Getting rid of mobile phone galloping ghost from audio circuits.

With the proliferisation of mobile devices running on the mobile phone
network its getting increasingly a annoying to listen to things on a good
old fashioned or even new fangled radio, without the noise occurring at some
point. Even from next door one can get it getting into the audio chain.
Anyone know if there is an easy way to stop it. In the old days a few
capacitors got rid of Radio China or Vatican City, but due to the high
frequencies of the phones and the spiky nature of the handshaking noise,
this seems not to work much. What is the mechanism. they cannot be tuned to
the r frequencies, so is it just straight diode type detection due to the
huge signal level?

Low level circuits like turntables, microphone inputs etc, seem to be the
worst, but I've also proved my Denon is picking it up from its speaker
cables.

Brian

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