I used my good Yeasu all-band handheld with long 2 meter antenna, and discovered a whine noise from 160.200MHz then every 200KHz increment to end of RR band that came and went with TIU on and off with or without engines on track. Near track created the highest signal of course. No noise on two meter (144MHz), 1 1/4 meter (222MHz) or 70 cm (420MHz) or other non-ham bands. Interesting that it seems to only be in 160MHz. Signal was powerful enough to break squelch no matter where I was in room or nearby areas.
Of course this is highly unscientific method and probably a spread spectrum analyzer could spot other interference frequencies of interest, especially those that could beat againt the radios internal IF amplifiers. Or a different radio might hear other interferences.
