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If you mean longer duration pulses, kinda like a thrumming sound, it might be diathermy. These are medical devices that use pulsed, HF radio waves, to induce deep tissue heating. Used to hear them all the time in the 60's and 70's.

Ignition noise is also, pulse interference, so not sure what you are hearing.

Rich

[QUOTE="Hamin' X, post: 65975, member: 1374"] If you mean longer duration pulses, kinda like a thrumming sound, it might be diathermy. These are medical devices that use pulsed, HF radio waves, to induce deep tissue heating. Used to hear them all the time in the 60's and 70's. Ignition noise is also, pulse interference, so not sure what you are hearing. Rich [/QUOTE]

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