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For the ver y latest specif ications visit

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Application

Note

Testing live EDACS repeater stations is made quick and

easy using the IFR 2945B Communications Service

Monitor.  A step by step guide to a typical measurement

application

EDACS repeater testing using the 

IFR 2945B Communications Service

Monitor

Introduction

The IFR 2945B Communications Service Monitor is ideal-

ly suited to the testing of trunking repeaters.  It provides

an extensive array of tests, allowing verification of per-

formance, and rapid diagnosis of faults. 

This application note will assist the first time users by lead-

ing them through the initial stages in setting up the 2945B

and testing an EDACS repeater. 

The majority of this document is concerned with using the

2945B test set off-air, that is with no physical connection

to the repeater.  The limitations of this method will be

explained, but the method does allow rapid set up and

quick verification.

Содержание 2945B

Страница 1: ... Monitor is ideal ly suited to the testing of trunking repeaters It provides an extensive array of tests allowing verification of per formance and rapid diagnosis of faults This application note will assist the first time users by lead ing them through the initial stages in setting up the 2945B and testing an EDACS repeater The majority of this document is concerned with using the 2945B test set o...

Страница 2: ...rom the radio The frequency plan can be examined and then entered into the test set Next you need to know the data rate EDACS can operate at two different data rates 9600 baud or bits per second with a chan nel spacing of 25 kHz per channel or 4800 baud with channel spacing of 12 5 kHz As a general rule if the frequencies in the frequency plan are in the 900 MHz band then the data rate will be 480...

Страница 3: ...to be picked up by the test set or the frequency plan is incorrect To check the data rate you should turn the sound volume up on the front panel and then step through the channels using the control channel key When you hear a continuous drone select Tx TEST and press Scope Bar until the large scope display appears Press the Persistence key until High is highlighted when you should see an eye diagr...

Страница 4: ...is tortion measurements are available SINAD signal to noise and distortion which should not be used in isolation The values returned by these tests should be used to detect degradation in performance with relative results being important and not the absolute values Data deviation tests are provided for both low and high speed data with the tests using advanced DSP Digital Signal Processor filterin...

Страница 5: ... for pass 0 for fail ctrl D Put the test set back to local mode Data Displays and Decode Only Since the data displays and decode only facilities may not be available for all systems the IFR 2945B product is normally sup plied with this functionality disabled Forfurtherinformation please contact the Aeroflex help desk 1 800 835 2350 Data Display The purpose of this screen is to show the data frames...

Страница 6: ...erial transfer parameters both in the ter minal program and also on the test set On the test set the seri al configuration is changed using the serial setup screen press HELP SETUP Setup Setup Page 2 Serial Setup Finally log the transfer on the computer to a file if you are using the Windows terminal program select Transfer ReceiveText File and enter the filename Summary The 2945B test set is an i...

Страница 7: ...For the very latest specifications visit www aeroflex com ...

Страница 8: ...14 0047 SPAIN Tel 34 91 640 11 34 Fax 34 91 640 06 40 UK Burnham Tel 44 0 1628 604455 Fax 44 0 1628 662017 UK Stevenage Tel 44 0 1438 742200 Fax 44 0 1438 727601 Freephone 0800 282388 USA Tel 1 316 522 4981 Fax 1 316 522 1360 Toll Free 800 835 2352 w w w a e r o f l e x c o m i n f o t e s t a e r o f l e x c o m As we are always seeking to improve our products the information in this document giv...

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