15
TS-2000/X
■
Main receiver IF section
The signal input to IC4 is mixed with the signal produced
by amplifying the first local oscillator RXLO1 from the PLL
section by Q30 and lower hetero to the first IF of
41.895MHz. Then, it passes through the MCF (XF1) and
AGC amplifier (Q38) and goes to the second mixer (Q42 and
43). The signal input to the second mixer is mixed with the
signal produced by amplifying the second local oscillator
21.2MHz from the PLL section by Q44 and lower hetero to
the second IF of 19.695MHz. The signal then passes
through a temperature compensating resistor and the IF
amplifier (Q61) and is sent to the TX-RX1 unit (X57-605).
■
Sub receiver IF section
The signal input to IC5 is lower hetero to the first IF of
58.525MHz. In the VHF band, the local oscillator SLO1 from
the PLL section is divided into two by the divider (IC6) and
passes through amplifier (Q23). In the UHF band, the IF sig-
nal passes through amplifier (Q33) and is input to IC5. The
IF signal passes through the MCF (XF2), passes through the
post amplifier (AGC amplifier in the AM mode) Q37 and
goes to the FM IC (IC7). The local oscillator is supplied to
IC7 by the 58.07MHz crystal oscillator (X1) and is lower
hetero to the second IF of 455kHz by a mixer in the IC.
The circuit operation when the signal passes through a
ceramic filter after lower hetero is different for K destination
and E destination. The circuit operation for each of the des-
tinations is explained below.
CF2 (E type only)
CF1
455kHz
DSP
IC6
IC9
X53-391
FM
58.07
MHz
Q51 Q48 Q45
Q39
D58
AM
FM IC
IC7
Q37
XF2
58.525MHz
IC5
AGC
D53
D56
Q32
Q33
TX-RX 2 (X57-606 A/11)
IC6
1/2
VHF
UHF
SLO1
322.95~
465.04MHz
176.5~
231.5MHz
348.5~
458.5MHz
SQ
Q63
D83
S-meter
Q44
LO31
31.2MHz
Q42,43
Q38
Q30
Q61
XF1
41.895MHz
IC4
LO1RX
RIF
X57-605
VHF
UHF
TX-RX 2 (X57-6060 A/11)
D46
D49
HF 1.2GHz
Q22
10.695
MHz
• K destination
In FM mode, the signal passes through a ceramic filter
(CF1), is quadrature-detected, and the resulting signal is out-
put.
• E, E2 destinations
The signal passes through a ceramic filter (CF1) in FM
WIDE mode and it passes through a ceramic filter (CF2) in
FM NARROW mode. The signal is then quadrature-de-
tected and the resulting signal is output.
In AM mode, a 455kHz signal passes through the AGC
amplifier (Q51) and amplifier (Q48 and Q45) and is detected
by D58. The detection signal retrieved for the AGC is recti-
fied, passes through the DC amplifier (Q39) for AGC control
and goes to the Q37 gate terminal (G2).
The FM/AM detection signal is switched by the multi-
plexer (IC8). Then, it is amplified by the operational amplifier
(IC9) and output to the control unit (X53-391).
■
Squelch voltage and S-meter voltage of the sub
receiver section
The S meter voltage is introduced to the A/D through a
LPF for RSSI output of the FM IC (IC7).
The squelch voltage is supplied to the A/D by passing the
detection output of the FM IC through a filter amplifier in the
FM IC, amplifying it with the noise amplifier (Q63), and recti-
fying it with D83.
Fig. 7
Fig. 8
CIRCUIT DESCRIPTION
Содержание TS-2000
Страница 132: ...TS 2000 X TS 2000 X 134 WIRING ...
Страница 142: ...1 2 B A D F C E G I H J 3 5 7 9 4 6 8 10 12 14 11 13 TS 2000 X CIRCUIT DIAGRAM 165 ...
Страница 144: ...1 2 B A D F C E G I H J 3 5 7 9 4 6 8 10 12 14 11 13 TS 2000 X CIRCUIT DIAGRAM 169 ...
Страница 167: ...234 TS 2000 X MC 52DM MULTI FUNCTION MICROPHONE WITH DTMF Schamatic Diagram ...