Level Diagram - Kenwood UBZ-LJ8 Service Manual

UBZ-LJ8
Transmitter Section
J200
EXT.
MIC
INT.
AF
MIC
5.17mV
Q6
C28
RF
–1.8dBm
Receiver Section
RF
–117dBm
ANT
LPF
IC2
16
IF IC
5
CF1
IF1
–95.5dBm
IF2
–64.5dBm
32

LEVEL DIAGRAM

CONTROL
IC204 IC209
MIC AMP
MIC
3 3
4 & 7
AMP
CTCSS
Q14 Q7
C52
RF
–1.3dBm
RF RF
–117.5dBm –118.5dBm
L31
C102 C144
RF CONTROL
IC209
R264
23 CTCSS
9
3
AF
50mV
RF
VR1
C265
VCO
AF AF AF
167mV 167mV 87mV
Q8
C58
RF RF
11.8dBm 28.1dBm
Microphone input : 1kHz, 5.0mVrms, 1.5kHz DEV
AF : Measurements are taken by AF VTVM
RF : Measurements are taken by RF VTVM
RF
–104.5dBm
Q9
Q10
C94
C90
VR201
R256 C251
20
AF AF
350mV 224mV
Each of the levels plotted from the RF to IF is the level which can provide
20dB SINAD for an SSG through 4700pF ceramic capacitor.
The AF level is the value measured by an AF VTVM when an SSG signal of
–53dBm is received and the AF output is adjusted to 0.63V using AF VOL.
Q4
C15 C26
RF RF
–8.0dBm –12.8dBm
LPF
D8
C70
RF RF
28.3dBm 27.0dBm
IF1
–101dBm
MCF
R71 R69
IC203
AFO
2 AF AMP 5
SP
J200
ANT
Q11
C116
INT. SP
EXT. SP
8Ω
50mW
(0.63Vrms)