K. Schafer (509) 982-2181 wrote: >>>> >>>>> If you are that close to a source of interference you need to ditch >>>>> the omnis and sectorize our tower. >>>>> >>>>> laters, >>>>> Marlon >>>>> (509) 982-2181 Equipment sales >>>>> (408) 907-6910 (Vonage) Consulting services >>>>> 42846865 (icq) And I run my own >>>>> wisp! >>>>> [EMAIL PROTECTED] >>>>> www.odessaoffice.com/wireless >>>>> www.odessaoffice.com/marlon/cam >>>>> >>>>> >>>>> >>>>> ----- Original Message ----- From: "Brian Rohrbacher" >>>>> <[EMAIL PROTECTED]> >>>>> To: "Conversations over a new WISP Trade Organization" >>>>> <wireless@wispa.org> >>>>> Sent: Tuesday, February 20, 2007 7:05 AM >>>>> Subject: [WISPA] failing Canopy 900 >>>>> >>>>> >>>>>> I keep losing canopy 900 APs. I used the spectrum analyzer >>>>>> yesterday and saw -36 signal on channels 928, 929, and 930. Will >>>>>> that strong signal desensitize the radio into failure? because for >>>>>> some reason SMs that used to be -65 are -80 (on both sides of the >>>>>> like) and 17 out of 33 associations have dropped off the AP. I've >>>>>> been fighting this for a year. I've installed my own grounding, a >>>>>> lighting dissipater, 6 new APs, 2 new omnis, and 3 new cables. I >>>>>> think I have ruled out anything that could be killing this AP >>>>>> except if something RF is killing it. Any input will help. >>>>>> >>>>>> Brian >>>>>> -- >>>>>> WISPA Wireless List: wireless@wispa.org >>>>>> >>>>>> 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: 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
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