John, are you boonedocking or rv park camping?
You could try various isolated (pure ) power sources unrelated to the TT, such as a battery or AC extension cord and turn things off in the TT one at a time until the noise goes away if it will.
Don't forget about the cheap AM portable radio tuned to the low end of the commercial band and waved around the RV in search of interference.
Good luck, JIM
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