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Transmitter Section
AF(1kHz) RF(145.99MHz)
IC16 Q9 Q10 Q11 Q12 ANTFILTER
MIC
MIC AMP vco
ANT
50
9.74Vrms 0.84Vrms -18.68dBm 10.50dBm 4.17dBm 15.17dBm 11.00dBm 24.67dBm 20.83dBm 30.50dBm
All voltage levels must be measured at High power transmission.
The RF and IF sections are measured by using a spectrum analyzer.
After setting the standard (1 kHz, 3 kHz Dev.) deviation, each voltage
of the AF section is measured by using an AF VTVM or osciloscope.
The level for each point is measured without removing parts or cutting
the pattern.
Receiver Section
RF(145.99MHz) IF(38.85MHz) AF(1kHz)
vco
-9.83dBm
LEVEL DIAGRAM
0.58Vrms
ANTFILTER Q17 Q16 IC3 IC6
ANT BPF BPF Q24 SP
FM IC AMP
-53.00dBm -62.50dBm -59.33dBm -47.83dBm -31.83dBm -35.83dBm -17.33dBm 0.26Vrms 12.09mVrms 0.66Vrms
All voltage levels must be measured after setting the AF output volt-
age at 0.58V rms.
The RF and IF sections are measured by using a spectrum analyzer.
Each voltage of the AF section is measured by using an AF VTVM or
osciloscope.
The level for each point is measured without removing parts or cutting
the pattern.
55
TH-K2AT/K2E/K2ET
TH-K2AT/K2E/K2ET
BLOCK DIAGRAM
VR6
TONE
DTMF/BEEP
VR5
IC5 IC16 D6
NJM2107F NJM2904V 1SV305
MOD
HPF LIMITTER AMP
SPLATTER Q1
FILTER 2SC5066
5C (O)
5T OSC
D1, D2
1SV325
5MV Q6
Q30 Q27
D74,D75 Q29 D22 D27
, , 2SC4617(R) 2SK1830 2SC5488
2SC4919
DA221 1SS361 VOX AMP WIDE/NARR RF AMP
RB706F-40
LIMITTER SW
MIC AGC
J3 Q3
PTTE/RXD D24 2SK1830
MA742
5MV NAR
MICM SHIFT SW
VOX DET
LPF LOOP
FILTER
SHIFT
D42,43,46 IC1
D44,47 LMX2316TMX 2nd Local
B30-2205-05
KEY ILLMI PLL IC TCXO 5MS Q23
KTC4082
X1
KIN0~3 12.8MHz
Q50 TRIPLER
2SK1830 VR1
KEY ILLMI 5C
SW
PLLEN
PLLLD
KYO0~3 CLOCK
DATA 5R
VR6
X57-674 B/3
VOXIN TONE NAR
SIGIN
VSS,DVSS,
AVSS,AVRL Q52
PTT RN1107
PTTI BSFT
KIN4 D48,49 Q51 BEAT SHIFT
B30-2205-05 IC8
RN4902
LAMP
LCD ILLMI LCD ILLMI
LAMP SW MPU
KYO1 X0
KYO2
X1
MONI
SEG0~31
X57-674 C/3 COM0~3
NOAA
BTEMP
DCDET
CLOCK
DATA VCC,DVCC
EEPCS INTUP AVCC,AVRH
LCD EEPDI INTDW RESET HST(VCC),V3
D/A H/L
DTMF/BEEP,TONE AFM,SPM,MICM, IC15 IC10 IC11 D40,41
KAPC,FINAL,CHARGE, AT25160N S-80844 S-80930 B30-2156-05
AFAMP,RXLED,BTDET,TXD 10SI27 CNNBB85 CNNBG80 B30-2157-05
PWM 5MS,5R,5T,5C(SAVE)
,VOX, 5C
EEPROM INT RESET
BPF/APC KYO0~3,VUKEY TX/RX LED
A/D H/L
REM,SQ,SM,BATT 5M
RXD,PTTE,PTTI,
ENCA,ENCB, Q47
PWRSW,KIN0~4,TYPE RN1701 5T
TX/BUSY
LED SW RXLED
X57-674 A/3
56
TH-K2AT/K2E/K2ET
BLOCK DIAGRAM
B
LPF
Q2 Q5 D8, D9 Q9 Q10 Q11 Q12 D10
2SC5488 2SC5488 HSC277 2SC5488 2SC4926YD 2SK2596 2SK3476 ANT
XB15A709
RF AMP RF AMP TX/RX SW RF AMP PRE-DRIVE DRIVE AMP FINAL AMP ANT SW
AMP
5R 5T
5C
Q14 D12,D13
Q4,D7 Q15 RN4902 HVC131
TH1 Q58
2SC4617(R) 2SK1830 ANT SW
B57331V APC SW
LIPPLE 2103J APC KILL SW
FILTER SW BIAS SW
TEMP DET
FINAL
Q13 IC2 D17
CF1 450kHz 2SK1830 NJM2904V HSM88AS
5C D14
5T
SW APC AMP MA2S111 ANT SW
5R
APC V BPF/APC
XF1 Q16
MCF 3SK318
IC3
38.4MHz TA31136FN D18,D19 Q17 D20,D21
Q24 1SV305 2SK1215 1SV305
2SC5488
FM IC IF AMP BPF RF AMP BPF
38.85MHz
5R
5R 5R BPF/APC 5R BPF/APC
SQ,SM
Q22 CD1 Q21 Q20 VR Q56 J4
LPF IC6
RN2105 2SC4617 2SK1830 TA7368F CPH3417
(R) D26
WIDE/NARR DE-EMPH AF FILTER AF MUTE SW AF AMP 1SS388
SW SP MUTE SW
REM
/TXD
DTMF/BEEP
IC17
NJM2902V
5R AFM AF AVR Q31 CN2
CT/DCS/WXA 2SK1830
FILTER
D25
SPM MA2S111
Q59
2SK1824 MUTE SW
5R
WXA SW
Q36
(Ktype only) 2SJ347
-
THERM DET
Q41 T
RN2105
VR1
ENC 5MS 5MS SW BTDET
+
D35 BATT TERMINAL
7.5V Norminal
RB521S-30 (6.0 - 9.0V)
PROTECT
Q57 IC9 Q35 D33
IC1 RN2105 Q33 D30
TCXO 5M TK11250
CM 2SK1830 2SB1184 RB521S-30 RB051L-40
Q4,5,6 5C SW (Q,R)
D40,41 5C AVR DC-IN DET BATT PROTECT PROTECT
5.0V CHARGE
B
IC5 Q53 IC12 Q37, Q38
Q30 5MV RN2701 2SB1184(Q,R) Q34 D32
TK11250 IC6 2SK1830
CUCB 2SC4617(R) RB051L-40
IC3,17 D48,49 CHARGE
5R SW D42,43,46 B
D9,14 5MV SW AVR AF/LAMP CHARGE SW
Q16,17 D47,44 AVR PROTECT
5R 5.0V
Q22,23,24
Q59
AF AMP
DC IN
13.8V Norminal
Q55 D36 IC4 (12.0 - 16.0V)
Q9,10,13 CPH3317 XC6202PB D80
RB521S-30 RB521S-30 J2
D8,10 52FR
TH1 5T 5T SW B
IC16 PROTECT AVR PROTECT
Q47 11.5V
57
TH-K2AT/K2E/K2ET
BC-21 (WALL CHARGER) / PB-43N (Ni-MH BATTERY PACK)
BC-21 External View PB-43N External View
Photo is K type.
BC-21 Specifications
Rated output voltage ......... DC 13.8V