Re: Mismatched Zo Connectors

On Thu, 24 Aug 2006 14:22:24 -0700, Jim Kelley <jwkelley@xxxxxxx>
wrote:

Cecil Moore wrote:

How does a wave know whether to
carry energy or not depending upon its future fate?

Hi Jim,

I don't know how you can pass up all these tarnished jewels.

Energy at the speed of light has no time dimension (Lorenz law) and as
such there is no futurity. No future, no fate - presumptions aside
(or galore, depending upon the source).

Does a laser beam reflected from an ideal mirror carry any
less energy than the forward beam just because it has been
reflected?

Of course it does.

Jim, your question was:

How much energy is "in the reflected wave" without a circulator load
resistor?

and we find, after having gone down the primrose path:

Yes, in both cases the voltage reflection coefficient
at the load is 0.707 making the power reflection
coefficient = 0.5, i.e. half the power incident upon
the load is reflected.

The common finding of an unterminated circulator load would offer
reflections from that port passing back to the apparent source, the
original mismatched load. Hence, that load sees more than 0.707
(whatever) - now from two "sources."

There is one way to prevent this, but Cecil doesn't have enough
experience at the linear bench to come up with that solution.
Certainly I can anticipate his fog of vectors and SWR mechanics with 1
second transmission lines blossoming in the swamp - but a real bench
tech could whip out the solution and make it work with less effort and
certainly not have to cobble up a phonebook thick stack of Xeroxed
proofs.

Very inventive. The question was posed without a load on the
circulator, not without a circulator.

You were expecting something else? ;-)

73's
Richard Clark, KB7QHC
.

Relevant Pages

  • Re: Mismatched Zo Connectors
    ... less energy than the forward beam just because it has been ... Is your claim that the above describes the system with, or without, the circulator load? ... in both cases the voltage reflection coefficient ...
    (rec.radio.amateur.antenna)
  • Re: The Extreme Failure of Poor Concepts in Discussing Thin Layer ...
    ... The incident wave traveling on the coax has too much voltage and too little current to supply the 25-ohm load. ... The rearward-traveling reflected wave sees the impedance discontinuity at the match point and 1/2 of the energy is reflected back toward the load according to the rules of reflection. ...
    (rec.radio.amateur.antenna)
  • Re: Standing-Wave Current vs Traveling-Wave Current WAS rraa Laugh Riot continues
    ... What causes 100% reflection when the power reflection ... The only energy "lost" by partial reflection in the process is that which is reflected back toward the source or stored in the system during the transient period. ... The sum of all the partial reflections equals the energy stored in the system (less the portion of energy admitted to the load or reflected back to the source). ...
    (rec.radio.amateur.antenna)
  • Re: Transmitter Output Impedance
    ... not the same mismatch as between the line and the load. ... The mismatch, of the reflection wave approaching the transmitter, is ... then that energy must travel to meet a matching load ...
    (rec.radio.amateur.antenna)
  • Re: Revisiting the Power Explanation
    ... real world load while asserting that it still exists. ... - Generator with 450 Ohm output impedance ... 450 Watts is being dissipated in the generator resistor ... a voltage reflection coefficient of -0.714 so the load ...
    (rec.radio.amateur.antenna)