Transmitter Section - Kenwood TM-D710A Service Manual

Transmitter Section

250mVrms : K,M4
100mVrms : E
5mVrms : K,M4
2mVrms : E 67mVrms 320mVrms
2 1
MIC
AMP
12
11
IC802 IC804
MIC
1/2 E VR
1200bps
1Vp-p : 1200bps
2Vp-p : 9600bps
PKD
TX-RX unit
2
IC20
E VR
Display unit
Note 1: Set the AG so that the microphone socket input is 3kHz deviation at 1kHz modulation.
The data communication connector input level is 3kHz deviation at 1kHz modulation for 1200bps
and 2kHz deviation at 1kHz modulation for 9600bps.
Note 2: Set the transmit power to HI (K,E types) / MID (M4 type).
Note 3: The measurements with the power meter, except for the ANT connector, are the values
with the APC off.
Note 4: When measuring the data level as 1200 or 9600 bps, perform the following settings in
menu mode:
• BEACON TYPE: APRS (Menu mode: 600)
• DATA SPEED: 1200 bps or 9600 bps (Menu mode: 601)
LEVEL DIAGRAM
AF (1kHz)
320mVrms 950mVrms 950mVrms 950mVrms
6 7 9 19 2
ALC
AMP
IC806
IC802
cross
2/2
point
SW
10
PKD
AMP
13 14
IC805
1/4 320mVrms
9600bps
+5.5dBm : VHF
0dBm : UHF
+6.0dBm +14.0dBm
Q7 Q644
+4.5dBm +14.5dBm
Q161
2Vp-p : 1200bps 5Vp-p : 1200bps
5
1
1
IC19
SW
2Vp-p : 9600bps 5Vp-p : 9600bps
TM-D710A/D710E
1 6
PRE
MOD
AMP
AMP
IC803 SPL Filter 2
1/2
IC803
2/2
Center Frequency
+16.5dBm
IC131
VHF
POWER AMP
Q131
+16.5dBm
IC161
UHF
POWER AMP
Q162
29
IC12
TNC
35
ASIC
670mVrms : VHF
550mVrms : UHF
330mVrms : VHF
220mVrms : UHF
VCO A
7 9 10 4 3 4
IC804 IC804
E VR E VR
Vc
TCXO
50W : K,E
23W : M4
LPF
LPF HPF
X1
(A)
ANT
83