On May 26, 1:19*pm, Cecil Moore wrote:
On May 26, 9:17*am, Cecil Moore wrote:

*If reflected energy is not allowed to reach the source, why
does the source impedance matter at all?

Continuing this thought thread - Assuming 50 ohm coax from the source
containing a forward traveling wave and no reflected wave, i.e. an SWR
of 1:1 on 50 ohm coax, what it to prohibit us from drawing our system
box through that piece of coax and considering the signal emerging
from that piece of coax to be the linear source signal which is
obviously associated with a V/I = 50 ohm impedance?
--
73, Cecil, w5dxp.com

If you are uninterested in source impedance (and many people seem
to be much more concerned with it than they need to be), then
by all means do not consider it, do not specify it, do not attempt
to compute it or measure it and do not make statements about what
the source impedance is.

But if source impedance is of concern for a particular application,
then please do compute and measure it properly.

....Keith

On May 27, 4:23*am, Keith Dysart wrote:
If you are uninterested in source impedance (and many people seem
to be much more concerned with it than they need to be), then
by all means do not consider it, do not specify it, do not attempt
to compute it or measure it and do not make statements about what
the source impedance is.

The question then becomes: If the system box does not include the
source and the system exhibits characteristics consistent with a
conjugate match, can we say the system is conjugately matched? For
instance:

100V---50 ohm coax---+---1/4WL 300 ohm feedline---1800 ohm load

This system exhibits all the characteristics of a conjugately matched
system. Can we say it is conjugately matched?
--
73, Cecil, w5dxp.com