On Apr 2, 5:19 pm, Cecil Moore wrote:
Keith Dysart wrote:
This means that reflecting back into the generator from the
left end of the 75 Ohm line will be the same Pref2 = 229.6 W
that exists on the right side of the 75 Ohm line section.

Since ZERO reflected energy exists anywhere on the
75 ohm line, your assertion doesn't make any sense.

Please try again after adding 1 more wavelength of 450
Ohm line between the generator and the 75 Ohm line you
added. Kindly explain where the 'reflected power' on
this new section of 450 Ohm line goes.

Now consider that the 75 ohm line can be one foot
long and everything is the same as the 1WL of 75
ohm line (except the delays).

This would be quite incorrect. The impedance presented to
the generator is quite different. Do recall that by design
the generator has a 450 Ohm output impedance so there is
a physical discontinuity at the connection to the 75 Ohm
line. In this case the 75 Ohm line is acting as an impedance
transformer and its length is very relevent. Make it a
multiple half wavelength and the transformation is unity.
I had assumed that this was why in your first analysis
you chose to add one wavelength of line and state that
this would not alter the steady state response, to which,
of course, I agree, though it quite alters the transient
response.

....Keith