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A "low-pass" filter won't do anything to stop splattering onto adjacent channels; those are at basically the same frequency. What a LPF WILL do is attenuate harmonics, spurs and IMD products ABOVE its cutoff frequency. The nasty stuff BELOW the cutoff frequency won't be affected much.

For reducing adjacent-channel splattering, you need a BPF (band-pass filter). Problem is, you'd need a separate BPF for each channel, and that would get expensive.

[QUOTE="Beetle, post: 109224, member: 1066"] A "low-pass" filter won't do anything to stop splattering onto adjacent channels; those are at basically the same frequency. What a LPF WILL do is attenuate harmonics, spurs and IMD products ABOVE its cutoff frequency. The nasty stuff BELOW the cutoff frequency won't be affected much. For reducing adjacent-channel splattering, you need a BPF (band-pass filter). Problem is, you'd need a separate BPF for each channel, and that would get expensive. [/QUOTE]

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