Tone spacing and frequency scaling error + only FT8 working on 2m/6m

[jrhilton]

I have managed to get FT8 on 2m/6m to work but I have to have FT8_TONE_SPACING as 62.5 instead of 625, and FT8_DEFAULT_FREQ set to 14417400UL if I want 144.174mhz as an example.

It seems the scaling in both is off for some reason. No issues using any other Si5351A examples I find on the internet, including GPS frequency corrected versions using 2.5mhz output etc.

Also all the other modes don't seem to work, I can see the signal looks ok on the waterfall on the receiver, but I suspect the timing or frequency spacing is not quite right and I assume it must be related to the scaling issue above.

I'm using an Arduino Uno, and the only modifications are setting the mode and having to change the scaling factor and frequency - has anyone seen this issue too or have any ideas for troubleshooting?