Kenwood TK-480 - Manual (Page 51)

60
TK-480/481
LEVEL DIAGRAM (TK-481)
VCO IC14
*
C131
PLL
Q10
C136
Q17
C193
Q11
D5
C149
Q12
C152
Power module
D7
C169
L30
ANT
2.5W
–
10.2dBm
(Q10 open)
–
7.4dBm
(Q17 open)
–
0.4dBm
(D5 open)
+5.3dBm (Q12 open)
+17.8dBm (C152 open)
RF (899.00MHz)
EMC
MIC
12
LPF
ALC
COMP
SW
IDC
6
DAC
I5
O5
DAC
I2
O2
13
15
16
18
19
9
8
IC12
16.1mV
rms
16.7mV
rms
41.2mV
rms
353mV
rms
338mV
rms
318mV
rms
IC4
IC3 (1/2)
IC4
*
530mV
rms
133mV
rms
109mV
rms
54mV
rms
AF
5
43
41
DAC
*
IC12
C58
IC3
IC4
AF
AMP IC300
SP
500mW (BTL)
188mV
rms
254mV
rms
376mV
rms
132mV
rms
29mV
rms
AF
C169
L30
ANT
C143
L11
C139
Q9
C122
L20
C110
Q6
R60
XF1
R51
Q5
C55
FM IF
SYSTEM
CF1,2
IC8
AMP
*
–
118.0dBm
–
118.4dBm
–
118.4dBm
–
118.0dBm
–
108.3dBm
–
106.6dBm
–
105.5dBm
–
117.0dBm
–
107.5dBm
(C55 open)
115mV
rms
268mV
rms
–
58dBm
–
55dBm
RF (938.00MHz)
IF1 (44.85MHz)
IF2
(455kHz)
AF
T
o
make measurements in the AF section,
connect the oscilloscope proves directly. (ANT input :
–
47dBm, 1kHz FM, 1.5kHz dev
.)
In the RF section, use a 1000pF coupling capacitor
.
(The display shows the SSG input value required to obtain 12dB SINAD.)
AG is set to the MIC input becomes 1.5kHz Dev at 1kHz MOD. T
o
make measurements in the
AF section, connect the oscilloscope proves directly. In the RF section, use a 1000pF coupling capacitor
.
RX Section TX Section