Squelch Threshold Adjustment; Squelch Tight Adjustment - Standard Horizon HX851 Service Manual

08: Squelch Threshold Adjustment

Set the RF signal generator output to channel fre-
quency, at a level of –8 dBµ with ±3.0 kHz deviation
with a 1 kHz audio tone.
Click the left mouse button on the [ 08: Threshold ]
button. The transceiver now is in the Squelch
Threshold Alignment Mode.
Press the [ Get ] key to read the Squelch Threshold
data.
Click the left mouse button on the [ 08: Threshold ]
button to exit the the Squelch Threshold Alignment
Mode.

09: Squelch Tight Adjustment

Set the RF signal generator output to channel fre-
quency, at a level of 0 dBµ with ±3.0 kHz deviation
with a 1 kHz audio tone.
Click the left mouse button on the [ 09: Tight ] but-
ton. The transceiver now is in the Squelch Tight
Alignment Mode.
Press the [ Get ] key to read the Squelch Tight data.
Click the left mouse button on the [ 08: Tight ] button
to exit the the Squelch Tight Alignment Mode.
10: CH70 Squelch Threshold Adjustment
Set the RF signal generator output to 156.525 MHz,
at a level of –5 dBµ with ±3.0 kHz deviation with a 1
kHz audio tone.
Click the left mouse button on the [ 10: CH70 SQL ]
button. The transceiver now is in the CH70 Squelch
Threshold Alignment Mode.
Press the [ Get ] key to read the Squelch Tight data.
Click the left mouse button on the [ 10: CH70 SQL ]
button to exit the the CH70 Squelch Threshold Align-
ment Mode.
11: DC Voltmeter
Reduce the DC power supply voltage to 7.4 V.
Click the left mouse button on the [ 11: DC Voltage ]
button. The transceiver now is in the DC Voltmeter
Alignment Mode.
Press the [ Get ] key to read the Squelch Tight data.
Click the left mouse button on the [ 10: CH70 SQL ]
button to exit the the DC Voltmeter Alignment Mode.
Alignment
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