I'd hate to step in any of that chicken crap here, but here goes. Cavities are usually in pairs, one tuned as a low pass and the other as a high pass. Cavities have quite a lot of insertion loss which will adversely affect your receive. Besides, they are expensive. If the noise was out of band, I'd recommend a low/high pass filter. Since it is in band, the best solution is to change your antennas if possible. Higher gain will have a tighter lobe and be less susceptible to interference. Change the polarity from vertical to horizontal or vice versa. Try to get some physical separation. I have managed to build mesh screens between the feed point on an antenna and another intentional radiator.
Best Wishes, Mike -----Original Message----- From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of Rogelio Sent: Monday, February 22, 2010 10:59 AM To: Bob Moldashel Cc: WISPA General List Subject: Re: [WISPA] suggestions on 2.4 GHz cavity filters? On Mon, Feb 22, 2010 at 8:57 AM, Bob Moldashel <lakel...@gbcx.net> wrote: > Are you sure you are seeing interference from cell systems and not from a > 2.4 Ghz backhaul for T1's at this or an adjacent site or something else? I > have never seen any 2.4 Ghz interference from any cell site equipment. Not > saying it can't happen just nothing I have ever heard of and we deal with > alot of that. "cell" as in a 2.4 GHz access radios covering a cell zone, not "cell" as in a phone cellular side. Basically, there are nine 2.4 GHz radios VERY close together, and performance is horrible (as you might imagine). I'm looking to try to make chicken salad out of chicken crap here. Someone suggested using cavity filters, so I'm looking into that (something I haven't used before). ---------------------------------------------------------------------------- ---- WISPA Wants You! Join today! http://signup.wispa.org/ ---------------------------------------------------------------------------- ---- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
