A friend of mine told me that he had (at a previous time) a connector for his BECKER Car-audio that at which can connect KENWOOD CD-changer. I tried to find the controlling protocol of BECKER CD-changer, but useless. Anyone could help me with some information about this protocol?

So I just found out that there is a whole RDS board in VW GAMMA-3, also there is ready to use RDS PCBs at conrad.de (.com). Just if you could find any RDS board I'll tell you how to connect it to a radio and PC .
 I have VW GAMMA-3 here, but unfortunately you are very far awa from here

Thanks for the information...

Can you guys light me up a little, I do not understand what you call a DAB unit. One of my customers was looking for a DAB, but he didn't know what exactly was DAB.

There are a lot of people that want me build an Universal CD-changer controller (a board that could make possible connection between any CD-changer and any Car-Radio that has a controller for CD-changer). I have expirience with PIC controllers, so it won't be that hard, except I do not have enough info for the interfaces that are used in some radios...
Can somebody help me a bit, if I build it it will be opened source and I'll give it free!

You can find SAA6579T in VW Gamma-3 (made by Philips)...

Well, I gave you some links, I think that the last one contained a schematic digram...you connect the RDS decoder to the MPX signal (this is the output of the FM demodulator, which means between the Tuner and the Stereo-decoder).

Yes, lots of new radios are this way...Try some older radios (like VW or Philips), but the best solution is to buy a RDS IC.

You cannot find RDS IC because it's sowtware implemented in the microprocessor of the radio.

Get rid of that M7400RDS, I couldn't find any info about how it works... Try TDA7330 or SAA6579T...It's much easier!

But I'm still willin to help you building it...ask if you dont understand something

Now I see it's useless to build such a device (for me ), it's already done by lots of people...
See this:
http://users.pandora.be/hollie/picmicro/rds.htm

Check out these links:

http://www.esslinger.de/download/index.htm
http://home.pi.be/~wijnherm/deco.html
http://perso.wanadoo.fr/ybnet/cartedecod_uk_gif.html

Well, they all use TDA7330 (which is a RDS decoder) but I am trying to understand what interface is used for decoding the two output lines of the decoder (RCL and RDATA), maybe its I2C...

It strongly depends on your radio.


I'm working on the problem now, I am trying to develop an RDS decoder...then I'll try to implement a serial link for comunication with the PC.

Well, I haven't done anything like this before but sure it won't be very hard to do... What do you mean 'expensive "kits"'? I mean to do this with a microcontroller PIC which just transfrers the information from a radio (with RDS) and transforms it into a asyncronos serial interface. The only problem is that I do not write software for PC yet, only firmware for microcontrollers... If you have any idea, write it down...I'll try to think of something