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On Dec 27, 8:44*pm, John Smith wrote:
RHF wrote: OK then what is a 'matchbox' in : * a poorly designed transmitting antenna, * a mismatched transmitting antenna, * a non-physically resonate transmitting antenna, Consider the 'matchbox' to be one element in the RF Energy Radiating System : Feed-Line + 'matchbox' + Antenna Element - - i want to know - iane ~ RHF - - *. - It would be far more "in the realm of correct" to - consider what a matchbox DOES, rather than - what it IS--as it is simply some combination - of inductive and capacitive components which - ALWAYS will induce some form of loss into - any system it is inserted into. Yeah - Once it is 'placed' in the "System" the MatchBox becomes part of the "System" and becomes one of the loses within the "System" - However: - *a matchbox will allow you to use a poorly designed/ - constructed antenna--it will NOT improve the antenna. Now -if- That is True : Then Why Us The MatchBox within an RF Energy Radiating System ? - *a matchbox will allow you to "match" differing - impedances to achieve proper power transfer to - the antenna--again, it will NOT improve the - efficiency of that antenna, and the power will be - "simply lost" (as heat.) So you are say that a MatchBox will not improve the ERP of an RF Energy Radiating System ? And that the Receiving Station will not hear you 'better' when the MatchBox is properly used with the RF Energy Radiating System ? - *a matchbox CAN allow you to alter the electrical - length of an antenna--physical and electrical lengths - are two different animals. Electrical Characteristics = 'apparent electrical length' - And, this is all-in-a-nut shell; - as you realize, a proper education - in this field is NOT a trivial thing. A proper education in 'any' field is not a trivial thing. And that education can take many forms : formal practical, vocational {life time of work} and avocation {life time hobby} - That said, I frequently carry a cheap portable with me on trips and - launch a longwire into a tree, etc., find acceptable signals and enjoy - listening ... or else, just grab the SW stations audio from the net ... - being an old-timer, the first is more enjoyable, for me. - - Regards, - JS being an old timer myself - i still find simply listening to the radio to be enjoyable ~ RHF |
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