I listen to Radio 4 a lot. My radio indicates that I use 12B 225.648MHz. Sometimes, I get an oscillation of volume at a constant frequency which I estimate to be around 10 Hz, making speech almost incomprehensible though quite audible. This can be cured by turning the radio off, after which I get a period of silence, a short burst of noise and the signal comes back OK. I have tired to cure this by using different portable radio sets and different radio headphone units, but nothing has worked. I am wondering if I am getting periodic pickup of two signals with a very slight frequency difference, so I am hearing audio frequency beats. Does anyone know what is happening?
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