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WCS-880
Adjustment Location:
MIC jack
– TX BASE BOARD –
(J1)
(Component Side)
1 t 2 t 3
SW51
[RF CHANNEL]
CT2
RV1 RV2
TX OSC (12.8MHz)
Adjustment
TX Modulation
Sensitivity Adjustment
–VCO BOARD –
CT1
VCO Voltage
Adjustment
shield case
lead wire antenna (ANT1)
– TX BASE BOARD –
(Conductor Side)
TP58
CP54
8
RV3
RV51
TX Output Level
Adjustment
Q50
TP53
IC51
Foot of VCO board
shield case
RX SECTION
1. Consumption Current Check
Setting:
regulated dc
power supply
+
mA
–
battery
terminal #
Procedure:
1. Connect a regulated dc power supply (1.5 V) and ampere meter.
2. Set the [RF CHANNEL] switch (SW1) to [1].
3. Check that the value of ampere meter satisfy specified value.
Specified value: 50 mA to 65 mA
2. RX Frequency Adjustment
Setting:
digital voltmeter
lead wire
antenna (ANT1)
FM RF SSG
1/4 λ sleeve
Carrier frequency: 863.4 MHz
Modulation: 1 kHz, ± 20 kHz deviation
Output level: – 60 dBm
Procedure:
Connect the 1/4 λ sleeve antenna to a SSG, and put the an-
1.
tenna by the lead wire antenna (ANT2).
2.
Connect a digital voltmeter to the TP51 on RX BASE board
and the foot of FE board shield case.
3.
Connect REC out plug (P1) to an oscilloscope.
Set the [RF CHANNEL] switch (SW1) to [1].
4.
5.
Adjust CT1 on the RX BASE board so that the value of digi-
tal voltmeter becomes 1.4 V.
6.
Confirm that the waveform of oscilloscope is sine wave.
7.
Change the carrier frequency of SSG to 864.2 MHz.
Change the [RF CHANNEL] switch (SW1) to [2].
8.
9.
Adjust CT2 on the RX BASE board so that the value of digi-
tal voltmeter becomes 1.4 V.
10. Confirm that the waveform of oscilloscope is sine wave.
11. Change the carrier frequency of SSG to 864.6 MHz.
12. Change the [RF CHANNEL] switch (SW1) to [3].
13. Adjust CT3 on the RX BASE board so that the value of digi-
tal voltmeter becomes 1.4 V.
14. Confirm that the waveform of oscilloscope is sine wave.
Adjustment Location: RX BASE Board (See page 9)
battery
terminal 3
Set
+
–
Foot of VCO
to TP51
board shield
case
RX BASE
board
antenna
oscilloscope
(DC range)
REC out plug (P1)
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