Kenwood TS-990S Service Manual

TS-990S
8
CIRCUIT DESCRIPTION
a 62.4MHz.
The harmonic components are cut by the BPF from the
62.4MHz, amplifi ed by Q57, and output as an SLO2.
The diode switch (D52) cuts the output of SLO2 if IFB is
selected.
CN42
40M
R40M
Q1
Buffer
IC1
PLL
15.6M
X1,Q13
Buffer
Q19
Buffer
Q25
Q34
Q50,52
Q57
Q4
AMP
IC10
PLL
393.6M
Q16
AMP
Q11
AMP
Q23
IC14
DDS
IC15
AMP
Doubler
D16
D19
D25
AMP
Q49
CF1
Buffer
Q29
AMP
Q28
D11
Phase MOD
Buffer
Q20
FM MOD
AMP
Q3
IC11
DDS
CN66
FMOD
AMP
Q2
Doubler
Buffer
Q5
IC12
DDS
Doubler
D52
CN65
SLO2
AMP
Q61
CN63
SLO1
D22
D23
D32
D33
D34
D44
D45
D46
D56
D36
D26
D27
D53
D54
D55
IC16
PLL
73.125~
87.755MHz
87.755~
103.505MHz
103.505~
120.94MHz
120.94~
133.095MHz
Q17, Q18, Q39, Q40
AMP
Q51
AMP
Q60
AMP
Q56
CN59
TLO1
CN64
SLO3
Buffer
Fig. 4 Reference signal generator of the transmitter and receiver block, TLO1/SLO1/SLO2/SLO3
■
SLO3 (3rd Local Oscillator for Sub Receiver)
The DDS (IC12) generates an SLO3 which is used for
the modulator and detector.
The DDS outputs the signal via the BPF as an SLO3.

Kenwood TS-990S Specifications

General

Receiver Type	Triple Conversion Superheterodyne
Antenna Tuner	Built-in automatic antenna tuner
DSP	Yes
IF DSP	Yes
Modes	SSB, CW, AM, FM
Display	7-inch TFT color LCD
Weight	25 kg (55.1 lbs)
Antenna Connectors	SO-239
Power Supply	13.8V DC