Alinco DR-610T User manual

«
DR-61 OT/E Service Manual
CONTENTS
• SPECIFICATIONS
1 ) General...........................................2
2) Transmtter........................................2
3) Recever...........................................2
• CIRCUIT DESCRIPTION
1 ) Recever System..............................3 - 8
2) Transmtter System ............................... 9
3) PLL Crcut ................................. .10-11
4) Front CPU and Perpheral Crcut ........ 11 ~ 12
5) Sub CPU and Perpheral Crcut .......... .12 ~ 13
6) CTCSS Tone Encoder Crcut .................. 13
7) Packet Crcut .................................... 14
8) Front CPU I/O Port (IC501 )................15-16
9) Man CPU I/O Port (IC601) ............... 17 ~ 18
• SEMICONDUCTOR DATA
1) AN8010M ........................................ 19
2) BU4094BF ........................................19
3) L78LR05D.......................................20
4) LA4445...........................................20
5) M56760FP.......................................21
6) M57788MR ...................................... 22
7) MC7808..........................................23
8) NJM4066B .......................................23
9) NJM2902M (T1).................................23
10) NJM4558 ........................................ 24
11 ) RH5VA60AA .....................................24
12) nPC1676G.......................................24
13) S-AV17...........................................25
14) TC4S11F ........................................ 26
15) TC4S66F ........................................ 26
16) TC4W53F........................................26
17) TC9154AP ....................................... 27
18) TC95219F .......................................28
19) TC35305F (TP1).................................29
20) TK10489M.......................................30
21) TK10930VTL .................................... 31
22) Transstor, Dode and LED Outlne Drawngs... 32
23) LCD ....................................... 33-34
• EXPLODED VIEW
1 ) Front Vew .......................................35
2) LCD Vew ........................................ 35
3) VHF Unt Vew...................................36
4) UHF Unt Vew...................................37
Dv A L IN C O E L E C T R O N IC S IN C .
• PARTS LIST
VHF MAIN Unt ............................ 38-40
UHF MAIN Unt ............................. 40-42
VOL Unt..........................................42
FRONT CPU Unt .......................... 44-43
SUB CPU Unt ..............................50- 45
VHF VCO Unt....................................45
VHF PLL Unt .................................... 45
UHF VCO Unt....................................46
UHF PLL Unt...............................54 - 46
AIR Unt...........................................46
ENC Unt ......................................... 47
SP Unt ........................................... 47
FAN Unt ......................................... 47
Packet ............................................47
Mechancal Parts................................ 47
PCB...............................................47
Packng........................................... 47
EHM35B..........................................47
EHM39........................................... 48
• ADJUSTMENT
1) Requred Test Equpment.......................49
2) Adjustment Ponts..........................50 — 51
3) UHF RX Adjustment.............................52
4) UHF TX Adjustment.............................53
5) VHF RX Adjustment.............................54
6) VHF TX Adjustment ............................. 55
• PC BOARD VIEW
1) VHF MAIN/AIR Unt Sde A ..................... 56
2) VHF MAIN/AIR Unt Sde B ..................... 57
3) UHF MAIN/ENC/VOL Unt Sde A .............. 58
4) UHF MAIN/ENC/VOL Unt Sde B .............. 59
5) Front CPU Unt Sde A .......................... 60
6) Front CPU Unt Sde B .......................... 60
7) SUB CPU Unt Sde A ........................... 61
8) SUB CPU Unt Sde B ........................... 61
9) VHF VCO Unt ...................................62
10) VHF PLL Unt....................................62
11) UHF VCO Unt...................................62
12) UHF PLL Unt....................................62
• BLOCK DIAGRAM
1) Man Block Dagram ............................. 63
2) CPU Block Dagram ............................. 64
3) PLL Block Dagram .............................. 65
• SCHEMATIC DIAGRAM
1) VHF MAIN UNIT ........................... 66-67
2) UHF MAIN UNIT ........................... 68-69
3) FRONT CPU UNIT..............................70
4) SUB CPU Unt ................................... 71
5) VHF VCO, PLL Unt ............................. 72
6) UHF VCO, PLL Unt ............................. 73
7) ENC Unt ......................................... 74
8) EHM35B ......................................... 75
9) EHM39................ . ...........................75
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S P E C IF IC A T IO N S
1) General
Frequency Coverage:
Channel steps:
Antenna Impedance:
Microphone Impedance:
Speaker Impedance:
Supply oltage:
Dimensions (Body only):
Weight:
( ersion T)
HF BAND
UHF BAND
( ersion E)
HF BAND
108.000 ~ 173.995MHz
420.000 ~ 470.000MHz
144.000 ~ 147.995MHz
138.000- 173.995MHz
420.000 ~ 470.000MHz
438.000 ~ 449.995MHz
144.000 ~ 145.995MHz
430.000 ~ 439.995MHz
UHF BAND 144.000 ~ 145.995MHz
430.000 ~ 439.995MHz
5, 10, 12.5, 15, 20, 25, 30, 50kHz steps
50Q unbalanced
2kQ unbalanced
8Q unbalanced
13.8 olts DC
140mm(W) x 40mm(H) x 162mm(D)
1.1kg (approx.)
(RX)
(RX)
(TX)
(RX)
(RX)
(TX)
(RX/TX)
(RX)
(RX)
(RX/TX)
2) Transm tter
Output Power:
Emission Mode:
Modulation System:
Max. Frequency Deviation:
Spurious Emission:
HF BAND
UHF BAND
F3E (FM), F2E (F2)
Reactance Modulation
+/ -5kHz
not more than -60dB
High: 50W / Mid: 10W/Low: 5W (approx.)
High: 35W / Mid: 10W / Low: 5W (approx.)
3) Rece ver
Modulation Mode:
Receiving System:
Intermediate Frequency:
Sensitivity (12dB SINAD):
Selectivity:
AF Output:
F3E (FM), A3E (AM)
Double Superheterodyne
\ /1 i r n a k r\
v n r d m in u
UHF BAND First: 58.3MHz / Second: 455kHz
Main band: -16dBp. or better, Sub band: -13dBji or better
-6dB: 12kHz or more, -60dB: 28kHz or less
2.5W or more (5% distortion)
Specifications are subject to change without notice or obligation.
Specifications guaranteed in the amateur band only.
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C IR C U I T D E S C R IP T IO N
1. Rece ver System
1) Rece ver S gnal C rcu t
w
D7, D8
HF
T h e r e c e iv e r s ig n a l f r o m t h e a n t e n n a is p a s s e d t h r o u g h t h e d u p l e x e r , t h e c i r c u i t
c o n s is t i n g o f H F : L o w - p a s s f il t e r a n d U H F : h i g h - p a s s f ilt e r , a n d t h e s i g n a l is
d iv i d e d i n t o H F a n d U H F .
06
AN T RF
s w AM P
UHF
D303, D304 Q310
FL1
455kHz
AN T _ J RF RF
SW * AM P AM P
144M Band Rece ver C rcu t
T h e r e c e iv e r s i g n a l p a s s e d t h r o u g h t h e d u p le x e r is l e d t o t h e a n t e n n a s w it c h ( D 7 ,
D 8 ) . A f t e r p a s s i n g t h r o u g h t h e h i g h - p a s s f il te r , t h e s i g n a l i s a m p l if ie d b y R F
a m p l if ie r , . Q 6 . T h e a m p l if ie d s ig n a l is a m p lif ie d a g a i n b y R F a m p l i f i e r Q 7 , t h e n t h e
u n w a n t e d s i g n a l w ill b e e lim i n a t e d b y t h e v a r i c a p t u n e d t r i p le b a n d - p a s s f il t e r .
S e c o n d l y t h e s ig n a l is m i x e d w i th t h e s ig n a l f r o m t h e f i r s t l o c a l o s c i lla t o r in t h e f ir s t
m ix e r Q 8 , t h e n c o n v e r t e d i n t o t h e f ir s t I F . It s u n w a n t e d s i g n a l is a t t e n u a t e d in t h e
c r y s t a l f i lt e r c i r c u i t. A f t e r a m p lif ie d b y I F a m p lif ie r Q 2 5 , t h e s ig n a l i s le d t o I C 2
P i n 2 4 .
T h e s i g n a l i s m i x e d w it h t h e s ig n a i f r o m t h e s e c o n d io c a i o s c i l l a t o r in I C 2 , t h e n
c o n v e r t e d i n t o t h e s e c o n d IF , a n d o u t p u t f r o m P i n 3 . T h e o u t p u t s ig n a l is in p u t to
t h e I C 2 P i n 7 a g a i n a f t e r u n w a n t e d s i g n a l is a t t e n u a t e d b y t h e c e r a m i c f il t e r . T h e
s i g n a l i s le d t o t h e l im i t e r a m p lif ie r I C 2 , a n d d e m o d u la t e d b y q u a d r a t u r e c i r c u it in
I C 2 , t h e n t h e s ig n a l is o u t p u t f r o m P in 1 2 a s t h e A F s i g n a l.
AIR Band Rece ver C rcu t
T h e r e c e iv e r s ig n a l p a s s e d t h r o u g h t h e d u p l e x e r is le d t o t h e a n t e n n a s w i t c h ( D 7 ,
D 8 ) . A f t e r p a s s i n g t h r o u g h t h e h i g h - p a s s f ilt e r , t h e s i g n a l is a m p lif ie d b y R F
a m p lif ie r Q 6 . T h e a m p l if i e d s ig n a l is l e d t o t h e b a n d - p a s s f ilt e r in A I R F r o n t U n it ,
a n d a m p li f ie d b y R F a m p l if i e r Q 9 0 1 , t h e n o u t p u t f r o m P in 9 .
S e c o n d l y t h e s i g n a l is m ix e d w it h t h e s i g n a l f r o m t h e f ir s t l o c a l o s c i ll a t o r in t h e f ir s t
3
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m ix e r Q 8 , t h e n c o n v e r t e d i n t o t h e f ir s t IF . I t s u n w a n t e d s ig n a l i s a t t e n u a t e d b y t h e
c r y s t a l f i lt e r c ir c u i t. A f t e r a m p lif ie d b y I F a m p l if i e r Q 2 5 , t h e s i g n a l i s l e d to I C 2 ,
P i n 2 4 .
T h e s ig n a l i s m i x e d w it h t h e s i g n a l f r o m t h e s e c o n d lo c a l o s c illa t o r in I C 2 , t h e n
c o n v e r t e d in t o t h e s e c o n d I F , a n d o u t p u t f r o m P in 3 . T h e o u t p u t s i g n a l is in p u t t o
t h e i C 2 P i n 5 a g a i n a f t e r u n w a n t e d s i g n a l is a t t e n u a t e d b y t h e c e r a m ic f ilt e r . T h e n
t h e s e c o n d I F i s d e m o d u la t e d b y A M d e t e c t o r o f I C 2 , a n d i s o u t p u t f r o m P in 1 3 a s
t h e A F s i g n a l.
430M Band Rece ver C rcu t
T h e r e c e iv e r s ig n a l p a s s e d t h r o u g h t h e d u p le x e r i s l e d t o t h e a n t e n n a s w i tc h
( D 3 0 3 , D 3 0 4 ) . T h e s ig n a l i s a m p l if i e d b y R F a m p l if ie r Q 3 0 1 . T h e a m p l if ie d s i g n a l
is a m p lif ie d a g a i n b y R F a m p lif ie r Q 3 1 1 a n d t h e u n w a n t e d f r e q u e n c y b a n d i s
e lim i n a t e d b y t h e h e l ic a l f i l te r L 3 2 2 , t h e n a m p lif ie d b y t h e R F a m p l if i e r Q 3 1 2 , a n d
a f t e r e l im i n a t in g t h e u n w a n t e d f r e q u e n c y b a n d b y t h e h e lic a l f il t e r L 3 2 3 , t h e s ig n a l
is m ix e d w i t h t h e s ig n a l f r o m t h e f ir s t lo c a l o s c i ll a t o r in t h e f i r s t m i x e r Q 3 1 3 , t h e n
c o n v e r t e d i n t o t h e f ir s t I F . Its u n w a n t e d s ig n a l is a t t e n u a t e d in t h e c r y s t a l f ilt e r
c ir c u i t. A f t e r a m p lif i e d b y IF a m p lif ie r Q 3 2 6 , t h e s ig n a l is le d t o I C 3 0 2 P i n 2 0 .
T h e s i g n a l i s m i x e d w i th t h e s i g n a l f r o m t h e s e c o n d lo c a l o s c il l a t o r in I C 3 0 2 , t h e n
c o n v e r t e d in t o t h e s e c o n d I F , a n d o u t p u t f r o m P i n 4 . T h e o u t p u t s ig n a l is i n p u t to
I C 3 0 2 P i n 6 a g a i n a f t e r u n w a n t e d s ig n a l i s a t t e n u a t e d b y t h e c e r a m ic f ilt e r . T h e
s i g n a l is l e d t o t h e l im it e r a m p l if i e r IC 3 G 2 , a n d d e m o d u l a t e d b y q u a d r a t u r e d e t e c 
t io n c i r c u i t , t h e n t h e s i g n a l is o u t p u t f r o m P in 1 1 a s t h e A F s ig n a l.
144M Band Sub Rece ver C rcu t
T h e r e c e i v e r s ig n a l f r o m t h e a n t e n n a is l e d t o t h e H F R e c e i v e r . A f t e r a m p li f ie d
b y R F a m p l if i e r Q 6 , t h e s i g n a l is in p u t t o t h e H F S u b R e c e i v e r . P a s s i n g t h r o u g h
t h e h i g h - p a s s f ilt e r t o a t t e n u a t e t h e u n w a n t e d s ig n a l , t h e s i g n a l is a m p l if ie d b y R F
a m p l if ie r Q 3 1 5 . T h e a m p lif ie d s ig n a l i s l e d t o t h e b a n d - p a s s f il t e r t o a t t e n u a t e t h e
u n w a n t e d s i g n a l, t h e n m i x e d w i th t h e o s c illa t i n g f r e q u e n c y f r o m U s u b - C O in
t h e f i r s t m ix e r Q 3 1 6 , a n d c o n v e r t e d t o t h e f ir s t I F o f U H F . T h e f i r s t I F is l e d t o
I C 3 0 2 .
430M Band Sub Rece ver C rcu t
T h e r e c e iv e r s i g n a l f r o m t h e a n t e n n a is le d t o t h e U H F R e c e i v e r . A f t e r a m p lif ie d
b y R F a m p lif ie r Q 3 1 0 , t h e s ig n a l is i n p u t t o t h e U H F S u b R e c e iv e r . T h e s ig n a l is
a m p l if i e d a g a i n b y t h e R F a m p l if ie r I C 1 0 a n d le d t o t h e b a n d - p a s s f ilt e r t o a t t e n u 
a t e t h e u n w a n t e d s i g n a l . T h e n t h e s i g n a l is m i x e d w i th t h e o s c i ll a t in g f r e q u e n c y
f r o m s u b U - C O in t h e f ir s t m i x e r Q 1 0 , a n d c o n v e r t e d t o t h e f ir s t I F o f H F . T h e
f ir s t IF is le d t o I C 2 .
S (S gnal) Meter C rcu t
VHF:
T h e S m e t e r s ig n a l, D C v o l t a g e o f IC 2 P in 1 6 is p a s s e d t h r o u g h v a r i a b l e r e g is t e r
R 5 . A f t e r a d d e d t o I C 6 0 1 P in 3 4 , t h e s i g n a l is d i g i t iz e d b y A D c o n v e r t e r a n d
in d ic a t e d o n L C D a s t h e S m e t e r .
UHF:
T h e S m e t e r s i g n a l, D C v o lt a g e o f IC 3 0 2 P in 1 2 is p a s s e d t h r o u g h v a r i a b l e r e g i s t e r
R 3 0 4 . A f t e r a d d e d t o IC 6 0 1 P i n 3 1 , t h e s ig n a l is d i g it iz e d b y A D c o n v e r t e r a n d
in d ic a t e d o n L C D a s t h e S m e t e r .
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RF Attenuator Circuit
W h e n t h e A T T k e y is p u s h e d , " H " is o u t p u t f r o m t h e S h i f t R e g is t e r IC 7 P in 1 4 , t h e n
Q 1 6 is t u r n e d O N t o w o r k t h e R F A t t e n u a t o r C i r c u i t c o n s i s t i n g o f D 2 , D 3 a n d D 4 .
T h e i n p u t s i g n a l p a s s e d t h r o u g h t h e D u p le x e r , L o w - p a s s f i lt e r a n d A n t e n n a s w it c h ,
is a t t e n u a t e d a b o u t 1 5 d B b y R F a t t e n u a t o r b e f o r e i n p u t to Q 6 t o d e c r e a s e th e
in t e r f e r e n c e .
UHF:
W h e n t h e A T T k e y is p u s h e d , " H " is o u t p u t f r o m t h e S h if t R e g i s t e r I C 3 0 5 P in 1 1 ,
t h e n Q 3 2 1 a n d Q 3 1 8 a r e t u r n e d O N t o w o r k t h e R F A t t e n u a t o r C i r c u i t c o n s i s t in g o f
D 3 0 3 a n d D 3 1 3 . T h e i n p u t s i g n a l p a s s e d t h r o u g h t h e D u p le x e r , L o w - p a s s f il t e r
a n d A n t e n n a s w it c h , is a t t e n u a t e d a b o u t 1 5 d B b y R F a t t e n u a t o r b e f o r e i n p u t t o
Q 3 1 0 t o d e c r e a s e th e in t e r f e r e n c e .
AGC (Auto Ga n Control) C rcu t
W h e n t h e in p u t s i g n a l is i n c r e a s e d w h i le r e c e i v i n g A M , t h e A G C c i r c u i t c o n s i s t in g
o f Q 2 4 i n c r e a s e s t h e b i a s c u r r e n t a c c o r d i n g t o t h e c lim b o f t h e D C v o lt a g e f r o m
I C 2 P in 1 6 t o d e c r e a s e t h e p o w e r g a i n . ( F o r w a r d A G C )
2) Squelch C rcu t
VHF:
T h e A F s ig n a l o u t p u t fr o m I C 2 P i n 1 2 is i n p u t to P in 1 9 . O n l y t h e n o i s e is a m p l if ie d
b y t h e a c t iv e f ilt e r in ! C 2 , a n d o u t p u t f r o m P in 2 Q , t h e n a m p l if ie d b y t h e N o is e
a m p l if ie r Q 2 7 . T h e a m p l if i e d n o is e i s r e c t i f ie d t o D C v o lt a g e b y D 2 0 a n d i n p u t to
P i n 2 1 . T h e in p u t v o l t a g e is d e t e r m in e d b y t h e a n a l o g u e s w i t c h I C 9 d e p e n d i n g o n
t h e p o s it io n o f t h e S q u e l c h v 'R .
In c a s e t h a t S q u e lc h R i s s e t t o M I N , a ll o f t h e a n a lo g u e s w i t c h e s i n I C 9 a r e
t u r n e d O N , a n d t h e v o l t a g e o f P in 2 1 d e c r e a s e s . S e c o n d l y t h e v o lt a g e s a r e
c o m p a r e d in I C 2 . T h e s q u e l c h s ig n a l ( S D ) f r o m P in 2 1 b e c o m e s " L " a n d t h e
s q u e lc h o p e n s .
In c a s e t h a t S q u e lc h R is s e t t o M A X , a l l o f t h e a n a l o g u e s w i t c h e s in IC 9 a r e
t u r n e d O F F , a n d t h e v o l t a g e o f P in 2 1 in c r e a s e s . S e c o n d ly t h e v o l t a g e s a r e
c o m p a r e d in I C 2 , t h e S q u e l c h s i g n a l ( S D ) f r o m P in 2 1 b e c o m e s " H " , a n d t h e
s q u e l c h c l o s e s . IC 8
Q 5 Q 6 Q 7 Q 8
HF:
T h e A F s ig n a l o u t p u t f r o m I C 3 0 2 P i n 1 1 is in p u t to P in 1 3 . O n ly t h e n o is e is a m p li
f ie d b y t h e a c t i v e f ilt e r in I C 2 , a n d o u t p u t f r o m P in 1 4 , t h e n a m p lif ie d b y t h e N o i s e
a m p lif ie r Q 3 2 5 . T h e a m p lif ie d n o is e i s r e c t if i e d t o D C v o lt a g e b y D 3 1 5 a n d i n p u t t o
P in 1 5 . T h e v o lt a g e is d e t e r m in e d b y t h e a n a l o g u e s w i tc h I C 3 0 3 d e p e n d i n g o n t h e
p o s it io n o f t h e S q u e l c h R .
In c a s e t h a t S q u e l c h R is s e t to M I N , a ll o f t h e a n a lo g u e s w i tc h e s a r e t u r n e d O N ,
a n d t h e v o l t a g e o f P i n 1 5 d e c r e a s e s . S e c o n d l y t h e v o lt a g e s a r e c o m p a r e d in I C 2 .
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T h e S q u e lc h s ig n a l ( S D ) f r o m P i n 1 6 b e c o m e s " L " a n d t h e s q u e lc h o p e n s .
In c a s e t h a t S q u e l c h R is s e t t o M A X , a ll o f t h e a n a l o g u e s w it c h e s in I C 9 a r e
t u r n e d O F F , a n d t h e v o lt a g e o f P i n 1 5 in c r e a s e s . S e c o n d l y t h e v o l ta g e a r e c o m 
p a r e d in I C 2 , t h e S q u e lc h s i g n a l ( S D ) f r o m P in 2 1 b e c o m e s " H " , a n d t h e s q u e l c h
c l o s e s . IC 3 0 4
Q5 Q6 Q7 Q8
3) Power Supply C rcu t
VHF Power Supply Sw tch C rcu t and Unlock C rcu t
In t h e r e c e iv i n g m o d e , " H " is o u t p u t f r o m P in 4 o f S h i f t R e g is t e r I C 8 a c c o r d i n g t o
t h e s e r i a l d a t a f r o m C P U , a n d Q 3 0 a n d Q 2 9 a r e t u r n e d O N , t h e n 8 is a d d e d t o
8 R l in e .
In t h e t r a n s m i tt in g m o d e , ju s t s a m e a s r e c e iv in g , " H " i s o u t p u t f r o m P in 5 o f I C 8 ,
a n d Q 3 2 a n d Q 3 1 a r e t u r n e d O N , t h e n 8 is a d d e d to 8 T li n e .
W h e n P L L is u n l o c k e d , t h e u n lo c k s w i tc h Q 3 8 i s t u r n e d O N b e c a u s e " H " is o u t p u t
f r o m P L L - C O u n i t U L t e r m i n a l . T h e n 8 T s w i t c h 0 3 2 is t u r n e d O F F .
A c c o r d i n g l y t h e t r a n s m i t tin g i s e n a b l e w h e n P L L i s u n l o c k e d b e c a u s e 8 T l in e
d o e s n o t w o r k .
UHF Power Supply Sw tch C rcu t and Unlock C rcu t
In t h e r e c e i v in g m o d e , " H " is o u t p u t f r o m P in 4 o f S h i f t R e g is t e r I C 3 0 4 a c c o r d i n g to
t h e s e r i a l d a t a f r o m C P U , a n d 0 3 3 2 a n d 0 3 3 0 a r e t u r n e d O N , t h e n 8 i s a d d e d t o
8 R l in e .
W h e n t r a n s m i t t in g t h e s i g n a l , j u s t s a m e a s r e c e i v i n g , " H " is o u t p u t f r o m P in 5 o f
I C 3 0 4 , a n d 0 3 3 3 a n d 0 3 3 1 a r e t u r n e d O N , t h e n 8 is a d d e d t o 8 T li n e .
T h e U n lo c k S w it c h 0 3 3 4 is t u r n e d O N w h e n P L L is u n l o c k e d , b e c a u s e " H " is
o u t p u t f r o m P L L - C O u n i t U L t e r m i n a l, a n d 8 T S w i t c h 0 3 3 3 is t u r n e d O F F .
A c c o r d i n g ly t h e t r a n s m i tt in g is e n a b l e w h e n P L L is u n lo c k e d b e c a u s e 8 T lin e
d o e s n o t w o r k .
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A F S ig n a l C irc u it
VHF FM:
T h e A F s ig n a l o u t p u t f r o m I F u n i t I C 2 P in 1 2 is m a d e t h e A F f r e q u e n c y c h a r a c t e r i s 
t ic s 3 k H z o r b e l o w b y t h e d e - e m p h a s is c i r c u i t ( c o n s i s t in g o f R 1 1 2 , C 1 6 5 , R 1 2 8 ,
C 1 7 0 , R 1 7 1 a n d C 1 7 1 ) , t h e n a m p lif i e d b y A F p r e a m p lif ie r Q 3 5 .
T h e a m p l if ie d s i g n a l is m a d e t h e A F f r e q u e n c y c h a r a c t e r i s t ic s 3 0 0 H z o r m o r e b y
t h e d e - e m p h a s is c i r c u it ( c o n s is t in g o f Q 3 7 , R 1 3 8 , C 1 7 4 , R 1 3 9 a n d C 1 7 5 ) .
T h e d e - e m p h a s i z e d A F s i g n a l R O is m u t e d in t h e s u b c o n t r o l u n i t, a n d a f t e r t h e
s i g n a l is a d ju s t e d b y e l e c t r o n ic v o l u m e 1C 6 0 5 , a d d e d t o A F p o w e r a m p l if i e r I C 3
P i n 2 a s A O t o d r i v e t h e s p e a k e r , t h e n t h e s i g n a l is a m p l if ie d .
VHF AM:
T h e A F s ig n a l o u t p u t f r o m I F u n i t I C 3 0 2 , P in 1 3 is m a d e t h e A F f r e q u e n c y c h a r a c 
t e r i s t ic s 3 k H z o r b e l o w b y t h e d e - e m p h a s i s c ir c u i t ( c o n s is t in g o f R 1 1 0 , C 1 6 3 ,
R 1 1 1 , C 2 2 9 a n d C 1 6 4 ) , a n d a m p l if ie d b y t h e A M a m p lif ie r Q 3 4 .
T h e n t h e s i g n a l is p r o c e s s e d ju s t s a m e a s t h e F M .
UHF:
T h e A F s ig n a l o u t p u t f r o m I F u n it I C 3 0 2 , P i n 1 1 is m a d e t h e A F f r e q u e n c y c h a r a c 
t e r i s t ic s 3 k H z o r b e lo w b y t h e d e - e m p h a s i s c i r c u i t ( c o n s i s t in g o f R 3 9 2 , C 4 3 3 ,
R 4 0 6 , C 4 4 9 , R 4 1 3 a n d C 4 4 8 ) , t h e n a m p lif i e d b y A F p r e a m p l i fi e r Q 3 2 8 .
T h e a m p l if ie d s i g n a l i s m a d e t h e A F f r e q u e n c y c h a r a c t e r i s t i c s 3 0 0 H z o r m o r e b y
t h e d e - e m p h a s i s c i r c u i t ( c o n s is t in g o f Q 3 2 9 , R 4 0 9 , C 4 5 1 , R 4 1 2 a n d C 4 5 2 ) .
T h e d e - e m p h a s i z e d A F s i g n a l R O U is m u t e d b y t h e s u b c o n t r o l u n it , a n d a f t e r th e
s i g n a l is a d j u s t e d b y e le c t r o n ic v o l u m e IC 6 0 5 , a d d e d t o A F p o w e r a m p lif ie r IC 3
P i n 5 a s A O U t o d r i v e t h e s p e a k e r , t h e n t h e s i g n a l is a m p l if i e d .
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AF Mute Circuit
W h e n t h e s q u e l c h is c lo s e d d u r in g n o s ig n a l , t w o m u t e s w it c h e s Q 6 1 3 a n d Q 6 1 6
a r e t u r n e d O N b y t h e s ig n a l f r o m I C 6 0 1 P i n 5 0 , t h e n t h e v o i c e o u t p u t is m u t e d .
UHF:
W h e n t h e s q u e l c h is c l o s e d d u r i n g n o s i g n a l t w o m u t e s w i t c h e s Q 6 1 4 a n d Q 6 1 7
a r e tu r n e d O N b y t h e s ig n a l f r o m IC 6 0 1 P i n 4 9 , t h e n t h e v o i c e o u t p u t is m u t e d .
Electron c Volume C rcu t
VHF:
T h e m u t e d A F s i g n a l R O i s a d d e d t o t h e e le c t r o n i c v o lu m e I C 6 0 5 P in 3 . T h e
a d d e d s i g n a l is a t t e n u a t e d i n l O d B s t e p s f r o m 0 t o - 6 0 d B . T h e r e a r e 7 s t e p s f r o m 0
t o - 6 0 u B t o a t t e n u a t e t h e s i g n a l. T h e s i g n a i i s o u t p u t f r o m P i n 2 . T h e o u t p u t s i g n a l
is a m p l if i e d b y t h e a m p lif ie r Q 6 0 1 a n d a d d e d t o I C 6 0 5 P in 5 a g a i n . T h e s i g n a l is
a t t e n u a t e d i n 2 d B s t e p s . T h e r e a r e 5 s t e p s f r o m 0 t o 8 d B t o a t t e n u a t e t h e s ig n a l.
T h e s ig n a l is o u t p u t f r o m P in 6 .
T h e a t t e n u a t i o n l e v e l i s c o n t r o l le d b y t h e s e r ia l d a t a f r o m C P U I C 6 0 1 a f t e r t h e
R 5 0 2 r e g i s t e r v a l u e is c h a n g e d t o t h e v o l t a g e a n d c o n v e r t e d t o A / D .
UHF:
T h e m u t e d A F s i g n a l R O U is a d d e d t o t h e e l e c t r o n ic v o l u m e I C 6 0 5 P i n 1 4 . T h e
a d d e d s i g n a l is a t t e n u a t e d in 1 O d B s t e p s f r o m 0 t o - 6 0 d B . T h e r e a r e 7 s t e p s f r o m 0
t o - 6 0 d B t o a t t e n u a t e t h e s ig n a l. T h e s i g n a l is o u t p u t f r o m P in 1 5 . T h e o u t p u t
s ig n a l is a m p l if ie d b y t h e a m p l if i e r Q 6 0 2 a n d a d d e d t o I C 6 0 5 P i n 1 2 a g a i n . T h e
s ig n a l is a t t e n u a t e d in 2 d B s t e p s . T h e r e a r e 5 s t e p s f r o m 0 t o 8 d B t o a t t e n u a t e t h e
s ig n a l. T h e s i g n a l is o u t p u t f r o m P i n 1 1 .
T h e a t t e n u a t io n le v e l i s c o n t r o l le d b y t h e s e r i a l d a t a f r o m C P U I C 6 0 1 a f t e r t h e
v a l u e o f R 5 0 1 r e g i s t e r i s c h a n g e d t o t h e v o l t a g e a n d c o n v e r t e d t o A / D .
Speaker Output Sw tch ng C rcu t
T h e A F s ig n a l s , A O ( H F ) a n d A O U ( U H F ) a r e p a s s e d t h r o u g h t h e a n a l o g u e
s w i tc h I C 5 , a n d m ix e d . T h e s i g n a l is a d d e d t o t h e a u d io p o w e r a m p lif ie r I C 3 P in 5 ,
t h e n a m p lif ie d . In t h i s t im e , t h e v o i c e s o f H F a n d U H F b a n d s a r e o u t p u t f r o m t h e
s p e a k e r s im u l t a n e o u s l y .
HF:
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2. Transm tter System
1) Modulator C rcu t VHF/UHF
A f t e r t h e v o i c e is c o n v e r t e d in t o t h e e l e c t r ic s i g n a l b y t h e m ic r o p h o n e , t h e s i g n a l is
le d t o t h e m ic r o p h o n e a m p lif ie r I C 5 0 4 . I C 5 0 4 c o n s i s t s o f t w o o p e r a t i o n a l a m p l if i 
e r s i n c l u d in g t h e p r e - e m p h a s is c ir c u i t.
T h e a m p l if ie d v o i c e s ig n a l i s a d d e d t o t h e I D C c i r c u i t o f o p e r a t i o n a l a m p lif ie r .
T h e f r e q u e n c y d e v ia t i o n c a n b e a d j u s t e d in R 3 ( H F ) , o r R 3 0 5 ( U H F ) . T h e
s ig n a l is a d d e d t o C O v a r i c a p f o r r e a c t a n c e m o d u l a t io n o f H F / U H F .
2) Dr ve/PA Ampl f er C rcu t
VHF
T h e t r a n s m i t t in g s ig n a l f r o m C O o f H F b a n d i s ’ a m p l if i e d b y t h e y o u n g e r a m p l if i 
e r s Q 1 a n d Q 2 , t h e n i n p u t t o t h e p o w e r m o d u l e I C 1 . T h e t r a n s m i t t in g s i g n a l
a m p l if i e d t o t h e d e s ir e d le v e l in I C 1 , is p a s s e d t h r o u g h t h e l o w - p a s s f ilt e r , a n t e n n a
s w it c h , a n d h ig h - p a s s f i lt e r in t h e d u p l e x e r t o a t t e n u a t e t h e s e c o n d a n d t h ir d
h a r m o n i c s e n o u g h , t h e n s u p p l ie d t o t h e a n t e n n a .
UHF:
T h e t r a n s m it t in g s ig n a l f r o m C O o f U H F b a n d is a m p l if ie d b y t h e y o u n g e r a m p l i fi
e r s Q 3 0 1 , Q 3 0 2 a n d Q 3 0 3 , t h e n in p u t t o t h e p o w e r m o d u l e I C 3 0 1 . T h e t r a n s m i t 
t in g s i g n a l a m p lif ie d t o t h e d e s i r e d le v e l in IC 3 0 1 is p a s s e d t h r o u g h t h e lo w - p a s s
f il te r , a n t e n n a s w i t c h , a n d h i g h - p a s s f i lt e r in t h e d u p l e x e r t o a t t e n u a t e t h e s e c o n d
a n d t h ir d h a r m o n i c s e n o u g h , t h e n s u p p lie d t o t h e a n t e n n a .
3) APC C rcu t
VHF:
A p a r t o f t r a n s m i t tin g p o w e r f r o m l o w - p a s s f ilt e r i s d e t e c t e d b y D i o d e s D 1 a n d D 2 ,
I ts d e t e c t io n v o lt a g e is p a s s e d t h r o u g h t h e A P C c i r c u i t o f U H F ( Q 3 0 7 , Q 3 0 8 a n d
Q 3 0 9 ) a n d c o n t r o l s t h e A P C v o l t a g e s u p p lie d t o t h e y o u n g e r a m p l if ie r Q 1 o f H F
a n d t h e p o w e r m o d u l e IC 1 to fix t h e o u t p u t p o w e r .
UHF:
A p a r t o f t r a n s m i tt in g p o w e r f r o m l o w - p a s s f i lt e r is d e t e c t e d b y D io d e D 3 0 1 a n d
D 3 0 2 . Its d e t e c t i o n v o l t a g e is p a s s e d t h r o u g h t h e A P C c ir c u i t o f U H F ( Q 3 0 7 ,
Q 3 0 8 a n d Q 3 0 9 ) a n d c o n t r o ls t h e A P C v o lt a g e s u p p li e d t o t h e y o u n g e r a m p l if ie r
Q 3 0 1 o f H F a n d t h e p o w e r m o d u l e I C 3 0 1 t o f ix t h e o u t p u t p o w e r .
4) A r-Cooled Fun Power Control C rcu t
T h e a i r - c o o l e d f u n is b u ilt - i n t o c o o l t h e h e a t s i n k . W h e n t h e P T T is t u r n e d O N ,
Q 3 3 5 is a ls o t u r n e d O N s im u l t a n e o u s l y . T h e n t h e f u n t u r n s a t a h i g h s p e e d .
W h e n t h e P T T is t u r n e d O F F , " H " is o u t p u t f r o m I C 3 0 4 P in 7 , Q 3 3 5 is t u r n e d O N ,
t h e n t h e f u n t u r n s a t a lo w s p e e d .
T h e t e m p e r a t u r e s w it c h T S 1 i s i n s t a l le d . W h e n t h e t e m p e r a t u r e in t h e u n i t g o e s
u p o v e r 9 5 ° C , t h e t h e r m a l r e la y o p e n s , a n d Q 4 0 is t u r n e d O N . A ls o Q 4 ( H F ) a n d
Q 3 0 5 ( U H F ) a r e t u r n e d O F F , a n d t h e u n i t is s e t t o lo w - p o w e r e v e n w h i l e t r a n s m it 
t in g a t H I o r M I D p o w e r .
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1) PLL Synthes zer C rcu t
H F a n d U H F b a n d s h a v e t h e ir o w n u n it s is o l a t e d ly . T h e s u b u n it h a s t h e d u a l
c o n s t r u c t io n c o n s is t i n g o f C O in t h e u p p e r p l a c e a n d P L L in t h e l o w e r p la c e .
B o t h o f t h e s u b u n it s a r e p a c k e d in a h a r d s h ie ld c a s e s o a s n o t to b e in f lu e n c e d
b y t h e c ir c u m s t a n c e s .
T h e c r y s t a l X 1 o f 1 2 . 8 M H z is o s c i lla t e d in I C 7 5 1 ( H F ) , t h e o u t p u t i s l e d t o Q 2 2 ,
a n d t h e o u t p u t o f Q 2 2 is a d d e d t o I C 8 5 1 ( U H F ) .
T h e r e f e r e n c e o s c il l a t i n g f r e q u e n c y i s d i v i d e d in I C 7 5 1 a n d I C 8 5 1 t o g e t t h e
r e f e r e n c e f r e q u e n c y o f 5 k H z o r 6 . 2 5 k H z .
T h e c o m p a r i s o n f r e q u e n c y is d i v id e d b y t h e P L L o f p u l s e s w a l lo w s y s t e m , I C 7 5 1
a n d I C 8 5 1 a f t e r t h e C O o u t p u t is a m p lif ie d in Q 7 0 3 ( H F ) a n d Q 8 0 3 ( U H F ) . T h e
r e f e r e n c e f r e q u e n c y o f 5 , 1 0 , 1 2 . 5 , 1 5 , 2 0 , 2 5 , 3 0 , 5 0 k H z s t e p s c a n b e o b t a i n e d
b y d iv id in g X 1 .
3 . P L L C ir c u it
osc BUFF
144MHz PLL-VCO
B ockD agram
Q 7 5 5
THK3-
TXJ
RX
SC
2SK508K52
A 0802 n
2SC4215Y
UN5211 2SC4081
LNT SHIFT
' REGISTER
2SC3324B 2SK880 M56760FP ■*- 2SC4215Y
2SC4081 LNT*2 R R
0 8 5 1 . Q 8 5 2 , Q 8 5 3 IC 85 1 I $
B U F F
0 8 5 6
T
!
HKh 2SK508K52 2SC4215Y F UT
UN511L
Q855
430MHz PLL-VCO
B ockD agram
S H IF T
REG IS TE R
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