Equipment information
Kenwood TL-922A Amplifier
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Model:
TL-922A
Date:
Category:
Group:
Description:
Linear Amplifier
Information
FEATURES
1. The TL-922A is a Class AB2, grounded grid linear
Amplifier developed by Trio-Kenwood through advanced
high-power technology using two high-performance Eimac
3-500Z power tubes. It covers all bands 160 m through 15 m
for SSB, CW and RTTY modes of operation.
2. Unprecedented Reliability
The TL-922A is designed to provide stable, high RF output
power for extended periods of continuous use. Engineered
with Trio-Kenwood's advanced circuit and mechanical
technology, the TL-922A employs two rugged 3-500Z power
tubes to their full advantage.
3. Low Intermodulation Distortion
Intermodulation distortion (IMD) is minimized through the
use of negative R.F. feedback.
4. Quick Turn-On
Warm-up is not necessary. The 3-500Z tubes are fast heating.
5. Full Safety System
To protect you against any possible high voltage electric
shock, your TL-922A has a double safety system comprised of
interlocking switches. One interrupts the high voltage
primary circuit while the second directly grounds the
secondary high voltage circuit. Also provided are bleeder
resistors for discharging the high voltage capacitors and
"DANGER" warnings at high voltage positions. Please observe
all warnings, they are for your protection.
6. Newly-Developed Fan Motor Delay Stop Circuit
To reduce power tube deterioration, your TL-922A has a
newly-developed fan motor delay-stop circuit comprised of a
thermal delay relay. The cooling fan will normally run for
140 seconds (Typ) after power is removed from the unit and
will measurably extended tube life.
7. Mode Switch for Efficient Linear Operation
MODE switching is provided to select between the SSB Mode
for the maximum PEP output with good
linearity, and the CW Mode for low power consumption and
heat generation during extended periods of operation.
8. Linear Amplification Control Switch
This switch is capable of setting your TL-922A in the
straight-through state irrespective of the standby control
on the exciter.
9. Variable Threshold Level (ALC Detector)
The ALC circuit will accommodate exciters of 80 w to 120 w
(nominal) by varying the ALC threshold level. This
effectively prevents overdriving the final power tubes,
limiting the Amplifier to its linear range and guaranteeing
low distortion at maximum power.
10. Two Panel Meters
In adjusting or monitoring your TL-922A, one meter always
indicates the (Ip) plate current; while, with the other, you
may read (Ig) grid current, (RF) relative output, or (HV)
high voltage. This facilitates ease of operation of your
TL-922A.
11. Rigid Mechanical Structure
The die-cast side panels effectively support the weight of
the Amplifier against shocks and jarring during
transportation. Recessed side panel handles are provided so
the Amplifier can be easily carried.
12. Vernier Plate Tuning Dial
The PLATE tune dial is equipped with a reduction gear that
facilitates easy tuning, particularly for the higher bands.
It also effectively prevents accidental miss-tuning during
operation. Controls and panel arrangement, designed to human
engineering standards, provide superior ease of operation.
13. Neat, Contemporary Appearance
Mechanical arrangement and sophisticated design to match any
Trio-Kenwood Transceiver or Transmitter. Your TL-922A can
also be used as a high-quality, general purpose Amateur band
linear Amplifier with any exciter capable of 80W to 120W RF
output.
Manual Type:
Service and User Manual
Pages:
22
Size:
10.78 Mbytes (11305635 Bytes)
Language:
english
Revision:
Manual-ID:
Date:
Quality:
Scanned document, all readable.
Upload date:
2018 07 14
MD5:
a45ba349ae4797eaa5a9d33b2932ad9a
Downloads:
1349
Information
Instruction Manual
CONTENTS
TL-922A SPECIFICATIONS ... 3
SECTION 1 FEATURES ... 4
SECTION 2 PREPARATION FOR USE ... 5
2.1 Accessories
2.2 Installation of Power Tubes
2.3 General Tips on Installation
2.4 AC Power Source
2.5 Line Voltage Change
2.6 Power Cable
2.7 Exciter
2.8 Antenna
2.9 Interconnection
2.9.1 Grounding
2.9.2 Cable Connection
SECTION 3 CONTROLS AND THEIR FUNCTIONS . 9
3.1 Front Panel
3.2 Rear Panel
SECTION 4 OPERATION ... 11
4.1 Prechecks
4.2 CW Operation
4.3 SSB Operation
4.4 RTTY Operation
4.5 Setting the ALC ADJ Control
4.6 Adjusting the RF Output Meter
4.7 High-Voltage Transformer Protection
4.8 Carrying Your TL-922A
SECTION 5 CIRCUIT DESCRIPTION ... 13
5.1 Linear Power Amplifier
5.2 Power Supply
5.3 Fan Motor Delay Stop Circuit
5.4 Meter Drive Circuit
5.5 Spark Suppressor
SECTION 6 MAINTENANCE ... 15
6.1 Internal Cleaning
6.2 Replacing Power Fuses
6.3 Replacing Power Tubes
6.4 Input Matching Circuit
SECTION 7 TROUBLESHOOTING HINTS ... 16
PACKING ... 17
INTERNAL PART LOCATIONS ... 18
SCHEMATIC DIAGRAM ... 19
ILLUSTRATIONS
Fig. 2-1 Upper Case Cover Assembly/
Disassembly ... 5
Fig. 2-2 Correct Power Tube Handling ... 5
Fig. 2-3 Parasitic Suppressor Coil Mounting ... 6
Fig. 2-4 Input Voltage Terminal Boards ... 7
Fig. 2-5 Power Cable Color Code ... 8
Fig. 2-6 Exciter Connections for RL and ALC
Controls ... 8
Fig. 2-7 Interconnection of the TL-922A ... 8
Fig. 3-1 Front View ... 9
Fig. 3-2 Rear View
... 10
Fig. 5-1 Linear Power Amplifier Circuit ... 13
Fig. 5-2 Transformer Primary Current Flow ... 14
Fig. 5-3 Fan Motpr Delay Stop Circuit ... 14
Fig. 5-4 Meter Drive Circuit ... 14
Fig. 7-1 Packing for Shipment ... 17
Fig. 7-2,3 Top, Bottom Views ... 18
TABLES
1. Front Panel Controls Set-Up ... 11
2. Tune and Load Initial Settings ... 11