John
You aren't clear in this message which spurs you are trying to solve, nor where you are putting this new filter?
If this is an added 45 MHz filter, adjacent to the mix to and from RF, then its objective is to reducing non harmonic mixing spurs typically found on 15, 12, and 10 meters. A common problem with v3 and v4, maybe less so on v5. Note this mixing only happens on ssb. In the last dB or to audio drive is a big deal. If my rig measured say 41 dB down at full output, note if I ran digital at less output I would likely be okay. For voice one might debate the last dB since our voices don't stay at peak amplitude.
Curt
