HYT TC-446 Service Manual

Download

Page 1

www. hy t. c om . cn

Page 2

Page 3

－ 1 －

Content

General… … … … … … … … … … … … … … … … … … … … … … … … … … … … … 2

Brief Introduction… … … … … … … … … … … … … … … … … … … … … … … … ..3

Software Description… … … … … … … … … … … … … … … … … … … … … … ..4

Circuit Description… … … … … … … … … … … … … … … … … … … … … … … ..8

CPU Pins… … … … … … … … … … … … … … … … … … … … … … … … … … … … 12

Part List 1… … … … … … … … … … … … … … … … … … … … … … … … … … … ..14

Adjustment Description… … … … … … … … … … … … … … … … … … … … … .26

Troubleshooting chart… … … … … … … … … … … … … … … … … … … … … … 29

Disassembly and Assembly… … … … … … … … … … … … … … … … … … ..42

Exploded View… … … … … … … … … … … … … … … … … … … … … … … … ..45

Part List 2… … … … … … … … … … … … … … … … … … … … … … … … … … … .46

Packing… … … … … … … … … … … … … … … … … … … … … … … … … … … … ..48

PC Board View… … … … … … … … … … … … … … … … … … … … … … … … … .49

Block Diagram… … … … … … … … … … … … … … … … … … … … … … … … … ..50

Schematic Diagram… … … … … … … … … … … … … … … … … … … … … … ..51

Specifications… … … … … … … … … … … … … … … … … … … … … … … … … 52

Page 4

TC- 446 Service Manual

－ 2 －

General

 Manual Scope

This manual is intended for use by experienced technicians familiar with similar types of communication equipment. It contains all service information required for the equipment and is current as of the publication date.

 User Safety Information

The following precautionsare recommended for personnel safety:

 DO NOT transmit until all RF connectors are verified secure and any open connectors are

properly terminated.

 SHUT OFF and do not operate this equipment near electrical blasting caps or in an explosive

atmosphere.

 When in vehicles with an airbag, do not place a portable radio in the area over an airbag or in the

airbag deployment area.

 Do not expose the radio to direct sunlight for a long time nor place it close to a heating source.  Do not use any portable radio with a damaged antenna. If a damaged antenna comes into contact

with your skin, a minor burn may result.

 When transmitting with a portable radio, hold the radio in a vertical position with its microphone

about 5 centimeters away from your mouth.

 If you wear a portable radio on your body, be sure to keep the antenna at least 2.5 centimeters

away from your head or body when transmitting.

 This equipment should be serviced by qualified technicians only.

Page 5

TC- 446 Service Manual

－ 3 －

Brief Introduction

(1)

(3)

(4)

(6)

(5)

(7)

(9)

(8)

(2)

(10)

(11)

(12)

(13)

1. Antenna

2. LED indicator

The light will glow red during transmission. The light will glow green during receiving. During transmission, the light flashes red when the battery voltage is low.

3. Channel selector knob

Turn the channel selector knob to select from channels 1-16 (Channel 16 can be programmed by your dealer as scan function).

4. Power/Volume control knob

Rotate the Power/VolumeKnob clockwise until a “click”is heard to turn the radio on, fully counter clockwise until a “click”is heard to turn the radio off. When the radio is on, turn the knob to adjust volume.

5. PTT key

Press and hold PTT key to talk, release to receive.

6. Monitor key

In receive mode, long press(above 2 seconds) Monitor key to monitor activity on the current channel.

7. Microphone

8. Speaker

9. External jack

Remove the jack cover and insert an earphone; or insert programming cable into the jack to programme the radio via programming software.

10. Battery

11. Belt clip

Used to clip radio on your belt.

12. Battery latch

Used to fasten and remove the battery.

13. Charging connectors

Connect the charging connectors with that on the charger to begin charging.

Page 6

TC- 446 Service Manual

－ 4 －

Software Specification

 Radio Feature Description

1. Use channel selector knob to choose from 15+1(Scan) channels

2. Monitor

3. CTCSS/CDCSS Non-standard Model (Other): 38+83 groups

4. Channel Spacing

12.5KHz Narrow Optional

5. Channel Scan (Priority channel and scan revert channel available)

6. Battery Save feature (Dealer programmable)

7. Time-out Timer (TOT)

8. Squelch Level Control (9 levels)

9. Low Battery Alert

10. Model Set Mode

11. PC Programming and Adjusting Mode

12. User Wired Clone Mode

13. Factory Wired Clone Mode

14. Manual Adjust Mode

 Radio Modes

1. User Mode:

User mode is conventional communication mode. Turn the power on while disconnecting the two SELF points, the radio enters user mode. (Refer to “TC-446 Owner’s Manual”for details about operation in this mode.)

2. Model Set Mode

(1) If the radio is standard model, short out the two MS2 points on PCB and then operate following the steps (3) (5) and

(6). If the radio is non-standard model, please disconnect the two MS2 points on PCB and then operate the following steps.

(2) To select MS1 (See the initial data table) according to the radio model, if MS1 is 1, short out the two MS1 points on

PCB and continue the following operation. If not, disconnect the two MS1 points and continue.

(3) Short out the two SELF points on PCB and then turn the power on. Two beeps sound. (4) Turn channel selector knob to the corresponding position (1-11) according to the radio model (Refer to the initial

data table).

(5) Press PTT key while holding down MONI key to set the model. Channel data and settings are initialized (Refer to

the initial data table).

(6) Turn off the power and then disconnect the two SELF points on PCB to complete the model setting. Take TC-446 (446.00625~446.09375MHz) as example. From the initial data table, it is of standard model. Toinitializeits model and channel data, you can operate as following: (1) Short out the two MS2 points on PCB; (2) Short out the two SELF points. Power on and two BEEP sounds will be heard. (3) Press PTT key while holding down MONI key. Channel data and settings are initialized (refer to the initial data table).

Page 7

TC- 446 Service Manual

－ 5 －

(4) After data reset, turn off the power, disconnect the two SELF points and restart the power to use the radio. Remarks: The old data (frequency, CTCSS/CDCSS, channel function settings) will be changed once the model is set, and part of functions will also be changed. Therefore, do not make this operation unless it’s very necessary, such as changing the EEPROM, etc.

3. PC Programming Mode

The following parameters can be set through programming software:

（1） Receive frequency and transmit frequency （2） Receive signaling and transmit signaling （3） Busy channel lockout （4） Time-out timer （5） Squelch level （6） Battery save （7） Audio alarm （8） Monitor mode （9） Scan mode （10） Scan revert channel （11） Priority scan channel （12） N/W Model （13） low power （14） N setting

4. PC Adjusting Mode

The following parameters can be set via PC programming software: (1) Low battery alert level (2) Squelch level 9 (3) Squelch level 3 (4) CTCSS deviation (narrow) (5) CDCSS deviation (narrow)

5. Manual Adjust Mode

If manual adjust mode is enabled, turn on the power while holding down PTT and MONI simultaneously,the radio enters manual adjust mode after 2 seconds. Choose the adjusting items by turning the channel selector knob to CH1-CH5 position; use PTT (upwards) or MONI (downwards) to adjust (Note: MIC jack shouldn’t be connected with external cable while adjusting), CH1-CH5 positions are defined as follows: (1) Low battery alert level (2) Squelch level 9 (3) Squelch level 3 (4) CTCSS deviation (narrow) (5) CDCSS deviation (narrow)

Note:

To enable or disable manual adjust mode: short out the two SELF points, turn on the powerto enter model set mode. And then the manual adjust mode is enabled. Press [PTT], manual adjust mode is disabled. This mode is suggested to be disabled after the adjustment is completed.

Page 8

TC- 446 Service Manual

－ 6 －

6. User/Factory Wired Clone Mode

Turn on the power while holding down MONI, the radio enters wired clone mode. (1) If the two SELF points are disconnected, press MONI again to begin user wired clone and red LED blinks; When

cloning is completed, red LED goes out.

(2) If the two SELF points are short circuit, press MONI again to begin factory wired clone and red LED blinks; When

cloning is completed, red LED goes out.

Note: The difference between user wired clone mode and factory wired clone mode is that the latter is able to clone tune parameters.

Page 9

TC- 446 Service Manual

－ 7 －

 Initial data table

Note: For standard model, CTCSS isoff inall channels after initialization.

MS1 Model

Frequency (MHz) IF (MHz)

1CH 2CH 3CH 4CH 5CH 6CH 7CH 8CH 9-16CH

(MHz)Rx(MHz)Tx(MHz)Rx(MHz)Tx(MHz)Rx(MHz) (MHz) (MHz) (MHz) (MHz) (MHz) (MHz)

Standard 446.00625~446.09375 -21.4 446.00625 446.00625 446.05625 446.05625 446.03125 446.03125 446.08125 446.01875 446.06875 446.04375 446.09375

CH QT/DQT OFF OFF OFF OFF 97.4 97.4 71.9 79.7 67 85.4 023

Page 10

TC- 446 Service Manual

－ 8 －

Circuit Description

1. Frequency Configuration

The receiver utilizes double conversion superheterodyne. The first IF is 21.4MHz and the second is 455KHz. The first local oscillator signal is supplied from PLL circuit. Frequency needed in the transmitter is supplied from PLL circuit. Figure 1 shows the frequency configuration.

Frequency Range: 446.00625 MHz— 446.09375MHz

Figure 1 frequency configuration

2. Receiver

The receiver utilizes double conversion superheterodyne.

1) Front-end RF Amplifier The input signal from antenna is amplified in RF amplifier (Q27) after passing through the receive/transmit switch circuit and a 3-stage LC band pass filter. The amplified signals are filtered by a band pass filter (a 3-stage LC BPF) to eliminate unwanted signals before they goes to the first frequency mixer.

Figure 2 receiver section configuration

Page 11

TC- 446 Service Manual

－ 9 －

2) The First Mixer The signal from RF amplifier is mixed with the first local oscillator signal from PLL frequency synthesizer in the first mixer (Q23) to generate a 21.4MHz first IF signal. The first IF signal is then fed through two monolithic crystal filters (XF1) to remove spurious signals from adjacent channels.

3) IF Amplifier The first IF signal is amplified in Q22 and then enters the IF process chip IC1. The signal is mixed with the second local oscillator signal in IC1 to create a 455KHz second IF signal. The second IF signal is then fed to a 455KHz ceramics filter (CF1) to eliminate unwanted signals before it is amplified and FM detected in IC1.

4) AF Amplifier The demodulated AF signal obtained from IC1 is amplified in IC7 (1/4), and then filtered by low pass filter Q19 and high pass filter Q20, and then de-emphasized by R130 and C156. The resulting AF signal passes through a volume control circuit and then is amplified to a sufficient level to drive the speaker by AF power amplifier (IC8).

5) Squelch Part of the AF signal from IC1 enters IC1 again, and the noise component is amplified and rectified by a filter and an amplifier to produce a DC voltage corresponding to the noise level. The DC signal from IC1 goes to the analog port of the microprocessor (IC11). IC11 determines whether to output sounds from the speaker by detecting whether the input voltage is higher or lower than preset value. To output sounds from the speaker, IC11 sends a high level signal to the MUTE and AFCO lines and turns IC8 on through Q12.

DET

FM IF IC1

IF AMP

HPF

AMP

IC7

LPF

HPFDET

39 40 1

Q12

AF/PF AMP

IC7

LPF

IC11 MCU

BUSY

MUTE

AFCO

IC8

Figure 3. AF amplifier and squelch circuit

Page 12

TC- 446 Service Manual

－ 10 －

6) Receivesignaling CTCSS/CDCSS Audio frequencies over 300Hz of the output signal from IC1 is cut off by a low-pass filter. The resulting signal enters the microprocessor IC11. IC11 determines whether the CTCSS/CDCSS matches the preset value and controls the MUTE and AFCO and the speaker sound output according to the squelch results.

3. PLL Frequency Synthesizer

PLL circuit generates the first local oscillator signal for reception and the RF signal for transmission.

1) PLL Circuit

The step frequency of PLL circuit is 2.5KHz or 6.25 KHz. A12.8MHz reference oscillator signal is divided at IC2 by a fixed counter to produce a 2.5 KHz or 6.25 KHz reference frequency. Output signal from voltage control oscillator (VCO) passes through buffer amplifier Q14 and is divided at IC2 by the dual-module programmable counter. The divided signal is compared in the phase comparator IC2 with the 2.5 KHz or 6.25 KHz reference signal. The output signal from phase comparator is filtered through a low-pass filter and passed to the VCO to control the oscillator frequency. (See figure 4)

Figure 4 PLL circuit

2) VCO The operating frequency is generated by Q16 in transmit mode and by Q8 in receive mode. The operation frequency generates a voltage through the phase comparator to

control the varactor diodes, so as to keep the oscillator frequency consistent with the preset frequency in CPU (D2 and D3 in transmit mode and D7 and D8 in receive mode). T/R pin is set high in receive mode causing Q6 to turn off Q16 and turn Q7 on. The T/R pin is set low in transmit mode. The output from Q8 and Q16 is amplified by Q14 and sent to the buffer amplifier.

Page 13

TC- 446 Service Manual

－ 11 －

4. Transmitter

1) Transmit audio

The audio signal from microphone is amplified through IC3, and then pre-emphasized , and then filtered by another low-pass filter（separate filter）(Q25 and Q24) to eliminate the frequencies over 3KHz. The resulting signal enters the VCO for direct FM modulation. (See figure 5)

2) CTCSS/CDCSSEncoder

The necessary frequency for CTCSS/CDCSS encoder is generated by IC11 and FM-modulated to the PLL reference signal. Since the reference OSC does not modulate the loop characteristic frequency or higher, modulation is performed at the VCO side by splitter. (See figure 5)

Figure 5 transmitCTCSS

3) RF amplifier

The transmit signal obtained from VCO buffer amplifier Q14 is amplified by Q15 and Q17. This amplified signal is passed to power amplifier Q32 and Q31, and is capable of producing a 4.0W RF power.

4) Antenna Switch and LPF

The RF amplifier output signal is passed through a low-pass filter network and a transmit/receive switch circuit before it is passed to the antenna terminal. The transmit/receive switch circuit is comprised of D11 and D12. D11 and D12 is turned on in transmit mode and off in receive mode.

5. Power

The 5V reference power supply for the control circuit is derived from an internal battery. The reference power provides a 5V supply in transmit mode [T_V], a 5V supply in receive mode [R_V], and a 5V supply shared in both modes based the control signal from the microprocessor.

6. Control System

The IC11 CPU operates at 7.3728MHz.

Page 14

TC- 446 Service Manual

－ 12 －

CPU Pins

PIN No. PIN NAME I/O DESCRIPTION

1 TI I CTCSS/CDCSS input 2 BUSY I Input busy signal 3 BATT I Detect battery voltage 4 TIBI I CTCSS/CDCSS exterior circuit central point input 5 NC 6 SAVE O Power saving control H: OFF L: ON 7 TXLow O Transmitter power control H: Low power L: High power 8 NC

9 DAT O data output 10 CLK O clock output 11 LE O PLL IC enable 12 BEEP O Beep output 13 SCL O E2PROM clock cable 14 SDA I/O E2PROM data cable 15 MUTE O MIC mute control H: Mic mute L:Mic enable 16 MS1 I Model set 17 GREEN O Green light control H: light 18 RED O Red light control H: light 19 TXD O RS-232C output 20 RXD I RS-233C input 21 PTTK I PTT key input 22 MS2 I Standard model select H: Non-standard L: Standard 23 RXC O Receiver power control L: power on 24 NC 25 RESET I Reset input 26 SELF I Self-program L: on 27 TXC O Transmitter power control H:on 28 X

I Oscillator input

29 X

OUT

O Oscillator output 30 Vss I Grounding 31 R/T O TX/RX control H：RX L： TX 32 UL I PLL unlock detector H: Lock L: unlock 33 IF-SELECT I IF select H: 21.4MHz L: 45.05MHz 34 MONIK I MONI key input 35

ENC0

I Channel selector knob encode input

36 ENC1 I 37 ENC2 I

Page 15

TC- 446 Service Manual

－ 13 －

ENC3

39 AF

MUTE

O Audio muting control 40 AFP O Audio power control 41 TONE5 O CTCSS code output 42 TONE4 O CTCSS code output 43 TONE3 O CTCSS code output 44 TONE2 O CTCSS code output 45 TONE1 O CTCSS code output 46 TONE0 O CTCSS code output 47

WNTC

O W/N L: Wide H: Narrow

47-70 NC

71 Vcc I Power input:5V 72 V

REF

I A-D converse reference voltage

73 Avss I A-D GND

74-77 NC

78 NC 79 NC 80 NC

Page 16

TC- 446 Service Manual

－ 14 －

Part List 1

No. P/N Material Name Qty. Ref. No. Address

1 3001051830000 Chip resistor 0402 18KΩ J 1/1 1 R622 B3I 2 3001060000000 Chip resistor 0603 0Ω J 1/10W 16 C23 B3F 3 D20 T1D 4 L3 B3H 5 Q41 T3F 6 R106 T3F 7 R107 B3B 8 R108 B3E

9 R110 T4G 10 R151 B5E 11 R192 B4E 12 R194 B3F 13 R197 B4F 14 R202 B2B 15 R508 B5B 16 R601 B1E 17 R602 B3C 18 3001061000000 Chip resistor 0603 10Ω J 1/10 6 R112 T3E 19 R113 T5J 20 R164 B2C 21 R196 B4G 22 R80 B2D 23 R82 B4G 24 3001061010000 Chip resistor 0603 100Ω J 1/1 6 R127 B5F 25 R147 B4E 26 R74 B2C 27 R75 B4J 28 R76 B5E 29 R90 T5H 30 3001061020010 Chip resistor 0603 1KΩ J 1/10 12 R203 T2E 31 R39 B3B 32 R51 B1F 33 R52 T3F 34 R53 B2D 35 R56 B2B 36 R57 B5B 37 R58 T4B 38 R59 T3B 39 R60 T2D 40 R61 T2D 41 R89 T4I 42 3001061030010 Chip resistor 0603 10KΩ J 1/1 10 R100 T4B 43 R204 T2G 44 R36 B4B

Page 17

TC- 446 Service Manual

－ 15 －

Part List 1

No. P/N Material Name Qty. Ref. No. Address

45 R37 T2E 46 R38 B2A 47 R40 B3F 48 R41 T5F 49 R42 T5E 50 R44 B2I 51 R45 B2I 52 3001061040010 Chip resistor 0603 100KΩ J 1/ 15 R10 B4C 53 R12 B4B 54 R13 B3D 55 R15 B3D 56 R175 T2B 57 R176 T2B 58 R18 T2C 59 R35 T2C 60 R623 B4E 61 R624 B4F 62 R625 B3E 63 R626 B3F 64 R7 B4B 65 R8 B2E 66 R9 B1D 67 3001061050010 Chip resistor 0603 1MΩ J 1/10 2 R109 T2B 68 R116 T3B 69 3001061230000 Chip resistor 0603 12KΩ J 1/1 2 R170 B1D 70 R617 B4H 71 3001061240010 Chip resistor 0603 120KΩ J 1/ 3 R11 B3B 72 R124 T3F 73 R72 B2D 74 3001061510000 Chip resistor 0603 150Ω J 1/1 2 R68 B2E 75 R69 B2C 76 3001061520000 Chip resistor 0603 1.5KΩ J 1/ 3 R48 B3E 77 R50 T5F 78 R55 T2E 79 3001061530010 Chip resistor 0603 15KΩ J 1/1 3 R161 T4F 80 R162 T4G 81 R163 T4F 82 3001061540000 Chip resistor 0603 150KΩ J 1/ 5 R139 B4B 83 R14 B3D 84 R140 B4A 85 R141 B4A 86 R142 B4A 87 3001061820000 Chip resistor 0603 1.8KΩ J 1/ 2 R131 T4E 88 R144 B3C

Page 18

TC- 446 Service Manual

－ 16 －

Part List 1

No. P/N Material Name Qty. Ref. No. Address

89 3001061850000 Chip resistor 0603 1.8MΩ J 1/ 2 R155 T5G 90 R156 T5F 91 3001062030000 Chip resistor 0603 20KΩ J 1/1 1 R98 B3D 92 3001062220000 Chip resistor 0603 2.2KΩ J 1/ 4 R165 B4F 93 R174 T4H 94 R3 B4B 95 R6 T2B 96 3001062230000 Chip resistor 0603 22KΩ J 1/1 2 R104 B3H 97 R120 T4G 98 3001062240010 Chip resistor 0603 220KΩ J 1/ 2 R145 T5F 99 R167 T1D

100 3001062710000 Chip resistor 0603 270Ω J 1/1 1 R616 T3E 101 3001062720000 Chip resistor 0603 2.7KΩ J 1/ 4 R114 B1B 102 R49 B4D 103 R64 B2G 104 R65 B2G 105 3001062730010 Chip resistor 0603 27KΩ J 1/1 2 R102 B3H 106 R132 B3C 107 3001062740010 Chip resistor 0603 270KΩ J 1/ 2 R16 B3D 108 R2 B3C 109 3001063020000 Chip resistor 0603 3KΩ J 1/10 1 R81 B3F 110 3001063310010 Chip resistor 0603 330Ω J 1/1 5 R122 B3G 111 R146 B4D 112 R5 B4E 113 R67 B2D 114 R96 B2B 115 3001063320000 Chip resistor 0603 3.3KΩ J 1/ 14 R135 B4B 116 R136 B4A 117 R137 B4B 118 R138 B5A 119 R25 B4B 120 R26 B4D 121 R27 B2F 122 R28 B1F 123 R29 B2D 124 R30 B2E 125 R31 B3G 126 R32 B5E 127 R33 T5F 128 R34 B2D 129 3001063330010 Chip resistor 0603 33KΩ J 1/1 1 R24 T2G 130 3001063340000 Chip resistor 0603 330KΩ J 1/ 1 R43 T2A 131 3001063930010 Chip resistor 0603 39KΩ J 1/1 5 R152 T5F 132 R153 T5F

Page 19

TC- 446 Service Manual

－ 17 －

Part List 1

No. P/N Material Name Qty. Ref. No. Address

133 R154 T4F 134 R158 T5F 135 R159 T5E 136 3001064700000 Chip resistor 0603 47Ω J 1/10 4 R115 B2A 137 R123 B3G 138 R125 B3H 139 R191 B2B 140 3001064710000 Chip resistor 0603 470Ω J 1/1 4 L1 B4B 141 R118 B2I 142 R166 B4F 143 R62 B2I 144 3001064720000 Chip resistor 0603 4.7KΩ J 1/ 6 R121 T1B 145 R177 T2A 146 R84 B2C 147 R87 T2A 148 R88 T1C 149 R99 T1B 150 3001064730000 Chip resistor 0603 47KΩ J 1/1 13 R101 B4H 151 R103 B4G 152 R105 B1E 153 R128 B3B 154 R4 T2B 155 R54 T3G 156 R606 T3I 157 R607 T3I 158 R608 T3I 159 R609 T3I 160 R610 T2C 161 R615 B3B 162 R93 T2F 163 3001064740010 Chip resistor 0603 470KΩ J 1/ 2 R22 T1D 164 R94 T3F 165 3001065620010 Chip resistor 0603 5.6KΩ J 1/ 2 R130 B4B 166 R79 B2D 167 3001065630000 Chip resistor 0603 56KΩ J 1/1 4 R149 B3E 168 R157 T4F 169 R198 T4E 170 R627 171 3001065640000 Chip resistor 0603 560KΩ J 1/ 1 R148 B4D 172 3001066810010 Chip resistor 0603 680Ω J 1/1 1 R70 B3F 173 3001066820000 Chip resistor 0603 6.8KΩ J 1/ 1 R85 T4F 174 3001066830000 Chip resistor 0603 68KΩ J 1/1 1 R618 175 3001066840000 Chip resistor 0603 680KΩ J 1/ 1 R134 B3C 176 3001067540000 Chip resistor 0603 750KΩ J 1/ 1 R160 T4G

Page 20

TC- 446 Service Manual

－ 18 －

Part List 1

No. P/N Material Name Qty. Ref. No. Address

177 3001068200000 Chip resistor 0603 82Ω J 1/10 1 R171 B1D 178 3001068210010 Chip resistor 0603 820Ω J 1/1 3 R47 B4D 179 R619 B4D 180 R66 B1F 181 3001068220000 Chip resistor 0603 8.2KΩ J 1/ 3 R117 B2B 182 R169 B1D 183 R628 T2E 184 3001068230010 Chip resistor 0603 82KΩ J 1/1 2 R133 T2C 185 R97 B3C 186 3001068240000 Chip resistor 0603 820KΩ J 1/ 1 R1 B4B 187 3001080000000 Chip resistor 1206 0Ω J 1/4W( 4 F1 T4G 188 R172 T2H 189 R173 T2I 190 R77 T2H 191 3002994730000 Trimmer resistor 2.7*2.0*1.6 47K 1 VR2 T5E 192 3002996830000 Trimmer resistor(2*2) 68KΩ(+25%) 3 VR3 T4E 193 VR4 T1B 194 VR5 195 3005991030070 Array resistor 0603 10KΩ*4 J 1/ 2 CP1 T1B 196 CP6 T4A 197 3005061030040 Array resistor 0603 10KΩ*2 J 1/ 1 CP5 T1B 198 3005064720000 Array resistor 0603 4.7KΩ*2 J 1 1 CP4 T1B 199 3005064720010 Array resistor 0603 4.7KΩ*4 J 1 1 CP3 T1B 200 3101050100000 Chip capacitor 0402 1PF C 50V 4 C104 B4G 201 C143 B4I 202 C146 B4I 203 C95 B1E 204 3101050200010 Chip capacitor 0402 2PF B 50V 2 C134 B5H 205 C195 B2B 206 3101050300000 Chip capacitor 0402 3PF B 50V 3 C103 B2B 207 C105 B4G 208 C136 B3H 209 3101050400010 Chip capacitor 0402 4PF B 50V 1 C186 B2C 210 3101050500010 Chip capacitor 0402 5PF B 50V 3 C107 B4E 211 C108 B5E 212 C189 B2C 213 3101050590020 Chip capacitor 0402 0.5PF B 50 4 C163 B4F 214 C164 B4G 215 C91 B2D 216 C94 B4E 217 3101050600010 Chip capacitor 0402 6PF B 50V 5 C106 B5E 218 C182 B1D 219 C96 B2D 220 C97 B2E

Page 21

TC- 446 Service Manual

－ 19 －

Part List 1

No. P/N Material Name Qty. Ref. No. Address

221 C98 B3G 222 3101050800000 Chip capacitor 0402 8PF B 50V 6 C101 B4I 223 C139 B4I 224 C141 B4J 225 C142 B4I 226 C193 B1D 227 C90 B1E 228 3101051000000 Chip capacitor 0402 10PF D 50V 6 C135 B3F 229 C144 T4F 230 C187 B2C 231 C253 232 C255 233 C88 B2E 234 3101051010030 Chip capacitor 0402 100PF J 50 6 C132 B2D 235 C15 B2A 236 C16 B2A 237 C17 B2A 238 C179 B3C 239 C180 B2A 240 3101051020010 Chip capacitor 0402 1000PF K 5 30 C109 B2C 241 C110 B2C 242 C111 B4H 243 C113 B2B 244 C114 B3H 245 C121 B2E 246 C147 B4I 247 C252 248 C26 B2B 249 C59 B1G 250 C60 B1G 251 C61 B2G 252 C62 B2G 253 C65 B1C 254 C66 T1E 255 C68 B3H 256 C69 B3C 257 C70 B4A 258 C71 B5B 259 C73 B3E 260 C74 B4E 261 C75 T4F 262 C76 T4G 263 C77 T4G 264 C78 T2D

Page 22

TC- 446 Service Manual

－ 20 －

Part List 1

No. P/N Material Name Qty. Ref. No. Address

265 C79 T1E 266 C80 T1D 267 C81 T1C 268 C82 B2I 269 C83 B2I 270 3101051030020 Chip capacitor 0402 0.01UF K 2 15 C10 T5F 271 C11 T1B 272 C12 B3I 273 C137 T2I 274 C2 B4B 275 C240 T3J 276 C241 T3J 277 C242 T3J 278 C243 T3J 279 C3 B4B 280 C4 B4C 281 C5 B1F 282 C7 B2C 283 C8 B4A 284 C9 T5F 285 3101051040040 Chip capacitor 0402 0.1UF K 10 15 C178 T2B 286 C233 B4E 287 C246 B3B 288 C250 T3E 289 C37 B4B 290 C38 B4C 291 C39 B4D 292 C40 T2F 293 C43 B3C 294 C45 B5B 295 C46 B3C 296 C50 T4G 297 C51 B3I 298 C64 T2F 299 C84 T2E 300 3101051590000 Chip capacitor 0402 1.5PF B 50 2 C140 B4I 301 C196 B3E 302 3101051810000 Chip capacitor 0402 180PF J 50 1 C18 B5B 303 3101051830000 Chip capacitor 0402 0.018UF K 1 C156 B5B 304 3101052200010 Chip capacitor 0402 22PF J 50V 2 C100 B2D 305 C188 B1C 306 3101052210010 Chip capacitor 0402 220PF J 50 3 C13 B4B 307 C14 B4B 308 C239 T5I

Page 23

TC- 446 Service Manual

－ 21 －

Part List 1

No. P/N Material Name Qty. Ref. No. Address

309 3101052220000 Chip capacitor 0402 2200PF K 5 1 C254 310 3101052230000 Chip capacitor 0402 0.022UF K 4 C167 T5F 311 C168 T4G 312 C169 T4G 313 C44 B4B 314 3101052240010 Chip capacitor 0402 0.22UF Z 1 1 C123 B1B 315 3101052490010 Chip capacitor 0402 2.4PF B 50 2 C102 B4I 316 C192 B1D 317 3101052710000 Chip capacitor 0402 270PF J 50 1 C67 B3H 318 3101052720000 Chip capacitor 0402 2700PF K 5 1 C172 T5F 319 3101053300000 Chip capacitor 0402 33PF J 50V 5 C175 T2B 320 C176 T3B 321 C52 B4B 322 C53 B4B 323 C54 B4C 324 3101053320010 Chip capacitor 0402 3300PF K 5 1 C166 T5F 325 3101053330000 Chip capacitor 0402 0.033UF K 5 C150 B4B 326 C151 B4B 327 C152 B4B 328 C153 B4B 329 C160 B3D 330 3101053340000 Chip capacitor 0402 0.33UF K 6 2 C126 B1B 331 C133 B4G 332 3101053900000 Chip capacitor 0402 39PF J 50V 1 C138 B3H 333 3101053920000 Chip capacitor 0402 3900PF K 2 1 C181 T2C 334 3101053930000 Chip capacitor 0402 0.039UF K 1 C122 T2E 335 3101054700010 Chip capacitor 0402 47PF J 50V 1 C55 B3I 336 3101054710010 Chip capacitor 0402 470PF K 50 22 C149 B2G 337 C197 B3B 338 C20 B4B 339 C204 B3F 340 C207 B3F 341 C208 B4J 342 C21 B2E 343 C22 B2D 344 C231 B1C 345 C24 B4G 346 C25 B2B 347 C251 B3E 348 C27 B3G 349 C28 B4H 350 C29 B3I 351 C30 B4I 352 C31 B2D

Page 24

TC- 446 Service Manual

－ 22 －

Part List 1

No. P/N Material Name Qty. Ref. No. Address

353 C32 B5E 354 C33 B5F 355 C35 B4F 356 C36 B4E 357 C42 B4G 358 3101054720000 Chip capacitor 0402 4700PF K 5 2 C232 T4F 359 C57 B4D 360 3101054730000 Chip capacitor 0402 0.047UF K 5 C157 T5F 361 C158 T4E 362 C161 T2C 363 C162 B3C 364 C237 T3E 365 3101055610000 Chip capacitor 0402 560PF K 50 2 C171 T5F 366 C34 T5G 367 3101055620000 【switch to 3101055620010】SMT 1 C47 B3D 368 3101057590000 Chip capacitor 0402 7.5PF(±0.1 1 C89 B4I 369 3101058200000 Chip capacitor 0402 82PF J 50V 1 C58 B4C 370 3101060100010 Chip capacitor 0603 1PF B 50V 1 C92 B2C 371 3101060200010 Chip capacitor 0603 2PF B 50V 1 C93 B4E 372 3101060600010 Chip capacitor 0603 6PF B 50V 1 C145 B4J 373 3101061020000 Chip capacitor 0603 1000PF K 5 4 C198 T4G 374 C235 B4J 375 C63 B1D 376 C72 B3D 377 3101061040010 Chip capacitor 0603 0.1UF K 16 4 C194 T4H 378 C48 T4G 379 C49 T4G 380 R200 B2B 381 3101061800000 Chip capacitor 0603 18PF J 50V 2 C19 B5H 382 C506 B3I 383 3101064710000 Chip capacitor 0603 470PF K 50 2 R111 B4E 384 R150 B5F 385 3102992000040 Trimmer capacitor 3.2*2.5*1.25mm 5 TC1 B1D 386 TC2 B1C 387 TC3 B4G 388 TC4 B5F 389 TC5 B4E 390 3104071050020 Ta-capacitor 0805 1UF M 6.3V 6 C124 B1B 391 C200 T4E 392 C202 B3B 393 C85 B1G 394 C86 B1F 395 C87 B2G 396 3104081050000 Ta-capacitor 1206 1UF M 16V T 1 C174 T3F

Page 25

TC- 446 Service Manual

－ 23 －

Part List 1

No. P/N Material Name Qty. Ref. No. Address

397 3104081550000 Ta-capacitor 1206 1.5UF±20% 1 1 C112 T2G 398 3104081560030 Ta-capacitor 1206 15UF M 6.3V 2 C115 B2C 399 C177 T1D 400 3104082250030 Ta-capacitor 1206 2.2UF K 16V 1 C165 T5F 401 3104082260040 Ta-capacitor 1206 22UF M 10V 3 C118 T2E 402 C247 T3E 403 C248 T3E 404 3104084750030 Ta-capacitor 1206 4.7UF K 16V 2 C117 B1B 405 C173 T4F 406 3104201070000 Ta-capacitor 2220 100UF M 6.3 1 C203 T5G 407 3104204760020 Ta-capacitor C-packing 47UF M 16V T 1 C120 B2G 408 3210107221000 Framework inductor 0805 220nH LQW2 1 L4 B4J 409 3210108230010 Framework inductor 1206 23nH LQW31 2 L16 B2B 410 L44 B1E 411 3210209102010 Framework inductor 1210 1uH LQH32M 1 L43 B5J 412 3210305150010 Multi-layer inductor 0402 15nH LQG15 1 L21 B3G 413 3210305180000 Multi-layer inductor 0402 18nH LQG15 1 L26 B2B 414 3210305220000 Multi-layer inductor 0402 22nH LQG15 3 L18 B2D 415 L19 B2D 416 L25 B3E 417 3212105101000 Multi-layer inductor 0402 100nH HK10 4 L17 B1C 418 L40 B5E 419 L47 B2C 420 L48 B1C 421 3212105470000 Multi-layer inductor 0402 47nH HK100 2 L39 B5E 422 L45 B2D 423 3212106339000 Multi-layer inductor 0603 3.3nH HK16 1 L29 B3H 424 3213212102000 Multi-layer inductor 1008 1uH NLV25T 1 L50 425 3213212331000 Multi-layer inductor 1008 330nH NLV2 1 L49 B3E 426 3213306102000 Multi-layer inductor 0603 1uH MLF160 1 L14 T4H 427 3213306221010 Multi-layer inductor 0603 0.22uH MLF 1 L41 T2E 428 3213306332000 Multi-layer inductor 0603 3.3uH MLF1 2 L46 B2C 429 L5 B2E 430 3221506601000 Chip ferrite bead 0603 600Ω±2 5 L12 B3G 431 L13 B2B 432 L6 B2D 433 L7 B2D 434 L8 B2A 435 3221507221000 Chip ferrite bead 0805 220Ω±2 1 L11 B3H 436 3221507600000 Chip ferrite bead 0805 60Ω±25 2 L10 B3J 437 L15 B2G 438 3231321050000 Air-core inductor E2 0.32*1.0*5TR 1 L2 B3H 439 3231351630000 Air-core inductor E2-0.35*1.6*3TR 9 L22 B4H 440 L23 B4I

Page 26

TC- 446 Service Manual

－ 24 －

Part List 1

No. P/N Material Name Qty. Ref. No. Address

441 L24 B4I 442 L28 B4J 443 L33 B4G 444 L34 B5E 445 L35 B4E 446 L36 B4E 447 L38 B5F 448 3231351640000 Air-core inductor E2-0.35*1.6*4TL 2 L31 B4F 449 L32 B4G 450 3231351680000 Air-core inductor E2-0.35*1.6*8TR 1 L30 B3I 451 3303010500290 Switch diode 1SS372(TE85L.F 1 D18 T4F 452 3303020100020 Switch diode MA2S11100L SS- 2 D25 453 D9 B2C 454 3303020100070 Switch diode MA2Z07700L SOD 1 D11 B4I 455 3303020100080 Switch diode MA2S07700L 1.7 3 D12 B5H 456 D5 B3F 457 D6 B3F 458 3303030100010 Switch diode DAN222(TL) SOT 1 D19 T4G 459 3303210200000 Switch diode MA2S37600L SS- 4 D2 B2E 460 D3 B2D 461 D7 B1C 462 D8 B1C 463 3307110100080 LED KPT-1608SGC ultra-high 1 D22 T3J 464 3307110100070 LED KPT-1608SRC ultra-high 1 D24 T3J 465 3399990000160 Varactor MA2Z36000L 30V 1 D4 B1D 466 3399990000220 Diode UDZ3.0B SOD-323 1 D10 B2B 467 3401001000080 Transistor 2SA1362-ER（TE85. 1 Q40 T3F 468 3401002000990 Transistor 2SC5108-Y(TE85L. 3 Q13 B2B 469 Q14 B2D 470 Q22 B4D 471 3403007000000 Transistor DTA114EE(TL) PNP 1 Q10 B4D 472 3403007000020 Transistor DTA114YE(TL) PNP 2 Q34 T2B 473 Q9 T2B 474 3403008000010 Transistor DTC114EE(TL) NPN 3 Q28 B2J 475 Q30 B2J 476 Q35 T2B 477 3403008000070 Transistor DTC144EE(TL) NPN 2 Q12 T2F 478 Q39 T2F 479 3403009000010 Transistor UMG3N(N-TR) NPN 2 Q1 B1F 480 Q2 B2F 481 3404002000000 Transistor PRF957 NPN PHILI 1 Q16 B1D 482 3406001000090 Transistor 2SC4988FRTR-E NP 1 Q17 B3G 483 3408002000030 Transistor 2SC4226-R24-A NP 1 Q15 B2D 484 3411002000020 Transistor 2SC5343EG NPN AU 6 Q18 B2D

Page 27

TC- 446 Service Manual

－ 25 －

Part List 1

No. P/N Material Name Qty. Ref. No. Address

485 Q19 B4A 486 Q20 B4A 487 Q24 T5F 488 Q25 T5F 489 Q26 T4G 490 3499000000140 Transistor 2SK508-K52-T1B-A 1 Q8 B2C 491 3499000000150 Transistor UMC4(NTR) NPN/PN 1 Q7 B1D 492 3499000000180 Transistor UFMMT717 PNP SOT 2 Q4 B1F 493 Q5 B1F 494 3501020000030 FET 3SK318YB-TL-E-Q 2 Q23 B3E 495 Q27 B5E 496 3503010000010 FET 2SJ243-T1-A P-c 1 Q6 B1C 497 3503020000010 FET 2SK1588-T1-AZ N 1 Q41 T3F 498 3503020000030 FET 2SK1824-T1-A N- 3 Q21 B5B 499 Q46 B2E 500 Q50 B4I 501 3503040000000 FET UPA572T-A N-cha 1 Q3 B2G 502 3504990000010 FET RD01MUS2-T113 P 1 Q32 B3G 503 3504990000020 FET RD07MVS1-T112 P 1 Q31 B3I 504 3602028004610 AF amplification IC KIA6278F-EL/P 1 IC8 T3E 505 3603002005440 IF processing IC TA31136FNG(EL 1 IC1 B4C 506 3603008005040 Operational amplifier NJM2902V 4 OA J 1 IC7 B3C 507 3604002055090 PLL TB31202FN-EL(ELP 1 IC2 B2A 508 3605008005010 Operational amplifier NJM2100V 2 OA J 1 IC3 T4F 509 3608015000000 Power managing IC (voltage regulator) XC6201P5 1 IC4 T1D 510 3609004005280 Reset IC PST9140NR MITSU 1 IC9 T2A 511 3610045000040 SCM M38223M4A-137HP# 1 IC11 T3C 512 3612031004400 Memory AT24C08AN-10SU-2 1 IC5 T5B 513 3701012850010 TCXO 12.8MHz NSA0 1 X2 514 3701737230020 Crystal 7.3728MHz DSX530G 1 X3 T3B 515 4100500101600 TC-500US(U) PCB FR4 1 516 3104081060080 Ta-capacitor 1206 10UF M 10V 4 C1 B4B 517 C125 B4F 518 C155 B4A 519 C159 B3B

Page 28

TC- 446 Service Manual

－ 26 －

Adjustment Description

The radio can be adjusted with PC programming software or by manual adjustment. Manual adjustment procedure of TC-446 is as follow. (Refer to “model set mode”and “manual adjust mode”in the section Software Specification.) Instrument:

Radio CommunicationTestSet 1 set Scanner 1 set 3A/10V Power Supply 1 set Digital Voltmeter 1 set 3AAmmeter 1 set

 Adjustment:

1. Initializing: It’s necessary to set the model and initialize the radio before alignment because there is no needed information in EEPROM when the radio is manufactured. Please refer to the “model set mode”in the section Software Specificationfor details.

2. Adjustment: Some items can be adjusted in conventional communication mode and the others in manual adjust mode. Turn on the power, the radio enters conventional communication mode. If manual adjust mode is enabled, turn on the power while holding down PTT and MONI simultaneously, the radio enters manual adjust mode after 2 seconds. (Refer to the section Software Specification.)

 VCO

Item Condition

Measurement Adjustment Specification

/RemarksTest Instrument Terminal Part Method

1.Power supply 1.power voltage DC 6V

2.Transmit VCO lock voltage

1.TX High. Turn to CH15 in manual adjust mode and press PTT.

Digital Voltmeter CV

TC1

2V±0.1V V

2.TX Low. Turn to CH14 in manual adjust mode and press PTT.

2V±0.1V

3. Receive VCO lock voltage

1.RX High. Turn to CH15 in manualadjust mode.

TC2

2V±0.1V

2.RX Low. Turn to CH14 in manualadjust mode. 2V±0.1V

Page 29

TC- 446 Service Manual

－ 27 －

 RECEIVER: (Enter the manual adjust mode)

Item Condition

Measurement Adjustment

Specification

/Remarks

Test

Instrument

Terminal Part Method

Band Pass

Filter

1.RX Center. Turn to CH13 in manual adjust mode.

Scanner ANT . TP2

TC3 TC4 TC5

Adjust the waveform to the

top, and the top is flat,

the

bandwidth is about 100k

Hz,

the sign of RX central

frequency is at the of the waveform.

5.sensitivity

1.RX Center. Turn to CH13 in manual adjust

key to switch N/W).

Radio

Communicati

on Test Set

118dBm

MOD:1K

±1.5kHz

(Narrow)

FILER:

0.3-3.4kHz

ANT

Speaker Jack

Check

SINAD: 12dB or higher

2. RX Low. Turn to CH14 in manual adjust mode ( key to switch N/W).

3.RX High. Turn to CH15 in manual adjust mode ( key to switch N/W).

6.Squelch

1.RX Center. Turn to CH2 in manual adjust mode. Adjust by pressing PTT or MONI.

Radio Communication Test Set SSG output

-117dBm

ANT

Speaker Jack

Level 9

Adjust to just close the squelch.

Adjustsquelch level 9

2.RX Center. Turn to CH3 in manual adjust mode. Adjust by pressing PTT or MONI.

Radio Communication Test Set SSG output

-125dBm

Level

Adjust to squelch.

Adjustsquelch level3

Page 30

TC- 446 Service Manual

－ 28 －

 Transmitter

Item Condition

Measurement Adjustment

Specification /Remarks

Test equipment

Terminal Parts Method

7.Transmit frequency

1. TX Center. Turn to CH13 in manualadjust mode and press PTT.

Radio Communication

Test Set

ANT TC6

Adjust it to center

frequency

Error ≤±250Hz

8.Max. Deviation

1. Turn to CH13in manual adjustmode and press PTT (long press MONI key to switch N/W).

Radio Communication

Test Set

LPF: 15kHz

AF:1kHz 120mV

MIC Jack

VR2

Adjust deviation to:

2.0kHz±200Hz (narrow)

Sensitivity

1. Turn to CH13 in manual adjustmode and press PTT (long press MONI key to switch N/W).

Radio Communication

Test Set FILTER:

FILER:

0.3AF:1kHz 12±2mV

MIC Jack

Check deviation:

1.5±0.15 kHz(narrow)

10. CTCSS Balance

1. CTCSS: 67.0Hz. Turn to CH4 in manual adjust mode.

Radio Communication

Test Set

HPF: 20Hz

LPF:300Hz

ANT VR3

Adjust VR3,

tested on condition 1 and

condition consistent, the difference ≤200Hz

67.0Hz CTCSS

2. CTCSS: 250.3Hz. Turn to CH16 in manual adjust mode and press PTT.

250.3Hz CTCSS

11. CTCSS Deviation

1. TX Center. Turn to CH4 (wide) and CH4 (narrow) in manual adjust mode. Adjust by pressing PTT or MONI.

Radio Communication

Test Set

HPF: 20Hz

LPF:300Hz

ANT

Adjust deviation to

0.4kHz±100Hz(Narrow)

12. CDCSS Deviation

1. Turn to CH5 (wide) and CH7 (narrow) in manual adjust mod Adjust by pressing PTT or MONI.

Adjust deviation to

0.4kHz100Hz(Narrow)

13. low

Power

power voltage DC 6V

Radio Communication

Test Set

ANT 500±200mW

14.

Low Battery

Alert Level

1. Turn to CH1 in manual adjust

mode. Adjust the power supply voltage at 5.3V.Adjust by pressing PTT or MONI.

Digital Voltmeter

Adjust the level to make LED just flash.

Note:In manual adjust mode, when channel selector knob is positioned at channel 1-channel16, MIC jack can’t connect with external cables. After adjustment is completed, short out the two SELF points and then turn the power on, the radio enters model set mode. Then press PTT to disable the manual adjust mode.

Page 31

TC- 446 Service Manual

－ 29 －

TC500 Series Troubleshooting Chart

I. Receiver:

1. No receive or low RX sensitivity / intermittent RX output:

- Y

Y N Y

Adjust TC3, TC4, TC5; Check TC3, TC4, TC5, C94, C93, C106, C163, C164, C105;

Inject 21.4MHz signal into Q22 pin C; SSG output ≤

-92dbm;Audioheard

Inject 21.4MHz signalinto XF1 IN; SSG output≤

-103dbm; Audio

Check CF1(455K2nd IF filter), IC1(IF IC), X1(20.945M 2

LO), CD1(demodulator);

CheckXF1 (1

IF filter),Q22; Replacefaulty components.

signal into Q27(RF AMP)IN; SSG≤-113dbm;

Power supply at Q9(5R) OK?

Check Q23 (mixer), Q27, Tc5; Replace

no-solder joint at IC11 pin 23; Check Q9; Replace faulty components.

signal into antenna (wide: SSG≤

-118dbm,narrow: SSG≤-116dbm);

Page 32

TC- 446 Service Manual

－ 30 －

Repair Example：(Tested by communication test set after power on)

1) Symptom:TX OK; no RX at all, but RX frequency OK; no-solder at one end of crystal X1; Cure: touch up X1

2) Symptom:TX OK; low RX sensitivity or intermittent RX output;

Cure: replace 455KHz filter

3) Symptom:TX OK; low RX sensitivity, but sensitivity OK after injecting 45.05MHz signal into XF1;

Cure: adjust TC3, TC4, and TC5 in turn

2、No RX audio output（no audio from SPK, sound abnormal）：

Symptom 1: no audio after power on/no or low audio in monitor mode：（activate power-onalert tone and monitor features）

Page 33

TC- 446 Service Manual

－ 31 －

N Y

Y N

N Y

Start

Turn to max. VOL; Hold down MONI; around 2.8V (limit) audio output at SPK plug?

Check SPK plug, SPK, spring; Replace faulty components;

1 KHz audio input at IC8(AF AMP) pin1?

Check VR1 and its wiring to IC8; Replace faulty components.

Hold down MONI; 6V voltage at IC8 pin8?

Hold down MONI; 5V output at IC11 pin40 (AVP)?

Audio output at IC8 pin 7?

Check if Q39 and Q12 conductive; Replace faulty components.

Check C203, c239; Replace faulty components.

See control section troubleshooting

Check R203, R37, C84, C66;

Check IC8 and peripheral components; Replace faulty components.

Q41 conductive?

Page 34

TC- 446 Service Manual

－ 32 －

Symptom 2: audio OK after power on, no RX audio output or audio distortion in RX (abnormal noise output while holding down MONI)

Y N

Repair Example:

1) Symptom: Hold down MONI, MONI LED glows but no noise output (no RX audio), SPK resistance

OK; 6V measured at Q40 IN, but no 6V output while holding down MONI; Cure: replace Q40（2SA1362）

2) Symptom: Hold down MONI, 6.0V voltage at IC8 pin8 but no audio output at pin7;

Cure: replace IC8

Start

Hold down MONI; Audio output at IC7 pin1?

Check if Q21 conductive; Check operating status of

Q19, Q20; Check C44, C150, C151, C152, C153, C45; Replace

faulty components.

Hold down MONI; Audio output at IC7 pin3?

5V voltage at

5V voltage at IC1(IF) pin4?

Check IC7, IC11, peripheral components; Replace faulty components.

Check the components betweenQ9 and IC11 pin

23. Replace faulty components.

Check the wiring betweenIC1 pin4 and Q9;

Check IC1, CD1 (C24 demodulation), peripheral components; Replace faulty components.

Page 35

TC- 446 Service Manual

－ 33 －

II. Transmitter：

1、No power (low output power)

Y N

Start

Plug into standard power supply (7.5V); Connect instruments; Toggle on TX; Observe current&power changes.

Low current and no power output in TX

High current but no or low power output in TX

In TX, 6.0V source voltage

at Q31?

In TX, around

1.1W power at D11positive end?

In TX,

1.8~2.5 V gate voltage

at Q31?

Check Q32, Q17, Q38, peripheral components; Replace faulty components.

source voltage and 1.8~2.5V gate voltage at Q32?

Check C30, C139, C142, C141, C145; Replace faulty components.

Check D11, R75, C208, L4

Check bias circuit;

Replace Q31;

Check L3, Q31, C55;

In TX, around 1.1W power at D11 negative end?

Page 36

TC- 446 Service Manual

－ 34 －

否

Replace faulty components;

Check bias resistor and TX 5V power supply circuit.

Replace faulty components;

C207 OK?

Replace faulty components;

C23 parameters and D5 positive bias OK ?

Replace faulty components; Check bias circuit.

4V collector voltage,

1.8V base voltage and 1V emitter voltage at Q15?

Check R80, L18, R34, R29, R79,

OK ?

Replace with components of the same spec;

See VCO Troubleshootin

R122, C98, R196, C42 R195 OK?

In TX, 4.8V collector voltage,

1.2V base voltage and 0.3V emitter voltage at Q17?

L29, C138,

C67 OK?

Page 37

TC- 446 Service Manual

－ 35 －

Repair Example：

1) Symptom: no TX power; > 3ATX current; Cure: replace Q31

2) Symptom:low TX power; Voltage at Q4, Q31, Q32 OK; 10mw power at Q31（RD07）IN; Around 1W power at D11; Cure: replace Q31

2、No or low TX audio (test port for communication test set：AF OUT/AF IN)

是 N

Y N

Start

Inject 1KHz/100mv AF signal into MIC plug; ± 4.2KHz ± 150Hz modulation deviation?

Check MIC plug and MIC; Replace faulty

Waveform input at IC3(NJM2100V) pin2 OK?

Check L14, C48, C169, C168; Replace faulty components.

In TX, amplified waveform output at IC3 pin7?

In TX, 5V voltage at IC3

In TX, waveform output at VR2?

Check IC3 and peripheral components;

Check the connection to Q4 C pin.

Check components between VR2 and VCO (e.g.L10, R22, C40); replace faulty components;

Check Q24, Q25, VR2 (47K) and peripheral components;

Page 38

TC- 446 Service Manual

－ 36 －

Repair Example：

1) Symptom: no TX audio, cracked VR2; Cure: replace VR2 and adjust

2) Symptom: low TX audio; poor modulation sensitivity of MIC after adjusting VR2 Cure: replace MIC

II. PLL： 1、 TX or RX unlock：(Caused by faulty oscillator loop)

Page 39

TC- 446 Service Manual

－ 37 －

Start

Correct software mode settings and freq range?

TX unlock: TX unlock on some channels?

RX unlock: RX unlock on some channels?

No TX CV

or<0.8V?

Check synthesized sector;

Bias (pinC 4V)

AdjustTC1;reliable solder&correct parametersofC182, C193, C95,L44, C192, C90,L5,D4?

AdjustTC2;reliable solder&correct parametersofC186, C187, L46,R69, L16,C19,C188,

L48,D8,D7,L17?

Check synthesized sector;

or<0.2V?

Bias (pinC 4V)

4.1Voutput

Reliablesolder andcorrect parametersofR164,R9,L47,Q8?

IC11pin31?

CheckIC11, peripheral components;or

Reliable solder at Q7, R53; No disconnected

wiringto branch circuit?

4Voutput voltageat Q6?

Reliablesolder at R171? No disconnectedwiringto

IC11pin31?

Reliablesolder atPTT? Nodisconnectedwiring toIC11branchcircuit?

Check the value and soldering of Q6、R9. Replace faulty

components.

CheckR11,L19,R74,Q13; Replacefaultycomponents.

Voltage at

TX CV?

Voltage at

RX CV?

Adjust TC2

Adjust TC1

Adjust to freq band/freq set in the radio;

N N

No RX CV

Page 40

TC- 446 Service Manual

－ 38 －

1、 TX and RX unlock：（Caused by faulty common sector）

Y N

N Y

Start

Correct software mode settings and freq range?

Adjust to correct software mode and freq;

4.9V at IC2 pin2 ?

5V output at

Q5(5C)?

Check L13, R191, C113, C117, C123; Replace faulty components.

In non-battery-sa ve mode, 5V (H level) at IC11pin6 ?

Bad soldering joints at IC11 pin6? Correct software settings? If not, replace IC11.

Check Q3, R65, Q2, R28, R66; Replace faulty

12.8MHz at IC2 pin13?

Check 12.8MHz crystal, C130, TC6; Replace faulty

After amplified by Q13,

VCO output

Check VCO circuit

Data, clock, strobe pulse at IC

pin8/9/10 OK?(triangle wave)

Check CP6, CPU, C15, C16, C17 and wiring;

1-4V CV control voltage (output)？

Check the soldering and value of the components between IC2 pin 3 to CV. Check the soldering of IC2. Replace faulty components.

High level at D13positive end ?

Page 41

TC- 446 Service Manual

－ 39 －

Repair Example：

1) Symptom:unable to transmit even if PTT is pressed; wrong freq band found when reading from radio

via PC;

Cure: correct the freq band

2) Symptom:unable to lock freq, TR accessible sometimes, occasional TX or RX unlock; Cure: replace Q15(5108)

3) Symptom: unable to transmit even if PTT is pressed; freq range found OK when reading from radio

via PC; no 5V output at Q5; Cure: replace Q5（717）

4) Symptom: unable to transmit even if PTT is pressed; freq range found OK when reading from radio

via PC; 5V output at Q5; 5C voltage at X2 (12.8 crystal oscillator); Cure: replace X1

5) Symptom: able to transmit when PTT is pressed; freq range found OK when reading from radio via

PC; 5C voltage OK; Voltage found at CV in RX but not within 0.8~4V; Cure: adjust TC2 to make CV within normal range

6) Symptom: Power-on OK; unable to lock freq when pressing PTT, TR accessible sometimes,

occasionalTX or RX unlock; Cure: replace Q15(5108)

Page 42

TC- 446 Service Manual

－ 40 －

VI. Power Supply：

Fail to power on (no response while rotating power knob after plugging in power supply)

Plug positive end of power cable into positive connector while negative end into aluminum chassis or ground around PCB;

Turn off radio; 6.0V output at L15 Upper?

Check L15, C149, C120; Replace faulty

components.

Switch on power;

6.0V at IC4 IN?

Check power switch, D20, IC4; Replace

faulty components.

5V at IC4

Check if short circuit occurs when IC4, C80, C79, branch circuit are grounded; Replace faulty components.

Check IC11 pin 71/ 72; 5V at IC9 pin 5 (RESET)?

Check if no-solder at IC11and branch components; Replace

Start

Check IC11, X3 (7.3728 MHz crystal), peripheral R&C; Replace faulty

Page 43

TC- 446 Service Manual

－ 41 －

Repair Example：

1) Symptom: Plug in 6.0 power cable, rotate power knob but unable to switch on power; voltage at L15

OK; no 7.5V at IC4 IN; power knob OK; Cure: replace D20

2) Symptom: Plug in 6.0 power cable, rotate power knob but unable to switch on power; Voltages at

L15, IC4 IN OK; no 5V (5M) voltage at IC4;

Cure: replace IC404

3) Symptom: Plug in 6.0 power cable, rotate power knob but unable to switch on power; 5V output at

IC4; Voltage at IC9 OK;

Cure: replace X3 （7.3728MHz crystal）

Page 44

TC- 446 Service Manual

－ 42 －

Disassembly and Assembly

 Remove the Battery

1. Turn the radio off.

2. Slide the battery latches upwards.

3. Pull the top part of the battery away from the radio’s body and lift the battery from the radio. (See figure 1)

Figure 1

 Disassemble main unit (aluminum chassis and PCB)

1. Remove the two screws at the base of the chassis.

2. Pull the volume knob and selector knob off.

3. Remove the antenna at top of the radio.

4. Remove the screw of the microphone jack cover and pull the jack cover off. (See figure 2)

Figure 2

Page 45

TC- 446 Service Manual

－ 43 －

Pull the chassis upwards and then pull the chassis away from the front cover. (See figure 3)

Figure 3

The disassembly is shown as the figure 4.

Figure 4

 Disassemble PTT button

Push the PTT button in indicated direction until out of the cover. (See figure 5)

Figure 5

Page 46

TC- 446 Service Manual

－ 44 －

 Assemble PTT button

Paste double-coated tape to the cover.And then press the PTT button into the corresponding opening in the cover. (See figure 6)

Figure 6

 Attach the battery

1. Fit the extensions at the bottom of the battery into the slots on the radio chassis.

2. Press the top part of the battery towards the radio until a click is heard. (See figure 7)

Figure 7

Page 47

TC- 446 Service Manual

－ 45 －

Exploded View

Page 48

TC- 446 Service Manual

－ 46 －

Part List 2

No. P/N Description Qty.

A 7102506000020 Machine screw M2.5*6.0mm 1 B 7102004020050 Self-tapping screw ST2.0*4.0mm Cross recess pan head (color zinc plating) 11 C 7102009001000 Machine screw M2.0*9.0mm (color zinc plating) 2 D 7102505000100 Machine screw M2.5*5.0mm T9 hexagonal head 2

1 6000051000010 TC500 Rear cover Black ABS700 1 2 6000374000000 TC308 Antenna cap Black TPUS95A 1 3 6100237000000 TC366 Antenna housing Black 85 degree TPU 1 4 7400018000000 TC446 PVC piece at main unit front case antenna hole 1 5 7000014000000 TC2110 Antenna core Ф 3.60mm (red copper plating)

6 6300007000030 TC446 Aluminum chassis Grinding ADC12 1 7 7500114000000 TC500 Cooling pad 2.00mm-thick Gap Pad1500 8.0*6.6mm

8 6100034000000 TC-500USWater-proof gasket Black 40 degree high-tensile silica rubber 1

9 7500013000000 TC2100 Positive electrode piece water-proof sponge 1.5mm-thick EVA 1 10 6201030000000 TC-500 Battery positive electrode piece 0.20mm SUS301 (nickel plating) 1 11 6000046000000 TC2100 Positive electrode piece support Black ABS 1 12 7207002200000 Nut M7.0*2.2mm 1 13 4303020000030 Volume switch TC-1688 1 14 7206002500010 Nut M6.0*2.5mm 1 15 4302030000010 Channel switch TC-368 RY-6933 tocos 1 16 4301040000020 PTT switch TC-278/TC-378 SKHLLBA010 ALPS 2

17 7400034000000

TC370 Speaker insulating pad 1.0mm-thick EVA Φ 17mm single-side

self-adhesive tape 1 18 5001010000020 Speaker 426539(036S23) 4Ω 0.5W D：36mm FOSTER 1 19 6000160000040 TC-368S Volume knob Black PC+ABS 1 20 6000158000040 TC-368S Channel knob Black PC+ABS 1 21 6201006000000 TC2088 Inner liner (knob) 0.25mm SUS304 2 22 6000050101000 TC500 Main unit front case Black HYTABS700 1 23 6100030000010 TC-500 PTT key Black 60 degree silica rubber 1 24 7400016000000 TC500 Mic mesh Unwoven cloth 0.3mm-thick Φ5.0 1 25 6000189000000 TC3000 Light guide Transparent PMMA 1 26 6000054000000 TC500 Mic cover Black ABS 1 27 7400075000000 TC500 Speaker mesh Unwoven cloth 0.05mm-thick Φ36 1

Page 49

TC- 446 Service Manual

－ 47 －

28 6100075000000 TC-368 Mic gasket Black 30 degree silica rubber

29 5002110000030 Mic CZII-64AP-RoHS -60dB±2dB φ9.7*4.5mm 1 30 4210080000000 Lead with tin on both ends 80mm Black

31 4210080000300 Lead with tin on both ends 80mm Red 1 32 5205000000280 Speaker jack HSJ1456-010320 1 33 5205000000190 Earpiece jack HSJ1650-010020 1 34 7400133000000 TC500 PVC water-proof gasket PVC 0.3mm-thick Φ4.7 2 35 7500115000000 TC500 Battery contact pad Silica rubber 4.8*4.2mm 2 36 6201022000000 TC2100 Battery negative electrode piece 0.20mm SUS301 (nickel plating) 1 37 7400014000010 TC-500 Battery water-proof PVC piece 0.2mm-thick PVC 18.40*16.10mm 1 38 6000039000000 TC2108 Battery latch Black PC+ABS 1 39 7000015000000 TC500 Latch spring Ф 3.00×7×Ф0 .35mm 1

Page 50

TC- 446 Service Manual

－ 48 －

Packing

Page 51

Page 52

Page 53

1 2 3 4 5 6 78

7654321

MODEL

FILE NO. REV

HYT Science & Technology Co. Ltd.

Part Name

DRAWN BY CHECKED

APPROVAL

PAGE

DATE

Error : HYT.jpg file not found.

M38223M4H

IC11

B+

POWER1

FILO

678

QUAD

FILI

IFO DEC

1213141516

54321

OSCI

OSCO

MIXO

VCC

IFIRSSI

NDET

NRECEMIXI

IC1

TA31136FN

10u/10V

0.01u

680K

C13

220PR32.2K

C14 220P

100k C18 27P

C20 470P

R25

3.3K

C37

0.1U

OUT

CF1

C52

33P

20.945MHz

C53 33P

0.01U

R36 10K

L1 470

R26

3.3K

C57

4700p

C58

82P

CD1

R47

820

0.01U

C38

0.1U

C54 33P

SYSTEM

Q1 UMG3N

UMG3N

UPA572T

FMMT717

C59

1000P

R51

R27

3.3K

R28

3.3K

C60

1000P

0.01u

R64 2.7K

R652.7K

C87

1u/ 6.3V

R52

C61

1000P

C62

1000P

R66

820

3.3U

D2 MA2S376

D3 MA2S376

C88 10p

601S

C90 7P

MA360

TC1 10P

C182

C193 8P

R67

330

C91

0.5P

C96 6P

C100 22P

C97 6P

MA2S077

R70 680

C103 3P

C63

1000P

2SJ243

UMC4 R105 47K

D7 MA2S376

C19 18P

2SK508NV

R8 100K

100K

R53

L7 601s

TC2 10P

L16

23nH

C189 5P

C186

L48

100N

R72 120K

R74 100

R29

3.3K

R79

5.6K

C21

470P

R68

150

C22 470P

L18 22n

L19 22n

R80 10

R30

3.3K D6

MA2S077

R31

3.3K

C24

470P

R82

R69 150

C92 1P

0.01U

C109

1000p

MA2S111

R84

4.7K

C110

1000p

C115

15u/6.3V

L17 100n

C65

1000P

MA2S376

DTA114YE

R10

100K

Q10

DTA114EE

C39

0.1U

R113

R114

2.7k

R115

R117

8.2K

C124

1u/6.3V

601s

C25 470P

R56

Q13

2SC5108

R11

120K

R38 10K

TP1

Q14

2SC5108

Q15

2SC4226

Q17 2SC4988

Q18

2SC5343(s)

C98

C42 470P

C27

470P

C111

1000p

C134

C28

470P

C137

0.01u

C101

6.8

C67

270P

C147 1000p

C102

0.5P

C55 15P

C29

470p

C138 33P

C68

1000P

L21 15nH

L22

L2 5T

L23

L30 8T

L3 0

L314T

L32 4T

L33 3T

L24 3T

0.22uH

R122

330

R123

R75 100

D11

MA77

C139

7.5

C140

0.75

C141 11P

C142 11P

C143

0.75P

C30 470P

D12

MA2S077

L11

221SG

C231

470p

C31

470P

L12

601S C113 1000p

L13 601s

C117

4.7u/16V

C149

470P

C43

0.1U

C44

0.022U

C150

0.033U

C151

0.033U

C152

0.033U

C153

0.033U

C45

0.1U

R130

5.6K

Q21

2SK1824

R132 27K

R134

680K

R97 82K

C69

1000P

R12 100K

R135

3.3K R139

150K

R140 150K

R136

3.3K

C155

10u/10V

R137

3.3k

R141 150K

R142 150K

R138

3.3K

C70

1000P

0.01U

C156

0.018u

C71 1000P

R57 1K

R107

R39 1K

R13 100K

R14 150K

C197

470p

C159 10u/10V

C46

0.1U

C47

5600pF

270K

R15

100K

R16 270K

R98 20K

C160

0.033U

C162

0.047U

C72

1000P

R144

1.8K

Q19

2SC5343(s)

Q20 2SC5343(s)

Q22

2SC5108(Y)

R146 330

XF1

C99 NC

R108

R48

1.5K

R147 100

R148 560K

R49

2.7K R625

100K

R5 330

Q23

3SK318

L37 NC

C73 1000P

C56 NC

C74

1000P

C135

10P

L25

22n

R40 10K

TP1

21.4M

MIXER

VR1

C163

0.5P

C104 1P

C105 3P

R150 470P

C164

0.5P

R145

100K

C165

2.2U/16V

R33

3.3K

Q24

2SC5343(s)

R152 39K

R41 10K

R155

1.8M

R42 10K

R156

1.8M

R157 56K

R158 39K

R85

6.8K

R159 39K

R153 39K

0.01U

C166

3300P

C167

0.022U

C157

0.047u

C171

560P

C172

2700P

C158

0.047U

C34

560P

C75

1000P

C10

0.01U

C144

10P

Q25

2SC5343(s)

IC3

NJM2100V

C168

0.022U

C169

0.022U

C48

0.1U

R131

1.8K R50

1.5K

R160 750K

R161 15K

R162 15K

R120 22K

R110 0

C173

4.7U/16V

C76

1000P

C49

0.1U

C77 1000P

C50

0.1U

D18 1SS372

C174

1U/16V

D19

DAN222

ACTIVE FILTER

Q26

2SC5343(s)

R163 15K

L14

1uH

R165

2.2K

R166 470

C125

10u/10V

C35 470p

Mic

MIC1

TC3 10P

TC4 10P

L38 3T

SPK/4Ω

VR2

47K

R58 1K

R18

100K

L41

0.22u R19 NC

R20 NC

R21 NC

L42

C175

33p

C176

33P

C78

1000p

R59

C79

1000P

OUT IN

GND

IC4

XC6201P502PR

D20

C80 1000P

C177

15u/6.3V

R167 220K

R22 470K

C81

1000P

R43 330K

R 6 0

1 K

R61

R99

4.7K

R121

4.7K

R87

4.7K

C170 NC

C11

0.01u

Q28

DTC114EE

C82

1000P

R44

10K

R62

470

Q30

DTC114EE

R118 470

R45 10K

C83

1000P

VCC

SDA

GND

TEST

SCL

IC5

AT2408

CP4 4.7K*2

CP5

10K*2

C15 100P

C16

100P

C17 100P

C180 100p

R63 NC

D13 NC

R143

C181 3900P

C161

0.047U

R133

82K

R88

4.7K

MONI

PTT

2.2K

ANT1

R89 1K

R90 100

C89

1.5P

L28 3T

C145

C146

2.4P

L43

C136

Q31

RD07

Q32

RD01

C132 100p

L44 23nH

C95

Q16

PRF957

C192

2.4P

R169

8.2k

R170

12K

R171 82

L45 47nH

R34

3.3k

C51

0.1u

C12

0.01u

R172 0

R173

R100

10K

R125 47

R101 47K

R102 27K

R103 56k

R104 22k

C114

1000p

VDD Vss

NJM2902

IC7

L46

3.3U

C187

10P

L47

100n

R164

C188 22P

L49 330N

C190 NC

C191

C178

0.1U

C85

1u/ 6.3V

MIC

J1 SPK

TXD

C120

47uF/16V

Q34

DTA114YE

R177

4.7K

R175 100K

R176 100K

R174

2.2K

C194

0.1uF

C196

1.5P

L26 18n

C195 2P

D22

RED

D24

GREEN

PST9140NR

IC9

C200

1u/6.3V

VR3 68K

R109 1M

R127

100

C32 470p

R32

3.3k

C33

470P

L34 3T

L39 47n

L35

L363T

L40 100n

Q27 3SK318

R151

R76 100

R111

470P

C106 6P

C932PC94

0.5P

C107

C108

TC5 10P

R77

R187

R182

R179 NC

R183

R178

R181

R186 NC

R78

R180

R184

C183

C185 NC

C184 NC

IC6 NC

Q36 NC

Q37 NC

R185

L10600sg

C116 NC

R83 NC

R191 47

R192

C126

0.33u

C127 NC

Q38 NC

L20 NC

R129

C23

R194 0

C207 470P

C133

0.33u

R197

R4 47K

R196

5.1

DC 6.0V

C208

470P

R198

120K

455kHz(H)

C198

1000P

L15

600sg

C204

470P

C112

1.5u/10V

R35 100K

CP1

10K*4

CP3

4.7K*4

C121 1000P

VR4

68K

R124

120K

R154 47k

C179 100p

C86

1u/ 6.3V

C230

L29

3.3nH

C123

0.22u

C66

1000P

R37

10K

Q12 DTC144EE

R55

1.5K

C122

0.039u

C203

100u/6.3V

R17 NC

C36

470P

Q40

2SA1362

C64

0.1u

R54

47K

Q39

R203

1.0K

C118 68uF/6.3V

C40

0.1u

Q41

2SK1588

R94 470K

R24 33K

R93 47K

C84

0.1u

IC8

R628

8.2K

C237

0.047U

R106 0

R112

KIA6278F

C239 220P

IC2 IB31202

916

CP6 10K*4

R602

R601

D25 MA2S111

VR6 NC

SELF

R508

C253

10P

C26

1000P

R96

330

C255

10P

C252

1000P

R128

47K

R202 0

R200

0.1U

R116

R81 3K

R204

10K

R205

C232

4700p

C233

0.1U

C235 1000P

C506

33P

R605

R604

C240

0.01U

C241

0.01U

C242

0.01U

C243

0.01U

R606

47K

R607

47K

R608 47K

R609 47K

1 2 3 412

5678

R610

47K

Q35 DTC114EE

RXD

Q46

2SK1824

C246

0.1U

R617

27k

C247

22u/6.3V

C248

22u/6.3V

C249

1 2 3 4

C250

0.1u

R619

820

R616

270

C251

470P

R149

56k

R626 100K

R627

56K

R623 100K

R624

100K

R618 68K

W/NC

Q47 NC

R615

47K

C202

1u/6.3V

VDD

OUT

GND

12.8MHZ

VR5 68K

L50

1UH

D10

BDZ3.0B

TC-446

Schematic Diagram

R622 18k

C254 2200P

August , 2005

Q50

Page 54

TC- 446 Service Manual

－ 52 －

Specifications

Frequency range

400 MHz ~420 MHz 450 MHz ~470 MHz 136 MHz ~150 MHz

150 MHz ~174 MHz Channel capacity (simplex) 16 Channel spacing 25KHz(wide)/12.5KHz(narrow) Antenna impedance 50Ω Microphone impedance 2KΩ Operation voltage 6VDC Frequency stability ±2.5×10

-6

Transmitter

Carrier frequency error ±2.5×10

-6

Carrier output power 4.0W (Hi)/2.0W(Lo) Modulation sensitivity 12±2mV Modulation distortion ≤5% Modulation limiting ≤5KHz(wide)/2.5KHz(narrow) Bandwidth ≤16 KHz(wide)/8.5KHz(narrow) Audio response From 6 dB/oct. Pre-Emphasis ±3dB Conducted spurious

emission

≤7.5μW

Adjacent channel power ≤-65 d B

Receiver

Reference sensitivity ≤0.25μV(wide)/0.35uV(narrow) Unsquelch sensitivity ≤0.4μV Audio power 400mW(4Ω) Audio distortion ≤5% Modulation acceptance ≥│±7 KHz│(wide)/ │±3.5KHz│(narrow) Audio response From 6 dB/oct. De-Emphasis +2dB -8dB Co-channel rejection ≥-8 d B Blocking ≥85d B Adjacent channel selectivity ≥60 d B(wide)/50dB(narrow) Spurious response rejection ≥60 d B Intermodulation rejection ≥60 d B(wide)/50dB(narrow)