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  • Donor and distribution isolation

    Posted by Juan Zuloaga on September 9, 2022 at 6:49 pm

    Just wondering if 0.5 inch donor riser and distribution riser can run vertically in the same conduit/shaft? How much separation do they need to achieve proper isolation? Is this even significant?

    Regards,

    Juan Z

    Ankit replied 6 months ago 5 Members · 4 Replies
  • 4 Replies
  • Rick Angkham

    Member
    December 19, 2022 at 12:36 pm

    I don’t believe there is separation needed on coax. Isolation is needed with the donor antenna and the nearest server antenna to the donor. The only oscillation issue I’ve experienced is when the server antenna was below the donor and within 20-50ft. The remedy was to add a 6dB attenuator.

  • kwang

    Member
    January 4, 2023 at 10:29 am

    I agree with rick here. No physical separation needed between the donor and any riser cabling as long as it’s the same public safety DAS. Isolation is measured between the nearest serving antenna and the donor antenna.

  • Jeph

    Member
    June 16, 2023 at 11:19 am

    There is no required separation between the donor antenna and the riser/ cable. The only requirement for Isolation in public safety DAS is to have a 20 dB isolation measured between the donor antenna and any nearest omni/ Indoor antenna.

  • Ankit

    Member
    November 7, 2023 at 1:37 pm

    There is no required separation between the donor antenna and the riser/ cable. The only requirement for Isolation in public safety DAS is to have a 20 dB isolation measured between the donor antenna and any nearest omni/ Indoor antenna

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