Level Diagram - Kenwood NX-1200 Series Service Manual

LEVEL DIAGRAM

TX-RX UNIT (NX-1200 Series)
■
Receiver Section
5
-122.0dBm -121.5dBm -121.0dBm
D101
D102
ANT
D103
C168 D104 C201
4
ANT
LPF
SW
To make measurements in the AF section, connect the AC level meter.
3
(ANT input: -53dBm, 1kHz FM, 1.5kHz DEV (Narrow). SP output: 0.63Vrms@8ohm Load)
In the RF section, use 470pF coupling capacitor.
(The display shows the SSG input value required to obtain 12dB SINAD.)
■
Transmitter Section
AF (1kHz)
2
15mVrms
IC602
IC501
MPU/
MIC
MIC AMP
DSP
1
A B
RF (Center Frequency)
-123.5dBm -119.5dBm
C209 Q200 C216
RF
BPF BPF
AMP
30mVrms -15dBm ~ -5dBm
Q4 Q5 Q6
VCO
VCO
VCO
BUFF
BUFF
C
(No.RA077<Rev.001>) 2-10
-110.0dBm
C224
HPF
IC501
IC200
Transceiver IC MPU/DSP
C88 -15dBm ~ -5dBm
VCO
RF (Center Frequency)
-3.5dBm 5dBm
IC200 C100 Q100 C108 Q104
Transceiver
BUFF PRE-
IC
AMP DRV
D E
2-10 (No.RA077<Rev.001>)
AF (1kHz)
40mVrms 2.02Vp-p
IC302
Internal Speaker
IC603 C633
AF
AF AMP
AMP
2.15Vp-p
FIL
IC300
External Speaker
AF AMP
12dBm 23dBm 38dBm
D101
D102
D103
C122 Q106 C131 Q107 C164 D104
DRV
ANT
FINAL
AMP
SW
* Transmit frequency : 155MHz
F
38dBm 5W
ANT
C168
LPF
G