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Who knows about the Conjugate Match?

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Old 06-09-2011, 09:31 AM
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Default Who knows about the Conjugate Match?


I have nothing useful to post to this thread except an observation, and perhaps a question.

I watch the late night show on truTV sometimes where the repo guys go after a vehicle. There is this somewhat muscled up fellow named Matt who talks really tough until the action starts, then his retreat gear kicks in. A whole lot of talk, and then he runs. THe females on the show are actually tougher than this fellow.

Ok, here's the deal. Across the www. I see threads going well and then someone mentions the Conjugate Match (sounds strangely like a girlfriend/wife prison visit in boxing gloves). At that point the thread makes a sudden plunge to its death. Over. Zip.

It seems this topic is the Bermuda Triangle of antenna systems. Topics go here to disappear forever. Additionally, any info I can find seems to be written in a language known only to the initiates of The Society Of Those Who Have Nothing Better To Do Than To Hear Themselves Breathe. The effort to read the stuff bores a pragmatist like myself to death. I quit reading when I start smothering.

Here's the 2-part Question:

Does anyone know What It Is, and can they say/write it in layman's terms expressing what is being done to achieve it.

Most of us want to build antenna systems, not write new college level math books.

I know it's controversial. So? We on this forum argue over whether poop stinks.

Call me a dummy, just try to answer the question as requested and we'll sort the dummies out as we go.

Thanks,
Homer
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Old 06-09-2011, 10:33 AM
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Homer, maybe the theoretical conjugate match is right on point as Maxwell and other's have described, but for me it's like looking at a bowl of corn meal and trying to describe to someone what I see in terms of the sub-atomic level of the atoms present.

This is a subject much like when I hear guys talk about things making a difference and then not describing what that difference means in understandable terms.

Most of the time, it turns out that these differences are so insignificant as to go totally unnoticeable in real world practical applications, and for sure if I can't see the difference in operations of my radio from one end of a >2.0:1 bandwidth to another, there is no difference unless we are studying nature and its elementary processes.

The term "conjugate match" refers to just such a difference, and I ask what does the difference mean to me? The answer is Nothing!

Sorry, I don't have the definition you wanted.
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Old 06-09-2011, 10:35 AM
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A conjugate match is a device which contains components possesing an equal and opposite reactance of that in an AC load.

Example:

Your short mobile antenna is capacitively reactive. It has an impedance of 65 -22j. An inductor with a reactance of +22j will allow all of the RF power to reach the 65 ohm load if placed inseries with the feed to the load. This assumes lossless components.

Note the 65 ohm load is now entirely resistive. It behaves exactly like a 65 ohm resistor. Something still must be done to match to a 50 ohm source if the SWR cannot be tolerated.

If you want the rest from the horse's mouth do a google on W2DU. He explains it a whole lot better than I ever could.

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Old 06-09-2011, 10:40 AM
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Hommer, here is a good read....on the theory
http://p1k.arrl.org/~ehare/temp/conj...ch_theorum.pdf

73
Jeff
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Old 06-09-2011, 10:43 AM
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Thanks, everyone.
Will I smother to death if I read those links? Been having a little bronchial issues lately . . .
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Old 06-09-2011, 10:46 AM
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"The Society Of Those Who Have Nothing Better To Do Than To Hear Themselves Breathe."

sorry i can't help with your question . but i had to comment on your line above
i am looking forward to comments on your topic tough .
the $20-$100 words leave me lost and wanting a nap too

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Old 06-09-2011, 10:57 AM
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Booty, when my kids were young my very intelligent daughter used big words in everyday conversations not because she showed off, but because she understood them and they came first to her mind when talking. Her brother, less inclined in vocabulary though quite intelligent otherwise finally said to her, "You don't have to use words as long as a crowbar".
Hopefully, some sense can be made of the subject at the common level. If not, I have doubts of its value as Marconi said.

As for now, there seems to be a vacuum either in the Book for Dummies series, or there is a whole passel of folks out there who appear to be educated beyond their own intelligence.
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Old 06-09-2011, 11:45 AM
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Homer as an example, Kamikaze gave us a matching scenario of 65 -22J at some point in his antenna system. Now he isn't resonant there and we know that the match is not perfect, so I'll ask what difference will that make?

I would also argue that a conjugate match is not a device, but maybe Kamikaze didn't mean it that way.
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