Posted by John Davis on February 16, 2023 at 05:58:27.
In Reply to:Mystery Whoopers posted by Ed Holland on February 15, 2023 at 20:58:38.
Interesting, Ed. Out here, the "big whoops" tend not to show back wave, but then again, I never figured it would entail such a wide shift of 100 Hz or thereabouts. Took a look from here late this afternoon, but no joy.