can an SDRplay RSP1A (or similar) be used to analyze antenna SWR?

Discussion in 'Software Defined Radio (SDR)' started by AC1JO, Nov 16, 2020.

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  1. AC1JO

    AC1JO Ham Member QRZ Page

    I'm looking into building my first HF antenna, but I don't have my first HF transciever yet, nor any kind of antenna analyzer. To tune the antenna it would be helpful to be able to measure SWR and graph it at a range of frequencies, to find where the antenna is resonant. Can I do this with an inexpensive receive-only SDR, like the SDRPlay RSP1A? I understand these can be used as spectrum analyzers and I wonder if they can do the job of analyzing SWR as well.
  2. G0GSR

    G0GSR Ham Member QRZ Page

    They can but in addition, you would also need a wideband noise generator and directional coupler for the range of frequencies you need.

    E.g: Noise generator

  3. K7JBL

    K7JBL XML Subscriber QRZ Page

    Yes..but as has been said, you'll need some additional hardware (I think I spent about 40 bucks or so for a cheap noise generator and SWR bridge). I gave it a try and it works OK. But I ended up buying a NanoVNA. The SDRPlay with the Spectrum Analyzer software works pretty slick for just sniffing the air. Makes it real easy to see your own transmit signal.

    This is a video of mine being used on my yagi.


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