The suppression of harmonics and other spurious signals seems to be adequate so I did a few on air tests. I had to realign the lowpass filter a bit because the 2nd harmonic was too strong when the antenna was connected.
After that I used it in a weekly radio meeting. Reports I got were ok. The modulation is ok for narrowband FM. In FM 'normal' the modulation is not loud.
Besides that the high tones may need amplification.
Power output is now 2 Watt. It can make 6 watts using a separate power supply. I have a powersupply that fits but it produces too much spurious.
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