Kenwood TH-K2AT Service Manual
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Kenwood TH-K2AT Service Manual

144mhz fm transceiver
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144MHz FM TRANSCEIVER
TH-K2AT/K2E/K2ET
SERVICE MANUAL
Helical Antenna
(T90-1018-25)
Knob
(PTT/LAMP/MON)
(K29-9274-03)
Key top (16key)
(K29-9272-02)
TH-K2AT/ K2ET
DISASSEM BLY FOR REPAIR ................................... 2
CIRCUIT DESCRIPTION ............................................ 6
SEM ICONDUCTOR DATA ...................................... 14
COM PONENTS DESCRIPTION .............................. 15
PARTS LIST ............................................................. 17
EXPLODED VIEW .................................................... 23
PACKING ................................................................. 25
ADJUSTM ENT ........................................................ 27
TERM INAL FUNCTION ........................................... 43
PC BOARD
TX-RX UNIT (X57-674X-XX) (A/ 3) ................... 44
TX-RX UNIT (X57-674X-XX) (B/ 3),(C/ 3) .......... 48
Knob (ENC)
(K29-5159-03)
Knob (VOL)
(K29-5150-03)
Front glass
(B10-2746-03)
Cap
(SP/MIC/DC IN)
(B09-0675-03)
Cabinet assy
(16key)
(A02-3819-23)
CONTENTS
©
2003-8 PRINTED IN JAPAN
B51-8658-00 (S) 836
Helical Antenna
(T90-1018-25)
Knob
(PTT/LAMP/MON)
(K29-9274-03)
Key top (4key)
(K29-9276-02)
TH-K2E
SCHEM ATIC DIAGRAM .......................................... 50
LEVEL DIAGRAM .................................................... 55
BLOCK DIAGRAM ................................................... 56
BC-21 (WALL CHARGER) ....................................... 58
PB-43N (Ni-M H BATTERY PACK) .......................... 58
BT-14 (BATTERY CASE) ......................................... 59
SPECIFICATIONS ................................. BACK COVER
Knob (ENC)
(K29-5159-03)
Knob (VOL)
(K29-5150-03)
Front glass
(B10-2746-03)
Cap
(SP/MIC/DC IN)
(B09-0675-03)
Cabinet assy
(4key)
(A02-3818-23)

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  • Page 1: Table Of Contents

    (16key) (4key) Key top (4key) (A02-3819-23) (A02-3818-23) (K29-9276-02) Key top (16key) (K29-9272-02) TH-K2AT/ K2ET TH-K2E CONTENTS DISASSEM BLY FOR REPAIR ........2 SCHEM ATIC DIAGRAM .......... 50 CIRCUIT DESCRIPTION ..........6 LEVEL DIAGRAM ............ 55 SEM ICONDUCTOR DATA ........14 BLOCK DIAGRAM ...........

  • Page 2: Disassem Bly For Repair

    TH-K2AT/K2E/K2ET DISASSEM BLY FOR REPAIR How to remove the case assembly from the chassis 1. Remove tw o screw s ( ) holding the chassis. 2. Pull out tw o knobs ( ) and remove tw o round nuts ( 3.
  • Page 3 TH-K2AT/K2E/K2ET DISASSEM BLY FOR REPAIR Soldering the antenna terminal 4. Apply the tips of soldering irons to all the four pins of the final FET at the same time ( ), heat them sufficiently, and remove 1. With the shield cover removed from the antenna terminal the final FET ( ).
  • Page 4 TH-K2AT/K2E/K2ET DISASSEM BLY FOR REPAIR Special care and attention required for assembly (2)By pressing the LCD hardw are fixture from the component side of the TX-RX PCB, you must bent all 4 tabs of the LCD 1. Gluing to the key top (M IC element section)
  • Page 5 TH-K2AT/K2E/K2ET DISASSEM BLY FOR REPAIR 4. Packing (G53-1572-02) TX/ BUSY lamp installation 6. Cautions for installing the chassis on the case assembly procedure (1)Verify that the packing (G53-1572-02) TX/BUSY lamp section (1)To assure w aterproofing, install the packing in the chassis is has been past through the hole in the illumination guide groove as show n in Fig.

  • Page 6: Circuit Description

    TH-K2AT/K2E/K2ET CIRCUIT DESCRIPTION Frequency Configuration A tuning voltage corresponding to the desired signal is applied to each varicap through the BPF/APC terminal (pin 6) The frequency configuration is show n in Figure 1 and of the M PU (IC8) to tune to the receive frequency.
  • Page 7 TH-K2AT/K2E/K2ET CIRCUIT DESCRIPTION IF Circuit FM IC and band-pass filter consisting of R125, R126, R135, The first IF signal (38.85 MHz) amplified by the IF amplifier (Q24) C173, C174. The noise component is rectified in the FM IC to and the second IF signal (38.4 MHz) generated by tripling the 12.8...
  • Page 8 TH-K2AT/K2E/K2ET CIRCUIT DESCRIPTION Transmitter System The transmission/reception sw itching circuit consists of D10, L19, D12 and D13. These diodes are turned ON in transmit M icrophone Amplifier Circuit mode and OFF in receive mode to sw itch signals. The audio signal from the microphone passes through a high-pass filter (IC5) and enters a microphone amplifier (IC16).
  • Page 9 TH-K2AT/K2E/K2ET CIRCUIT DESCRIPTION The APC voltage controls the gate voltage of Q11 and Q12, amplifying VCO output w ith an RF amplifier (Q6) and dividing and keeps transmission output stable. it w ith the PLL IC. The M PU detects pow er supply voltage and controls Q58 The PLL synthesizer w ith 5 kHz and 6.25 kHz step is...
  • Page 10 TH-K2AT/K2E/K2ET CIRCUIT DESCRIPTION Pow er Supply Circuit Pow er Supply Sw itching Circuit The voltage supplied through the battery terminal or DC IN Charging Circuit terminal is branched in the pow er supply sw itching circuit as When an external pow er supply is connected to the DC IN show n in Fig.10 and then supplied to the required components.
  • Page 11 TH-K2AT/K2E/K2ET CIRCUIT DESCRIPTION Voltage Detection Circuit LED Drive Circuit Various voltages are input to the A/D port of the M PU (IC8) The LCD and key illumination LEDs are lighted by controlling for processing. Q51 for the LCD and Q50 for keys according to the output Battery voltage is divided w ith resistors (R240, R241) and voltage from the AF/LAM P AVR (Q37).
  • Page 12 TH-K2AT/K2E/K2ET CIRCUIT DESCRIPTION Key and Encoder Input Circuit The POWER key is assigned to the interrupt port (pin 95) of Other keys composes a matrix and key presses are detected the M PU. by scanning them by softw are. The PTT key is assigned to the dedicated port (pins 13, 14) The encoder reads data using the interrupt port (pins 35 of the M PU.
  • Page 13 TH-K2AT/K2E/K2ET CIRCUIT DESCRIPTION CTCSS/ DCS DTM F The encode signal is generated by the M PU (IC8) and output The DTM F signal is generated by the M PU (IC8) and is from the TONE terminal (pin 41) of the M PU.

  • Page 14: Sem Iconductor Data

    TH-K2AT/K2E/K2ET SEM ICONDUCTOR DATA M PU : 90522BPFFG139 (IC8) Pin function Function Function Name Name Noise voltage input for squelch (A/D) CLOCK Common serial clock output RSSI voltage input for S-meter (A/D) DATA Common serial data output EEPDI Data input from EEPROM...

  • Page 15: Com Ponents Description

    TH-K2AT/K2E/K2ET SEM ICONDUCTOR DATA / COM PONENTS DESCRIPTION COM PONENTS DESCRIPTION Function Name TX-RX UNIT (X57-674X-XX) DC IN detection interrupt input ( ↓ ) DCDET L:DC IN connected Ref. No. Use/Function Operation/Condition/Compatibility RXLED Busy LED output H:ON PLL IC 100 BSFT...
  • Page 16 TH-K2AT/K2E/K2ET COM PONENTS DESCRIPTION Ref. No. Use/Function Operation/Condition/Compatibility Ref. No. Use/Function Operation/Condition/Compatibility Q33 operation Reverse current On w hen charging Battery sw itch prevention DC IN detection H: DC IN detection Ni-MH temperature On w hen temperature detection is constant-voltage...

  • Page 17: Parts List

    E,E3 TX-RX UNIT (X54-674X-XX) B62-1758-00 INSTRUCTION M ANUAL(DUTCH) E,E3 0-11 : K, K2 0-21 : M, M2 2-71 : E 2-72 : E3 B72-2128-04 M ODEL NAM E PLATE(TH-K2AT) K,K2,M B72-2128-04 M ODEL NAM E PLATE(TH-K2AT) B30-2156-05 LED(RED) B30-2157-05 LED(YELLOW )
  • Page 18 CK73HB1H102K CHIP C 1000PF K C227 C92-0587-05 CHIP-TAN 2.2UF 4W V C135 CC73HCH1H120J CHIP C 12PF C228,229 CK73HB1A104K CHIP C 0.10UF K E : TH-K2E K : TH-K2AT M : TH-K2AT E3 : TH-K2ET K2 : TH-K2AT M2 : TH-K2AT...
  • Page 19 C357 CK73EF1C105Z CHIP C 1.0UF L40-1575-71 SM ALL FIXED INDUCTOR(15NH) ∗ C358 CK73HB1A473K CHIP C 0.047UF K L40-5675-71 SM ALL FIXED INDUCTOR(56NH) E : TH-K2E K : TH-K2AT M : TH-K2AT E3 : TH-K2ET K2 : TH-K2AT M2 : TH-K2AT...
  • Page 20 J 1/ 16W R157,158 RK73HB1J334J CHIP R 330K J 1/ 16W R92-1368-05 CHIP R 0 OHM R159 RK73HB1J124J CHIP R 120K J 1/ 16W E : TH-K2E K : TH-K2AT M : TH-K2AT E3 : TH-K2ET K2 : TH-K2AT M2 : TH-K2AT...
  • Page 21 RK73HB1J221J CHIP R J 1/ 16W K,K2,M ∗ R230 RK73HB1J221J CHIP R J 1/ 16W M 2,E3 S70-0485-05 TACT SW ITCH (PTT) E : TH-K2E K : TH-K2AT M : TH-K2AT E3 : TH-K2ET K2 : TH-K2AT M2 : TH-K2AT...
  • Page 22 TRANSISTOR 2SK1830 2SC4617(R) TRANSISTOR ∗ Q5,6 2SC5488 TRANSISTOR ∗ 2SC5488 TRANSISTOR 2SC4926YD TRANSISTOR 2SK2596 2SK3476 2SK1830 ∗ RN4902 TRANSISTOR 2SC4617(R) TRANSISTOR 3SK318 E : TH-K2E K : TH-K2AT M : TH-K2AT E3 : TH-K2ET K2 : TH-K2AT M2 : TH-K2AT...

  • Page 23: Exploded View

    TH-K2AT/K2E/K2ET EXPLODED VIEW (TH-K2AT / K2ET) TX-RX Unit (B/3) TX-RX Unit (C/3) TX-RX Unit (A/3) 702. STANDARD LABEL : K, K2 701. STICKER A : N09-1492-05 B : N14-0569-04 C : N14-0573-04 D : N79-2035-46 1 (K2, M 2) E : N79-2040-45...
  • Page 24 TH-K2AT/K2E/K2ET EXPLODED VIEW (TH-K2E) TX-RX Unit (B/3) TX-RX Unit (C/3) TX-RX Unit (A/3) 701. STICKER A : N09-1492-05 B : N14-0569-04 C : N14-0573-04 D : N79-2035-46 E : N79-2040-45 F : N82-2007-46 G : N09-2433-05 Parts with the exploded numbers larger than 700 are not supplied.

  • Page 25: Packing

    TH-K2AT/K2E/K2ET PACKING (K, M , E and E3 types) 703. PAM PHLET (R & TTE) : E, E3 704. PAM PHLET 705. WARRANTY CARD : K, E, E3 11.INSTRUCTION M ANUAL (B62-1696-00) (B62-1697-00):K,E,E3 (B62-1699-00):E,E3 41.HELICAL ANTENNA (B62-1702-00):E,E3 (T90-1018-25) 42.CHARGER (230V/13.8V)
  • Page 26 TH-K2AT/K2E/K2ET PACKING (K2 and M 2 types) 11.INSTRUCTION M ANUAL (B62-1695-00):M 2 (B62-1696-00) (B62-1697-00):K2 704. PAM PHLET 705. WARRANTY CARD : K2 1.CABINET ASSY 32.HANDSTRAP (BATTERY CASE) (J69-0342-05) : M 2 (A02-3817-02) 25.ITEM CARTON CASE (H52-2009-02) 41.HELICAL ANTENNA (T90-1018-25) 30.BELT HOOK ASSY (J29-0709-04) 27.PACKING FIXTURE...

  • Page 27: Adjustm Ent

    TH-K2AT/K2E/K2ET ADJUSTM ENT Single Tone M ode G. 7.5V TX M pow er (Low er limit frequency, center frequency, upper limit frequency) This mode is used to check the DTM F deviation. H. 7.5V TX L pow er (Low er limit frequency, center frequency,...
  • Page 28 TH-K2AT/K2E/K2ET ADJUSTM ENT [F] key → [key] Key name [key] Transmit w hile this key is held dow n. Selecting a TX pow er (High/M id/Low ) Changes adjustment items. (Forw ard) LAM P Lamp alw ays ON When this key is pressed on the frequency display, it sw itches to the adjustment display.
  • Page 29 TH-K2AT/K2E/K2ET ADJUSTM ENT D. S-meter (Tw o segments in S-meter light, all segments 2 RX BPF (Center frequency) in S-meter light) (1)Press the [LAM P] or [M ONI] key on the transceiver to display 1 S-meter (Tw o segments in S-meter light) “...
  • Page 30 TH-K2AT/K2E/K2ET ADJUSTM ENT (8) Press the [M ENU] key to w rite the current APC value into (5) Press the [PTT] key to enable the transmit mode. the EEPROM . (6) Adjust the output voltage from DC pow er supply until the voltage at the battery terminal becomes 7.5V w hile the...
  • Page 31 TH-K2AT/K2E/K2ET ADJUSTM ENT (2)Press the [VFO], [M R] or [CALL] key to sw itch to the The current APC value is displayed at the low er digits of frequency display. the frequency display, and the value stored in the EEPROM (3)Turn the encoder to display the low er limit frequency on is displayed on the memory channel number display.
  • Page 32 TH-K2AT/K2E/K2ET ADJUSTM ENT J. 13.8V TX M pow er (Low er limit frequency, center (4) Repeat steps (4) to (7) of “ 1 13.8V TX M pow er (Low er frequency, upper limit frequency) limit frequency)” described on page 32.
  • Page 33 TH-K2AT/K2E/K2ET ADJUSTM ENT 2 Tone deviation (Center frequency) (2)Press the [VFO], [M R] or [CALL] key to sw itch to the frequency display. (1)Press the [LAM P] or [M ONI] key on the transceiver to display (3)Turn the encoder to display the upper limit frequency on “...
  • Page 34 TH-K2AT/K2E/K2ET ADJUSTM ENT (4) Press the [CALL] key to sw itch to the adjustment display. (2) Input a specified AG signal to microphone input. (5) When the [PTT] key is pressed to enable transmit mode, a (3) Press the [M ENU] key to w rite the current microphone input preset DCS code (023) is int ernally generat ed and level value into the EEPROM .
  • Page 35 TH-K2AT/K2E/K2ET ADJUSTM ENT Common Section M easurement Adjustment Specifications/ Item Condition Remarks Test equipment Unit Terminal Unit Parts M ethod 1.Setting and Connect the optional PG-2W LCD total illumination display Initial configuration displayed after resetting DC cable to the pow er supply.
  • Page 36 TH-K2AT/K2E/K2ET ADJUSTM ENT Receiver section M easurement Adjustment Specifications/ Item Condition Remarks Test equipment Unit Terminal Unit Parts M ethod 1.RX BPF Squelch level: 0 Adjust 1) Frequency: 145.050M Hz TX-RX Turn the VOL knob 0.63V (E, E3) Oscilloscope (A/3) knob to obtain 0.63V AF...
  • Page 37 TH-K2AT/K2E/K2ET ADJUSTM ENT M easurement Adjustment Specifications/ Item Condition Remarks Test equipment Unit Terminal Unit Parts M ethod Sw itch to Adjustment mode and carry out the operations for adjustment item D. (Refer to page 29) S-meter 3) LCD display: S1...
  • Page 38 TH-K2AT/K2E/K2ET ADJUSTM ENT M easurement Adjustment Specifications/ Item Condition Remarks Test equipment Unit Terminal Unit Parts M ethod 8.AF output 1) Frequency: 145.050M Hz TX-RX Check 400mW or more Check (E, E3) Oscilloscope (A/3) Frequency: 146.050M Hz Distortion meter (K, K2, M , M 2) AF V.M SSG output: –53dBm (501uV)
  • Page 39 TH-K2AT/K2E/K2ET ADJUSTM ENT M easurement Adjustment Specifications/ Item Condition Remarks Test equipment Unit Terminal Unit Parts M ethod 6) LCD display: P7H, Pow er meter TX-RX Encoder Write M id pow er Frequency: 145.995M Hz Am meter (A/3) [M ENU]...
  • Page 40 TH-K2AT/K2E/K2ET ADJUSTM ENT M easurement Adjustment Specifications/ Item Condition Remarks Test equipment Unit Terminal Unit Parts M ethod 8) LCD display: P13C, Pow er meter TX-RX Encoder Write 0.5W ±0.05W Frequency: 145.000M Hz Am meter (A/3) [M ENU] 0.8A or less...
  • Page 41 TH-K2AT/K2E/K2ET ADJUSTM ENT M easurement Adjustment Specifications/ Item Condition Remarks Test equipment Unit Terminal Unit Parts M ethod 1)Frequency: 145.000M Hz Linear detector TX-RX 4.2kHz ±0.1kHz (E, E3) (A/3) M IC According to the Frequency: 146.000M Hz Oscilloscope larger +, –.
  • Page 42 TH-K2AT/K2E/K2ET ADJUSTM ENT M easurement Adjustment Specifications/ Item Condition Remarks Test equipment Unit Terminal Unit Parts M ethod 9.VOX Sw itch to Adjustment mode TX-RX M IC Sensitivity and carry out the operations (A/3) Write for adjustment item O. (Refer to page 34)

  • Page 43: Term Inal Function

    TH-K2AT/K2E/K2ET ADJUSTM ENT / TERM INAL FUNCTION Adjustment points TERM INAL FUNCTION TX-RX unit (A/ 3) CN No. Pin No. Pin Name Function Component side view TX-RX UNIT (A/ 3) : TX-RX↔VOL/ ENC Vol-OUT RX audio volume output Vol-IN RX audio volume input...
  • Page 44 TH-K2AT/K2E/K2ET PC BOARD TX-RX UNIT (X57-674X-XX) (A/ 3) Component side view (J72-0883-09 A/ 3) 0-11 : K,K2 0-21 : M ,M 2 2-71 : E 2-72 : E3 R252 R231 C128 R144 R143 C126 C271 R137 R131 R149 R151 R152...
  • Page 45 TH-K2AT/K2E/K2ET PC BOARD TX-RX UNIT (X57-674X-XX) (A/ 3) Component side view (J72-0883-09 A/ 3) 0-11 : K,K2 0-21 : M ,M 2 2-71 : E 2-72 : E3 C310 POWER COM 0 R246 R248 COM 1 COM 2 COM 3...
  • Page 46 TH-K2AT/K2E/K2ET PC BOARD TX-RX UNIT (X57-674X-XX) (A/ 3) Foil side view (J72-0883-09 A/ 3) 0-11 : K,K2 0-21 : M ,M 2 2-71 : E 2-72 : E3 C100 C162 C160 R111 C158 R291 R110 R102 R345 C502 C159 CN15...
  • Page 47 TH-K2AT/K2E/K2ET PC BOARD TX-RX UNIT (X57-674X-XX) (A/ 3) Foil side view (J72-0883-09 A/ 3) 0-11 : K,K2 0-21 : M ,M 2 2-71 : E 2-72 : E3 R100 C145 C500 C501 C136 R102 C137 R341 R347 C325 C134 R346...
  • Page 48 TH-K2AT/K2E/K2ET TH-K2AT/K2E/K2ET PC BOARD PC BOARD TX-RX UNIT (X57-674X-XX) (A/ 3) Component side view (J72-0883-09 A/ 3) TX-RX UNIT (X57-674X-XX) (A/ 3) Component side view (J72-0883-09 A/ 3) 0-11 : K,K2 0-21 : M ,M 2 2-71 : E 2-72 : E3...
  • Page 49 TH-K2AT/K2E/K2ET TH-K2AT/K2E/K2ET PC BOARD PC BOARD TX-RX UNIT (X57-674X-XX) (A/ 3) Foil side view (J72-0883-09 A/ 3) TX-RX UNIT (X57-674X-XX) (A/ 3) Foil side view (J72-0883-09 A/ 3) 0-11 : K,K2 0-21 : M ,M 2 2-71 : E 2-72 : E3...
  • Page 50 TH-K2AT/K2E/K2ET PC BOARD TX-RX UNIT (X57-674X-XX) (B,C/ 3) Component side view (J72-0883-09 B,C/ 3) 0-11 : K,K2 0-21 : M ,M 2 2-71 : E 2-72 : E3 M IC1 M ENU – 2/VFO 3/M R F/CALL CALL J72-0883-09 (B/3)
  • Page 51 TH-K2AT/K2E/K2ET PC BOARD TX-RX UNIT (X57-674X-XX) (B,C/ 3) Foil side view (J72-0883-09 B,C/ 3) 0-11 : K,K2 0-21 : M ,M 2 2-71 : E 2-72 : E3 C243 KIN3 KYO2 KIN0 KYO1 KIN2 KYO0 – LAMP M IG KIN4...

  • Page 52: Tx-Rx Unit (X57-674X-Xx)(A/3)

    TH-K2AT/K2E/K2ET SCHEM ATIC DIAGRAM TX-RX UNIT (X57-674X-XX)(A/3) VOLIN VOLIN QT/DQT QT/DQT ENCA ENCA ENCB ENCB 2.08V T:0V R170 R:4.89V TX LED BUSY LED CTCSS/DCS/WX FILTER IC17 R157 NJM2902V 330k T:73mV T:3.29V R158 R:3.39V R:110mV 330k R264 R165 C331 820k TX/BUSY...
  • Page 53 TH-K2AT/K2E/K2ET SCHEM ATIC DIAGRAM TX-RX UNIT (X57-674X-XX)(A/3) VOLIN VOLIN QT/DQT QT/DQT ENCA ENCA TEMP ENCB ENCB FINAL LCD (B38-0881-05) KAPC DATA CLOCK SHIFT PLLLD PLLEN RXLED NOAA TEMP SIGIN 5MS SW LAMP TONE R342 VOXIN 5C SW R282 R283 R343...
  • Page 54 TH-K2AT/K2E/K2ET SCHEM ATIC DIAGRAM TX-RX UNIT (X57-674X-XX)(A/3) VOLIN VOLIN QT/DQT QT/DQT TEMP TEMP FINAL FINAL KAPC KAPC DATA DATA CLOCK CLOCK SHIFT SHIFT PLLLD PLLLD PLLEN PLLEN C316 R237 100k 0.1u EEPROM T:4.95V T:0V 5.0V AVR 5C SW R:0V R:4.90V...
  • Page 55 TH-K2AT/K2E/K2ET SCHEM ATIC DIAGRAM TX-RX UNIT (X57-674X-XX)(A/3) VOLIN QT/DQT TEMP TEMP FINAL FINAL KAPC KAPC DATA CLOCK SHIFT PLLLD PLLEN CN15 CN17 D1,2 150k 6.8k VCO FREQUENCY CONTROL VCO MODULATION RF AMP 2SC5066(O) RF AMP R348 1000p 1SV325 2SC5488 2SC5488 0.5p...
  • Page 56 TH-K2AT/K2E/K2ET SCHEM ATIC DIAGRAM TX-RX UNIT (X57-674X-XX)(A/3) 12.46V T:4.23V T:4.85V RF SW R:0V R:0V C329 C326 TX PATH C65 18p R271 6.8n 1000p 1.30V RF AMP HSC277 1000p 2SK2596 2SC5488 DRIVE R347 1.40V DRIVE HSC277 2SC4926YD RF SW 2.00V 3.3k...
  • Page 57 TH-K2AT/K2E/K2ET SCHEM ATIC DIAGRAM TX-RX UNIT (X57-674X-XX)(A/3) VOLIN VOLIN VOLIN VOLIN VOLIN VOLIN VOLIN T:4.23V T:4.85V 12.46V RF SW R:0V R:0V C329 TX PATH C65 18p R271 C326 6.8n 1.30V 1000p QT/DQT QT/DQT QT/DQT QT/DQT QT/DQT QT/DQT QT/DQT RF AMP...
  • Page 58 AF(1kHz) RF(145.99MHz) IC16 ANTFILTER MIC AMP 50Ω 9.74Vrms 0.84Vrms -18.68dBm 10.50dBm 4.17dBm 15.17dBm 11.00dBm 24.67dBm 20.83dBm 30.50dBm RF(145.99MHz) IF(38.85MHz) AF(1kHz) -9.83dBm 0.58Vrms ANTFILTER FM IC -53.00dBm -62.50dBm -59.33dBm -47.83dBm -31.83dBm -35.83dBm -17.33dBm 0.26Vrms 12.09mVrms 0.66Vrms...

  • Page 59: Block Diagram

    TH-K2AT/K2E/K2ET BLOCK DIAGRAM TONE DTMF/BEEP IC16 1SV305 NJM2107F NJM2904V LIMITTER AMP SPLATTER FILTER 2SC5066 D1, D2 1SV325 Q29 , D22 , D27 2SC5488 2SC4617 (R) 2SK1830 D74,D75 2SC4919 DA221 1SS361 VOX AMP RF AMP WIDE/NARR RB706F-40 LIMITTER MIC AGC PTTE/RXD...
  • Page 60 TH-K2AT/K2E/K2ET BLOCK DIAGRAM D8, D9 HSC277 2SC5488 2SC5488 2SC4926YD 2SK2596 2SK3476 2SC5488 XB15A709 PRE-DRIVE RF AMP RF AMP TX/RX SW DRIVE AMP FINAL AMP ANT SW RF AMP D12,D13 Q4,D7 RN4902 HVC131 2SC4617(R) 2SK1830 ANT SW B57331V APC SW 2103J...

  • Page 61: Pb-43N (Ni-M H Battery Pack)

    TH-K2AT/K2E/K2ET BC-21 (WALL CHARGER) / PB-43N (Ni-M H BATTERY PACK) BC-21 External View PB-43N External View Photo is K type. BC-21 Specifications Rated output voltage ..DC 13.8V ±5% PB-43N Schematic diagram Rated output current ..150mA Charging time ....Approx. 12 hours (PB-43N)

  • Page 62: Battery Case)

    TH-K2AT/K2E/K2ET BT-14 (BATTERY CASE) / PG-4Y (PROGRAM M ING INTERFACE CABLE) / M CP-1A (M EM ORY CONTROL PROGRAM ) BT-14 (6 AA/ LR6) External View PG-4Y External View M CP-1A • Available free for dow nloading from the Kenw ood w ebsite:...

  • Page 63: Specifications

    Sales M arketing Division KENWOOD ELECTRONICS U.K. LIM ITED 1 Ang M o Kio Street 63, Singapore 569110 KENWOOD House, Dw ight Road, Watford, Herts., WD18 9EB, United Kingdom KENWOOD ELECTRONICS EUROPE B.V. Amsterdamsew eg 37, 1422 AC Uithoorn, The Netherlands...

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