Level Diagram - Kenwood NX-720 Service Manual

Receiver Section
RF (Center Frequency)
–119.5dBm
–120.0dBm
C262
186.2mVrms
SUM
ASIC
C746
IC507
IC711
To make measurements in the AF section,connect the AC level meter. (ANT input:–53dBm, 1kHz FM, 3kHz DEV (Wide))
In the RF section, use a 1000pF coupling capacitor.
(The display shows the SSG input value required to obtain 12dB SINAD without local level.)
Transmitter Section
5.2mVrms
(at MIC terminal)
75.0mVrms
C774
IC703
2.6dBm
VCO
C89
RXLO
MIC input : 3kHz DEV.(Wide), 1.5kHz DEV.(Narrow) at 1kHz MOD.
Transmitting frequency : Center frequency

LEVEL DIAGRAM

–114.5dBm
LNA
C254 C216
Q202
AF (1kHz)
186.2mVrms 226.1mVrms
DAC
C704
IC711 IC712
IC502
58.0mVrms
DSP
ASIC
C706
IC507
RF (Center Frequency)
2.6dBm
Drive
T/R SW
D17
C104
Q102
D16
IF1 (49.95MHz)
–121.0dBm
IF Amp
MCF
Mixer
C361
Q201
XF1
Q305
101.2mVrms 21.46mVrms
Audio Amp
C806
IC714
AF (1kHz)
251.0mVrms(W)
125.4mVrms(N)
246.1mVrms(W)
123.5mVrms(N)
C51
IC701
15dBm
Final IC
ANT- SW
D110
C136
IC102
NX-720(G)/720
IF2 (450kHz)
–107.0dBm -62.0dBm
FM IC CF
C347 C343
IC303 CF2
3.6Vrms 3.24W
94.9mVrms(W)
47.5mVrms(N)
VCO
25W
CPL
LPF
FWD/REV
RX in
Detector
ASIC
IC507
81