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ARRL Handbook called that a "backwave".


Seems to me I discovered this trying to find a way to cure the CW "chirp" on my 15-meter signal in 1969. Back when a novice-license station had to use crystal control. The cure was to put a 150-Volt gas regulator tube on the screen grid of the oscillator and final, both. The Heathkit HX-11 had only two tubes. Until I added the third one.


Cured the chirp, and no backwave.


73