Level Diagram - Kenwood NX-840H Service Manual

LEVEL DIAGRAM

Receiver Section
RF (Center Frequency)
5
N: -120 dBm
N: - 119.5dBm
ANT
LNA
BPF
Q506
D
G1
4
To make measurements in the RF section, connect the RF level meter.
In the RF section, use a 0.01uF coupling capacitor.
(The display shows the SSG input value required to obtain 12dB SINAD.) e
Transmitter Section
AF (1KHz)
3
12.1mVrms
4.21mVrms
50.1mVrms
MIC
Baseband IC
IC 706
MIC amplifier
IC709
2 20
1 21
To make measurements in the AF section, connect the AC level meter.
AG is set so that MIC input becomes 1.5kHz (Narrow) DEV at AF :1kHz .
2
1
A B
IF_1 (49.95MHz)
N: -116.5dBm
N: - 103dBm N: -101.5dBm
IF amplifier
Mixer MCF
BPF
Q501
XF500
Q503
G1 D
TX VCO
49.8mVrms
5.4dBm
-12dBm
Baseband IC
Q7
Q11
IC709
20 24
C
(No.RA011<Rev.001>) 2-8
IF_2 (450kHz)
82mVrms
N: -100dBm
FMIC
IC500
IC501
9
16
To make measurement in the AF section, connect the AC level meter.
(ANT input: -53dBm, AF 1kHz FM,Dev 1.5kHz
The AF output level is adjusted near 4.0Vrms / 4ohm by adjust VOL key.
RF (CENTER FREQUENCY)
TX-RX unit
3dBm
6.2dBm
23dBm
DRIVE FET
Q12
Q300
C301
C108 D16
C101
To make measurements in the RF section, connect the RF Wattmeter (50ohm).
In the RF section, use a 1000pF coupling capacitor.
D E
2-8 (No.RA011<Rev.001>)
AF Frequency (1kHz)
242mVrms
84mVrms
83mVrms
0.100Vrms
281mVrms
Baseband IC Baseband IC
IC715
IC709
IC709
16 17 16
13
26 15
Power Module TX-RX unit
17dBm
FINAL FET
ANT
IC300
1 4
D305
C313
D306
F
4 Vrms
4.59 Vrms
J701
IC719
10 1
H : 45W
M : 25W
L : 5W
50
G