Standard Horizon HX280E, Service Manual

Page: 11 / 42

11
Alignment
TX Deviation Adjustment
ˆ
Turn the Antenna switch to the “TX Alignment” side.
ˆ
Confirm that the solder jumper
JP1001
is removed.
ˆ
Set the AF Signal Generator output to 200 mVrms at 1
kHz.
ˆ
Set the channel to CH16.
ˆ
With the
PTT
switch pressed, adjust
VR1001
so that
the maximum deviation is 4.4 kHz ± 0.1 kHz.
ˆ
Release the
PTT
switch.
ˆ
Solder the jumper
JP1001
.
Squelch Level Adjustment
ˆ
Turn the Antenna switch to the “RX Alignment” side.
ˆ
Set the channel to CH16.
ˆ
Set the RF Signal Generator output to 156.800 MHz,
at a level of +0 dB
μ (HX280S) or +3 dB μ (HX280E),
±3.0 kHz deviation with a 1 kHz audio tone.
ˆ
Connect the DC voltmeter to
TP1018
, adjust
VR1005
so that DC voltmeter reading is 0.2 V ± 0.02 V (HX280S)
or 0.45 V ± 0.02 V (HX280E).
Software Alignment/Confirmation Mode
Overview of Software Alignment Mode
ˆ
The “Software Alignment Mode” has been build in
the microprocessor in order to adjust and confirm the
performance of transceiver.
ˆ
The purpose is to adjust transceiver simply and to con-
firm the performance of transceiver smoothly.
Starting Software Alignment Mode
ˆ
Set the channel to CH16, then turn the
VOL
knob
counter clockwise to turn off the radio.
ˆ
Turn the Antenna switch to the “RX Alignment” side.
ˆ
Turn the
VOL
knob clockwise to
turn on the radio while press and
holding the [
PRESET
] keys. The
LCD will be shown the Alignment
mode “
AL AL AL AL AL
”.
ˆ
Press the [
SCAN
] key. Then the LCD
will be shown the Alignment Item
(1st Item is Threshold “
tH tH
tH tH tH
”).
ˆ
Set the RF Signal Generator output
to 156.800 MHz, at a level of –8 dB
μ (HX280S) or
–6 dB μ (HX280E), ±3.0 kHz deviation with a 1 kHz
audio tone.
ˆ
Press the [
PRESET
] key to record a
threshold level.
ˆ
Press the [
MEM
] key to save the new
setting.
ˆ
Press the [
SCAN ] key to recall the
Alignment Item “
tI tI
tI tI
tI
(TIGHT)”.
ˆ
Set the RF Signal Generator output
to 156.800 MHz, at a level of +0 dB
μ
(HX280S) or +3 dB μ (HX280E), ±3.0 kHz deviation
with a 1 kHz audio tone.
ˆ
Press the [
PRESET ] key to record a
tight level.
ˆ
Press the [
MEM
] key to save the new
setting.
This completes the Software Alignment Mode. To save
all settings and exit, press and hold the [
16/9
] key for one
second. Then turn off the transceiver.
After Alignment
ˆ
Execute the HX280 Service Flag Controller Program
again.
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 OFF” Radio But-
ton of HX280 Service Flag Control-
ler Program.
ˆ
Click the left mouse button on the
[
SET
] button of the HX280 Service
Flag Controller Program.
ˆ
Turn off the transceiver.
ˆ
Assemble the transceiver while being carefully so that
Rubber Packing does not protrude from a Front Case.
Important Note: To ensure the radio is water proof,
make sure the gasket is installed on the chassis cor-
rectly and is not pinched when inserted into the front
case.
NOTICE
Do not touch the Alignment Item “
dC dC dC dC dC
”.