(Scott Dorsey) writes:

Back in the seventies, the general RF level was a lot lower. Remember
back when you could actually turn on an AM radio and get decent reception?

At least in the US, the proliferation of cheap consumer electronics has
really resulted in incredible amounts of hash on the VHF bands and below.

Hell, I remember when those 40 MHz VHF-LO radio mikes worked great! I
could not imagine using one of those in the RF horror of any metropolitan
area today.

Nice story: at the university were used some cheap radio microphones,
that used the same frequency band of some (illegal here) cordless
phones near the 50 MHz band. Sometimes in the midst of a caclulus
theorem explanation instead of the teacher's voice we started hearing
some phone call, making the classroom start laughing.