430MHz FM TRANSCEIVER TH-K4AT/K4E SERVICE MANUAL © 2003-9 PRINTED IN JAPAN B51-8660-00 (S) 497 Helical Antenna (T90-1019-25) Helical Antenna (T90-1019-25) Knob (ENC) (K29-5159-03) Knob (ENC) (K29-5159-03) Knob (VOL) (K29-5150-03) Front glass (B10-2746-03) Knob (PTT/LAMP/MON) (K29-9274-03) Cap (SP/MIC/DC IN) (B09-0675-03) Cabinet assy (16key) (A02-3822-23) Knob (VOL) (K29-5150-03) Front glass (B10-2746-03) Knob (PTT/LAMP/MON) (K29-9274-03) Cap (SP/MIC/DC IN) (B09-0675-03) Cabinet assy (4key) (A02-
TH-K4AT/K4E DISASSEMBLY FOR REPAIR How to remove the case assembly from the chassis c Remove two screws (z) holding the chassis. Pull out two knobs (x) and remove two round nuts (c). Pull out the SP and MIC parts of the cap from jacks (v). Turn the unit over with the bottom of the chassis facing upwards, and remove the chassis ( n ) from the case assembly (b). 5. Remove the speaker lead (m) from the connector (CN2) of the TX-RX PC board (TX-RX unit A/3). 1. 2. 3. 4.
TH-K4AT/K4E DISASSEMBLY FOR REPAIR Soldering the antenna terminal 1. With the shield cover removed from the antenna terminal section, install two screws on the PC board and bring the PC board into contact with the chassis (z). 2. Solder the antenna terminal with a soldering iron (x). 4. Apply the tips of soldering irons to all the four pins of the final FET at the same time (c), heat them sufficiently, and remove the final FET (v). (Two persons should be required to do this.) v x c z 5.
TH-K4AT/K4E DISASSEMBLY FOR REPAIR Special care and attention required for assembly 1. Gluing to the key top (MIC element section) You must also glue on the speaker storage area and heap the glue up until wealthy glued on the speaker storage area and the key top for waterproofing the MIC element side of the key top. (Fig.
TH-K4AT/K4E DISASSEMBLY FOR REPAIR 4. Packing (G53-1572-02) TX/BUSY lamp installation procedure (1) To assure waterproofing, install the packing in the chassis groove as shown in Fig. 5. (z) (2) Install the packing TX/BUSY lamp section on the chassis. (x ) z 6. Cautions for installing the chassis on the case assembly (1) Verify that the packing (G53-1572-02) TX/BUSY lamp section is has been past through the hole in the illumination guide section on the top of the case assembly. (Fig.
TH-K4AT/K4E CIRCUIT DESCRIPTION Frequency Configuration ■ First Mixer The frequency configuration is shown in Figure 1 and Table 1. The received signal passing through the band-pass filter (L32, L34) is mixed with the first local signal generated by the VCO by the first mixer (Q16) to produce a first IF signal (38.85 MHz) (Lower heterodyne). The first IF signal passes through a MCF (Monolithic crystal filter: XF1) to remove unwanted components.
TH-K4AT/K4E CIRCUIT DESCRIPTION ■ IF Circuit FM IC and band-pass filter consisting of R125, R126, R135, C173, C174. The noise component is rectified in the FM IC to produce a DC voltage, which is output from the N-REC terminal (pin 14) of the FM IC as squelch voltage. The squelch voltage enters the SQ terminal (pin 48) of the MPU (IC8) and is compared with the reference voltage preset in the MPU to control audio signal ON/OFF.
TH-K4AT/K4E CIRCUIT DESCRIPTION Transmitter System The transmission/reception switching circuit consists of D10, D11, L19, D12 and D13. These diodes are turned ON in transmit mode and OFF in receive mode to switch signals. ■ Microphone Amplifier Circuit The audio signal from the microphone passes through a high-pass filter (IC5) and enters a microphone amplifier (IC16). The signal passes through a pre-emphasis circuit, limiter amplifier and splatter filter inside the microphone amplifier.
TH-K4AT/K4E CIRCUIT DESCRIPTION The APC voltage controls the gate voltage of Q11 and Q12, and keeps transmission output stable. The MPU detects power supply voltage and controls Q58 by transmission power supply voltage and transmission power. For example, if the power supply voltage during transmission, is equal to or higher than approx. 10.5 V and if power is at Mid or Low level, the APC voltage level applied to Q12 is reduced by Q58.
TH-K4AT/K4E CIRCUIT DESCRIPTION Power Supply Circuit ■ Power Supply Switching Circuit ■ Charging Circuit The voltage supplied through the battery terminal or DC IN terminal is branched in the power supply switching circuit as shown in Fig.10 and then supplied to the required components. When an external power supply is connected to the DC IN terminal, the constant-current circuit consisting of Q33 and D31 provides a constant current of approx. 110 mA to the NiMH battery.
TH-K4AT/K4E CIRCUIT DESCRIPTION ■ Voltage Detection Circuit ■ LED Drive Circuit Various voltages are input to the A/D port of the MPU (IC8) for processing. Battery voltage is divided with resistors (R240, R241) and enters the BATT terminal (pin 52) of the MPU. Battery voltage is used for battery meter indication during transmission or for alert tone processing when an abnormal power supply voltage (approx. 16.5 V or higher) is applied.
TH-K4AT/K4E CIRCUIT DESCRIPTION ■ Key and Encoder Input Circuit The POWER key is assigned to the interrupt port (pin 95) of the MPU. The PTT key is assigned to the dedicated port (pins 13, 14) of the MPU. Other keys composes a matrix and key presses are detected by scanning them by software. The encoder reads data using the interrupt port (pins 35 and 36) of the MPU.
TH-K4AT/K4E CIRCUIT DESCRIPTION ■ CTCSS/DCS ■ DTMF The encode signal is generated by the MPU (IC8) and output from the TONE terminal (pin 41) of the MPU. The unwanted high-frequency components of the encode signal output from the MPU are removed with a low-pass filter, and applied to VCO modulation input (MOD) and TCXO VC terminal for modulation. The VCO and TCXO modulation levels are adjusted by VR6 to produce flat modulation characteristics in low and high ranges.
TH-K4AT/K4E SEMICONDUCTOR DATA MPU : 90522BPFFG139 (IC8) ■ Pin function Pin No.
TH-K4AT/K4E SEMICONDUCTOR DATA / COMPONENTS DESCRIPTION Pin No.
TH-K4AT/K4E COMPONENTS DESCRIPTION Ref. No.
TH-K4AT/K4E PARTS LIST indicates safety critical components. ∗ New Parts. Parts without Parts No. are not supplied. Les articles non mentionnes dans le Parts No. ne sont pas fournis. Teile ohne Parts No. werden nicht geliefert. L: Scandinavia Y: PX (Far East, Hawaii) Y: AAFES (Europe) K: USA T: England X: Australia P: Canada E: Europe M: Other Areas TH-K4AT/K4E (Y50-581X-XX) TX-RX UNIT (X57-675X-XX) New Ref. No. Address parts Parts No.
TH-K4AT/K4E PARTS LIST TX-RX UNIT (X57-675X-XX) New Ref. No. Address parts Parts No. Description Destination New Ref. No. Address parts Parts No. Description C56 C57 C61 C64 C65 CK73HB1H471K CC73HCH1H100D CK73HB1H471K CK73HB1H471K CC73HCH1H100D CHIP C CHIP C CHIP C CHIP C CHIP C 470PF 10PF 470PF 470PF 10PF K D K K D C158 C159 C160 C161 C162-164 CC73HCH1H130G CC73HCH1H030B CC73HCH1H130G CC73HCH1H030B CK73HB1H471K CHIP C CHIP C CHIP C CHIP C CHIP C 13PF 3.0PF 13PF 3.
TH-K4AT/K4E PARTS LIST TX-RX UNIT (X57-675X-XX) New Ref. No. Address parts Parts No. Description C247,248 C249 C250 C252 C253 CK73HB1A104K CK73HB1H471K CK73EF1C105Z CC73HCH1H101J C92-0628-05 CHIP C CHIP C CHIP C CHIP C CHIP-TAN 0.10UF 470PF 1.0UF 100PF 10UF K K Z J 10WV C255 C256,257 C258 C270-272 C276 C92-0628-05 CK73HB1H102K CK73HB1A104K CK73HB1H471K CK73HB1H471K CHIP-TAN CHIP C CHIP C CHIP C CHIP C 10UF 1000PF 0.
TH-K4AT/K4E PARTS LIST TX-RX UNIT (X57-675X-XX) New Ref. No. Address parts Parts No. Description Destination X1 X3 XF1 ∗ ∗ ∗ L77-1931-05 L77-1940-05 L71-0619-05 TCXO(12.8MHZ) CRYSTAL RESONATOR(7.982MHZ) MCF(38.85MHZ) CP1 CP2 CP31 CP32-35 R4 ∗ RK75HA1J272J RK75GB1J392J RK75GB1J392J RK75HA1J102J RK73HB1J102J CHIP-COM CHIP-COM CHIP-COM CHIP-COM CHIP R 2.7K 3.9K 3.9K 1.0K 1.
TH-K4AT/K4E PARTS LIST TX-RX UNIT (X57-675X-XX) New Ref. No. Address parts Parts No. Description Destination New Ref. No. Address parts Parts No. Description Destination RK73HB1J824J RK73HB1J184J RK73HH1J563D RK73HH1J393D RK73HB1J103J CHIP R CHIP R RESISTOR RESISTOR CHIP R 820K 180K 56K 39K 10K J J D D J 1/16W 1/16W 1/16W 1/16W 1/16W R246 R248 R252 R253,254 R255 RK73HB1J392J RK73HB1J392J RK73HB1J104J RK73HB1J102J R92-1368-05 CHIP R CHIP R CHIP R CHIP R CHIP R 3.9K 3.9K 100K 1.
TH-K4AT/K4E PARTS LIST TX-RX UNIT (X57-675X-XX) New Ref. No. Address parts D34 D35,36 D60-62 D61 D63-65 Parts No.
TH-K4AT/K4E EXPLODED VIEW (TH-K4AT) B A C 7 35 2 B 34 6 1 40 29 D 36 16 D TX-RX Unit (B/3) 10 D 37 8 31 Dx2 Gx2 D D 17 Ex2 D E D Dx2 TX-RX Unit (C/3) 20 18 9 D 15 23 33 2 TX-RX Unit (A/3) 28 39 14 Ax2 22 13 21 E 44 E 4 5 Fx2 701. STICKER 3 1 12 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.
TH-K4AT/K4E EXPLODED VIEW (TH-K4E) D C C 7 35 3 B 34 6 1 40 38 29 D 16 D TX-RX Unit (B/3) 10 D 37 8 31 Gx2 D D TX-RX Unit (C/3) 19 Dx2 20 18 Ex2 D E D Dx2 9 D 15 23 33 2 TX-RX Unit (A/3) 28 39 14 Ax2 22 13 21 E 44 E 4 5 Fx2 3 701. STICKER 12 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 24 Parts with the exploded numbers larger than 700 are not supplied.
TH-K4AT/K4E PACKING (TH-K4E) F E 702. PAMPHLET (R & TTE) 703. PAMPHLET 704. WARRANTY CARD 1 11.INSTRUCTION MANUAL (B62-1696-00) (B62-1697-00) (B62-1699-00) (B62-1702-00) (B62-1757-00) (B62-1758-00) 2 42.CHARGER (230V/13.8V) (W08-0959-05) 41.HELICAL ANTENNA (T90-1019-25) 43.BATTERY ASSY (7.2V/1100mAh) (W09-0991-05) 26.PACKING FIXTURE (H12-3146-01) 30. BELT HOOK ASSY (J29-0709-04) 32.HANDSTRAP (J69-0342-05) 24.ITEM CARTON CASE (H52-1964-02) 3 705.
TH-K4AT/K4E PACKING (TH-K4AT) H G 11.INSTRUCTION MANUAL (B62-1695-00) (B62-1696-00) 1 703. PAMPHLET 2 32.HANDSTRAP (J69-0342-05) 1.CABINET ASSY (BATTERY CASE) (A02-3817-02) 25.ITEM CARTON CASE (H52-1965-12) 41.HELICAL ANTENNA (T90-1019-25) 30.BELT HOOK ASSY (J29-0709-04) 27.PACKING FIXTURE (H12-3147-03) 3 26 Parts with the exploded numbers larger than 700 are not supplied.
TH-K4AT/K4E ADJUSTMENT Single Tone Mode This mode is used to check the DTMF deviation. Operation ■ 16key (M2 type) 1. Press the [PTT] key on the transceiver to switch to the transmission mode. 2. Press the [MONI] key to enter the single tone mode. 3. Press any key from [1] to [8] keys to transmit a single tone. The single tone is consisting of eight frequencies. [1] 697Hz [2] 770Hz [3] 852Hz [4] 941Hz [5] 1209Hz [6] 1336Hz [7] 1477Hz [8] 1633Hz 4.
TH-K4AT/K4E ADJUSTMENT Key name PTT LAMP MONI MENU F VFO MR CALL Encoder [key] Transmit while this key is held down. Changes adjustment items. (Forward) When this key is pressed on the frequency display, it switches to the adjustment display. Changes adjustment items. (Back) When this key is pressed on the frequency display, it switches to the adjustment display.
TH-K4AT/K4E ADJUSTMENT D. S-meter (Two segments in S-meter light, all segments in S-meter light) 1S-meter (Two segments in S-meter light) (1) Press the [LAMP] or [MONI] key on the transceiver to display “S1” on the LCD. The current RSSI level value is displayed at the lower digits of the frequency display, and the value stored in the EEPROM is displayed on the memory channel number display. (2) Press the [MENU] key to write the current RSSI level value into the EEPROM.
TH-K4AT/K4E ADJUSTMENT (8) Press the [MENU] key to write the current APC value into the EEPROM. 27.5V TX H power (Center frequency) (1) Press the [LAMP] or [MONI] key on the transceiver to display “P7C” on the LCD. In this case, the “ ” icon appears. (2) Press the [VFO], [MR] or [CALL] key to switch to the frequency display. (3) Turn the encoder to display the center frequency on the LCD. (4) Repeat steps (4) to (8) of “17.5V TX H power (Lower limit frequency)” described on page 29. 37.
TH-K4AT/K4E ADJUSTMENT (2) Press the [VFO], [MR] or [CALL] key to switch to the frequency display. (3) Turn the encoder to display the lower limit frequency on the LCD. (4) Press the [CALL] key to switch to the adjustment display. (5) Press the [PTT] key to enable the transmit mode. (6) Adjust the output voltage from DC power supply until the voltage at the battery terminal becomes 7.5V while the transceiver is transmitting.
TH-K4AT/K4E ADJUSTMENT J. 13.8V TX M power (Lower limit frequency, center frequency, upper limit frequency) 113.8V TX M power (Lower limit frequency) (1) Press the [LAMP] or [MONI] key on the transceiver to display “P13L” on the LCD. In this case, the “ ” icon appears. The current APC value is displayed at the lower digits of the frequency display, and the value stored in the EEPROM is displayed on the memory channel number display.
TH-K4AT/K4E ADJUSTMENT (2) Press the [VFO], [MR] or [CALL] key to switch to the frequency display. (3) Turn the encoder to display the upper limit frequency on the LCD. (4) Repeat steps (4) to (7) of “113.8V TX L power (Lower limit frequency)” described on page 32. L. DCS modulation balance (1) Press the [LAMP] or [MONI] key on the transceiver to display “DCS.BAL” on the LCD. Press the [F] key and then the [PTT] key repeatedly to turns the “ ” icon ON.
TH-K4AT/K4E ADJUSTMENT (4) Press the [CALL] key to switch to the adjustment display. (5) When the [PTT] key is pressed to enable transmit mode, a preset DCS code (023) is internally generated and modulated. (6) Turn the encoder to change the current adjustment value and adjust DCS deviation. (7) Press the [MENU] key to write the current adjustment value into the EEPROM. 2DCS deviation (Center frequency) (1) Press the [LAMP] or [MONI] key on the transceiver to display “DVC” on the LCD.
TH-K4AT/K4E ADJUSTMENT Common Section Item Condition Measurement Test equipment Unit Adjustment Terminal Unit Parts Method Specifications/ Remarks 1.Setting and Connect the optional PG-2W LCD total illumination display Initial configuration displayed after resetting DC cable to the power supply. the full-reset. DC IN terminal voltage: 13.8V 1) Total illumination display confirmation Turn the Transceiver Power ON by pressing the power switch while the [F] key is pressed.
TH-K4AT/K4E ADJUSTMENT Receiver section Item 1.RX BPF Adjust Condition Squelch level: 0 1) Frequency: 435.050MHz SSG output: –53dBm (501 uV) SSG MOD: 1kHz SSG DEV: 3kHz Switch to Adjustment mode and carry out the operations for adjustment item E. (Refer to page 29) 2) LCD display: BPL Frequency: 400.050MHz SSG: –119dBm (0.25 uV) 3) SSG: –110dBm (0.707 uV) Unit SSG Oscilloscope Distortion meter AF V.M Dummy load TX-RX (A/3) Adjustment Terminal ANT SP Unit Parts Method Turn the VOL knob 0.
TH-K4AT/K4E ADJUSTMENT Item Condition Switch to Adjustment mode and carry out the operations for adjustment item D. (Refer to page 29) S-meter 3) LCD display: S1 Frequency: 435.050MHz SSG: –120dBm (0.22uV) 4) LCD display: S9 Frequency: 435.050MHz SSG: –105dBm (1.26uV) 4.Squelch Squelch level: 1 Check 1) Frequency: 435.050MHz SSG output: –123dBm (0.158uV) SSG MOD: 1kHz SSG DEV: 3kHz 2) SSG: OFF 5.S-meter 1) Frequency: 435.050MHz Check SSG output: –120dBm (0.
TH-K4AT/K4E ADJUSTMENT Transmitter section Item Condition Measurement Test equipment Unit Adjustment Terminal Unit Parts Method DC power supply 1.TX power Battery terminal voltage: TX-RX B DVM Write (Battery 7.5V (A/3) GND terminal: 7.5V) Note: Adjust the output voltage from DC power supply until the voltage at the battery terminal becomes 7.5V while the transceiver is transmitting. High power Mid power Low power 38 Switch to Adjustment mode and carry out the operations for adjustment item F.
TH-K4AT/K4E ADJUSTMENT Item Condition 2.TX power Connect the optional PG-2W Write (DC IN DC cable to the power supply. terminal: 13.8V) DC IN terminal voltage: 13.8V Switch to Adjustment mode and carry out the operations for adjustment item I. (Refer to page 31) 1)LCD display: P13L, Frequency: 430.000MHz PTT: ON 2)LCD display: P13C, High power Frequency: 435.000MHz PTT: ON 3)LCD display: P13H, Mid power Low power 3.
TH-K4AT/K4E ADJUSTMENT Item Condition Measurement Test equipment Unit Terminal Unit To exit from the Adjustment DC power supply Mode, turn the transceiver DVM power OFF and then ON. 2)Frequency: 435.000MHz PTT: ON Battery terminal voltage: 6.4V (Adjust the output voltage from DC power supply until the voltage at the battery terminal becomes 6.4V while the transceiver is transmitting.) 4.DCS modulation balance 5.MAX DEV 6.
TH-K4AT/K4E ADJUSTMENT Item 7.Tone deviation 8.DCS deviation 9.VOX Sensitivity Write Condition Measurement Test equipment Unit Terminal Switch to Adjustment mode Linear detector and carry out the operations for adjustment item M. (Refer to page 33) Detector: P-P/2 HPF: OFF LPF: 3kHz De-emphasis: OFF TX power: Low 1)LCD display: DVL, Frequency: 430.000MHz PTT: ON 2)LCD display: DVC, Frequency: 435.000MHz PTT: ON 3)LCD display: DVH, Frequency: 439.
TH-K4AT/K4E ADJUSTMENT Item Measurement Test equipment Unit Terminal Condition 10. VOX Operation Check 11. DTMF DEV Check To exit from the Adjustment AG Mode, turn the transceiver power OFF and then ON. 1)Frequency: 435.000MHz VOX Gain: 4 AG: OFF 2)AG: 1kHz/100mV Detector: P-P/2 HPF: OFF LPF: 15kHz De-emphasis: OFF TX power: Low 1)Frequency: 435.000MHz Linear detector Send DTMF code “D” Note: For details of sending DTMF code “D”, refer to the “Single Tone Mode” on page 27.
TH-K4AT/K4E TERMINAL FUNCTION CN No. Pin No.
A 1 B C D E TH-K4AT/K4E F G H I J PC BOARD TX-RX UNIT (X57-675X-XX) (A/3) 0-21 : M2 2-71 : E Component side view (J72-0884-19 A/3) 2 6 GND KYO1 2 KIN4 BL 5 KYO2 PTT 1 C318 R154 TH1 C198 R86 FREQ + C118 C105 R78 R79 R74 R37 R140 R139 C195 R77 C109 R72 R71 R70 C213 + F1 R76 F3 R80 C108 R166 C351 R165 C331 C106 1 R211 8 IC17 4 D81 C511 R210 R171 5 R1 C211 11 Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address Ref. No. Address Ref. No.
J K L M N O P Q R S TH-K4AT/K4E PC BOARD 1 TX-RX UNIT (X57-675X-XX) (A/3) 0-21 : M2 2-71 : E Component side view (J72-0884-19 A/3) 2 6 GND KYO1 2 KIN4 BL 5 PTT 1 KYO2 C310 R246 C313 C312 CN6 POWER 1 R248 3 COM0 COM1 LCD C318 COM2 COM3 R252 SEG0 SEG1 R335 4 ANT SEG2 SEG3 SEG4 C256 R208 R209 R223 C257 C258 Q55 SEG5 R207 R263 – L49 SEG15 1 C279 C118 Q37 C 4 5 R238 SEG21 C360 C300 C302 SEG23 R244 SEG24 L63 3 1 SEG27 C346 IC9 SEG26 C351 SEG28 SEG29
A 1 B C D E TH-K4AT/K4E F G H I J PC BOARD TX-RX UNIT (X57-675X-XX) (A/3) 0-21 : M2 2-71 : E Foil side view (J72-0884-19 A/3) 2 C152 L18 R103 Q17 C153 C164 R109 R62 2 3 R108 R61 1 C156 D11 C89 4 4 C159 L40 C165 R104 C158 R110 D10 R107 R111 L38 C160 D20 C162 R353 C163 C161 C94 D21 L41 L20 R352 L22 R289 C361 L19 L21 C98 L30 D13 C93 D12 D74 C95 C97 C99 C101 C96 C100 L23 C102 3 R1 L36 C90 CN15 C91 R312 R256 R254 R253 R285 C88 CP32 CP33
J K L M N O P Q R S TH-K4AT/K4E PC BOARD 1 TX-RX UNIT (X57-675X-XX) (A/3) 0-21 : M2 2-71 : E Foil side view (J72-0884-19 A/3) 2 C145 L4 S G C5 C6 D R6 C11 C10 D6 C3 C9 L5 R8 R10 C2 D2 L1 D1 C7 L6 L3 D S G Q1 R9 C13 R7 4 R49 C364 R52 C65 R42 L27 L56 L10 2 5 3 L26 R51 Q10 R88 4 R54 G S D L54 R59 CN10 C73 R271 C326 B C324 R39 L65 R60 1 C67 C363 R344 R346 C131 L14 Q58 S D G R17 R348 C64 C130 R64 R11 R14 3 R50 R92 LV D3 L2
A 1 B C D E TH-K4AT/K4E F G H I J K L M N PC BOARD O P Q R S TH-K4AT/K4E PC BOARD 1 TX-RX UNIT (X57-675X-XX) (A/3) 0-21 : M2 2-71 : E Component side view (J72-0884-19 A/3) TX-RX UNIT (X57-675X-XX) (A/3) 0-21 : M2 2-71 : E Component side view (J72-0884-19 A/3) 2 2 6 GND C313 C312 BL 5 KYO2 C318 R335 C256 R208 R209 R223 C257 C258 Q55 SEG5 R263 C 5 R238 SEG21 C300 C302 SEG23 R77 C109 C246 R244 L63 C347 J4 SP C309 C348 SEG30 9 36 SEG31 R157 C204 10 C20
A 1 B C D E TH-K4AT/K4E F G H I J K L M N O PC BOARD P Q R S TH-K4AT/K4E PC BOARD 1 TX-RX UNIT (X57-675X-XX) (A/3) 0-21 : M2 2-71 : E Foil side view (J72-0884-19 A/3) TX-RX UNIT (X57-675X-XX) (A/3) 0-21 : M2 2-71 : E Foil side view (J72-0884-19 A/3) 2 2 C145 C4 L4 S G C5 C6 D R6 Q3 C15 C11 C10 D6 C3 C9 L5 R8 L1 C7 L6 L3 D S R9 C13 G Q1 R346 R17 R52 R42 L27 C65 5 L26 R88 4 C67 R54 G S D L54 R271 C326 B C324 R39 L65 1 R53 6 L11 C68
A 1 2 B C D TH-K4AT/K4E E F G H I J PC BOARD TX-RX UNIT (X57-675X-XX) (B,C/3) 0-21 : M2 2-71 : E Component side view (J72-0884-19 B,C/3) 3 MIC1 MENU + – D42 4 1/F 5 2/VFO 3/MR D43 F/CALL D46 4 5 6 VFO 7 8 9 MR 6 7 D47 D44 8 * 0 # CALL 9 J72-0884-19 (B/3) 10 MONI LAMP S7 PTT 11 J72-0884-19 (C/3) Ref. No.
A B C D E F PC BOARD G H I J TH-K4AT/K4E TX-RX UNIT (X57-675X-XX) (B,C/3) 0-21 : M2 2-71 : E Foil side view (J72-0884-19 B,C/3) 1 2 3 CN8 C243 – 14 KIN3 KIN0 KIN2 GND MIG 8M 2 IM + KYO2 13 KYO1 KYO0 LAMP KIN4 KYO3 KIN1 1 Q50 G D S R336 4 5 R337 6 7 R230 8 9 J72-0884-19 (B/3) 10 2 KIN4 KYO1 6 GND CN7 PTT 1 BL 5 KYO2 D48 D49 C374 11 J72-0884-19 (C/3) Ref. No.
A B C TH-K4AT/K4E D E SCHEMATIC DIAGRAM TX-RX UNIT (X57-675X-XX)(A/3) 1 MOD MOD VOLIN VOLIN 5MS 5MS 5T +B NAR TO QT/DQT 5R 5C 5MV ENCA ENCB SIGIN NAR TO R170 R324 C349 180k C212 180k 47k 0.1u C339 4.7k RB521S-30 470p C281 B30-2157-05 100 R227 0.022u 270k DTMF/1750 10 R208 R223 R234 C258 100k 18k 0.1u 1000p R209 100k DTMF/BEEP/1750 +B 5C/5R/5T 470k Q36 NI-MH TEMPERATURE DETECTION Q38 2SC4617(R) D34 R215 10k R214 22k DC IN DETECTION 8V Q37 4.
F G H I J TH-K4AT/K4E SCHEMATIC DIAGRAM TX-RX UNIT (X57-675X-XX)(A/3) MOD MOD VOLIN VOLIN 5MS 5T +B NAR TO QT/DQT 5R 5C 5MV ENCA ENCB SIGIN 5MS 5T +B NAR TO QT/DQT 5R 5C 5MV TEMP FINAL AFM KAPC DATA CLOCK SHIFT PLLLD PLLEN SMV SQV ENCA ENCB LCD (B38-0881-05) SEG30 SEG31 36 35 SEG30 SEG31 SEG28 SEG29 34 33 SEG28 SEG29 SEG27 SEG26 32 31 SEG26 SEG27 SEG24 SEG25 30 29 SEG24 SEG23 SEG25 SEG22 SEG23 28 SEG21 27 SEG22 SEG20 26 SEG21 SEG19 25 SEG20 SEG18 24 SEG19 SEG18
K L M TH-K4AT/K4E N O SCHEMATIC DIAGRAM TX-RX UNIT (X57-675X-XX)(A/3) MOD VOLIN MOD VOLIN 5MS 5T +B NAR TO QT/DQT 5R 5C 5MV TEMP FINAL AFM KAPC DATA CLOCK SHIFT PLLLD PLLEN SMV SQV 5MS 5T +B NAR TO QT/DQT 5R 5C TEMP FINAL AFM KAPC DATA CLOCK SHIFT PLLLD PLLEN SMV SQV 1 IC12 TK11250CUCB 5T 5R Q55 CPH3317 470p R328 C347 470p 470k C345 10u10 5R/5MV SW C344 LAMP 5MS SW 5T SW T:4.99V R:0V Q53 RN2701 3 2 NP GND CONT C346 T:0V R:4.90V 5.03V 470p SI IC15 AT25160N10SI27 T:4.
P Q R S T TH-K4AT/K4E SCHEMATIC DIAGRAM TX-RX UNIT (X57-675X-XX)(A/3) MOD VOLIN 5MS 5T +B NAR TO QT/DQT 5R 5C 5T +B TEMP FINAL AFM KAPC DATA CLOCK SHIFT PLLLD PLLEN SMV SQV TEMP FINAL KAPC CN15 CN17 D1-4 22n L9 R17 18n 3.3k R15 5.6k 100 12p RF AMP C29 470p C18 33 C17 R18 270 470p R16 47 R14 470p 0.01u C10 C14 3.3k L8 R9 L5 270n C9 5p (B) C3 2p (B) 1SV278 D6 470p C6 100k 0.1u 8p Q5 2SC5488 R346 R8 1k R7 47k C5 D5 HSC277 R4 C4 C15 RF AMP 150 C7 0.
U V W TH-K4AT/K4E X Y SCHEMATIC DIAGRAM TX-RX UNIT (X57-675X-XX)(A/3) 1 10.37V 47p 8p L56 C77 4.7n C76 L15 12p 4.7n C329 470p C72 47 470p R54 0.1u C71 DRIVE AMP C327 L54 R55 4.7k R56 10k C75 18p D73 MA2S111 C66 0.1u VOLTAGE DROP Q10 OPERATION SW C364 0.1u 27n L65 R39 1u C70 270 270 R41 L11 R53 C67 470p 470p C324 22 1k R52 10p 3.3k 4.
TH-K4AT/K4E SCHEMATIC DIAGRAM TX-RX UNIT (X57-675X-XX)(A/3) 5M +B 7 8 9 MR * 0 # CALL 5M +B BOARD 47p 8p C77 C76 L56 6.8n 4.7n 47 470p L13 C72 470p R55 4.7k R56 10k 0.1u 47 C73 R54 0.1u C71 L54 4.7n C327 L65 L14 R344 27n 270 R39 R41 1u C70 D73 (B) 3p C102 (B) C101 4p (B) L23 1u 5p C99 C97 (B) 4p 2p 4T C95 (B) (G) L18 220n 470p 0.01u C82 C84 0.
9.70Vrms -53.00dBm ANT ANT FILTER BPF 0.83Vrms MIC AMP IC16 Receiver Section MIC AF(1kHz) Transmitter Section -20.00dBm -60.50dBm Q17 Q10 -36.33dBm BPF 11.50dBm Q11 -40.33dBm Q24 14.00dBm Q12 27.50dBm ANT FILTER ANT 50Ω 0.28Vrms 8.23mVrms AMP IC6 0.66Vrms SP 0.58Vrms All voltage levels must be measured after setting the AF output voltage at 0.58V rms. The RF and IF sections are measured by using a spectrum analyzer.
TH-K4AT/K4E BLOCK DIAGRAM VR6 TONE DTMF/BEEP VR5 D6 1SV278 IC16 NJM2904V IC5 NJM2107F MOD LIMITTER AMP SPLATTER FILTER HPF Q1 2SK508NV (52K) OSC 5C 5T D1,2,3,4 HVC376B 5MV Q29,D22,D27 2SC4919 1SS361 RB706F-40 MIC AGC D74,D79 DA221 LIMITTER J3 Q30 2SC4617(R) Q27 2SK1830 Q6 2SC5488 VOX AMP WIDE/NARR SW RF AMP Q3 2SK1830 D24 MA742 PTTE/RXD 5MV MICM NAR SHIFT SW VOX DET LOOP FILTER LPF SHIFT D42,43,46 D44,47 B30-2205-05 IC1 LMX2316TMX 2nd Local PLL IC KEY ILLMI TCXO Q23 KTC4
TH-K4AT/K4E BLOCK DIAGRAM B LPF Q2 2SC5488 Q5 2SC5488 D8, D9 HSC277 Q9 2SC5488 Q10 2SC4926YD Q11 2SK2596 Q12 2SK3476 D10,11 HVC131 RF AMP RF AMP TX/RX SW RF AMP PRE-DRIVE AMP DRIVE AMP FINAL AMP ANT SW 5C 5R ANT 5T Q4,D7 TH1 B57331V 2103J LIPPLE FILTER D12,D13 HVC131 Q14 RN4902 Q15 2SC4617(R) Q58 2SK1830 APC SW APC KILL SW SW ANT SW BIAS SW TEMP DET FINAL Q13 2SK1830 CF1 450kHz 5C 5T D17 HSM88AS IC2 NJM2904V SW D14 RB521S-30 APC AMP ANT SW 5R BPF/APC APC V Q16 3S
TH-K4AT/K4E 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 ±5% Rated output current ......... 150mA Charging time .................... Approx.
TH-K4AT/K4E BT-14 (BATTERY CASE) / PG-4Y (PROGRAMMING INTERFACE CABLE) / MCP-1A (MEMORY CONTROL PROGRAM) BT-14 (6 AA/LR6) External View PG-4Y External View MCP-1A • Available free for downloading from the Kenwood website: http://www.kenwood.com/i/products/info/amateur.
TH-K4AT/K4E SPECIFICATIONS General Market code Number of memory channels Antenna impedance (Connector type) Operating Voltage DC IN Jack Battery terminal Grounding method Current TH-K4AT TH-K4E M2 E 100 (50) + 8 special function memories 50 Ω (SMA) DC 12.0 ~ 16.0 V (13.8 V nominal) DC 6.0 ~ 9.0 V (7.2 V nominal) Negative ground Transmit with H, 13.8 V (DC IN) 1.8 A or less Transmit with H, 7.2 V (PB-43N) 2.0 A or less Transmit with M, 7.2 V (PB-43N) 1.5 A or less Transmit with L, 7.
