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#1
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Looking thru various antenna pages on the web and I continually find
reference to inductance CANCELLING capacitance. The operative word should be BALANCING and the difference is important .. In all cases the capapicitor is still there and operative as is the inductance.One cannot say they are cancelled so they can be disregarded. You cannot make either of them inoperative or of no consequence even in the case where a clockwise wound inductance is in series with a counterclockwise inductance since by definition both are energy containers. When you have a resistive impedance for a full wavelength without a reactive component per se what it means is that the energy contained in each of the energy containers are equal thus allowing for symetry as in a loss less pendulum. If on does not have a full wave length you can still have equal energy sinks but their release of energy is not synonymous with each other thus there is no symetry. So concentrate on the word "balance" or "equilibrium" when maximum efficiency is required. Best regards Art Unwin....KB9MZ......xg |
#2
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"art" wrote
Looking thru various antenna pages on the web and I continually find reference to inductance CANCELLING capacitance. The operative word should be BALANCING and the difference is important. In all cases the capapicitor is still there and operative as is the inductance. One cannot say they are cancelled so they can be disregarded. etc etc __________ No matter what one calls it, equal inductive and capacitive reactance at the input terminals of an antenna system (eg, resonance) is important only in achieving the most efficient power transfer from a source connected to those input terminals having an impedance matching the remaining pure (non-reactive) resistance of the antenna system == Antenna system reactance neither absorbs source power nor radiates, whether such reactance is capacitive, inductive, or in "balance / equilibrium." == Only pure radiation resistance will do so, and that is set by the natural radiation resistance of the antenna conductor(s), which in turn is related to the mechanical and electrical configuration of the radiating structure, and the operating frequency. Setting up equal inductive and capacitive reactance values at the antenna system input terminals means that the real radiating structure of the antenna will receive the maximum power possible from a matched transmission line, which will maximize the fields that the system can produce from the net power available from the transmitter. RF |
#3
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![]() Looking thru various antenna pages on the web and I continually find reference to inductance CANCELLING capacitance. The operative word should be BALANCING and the difference is important . In all cases the capapicitor is still there and operative as is the inductance.One cannot say they are cancelled so they can be disregarded. You cannot make either of them inoperative or of no consequence even in the case where a clockwise wound inductance is in series with a counterclockwise inductance since by definition both are energy containers. When you have a resistive impedance for a full wavelength without a reactive component per se what it means is that the energy contained in each of the energy containers are equal thus allowing for symetry as in a loss less pendulum. If on does not have a full wave length you can still have equal energy sinks but their release of energy is not synonymous with each other thus there is no symetry. So concentrate on the word "balance" or "equilibrium" when maximum efficiency is required. Best regards Art Unwin....KB9MZ......xg I see your point, but I think the issue you are having with "balance" vs. "cancel" is more semantics than functional. It is easier to perceive the issue as a cancellation when making calculations and design, I think. Ed K7AAT |
#4
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On 20 Oct, 15:12, Ed G wrote:
Looking thru various antenna pages on the web and I continually find reference to inductance CANCELLING capacitance. The operative word should be BALANCING and the difference is important . In all cases the capapicitor is still there and operative as is the inductance.One cannot say they are cancelled so they can be disregarded. You cannot make either of them inoperative or of no consequence even in the case where a clockwise wound inductance is in series with a counterclockwise inductance since by definition both are energy containers. When you have a resistive impedance for a full wavelength without a reactive component per se what it means is that the energy contained in each of the energy containers are equal thus allowing for symetry as in a loss less pendulum. If on does not have a full wave length you can still have equal energy sinks but their release of energy is not synonymous with each other thus there is no symetry. So concentrate on the word "balance" or "equilibrium" when maximum efficiency is required. Best regards Art Unwin....KB9MZ......xg I see your point, but I think the issue you are having with "balance" vs. "cancel" is more semantics than functional. It is easier to perceive the issue as a cancellation when making calculations and design, I think. Ed K7AAT- Hide quoted text - - Show quoted text - Yes that may be true but with the increasing reliance on mathematics and computors the gimmicks that come with mathematics are distorting things. Tho an inductance may be "cancelled" out it is still there which created a magnetic field which may or may not be affected by an alternately counter wound inductance since energy is still being used to create a magnetic field amoungst other things. I would imagine if the inductances were used for storing energy mathematically that fact would be hidden leading research into a incorrect direction. For me who is working around the LC ratio with respect to antennas Ithere are advantages for maximum capacitance and inductance vessels for max time varience of energy discharge while at the same time keeping to the required LC ratio at point of feed since the larger the storage vessel the faster the energy release or explosion which then means a higher velocity for free electrons to carry communication. Note with respect to the H bomb tests in the Pacific where the more powerfull explosion wiped out the Honolulu electrical grid which had not happened before thus the velocity of the explosion or release had a direct relationship with radiation. Best regards Art |
#5
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"art" wrote
For me who is working around the LC ratio with respect to antennas there are advantages for maximum capacitance and inductance vessels for max time varience of energy discharge while at the same time keeping to the required LC ratio at point of feed since the larger the storage vessel the faster the energy release or explosion which then means a higher velocity for free electrons to carry communication. _________ Attention:"art" You have posted your concepts and beliefs here, but your posts on this topic are not supported or proven by physical science, and field results going back some 60+ years. Why do you persist in posting such claims? RF |
#6
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![]() -- ------------------------------------------------------ Antonio Vernucci, I0JX US call: K0JX 50-MHz beacon: 50.004 KHz FSK 10W 5/8 vertical antenna reference to inductance CANCELLING capacitance. The operative word should be BALANCING and the difference is important "inductance cancelling capacitance" is evidently an abbreviation for "cancelling the effect of capacitance" Your post reminds me of a guy who, when asked a glass of water, answered: but there no glasses made of water.... 73 Tony I0JX |
#7
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In article ,
"Antonio Vernucci" wrote: Your post reminds me of a guy who, when asked a glass of water, answered: but there no glasses made of water.... Obviously you have never seen "Stiff Water"...... You can make a Glass, or any other container out of Stiff Water....you just need to keep them below 0C......... |
#8
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Obviously you have never seen "Stiff Water"...... You can make a Glass,
or any other container out of Stiff Water....you just need to keep them below 0C....... You are wrong, as I know "Stiff Water" better than you do! As a matter of fact you only know one method for stiffening water, that is freezing it. I also know a second method: to drop a pill of Viagra into it! 73 Tony I0JX |
#9
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In article ,
"Antonio Vernucci" wrote: Obviously you have never seen "Stiff Water"...... You can make a Glass, or any other container out of Stiff Water....you just need to keep them below 0C....... You are wrong, as I know "Stiff Water" better than you do! As a matter of fact you only know one method for stiffening water, that is freezing it. I also know a second method: to drop a pill of Viagra into it! 73 Tony I0JX Not likely Bozo, us alaskans are the original source of Stiff Water..... |
#10
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Art, KB9MZ wrote:
"You cannot make either of them (L or C) inoperative or of no consequence----." Perhaps when L is said to cancel C, it is a short way of saying the reactances offset and the net is ithe difference of the two. Best regards, Richard Harrison, KB5WZI |
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