Level Diagram; Receiver Section - Kenwood TM-D710A Service Manual

TM-D710A/D710E

Receiver Section

–123dBm
D134,135
D186,188
ANT
ANT
SW
D164,165
D187,189
ANT
SW
13
1Vp-p
PRI
3
Display unit
82

LEVEL DIAGRAM

Center Frequency
–121dBm –109.5dBm
BPF
Q228 Q227
A Band VHF Receiver circuit
–121dBm –109.5dBm
BPF
Q293 Q292
B Band VHF Receiver circuit
–121dBm –109.5dBm
BPF
Q363 Q362
A Band UHF Receiver circuit
–121dBm –109.5dBm
BPF
Q408 Q407
B Band UHF Receiver circuit
155mVrms 460mVrms 390mVrms
Q810 Q806
IC666
14
Multi
SW
Q811 Q807
155mVrms 460mVrms 390mVrms
1Vp-p 0.4Vp-p
1200bps
IC22 IC20
BUFF E VR 14
4 13
9600bps
45.05MHz
–105dBm
XF486
BPF MCF
Q226
1st Local
49.95MHz
–105dBm
XF546
BPF MCF
Q291
1st Local
–107.5dBm
Note1: The 12dB SINAD levels were
BPF
Q361
1st Local
Note2: The AF levels were measured
–107.5dBm
BPF
Q406
1st Local
AF (1kHz)
390mVrms
5 IC806 13 13 13
IC804
cross
E VR
point
6 14 16
SW
20
Q955
390mVrms
1Vp-p 0.8Vp-p
Q12
2
1 2
IC10
BUFF
6 7
5
Q13
1.4Vp-p 1.2Vp-p
455kHz AF (1kHz)
–110dBm 155mVrms
A Band
IC486
16 9
FM IC
AF
CF
Wide
CF
Narrow
450kHz AF (1kHz)
–109dBm 155mVrms
B Band
IC546
16 9
FM IC
AF
CF
Wide
CF
Narrow
plotted using a standard signal-
generator through a 0.01μF
ceramic capacitor at each point
from the RF to the first IF.
with an AF voltmeter when the
–73dBm (50μV) standard signal
generator signal modulated by a
1kHz modulation frequency and a
3kHz deviation was received and
the AF output was adjusted to
0.63V/8Ω by the AF VR.
0.63Vrms
J801 (SP1)
9 3
8Ω
IC801
AF AMP
PR (PNL)
TX-RX unit
1
16
IC12
TNC
IC17
ASIC
7 14