MFJ MFJ-266 Bedienungsanleitung

INSTRUCTION MANUAL

CAUTION: Read All Instructions Before Operating Equipment

MFJ ENTERPRISES, INC.

300 Industrial Park Road

Starkville, MS 39759 USA

Tel: 662-323-5869 Fax: 662-323-6551

Model MFJ-266

VERSION 1A

MFJ-266 HF/VHF/UHF Antenna Analyzer Instruction Manual

DISCLAIMER

Information in this manual is designed for user purposes only and is not intended to supersede information contained

in customer regulations, technical manuals/documents, positional handbooks, or other official publications. The copy

of this manual provided to the customer will not be updated to reflect current data.

Customers using this manual should report errors or omissions, recommendations for improvements, or other

comments to MFJ Enterprises, 300 Industrial Park Road, Starkville, MS 39759. Phone: (662) 323-5869; FAX: (662)

323-6551. Business hours: M-F 8-4:30 CST.

MFJ-266 HF/VHF/UHF Antenna Analyzer Instruction Manual

Contents

1.0 Introduction…………………………………………………………………………………...1

2.0 Power Sources…………………………………………………………………………………2

2.1 Internal Batteries……………………………………………………………………..2

2.2 External Power Supply………………………………………………………………..2

3.0 Operating Mode………………………………………………………………………………3

3.1 Display Backlight……………………………………………………………………..3

3.2 Main Menu Screen……………………………………………………………………3

3.3 Frequency Counter Mode…………………………………………………………….4

3.4 Antenna Analyzer Mode……………………………………………………………...4

3.5 RF Signal Source……………………………………………………………………...5

3.6 L/C Measurement Mode……………………………………………………………...5

3.0 Frequency Selection………………………………………………………………………….. 6

4.1 Variable Tuning………………………………………………………………………6

4.2 Range Selection………………………………………………………………………. 6

4.3 HF Band Selection…………………………………………………………………….6

5.0 Accuracy Limits……………………………………………………………………………….7

5.1 SWR Measurements and Local Interference………………………………………..7

5.2 Checking for Local Interference……………………………………………………..7

5.3 Detector Linearity and Accuracy…………………………………………………….7

5.4 Calibration-Plane Error………………………………………………………………8

5.5 Sign Ambiguity………………………………………………………………………...8

6.0 Antenna Measurements……………………………………………………………………….8

6.1 Antenna Connectors…………………………………………………………………..9

6.2 SWR……………………………………………………………………………………9

6.3 Measuring SWR ………………………………………………………………………9

6.4 SWR, Bandwidth, and Resonance……………………………………………………9

6.5 Antenna Tuning……………………………………………………………………….10

6.6 Antenna Matching…………………………………………………………………….10

6.7 Matching Antennas Through a Tuner (ATU)……………………………………….10

6.8 Antenna Impedance Readings………………………………………………………..11

6.9 Unpredictable SWR………………………………………………………………….. 11

7.0 Using Advanced Functions……………………………………………………………………11

7.1 Frequency Measurement……………………………………………………………...12

7.2 Field Strength Measurement…………………………………………………………12

7.3 Stimulus Generator as a Signal Source…………………………………………….. 12

7.4 Measuring Unknown Capacitance………………………………………………….. 13

7.5 Measuring Unknown Inductance…………………………………………………… 13

7.6 Tuning a ¼-Wave or ½-Wave Stub…………………………………………………. 13

7.7 Determining Velocity Factor (Vf)…………………………………………………... 14

MFJ-266 HF/VHF/UHF Antenna Analyzer Instruction Manual

7.8 Testing RF Transformers…………………………………………………………… 14

7.9 Checking HF Baluns………………………………………………………………… 15

7.10 Checking Coax Cable…………………………………………………………… 15

8.0 Quick Guide to Analyzer Controls and Functions………………………………………… 16

9.0 Technical Assistance

9.1 Technical Assistance…………………………………………………………………. 17

9.2 Limited Warranty……………………………………………………………………. 19

MFJ-266 HF/VHF/UHF Antenna Analyzer Instruction Manual

1.0 Introduction

Important: Read Section-2 before attempting to use your analyzer -- applying incorrect

operating voltages could result in permanent damage! Also, never apply a DC voltage to the

antenna connector.

General Description: The MFJ-266 is a self-contained handheld RF analyzer that performs the

following diagnostic functions:

SWR (1:1 to 9.9:1)

Complex Impedance (Z = R + jX)

Impedance Magnitude (Z = Ω)

Capacitance (pF)

Inductance (uH)

Relative Field Strength (mV)

Frequency (MHz)

The MFJ-266 also generates a 2-dBm RF signal that may be used to check receivers, networks,

amplifiers, and antenna patterns. Operating range is:

HF: 1.5 - 71 MHz in six HF bands

VHF: 85-185 MHz continuous coverage

UHF: 300-490 MHz continuous coverage

A 10:1 vernier drive provides smooth tuning. Measurements are displayed on an easy-to-read

LCD screen with optional backlighting. Power is supplied by internal AA cells or by a regulated

12-VDC external power source (not included). Weighing just over 1.3 pounds, the MFJ-266

package fits comfortably in one hand for convenient bench work or on-the-fly testing in the field.

Operation is simple, but you will need to read the manual to learn all of the unit's features and

functions. The more you know, the more valuable it will become as a diagnostic tool.

MFJ-266 HF/VHF/UHF Antenna Analyzer Instruction Manual

2.0 Power Sources

The MFJ-266 may be powered with internal AA batteries or with an external DC supply. To

avoid needless damage and ensure top performance, please follow the guidelines below when

choosing a voltage source:

2.1 Internal Batteries

Battery power requires eight (8) AA-size 1.5-volt alkaline cells. Rechargeable 1.2-volt cells

should not be used because the combined voltage will be too low to meet the unit's 10.8-volt

minimum threshold. Batteries are installed in two fully encased 4-cell plastic trays mounted

inside the analyzer enclosure. To access these, remove all four screws securing the analyzer's

back cover and carefully open the case. Slide the battery box covers sideways to unlatch, then lift

vertically to expose the cells.

Slide and

Lift

Never change batteries with an external power supply connected or when the power switch is

turned on. Doing so could damage the unit. Note that alkaline cells are not rechargeable and the

analyzer has no built-in charging circuitry. When replacing old batteries, be sure to follow the

manufacturer's environmental guidelines for safe disposal. For longest battery life, always

replace with a matched set of factory-fresh cells.

2.2 External Power Supply

Powering the MFJ-266 externally requires a well-filtered DC supply capable of delivering 10.8

to 12.5 VDC under varying load conditions. Current drain ranges from 30 mA to 180 mA,

depending on operating mode, frequency range, and whether or not the display backlight is on.

Many low-cost 12-volt "wall-wart" adapters are very poorly regulated and may deliver damaging

voltages under variable load conditions. If in doubt, check your supply with a voltmeter before

connecting to confirm it delivers no more than 13 volts or less with no load connected. The unit's

external power jack is located on the front panel and accepts a standard 2.1-mm power plug.

Positive voltage (+) must be applied to the connector's center pin.

MFJ-266 HF/VHF/UHF Antenna Analyzer Instruction Manual

-2.1 mm

Inserting the plug into the power jack automatically disables the internal AA battery pack and

switches the analyzer over to the external voltage source.

Important Warnings: Reverse polarity or excessive voltage could permanently damage the

MFJ-266! To avoid damage:

1. Never apply more than 13 Volts

2. Never connect an AC transformer or positive-ground power source

3. Never install or remove batteries with external power connected

4. Never change batteries with the PWR switch on

3.0 Operating Mode

Once you have suitable power (battery or external), you're ready to explore the analyzer's basic

operating features. Begin by pressing the red PWR button on.

BAND-MODE

SELECT

Up Down

ANT Counter

Bk Lite

PWR ON

OFF

3.1 Display Backlight

When the analyzer comes on, the screen displays a brief 1-second prompt before automatically

switching to the main menu. This prompt allows you to turn on the optional display backlight. If

you elect to use it, press the Up button immediately, before the screen changes to the main menu

and hold it down until the backlight comes on. If you ignore the prompt, the backlight will

remain off. Off is the default setting to reduce battery drain.

3.2 Main Menu Screen

The main menu screen has two purposes:

(1.) Power Supply Voltage: Appears on the right side of the screen. If it falls outside the

10.8 to 12.5-V operating window, be sure to change batteries or make power supply

adjustments.

MFJ-266 HF/VHF/UHF Antenna Analyzer Instruction Manual

(2.) Operating Mode Prompt: On the left side of the screen. This prompts you to select

between the two primary operating modes (see below).

D >FC DC:12.00V

U >ANT Analyzer Supply Voltage"Down" for Counter

"Up" for Antenna Analyzer

(1.) (D >FC) Press the “Down” button to select Frequency Counter mode.

(2.) (U > ANT Analyzer) Press the “Up” button to select the Antenna Analyzer

mode.

3.3 Frequency Counter Mode (D -> FC)

In this setup, the MFJ-266 functions as a 1-500 MHz frequency counter. Note that the BAND

SELECT switch Bmust be "up" in the HF position for the counter mode to activate. If switch B

is down, an error message will prompt you to change the band setting to HF.

BAND SELECT

BAND A B

HF X

VHF

UHF

Counter X

When a signal is applied to the Antenna jack, the frequency is displayed in MHz. Two gate

speeds are available. The default gate speed is Fast (or Fg -- see the top right-hand side of the

display). The fast gate provides 1-kHz resolution. The alternative gate speed is Slow (or Sg),

which provides 100-Hz resolution. To change the gate speed:

(1.) For Fast Gate, press the UP button.

(2.) For Slow Gate: press the DOWN button.

Fg f: 010.000 MHz

REF FS: 100mV

Gate Speed Frequency Readout

Relative Field Strength

The Counter mode also provides relative Field Strength (REF FS). This feature is useful for

conducting relative field-strength tests, estimating input levels to the counter, and detecting local

signals that could impact SWR accuracy (see Section 7.2).

3.4 Antenna Analyzer Mode (U -> ANT)

In this mode, the analyzer's built-in stimulus generator drives a bridge circuit and the unit

functions as a network analyzer. The top line of the screen displays band selection (a single

letter) and the operating frequency in MHz (see Section-4). The bottom line simultaneously

MFJ-266 HF/VHF/UHF Antenna Analyzer Instruction Manual

displays complex impedance (Z = R+JX), impedance magnitude (Z = Ω), and SWR for any

load connected to the antenna jack. Note that only SWR is displayed in the UHF operating range.

50+j 0 50 1.0

Stimulus Frequency

Band (Frequency) Selection

SWR (1.0:1)

10.000MHz D SWR

Impedance MagnitudeComplex Impedance

3.5 RF Signal Source

RF output from the MFJ-266’s built-in stimulus generator is available at the ANT connector in

Analyzer mode. This signal is a +2 dBm continuous carrier. When using the analyzer as a signal

source, the operating range, band, and frequency are selected in the normal manner and will be

displayed on the screen (see Frequency Selection, Section-4).

3.6 L/C Measurement Mode

The MFJ-266 may be used to measure the value of unknown capacitors and inductors. To

measure L/C values, connect the device to be tested to the antenna jack and follow the procedure

outlined below:

Measure Capacitance

Turn the analyzer off, then press and hold the Up button while turning PWR back on. The

screen will display the value in pF along with the stimulus frequency being used for the

measurement.

Measure Inductance

Turn the analyzer off, then press and hold the Down button while turning PWR back on. The

display will show inductance in uH along with the stimulus frequency.

5.000MHz D C=

122 pF

Capacitance

Frequency Band 5.000MHz D L=

10.200 uH

Inductance

Frequency Band 5.000MHz D C=

Xc>1.5k

Frequency Band

Reactance out of Range

Change Stimulus Frequency

MFJ-266 HF/VHF/UHF Antenna Analyzer Instruction Manual

4.0 Frequency Selection

The MFJ-266 covers the HF region (1.5-71 MHz) in six bands, plus VHF (85-185 MHz) and

UHF (300-490 MHz). Tuning and band-selection are electronically switched for high reliability.

4.1 Variable Tuning

The TUNE control uses an instrumentation-grade potentiometer with a 10:1 drive reduction to

ensure gradual tuning on each band. Note that a mechanical lock is provided on the side of the

TUNE knob assembly. The lock is used to prevent accidental changes once a desired frequency

is set.

Dial Lock

TUNE

4.2 Range Selection

BAND SELECT buttons Aand B are used to toggle between the HF, VHF, and UHF ranges.

Follow the up/down position prompts shown in the table printed next to the buttons to select

ranges.

BAND SELECT

BAND A B

HF X

VHF

UHF

Counter X

Xmeans the VHF/UHF switch can be in either position. Tuning is continuous in the VHF and

UHF ranges. The frequency readout line of the display shows both the operating frequency in

MHz and the letter of the selected range.

Band V: 85 to 185 MHz (FM, Airband, 2 Meters, 2-Way)

Band U: 300 to 490 MHz (Military, 70-cm, 2-way)

4.3 HF-Band Selection

The UP and DOWN buttons are used to step or scroll through a selection of six HF bands. To

step up or down in one-band increments, quickly tap the appropriate switch to initiate each

change. To scroll, press and hold the switch down. Most users find it easier to watch the letter

designation for the desired band rather than watch the frequency display when making a

selection:

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