I'm hoping that we can find a cheap way to measure for spurs.? I built the 7mhz band pass filter based on the QRP labs kits one and put it on the antenna for testing.? I think it cleaned up some of the spurs/harmonics but it's still showing one when transmitting at 7.15MHZ at about 28MHZ range that is only -30db on the scope FFT - since its only 8bit ADC not sure if it's accurate or not.
I wish I knew if the? scope FFT amplitude was accurate.? I love the frequency range on it, can view huge swaths of spectrum
