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Receiver Section
–120.0dBm
–122.5dBm –124.5dBm
ANT
L108
L302
C127
C304
IF2 (455kHz)
–45.0dBm –27.0dBm
IC303
CF302
MIX
IF AMP
C362
R344
Measurement conditions
• In the RF and IF1 sections, use a 1000pF coupling capacitor. (The RF input level shows the SSG input level for obtaining 12dB SINAD.)
• In the IF2 section, use a 0.1µF coupling capacitor. (The RF input level from the SSG shows the SSG input level for obtaining 12dB SINAD
sensitivity.)
• In the AF section, make measurements with an AC level meter. (The SSG RF output level is –53dBm, 1kHz FM MOD. 3kHz DEV.)
Transmitter Section
17.4mVrms
16.3mVrms
MIC
(MAIN)
C19
IC3
NC AMP
–13dBm
VCO
C241
L702
PLL
Measurement conditions
• Connect the audio generator (AG) to the microphone terminal. The AG output has such a level that FM modulation is 3kHz at 1kHz.
• In the AF section, make measurements with an AC level meter.
• In the RF section, open the circuit after the measurement point and make measurements through a 100pF capacitor with a spectrum
analyzer.
LEVEL DIAGRAM
RF (860.55MHz)
–107.0dBm –109.0dBm
L307
C309
C318
Q302
455
ADC
DSP
CODEC
IC609
IC611
IC608
IC302
AF
14.7mVrms
47mVrms
96.5mVrms
TP18
CODEC
C605
R604
C624
IC608
IC602
RF (824.90MHz)
–3.5dBm
2.6dBm
C243
C253
D101
Q206
Q205
RX Lo
–114.0dBm
IC301
C330
C334
R352
AF
27mVrms
100mVrms
100mVrms
AF
DAC
R641
C642
IC605
IC606
96mVrms
370mVrms
MOD
SW
C631
C665
IC706
IC606
IC604
7.4dBm
18dBm
Q1
C1
C109
C113
Q101
Q103
TK-5400
IF1 (44.85MHz)
–117.0dBm
–96.0dBm
XF301
R353
C337
C340
Q304
810mVrms
27mVrms
AF
AMP
IC1
IC607
238mVrms
VCO
DAC
R624
IC605
25.9dBm
3.0W=34.8dBm
35.7dBm
Q2
L108
C12
C35
D103
C127
Q3
PA
500mW
(BLT)
SP
ANT
61
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