Kenwood TM-731A Service Manual page 9

CIRCUIT DESCRIPTION
TM-731A/E
MDI
as
tend
Sel
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ee eee esl
r-----
_ X57-3390°XX_
ee
|
Ppa] |= X88 25680-0_
s|
|
it
tt
qt
PLL
LPF
F.CONT
MOD
purr
| |
|
Id
ic | | | 21,02, 03
| DIO!,O102 |_| DIOS
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|
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FLR/LT SW |
1
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I
I
I 4
it
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|
1 |
tt
|
430~ '
|
|
| 439.995 MHz (M,W)
|
t
I
| 438 ~ 449.995 MHz (K) (P)
l
399.175~
1 |
I i 309.17 MHz (MW)
H
|
t (B/2)
J
416,400~ 428.395 MHz (K) (P}
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ee
SI
TITIIIIIIIT-
OUT!
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a
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PY
pu
LPF
y ! F.CONT
RXVCO
BUFF
4
1 | IC |
Q1,2 94
1 | DIO1,D1I02
1
-
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2Sc3324(8)}
| fy | iTs38c
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1b
ZN sw
sw tt
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I
Q5 |
1 |
DTCI44EK
1 [LJ D103,0104
1]
t |
| ISV 166
DIS
|
AMP
|
MOD
1
1
| |
DICI4EK
ISV268
|
Txvco suff If |
=
I |
j 7
ty
144~ 147.995 Miz (KM) (P)
ia
A
LA
[145.995 Me
.
Muz |
:
be
ie
X58 5860-0
Tx SO Size)
133.32 136.998 MEE (MWh
l K. Le
— MO(XS7-3610-00)
Fig. 12 PLL and VCO Block Diagram
f e oa P/N: -Lock~
~—— -—— - — - — - — - — - — -—
- - -~Q—-
—-}
i]
X= IN @8) osc |} —+{ 478 piv. F} 4 Ref. freq. divider | :
X-OUT @)
oe
est
L -
1 +4
Veo
FIN
2. Modulus
VA divider
Ref. freq, | fR PD
.
IN prescalor
b
(binary 7 bit!
select
det.
t
VREF
:
(1/128, 1/129)
_ if
|
B) PD
t
(/N Programmable divider
fin/ N
(Binary 10 bit) '
|
$2
$10
r?
1
|
21 bit data latch
6 cee
sw
421 > @) sw2
s1
>|
21 bit shift register |
@) Vee
aPS G
ol 21 puso counter |
Latch signal
@® GND
1 pluse counter
RST
Fig. 13 M54959 Pulse Swallow Control Circuit