Hi Hans, can you please consider this feature:
Just one request.
Can you make RDS frequency adjustable?
Like Airomate software can adjust it?
And play RDS only on one channel as option?
Idea of this is that you can get RDS from *any* sound card this way.
It's dirty and bad way, but it's possible. And great for experimenting with a Pi3 device.
How would you know that your frequency is set correctly? Both the pilot and RDS would need to move assuming that you want this to compensate for bad sound cards where the sample rate is too far off.
And what's the purpose of RDS on only one channel??
Well, it displays prerecorded RDS correctly even from mp3 file played from the crappiest mp3 player for 10 dollars with a primitive "car fm transmitter".
When it's played like that (19 khz on one channel no matter left or right) harmonics go all the way up to 38 and 57 khz where actual RDS is and it can be read in any receiver.
And it works. Even with most primitive devices.
So even an old Android phone can play this prerecorded mp3 file with RDS at 19 khz on one channel and play audio file at the same time, if audio levels are set correctly.
Or maybe an old netbook can run Airomate to generate the RDS on 19 khz and play the audio at the same time.