HIgh performance AM/FM RDS software-defined radio signal processing tuner with NXP TEF668X and I2C Arduino Controller for XDR/NXP/TEF GTK user interface ( for old "historical" versions visit rdi.boards.net ! )
Antenna Switch option:
Ant A = Normal
Ant B = iMS enabled ( FM multipath suppression when the receiver is in a moving vehicle )
Ant C = EQ enabled ( FM channel equalizer for improved field performance )
Ant D = Both enabled
Audio output level is fixed -> 0dB or +3dB or variable in new " Beta pack "
For AM the following four bandwidth settings are supported:
3 / 4 / 6 / 8 kHz
For FM the following sixteen bandwidth settings are supported:
56 / 64 / 72 / 84 / 97 / 114 / 133 / 151 / 168 / 184 / 200 / 217 / 236 / 254 / 287 / 311 kHz
On modified NXP/TEF-GTK user interfaces the bandwidth parameter values now fits well.
In some third party XDR-GTK altered interface versions available on internet the word "Ant" has been replaced by others such also the funny "DX" which, apart from the word itself on a button, doesn't bring a real "DX", a plus of performance on weak fringe RF signals, being only just linked to some variations of tone corrections through DSP that modify the audio signal after demodulation ... just to impress the fools :) Likewise the option to adjust the gain in the GTK interface also for the "IF" , which on TEF668X is missing being only available for the "RF", not also for the "IF"! The command is the same for both value options, but the naives don't know that! :)
Great special thanks to Konrad Kosmatka, author of the original & brilliant version for Sony XDR-F1HD
and also to ( in alphabetical order ):
- ace919
- Brian Beezley
- dxhdtv
- eggplant886
- fmdxbp
- Jan Kolar
- Marcin Woloszczuk
- Mihai Popa https://github.com/stailus/tef6686_rds
- makserge https://github.com/makserge/tef6686_radio
- Nicu Florica http://nicuflorica.blogspot.com/2020/02/radio-cu-tef6686.html
- ODJeetje
- Olivier Guillaume
- Przemyslaw Korpas
- Sjef Verhoeven https://github.com/PE5PVB
- VoXiTPro https://github.com/voxit1512/Tef6686
and many other enthusiasts ...
Tested on Arduino Nano V3.0 at 5V
Feel free to add your own contribution to this nice project !