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Capacitive hats are used to alter the distribution of the current on a short antenna so that the antenna current is not concentrated near the ground. A whip or short antenna can be modeled as a series of LC circuits in which the capacitance per unit length is highest near the base and the inductance per unit length is highest near the top. A capacitive hat simply adds capacitance to the antenna. It basically makes the antenna seem longer, but maximum current is still at the base.
The reason why you'd want to make your short antenna longer, is to obtain the antenna's resonance frequency. The length required to do this is a quarter or a half of the wavelength of the radio wave that it's receiving. At resonance, the electrical resistance of the antenna drastically drops, which effectively increases the Q factor, or quality factor, of the resultant output signal. The term Q factor is simply a measurement of how good the clarity and stability of the output signal is, the higher the better when dealing with radios and televisions.
Of course, instead of using a capacitive hat on your antenna, you could always physically lengthen the antenna itself. However, considering that commonly-used radio waves can be up to 10 m (33 ft) long, your antenna would have to be about 8 feet long, which would make using your radio a bit awkward.
What else can I help you with?
How many lives are saved using hard hats?
In theory, everyone wearing a hard-hat is likely to have had their life saved.
What is a fairy loop for?
whos the cat in the hat who played cat in the hat
Who invented the rain hat?
Maxine Snowden invented the rain hat.
Is a forklift driver required to wear a hard hat?
A forklift drive is not required to wear a hard hat. Wearing a hard hat is suggested for your safety though.
Do you need to wear a hard hat whilst on a forklift in a hard hat area?
Obviously
Does hat have a long a?
No. The A in hat has a short A sound, as in cat and sat.No. It is a short a.
Does hat have a long or short vowel sound?
Yes. The A in hat has a short A vowel sound, as in cat, sat, and that.
Does hat have a long a sound?
No. Hat has a short A sound, as in cat and fat.
Is 'Hat' a long or short vowel?
The vowel 'a' in 'hat' is considered a short vowel sound.
Is hat a long vowel?
No, the a in hat is a short vowel.
Does a have a short a sound in hat?
Yes. Words such as bat, cat, and hat have a type of short A sound.
Is the a in had long or short?
It has a short A sound as in hat and bad.
Does hat have a long a vowel sound?
No, the word "hat" does not have a long "a" vowel sound. It has a short "a" sound, as in the word "cat".
How do you spell top hat in English?
That is the correct spelling of "top hat" (short version of stovepipe hat).
Is that a short or long a sound?
The A has a short A sound in that, as in hat and sat.
Does that have a short or long a vowel?
It has a short A sound, as in than and hat.
Does 'that' have a long or short a sound?
It has a short A sound as in cat and hat.
