JETStream JT220M, Руководство по обслуживанию

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JT220M
2
ADJUSTMENT
Transmitter section
Item Condition
Measurement Adjustment
Specifications
/Remarks Test equipment Terminal Parts Method
8. MIC
sensitivity
1) CH : TX center (Narrow)
2) AG : 1kHz/4mV
3) Transmit
Modulation
analyzer or linear
detector
(LPF15kHz)
Oscilloscope
AG
AF. V. M
ANT
MIC
Check
±
1.7~2.0kHz
(Narrow)
9. CTCSS
fine
deviation
1) CH : TX low (Wide)
CH : TX center (Wide/Narrow)
CH : TX high (Wide)
2) Transmit
Modulation analyzer
or Linear detector
(LPF : 3kHz)
Oscilloscope
Encoder
Knob
±
0.7kHz (Wide)
±
0.4kHz (Narrow)
±200Hz
±100Hz
10. DCS fine
deviation
1) CH : TX low (Wide)
CH : TX center (Wide/Narrow)
CH : TX high (Wide)
2) Transmit
±
0.8kHz (Wide)
±
0.4kHz (Narrow)
±200Hz
±100Hz
11. DTMF
deviation
1) CH : TX center (Wide/Narrow)
2) Transmit
±
3.0 kHz (Wide)
±
1.5kHz (Narrow)
±100Hz
Receiver Section
Item Condition
Measurement Adjustment Specifications
/Remarks Test equipment Terminal Parts Method
1. Sensitivity 1) CH : RX low (Wide/Narrow)
CH : RX center (Wide/Narrow)
CH : RX high (Wide/Narrow)
2) SSG output:
: –119dBm (0.25
μ
V ) (Wide)
: –116dBm (0.35
μ
V ) (Narrow)
Mod : 1kHz
Dev :
±
3.0kHz (Wide)
Dev :
±
1.5kHz (Narrow)
SSG
Oscilloscope
AF V.M
Distortion meter
ANT
EXT. SP
Check SINAD:
12dB or higher
2. Squelch 20 1) CH : TX low (Wide)
CH : TX center (Wide/Narrow)
CH : TX high (Wide)
2) SSG output:
: –116dBm (0.35
μ
V ) (Wide)
: –114dBm (0.44
μ
V ) (Narrow)
Mod : 1kHz
Dev :
±
3.0kHz (Wide)
Dev :
±
1.5kHz (Narrow)
Encoder
knob
Adjust to open the
squelch
3. Squelch 1 1) CH : TX low (Wide)
CH : TX center (Wide/Narrow)
CH : TX high (Wide)
2) SSG output:
: –127dBm (0.1
μ
V ) (Wide)
: –123dBm (0.16
μ
V ) (Narrow)
Mod : 1kHz
Dev :
±
3.0kHz (Wide)
Dev :
±
1.5kHz (Narrow)