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tuner - feedline - antenna question ?
On Wed, 28 Feb 2007 05:05:47 GMT, Owen Duffy wrote:
If you read and understood the article, you would see that the instrument is based on sampling the V/I ratio at a point, and that being surrounded by transmission line is not important to the principle of operation, in other words, it does not directly measure a reflected wave. Hi Owen, Can you express it without the presumption and still carry the argument? I have read and understood many treatments on the topic, and none claim to be the sole and unadulterated truth as it is generally understood that many analyses work simultaneously and none deny the validity of the others. You have not yet actually offered any treatment that denies the bone of contention that lies in two subject lines: 1. Reverse power is manifest; 2. The source will absorb and dissipate it. You may have struggled with others over this in times past, but by your own descriptions they had little intellectual horsepower, and less experience in the matter. I have attended schooling specific to these issues, and have practiced professionally in their measure to the highest of standards. My peers have instituted national metrology laboratories in your half of the planet (OK, so it was Korea). I have measured SWR with Bruene designs (as vulgar as that is); Directional Couplers, Slotted Lines; and power with half a dozen different style of sensors, and as many different methodologies. I have also calibrated these instruments (all of them including the vulgar Bruene designs). I can separate out the constituent waves (in spite of the denial of their existence) by several means - each appropriate to the problem at hand. I can measure excessively high SWR precisely where others would shrug and simply call it infinite (it isn't). I can also reduce residual SWR (anyone know what that is?). I've done this over a spectrum from nearly D.C. to 12 GHz. And I get a chuckle out of a claim for 0.014dB loss when I know full well through experience it is unverifiable, unmeasurable, and hence unproveable except in a spread sheet as a statistical curiosity. 73's Richard Clark, KB7QHC |
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