[RFI] Burst of buzzy tones from speaker of turned off radio

[Cortland Richmond]

Sounds like rectified GSM RF.

Cortland
KA5S

On 9/27/2012 0922, Barry Merrill, W5GN wrote:
> We were staying in a motel off the Interstate in Blytheville, AR,
> and the AM Clock Radio, which had been left on but had the volume
> turned all the way down,  had several instances (5 times in 3 hours)
> when a burst of cw-like, raspy tones, sounding like three letter
> U's run together, were heard quite loud.
>