Thread: Dish reflector
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Old April 16th 09, 12:40 PM posted to rec.radio.amateur.antenna
Cecil Moore[_2_] Cecil Moore[_2_] is offline
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First recorded activity by RadioBanter: Mar 2007
Posts: 3,521
Default Dish reflector

Richard Clark wrote:
You are simply hoping your scope
is within its range of capability ...


Measuring the delay of a 4 MHz RF signal through a
device is hardly any different from measuring the
delay of a 4 MHz digital square wave. Measuring
the time from one zero-crossing to another is
virtually a no-brainer. It doesn't take much of
a setup to detect the difference between 25nS
for the traveling wave current and w8ji's measured
3 nS or w7el's measured undetectabe (faster than
light?) phase difference using the total current
in a standing wave antenna which is 90% standing
wave current.

Please design and run your own perfect experiment
for determining the delay of a traveling wave through
a 75m bugcatcher coil. I guarantee, if you perform it
in a valid manner, it will agree qualitatively with
my experiment.

What is it about the phase shift in 90 degrees of
monopole that you don't understand?
************************************************** **
EZNEC+ ver. 4.0
thin-wire 1/4WL vertical 4/16/2009 6:33:09 AM
--------------- CURRENT DATA ---------------
Frequency = 7.29 MHz
Wire No. 1:
Segment Conn Magnitude (A.) Phase (Deg.)
1 Ground 1 0.00
2 .97651 -0.42
3 .93005 -0.83
4 .86159 -1.19
5 .77258 -1.50
6 .66485 -1.78
7 .54059 -2.04
8 .40213 -2.28
9 .25161 -2.50
10 Open .08883 -2.71
************************************************** *

From your data, from your math, and from your argument.


There was no missing energy. Your superposition of
power was the problem. A three watt wave does not
destructively interfere with a two watt wave to
obtain a one watt result. That was explained to
you years ago when you first made that conceptual
error. The correct power merging equation must
contain an interference term unless the two
interfering waves are 90 degrees out of phase.

Hint: 3w + 2w - 2*SQRT(3w*2w) = 0.101 watts

There's no missing energy!
--
73, Cecil, IEEE, OOTC, http://www.w5dxp.com