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Thread: HU Quality AM/FM RDS/RBDS Radio with Features

  1. #341
    Constant Bitrate csnowman00's Avatar
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    sweet, good job guys
    Current Progress:
    [▓▓▓▓▓▓▓---]80%
    Final Assembly

    Ramline P3 PC
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    Electrical Engineer / Mobile DJ

  2. #342
    Newbie
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    May 2004
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    racemier, rondo,

    I'm very happy to see the progress. Nice work. I also have an update too.

    I purchased the $500 design kit from Microtune. It has the TEF6892 (it has RDS demodulation and preprocessing, this means the decoded RDS data is placed on the I2C bus, so MUCH less code is required), a BTL audio amp, and two regulators. It's outputs are RDS MPX, FM MPX, AM AF, LEVEL (a DC level based on signal strength), antenna input, and 4 audio outputs from the TEF6892 as well as amplified audio outputs from the amp. I honestly love this damn thing. The software that came with it was the control software for the tuner and the TEF6892. Philips was kind enough to send me RDS reader and decoder software that has support for the TEF6892 and the SAA6588 as well. It reads the RDS data on the I2C bus and displays it. I'm including a pic of all the software running.

    The antenna I made is a 50 ohm RG-174 coax with SMB connector that plugs unto the SMB jack on the design kit, The end of it is connected to a dipole I made. I get decent reception, but I think the wallwort power supply I'm using adds noise that hinders reception.

    As for my own design, I'm going to build the hardware first and control everything with a PC for the time being. This way I'll be able to evaluate the MPX, RDS, and AM stereo decoders I want to use. I'm still quite undecided of what audio processor to use, but I'm leaning towards the TEF6892. If I use it I eliminate the need for an MPX and RDS decoder. With the TEF6892 I also get RDS and MPX gain which helps in reception a great deal. But there is no audio processor with an AM stereo decoder, unfortonately, so I'll have to use a seperate one, either based on the MC13022 or MC13028. I really did want to use the SAA6588 for RDS/RBDS decoding, but also wanted to build a SAA6581 PCB for RDS clock and data output so I could use better software than the Philips stuff. Another advantage to the TEF6892 is the fact I can use the frequency output from the tuner, and not depend on an RDS crystal. I'm just going to use everything and going to see what works best for me. Once all that is done, the hard part starts--the software. I can barely do 8051 ASM, but I think PIC ASM would be a bit easier. I still need to get a hold of the OLED display as well. I never had to sign an NDA for the design kit, so I think I can distribute the TEF and tuner software.

  3. #343
    Newbie
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    Here is the Philips RDSReader software. It'll work with the TEF6892, SAA6588, and other RDS/RBDS ICs that place the data on the I2C bus. It works great with the TEF6892 thats on my design kit PCB.

    If you have a TEF that outputs the RDS data as a data and clock line, use a MAX232 with the wiring diagram found in the help file of RDSDec software. RDSDec is the perfect software to use to read the RDS data.

  4. #344
    Raw Wave rando's Avatar
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    Yep, that dev kit is essentially the what Designs B and C are doing, minus the microcontroller and few goodies, plus and audio amp. It's a quick way to get a car ready radio but definitely a bit on the pricey side.

    Also, maybe I'm confused; as far as I can tell, the TEF689x does support AM stereo decoding.

    BTW, who's rondo?

  5. #345
    Low Bitrate ImInSanDiego's Avatar
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    Quote Originally Posted by Batmanatthenewb
    I sure can't wait to get one. Its been a year and a half with no radio.

    Batman
    Year and a half for me as well. Can't wait.

  6. #346
    Jesus Freak antimatter's Avatar
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    me to
    -Jesus- King of Kings Lord of Lords

  7. #347
    Raw Wave rando's Avatar
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    Not me, mine works great!

  8. #348
    FLAC
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    bah!
    2011 Nissan Frontier SL
    AMD X3 2.2 | M4-ATX | 16Gb SSD | 2GB DDR3-1333 | MSI GF615M-P33 MB
    OBDPROS USB | BU-303 GPS l LILLIPUT TS | Car2PC adapter | XM Direct | USB Dual band N with custom mag-mount antenna.

  9. #349
    FLAC
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    I haven't had a radio for so long that I removed the antenna off my car.

  10. #350
    Jesus Freak antimatter's Avatar
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    Quote Originally Posted by rando
    Not me, mine works great!
    -Jesus- King of Kings Lord of Lords

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