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Thread: FM/DAB digital radio - THAT WORKS!!

  1. #141
    Low Bitrate war085's Avatar
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    Guys, anyone tried the HP Tuner or the Hauppauge ? Those can be easly connected to the car antenna .. just need to confirm the compatability with RR and CF

  2. #142
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    war085,
    Both of these units are digital TV tuners, not digital RADIO tuners.
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  3. #143
    lez
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    Quote Originally Posted by RevheadKev View Post
    war085,
    Both of these units are digital TV tuners, not digital RADIO tuners.

    but radio is transmitted in the same tuning range etc, just carries no video or advertisements.
    Lez, more widely known as flez1966

  4. #144
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    DAB/FM Combiner

    Hi

    I have been looking for a solution to combine FM & DAB signals to pass into the venice 5/7. Looks like a masthead triplexer would do the job:

    http://www.tvaerials.com/product.aspx?productid=2173

    Would need to be removed from the case, The TV input can either be ignored or terminated at 75R I guess. There appears to be no such thing as a DAB/FM diplexer, they are all for TV/FM+DAB

    Losses look 'reasonable', and the module can be removed from its waterproof case & shoved in the same box as your DAB module.

    Main issue is the F-Type connectors. Re-terminating the DAB and FM down-leads with F-Types should not be a huge problem, but making up an F-Type <--> SMB cable might be more of an issue due to the totally different cable sizes.

    I'll see how an F-Type fits my downleads tonight.

    Nigel

  5. #145
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    Quote Originally Posted by lez View Post
    but radio is transmitted in the same tuning range etc, just carries no video or advertisements.
    OK lez, so does that mean potentially we do not need any DAB/DAB+ tuner but instead we can just get one of these digital TV tuners and listen to DAB/DAB+ broadcasts ?
    I did not think so because of the decoding required to convert the signal.
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  6. #146
    lez
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    Quote Originally Posted by RevheadKev View Post
    OK lez, so does that mean potentially we do not need any DAB/DAB+ tuner but instead we can just get one of these digital TV tuners and listen to DAB/DAB+ broadcasts ?
    I did not think so because of the decoding required to convert the signal.

    Does not deserve an explained response, as i never stated it recieves dab, just pointed out they do recieve radio, something you were obv not aware of, or ignored, or were just plain wrong about....
    Lez, more widely known as flez1966

  7. #147
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    DVB-T Tuners

    Hi

    These digital-TV (DVB-T) USB tuners are not going to cut it in an automotive environment. They would, perhaps be a nice addition to DAB, but not an alternative.

    DVB-T in the UK goes out on 6 muxes. The frequencies of these muxes is different depending on the transmitter you are using. When you drive out of range of one Tx you would have to re-tune manually. This is generally a lengthly process.

    In addition to the above in anything but a strong reception area, a directional (Yagi) aerial is required. I used to use DVB-T in a motorhome, but the frequent reception issues when outside area's of large population density meant that I switched to satellite. In a car, you'll frequently be 'between towns'.

    The radio channels on DVB-T appear to be national channels only - for instance, my local station 'forth one' is not on there.

    I also wonder how well these would work on the move re doppler shift (for passenger entertainment and radio only of course!). Unlike your mobile phone which counters the effects of doppler shift by frequency and/or time-slot hopping, DVB-T has no built in mechanism.

    A centrafuse module for DVB-T would be rather nice though as it would be neat to just put the box on while killing time waiting for someone/something!

    To do it properly would require a tuner capable of working in diversity mode: http://www.ebuyer.com/product/121759 these use two antenna both of which are connected to two tuners. The stream from the 2 tuners is then combined in software so that one can hopefully add the bits of the stream that the other does not have. In a car, this could be realised with 2 roof-top aerials in different positions. Saw an amplified DVB-T car aerial a while back, cant find it now. Seem to remember it being 150quid! Maybe these are an alternative: http://cgi.ebay.co.uk/Antenna-Digita...b50ea5ff46619a

    Nigel

  8. #148
    Low Bitrate war085's Avatar
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    Quote Originally Posted by RevheadKev View Post
    war085,
    Both of these units are digital TV tuners, not digital RADIO tuners.
    I know, but both have FM Tuners as well ...

  9. #149
    Low Bitrate war085's Avatar
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    Quote Originally Posted by lez View Post
    but radio is transmitted in the same tuning range etc, just carries no video or advertisements.
    Exactley ! so i that case, normal analogue FM can be used and easly connected to car antenna .. but I'm not sure about the CF or RR integration ..

  10. #150
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    lez & war085,

    Please stop trying to hijack this thread talking about DVB-T tuners and FM.
    This thread is about FM/DAB/DAB+ radio reception, particularly DAB+.
    You can start reading from the front of the thread to refresh your memory.
    If you have nothing constructive to add in relation to DAB+ reception then don't.
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