Thread: VE9SRB
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Old June 9th 04, 08:50 PM
Walter Maxwell
 
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On Wed, 09 Jun 2004 19:16:39 GMT, Walter Maxwell wrote:

Hi Cecil,

Man, when I ask for you to humor me you certainly do it up brown!!

You've performed a magnificent job of detailing all the reflections and
re-reflections in the 1/4 wl transformer replacing the tuner. That performance
really took a lot of work, and I greatly appreciate it.

I haven't yet finished reviewing it to the point of verifying in my mind all the
various voltages, but I appreciate that the numbers came out correct.

However, I have another request for you. Can you find any forward voltages that
are appropriate to plug into Steve's Eq 9 and obtain 133.33 watts PFtotal ?

Walt


Cecil, I found the two Vfwd's we're looking for. They are derived from V1y and
V2y. 70.7 v and 10.94 v. The interesting part is that 10.94 v is the exact
increase in voltage resulting from adding 33.333 w to 100 w. This I knew many
moons ago. But one would never find this Vfwd without performing the complete
reflection analysis you performed. With this, plus the fact that a reflection
analysis on a stub matching configuration would not reveal this forward voltage
still makes Steve's Eq 9 invalid for general use. This is because the
re-reflected forward voltage there, 40.82 v added to the source voltage 70.71 v
does not equal the real total forward voltage of 81.65 v.

Therefore, my final comment on Eq 9 is that it works in specific cases but it
certainly is not valid in general.

Thanks again, Cecil, for the elegant reflection analysis, bravo!

Walt