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HB VHF low-pass filter
Hi gang,
And old chum of mine suffers badly from pager interference when he's trying to listen on the 2m band. The interference is strong to him (S9+) and takes out all his reception, despite the fact that it's quite a way up-band at 153Mhz. I've been looking into designing a filter for him to cut off by 153Mhz to better than -20db but it turns out to be rather more tricky than I'd imagined. Even with a seven element butterworth configuration, the difference between the 146Mhz (wanted) and the 153Mhz (unwanted is an insignificant 6db or so. I'm just not getting enough roll-off and need something much sharper. Worse still, the roll-off I'm seeing is on a computer simulation of the filter with ideal components and would no doubt be even worse with real-world Ls and Cs. Any suggestions as to how to tackle the problem, guys? Thanks, P. |
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