Kenwood NX-3720HG Service Manual page 179

LEVEL DIAGRAM
NX-3720/3720H
Receiver Section
5
RF (Center Frequency)
-120dBm -121dBm -121.5dBm
ANT D205
D206
4 C262 D207 C337
ANT
LPF
SW
To make measurements in the AF section, connect the AC level meter.
(ANT input: –53dBm, 1kHz FM, 3kHz DEV (Wide). SP output: 4W@4ohm Load)
3
In the RF section, use 1000pF coupling capacitor.
(The display shows the SSG input value required to obtain 12dB SINAD.)
Transmitter Section
AF (1kHz)
2
6.0mVrms
IC607
MIC
CODEC
1
A B
-107.5dBm
-122.5dBm
C311
HPF
C306 IC302
HPF Transceiver IC
C145
-5dBm~+5dBm
VCO
AF (1kHz)
123.3mVrms
-5~5dBm
(Mod) (Local)
IC404
C327 C145
VCO
IC303
MPU/
DSP
Transceiver IC
C D
(No.RA054<Rev.001>) 2-11
141mVrms
IC607
IC404
C655 IC412 C661 IC608 C627 IC601
MPU/DSP
VOL
CODEC
RF (Center Frequency)
3dBm 14.5dBm K:18.2dBm
E:15.2dBm
C216 IC202 C225 Q201 C238 IC201
Pre-
Drive
Drive
* Transmit frequency : 155MHz
E
2-11 (No.RA054<Rev.001>)
AF (1kHz)
72.1mVrms 77.4mVrms
K:50W
K:48dBm K:47.8dBm
E:25W
E:45dBm E:44.8dBm
D205 ANT
D206
C250 D207 C262
ANT
Final
LPF
SW
F G