Pcb Section; Transmitter Section - JETStream JT220M Service Manual

PCB Section

Item Condition
1. Setting 1) Power supply voltage
DC Power supply terminal : 13.8V
1) CH: TX high
2. VCO lock
2) CH: RX high
voltage
3) CH: TX low
4) CH: RX low

Transmitter section

Item Condition
1. Frequency 1) CH: TX center
2) Transmit
2. Maximum 1) CH : TX high
power 2) Adjustment HEX value : FF
alignment 3) Transmit
3. High 1) CH : TX low
power CH : TX low'
CH : TX center
CH : TX high'
CH : TX high
2) Transmit
4. Mid 1) CH : TX low
power CH : TX low'
CH : TX center
CH : TX high'
CH : TX high
2) Transmit
5. Low 1) CH : TX low
power CH : TX low'
CH : TX center
CH : TX high'
CH : TX high
2) Transmit
6. DCS 1) CH : TX center
balance 2) Transmit
7.Max 1) CH : TX low (Wide)
deviation CH : TX center (Wide/Narrow)
CH : TX high (Wide)
2) AG : 1kHz/120mV
3) Transmit
ADJUSTMENT
Measurement
Test equipment Terminal
Digital voltmeter TC2
Measurement
Test equipment Terminal
Frequency counter
ANT
Power meter
Modulation analyzer
or Linear detector
(LPF : 3kHz)
Oscilloscope
Modulation ANT
analyzer or linear MIC
detector
(LPF15kHz)
Oscilloscope
AG
AF. V. M
1
Adjustment
Parts Method
CV201 3.3 V
CV200 3.3 V
Check
Adjustment
Parts Method
Encoder Adjust to the frequency
knob
VR200 55W
50W
Encoder
knob
10W
5W
Adjust the waveform as
below
±4.3kHz (Wide)
±2.1kHz (Narrow)
According to the large +,
–
JT220M
Specifications
/Remarks
±0.5V
±0.5V
More than 0.6V
Specifications
/Remarks
Within ±200Hz
±5.0W
±2W
±1W
±200Hz
±100Hz