Alinco DX-801 Manuel d'instructions télécharger pdf (Page 12)

MFJ-925 Super-Compact IntelliTuner Automatic Antenna Tuner Instruction Manual

Back Panel

RADIO

INTERFACE

POWER

12VDC

750mA

MFJ ENTERPRISES, INC.

STARKVILLE, MS USA

GROUNDTRANSMITTER ANTENNA

Figure 4. MFJ-925 Back Panel.

• Power: This jack accepts a standard 2.1 × 5.5 mm coaxial plug with positive center and negative

sleeve. The tuner requires 12-15 volts DC at up to 750 mA. The use of a regulated supply is not

mandatory but is recommended for best performance. An optional 12 volts DC 1.5 amp power

supply, the MFJ-1316, is available from MFJ Enterprises, Inc. The MFJ-925 also accepts 12 volts

that is impressed on the incoming coax cable using an MFJ-4116 or MFJ-4117 Bias Tee for remote

operation.

WARNING: Do not apply voltages greater than 18 volts to this unit, or permanent damage

may result.

Note: When the tuner power is OFF, the tuner is bypassed and RF from the transmitter goes

directly to the antenna with no matching. When turned on, the tuner powers up in bypass

mode.

• Radio Interface: An 8-pin modular (RJ-45)

connector for connecting to the tuner interface

connector of compatible radios. Most radios

provide +13.8 VDC power thought its tuner

interface connector. If separate power

supplies are used to power the MFJ-925, the

MFJ-925 should be powered on first (both

LEDs blink once) and then turn on the radio,

so the radio knows an external tuner is

attached. The radio will disable its internal

tuner, if it has one, and use the external tuner.

The Radio Interface works with radios that are compatible with Alinco EDX-2, Icom AH-3 and AH-

4, Kenwood AT-300, and Yaesu FC-30, FH-1 and FH-2. When connected to a compatible radio,

simply press the [TUNER] or [AT] button on the radio; for FH-1 or FH-2 compatible Yaesu, press the

[TUNE] button on the tuner to start the automatic tuning process. The radio will automatically switch

to CW mode, transmit a low power (typically 10-30 watts) carrier, and start the tuning process. Once

the automatic tuning is completed, the radio will return to its previous mode and power setting.

WARNING: Make sure the +13.8 volts connection on the radio’s tuner port is capable of

supplying the 750 mA of current required by the MFJ-925.

+13.8 V DC input ( 50 mA)

Ground

Key/TT/TX

TX INH

Start/TS/RX

12345678

Rear Panel View

Figure 5. Radio Interface Connector.

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 39 40

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Alinco DX-801 Manuel d'instructions Page 12

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