Kenwood VS-1, PS-50, SP-430, PS-430, MB-430, AT-440, YK-88C, YK-88SN Circuit Descriptio N, Ipll

TS-440S

CIRCUIT DESCRIPTIO N

ANT

30 K

2nd MIX

3rd MI X

DET

30MHz

1st MIX

D

AF OU T

/

\ I

D

5 KHZ

I

6 .22MHZ

P

120KHZI

1= 1800 1=450 1

J=72441=1811 1

CA R

FM MOD I

I / 1

I I F M

AMR,FM R

: 455 KH z

1/1 0

AMT, FMT

IPLL 51

USB, CW

: 456. 5

HI

LSB, FSK

: 453 . 5

MIX 5

4 .55MH

IX 4

1/2 0

IPLL31

9.9—10 4MH

58.25-u

I/1 0

1/ 5

53.25MHz

91 MH z

AM,FM

: 91 MH z

BP F

64.78 =

I .98^-2.08MHz /'—1

USB,CW

: 91 .3 MH z

59 .88MHz

LSB,FSK

: 90 .7MHz

r

99=104MH z

(98_6 =103.6MHZ)

IPLL11

I /P o rI

—

IPLL4I

1 /P-

1

P.D

I p,D

I/ M

M=323 9

5KHZ

P .D

5KH z

I

AM,FM

: K=18200

F

} 20KH Z

299 4

)Cw R

STEP 5

USB, CW

K=1826 0

P D

I/N,I/A--L

1/450

Y I/L

11/1800

I/K

1/180 0

LSB,FSK

K=1814 0

L=19800

SOOKHZ

INT=13-.73

T _ MN614 7

`_

MN614 7

—

—

L—

1

—

MKR —

I/1 8

NT=PN-A I

I

20799

4

--- -

(=13720_ .20719)

11

7006 J

RIT, XI T

Fig . 2 PLL frequency configuratio n

As shown in figure 2, all received frequencies excluding th e local oscillator frequency fLo are generated in the PLL circuit . The frequencies generated in these loops are expressed a s follows:

VCO5 :	fvcos	4 fsTD				41		2
			I	fvcos	=		fSTD
	J
VC04:	fK04	4	-fsTD	. fvco4 = 7200 fSTD . . .				3
			800 •
VCO3 : fvLos =		4 .fsTD				L		4
			800	fvcos = 7200 fSTD . . . .
	fvcoz + fvco3 + fvco4				1	'fsTD
VCO2 :		50		20	4
			M		450
			M	fsTD	fvco	_s	fvco4	5
	fvcoz = 1800				50		20
	fvcos — fLo — fSTD + fvcoz					1	fsTD
						4
VC01 :				10
			N				1 8

:. fvcos = 72 fSTD + fLo + fSTD f102 . . 6

Based on these formulas, the frequencies fvcor fHET, and fCAR are expressed as follows :

fvco = fvcor =	/	N	M	L
	(	72	1800 + 3600000

		K		7
	+ 1440000 + 1) fsTD + fLo
	J	fSTD		8
fHET = fVCO5 = 41
fcAR	fvco4	K	fSTD	9
	200	1440000

Formula 1 may now be rewritten as follows :

N _	M	L	J
fIN 1 72	180000 + 3600000		41 + 1 ) . fsTD
			1	0

Note that f Lo is not included in formula 10 . That is, a received frequency is determined by the reference frequen- cy fsTD and frequency division data Ito N. Further analysi s of formula 10 shows the following :

i)Basically, frequency division data I to N contain no er- ror because they are controlled by the microproces- sor according to the operating frequency .

ii)The accuracy of the operating frequency is equal t o that of the reference frequency, because all frequen- cies other than fsTD in formula 10 are determine d by the microprocessor .

iii)The operating frequency does not change even if k o r fLo changes .

When fIN = 14 MHz (USB mode) in formula 10 , fIN and fSTD have the following relationship :

5