POTY Tuning help
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Look at it with a smith chart. Ideally follow the instructions in our original article.
Oh yes - and use a more sensible scan width - say 2.3-2.5GHz as otherwise the smith chart will be too messy on the screen. This should give you a much better idea of what adjustments are doing. Don't aim for a very good return loss, 20dB max or you will not be operating with the correct resonances.
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I suspect your NanoVNA is not calibrated within the NanoVNA Saver program.
In the program there is an assisted calibration function (Calibration/Calibration Assistant) and you have to activate it with the same cables that you will then use for the measurement on the antenna.
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That looks good. You are right it is critical on tuning, this is 2.4 GHz after all and it doesn't take much movement to make a difference. It really helps to be able to see what you are doing, hence the smith chart. You are aiming to get that little loop in the centre
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Thanks for the replies, I have it up now but the SNR is poor, I have started another thread on that,
Thanks
Trevor
EI2GLB
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OK - make sure you have the right lens in the right position.
Mike