Kenwood TS 140 S Service Manual

Page 2

TS-14OS/68OS

CIRCUIT DESCRIPTION

Note; This text is concerned primarily with the TS-140.
those parts that pertain to the TS-GBO will be marked with

an asterisk i).

GENERAL

The T871410 l5 a transceiver incorporating a general
coverage receiver section utilizing double conversion princi-
ples with a first intermediate frequency (l l-) of 40 005 MHz

and a second IF of 455kHz.

The TS-140 covers all amateur bands lrom 1.9MH1 to
30MHZ (1,9 thru 50Mllzlt It contains a IOHZ step digital
PLL circuit using single crystal frequency management and

microprocessor control

stability.

The major functions are as follows:

to provide high accuracy and

0 Receiving section. General coverage from SOOkHz to 30

MHz ('SOOkl'lz to 3OMH2, and 50 to 54MH2)

0 Builtin woodpecker noise blanker (N82)

0 Frequency control function with a second subtcontrol
0 Frequency configured using a single reference oscillator
0 Range specified memory

FREQUENCY CONFIGURATION

The TS-tAO operates using a double conversion systl
for both transmit and receive (it operates using single c<
version in the FM transmit mode)

Figure 1 shows the frequency configuration of t
transmit and receive systems The receiver section will
covered first,

Assume that the input frequency from the antenna
le, the RX MIXl local input is iVCO, and the RX Ml.
local input is fHET. When the incoming signal is zero bl
the following relationships will hold true.

IN=IC°-7(Er-'Cnuuu.. ,,,,,,,,,,, ,
0 Covers all amateur bands lrorn 19 to 3OMH2 (1.9 to 54 i V N A C
MHZ
I . for VCO4, lvcoa ,Isro , 7i, .............. Q
0 Full CW break-in J BK " 0 8K 5'
O 28MHZ (SOMHzl band Preamplifier control
I Manual switching of AGC time constsn! for vco3 lvco; ism . L
t . . . - E, =87qu070 ..lvcm=fiabrsm » Q
C Busltrin variable threshold nonse blanker X »
for VC 2
O ' M-~ salmm ------ a
tin
FIX MIXI FIX Mlx2
77- , , , W a -- ,7 , -~~riri *7 ,, .weierasstyr 777777777777 IFfiDiErY , ~
«otossmuz RX
RX OUTPUT
TX if
DET
553 AM assxnzfix M
# TX
+ .
+ +
TX TX BM
Mixz MIX 1 W 55" 5er R
rm 559 X
cw l->
AM
rx
sse
cw FM AM rx
MIC INPUT
W50 1 NET 1cm
vco HET CAR
N \/
(FM MOD)
AM. FMR, CWNR :49: 33.6MH1 KEY INPUT AMP< FMR:
)(Lég, AMT..FMT:455KH1
m1 use. cww: n +1.5KHz
U58, CWWT " +1.5KH1 CWN 1 " +0-8KH1
cwwn .. +Ot7KH1 LSH H -1.5KH1
CWNT " +Ot8KHz
LSB .i _ t. SKHx

Fig 1 Signal system frequency configuration

Page 53

X New Parts

PA RTS L IST
Parts without Parts No. are not supplied.

Las articles non mentlonnes dans I6 Parts No. He sont pas fournIs.
Tens ohne Pans No. warden nlcht gellefert.

Address New Parts No. Description Dostl- Ra-
P-ru nation mark:
(11 I n I 15 I 5 I an =5 /!l. M 41!: 13W!
1111/111'1121111131 IZZYLND ' 11 . - " .1 1/1111
1111411 12119111 '1 . :1 r1 " .1 1/1111
' 1 .1 1/1111
.1 1/1111
.1 1/1111
.1 1/1111
.1' 1/1111
.1 1/1111
.1 1/1311
.1 1/1111
1141 1 1/1111
114,3 .1 1/1111
114:1 .. . .1 1/1111
1144 111141111 1111121 ~ . ' , 11 1/1111
114:1. 111141F'11;11(-.111.1 , A '- .1 1/1111
114/. 1111411 111.1111 , .1 1/1111
114 1 1111411 111111111 .1 1 /1.111
11411 1111411 . 111.1111 .1 1/1111
11411 111141111..1133:1.1 111111111 131111" 11 . 1 1/1111
115,11 11111111131111111 111.1111 1,1111 11 .1 1/1111
1111411 17111111 1.11113 11 .1 1/1111
11114 1.11.1111 [HIP 11 .1 1/1111
111.1111 1-11:- 11 ' .1 1/1111 3
KY ND 1.:1111) 1'1 .1 1/1111 2
111.1111 1:11112- 11. 1 .1 1/1111 1, a
.4
13111111 1'1-111-1 11 (11111 .1 1/1111 $54 5 :u 33
11111111 " ' ' .1 1/1111 .. 17; g (/1
1:11.111) .1 1/1111 0 o - 0 g
1:11.111) .1 1/1111 ES 53 § F?! o <
1.1111111 .1 1/1111 t A E o z 5
, . . . A 3 § S: m
1.111111 1311111 11 .1 1/1111 <1) .1: o 6 0 g
ITYIND 131-1113 11 .1 1/1111 0, J, P > .1 >
11114 1:Y1_N11 131-1111 1'1 .1 1/1111 m _. g r- " 2
111-151 11114 ITYLND 1:111? 11 1 .1 1/1111 0 3 t m C
1111-. 1111411 , _ 1111111 1111111 11 . .1 1/1111 E E x 5'3! 1:2
116'? 11114 11131.1 1.1111111 1:1»1111 11 .1 1/1111 g 0
111-111 111121 11112.1 '11 N11 1:11111 11 .1 1/1111 3
11611 11114 ILYLND 1111111 11 1 1/1111
11711 1111/1 311121 131111111 1.1111:- 11 1.111: .1 1/1111
111 1111411-11L1'11.a1.1 IYIND mm 11 (11111 .1 1/2111
111111 1111111 1.11111 11 11111 .1 1/1111
11111111 1111111 1:111 ' .1 1/1111
1111/1 11111111 1111111 11 1111' .1 1/1111
11114 1:Y1.N11 11111-1 11 11111 .1 1/1111
1111211111. 1.11110 1.11111 11 11111 .1 1/1111
I'YLND .1 1/1111
1:11.111) ' .1 1/1111
- .1 1/1111
.1 1/1111
1:11. NI) .1 1/1111
1111/1. 1.1 IiIYI, 1111 111111 11 :1311 .1' 1/1111
1111111111 11:11.1 1:11.111) 1" ' 11 1/1111
111141113 1.11.1 1:11.111) .1 1/1111
11114 71.1 1,,v1_1111 .1 1/811
11111.1 111111 3.2.1 13111111) 1 1/1111

E: SoundinaviMEumpe K:USA P: Canada 2 :13: :fiiM'T'W

U: PX(Fav East, Hawaii) T: England M: mharAms
fimAFEscuwoe) )CAustuliu A indicates safety critical components. 53