Not sure but maybe the AlexTune is detuning the antenna slightly. Try running the NanoVNA with the AlexTune clipped on there and see if the Nano results are different.
Tony
AD0VC
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From: loopantennas@groups.io <loopantennas@groups.io> on behalf of Todd - KE2AEQ via groups.io <ke2aeq+groups@...>
Sent: Saturday, January 11, 2025 6:51 AM
To: loopantennas@groups.io <loopantennas@groups.io>
Subject: [loopantennas] AlexTune: max brightness != lowest SWR?
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Hello all,
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I'm clipping an onto a W2LI magnetic loop antenna. I'm puzzled by something: the point at which it shines brightest is consistently about +20 kHz
above what a NanoVNA (and the transceiver) indicates is the bottom of the SWR curve (on 40M).
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What explains this? Is this a case where lowest SWR isn't necessarily where the maximum RF radiation is? Defective unit (would love to know what's inside)? User error?
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Thank you!
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-Todd
