Antenna tuning

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  • #990
    pdh
    Participant

    I have an antenna tuner and am trying to use it whilst receiving only (i.e. I am not transmitting).
    Learning how to use a tuner for receive only has been ‘fun’ but I have learnt that you tune it by listening for the loudest ‘noise’.
    One way to finding the loudest noise (whilst tuning) is to watch the noise floor in the spectrum display – but this is somewhat hit and miss.
    Is there a way to find a digital readout (in SDRuno) of the average noise floor in the 2MHz band that is being displayed? Similar to the SNR readouts.

    #1258
    SolderSoldier
    Participant

    You might try using a signal generator attached to a wire to create a steady carrier. It might be easier to tune for a peak on a steady signal than the noise floor. I haven’t tried it so I don’t know how it will work. Just another approach.

    #1578
    Dave Riley
    Participant

    Tuning for maximum noise or ‘S’ meter is the easy way to go but;
    Usually if you connect your antenna and see some rise in the spectrum noise then you are about there..
    If you want to go to FULL antenna tune for receive then look around for a small, very helpful device known as miniVNA or anything along this line..
    They run for about $50 and will present you with an LCD screen illustrating a Smith chart that pins your antenna measurement to exact Resistance and Reactance values..
    If this becomes interesting enough for you to try then you might even download a free program called SimSmith, very interesting..
    73s from Dave-aa1a

    #1579
    Dave Riley
    Participant

    Tuning for maximum noise or ‘S’ meter is the easy way to go but;
    Usually if you connect your antenna and see some rise in the spectrum noise then you are about there..
    If you want to go to FULL antenna tune for receive then look around for a small, very helpful device known as miniVNA or anything along this line..
    They run for about $50 and will present you with an LCD screen illustrating a Smith chart that indicates your antenna measurement to exact Resistance and Reactance values.. Say 50 ohms @ resonance you will see a DOT which is the Bull’s eye center of the target, like throwing darts..
    If this becomes interesting enough for you to try then you might even download a free program called SimSmith, very interesting..
    73s from Dave-aa1a

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