EasyManua.ls Logo

Kenwood TL-922A User Manual

Kenwood TL-922A
22 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
Page #1 background imageLoading...
Page #1 background image
QKENWOOD
LINEAR
AMPLIFIER
Model
TL-922A
INSTRUCTION
MANUAL
Question and Answer IconNeed help?

Do you have a question about the Kenwood TL-922A and is the answer not in the manual?

Kenwood TL-922A Specifications

General IconGeneral
BrandKenwood
ModelTL-922A
CategoryAmplifier
LanguageEnglish

Summary

Section 1: Features

Class AB2 Grounded Grid Amplifier

Describes amplifier class and tube type for optimal performance.

Unprecedented Reliability

Highlights stable, high RF output for continuous use and advanced engineering.

Low Intermodulation Distortion

Mentions minimized IMD via negative RF feedback for cleaner signals.

Quick Turn-On

Notes no warm-up needed due to fast-heating tubes, improving usability.

Full Safety System

Explains the double safety system for high voltage protection and user safety.

Fan Motor Delay Stop Circuit

Describes circuit to reduce power tube deterioration and extend tube life.

Mode Switch for Efficient Operation

Explains SSB/CW mode selection for optimal PEP output and heat management.

Linear Amplification Control Switch

Allows setting the amplifier in a straight-through state for flexibility.

Variable Threshold ALC Detector

Adjusts ALC threshold to prevent overdriving tubes and ensure linearity.

Two Panel Meters

Describes meters for monitoring plate current, grid current, RF output, or HV.

Rigid Mechanical Structure

Highlights die-cast panels and recessed handles for durability and portability.

Vernier Plate Tuning Dial

Features a reduction gear for easy tuning and preventing miss-tuning.

Neat, Contemporary Appearance

Mentions sophisticated design to aesthetically match Trio-Kenwood equipment.

Section 2: Preparation for Use

2.1 Accessories

Lists supplied accessories with quantities for initial setup.

2.2 Installation of Power Tubes

Details procedures for installing the two Eimac 3-500Z power tubes safely.

2.3 General Tips on Installation

Provides advice on placement, ventilation, and stability for optimal operation.

2.4 AC Power Source

Advises on using a power line with sufficient current capacity for performance.

2.5 Line Voltage Change

Explains how to change input voltage from 120V to 240V as required.

2.6 Power Cable

Instructs on connecting the power cable plug to the wall outlet.

2.7 Exciter Requirements

Details suitable exciters and output power requirements for driving the amplifier.

2.8 Antenna Requirements

Specifies requirements for the antenna impedance and power rating for optimal performance.

2.9.1 Grounding

Emphasizes connecting GND posts for shock and RFI prevention.

2.9.2 Cable Connection

Guides on interconnecting with supplied cables for proper operation.

Section 3: Controls and Functions

3.1 Front Panel Controls

Details functions of front panel controls like IP Meter, ON AIR Indicator, and BAND Selector.

3.2 Rear Panel Controls

Describes rear panel connectors and controls like Cooling Fan, RF Input, and GND Post.

Section 4: Operation

4.1 Prechecks

Lists essential checks before powering on the amplifier for safe operation.

4.2 CW Operation

Provides step-by-step instructions for CW mode tuning and operation.

4.3 SSB Operation

Guides on tune-up procedures for SSB mode to ensure linearity and performance.

4.4 RTTY Operation

Refers to CW tune-up procedures for RTTY operation, noting key-down limits.

4.5 Setting the ALC ADJ Control

Explains how to adjust ALC control to prevent overdrive and distortion.

4.6 Adjusting the RF Output Meter

Details how to calibrate the RF output meter reading for accuracy.

4.7 High Voltage Transformer Protection

Describes the thermal protection circuit for the HV transformer and its behavior.

4.8 Carrying Your TL-922A

Provides guidance on safe handling and transport of the unit, including weight.

Section 5: Circuit Description

5.1 Linear Power Amplifier Circuit

Describes the amplifier circuit, input matching, and tube operation principles.

5.2 Power Supply Circuit

Explains the voltage doubling rectifier, transformers, and capacitor bank.

5.3 Fan Motor Delay Stop Circuit

Details the circuit that keeps the fan running after power-off for tube cooling.

5.4 Meter Drive Circuit

Explains how plate current, grid current, RF output, and HV are measured.

5.5 Spark Suppressor

Describes the discharge gap device for preventing high voltage spikes at antenna relay terminals.

Section 6: Maintenance

6.1 Internal Cleaning

Advises on regular vacuuming of internal components to prevent arcing and overheating.

6.2 Replacing Power Fuses

Guides on locating and replacing blown fuses with correct ratings.

6.3 Replacing Power Tubes

Refers to Section 2.2 for detailed power tube replacement procedures.

6.4 Input Matching Circuit Adjustment

States the circuit is factory preset and requires professional adjustment for RF/DC voltages.

Section 7: Troubleshooting Hints

No Power Output

Lists common causes and remedies for the unit not producing any output power.

Output Power Too Low

Identifies reasons for low output and their solutions, including IP and HV readings.

RF Meter Swing Too High or Low

Explains causes for incorrect RF meter readings and how to adjust them.

Fuse Blows on Power On

Addresses issues causing fuses to blow, such as incorrect installation or line voltage problems.

Overheating Transformer

Discusses causes for overheating and how to secure covers properly.

Related product manuals