The odd thing is that the glitches in Iain's recording appear to occur a cycle or two before a frequency shift. It almost appears to be due to an improperly windowed FIR filter, but it could be caused by anything else...

If you have an audio editing program, you can see the envelope glitches quite clearly in Iain's wav file. There is one at 2.9235 seconds into the recording, and another at 3.253 seconds into the recording, for example. You can see the frequency shift about 2 or 3 msec following those glitches.

73
Chen, W7AY

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