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