HYT POWER446, Service Manual, Page: 36 / 61

POWER446 Service Manual
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Tuning Description
I Required Test Instruments:
Radio communication test set (HP8921) 1 set
10V/3A regulated DC power supply 1 set
Digital voltmeter 1 set
Ammeter 1 set
II Preparation
Place the board to be tested on the test fixture (please ensure good connection between each test point
and the fixture), and connect the board to a power supply.
III Tuning Procedures
Description of Tuning Procedures
1) PCB Tuning
Before the PCB arrives at each work station for specification inspection, programs must be
downloaded and EEPROM must be initialized by the profiles (downloading with a test framework/
initializing via programming software or through wired clone). If any adjustment is required,
connect the programming cable to the radio and enter the tuning mode for PC adjustment.
2) Radio Tuning
Rotate the
Channel Selector
knob to CH1, and hold down
PTT
and
SK2
for 1.5 seconds while
powering on the radio. The LED will glow orange when the radio enters the Tuning Mode. After the
keys are released, the radio will enter the default tuning item in TX group (preset power), and the
LED will glow red. Then follow the instructions to tune each item.
Or connect the programming cable to the radio for real-time tuning in PC Programming Mode.
2. Description of Tuning Items:
Wide Band Narrow Band
Channel
Tunable
Frequency
Freq.1 Freq.2 Freq.3 Freq.4 Freq.5 Freq.1 Freq.2 Freq.3 Freq.4 Freq.5
TX Item
1
TX Preset Power Y
2
TX Low Power Y Y Y Y Y
3
TX
Medium
Power
(Reserved)
4
TX High Power Y Y Y Y Y