Folks, we're drifting OT. Please wind this thread down and then take it to
direct email if needed.
73,
Eric
List Moderator etc.
elecraft.com
On 3/31/2014 11:15 AM, Jim Brown wrote:
Sorry George, but that's not quite right. The attenuation, velocity factor,
and characteristic impedance of ALL transmission lines vary drastically
through the audio spectrum. All transmission lines behave to some extent as a
low pass filter (because attenuation increases with frequency), and the
variation in Vf causes the higher frequencies to arrive before the lower
frequencies. Loading coils were added to phone lines to compensate for those
variations. The result was to "flatten" both the amplitude response and the
time response in the audio passband, then allow it to drop sharply above audio.
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