Icom IC-F21S service manual Sensitivity, Squelch, Level, Sql

SOFTWARE ADJUSTMENT – continued

Select an operation using [↑ ] / [↓ ] keys, then set specified value using [←					] / [→ ] keys on the connected computer keyboard.
ADJUSTMENT		ADJUSTMENT CONDITION			MEASUREMENT	VALUE
				UNIT	LOCATION
RX	1	• Operating frequency:		Top	Connect a SINAD meter with an	Minimum distortion
SENSITIVITY			440.000 MHz	panel	8 Ω load to the [SP] jack.	level
[BPF T1]–[BPF T4]		• Channel spacing	:Narrow
		• Connect a standard signal generator to
		the antenna connector and set as:
		Frequency	: 440.000 MHz
		Level	: 10 µV* (–87 dBm)
		Modulation	: OFF
		Deviation	: ±1.75 kHz
		• Receiving
		CONVENIENT: The BPF T1–BPF T4 can be adjusted automatically.
		q-1: Set the cursol to “BPF ALL” on the adjustment program and then push [ENTER]
			key.
		q-2: The connected PC tunes BPF T1–BPF T4 to peak levels.
			or
		w-1: Set the cursol to one of BPF T1, T2, T3, or T4 as desired.
		w-2: Push [ENTER] key to start tuning.
		w-3: Repeat w-1 and w-2 to perform additional BPF tuning.
SQUELCH		• Operating frequency:		Top	Connect a SINAD meter with an	12 dB SINAD
LEVEL			455.000 MHz	panel	8Ω load to the [SP] jack.
[SQL]		• Channel spacing	: Narrow
	1	• Connect a standard signal generator to
		the antenna connector and set as:
		Frequency	: 455.000 MHz
		Level	: 0.2 µV* (–121 dBm)
		Modulation	: 1 kHz
		Deviation	: ±1.75 kHz
		• Receiving
	2	• Receiving				At the point where
						the audio signals
						just appears.

*The output level of the standard signal generator (SSG) is indicated as the SSG’s open circuit.

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