Brian Gaff wrote:

Hi folks, just in the last two weeks I've had some resets of a freeview box,
and decided to listen around the bands to see if it was being caused by
some odd mains borne stuff. It seems it is.
The offending signal is easily detected 24 hours as a kind of arcing noise
every 30 seconds or so.

Aubible directly or through the amplification ? Does it come from the box or a
wall wart etc ?

Graham