Transmitter Section - Standard Horizon HX751 Service Manual

Noise Squelch Hysteresis Adjustment
 Press the [  ] or [  ] key to select
HS n xx HS n xx HS n xx".
the display to "HS n xx HS n xx
 Press the [ CLR/WX ] key to enable
adjustment of the Noise Squelch
Hysteresis level.
 Press the [  ] or [  ] key to set the display to "HS n 00
 Press the [ CLR/WX ] key again to save the new set-
ting.
Noise Squelch Threshold Adjustment
 Adjust the RF Signal Generator output level –12 dBμV
(with a standard FM modulation: ±3.0 kHz deviation
@ 1 kHz) at 156.800 MHz.
 Press the [  ] or [  ] key to select
the display to "tH n xx tH n xx tH n xx". tH n xx tH n xx
 Press the [ CLR/WX ] key to read the
Noise Squelch Threshold data.
 Press the [ CLR/WX ] key again to save the new set-
ting.
Noise Squelch Tight Adjustment
 Adjust the RF Signal Generator output level –2 dBμV
(with a standard FM modulation: ±3.0 kHz deviation
@ 1 kHz) at 156.800 MHz.
 Press the [  ] or [  ] key to select
ti n xx ti n xx
the display to "ti n xx ti n xx". ti n xx
 Press the [ CLR/WX ] key to read the
Noise Squelch Tight data.
 Press the [ CLR/WX ] key again to save the new set-
ting.
 Press and hold the [ POWER ( )] key for 2 seconds to
turn the transceiver off.

Transmitter Section

TX Power Adjustment (Normal Power)
 Connect the wattmeter and dummy load to the an-
tenna jack.
 Set the transceiver to CH16 (156.800 MHz) with "Nor-
mal" power mode, then turn the transceiver off.
Press and hold in the PTT, [ SQL ] , [  ] , and [  ] keys
while turn the transceiver on to enter the alignment
mode.
 Press the [  ] or [  ] key to select
U Po xx". U Po xx U Po xx
the display to "U Po xx U Po xx
 Press the [ CLR/WX ] key to enable
adjustment of this Alignment
Mode.
 Press the PTT key to transmit the transceiver, if nec-
essary, press the [  ] or [  ] key to adjust the output
power to 6.0 W (±0.3 W).
 Press the [ CLR/WX ] key to save the new setting.
 Press and hold the [ POWER ( )] key for 2 seconds to
turn the transceiver off.
TX Power Adjustment (Hi Power)
 Connect the wattmeter and dummy load to the an-
tenna jack.
 Set the transceiver to CH16 (156.800 MHz) with "High"
power mode, then turn the transceiver off.
 Press and hold in the PTT, [ SQL ] , [  ] , and [  ] keys
HS n 00". HS n 00 HS n 00
HS n 00
while turn the transceiver on to enter the alignment
mode.
 Press the [  ] or [  ] key to select
the display to "H Po xx
 Press the [ CLR/WX ] key to enable
adjustment of this Alignment
Mode.
 Press the PTT key to transmit the transceiver, if nec-
essary, press the [  ] or [  ] key to adjust the output
power to 5.0 W (±0.1 W).
 Press the [ CLR/WX ] key to save the new setting.
 Press and hold the [ POWER ( )] key for 2 seconds to
turn the transceiver off.
TX Power Adjustment (Medium Power)
 Connect the wattmeter and dummy load to the an-
tenna jack.
 Set the transceiver to CH16 (156.800 MHz) with "Me-
dium" power mode, then turn the transceiver off.
Press and hold in the PTT, [ SQL ] , [  ] , and [  ] keys
while turn the transceiver on to enter the alignment
mode.
 Press the [  ] or [  ] key to select
the display to "n Po xx
 Press the [ CLR/WX ] key to enable
adjustment of this Alignment
Mode.
 Press the PTT key to transmit the transceiver, if nec-
essary, press the [  ] or [  ] key to adjust the output
power to 2.5 W (±0.1 W).
 Press the [ CLR/WX ] key to save the new setting.
 Press and hold the [ POWER ( )] key for 2 seconds to
turn the transceiver off.
Alignment
H Po xx". H Po xx H Po xx H Po xx
n Po xx". n Po xx n Po xx n Po xx
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