Kenwood TH-D74E Service Manual page 69

Transmitter Section
5
7.6mVrms
C893
(J880)
MIC
4
AF(1kHz)
3
-11.0dBm: VHF
-10.0dBm: UHF
B
VCO
TCXO
2
X362
RF
Note1: This is the value measured while removed from the chassis. Use a short transmission burst. In the worst case scenario, some parts will be damaged. During this test,
some parts will reach high temperature.
Note2: For the 1kHz MOD to become 8mVrms, set the MIC input terminal to AG.
Note3: Set the transmission output to Low.
1
Note4: Connect a 50Ohm terminal load or power meter to the ANT terminal.
Note5: RF levels for each point, other than for the ANT terminal, are measured at 1000pF with a spectrum analyzer through a capacitor.
Note6: Measure the AF level and Data level values with an oscilloscope.
A B
AF(1kHz)
109.6mVrms: VHF
36.1mVrms: UHF
13.7mVrms
IC707
IC881
C923
C6
2 1 C2
MIC
CODEC
AMP
-7.4dBm: VHF
+4.5dBm: VHF
-7.6dBm: UHF
+5.2dBm: UHF
C397
C142
ATT
3
Q361
C
(No.RA044<Rev.001>) 2-19
622.0mVrms: VHF 165.0mVrms: VHF
204.0mVrms: UHF 133.0mVrms: UHF
IC720
IC671
C848
6 7 18 19
E VR
MOD
AMP
1
2
279.0mVrms: VHF
90.0mVrms: UHF
RF(Center Frequency)
-0.8dBm: VHF
+7.3dBm: UHF
C126 C128
6
Q6
IC1
C113
D E
2-19 (No.RA044<Rev.001>)
CONT
LPF HPF LPF
Q2
LPF LPF
HPF
F
0.5W
ANT
G