Center of the SSB filter is shifted abt 70 Hz to the higher frequency, but in practice it would have no effect. If I tried in the beginning of this attempt to order original 9 MHz 500Hz and 250 Hz filters, one of known european manufacturer asked 350,- Eur per piece plus VAT....My head turned twice 360 degrees around and I said "thanks". I am not willing to support the loan sharks. This HM solution will be usable, especially, when Si5351 will be in use as a programmable BFO generator. Complete solution will be described somwhere in next parts....
Remark: Stop band value of the filters will be better in the final board. And, when roofing filters will be added, results can markedly improve.
Now, I continue the experiment with QT crystals (frequency 8.996920 Hz, very good quality). I sugggested testing board for crystal parameters
measuring. When board arrives from OSH Park, I will continue with filters proposal... New filters will be proposed exactly to the 9 MHz.