– 11 –
– RX Adjustment and Check –
1. RX VCO Voltage Check
Setting:
Procedure:
1. Connect a digital voltmeter to TP (RX VCO) and TP (GND).
2. Press
[1]
key to change the test mode step to VCO/TX FREQ.
ADJ.
3. Check that the value of digital voltmeter is 1.3 ±0.1 V.
2. DISCRI Coil Adjustment
Setting:
Procedure:
1. Connect a SSG to TP (ANT) and TP (GND) .
2. Connect a noise meter to TP (DISC) and TP (GND) .
3. Press the
[4]
key to change the test mode step to RX ADJ.
4. Adjust L502 so that the value of noise meter becomes
maximum.
3. Speaker Output Level Adjustment
Setting:
Procedure:
1. Disconnect the speaker (SP801) , and connect a noise meter to
J502.
2. Adjust RT501 so that the value of noise meter becomes 80 ±5
mV.
4. Sensitivity Adjustment
Setting:
Procedure:
1. Change the carrier frequency of SSG to 46.97 MHz.
2. Change the output level of SSG to 20 dBµ EMF.
3. Connect a SINAD meter and level meter to J502.
4. Press the
[CHANNEL]
key three times to change the channel to
10CH.
5. Adjust L510 to get maximum reading on the SINAD meter.
6. Check that the value of level meter is more than 12 dB.
7. Change the output level of SSG to 4 dBµ EMF.
8. Adjust L510 to get maximum reading on the SINAD meter.
9. Check that the value of level meter is more than 12 dB.
10. Adjust L501 to get maximum reading on the SINAD meter.
11. Check that the value of level meter is more than 12 dB.
12. Change the frequency of SSG to 43.72 MHz.
13. Press the
[CHANNEL]
key three times to change the channel to
11CH.
14. Adjust L501 to get maximum reading on the SINAD meter.
15. Check that the value of level meter is more than 12 dB.
16. Change the frequency of SSG to 44.48 MHz.
17. Press the
[CHANNEL]
key three times to change the channel to
25CH.
18. Check that the value of level meter is more than 12 dB.
19. Change the frequency of SSG to 46.77 MHz.
20. Press the
[4]
key to change the channel to 6CH.
21. Check that the value of level meter is more than 12 dB.
22. Change the frequency of SSG to 44.16 MHz.
23. Press the
[CHANNEL]
key to change the channel to 18CH.
24. Check that the value of level meter is more than 12 dB.
+
–
digital voltmeter
TP (RX VCO)
TP (GND)
SSG
Carrier frequency: 46.77 MHz
Modulation: 1 kHz,
±
3 kHz deviation
Output level: 66 dB
µ
EMF
TP (ANT)
TP (GND)
+
–
noise meter
TP (DISC)
TP (GND)
SSG
Carrier frequency: 46.77 MHz
Modulation: 1 kHz,
±
3 kHz deviation
Output level: 66 dB
µ
EMF
TP (ANT)
TP (GND)
noise meter
150
Ω
+
–
J502 pin
1
J502 pin
2
SSG
Carrier frequency: 46.97 MHz
Modulation: 1 kHz,
±
3 kHz deviation
Output level: 20 dB
µ
EMF
TP (ANT)
TP (GND)
level meter
150
Ω
+
–
+
–
SINAD meter
J502 pin
1
J502 pin
2
