3 AC ONL;INE 2-2

1 . T h e S i gn a l t o N o i s e o f F m a t m o d u l a t i on i n d e x = 5 i s f a c t or of S /N of A M ( a) 7 5 ( b ) 8 1 ( c ) 7 0 ( d ) 5 7

2 . T h e S i gn a l t o N o i s e r a t i o of S S B - S C s ch e m e i s ( a) z e r o ( b ) 3 ( c ) 1 ( d ) 2

3 . T h e r at i o of S / N o f P M t o S /N of A M i s g i ve n by ( a) Δ f / fm ( b ) fm / Δ f ( c ) fm x Δ f ( d ) Δ f + fm

4 . I n F M , t h e p owe r s p e c t r al d e n s i ty o f t h e O / P n o i s e , va ri e s w i t h f re qu e n c y a s ( a) H y p e r b o l a ( b ) Pa ra b o l a ( c ) c i r c l e ( d ) U n i f o r m

5 . A B u ff e r a m p l i fi e r i s p l ac e d i n b e twe e n ( a) T wo A F A m p l i fi e r ( b ) T wo R F a m p l i fi e r s ( c ) M o d u l a te d an d m o d u l at i n g am p l i fi e r ( d ) C r y s t al os c i l l at o r an d h ar m o n i c g e n e r a to r

6 . T h e on l y d i s ad vant ag e of c r ys ta l o s c i l l a t or as M a s t e r o s c i l l a to r i s ( a) l a rg e s i z e ( b ) m o u nt i n g c a p ac i ta n c e ( c ) fi x e d f re q u e n c y ( d ) u n s t a b l e f r e q u e n c y

7 . A d e vi c e t h a t re d u c e s th e g ai n of A . F . a m p l i fi e r w h e n t h e i n p u t e x c e e d s p re d e t e r m i n e d va l u e i s c a l l e d ( a) D e t e c t o r ( b ) e ch o s u p p r e s s or ( c ) D i s c r i m i n a to r ( d ) Pe a k c l i p p e r

8 . M o s t o f t h e p owe r i n A M s i gn a l l i e s i n i ts (a) L S B ( b ) B o t h U S B a n d L S B ( c ) U S B ( d ) C a r ri e r

9 . T h e d i s a d va nt a ge of l ow l e ve l m o d u l a ti o n i s ( a) C l a s s A . F . a m p l i fi e r s c a n b e u s e d ( b ) A . F . p owe r r e q u i r e d i s l ow ( c ) C l a s s B . R . F . a m p l i fi e rs a re t o b e u s e d a f t e r m o d u l a ti o n ( d ) T h e s y s t e m c os t s m or e

1 0. T h e p r e d i s t o rt e r i n A r m s t r on g F . M ge n e ra t i on i s n o t h i n g b u t ( a) At te nu a t or ( b ) R e c t i fi e r ( c ) I nt e g ra t or ( d ) D i ff e r e nt i at o r

1 1. A l l c om m e r c i a l r e c e i ve r s e m p l oy I F b e twe e n ( a) 2 00 t o 3 00 K H z ( b ) 4 55 t o 4 65 K H z ( c ) 1 2 to 1 3 K H ( d ) 7 40 t o 8 40 K H z

1 2. I n a s u p e r h e t e r o d yn e r e c e i ve r a m p l i fi c a ti o n o f th e s i g n al af t e r c onve r te r i s d o n e at ( a) A ny f r e q u e n c y ( b ) O n l y I F ( c ) h i g h e r t h an s i gn a l f re qu e n c y ( d ) s i g n al f r e q u e n c y

1 3. S e l e c ti v i ty of a r e c e i ve r i s d e p e n d e nt on ( a) m i x e r a n d I F ( b ) I F am p l i fi e r ( c ) R F & M i x e r ( d ) m i x e r

1 4. I n d i c a t e w h i ch on e o f t h e f ol l ow i n g b l o cks i s u s e d i n b ot h c om mu n i c a t i on re c e i ve r s a n d b r oa d c a s t r e c e i ve r s ( a) L i m i t e r ( b ) b e a t f r e q u e n c y os c i l l at o r ( c ) m i x e r ( d ) S q u e l ch

1 5. Fo r b e s t s e l e c t i vi ty s t a b i l i ty a n d fi d e l i ty, th e I F mu s t b e ( a) l ow ( b ) a rb i t r a ry ( c ) h i g h ( d ) m e d i u m

1 6. T h e c i r c u i t t h at r e d u c e s t h e g ai n of R F am p l i fi e rs w h e n th e i n p u t s i g n al i n c r e a s e s b e yo n d a p r e d e t e r m i n e d va l u e i s ( a) S i m p l e AVC ( b ) d i ff e r e nt i at i o n ( c ) d e l aye d AVC ( d ) C r y s t al fi l t e r

1 7. I n d i c a t e t h e f al s e s ta t e m e nt : I f t h e I nt e r m e d i a t e f r e q u e n c y i s h i g h ( a) t h e l o c a l o s c i l l a t or n e e d n o t b e h i gh l y s ta b l e ( b ) i m a ge f r e q u e n c y r e j e c t i on i s ve r y go o d ( c ) t ack i n g w i l l b e i m p r ove d ( d ) t h e s e l e c t i v i ty w i l l b e p o or

1 8. A ty p i c a l s q u e l ch c i rc u i t ( a) c u t s off t h e a u d i o am p l i fi e r w h e n t h e c ar r i e r i s b l o ck ( b ) c u t s off t h e I F am p l i fi e r w h e n t h e AG C i s m a xi mu m ( c ) c u t s off t h e I F am p l i fi e r w h e n t h e AG C i s m i n i mu m ( d ) e l i m i n a t e s t h e RF i nt e r f e re n c e w h e n t h e s i gn a l i s we ak

1 9. T h r e e p o i nt t r a cki n g i s a ch i e ve d w i t h ( a) d o u b l e s p ot t i n g ( b ) b l o ck i n g ( c ) Pa d d e r C a p ac i t o r ( d ) d o u b l e c o nve r s i o n

2 0. C o m p an d i n g i s u s e d ( a) I n P C M r e c e i ve r s t o re d u c e i m p u l s e n o i s e ( b ) To ove r c om e q u ant i z i n g n oi s e i n P C M ( c ) To i n c r e as e t h e p owe r c ont e nt of t h e m o d u l a te d s i g n al ( d ) To p ro t e c t s m a l l s i gn a l s i n P C M f r om Qu a nti s i n g n oi s e

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