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COMMUNICATIONS 5

Directions: Write the letter corresponding to your answer !ro"ide solutions toite#s with pro$le# sol"ing

% &i"en a para$oloid re'ector with a dia#eter D() *eet and is operated at %5&+, What is the $ea#width $etween nulls o* the re*lector- ./

a 0o

$ 01o

c 22o

d 23o

1 !oint to point co##unication $etween A 4 6# 7'at terrain8 !oint A is ontop a hill- 133 *t a$o"e sea le"el- with a tower height o* 19# what is the#ini#u# height o* the antenna at point /

a )5 *t

$ 29 *tc 25 *td ) *t

9 One o* the *ollowing trans#ission i#pair#ents is not a pro$le# with#icrowa"e trans#ission Which one/

a Multiple *ading$ Ducted signalsc ;ain attenuat ionsd All o* the preceding

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a Cross#odulation distortion and inter*erence$ Inter*erence to other ser"icesc I#age reection and selecti"ityd Noise Fgure and distortion

) A dipole antenna reuires to $e *ed with 13 6W o* power to particular distantpointI* the addition o* a re'ector #a6es the sa#e Feld strength a"aila$le with aninput powerO* %% 6W What is the gain in d $y the use o* the re'ector

a