Charlie,
Thanks for the lead. I did a Google search on Bubble Jammer and found some interesting info. I also found a sample recording.
The Bubble Jammer and the Wobbler sound alike when heard separately. I spent some time listening to them both and comparing FFT spectrograms of the two signals.
I think while similar, the two are not the same signal. However, that is based on only a single example of what a Bubble Jammer sounds and looks like. If there are variations of the signal, then it might still prove to be the culprit.
If you or anyone have or know the whereabouts of more examples of the Bubble Jammer, I would really like to make comparisons with my recordings of the Wobbler.
Thanks again for the feedback,
W. Curt Deegan
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Seems to me the "standard" term is bubble jammer.
That's my two cents' worth, take it or leave it, sez I.
Charlie [WD9INP/4]
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