Are you sure?
Because the Atiny85 FW checks for
MIN_PULSELENGTH = ( shortest expected pulse - 10% ) / 10
MAX_PULSELENGTH = ( longest expected pulse + 10% ) / 10
and not for a freq.
I think you can use this.
A Saw filter when you really filter 433 with the Attiny85.
https://www.digikey.ca/product-detail/en...ND/3307725
Because the Atiny85 FW checks for
MIN_PULSELENGTH = ( shortest expected pulse - 10% ) / 10
MAX_PULSELENGTH = ( longest expected pulse + 10% ) / 10
and not for a freq.
I think you can use this.
A Saw filter when you really filter 433 with the Attiny85.
https://www.digikey.ca/product-detail/en...ND/3307725