0
For horizontal antennas operating below 30 MHz the optimum height is half a wavelength, so the height in metres would be 149.9/Frequency in MHz.
Wiki User
∙ 8y ago
Add your answer:
Earn +20 pts
What is the half wave dipole?
effective height of half wave dipole antenna
What is the impedance of a full wave dipole?
Typically, the desired frequency of operation is known, and the purpose of thecalculation is to identify the best size for the dipole antenna. The most oftenused formula to find that length isLength = 468/frequency, MHz feet, or 142.6/frequency, MHz meters.That gets you close, but some tweaking and trimming is usually required afterconstruction, because some of the characteristics of the installation, such asthe antenna's height above ground and method of supporting its ends, affectthe antenna's properties.The wavelength corresponding to that frequency isWavelength = 300/frequency, MHz meters, or 984/frequency, MHz feet.The way your question is written, it appears that you already have the antenna, andnow you want to know the frequency at which it will operate best. I must tell youhow peculiar this sounds to anybody in the radio business. But I'm here to answerquestions if they make sense, not to judge how impractical or useless they mayactually turn out to be. So here goes:For the first time ever, you've just noticed a horizontal wire hanging between twotrees in your back yard. Rather than simply tearing it down, you're curious to knowthe frequency/wavelength at which it could most efficiently transmit/receive whenoperated as a half-wave dipole. So you measure its length somehow, and call thelength ' L ' .-- If you measured ' L ' in feet, then the best frequency to try first is 468/L MHz.The corresponding wavelength is 2L feet, or 0.6096L meters.-- If you measured ' L ' in meters, then the best frequency to try first is 142.6/L MHz.The corresponding wavelength is 6.562L feet, or 2L meters.
What is the standard distance between the ceiling and a wall mounted light fixture in a bathroom?
The height is usually based on the type of mirror that is to be installed above the sink. Take the height of the sink plus the height of the mirror and add 6 inches to find the center for the placement of the fixture junction box. If there is to be a space between the sink and the mirror add that measurement in to factoring of the height.
Which type antenna used for radar communication?
Radar and communications are two different applications of radio waves. For radar, directional antennas are used, and the normal antenna for a ship installation would be a parabolic reflector with a rectangular aperture about 5 times wider than its height. This gives a narrow beam in the horizontal direction, and pulses are sent out and detected after being reflected by the target.
What is the height of a light switch above a kitchen countertop?
usually most light switches sit between 42'' and 48''
Is there any relationship between speed and height?
Yes , there is a relationship between height and speed . Which is that to get fast we need to be tall . Height isn't anything weight can slow you down so speed also consists of height that is the relationship between speed and height
When a short grounded vertical antenna has a length L which is 0.05 1 at frequency f and if it's radiation resistances at f is R Ohms then its radiation resistance at a frequency 2f will be?
In ideal conditions the radiation resistance of a short antenna is proportional to the square of the height in wavelengths. So doubling the frequency would produce 4 times the radiation resistance. Rr is 1578(He/lambda)2 for a short antenna, He < lambda/8. He is the effective height, equal to half the physical height for a simple monopole, rising to the physical height for a monopole with an infinite amount of horizontal top loading.
What is the relationship between the height and width of an object?
height =1/width
What is the relationship between height and energy?
P.E.=mgh
What is the relationship between energy mass and height?
gay\
Is there a relationship between your arm span and height?
Yes.
What is the relationship between height and arm length?
The length of one arm is about 40% of your height
Is there a relationship between height and the circumference of your head?
Height is how long circumference is the distance around
What is the relationship between the frequency and amplitude of a wave?
amplitude is the height of the wave from the middle point, it can be either from the middle to the bottom, or middle to the top of the wave. the frequency is how frequent the crests of each wave (the amplitude) pass a given point. so how they relate is, the highest point/lowest point is the crest, and the that is the amplitude is the ends of the crests ============================================ (In other words, to paraphrase the above remarks, there is no relationship between the amplitude and frequency of a wave. Either characteristic may be changed with no effect on the other.)
What is the relationship between energy mass and height potential?
gay\
What is the relationship between the area of a triangle and a rectangle?
The relationship between the area of a triangle and a rectangle is a Triangle is base times height divided by 2. Area of a rectangle is length times height.
What the difference between histogram and a bar graph?
A bar graph cannot have classes with different width. The height of a bar graph represents the frequency attributed to that class whereas in a histogram the area of a "bar" is proportional to the frequency, the height represents the frequency density.
