Standard Horizon HX280E, Руководство по обслуживанию

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10
Before Alignment
ˆ
Install the HX280 Service Flag Controller Program to
your computer.
ˆ
Remove the Front Panel from the transceiver accord-
ing to the following procedures:
1) Disconnect the antenna from the transceiver.
2) Remove the VOL knob and Battery Pack from the
transceiver
3) Remove the two screws which located at the bot-
tom side on the battery compartment.
4) Carefully pull out the chassis from the Front Panel.
Refer to the “Exploded View“ on the page 4.
ˆ
Set up the test equipment as shown below, and set the
DC Power Supply voltage to 7.4 V.
ˆ
Execute the HX280 Service Flag Controller Program.
ˆ
Select the COM port number which is connected to
the HX280 Alignment Jig.
ˆ
Press and hold in the [
PRESET
] key
while turning the transceiver on to
enter the Alignment Mode.
ˆ
Select “Alignment ON” Radio But-
ton of the HX280 Service Flag Con-
troller Program.
ˆ
Click the left mouse button on the
[
SET
] button of the HX280 Service
Flag Controller Program.
Main Reference Frequency Adjustment
ˆ
Turn the Antenna switch to the “TX Alignment” side.
ˆ
Remove the solder jumper
JP1001
.
ˆ
Set the channel to CH16.
ˆ
Use the [
H/L
] key to set the transceiver to “LOW”
power.
ˆ
With the
PTT
switch pressed, adjust
TC1001
so the
Frequency Counter reading is 156.800 MHz ± 100 Hz.
Transmit Power Adjustment
ˆ
Turn the Antenna switch to the “TX Alignment” side.
ˆ
Set the channel to CH16.
ˆ
Increase the DC Power Supply voltage to 8.0 V.
ˆ
Use the [
H/L
] key to set the transceiver to “HI” power.
ˆ
With the
PTT
switch pressed, adjust
VR1003
so that
RF output power is 5.0 W ± 0.1 W.
ˆ
Release the
PTT
switch, then set the transceiver to
“LOW” power by the [
H/L
] key.
ˆ
With the
PTT
switch pressed, adjust
VR1002
so that
RF output power is 0.8 W ± 0.1 W.
ˆ
Release the
PTT
switch.
ˆ
Return the DC Power Supply voltage to 7.4 V.
Alignment
HX280 Alignment Jig
D-SUB 9-pin Jack
RF Sampling
Coupler
Inline
Wattmeter
50
Dummy Load
Ω
Frequency
Counter
( ) :
( ) :
RED
BLACK
( ) :
( ) :
RED
BLACK
AF Signal
Generator
VR1005
TP1018
VR1001
TC1001
JP1001
VR1003
VR1002
16 1 W
Resistor
Ω
RF Signal
Generator
Regulated
Power Supply
Antenna Switch
“RX” Alignment “TX” Alignment
Attention!
The HX280’s Audio output is BTL output.