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Minimum distance between two aerials

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  • 17-09-2018 8:16am
    #1
    Irish Stones
    Registered Users Posts: 2,307 ✭✭✭


    Hi all,
    There's an automated gate with its own aerial and receiver. I'm going to add a receiver for a second automated gate and would like to use the same gatepost for placing its own aerial.
    The first aerial is for 300 MHz, the second aerial will be for 433 MHz.
    Is there a minimum distance to be observed between the two aerials?
    Thanks!


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    #2
    The Ritz
    Moderators, Technology & Internet Moderators, RicherSounds.ie Moderator Posts: 2,505 Mod ✭✭✭✭The Ritz


    Mod Comment

    Moved here from Home Entertainment DIY, hopefully someone here will be able to assist.


    Cheers,

    Ritz


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    #3
    humaxf1
    Registered Users Posts: 865 ✭✭✭humaxf1


    I've heard 1/4 wavelength distance based on the lowest frequency...

    1/4 WL at 300MHz is 250mm (10 inches)


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    #4
    Irish Stones
    Registered Users Posts: 2,307 ✭✭✭Irish Stones


    Thanks humaxf1,
    This is what I thought, but your post gave me a good feedback.


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    #5
    martinedwards
    Registered Users Posts: 2,043 ✭✭✭martinedwards


    if they're RECEIVERS then it should make very little difference at all.

    Transmitters, a different story, but as far apart as practical


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    #6
    Irish Stones
    Registered Users Posts: 2,307 ✭✭✭Irish Stones


    martinedwards wrote: »
    if they're RECEIVERS then it should make very little difference at all.

    Transmitters, a different story, but as far apart as practical
    What I know is that even two TV aerials must observe a distance when fitted on the roof.
    For instance, coupling two TV aerials to enhance their gain requires that they are one dipole size apart.


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    #7
    martinedwards
    Registered Users Posts: 2,043 ✭✭✭martinedwards


    Irish Stones wrote: »
    What I know is that even two TV aerials must observe a distance when fitted on the roof.
    For instance, coupling two TV aerials to enhance their gain requires that they are one dipole size apart.

    yup, when COUPLED, at the same frequency, for the same receiver.

    these are different freq, and different units


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    #8
    Irish Stones
    Registered Users Posts: 2,307 ✭✭✭Irish Stones


    martinedwards wrote: »
    Irish Stones wrote: »
    What I know is that even two TV aerials must observe a distance when fitted on the roof.
    For instance, coupling two TV aerials to enhance their gain requires that they are one dipole size apart.

    yup, when COUPLED, at the same frequency, for the same receiver.

    these are different freq, and different units
    Very good point! Thanks! :)


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