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Capacitance Hat's Don't add Audio

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  #1  
Old 02-15-2011, 08:01 PM
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Default Capacitance Hat's Don't add Audio


Basically the idea of a capacitance hat is to make up the length needed for resonance while limiting the vertical height. It can be a disc or wires, mesh etc anything that will add capacitance to the antenna.

To reduce Q in an antenna system, we can either improve the ground properties or add a capacitance hat above the coil. It will act like a big capacitor in lowering the resonant frequency of the antenna


Starting simple - a vertical antenna is in reality a simple series R-L-C resonant circuit. The vertical wire, rod, or tube is the inductor, L. The same vertical mast, in combination with the radials, forms the capacitor, C. Completing the circuit is the antenna radiation resistance Ra. Antenna radiation resistance varies with the length of the antenna. It shrinks as antenna length shrinks.



*******************************************
http://www.angelfire.com/psy/mrcoily/id37.htm

Mr. Coily Sales Pitch Version from his website

The "Original" Audio Ball top hat!!


"""Dictionary Version"""
Capacitance hat - This is a device sometimes found at the end of an element. It can be a cross, a disk, a ball, a loop, or just about anything conductive. It makes the element behave as if it is longer, maybe 10%-30% longer than it really is. It can save space with Gains in performance! It must Be Correctly designed,spaced,and it is extremely important that the top hat wires be symmetrical around or across the connection point.

************************************************** *******************


Here is the web site Mr coily gleaned his information from and he conviently added his spin on it, and he is calling it a dictionary definition? It is a HD TV web Page that he added


Glossary A to F

"Capacitance hat - This is a device sometimes found at the end of an element. It can be a cross, a disk, a ball, a loop, or just about anything conductive. It makes the element behave as if it is longer, maybe 10%-30% longer than it really is. It can save space with almost no drop in performance. Capacitive hats are uncommon in TV antennas. (The Channel Master 3671B has six capacitive hats.)


************************************************** ***********

Contrary to belief a Top Hat/Cap Hat does nothing for the Audio. The term Audio Ball came from guys who run alot of power which can create a Plasma at the end of the antenna from the sharp edge. You would be able to hear a persons voice. Putting a round ball on the end will eliminate a plasma from forming.


"When buying a antenna don't beleive this hype"


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Old 02-15-2011, 08:08 PM
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So do the dual loops at the top of a vector 4000 act as a cap hat or a coronal ball?

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Old 02-15-2011, 08:09 PM
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and I see Mr. Coily has a similar device on his antenner.


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Old 02-15-2011, 08:27 PM
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on another forum coily told me those loops add 17 inches of length to his antennas . im sure tree branches love them

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Old 02-15-2011, 08:47 PM
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Quote:
Originally Posted by BOOTY MONSTER View Post
on another forum coily told me those loops add 17 inches of length to his antennas . im sure tree branches love them
I wonder if it will add ''s to um, never mind but it is CB and snake oil is everywhere.

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Old 02-15-2011, 09:12 PM
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Is it my turn to say something obvious?
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Old 02-15-2011, 09:22 PM
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Since no one yet has replied to this comment:
Quote:
It makes the element behave as if it is longer, maybe 10%-30% longer than it really is.
I ask, "Does it?"
If so, then, with respect to it offering the equivalent of additional physical length in electrical length, would it not then present increased gain in performance? That's all the ad said, and nothing about antenna gain in db's.

Nothing in the ad paragraph said the ball added audio. Furthermore, one may call his antenna, and its components, anything he wants. There are Penetrators, which penetrate nothing, there are Punishers, which punish nothing, and there's a Thunderpole, which is more a pole than thunder, none of which by their names suggest themselves to be more than they are, misnomers that pass for names.

You'll need more than this to make a reasonable case for the argument.
Audio balls, golf balls, basketballs, football, and certainly not beach balls increase audio, but decently optimized antennas do help one to hear more than poorly optimized antennas, and who cares if they are called Gain Masters, I10k's, Imax2000's, or A99's? It's a sales gimmick that simply implies an advantage to using this antenna exactly as the glorified names of countless other products have.

I find the name AUDIO BALL, appropriate. Radio is first of all about audio, who and what you hear, and who or what hears you. The implication that one can effectively use this antenna with its audio ball to transmit and receive audio seems rather appropriate.

Gotta do better than pick on a silly name for a ball on the end of an antenna.
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Old 02-15-2011, 09:25 PM
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Quote:
Originally Posted by MrSuburban View Post

"""Dictionary Version"""
Capacitance hat - This is a device sometimes found at the end of an element. It can be a cross, a disk, a ball, a loop, or just about anything conductive. It makes the element behave as if it is longer, maybe 10%-30% longer than it really is. It can save space with Gains in performance! It must Be Correctly designed,spaced,and it is extremely important that the top hat wires be symmetrical around or across the connection point.

************************************************** *******************


Here is the web site Mr coily gleaned his information from and he conviently added his spin on it, and he is calling it a dictionary definition? It is a HD TV web Page that he added


Glossary A to F

"Capacitance hat - This is a device sometimes found at the end of an element. It can be a cross, a disk, a ball, a loop, or just about anything conductive. It makes the element behave as if it is longer, maybe 10%-30% longer than it really is. It can save space with almost no drop in performance. Capacitive hats are uncommon in TV antennas. (The Channel Master 3671B has six capacitive hats.)


************************************************** ***********
theres a huge difference between "almost" no loss in performance and "gains" in performance.change a couple of words and you can make just about any sentence mean something completely different.

although i can't help wondering if thats just Coily's interpretation on what he read on that site in the same vein as the way he interprets the ARRL book. like i said before anyone can read books/webpages but actually interpreting what is there correctly is a completely different kettle of fish.
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