COMM-connect SWR TRUE Manuale utente

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SWR TRUE

Antenna Analyzer

EDITION NOTICE:

This publication applies to COMM-connect A/S SWR True type 3013 SWR Analyzer

product hardware release “1A“and software release 3013 suffix 3B.

Operators Manual

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TABLE OF CONTENTS

General Safety

General Information

Description

Options

Battery and Charging

Warranty

Connections

Operating

Front Panel

Power On/O

Center Frequency

Frequency Span

Marker

Hold and Copy

Menus

Backlight

Y Scale

X Scale

Time/Date

Info

Settings

Measurements

Specications

XML Feature

Accessories

Conversion Tables

Abbreviations

GENERAL SAFETY:

SWR TRUE should only be used for its intended purpose and never be con- nected

to cables carrying hazardous voltages.

When handling NiMh batteries great care should be observed preventing polarity

reversal and short circuit as the batteries may explode or catch re

GENERAL INFORMATION.

Description:

e SWR TRUE instrument is an Antenna Analyzer for analyzing Antennas and

feeder cable VSWR or Return loss. e instrument measure the return loss by using

a Wheatstone RF bridge, a detector and a RF Generator. e control of the entire

instrument is by a microprocessor. e microprocessor is running in a MOP (Micro

Operating Program) environment. e MOP schedule and execute all tasks required

to handle the LCD Screen, the Key- board, e RF generator, USB interface, serial

interface, time of day clock and measurement calculations.

e RF generator covers the frequency range from 30MHz to 2700MHz by using

two PLL generator covering 650MHz to 1450MHz and 1450MHz to 2700MHz. e

low frequency range from 30MHz to 650MHz is covered by mixing the two PLL

generators.

e instrument has a built in time of day clock. is clock is used to identify the

output les going to either USB or serial interface.

Options:

e XML Data option, this option will allow the user to enter specic data into

the instrument regarding Operator name, Location of Object, Type of Object. e

feature will have an XML le viewer or the data could be used in all PC programs

supporting XML data format ( Microso, LINUX etc.)

Remote Control, this option will allow the instrument to be controlled by the USB

B type serial interface. e setup going to the instrument and the measurement data

coming from the instrument can be a part of a large test system.

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Options continued:

Accessory Kit, this kit contains a So carrying bag, adaptors from the “N” female on

the instrument into “BNC” female, “TNC” Female, Mini “UHF”, “FME” male and a

7.5Volt regulated Cigarette Lighter Charger.

Battery and Charging:

e batteries used are NiMh. ere are four 1.2Volt cells. In order to charge the bat-

teries there is a built in constant current circuit, the time needed for a full charge is

approximately 14 hours. e 6Volt regulated charger supplied will allow the instru-

ment being operated directly from the charger and at the same time charge the bat-

teries when plugged in. Also the cigarette lighter supplied in the accessory kit can run

and charge the instrument from your 12Volt car battery at the same time.

Warranty:

e SWR TRUE has a 1 year total warranty covering parts and labor as long as the

instrument has been used according to the instructions in this manual, and has not

been subject to any abuse. Warranty will cover the return shipment aer repairs.

Connections:

Mini Din

Programming and RS232

Pin 1 RX Data

Pin 2 TX Data

Pin 3 Pgm Clock

Pin 4 Pgm Data

Pin 5 Pgm Control

USB A Busy

USB A Memory Stick

USB B PC Serial Device

DC 7.5Volt regulated Charger @ 700mA + on center pin

OPERATING

e Front Panel:

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Power On/O

Pressing the ON/OFF button will switch on the instrument. A welcome screen will

appear like this:

e instrument will run for the duration of the auto power o period.

Pressing the Fc button on the keyboard will give a screen with an entry eld

Center = pressing the numeric keys you can enter any frequency from 30MHz

to 2700MHz. To correct entry you can use the arrow keys. Press the enter key to

change the center frequency.

Note that the Center frequency will have priority over the Frequency span (FΔ)

making automatic adjust to t inside instrument range.

Pressing the FΔ button on the keyboard will give a screen with an entry eld

Span = pressing the numeric keys, you can enter any frequency span from 0MHz

to 2670MHz. To correct entry you can use the arrow keys. Press the enter key to

change the frequency span.

Note that the frequency span will be adjusted automatic to t within the range

boundaries and the actual center frequency.

Center Frequency

Frequency Span

Marker

e marker functions are controlled by the arrow keys when the instrument is in

sweep mode. By pressing the le or right arrow the marker line moves across the

screen. When the key is held pressed, a mini cursor will be seen moving across

the screen and when the key is released, the marker will appear in the new posi-

tion. e marker will display the frequency and the measured value of the marker

position on the bottom line. If you press the “ENTER” key, the marker position

will move to the center of the screen and adjust the frequency span symmetrical

on both side of the new center fre- quency.

When “HOLD” is pressed, the sweep position indicator stops at the current posi-

tion and freezes the screen. In “HOLD” mode the frequency sweep is stopped and

depending on the setting of Oscillator, the RF is either On or O. (see menus)

e “COPY” key will write the screen contents to the USB Memory stick or to the

USB Serial Device. e “COPY” function will create a Directory with the date as

directory name YYYYMMDD e.g. 20080826. In the directory the screen les are

written as .BMP with the time stamp as le name HHMMSS e.g. 164852.BMP .

During write to USB the busy icon is on, when busy goes o, it is safe to remove

the USB device.

Hold and Copy

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MENUS

Main:

1 Light On will change the setting On/O of the back light when activated.

2. Y Scale:

e vertical scale can be chosen between return loss in dB and as a nu- meric

VSWR value, in each group you may choose the scale that ts your need or the

auto scale function.

3. X Scale:

e Horizontal scale can be chosen to have dierent layout.

X1 will have start frequency, curser frequency with value and stop fre- quency.

Settings 2 the contrast of the LCD screen can be adjusted, you may adjust from 50

to 99. Factory default is 70.

X2 will display FΔ and curser frequency with value. X3 will display Fc and curser

frequency with value. X4 will display Fc and FΔ frequencies.

Settings 3 the le system may be selected where 1 is the time/date format and 2 is

the XML format selectable, if the XML Feature is installed.

Settings 4 is the choice of having the RF generator stopped or running dur- ing

“HOLD” mode.

4. Date and Time:

e date and time can be entered and will run real time as long as the SWR True

is charged and have battery voltage to sustain operation.

MENUS (CONT.)

5. Info:

In this menu Data to be used with the XML Feature can be entered; data is

stored with the time stamp and screen copy in XML format.

6. Settings:

Settings 1 you set the time to auto power o function will switch o and save

battery power. e time to power o can be set from 1 to 127minutes. If the

power o time is set to 0 the automatic power save function is dis- abled.

Settings 2 the contrast of the LCD screen can be adjusted, you may adjust from

50 to 99. Factory default is 70.

Settings 3 the le system may be selected where 1 is the time/date format and 2

is the XML format selectable, if the XML Feature is installed.

Settings 4 is the choice of having the RF generator stopped or running dur- ing

“HOLD” mode.

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MAKING MEASUREMENT

Connecting antennas:

Observe the utmost care when connecting antennas via cables , as these cables

can be connected to transmitters and /or power sources! Make sure you have

chosen the antenna you intend to test!! Connection to transmitters and/

or other sources can destroy the instrument or cause hazardous electri- cal

conditions.

When connecting to the “N” female connector on the instrument make sure

you are using either “N” male antenna or cable connector.

If antenna or cable is tted with another type of connector use appropriate

adapter. Please observe that the use of adapters and cable connections of poor

quality may inuence the SWR and give higher readings than the ac- tual

antenna SWR. Once the antenna has been connected to the instrument you

switch the SWR True on and select the relevant frequency band by using

the Fc and FΔ. By sweeping the frequencies of interest while observ- ing the

graphs on the screen you should see VSWR or Return Loss curve. Antennas

are usually designed to have a SWR below a given value within the band for

which it is designed. As an example a GSM 900 antenna could have the follow-

ing specications: Range 890 - 960 MHz SWR less than 2.0:1 typical 1.5:1.

Nearby objects:

When testing SWR on low gain antennas (Gain <3dBd) the inuence from

nearby objects is small when the objects are more than 1⁄2λ away (15 cm

at GSM900). When testing high gain antennas ( e.g. Yagi’s and panel’s) you

should avoid objects in the direction of radiation.

Strong RF elds:

When testing SWR on antennas located in strong RF elds, the reading you

will get on the SWR meter may be incorrect, because the strong RF eld pres-

ent will be indicated as reected power coming from the antenna. If a precise

reading is needed, you must switch o the disturbing source of RF or move the

antenna under test out of the RF eld.

Bandwidth:

Some antennas may need tuning by adjusting the length of an element or by other

means in order to cover the entire band of interest, please refer to antenna manu-

facturers instructions for details.

Duplex operation:

When checking antennas to be used for duplex operation, make sure the antenna

SWR is adjusted for the lowest possible SWR in both receive and transmit band.

General hints:

Always refer to antenna manufacturers specication! Antennas may have more

than one resonance frequency! A very narrow resonance frequency may indicate

resonance of cable instead of antenna resonance (Cable bro- ken or shorted)!

KEEP CONNECTORS CLEAN AND TIGHT!

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SPECIFICATIONS

Model SWR TRUE Type 3013

Application Measurement of SWR in 50 Ωtransmission

lines

Frequency range 30->2700 MHz entered as centre and span

Center Frequency 30 to 2700 MHz.

Span 0 to 2670 MHz.

Frequency stability ±20ppm

Measurement range 1.0<SWR<9.9, 0<dB<-30dB

Impedance Nom. 50 Ω

Generator output Approx. -4dBm

Max. input on test terminal 100 mW

Tolerance on SWR reading 30-1000MHz)± 5%; 1000-1600MHz ± 10%;

and 1600-2700MHz ±15%

Operating temperature range 0° C-> + 50° C

Storage temperature range -30°C -> + 50° C

Connectors “N”-female RF test connector.

USB A type for memory key.

USB B type for serial PC communication.

Mini DIN for RS232 communication up to

38400 Baud

Power supply 4 NiMH type AA rechargeable batteries

(Batteries, NiMH rechargeable and

110VAC/7.5VDC charger supplied)

Auto Power off For battery economy, SWR TRUE automatically

turns off 3 min. after last entry

Normal operating use Fully charged: More than 10 hours.

Colour Silver/blue

Width 82 mm

Depth 31 mm

Height 165 mm

Weight 500 gram (incl. Batteries)

EMC Complies with directive 89/336EEC as

amended by 92/31EEC and 93/68/EEC

Standards Emissions: EN 61000-6-4: 2001

Immunity: EN 61000-6-2: 2005

XML FEATURE:

In order to use the XML feature this must be installed.

When the feature is installed You can take advantage of

the info menu 5 where operator , address, device and

types can be entered.

Also you can choose between the stan- dard .bmp picture

copy (File sys 1)or the XML type where all info is copied

onto the USB memory stick (File sys 2)

Along with the XML Feature is a USB Memory Stick with

program les:

Aer inserting the USB

memory stick into the SWR

True and pressing “COPY”

the Screen is copied to the USB memory stick along with Info data, time of day, date

and table data for each of the 101 data points on screen.

Taking the USB memory stick to your PC you can execute the “merge.bat” program

which will give you all stored data in the following format:

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XML FEATURE CONTINUED:

On the USB memory stick is a directory called Data, this directory will hold your

stored data including spread sheet data and bmp les.

e bmp les can be viewed using any picture viewer and from the viewer it can be

zoomed and printed.

e spread sheet les xxxxy- yyy.csv are

les where the name is xxxx Serial of the

in- strument yyyy is the sequential le

number. In the les are the measurement

data for each point on the screen sepa-

rated by commas. Each data entry is the

frequency, reection coe- cient RHO,

Return loss in dB and the VSWR.

e spread sheet les can be viewed with

the program CSVIEW located onto the

mem- ory stick

Data in these spread sheets les can be

imported and used for making all kind

of drawings, statistics and calculations by

standard spreadsheet programs.

OPTIONAL ACCESSORIES KIT:

Automobile cigarette lighter regulated 7.5Volt charger. With lighter jack and

5.5 mm DC plug.

Coaxial adapters to t “N” at the Test port:

N male / FME male

N male / BNC female

N male / TNC female

N male / miniUHF female

So canvas case

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CONVERSION TABLE:

Teturn Loss In dB Reection Coefcient, r VSWR

1 0.891 17.4

2 0.794 8.72

3 0.707 5.85

4 0.631 4.42

5 0.562 3.57

6 0.501 3.01

7 0.447 2.61

8 0.398 2.32

9 0.355 2.10

10 0.316 1.92

12 0.251 1.67

14 0.199 1.50

16 0.158 1.38

18 0.126 1.29

20 0.100 1.22

25 0.056 1.12

30 0.032 1.07

35 0.018 1.04

40 0.010 1.02

SWR, VSWR (Voltage) Standing Wave Ratio

RF Radio Frequency

MHz Mega Hertz

GaAs Gallium Arsenide

MMIC Monolithic Microwave Integrated Circuit

SMPS Switched Mode Power Supply

GSM Global System for Mobile

dBm deciBell referenced to 1 milli Watt

dBd deciBell referenced to half wave dipole

ppm parts per million

LCD Liquid Crystal Display

AC Alternating Current

NiMH Nickel Metal Hydride

ABBREVIATIONS

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