Kenwood TK-3302 UHF FM Transceiver

Contents

• GENERAL - Page 2
• SYSTEM SET-UP - Page 3
• REALIGNMENT - Page 3
• DISASSEMBLY FOR REPAIR - Page 6
• CIRCUIT DESCRIPTION - Page 6
• PARTS LIST - Page 7
• EXPLODED VIEW - Page 15
• PACKING - Page 16
• ADJUSTMENT - Page 18
• PC BOARD - Page 24
• SCHEMATIC DIAGRAM - Page 28
• BLOCK DIAGRAM - Page 32
• LEVEL DIAGRAM - Page 34
• SPECIFICATIONS - Page 35

General Information

Document Copyrights

Copyright 2008 by Kenwood Corporation. All rights reserved. No part of this manual may be reproduced, translated, distributed, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, for any purpose without the prior written permission of Kenwood.

Disclaimer

While every precaution has been taken in the preparation of this manual, Kenwood assumes no responsibility for errors or omissions. Neither is any liability assumed for damages resulting from the use of the information contained herein. Kenwood reserves the right to make changes to any products herein at any time for improvement purposes.

Introduction

Scope of This Manual

This manual is intended for use by experienced technicians familiar with similar types of commercial grade communications equipment. It contains all required service information for the equipment and is current as of the publication date. Changes which may occur after publication are covered by either Service Bulletins or Manual Revisions. These are issued as required.

Ordering Replacement Parts

When ordering replacement parts or equipment information, the full part identification number should be included. This applies to all parts: components, kits, or chassis. If the part number is not known, include the chassis or kit number of which it is a part, and a sufficient description of the required component for proper identification.

Personal Safety

The following precautions are recommended for personal 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.
• This equipment should be serviced by a qualified technician only.

Service

This transceiver is designed for easy servicing. Refer to the schematic diagrams, printed circuit board views, and alignment procedures contained within.

Service Manual List

System Set-up

The following process outlines the system setup for transceiver programming:

• Merchandise received
• Choose the type of transceiver
• Transceiver programming requires a personal computer, programming interface (KPG-22/22A), and FPU (programming software). These are used to program frequency, TX power HI/LOW, and signaling data.

Optional Equipment

• Optional Antenna: KRA-23 or KRA-27
• Speaker Microphone: KMC-17, KMC-21 or KMC-45 (Option)

After setup, the unit proceeds to Delivery.

Realignment

Modes

• User mode: For normal use.
• PC mode: Used for communication between the transceiver and PC.
• Data programming mode: Used to read and write frequency data and other features to and from the transceiver.
• PC test mode: Used to check the transceiver using the PC (feature included in FPU).
• Wireless clone mode: Used to transfer programming data from one transceiver to another.

How to Enter Each Mode

• User mode: Power ON.
• PC mode: Received commands from PC.
• Wireless clone mode: Press and hold [PTT] + [Side2] + Power ON (for two seconds).

PC Mode

Preface: The transceiver is programmed using a personal computer, a programming interface (KPG-22/22A, USB adapter KCT-53U), and FPU (programming software). The setup involves connecting the transceiver to the PC via the interface cable and USB adapter.

Programming with PC

Data can be programmed into the EEPROM in RS-232C format via the SP/MIC jack. In this mode, the PTT line operates as TXD and RXD data lines respectively.

List of FPU for transceiver

Wireless Clone Mode

Outline: This mode copies transceiver data to another transceiver wirelessly. It is primarily for dealer use and can be performed without a PC. The clone source and target/s must be in wireless clone mode.

Operation:

1. To switch clone target/s to wireless clone mode, press and hold [PTT] and [Side2] keys while turning the transceiver power ON. Wait 2 seconds; the LED will light orange and the transceiver will announce "Clone".
2. Select a channel table number using Side1 (increment) and Side2 (decrement) keys.
3. To switch the clone source to wireless clone mode, repeat steps 1 and 2.
4. Press [PTT] on the clone source to begin data transmission. The target LED will light green during reception. A "confirmation" tone sounds upon completion. An "error" tone sounds if transmission fails.
5. If cloning fails, the target unit will have no data upon returning to User mode.
6. Upon successful cloning, "Scan" and "Key lock" functions reset to default (Scan = OFF, Key lock = OFF).

Clone Frequency Table

Notes on Wireless Clone Mode:

• Dealers can clone data to multiple transceivers.
• Wireless clone mode cannot be entered in battery low state.
• A unit cannot be a "Source Unit" if it is unprogrammed.
• Cloning language depends on "Model type" setting, not FPU setting.
• Once a unit is set as source, it cannot be a target.
• Electronic interference may cause data transfer failure.
• Wireless clone mode is for authorized service personnel only.
• The setting must be configured as "Disable" before delivery to the end-user.
• Replace antenna with a dummy load for cloning.
• Transmit output power is automatically set to Low in wireless clone mode.

Disassembly for Repair

Screw sequence for mounting the TX-RX unit to the chassis

Attach the TX-RX unit to the chassis using screws in the order shown in the diagram. The diagram shows the component side view of the TX-RX UNIT.

Circuit Description

1. Frequency Configuration

The receiver uses double conversion with a first IF of 38.85MHz and a second IF of 450kHz. The first local oscillator signal is supplied by the PLL circuit. The PLL circuit in the transmitter generates the necessary frequencies.

Figure 1: Frequency Configuration Diagram shows the signal flow and frequency generation. Key components include ANT, ANT SW, RF AMP, 1st MIX, MCF, IF SYSTEM, SP, AF AMP, TCXO, PLL VCO, MIC AMP, and TX AMP. The table below details the frequency ranges for different models:

Parts List

The Parts List details all components for the TK-3302, including capacitors, resistors, chip capacitors, chip resistors, and various assemblies and sub-components for the main unit and the TX-RX unit. Parts are identified by reference number, part number, description, and destination code. Parts with reference numbers larger than 700 are not supplied. Parts listed in shaded boxes on PCB diagrams are not included with the PCB and must be ordered separately.

Capacitors

Capacitor codes indicate type, shape, temperature coefficient, voltage rating, value, and tolerance. For example, 'CC45 TH 1H 220 J' decodes as:

• 1 (Type): Ceramic
• 2 (Shape): 45 (round)
• 3 (Temp. coefficient): TH (-470 ppm/°C)
• 4 (Voltage rating): 1H (10V)
• 5 (Value): 220 (22pF)
• 6 (Tolerance): J (±5%)

Capacitor values are indicated by a three-digit code (e.g., 220 = 22pF, 101 = 100pF). Multipliers are used for larger values.

Resistors

Resistor codes (e.g., 'RD 73 F E B 2B 000 J') indicate type, shape, dimension, temperature coefficient, rating wattage, value, and tolerance. Carbon resistors follow a similar coding scheme.

Detailed tables for capacitor and resistor values, dimensions, and rating wattages are provided.

Exploded View

The Exploded View diagram (Figure A-B) illustrates the physical assembly of the TK-3302 transceiver. It shows how various parts, identified by reference numbers, fit together. Parts with numbers larger than 700 are not supplied. Parts indicated in boxes on PCB diagrams are not included with the PCB and must be ordered separately.

Packing

The Packing sections detail the contents and arrangement for shipping different versions of the TK-3302:

• Packing (K2,K3,M2 TYPE): Shows the packaging for these models, including items like instruction manual, protection bag, belt hook, screw set, cap, charger, AC adapter, whip antenna, packing fixture, holder (SP/MIC), battery assembly, and item carton case.
• Packing (P TYPE): Details the packing for the P type model, including similar items but with variations in AC adapter and battery assembly.

Parts with exploded numbers larger than 700 are not supplied.

Adjustment

Test Equipment Required for Alignment

A comprehensive list of test equipment is provided, including Standard Signal Generator (SSG), RF Power Meter, Deviation Meter, Digital Volt Meter (DVM), Oscilloscope, High Sensitivity Frequency Counter, DC Ammeter, AF Volt Meter, Audio Generator, Distortion Meter, Spectrum Analyzer, Tracking Generator, 4Ω Dummy Load, and Regulated Power Supply. Each item lists its major specifications relevant to the TK-3302.

Antenna Connector Adapter

The transceiver uses an SMA terminal for its antenna connector. An adapter (SMA(f) – BNC(f) or SMA(f) – N(f)) is recommended for adjustment, though not provided as an option.

Repair Jig (Chassis)

A specific repair jig (Part No.: A10-4215-03) is recommended for servicing the transceiver, facilitating voltage checks and protecting the final amplifier FET.

Battery Jig (W05-1011-00)

A Battery Jig is available for proper power connection during servicing. Caution is advised regarding output voltage and polarity to prevent damage.

Note: A slight voltage drop may occur in the power cable during transceiver transmission when using the battery jig.

Frequency and Signaling

Tables detail the RX and TX frequencies for TK-3302 K2,M2 and K3 models, along with signaling numbers (None, Square Wave, QT, DQT, DTMF). These frequencies may require re-adjustment.

Preparations for Tuning the Transceiver

Before tuning, connect the unit to a suitable power supply. The transmitter must be connected to a dummy load (power meter). The speaker output connector requires termination with a 8Ω dummy load and connection to an AC voltmeter and audio distortion meter or SINAD meter.

Adjustment Frequency Tables

Specific tables provide test channels (Center, Low, High) with corresponding RX and TX frequencies for TK-3302 K2,M2 and K3 models. These are crucial for tuning procedures.

Spectrum Analyzer Screenshots

Figures 1-6 display spectrum analyzer outputs showing center, high-edge, and low-edge frequencies for K2,M2 and K3 models, illustrating the frequency response characteristics.

Adjustment Procedures

Detailed tables outline adjustment procedures for the Common Section, Transmitter Section, and Receiver Section. These include specific test equipment, conditions, methods, and required specifications.

PC Board

The PC Board section provides detailed diagrams of the TX-RX UNIT (X57-7580-XX) for different versions (-22: K2,M2; -23: K3). These diagrams include both the Component side view and Foil side view, with tables mapping reference numbers to their addresses on the board.

Schematic Diagram

The Schematic Diagram sections (pages 28-31) provide comprehensive circuit schematics for the TX-RX UNIT (X57-7580-XX). These diagrams illustrate the interconnections and components of the transceiver's circuitry.

Block Diagram

The Block Diagram sections (pages 32-33) offer a high-level overview of the TK-3302's functional blocks and their interrelationships. This includes sections for Battery, Power Switch, Voltage Regulator, PLL IC, MCU, Audio Processor, FM IF IC, and various RF and control signal paths.

Level Diagram

The Level Diagram (Page 34) illustrates signal levels at various points within the Receiver and Transmitter sections. It shows RF and AF signal levels, indicating expected values for sensitivity and output power measurements.

Specifications

General

• Frequency Range: 470~512MHz (K2,M2), 400~430MHz (K3)
• Number of channels: Max. 16
• Channel Spacing: 25kHz (Wide) / 12.5kHz (Narrow)
• PLL Channel Stepping: 5kHz, 6.25kHz
• Operating Voltage: 7.5 V DC±20%
• Battery Life: >18 hours (at 4W, 5-5-90 duty cycle with KNB-45L battery)
• Operating Temperature range: -30°C to +60°C (−22°F to +140°F)
• Frequency Stability: ±2.5ppm (-30°C to +60°C)
• Channel Frequency Spread: 42MHz (K2,M2), 30MHz (K3)
• Dimensions and Weight (Radio Only): 160g (5.6oz), 54(W) x 122(H) x 33.8(D) mm
• Dimensions and Weight (with KNB-45L battery): 280g (9.9oz)

Receiver (Measurements per TIA/EIA-603)

• Sensitivity (EIA 12dB SINAD): 0.25µV (Wide) / 0.28µV (Narrow)
• Selectivity: 70dB (Wide) / 60dB (Narrow)
• Intermodulation: 65dB (Wide) / 60dB (Narrow)
• Spurious response: 60dB
• Audio Power Output: 500mW at 4Ω, <10% distortion

Transmitter (Measurements per TIA/EIA-603)

• RF Power Output: 4W/1W
• Spurious and Harmonics: 65dB
• Modulation: 16K0F3E (Wide) / 11K0F3E (Narrow)
• FM Noise: 45dB (Wide) / 40dB (Narrow)
• Audio Distortion: <5%

Company Information

Contact information for Kenwood Corporation and its global subsidiaries:

• Kenwood Corporation: 2967-3, Ishikawa-machi, Hachioji-shi, Tokyo, 192-8525 Japan
• Kenwood U.S.A. Corporation: P.O. BOX 22745, 2201 East Dominguez Street, Long Beach, CA 90801-5745, U.S.A.
• Kenwood Electronics Canada Inc.: 6070 Kestrel Road, Mississauga, Ontario, Canada L5T 1S8
• Kenwood Electronics Deutschland GmbH: Rembrücker Str. 15, 63150 Heusenstamm, Germany
• Kenwood Electronics Belgium N.V.: Leuvensesteenweg 248 J, 1800 Vilvoorde, Belgium
• Kenwood Electronics France S.A.: L'Etoile Paris Nord 2, 50 Allée des Impressionnistes, Bp 58416 Villepinte, 95944 Roissy Ch De Gaulle Cedex
• Kenwood Electronics UK Limited: KENWOOD House, Dwight Road, Watford, Herts., WD18 9EB United Kingdom
• Kenwood Electronics Europe B.V.: Amsterdamseweg 37, 1422 AC Uithoorn, The Netherlands
• Kenwood Electronics Italia S.p.A.: Via G. Sirtori, 7/9 20129 Milano, Italy
• Kenwood Ibérica, S.A.: Bolivia, 239-08020 Barcelona, Spain
• Kenwood Electronics Australia Pty. Ltd.: 16 Giffnock Avenue, Centrecourt Estate, North Ryde, N.S.W. 2113 Australia
• Kenwood Electronics (Hong Kong) Ltd.: Unit 3712-3724, Level 37, Tower one Metroplaza, 223 Hing Fong Road, Kwai Fong, N.T., Hong Kong
• Kenwood Electronics Singapore Pte Ltd: 1 Ang Mo Kio Street 63, Singapore 569110