HIgh performance AM/FM RDS software-defined radio signal processing tuner with TEF6686HN/V102 and I2C Arduino Controller for XDR/NXP/TEF GTK user interface

( for old "historical" versions visit rdi.boards.net ! )

* by default audio output level is fixed -> 0dB or +3dB

* On genuine XDR-GTK interface the de-emphasis switch is acting now this way:

50uS => NORMAL ( 50 uS );

75uS => FLAT ( 0 uS );

0uS => MPX out mode ( DAC_Left : FM MPX (DARC) signal / DAC_Right : mono audio );

* XDR-GTK 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

* 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.

Other bandwidth parameter values are rounded to the nearest supported bandwidth in XDR-GTK genuine user interface but in the TEF-GTK modified user interface the bandwidth parameter values fits well.

In some third party XDR-GTK altered versions available on internet the word "Ant" has been replaced by others such as the funny "DX", which, apart from the word itself on a button, doesn't bring a real plus of performance on weak fringe RF signals, being only just to impress the fools :)

Great special thanks to Konrad Kosmatka, author of the original & brilliant version for Sony XDR-F1HD

https://fmdx.pl/xdr-i2c/

https://fmdx.pl/xdr-gtk/

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
• 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 !