el_supremo
Well-known member
If I understand you correctly, that is not going to work. I haven't used an Si5351 but I don't see how you use a frequency from the Teensy to "tune" the Si5351. The Si5351 is a clock generator, not a frequency synthesizer.
You would be a lot better off implementing the encoding of the WSPR digital signal directly in the Teensy and then use that to drive a synthesizer chip.
I have generated JT65 signals with a Teensy++2 and a DDS-60 which uses an AD9851 synthesizer to transmit on 40 metres. I've also implemented FT4 audio encoding in a Teensy. Neither of those is a trivial thing to do but they are a whole lot easier than trying to make the Teensy discriminate between four tones which are separated by 1.4648 Hz and then somehow use that to drive a synthesizer.
Pete
You would be a lot better off implementing the encoding of the WSPR digital signal directly in the Teensy and then use that to drive a synthesizer chip.
I have generated JT65 signals with a Teensy++2 and a DDS-60 which uses an AD9851 synthesizer to transmit on 40 metres. I've also implemented FT4 audio encoding in a Teensy. Neither of those is a trivial thing to do but they are a whole lot easier than trying to make the Teensy discriminate between four tones which are separated by 1.4648 Hz and then somehow use that to drive a synthesizer.
Pete