"engsol" wrote in message
...

As to 4800 baud radiating for 1 inch unshielded...not much chance of that.
The only exception might be if the rise time of the pulses was quick
enough...often seen in switching power supplies....to cause the old
'comb' of harmonics.

Indeed, that's why any decently designed device should have some form of
limit to the risetime, which is not hard at all. We simply put an RC network
on each dataline. But also having galvanically isolated inputs, which is
dictated by the NMEA standard, will ensure a proper balance in both wires of
an NMEA connection, ensuring minimal radiation. The problem is however, that
many manufacturers try to cut corners here.

Meindert