Given the dismal harmonic supression of my first Pixie kit, I was excited to test another. While still not passing, it is isn’t absolutely dismal.
The readings were taken with a 40 dB external attenuator. So the fundamental is actually +25.1 dBm (or 320 mW). The 2nd harmonic is at +3.5 dBm (2.2 mW). This is is a reduction of 21.6 dB, still not meeting the 43 dB specification, but better than the first unit I tested, which only reduced the 2nd harmonic by 10.1 dB.
So why the difference? Could be component variation. Could be an assembly error.
