You are asked to design an end-fire array using two quarter-wave vertical antennas that are separated by a half wavelength. Two separate coaxial cables with VF = 0.65 are used to connect the transmitter to each antenna, and the operating frequency is 7.5 MHz. If the first antenna is driven with a length of coax that is 50 meters in length, what is the required length of the second transmission line in meters?a) length of first line in wavelengthsb) length of second line in wavelengthsc) length of second line in meters

Explanation:

Given that,

Two operating coaxial cable

Velocity factor VF = 0.65

Operating frequency f = 7.5MHz

Length of Coaxial cable 1

L = 50m

Let calculate the wavelength of the coaxial cable

Electrical wavelength of the transmission line is described as

λ = 983.6 × VF / f

where

λ = wavelength, in ft

f = frequency in MHz

VF = velocity factor.

Therefore,

λ = 983.6 × VF / f

λ = 983.6 × 0.65 / 75

λ = 8.52ft

Since it is a half wavelength then,

λ = 8.52/2

λ = 4.26ft

1ft = 0.305m

λ = 4.26ft = 4.26 × 0.305

λ = 1.3m

The actual length is given as

L = 150×VF/f

L = 150 × 0.65 / 75

L = 1.3m

Then, the actual transmission length is equal to length of the second line in wave lengths.

Option B is correct

explanation:

you only need simple sentences to answer this. just answer these questions.

what do you think annie thinks of the mother? do you think annie believes the mother is a fit mother for helen.

what about the father? what would annie think of him? she might not like him, but does she respect him.

how about the son? would annie think he is the only voice of sanity in an insane place?

what about helen herself? this is the key question. how does she see helen? what do you suppose she thought her first job was going to be.

these aren't hard questions. just state the obvious. annie is not that well educated: she just knows what she has to do. write it that way.

you can do it if you've read the book or seen the play or movie.

a. "to practice" is the best phrase to complete the sentence.

explanation:

during the summer, she likes to practice her soccer skills so that she is ready to play in the fall.

(note that : all the other options "the practicing of", "practice for" and "to do a practice on" are inappropriate as they make the sentence grammatically incorrect.)