Odd noises from the speakers

[AndyN01]

Hi,

Newbie on the forum having been a 75 diesel saloon owner for a matter of days.

I'm getting strange "beeps" and "clicks" every now and then from the radio

The unit is a Pioneer DEH 5000 UB which seems to be working perfectly.

It's like the unit is "picking up" random interference.

I was overtaken by a brand new BMW and that set it off good and proper

Any ideas or suggestions very welcome.

Thanks in advance

Andy.