You migth consider noice from the empge it is a computer, and those are known to interefie with radio reseption,
every time my GSM mobilphone rings my sound system gows BuZZ BuZZ BuZZ in an constant reyhem.

Mark
emaks rouls #10677
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Mark wait for mk III with a USB Host/slave (USB->GPS)(USB->Bluetooth)(USB->You name it)