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TC-265/365 SERVICE MANUAL
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55
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Adjustment Description
This radio has different kinds of adjustment parameter. The adjustment parameters are divided into
different items according to wideband/narrowband and center, low and high frequency. You can adjust
the radio by programming software or through manual adjust mode.
1. Instruments:
1. Communication analyzer 1 set
2. Frequency scanner 1 set
3. 3A/10V DC power source 1 set
4. Digital multi meter 1 set
5. 3A Ammeter 1 set
2. Adjustment:
1.Initialization:
It is necessary to initialize the radio because there is useless data in EEPROM. Short out the two
SELF points, the radio enters all reset mode. Use channel selector knob to select radio destination.
Press [PTT] and [MONI] simultaneously, the radio data are all initialized.
Please refer to “5.1 All Reset Mode” in “Radio Modes” for more details.
2. Adjustment:
TC-265/365 can be adjusted by manual adjust mode or through PC programming software. The
following table describes the adjustment details of manual adjust mode.
3. Manual Adjust Mode
Measurement
Adjustment
Item Condition
Test
equipment
Condition Terminal Parts Method
Specifications
/Remarks
1.Frequency
stability
Communication
analyzer
ANT
VR1
Frequency
stability
≤
5PPM
2. Receive VCO
adjustment.
Release PTT.
Digital
Multi-meter
CV
TC2
high frequency:
3.8V±0.1V
Check Low
frequency CV:
≥
0.7V
3. Transmit
VCO
adjustment.
Press PTT.
Digital
multi-meter
CV
TC1
high frequency:
3.8V±0.1V
Communication
analyzer
FILTER:
0.3-3.4KHz
MIC AF:
1KHz
12mv±3mv
ANT VR501
3.0KHz (wideband)
1.5KHz(narrowband)
1.PLL
frequency
stability
and VCO
lock
voltage
4. Transmit tone
deviation
adjustment and
check.
LPF: 15KHz
1KHz
120mv
≤
4.3KHz (wideband)
≤
2.2KHz (narrowband)
Adjust at low
frequency.