1. New to Christmas lighting? Get started with the AusChristmasLighting 101 Manual:
    auschristmaslighting.com/wiki/AusChristmasLighting-101

Digital radio transmission (DAB+)

Discussion in 'The Development Lab' started by Jai Mcelroy, Aug 14, 2019 at 10:08 PM.

  1. Jai Mcelroy

    Jai Mcelroy new elf

    Joined:
    Jun 24, 2018
    Messages:
    7
    Likes Received:
    0
    Location:
    Chandlers Hill
    Hi i`m wanting to transmit both digital and analog signals for transmitting over radio, I am currently transmitting only analog signals but cars with digital radios are not able to pick this up any suggestions? .
     
  2. darylc

    darylc 404 darylc not found Global Moderator Generous Elf

    Joined:
    Dec 8, 2012
    Messages:
    617
    Likes Received:
    209
    get a digital radio transmitter?
     
  3. OP
    OP
    Jai Mcelroy

    Jai Mcelroy new elf

    Joined:
    Jun 24, 2018
    Messages:
    7
    Likes Received:
    0
    Location:
    Chandlers Hill
    Does this transmit both analog and digital? or do i need two transmitters if so any suggestions for a transmitter i had trouble finding an analog transmitter last year let alone a digital one.
     
  4. darylc

    darylc 404 darylc not found Global Moderator Generous Elf

    Joined:
    Dec 8, 2012
    Messages:
    617
    Likes Received:
    209
    I'd say you'd need 2 transmitters, one FM and one DAB+ I've never heard of anyone here doing DAB+ transmission.
     
  5. bpratt

    bpratt Apprentice Elf

    Joined:
    Mar 31, 2019
    Messages:
    93
    Likes Received:
    11
    Location:
    Jimboomba, Queensland
    I didn't realise that car radios with DAB didn't have an analog mode in them.
     
  6. OP
    OP
    Jai Mcelroy

    Jai Mcelroy new elf

    Joined:
    Jun 24, 2018
    Messages:
    7
    Likes Received:
    0
    Location:
    Chandlers Hill
    well newer cars like 2017+ I think use a scan like function to find stations on the cars I had people come around from my work, to look at my lights and they could not pick up the signal but any older generation car can pick up the signal for 200-250 meters, i made an assumption that the car radios were digital and thats why they couldn`t pick up the signal only just starting on this topic at uni digital electronics so im pretty inexperienced with it ....... but other then that my lights went really well last year.
     
    Last edited: Aug 15, 2019 at 12:43 AM
  7. David_AVD

    David_AVD Bite my shiny metal ass! Community Project Designer Generous Elf

    Joined:
    Jun 12, 2010
    Messages:
    3,986
    Likes Received:
    275
    Location:
    Victoria Point (Brisbane)
    Find Me On:
    As far as I know DAB+ transmitters are still a specialised, high priced item.
     
  8. Kitman

    Kitman Full Time Elf

    Joined:
    Oct 25, 2014
    Messages:
    388
    Likes Received:
    50
    Location:
    Munno Para
    Transmitting Digital radio is not going to be your friend. Digital radios introduce a slight delay, if you had a digital radio next to an analog radio you would noticeably hear the timing difference between the 2, this is further exacerbated by the fact that each digital radio will have or can have a different delay, as such your lovely display that you so meticulously got to line up with the audio will now be so far out of sync that it won't make much sense.

    As someone who has a newer car with digital radio in it, I can tell you that it also has analog radio you just have to select analog radio and not digital radio in order to find anything on analog.
     
  9. elnino

    elnino Full Time Elf

    Joined:
    Aug 1, 2014
    Messages:
    142
    Likes Received:
    0
    Also, you'll find that many radios these days will only tune to 'real' frequencies but your tx can do any frequency. Make sure you are using a valid frequency.
     
  10. David_AVD

    David_AVD Bite my shiny metal ass! Community Project Designer Generous Elf

    Joined:
    Jun 12, 2010
    Messages:
    3,986
    Likes Received:
    275
    Location:
    Victoria Point (Brisbane)
    Find Me On:
    +1 to that. Make sure you transmit on "odd" frequencies. eg 89.3 not 89.4 etc.
     
  11. Ash Brown

    Ash Brown New Elf

    Joined:
    Aug 5, 2019
    Messages:
    5
    Likes Received:
    0
    I think you are confusing the scan function on their car radio to being DAB, as far as I know all new cars with DAB still have normal analogue radio as well, I have it and don't use it as it is unreliable & Most radio stations are still analogue.
    the fact they are scanning and its not stopping on the desired channel is most likely due to a weak signal as the radio system needs a certain signal strength to stop at that channel.
    There is still always a way to manually tune or stop to the channel you have set, Usually a setting to turn scan off or sometimes you hold down the tune button, depending on the car make / Model, if they manually tune to your station you will find that you have no issues.
     
  12. BradsXmasLights

    BradsXmasLights WiFi Interactive

    Joined:
    Dec 23, 2010
    Messages:
    567
    Likes Received:
    40
    Location:
    Brisbane, Australia
    Find Me On:
    I agree with Kitman - there'll definitely be a transmission delay - which will make it an expensive waste of time.

    My car can does DAB and normal FM too.

    But explaining how to tune a car radio - let alone a new one.... good luck! :D
     
  13. bpratt

    bpratt Apprentice Elf

    Joined:
    Mar 31, 2019
    Messages:
    93
    Likes Received:
    11
    Location:
    Jimboomba, Queensland
    Will be a challenge for someone to 'go digital' with their lights broadcast.... they'd have to give their analog FM transmissions the boot, and change all timings on their sequences to line up.

    Problem is that I believe some DAB+ receivers don't decode the signal at the same rate/timeframe as other DAB+ receivers do, which means lots of issues. :(
     

Share This Page