Table Of Contents - Kenwood TS-890S In-Depth Manual

TABLE OF CONTENTS

01 PROLOGUE
About the Release of the TS-890S . .................................. 1
Features of the TS-890S .................................................. 2
02 RECEPTION CIRCUIT
Receiver Configuration .................................................... 3
First Mixer ........................................................................ 5
Roofing Filters . ................................................................. 5
What is a Roofing Filter? .........................................................5
Roofing Filters .........................................................................6
AGC Circuits .................................................................... 7
Analog AGC Circuits . ...............................................................7
Optimization Of Gain Distribution ............................................8
Deflection of the S Meter Needle . ............................................8
Noise Level . .............................................................................9
RF Gain Adjustment ................................................................9
AGC Off . ..................................................................................9
Noise Blankers . .............................................................. 10
Features of the NB1 and NB2 . ..............................................10
Auxiliary Circuits ............................................................ 11
Medium Wave Band Sensitivity Risers ..................................11
03 TRANSMISSION CIRCUIT
IF Circuit for Clean and Stable 100 W Output Power . ..... 12
FET Final Amplifier Circuit ............................................. 12
High-speed Relay-controlled Antenna Tuner . ................. 13
Linear Amplifier Control ................................................. 14
REMOTE Connector .............................................................14
Linear Amplifier Menu Settings . .............................................15
ALC .......................................................................................17
Transmit Power Limiter ..........................................................18
ALC Operation when an External Device is Connected . ........19
DRV Terminal ................................................................. 20
Protections . .................................................................... 21
SWR Protection . ....................................................................21
Overcurrent Protection ..........................................................21
Thermal Protection and Fan Control ......................................21
04 LOCAL OSCILLATOR CIRCUIT
Local Oscillator .............................................................. 22
First Local Oscillator Signal ...................................................22
05 ANTENNA CONTROL CIRCUIT
Signaling Paths .............................................................. 24
RX Antenna Feature (RX IN / RX OUT Connectors) . .............24
Antenna Output Feature (ANT OUT Connector) . ...................24
TS-890S User Report ............................................................25
06 MPU PERIPHERAL CIRCUIT
MPU Peripherals for Transceiver Control . ....................... 28
MPU Peripherals for Application Control . ....................... 28
MPU Peripherals for Operation Panel Control ................ 28
07 DSP
Features of TS-890S DSP Technologies ........................ 29
DSPs and Peripheral Hardware ..................................... 29
Signal Processing in the IF Stage .................................. 30
IF-AGC ..................................................................................30
AGC Quick Recovery ............................................................31
IF Filter ..................................................................................32
Interference Rejection ...........................................................34
Reception ...................................................................... 36
Demodulation ........................................................................36
AF Filter . ................................................................................37
Audio Peak Filter ...................................................................38
Noise Reduction . ...................................................................39
Beat Canceler . .......................................................................42
Signal Processing by Morse Code Decoder ..........................43
Transmission . ................................................................. 44
Modulation ............................................................................44
Microphone Gain Control ......................................................46
Speech Processors ...............................................................46
Other Functions ............................................................. 48
TX/RX Equalizers ..................................................................48
Voice Guidance .....................................................................48
08 BANDSCOPE
More User-friendly Bandscope ...................................... 49
Differences with the TS-990S as an FFT Bandscope ............49
3 Types of Scope Display Modes . ..........................................49
Reference Level . ....................................................................50
Touchscreen Tuning . ..............................................................50
Gradation Settings . ................................................................51
Tuning Assist Line, Filter Passband Display and Frequency
Marker ...................................................................................51
09 SOFTWARE
Display Function for Actual Operation ............................ 52
Meter .....................................................................................52
Transmission Digital Meter ....................................................53
Filter Scope ...........................................................................53
Operability Improvements for Split Operation . ................ 54
Split Frequency Configuration By Using the Numeric
Keypad . .................................................................................54
Band Direct Key Configuration for Split . .................................54
Split Frequency Change By Using the RIT/XIT Knob . ............54
Split Frequency Reception By Using an External Sub
Receiver . ...............................................................................55