Standard Horizon HX400, Руководство по обслуживанию

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HX400 Service Manual
Alignment
Alignment - 5
Squelch Tight Adjustment (Wide Bandwidth)
1. Press the [
p
] or [
q
] key to
select the display to “ N TI
W ”.
2. Press the [ SQL ] key to enable
adjustment of the Squelch Tight level.
3. Press the [
p
] or [
q
] key to
select a small character of
lower right corner of the dis -
play to “ C ”.
4. Set the RF Signal Generator output level 0
dBμV (with a standard FM modulation: ±3.0
kHz deviation @ 1 kHz) at 156.800 MHz
5. Press the [ H/L ] key to read the Squelch Thresh -
old level,then press and hold the [ H/L ] key for
2 seconds to save the Squelch Tight level at the
band center.
6. Press the [
p
] key to change
the “ C ”character to “ H ” at
the lower right corner of the
display.
7. Change the RF Signal Generator to174.000
MHz. The output level keeps 0 dBμV (with a
standard FM modulation: ±3.0 kHz deviation @
1 kHz).
8. Press the [ H/L ] key to read the Squelch Thresh -
old level,then press and hold the [ H/L ] key for
2 seconds to save the Squelch Tight level at the
high band edge.
9. Press the [
q
] key twice to
change the“ H ” character to
“ L ” at the lower right corner
of the display.
10. Change the RF Signal Generator to134.000
MHz. The output level keeps 0 dBμV (with a
standard FM modulation: ±3.0 kHz deviation @
1 kHz).
11. Press and hold the [ H/L ] key for 2 seconds to
read the Squelch Tight level at the low band
edge.
12. Press the [ CLR(WX) ] key to exit from this align -
ment item.
Squelch Tight Adjustment (Narrow Bandwidth)
1. Press the [
p
] or [
q
] key to
select the display to “ N TI
N ”.
2. Press the [ SQL ] key to enable
adjustment of the Squelch Tight level.
3. Press the [
p
] or [
q
] key to
select asmall character of
lower right corner of the dis -
play to “ C ”.
4. Set the RF Signal Generator output level 0
dBμV (with a standard FM modulation: ±1.5
kHz deviation @ 1 kHz) at 156.800 MHz
5. Press the [ H/L ] key to read the Squelch Thresh -
old level,then press and hold the [ H/L ] key for
2 seconds to save the Squelch Tight level at the
band center.
6. Press the [
p
] key to change
the “ C ”character to “ H ” at
the lower right corner of the
display.
7. Change the RF Signal Generator to174.000
MHz. The output level keeps 0 dBμV (with a
standard FM modulation: ±1.5 kHz deviation @
1 kHz).
8. Press the [ H/L ] key to read the Squelch Thresh -
old level,then press and hold the [ H/L ] key for
2 seconds to save the Squelch Tight level at the
high band edge.
9. Press the [
q
] key twice to
change the“ H ” character to
“ L ” at the lower right corner
of the display.
10. Change the RF Signal Generator to134.000
MHz. The output level keeps 0 dBμV (with a
standard FM modulation: ±1.5 kHz deviation @
1 kHz).
11. Press and hold the [ H/L ] key for 2 seconds to
read the Squelch Tight level at the low band
edge.
12. Press the [ CLR(WX) ] key to exit from this align -
ment item.