>> This explains why on old cars the radio switches off momentarily as you 
>> start your car.
>
> What do you mean "old cars"?

On most new cars the entertainment system must function correctly for supply 
voltages over a very wide range, like down to 6 or even 4 volts, and up to 
16 or 18 volts.  This means that the radio (and all the other stuff like 
satnav, climate control display etc) won't turn off while you start the car.

In the past the radio wasn't specced this high, and it was ok to only work 
down to say 10 volts.  Of course this meant that when you started the 
engine, the voltage dropped down to 6 or so volts and the radio turned off.

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