Well, I seem to recall it was supposed to be only 10KHz, and often the
limiting factor was the bandwidth of receivers themselves. On the basis that the more the barn door is open the more muck flies in they reduced it to
9Khz I seem to recall. Of course stations like Luxemburg did as I recall transmit up to 12Khz a lot of the time. The problem is that after dark as
most of that stations output was in the dark, you tended to get a lot of
fading and co channel interference and most people could not use the extra bandwidth as their receivers were quite selective. Some of the widest band
ones were the cheap bakelite radios with droppers in the back ac and dc of course and got very hot, but they were simple and we as open as an aircraft hanger most of the time.
Pioneers medium wave tuner amps had a bandwidth widening circuit based on signal strength, which in a quiet electrical en environment were very nice
on Am.
I just wish they had not called the ferrite Rod a loopstick in their instructions.
Brian
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"Scott" <
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Can anyone confirm a theory I have heard that fits in with my own recollection? The theory is that pre-1978 AM transmitters used much
larger bandwidth - often exceeding what was officially allowed - and
the audio quality was far better than AM is today.
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