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Does AM MW/HF have a Pre/De-emphasis?

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June 26th 05, 10:58 PM

craigm

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wrote:

I meant 20KHz for 10KHz recovered audio bandwidth.
I have some nice, but wide older Murata ceramics I salvaged
30 years ago from a (then) high end Kenwood tuner AM section.
I have them in a 35mm film cansiter labled 10KHZ. Sorry for
the sloppy thinking. It had a wide/HiFi positions as well as a
naorrow/distant positon. The "narrows" are like barn doors,
maybe 14~15 wide fora 6~7KHz signal, and the "wides" are
~21 wide giving just over 10KHz.

In a way it will be nice to use all this junk I have saved for the
last 3 decades.

Terry

If you have access to a spectrum analyser you can see what the
transmitted bandwidth is for some stations. You will find that many
transmit a lot more than what most radios pass.

For a real shock, look at the spectrum of an AM station transmitting
IBOC. You will want to have a narrow filter available to avoid passing
the digital hash.

craigm

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