On 6/30/07 9:01 PM, in article
1183262500.867144.17640@o11g2000prd.googlegroups.c om, "Radium"
<glucegen1@gmail.com> wrote:

> On Jun 30, 12:55 pm, John Smith I <assemblywiz...@gmail.com> wrote:
>
>> Use simple logic, you can modulate a dc (0 Hz) with higher freq (voice),
>> (hint, your telephone line is an example) right?
>
> The telephone does not use either AM or FM. It is simply the
> electrical equivalent of the sound that gets into the microphone. You
> input a 1 KHz tone into the microphone, telephone lines will carry a 1
> KHz AC current to the destination. The louder the sound into the
> microphone, the stronger the amperage in the telephone lines.
>


Good for you for catching that one. The effect of microphone current has
noting at all to do with AM.