Level Diagram - Kenwood TK-D240 Service Manual

LEVEL DIAGRAM

Receiver Section
5 RF (Center Frequency)
N: –120dBm (K,M)
N: –118dBm (E,E2)
N: –117dBm
ANT BPF LNA
G1
Q405
4
To make measurements in the RF section, connect the RF level meter.
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
8mVrms
MIC
Baseband
IC
C763
2
IC705
MIC input : 1.5kHz DEV.(Narrow) at 1kHz MOD
Transmitting frequency : Center frequency
1
A B
IF1 (49.95MHz)
N: –117dBm
N: –106.5dBm
N: –107dBm
BPF MCF
D G1 D
Mixer XF400
Q404
134mVrms
23 VCO Buffer Buffer
~ ~
24
Q6 Q9
Q11
31mVrm
C
(No.RA035<Rev.001>) 2-5
IF2 (450kHz)
74.8mVrms
N: –102dBm
IF AMP FM IC
1 13
Q403 IC400
RF (Center Frequency)
5.3dBm 16.3dBm
Buffer Pre-Drive
Q10 C201 Q201
C216
D E
2-5 (No.RA035<Rev.001>)
AF (1kHz)
76.8mVrms 12.7mVrms
438mVrms
76.5mVrms
Baseband Baseband
IC IC
16
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.
24.0dBm 38.0dBm
Drive Final
Q206 Q208
C228 C268
F
0.63Vrms
0.76Vrms
IC707 J601
4 10
5W
LPF
G