With the exception of a diplexer on a full duplex microwave radio, Part 15 filters are usually bandpass and are not high-low because there is only one channel.
And the cost is reasonable. The last one we purchased was only about $200. RF Linx. But I agree with antennas, F/B ratio, higher gain to reduce lobes, shadow the antenna if possible, etc. Of course if any of these are omni's most bets are off. -B- Mike wrote: > 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/ > > > -------------------------------------------------------------------------------- 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/
