85
LEVEL DIAGRAM
TH-D72A/D72E
VCO
B
TCXO
(B)
–7.8dBm: VHF
–9.8dBm: UHF
–10.3dBm: VHF
–8.5dBm: UHF
+4.3dBm: VHF
+7.8dBm: UHF
+9.5dBm: VHF
+9.3dBm: UHF
0.5W
175mVrms
55mVrms
200mVrms
200mVrms
115mVrms
59mVrms 58mVrms
10mVrms
840mVrms
Center Frequency
AF (1kHz)
3.3Vp-p
2.7Vp-p
352
ulti
W
IC720
Multi
SW
IC733
Buff
IC732
IC728
TNC
ASIC
1
IC721
E VR
14
17
15
16
170mVrms
Q717
Q715
Q711
Q718
Q703
De-emp AMP
CN701
VOL
2
6
IC734
AF AMP
0.63Vrms
(SP)
8
Ω
9
6
IC722
IC722
IC202
8
7
TONE A
TONE B
IC737
Main
MCU
128
126
7
6
1
0.5Vp-p: 1200bps
0.3Vp-p: 9600bps
13
14 1200pbs
9600pbs
2
6
1
7
1
7
3.2Vp-p
3.3Vp-p
2.4Vp-p
Q728
Q729
2
5
16
14
X511
C594
C223
C574
C248
C260
Q201
Q214
R264
ATT
4
1
Q215
ANT
LPF
LPF
HPF
CONT
RF
CN715
LPF
HPF
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.
Note4: Connect a 50
Ω
terminal load or power meter to the ANT terminal.
Note5: When measuring data levels of 1200/9600bps, transmit the BEACON at 1200bps and 9600bps.
Refer to the instruction manual for the settings.
Note6: The RF levels for each point, other than for the ANT terminal, are measured at 1000pF with a spectrum analyzer
through a capacitor.
Note7: Measure the AF level and Data level values with an oscilloscope.
000pF with a spectrum analyzer through a capacitor.
enerator by a no modulation from ANT connecter.
n oscilloscope when the –60dBm standard signal generator signal modulated by a 1kHz modulation frequency and
AF output was adjusted to 0.63V/8
Ω
by the AF VR.
scilloscope at each point, where the data level inputs a –60dBm SSG signal to the VHF zone frequency using the following settings.