Icom IC-910H service manual RF Peak, TX Power

SOFTWARE ADJUSTMENT (continued)

ADJUSTMENT		ADJUSTMENT CONDITION		DISPLAY	OPERATION
ADJUSTMENT	1	• Enter software adjustment mode (Refer			Push [RIT] key to strat transmitting.
				USB
ITEM (6)		page 5-12).
RF PEAK		• Push [6] key to enter the RF peak adjust-
		ment for TX.
		• Connect an RF power meter to [VHF ANT]
		connector.
	2			USB	• Pushing [SET] key, tune the [MAIN
		• Connect an SSG to P501 on the PA unit
		via the JIG cable (A) and set as:			DIAL] to maximum.
					• Adjust L501, L502 on the PA unit
		Frequency : 10.850 MHz
					(illustration for location page 5-9) to
		Level	: 18 mV* (–22 dBm)
					maximum.
		Modulation : OFF
					• Pushing [SET] key, tune the [MAIN
		NOTE: While transmitting, adjust SSG’s			DIAL] to maximum, then push [RIT]
		level and keep the output power less than			key to store peak setting into mem-
		30 W.			ory and to step next.
	3			USB	(1) Pushing [ATT] key, tune the
					[MAIN DIAL] to maximum.
					(2) Pushing [SET] key, tune the
					[MAIN DIAL] to maximum.
					(3) Repeat (1) and (2) several times
					until output power will be peak,
					then push [RIT] key to store peak
					setting into memory and to step
					next.
	4			USB	Same as step 3. Then turn power
					OFF and ON to return the normal
					operation mode. Then continue to
					adjust from step 4 of the RF PEAK
					adjustment (page 5-8).
ADJUSTMENT	1	• Enter software adjustment mode (Refer			Push [RIT] key to strat transmitting.
				CW
ITEM (7)		page 5-12).
TX POWER/		• Push [7] key to enter the TX power/meter
METER		adjustment.
(for 144 M)		• Connect an RF power meter to [VHF ANT]
		connector.
	2			CW	Tune the [MAIN DIAL] to 100 W
					(High power). Push [RIT] key to
					store the adjustment value into
					memory, and to step next.
	3			CW	Tune the [MAIN DIAL] to 50 W
					(Middle power). Push [RIT] key to
					store the adjustment value into
					memory, and to step next.
	4			CW	Verify the output power (Low power)
					is 1–5 W, then push [RIT] key to step
					next.
(for 1200 M)	5	• Connect a	digital multimeter or oscillo-		Push [RIT] key to strat transmitting.
				CW
		scope to check point CP1631.

6	CW	Tune the [MAIN DIAL] to 3.0 V at the
		check point CP1681. Push [RIT] key
		to store the adjustment value into
		memory, and to step next.

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

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