Squelch Tight Adjustment (Wide Bandwidth); Squelch Tight Adjustment (Narrow Bandwidth) - Standard Horizon HX400 Service Manual

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.
Alignment - 5
Alignment
HX400 Service Manual