Originally Posted by edp773
Look for any loose metal parts that may rattle when you are riding. A vibration between two metal parts emits a radio signal. Possibly there is something causing this in your headlight.
When shielding with aluminum foil. place the shiny side toward the headlight. This is the side that reflects the signals.
It wouldn't be metal parts because a lot of my tests have been with the bike just standing still in my apartment or elsewhere.
I did try moving the light further away - it has kinda a funny design. The mount sits to one side of the stem and then a section curves over to put the light itself right about the stem so it is centered. So I tried setting it up so it actually curved AWAY from the stem. Didn't work, though maybe it will mean it will work occasionally.
Then I tried the aluminum foil again in that position - putting the shiny side inside (I'd bet I did it the other way before), and my quick test seemed to work. The battery compartment sits under the light and I covered both parts. Then I tried just covering the batter compartment, but it didn't work. Too bad since that would have been much easier to secure. Covering just the light did work. Now I have to figure out a way to do this so it doesn't come apart. Aluminum foil is not exactly the sturdiest stuff!
Thanks for the suggestions.