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MFJ-945D Instruction Manual

MFJ-945D Mobile Tuner

Instruction Manual

Introduction

The MFJ-945D tuner is a 300 watt PEP output (175 watts on 160 m) antenna tuner. It is

designed to match 50 ohm output amplifiers, transmitters or transceivers to an antenna in a

mobile installation. Forward power, reflected power, and SWR are displayed on the

wattmeter's illuminated cross-needle meter.

The MFJ-945D uses a "T" matching network. It continuously tunes all frequencies from 1.8

through 30 MHz. It will match dipoles, inverted-vee's, verticals, mobile whips, beams, random

wires, and many other antennas. The MFJ-945D has a single connector for coaxial output.

SWR/Wattmeter

The cross-needle meter measures the peak or average FORWARD power, REFLECTED power,

and SWR. The meter's full scale forward and reflected power range is controlled by the left

POWER switch that selects 300W (HI) or 30W (LO). If your transmitter runs more than 30

watts of output power, set this switch to the 300W HI (in) position. If your transmitter has less

than 30 watts of output, set this switch to the 30W LO switch position (out).

Forward power is displayed on the left-hand FORWARD meter scale. This scale is calibrated

from 0 to 30 watts and is read directly in the 30 watt position. In the 300W (HI) position the

forward power scale must be multiplied by 10. Reflected power is read on the right-hand

REFLECTED meter scale. This scale indicates 5 watts full scale when the 30W power

sensitivity is selected, and 50 watts full scale when the 300W power scale is selected. This

scale is also multiplied by 10 when using the 300W power position.

The most accurate power readings occur in the upper half of the meter scales. When trying to

measure power with a less than perfect match, the reflected power should be subtracted from

the forward power readings.

The SWR is read directly from red SWR curves that range from 1:1 to infinity. SWR is

measured by observing the point where the forward and reflected power needles cross. The

SWR is indicated by the red curve closest to the needle crossing point. No cumbersome or time

consuming SWR sensitivity adjustments are required with this meter.

The wattmeter has an internal lamp that backlights the meter scale. The lamp circuit requires

power from an external 12 Vdc source. The rear panel jack accepts a 2.5 mm plug with a

positive tip polarity. The negative lead is grounded inside the tuner. The METER LAMP ON /

OFF switch turns the meter lamp off and on.

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Inhaltsverzeichnis

Seite 1 - Instruction Manual

MFJ-945D Instruction Manual 1 MFJ-945D Mobile Tun

Seite 2 - Interconnections

MFJ-945D Instruction Manual 2 Interconnections

Seite 3 - Using The MFJ-945D

MFJ-945D Instruction Manual 3 Installation SAFET

Seite 4 - Adjustment Procedure

MFJ-945D Instruction Manual 4 The INDUCTANCE swit

Seite 5

MFJ-945D Instruction Manual 5 4. Carefully adjus

Seite 6 - Grounding Hints

MFJ-945D Instruction Manual 6 WARNING: Never tr

Seite 7 - Antenna System Hints

MFJ-945D Instruction Manual 7 Water pipes provide

Seite 8 - Technical Assistance

MFJ-945D Instruction Manual 8 This places enormou

Seite 9

MFJ-945D Instruction Manual 9 You can also send q

Weitere Dokumente für Tuner MFJ 945D

Um das Dokument anzuzeigen MFJ 945D Bedienerhandbuch

MFJ 945D Bedienerhandbuch (20 Seiten)

Um das Dokument anzuzeigen MFJ 945D Bedienungsanleitung

MFJ 945D Bedienungsanleitung (11 Seiten)

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MFJ 945D Bedienerhandbuch

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Inhaltsverzeichnis

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