Manual Icom iPW1 (page 17 of 20) (English)

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OPERATION

This linear ampliﬁer has various protection circuits.

D ALC circuit

The ALC (Automatic Level Control) circuit automati-

cally limits RF output power by controlling the input

level of the exciter. This prevents transmission of dis-

torted signals when the input signal level exceeds the

allowable level.

The ALC activates under the following conditions:

- Output power of the linear ampliﬁer exceeds 1 kW

- Antenna SWR becomes 2:1 or more

- Output power of the exciter exceeds 100 W

D Cooling fans

•The power supply cooling fans activate when the lin-

ear ampliﬁer is activated and while transmitting.

•The antenna tuner cooling fans activate when the

antenna tuner is activated and while transmitting.

•All cooling fans activate when the heatsink tempera-

ture of the final FETs reaches 50 °C (122 °F) or

more.

D Circuit breaker

If the circuit breaker activates or the linear ampliﬁer

stops functioning, try to ﬁnd the source of the prob-

lem, then push the circuit breaker button to fill the

white parts.

- Circuit breaker capacity: 20 A (U.S.A. version)

15 A (Europe version)

D Linear ampliﬁer protection circuit

When a protection circuit is activated, a band indicator

blinks to show a problem as described below.

➥ [AMP/PROTECT] lights red when a protection cir-

cuit is activated.

- Push [AMP/PROTECT] to cancel the protection circuit.

The built-in automatic antenna tuner can match the

antenna feed line impedance to 50 Ω when the feed

line impedance is within 16.7 to 150 Ω for HF bands

(VSWR 3:1) or within 20 to 125 Ω for 50 MHz bands

(VSWR 2.5:1).

Once the tuner matches an antenna, the tuning cir-

cuit condition is memorized as a preset point for each

frequency range (100 kHz steps, 70 ranges). There-

fore, when you change the frequency range, the tun-

ing circuit is automatically preset to the memorized

point.

This antenna tuner is also used when the linear am-

pliﬁer is turned OFF.

➥ Push [TUNER] for 2 sec. to start manual antenna

tuning.

•When the tuner cannot tune the antenna (SWR 1.5:1 or

greater), the tuning circuit is bypassed automatically

after 20 sec.

While operating in the 50 MHz band, the antenna

tuner does not start automatically. Push [TUNER]

for 2 sec. to tune the antenna manually.

■ Protection circuit

■ Antenna tuner operation

Item Indication Possible cause

1 [TEMP]

The heatsink temperature of the

ﬁnal FETs exceeds 100 °C (212

°F).

2 [AUTO]

Power level of the 4 PA units be-

comes unbalanced.

3 [ALC]

ALC control level exceeds the

control range.

4 [VD]

Output voltage of the internal

power supply exceeds 55 V DC.

5 [ID]

Current of the ﬁnal FETs (I

) ex-

ceeds 50 A.

Current band’s

indicator

Gain of the ﬁnal FETs drops.

Selected and

current band’s

indicator

When transmitting with different

band selections between the lin-

ear ampliﬁer and exciter.

[AMP/PROTECT]

The power supply has a malfunc-

tion.

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Icom iPW1 Manual

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