Hi erik.
Yes i am aware of that. Thanks.
Glenn?
Sent from my Samsung Galaxy S7 smartphone.
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-------- Original message --------
From: erik@...
Date: 4/4/20 6:39 pm (GMT+10:00)
Subject: Re: [HBTE] TinySA.ino GUI testing #tinysa
When measuring harmonics ALWAYS repeat the measurement with a different level of attenuation to ensure the harmonics are not internally generated.
If the harmonics move down in level compared to the fundamental with increased attenuation the harmonics are internally generated. This happens when you apply a "strong" signal and is due to the? IIP3 level of the tinySA somewhere between +7dBm and +15dBm (depends on the mixer, mixer drive level, attenuator pads around the mixer and attenuation in the LPF)
If the harmonics stay at the same level compared to the fundamental when you increase attenuation the harmonics are actually present in the input signal.
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HBTE Files section:?
/g/HBTE/filesErik, PD0EK
