MFJ -941EK Bedienungsanleitung PDF herunterladen

MFJ-941E Versa Tuner II

MFJ VERSA TUNER II

GENERAL INFORMATION:

The MFJ-941E is designed to match virtually any transmitter to any antenna, including dipoles,

inverted-vees, verticals, mobile whips, beams, random wires, and others fed by coax lines,

balanced lines or a single wire. An eight-position antenna-selector switch provides versatile

antenna selection. The MFJ-941E will handle up to 300 Watts of transmitter RF output power.

The MFJ-941E employs a cross-needle meter so forward power, reflected power and SWR may

be read simultaneously.

CROSS-NEEDLE SWR/WATTMETER:

The meter on the MFJ-941E may be used alone or with the tuner. Set the

ANTENNA

SELECTOR

COAX 1 DIRECT

COAX 2 DIRECT

to use the meter without the tuner. The

MFJ-941E utilizes a cross-needle meter so FORWARD power, REFLECTED power and SWR

may be read simultaneously in two ranges. FORWARD power may be read by setting the power

range switch to

(

300

Watts) or

(

Watts). Next read the power level on the FORWARD

SCALE. REFLECTED power is shown simultaneously on the REFLECTED SCALE. SWR is

determined by observing the intersection point of the two needles. No SWR sensitivity adjustment

is needed to read SWR. The

range is

300

Watts FORWARD and

Watts REFLECTED.

The

range is

Watts FORWARD and

Watts REFLECTED. The difference between the

and

scales readings is a factor of

The meter lamp can be powered by a 12 Vdc source, such as the optional MFJ-1312B power

supply. Use a 2.1mm coaxial plug with the center conductor of the plug connected to the positive

and the sleeve connected to ground. The

METER LAMP ON/OFF

switch will activate the meter

lamp.

ANTENNA SELECTOR:

The

ANTENNA SELECTOR

switch utilizes eight positions. They are

DUMMY LOAD

BALANCE

LINE

COAX 1

, and

COAX 2

positions for both

BYPASS

(direct) and

TUNED

(through) the tuner

operation. An external 50 Ohm dummy load can be connected to the

EXT LOAD

connector

located at the rear of the tuner. Do not continuously key into the dummy load for more than 2

minutes at a time.

CAUTION:

Never use the MFJ-941E for

OVER

300 Watts

of RF output power, even in the

DIRECT

DUMMY LOAD

positions.

1 2 3 4 5 6

Inhaltsverzeichnis

Seite 1 - MFJ VERSA TUNER II

MFJ-941E Versa Tuner II 1 MFJ VERSA TUNER II GENERAL INFORMATION: The MFJ-941E is designed to match virtually any transmitter to any antenna, includ

Seite 2

MFJ-941E Versa Tuner II 2 INSTALLATION: 1. The tuner should be placed in a location where operation will be convenient. The ceramic feed through in

Seite 3

MFJ-941E Versa Tuner II 3 MFJ-941E Front Panel USING THE MFJ-941E: The INDUCTOR switch on the MFJ-941E represents maximum inductance at position &quo

Seite 4 - Antenna Matching Problems:

MFJ-941E Versa Tuner II 4 4. If a SWR of 1:1 is not achieved, the INDUCTOR control should be increased or decreased and Step 3 repeated. If arcing

Seite 5 - Technical Assistance

MFJ-941E Versa Tuner II 5 A problem also occurs on 40 meters with this antenna example. The feedline is now a multiple of a half-wave (60 to 70 foot

Seite 6

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MFJ -941EK Bedienerhandbuch (28 Seiten)

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MFJ -941EK Bedienungsanleitung

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Inhaltsverzeichnis

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