Level Diagram - Kenwood NX-340 Service Manual

LEVEL DIAGRAM

Receiver Section
RF (Center Frequency)
5
N : –120.5dBm N : –119.5dBm
ANT BPF LNA
G1
Q405
To make measurements in the RF section, connect the RF level meter.
4 In the RF section, use a 0.01µF coupling capacitor.
(The display shows the SSG input value required to obtain 12dB SINAD.)
Transmitter Section
AF (1KHz)
3
18.14mVrms 86.2mVrms
MIC
Baseband
20
IC
CML
21 24
C775
IC705
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 1kHz MOD.
2
1
A B
IF1 (49.95MHz)
N : –116dBm
N : –107dBm N : –104dBm
BPF MCF
D G1 D
Mixer XF400
Q404
TX VCO
72.6mVrms
–2.16dBm
Q9 Q10
C74
C
(No.RA003<Rev.004>) 2-5
IF2 (450kHz)
N : –102dBm
IF AMP FM IC
1
Q403 IC400
f1: K, M
f2: K2, P, M2, M3
f3: K3
f1,f2: 13.15dBm
f3: 12.34dBm
f1,f2: 14.17dBm
1.31dBm
f3: 13.26dBm
PRE DRIVE
DRIVE FET
AMP
C81 C216 C219
Q201 Q206
To make measurements in the RF section, connect the RF Wattmeter (50ohm).
In the RF section, use a 270pF coupling capacitor.
D E
2-5 (No.RA003<Rev.004>)
AF (1kHz)
82mVrms 91.91mVrms 15.28mVrms
90.98mVrms 460mVrms
Baseband Baseband
IC
IC
16
13 17 16 26
CML CML
IC705 IC705
To make measurement in the AF section, connect the AC level meter.
(ANT input: –53dBm, 1kHz FM, 1.5kHz Dev (Narrow).)
The AF output level is adjusted for a 0.6Vrms/8ohm by the Volume knob.
RF (Center Frequency)
High
High
f1,f2: 18.61dBm
f1,f2: 33dBm
f3: 22.53dBm
f3: 34.3dBm
Low
Low
f1,f2: 14.52dBm
f1,f2: 26dBm
f3: 22.50dBm
f3: 27.6dBm
FINAL FET
C228 C268 D203
Q208
D204
F
0.63Vrms
0.88Vrms
IC707 J601
4 10
H:5W
L:1W
ANT
G