Okay, I tried scoping the signal with and without the stabilizer. It DOES clearly eliminate that moving demon pip. Here's the un-stabilized signal:
Here's the signal with stabilizer:
"This thing has GOT to work," I told myself. Once again, I hooked up the stabilizer between the cable box and the modulator. Guess what -- it does work, after all !
Don't ask me how I concluded that it didn't work before. Too many cables, not enough brains, probably
Thanks for the advice, anyhow. If I hadn't gotten some encouragement to investigate things further, I probably would have given up and just lived with the problem.
Regards,
Phil Nelson