I thought this might be interesting:

The pulsing is 2ms or so as far as I have read and way more often than I thought.
I am assuming that all pulsed signals will effect PI perfomance,
no matter what the base frequency. Is that correct?
If so, could we or Qiaozhi or Carl make a sticky which has a:
- collection of possible EMI sources to look out for in urban settings (low distance range) and in house.
- sources that are more far reaching (I think Ferric Toes mentioned Digital TV broadcasts or something along these lines)
which can drive PI builders nuts?
The pulsing is 2ms or so as far as I have read and way more often than I thought.
I am assuming that all pulsed signals will effect PI perfomance,
no matter what the base frequency. Is that correct?
If so, could we or Qiaozhi or Carl make a sticky which has a:
- collection of possible EMI sources to look out for in urban settings (low distance range) and in house.
- sources that are more far reaching (I think Ferric Toes mentioned Digital TV broadcasts or something along these lines)
which can drive PI builders nuts?