wrote:
wrote:

Wes Stewart wrote:

Read the text, Bozo. And then repeat after me: Rho can be greater
than one, rho can be greater than one, rho can be greater than one....

Repeat after me, Dweeb-head: Only with Return Gain, Only with
Return Gain, Only with Return Gain.....


Now, now, boys, be nice. Both of you can be right if you are not
talking about *power* gain. Since you are discussing VSWR, rho can be
greater than one AND the voltage return gain can be greater than one.
The voltage across a resonant circuit depends upon the 'Q' and can
certainly be higher than the applied incident voltage. For that exact
same reason, Vref can be higher than Vfor. It occurs when the load is
the conjugate of Z0 and Z0 is not purely resistive.
--
73, Cecil http://www.qsl.net/w5dxp


Given a 396 meter length of Radio Shack RG58. At 250 kiloherz TLD says
(after some manipulation) that it has a propagation constant of
689.6 X 10^-9 + j7.933 X 10^-3. Zo is 50 -j4.344. Feed it with a
voltage source of 100 volts with a source resistance of 50 ohms.
Put a load on it of j50 ohms. The voltage reflection coefficient at the
load is -4.116 X 10^-3 + j1.091. The absolute value of this number is
1.091, a number greater than one. The power into this line is .1088
Watts. Fine. However, if I calculate the power at the middle of
the line, I get -34.42 watts, a negative number. Moreover, the SWR
calculated at the beginning of the line is -23.21.
What is negative average power?
What does a negative SWR signify?
73,
Tom Donaly, KA6RUH