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Which antenna have more coverage?

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  • #16
    The difference will not be significant, but it's worth remembering that when you get a perfect VSWR of 1.0 at 50Ω
    As far as I know, in Rx SWR is not affecting. Tx does.
    Even you can use 75 OHm coax in a 50 OHm Rx port with no issues.

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    • #17
      Originally posted by EA1DDO View Post
      As far as I know, in Rx SWR is not affecting. Tx does.
      Even you can use 75 OHm coax in a 50 OHm Rx port with no issues.
      VSWR is a good indication of whether the antenna is well matched at the desired frequency, even if only used for receiving. What is not as critical is the actual figure.

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      • #18
        VSWR is a good indication of whether the antenna is well matched at the desired frequency
        Just my point of view:

        It is a good indication indeed but... in Rx only system, you donīt need "to match" anything. What you need is the best S/N.
        For example, to use 75 Ohm coax in a 50 OHm system, it is 0.17 dB loss. But the cost of a good 50 OHm coax, comparing with a average TVSAT 75 Ohm coax is not worth.

        So, use good 75 OHm. It will has much less loss and much cheaper than 50 OHm equivalent.

        Spend you effort in a good LNA and good filter.

        Cheers
        Maximo

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        • #19
          By the way, "antennas donīt have coverage" !!

          There are other topics in this forum explaining how it works.

          Iīll start a new topic for a project of a new antenna system.

          Cheers
          Maximo

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          • #20
            Originally posted by EA1DDO View Post
            Just my point of view:

            It is a good indication indeed but... in Rx only system, you donīt need "to match" anything. What you need is the best S/N.
            >snip<
            An antenna that is 'matched' or resonant on the required frequency will receive better than one that is not. Not a point of view, a statement of fact.

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            • #21
              Yes, that is a fact, but what I meant in this case is more important to get a good S/N, than to match impedances.
              In this case, only Rx, you will get much more better results with a better S/N from a mismatched antenna, than from a very well matched antenna and worst S/N.

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              • #22
                Originally posted by EA1DDO View Post
                As far as I know, in Rx SWR is not affecting. Tx does.
                Antennas are reciprocal. Bad SWR affects both directions with exactly the same attenuation compared to a correctly tuned antenna.

                Please stop your desinformation about antennas, it's not helping anyone.

                /M
                F-ESDF1, F-ESGG1, F-ESGP1, F-ESNK1, F-ESNV2, F-ESNV3 F-ESSL4, F-LFMN3
                P-ESGR, P-ESIA, P-ESIB, P-ESGF
                mrmac (a) fastest.cc

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                • #23
                  Originally posted by MrMac View Post
                  Please stop your desinformation about antennas, it's not helping anyone.
                  /M
                  Excuse me /M but this is a forum, not a personal web site or private blog. In a Forum all members can exchange his points of view, always with respect.
                  If you point of view is different than mine, fair enough, but I wonīt stop writing just because you donīt like what Iīm saying.

                  Regarding the antennas, I invite you to do that test, then share your results.

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