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Looking for a Multiple FM frequency transmitter for simultaneous music streams

Discussion in 'General Electronics Discussion' started by andy taylor, Dec 29, 2016.

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  1. andy taylor

    andy taylor

    5
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    Dec 29, 2016
    Hi,

    I am looking to find a device that can transmit multiple simultaneous music streams each to a different FM frequency that can be selected. Each music stream would be from a separate device (smartphone/laptop/mp3) and uses the headphone jack to connect to the device. Range within 200 meters. FM frequencies should be able to be selected (ie to only broadcast on an empty frequency) manually. Battery operated great or mains not a problem either. 4-10 channels if possible.

    Thanks for any help you can provide.

    Andy
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    11,655
    2,696
    Nov 17, 2011
    I don't know a suitable multiple transmitter. I suggest you use several simple single transmitters as can be used to listen to music from your MP3 player on your car radio.

    Make sure you observe local regulations concerning the use of radio frequencies in the FM broadcast spectrum.
     
    davenn likes this.
  3. andy taylor

    andy taylor

    5
    1
    Dec 29, 2016
    Thank you, i have tried having multiple car transmitters and it works ok but each needs its own power source (cables cables and more cables) and the range is only around 30 meters diameter, i need something a little more powerful and as long i i keep it under the 150-200 meter range here i am ok legally but will check that out officially. Would be nice to have something more compact, i can probably make up a multiple stacked FM transmitter board but if i can buy something to test it out would be preferred.
     
  4. sundy

    sundy

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    Aug 5, 2016
  5. andy taylor

    andy taylor

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    Dec 29, 2016
    This looks like just the thing i am looking for, dad is an electronic engineer so he can help me put it together. Looks like tho they have discontinued selling this product know anything about that?
     
  6. sundy

    sundy

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    Aug 5, 2016
  7. andy taylor

    andy taylor

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    Dec 29, 2016
    Thank you, thank you. I think a set of 4 of these will do me just fine. do you know the effective range? from the map it looks like1km or so?
     
  8. sundy

    sundy

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    Aug 5, 2016
    Too many variables to say. If you on top of a hill with no obstacles to your receivers a 1km or more is probable. If you are down the hall behind a block wall with a metal fire door it might only be 50 feet.
     
  9. andy taylor

    andy taylor

    5
    1
    Dec 29, 2016
    perfect i will be using on a big beach/open park. I will get one and give it a test. Again thank you :)
     
    sundy likes this.
  10. GhostLoveScore

    GhostLoveScore

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    Nov 27, 2016
    I say be very careful. As a radio amateur I know how high fines for illegal use of RF spectrum are. There are extensive laws for hams and what we are allowed and what we aren't allowed to do. I am messing with TV transmitters too, but what I do is always limited to at most 30m range. Transmitting sound on commercial FM frequencies over 1km range - you could get in trouble.
     
    davenn likes this.
  11. davenn

    davenn Moderator

    13,866
    1,958
    Sep 5, 2009
    Agreed
    COMREG is the authority for licencing legalities in Ireland
    https://www.comreg.ie/industry/radio-spectrum/licensing/
    . I would be extremely surprised if your can transmit signals in the FM band over a 200m or so range
    you would interfere with every FM radio receiver in the area ...
    I see a lot of very upset people complaining to the authorities in your future

    here is a list of exempt transmitter/transmission types
    https://www.comreg.ie/industry/radio-spectrum/licence-exemptions/list-of-licence-exemptions/

    broadcasting .....
    https://www.comreg.ie/industry/radio-spectrum/licensing/search-licence-type/broadcasting-services/

    and also ... if you are broadcasting "commercial music" .... music produced by any band, group
    that you didn't produce, you will also need to be paying royalties for the use of that music


    Dave
     
    Last edited: Dec 31, 2016
  12. sundy

    sundy

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    Aug 5, 2016
    I have no knowledge of European regs concerning RF transmission. What I do is find an un-used frequency and transmit on that frequency.
     
  13. GhostLoveScore

    GhostLoveScore

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    Nov 27, 2016
    Laws are similar everywhere. What is the power of your transmitter? How big is its range?
     
  14. davenn

    davenn Moderator

    13,866
    1,958
    Sep 5, 2009
    that doesn't make it legal ;)
     
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