IFR COM-120B Training Program advancing wireless test 2 1st Jan 01 advancing wireless test 3 Course Outline
1st Jan 01 Basic Instrument Front Panel Connections Rear Panel Connections Navigation RF Generator Screen Zooming Meter Functions Receiver Screen Duplex Operation Scope Spectrum Analyzer Tracking Generator Applications
Stored Setups Stored Frequency List Memory System Storing and Retrieving Images PCMCIA Card Slot Printing and Capturing EDACS BER Applications Library EasySpan for Windows EasySweep advancing wireless test
4 COM-120B Basic Instrument 1st Jan 01 250 kHz to 1 GHz Full Featured Service Monitor RF Signal Generator Sensitive 2 uV Receiver Cross Band Duplex High Speed Digitized Spectrum Analyzer High Speed Digitized Scope Generate and Demod FM, AM, PM
AC, Battery and Ext. DC operation 38.5 lbs. advancing wireless test 5 COM-120B Standard Features 1st Jan 01 RF Signal Generator
Output Level +13 to -130 0.2 PPM TCXO 2 uV Receiver with 15, 30 and 300 kHz IF filters 50 kHz Scope Full band / Dual Mode Spectrum Analyzer Digital Voltmeter Audio Level Meter Dual Audio Function Generators Data Generator DCS, DCS INV DTMF Generator
Encode / Decode DCS, DTMF, CTCSS RF Frequency Error Meter and Counter FM Deviation Meter AM Modulation Meter Phase Modulation Meter Audio Frequency Counter RF Power Meter (2 mW - 200 W) 50 W Continuous RF Level Meter Distortion Meter SINAD Meter RS-232 advancing wireless test 6
Options and Accessories 1st Jan 01 0.01 PPM OCXO (120B-xTx) Internal Rechargeable Battery (AC3001) Tracking Generator (AC3012) Return Loss Bridge (AC4105)
EasySweep Software (AC1019) EasySpan for Windows (AC1009W) Digital / Analog Signaling (AC3011) CCIR, CCIRH, CCIRH4, EEA, EIA, NATEL, ZVEI, DZVEI, DDZVEI, EURO, 5/6 Tone, POCSAG RCC Signaling (AC3009) Tone Remote, IMTS, MTS, 10 PS, 20 PS Data Generator / BER Meter (AC3007) MPT-1327 Trunking (AC9161) Clear Channel LTR Trunking (AC3014)
EDACS Trunking (AC3016) 7.5 kHz IF Filter (AC9162) SSB Filter (120B-8xx) Microphone (AC8645) Antenna (AC1201) Heavy Duty Ship case (AC8753) Soft Padded carry case (AC9925) IEEE-488 Interface (AC3013) EasyCom Land Mobile test software (AC1022) Application Library (AC1023) Nortel Cellular Base Station Software (AC1037) Programming Manual (AC0301) Maintenance Manual (AC0600)
Extended Warranty 3/5 year advancing wireless test 7 RF Input and Outputs A the f f O Half Duplex Testing and Tracking Generator Output Receiver 1st Jan 01 ir
ring o t i Mon Transmitter connection Full Duplex Testing Transmitter advancing wireless test 8 Audio Input and Outputs Scope / DVM Input AUDIO / DATA SINAD IN EXT MOD IN
1st Jan 01 AUDIO / DATA GEN OUT DEMOD OUT advancing wireless test Ext Mod source for radio under test Ext Audio Analysis 9 Rear Panel Master Power Switch Battery Compartment Ext. DC Input
10 MHz Ext Ref Input 1st Jan 01 Optional GPIB Interface RS-232 Serial IO Direct pin to pin connection to PC advancing wireless test 10 Navigation The Arrow keys are used to position a cursor to an EDIT FIELD. The TAB Key allows direct access to any field on the screen and is an alternative to incrementing the cursor through other fields. Function Keys pertain to the Field Selection.
1st Jan 01 advancing wireless test 12 RF Generator (Receiver Testing) RF D= D on/off SET REF T-Fwd T-Rvs C-Fwd uV
mV V AUX T/R Gate AUX Gate SWEEP LOCK FL On/Off C-Rvs FL
Level dBm Output T/R 1st Jan 01 advancing wireless test SINAD= S=On/ Off 13 Stored Frequency List Up to 100 frequency pairs may be stored Labels allow for easy selection of the correct frequency pair. Program the Frequency
List by pressing the SHOW LIST key on the front panel SHOW LIST Access the stored frequency list by enabling FL on the Frequency field of the Generate or Receive screens 1st Jan 01 advancing wireless test 14 Modulation Sources This area identifies what sources are turned on GEN1 indicates that FGEN 1 is turned on GEN1B indicates that FGEN1 is turned on but is in BURST mode
The Gen 2 Source field can be configured for a CTCSS Tone OR The DATA generator could be used to configure a DCS code for digital squelch systems. The Gen 1 Source field can be configured for a standard 1 kHz tone 1st Jan 01 advancing wireless test 15 SINAD Meter Filtering
The SINAD meter is commonly configured with a C-MSG filter. Setting the SPEAKER/PHONES to C-MSG allows the AUDIO/DATA SINAD Input port to be routed to the speaker. 1st Jan 01 advancing wireless test 16 Zooming Placing the cursor on the SCOPE / ANALYZER or METER field allows access to additional controls for that device. 1st Jan 01 advancing wireless test
17 Meter Functions Scope or Analyzer can be displayed Additional Controls Bar Graph Meter 1st Jan 01 advancing wireless test 18 Generate - AF Level Meter
1st Jan 01 Adjust volume or audio to specific levels prior to Distortion or SINAD measurements. Measure Vrms Measure dBm (user enters desired load value) Measure dB relative advancing wireless test 19 Testing Receiver Audio BW The Audio BW of the receiver can be measured by setting a reference at 1 kHz then adjust the tone frequency from 300 Hz to 3 kHz while the Audio Level meter is in dB mode.
1st Jan 01 advancing wireless test 20 Generate - SINAD Meter Positioning the cursor to the RF Level field allows automatic search for specified SINAD reading. Setting the SINAD meter to Average mode with 10 averages will make the readings more stable when manually searching for 12 dB SINAD readings. Note: Averaging should be turned off when performing automatic SINAD search operations.
1st Jan 01 advancing wireless test Scope source can be set to view Internal Modulation source, Audio/Data Input port or Notch Residual to evaluate receiver performance. 21 Testing Receiver Sensitivity RF Signal Generator Receiver Under Test Audio Output Audio Filter
R.M.S. Voltmeter Notch Filter R.M.S. Voltmeter SINAD = Signal + Noise + Distortion Noise + Distortion 1st Jan 01 advancing wireless test 22 Testing Receiver Distortion After setting the Audio output level to 60% of the rated audio level, the receiver distortion can be measured. Reducing the audio level by 20dB should
result in a distortion indication of less than 10%. 1st Jan 01 advancing wireless test 23 Generate - Spectrum Analyzer Modulation Index for a 1 kHz Rate Rate= Desired Dev (Hz) / Mod Index 3300 Hz Dev / 2.405 = 1372.1 Hz for Carrier Null (52 dB) 1st Jan 01 advancing wireless test 24
Questions? 1st Jan 01 advancing wireless test 25 Receiver (Transmitter Testing) RF D= D on/off SCAN SWEEP LOCK FL On/Off T-Fwd T-Rvs INPUT
T/R ANT Atten IF BW CF 30 0 26 dB Demod FM BW required to demodulate signal 1st Jan 01
PM AM IF BW 300 kHz 15 kHz 30 kHz advancing wireless test C-Fwd C-Rvs FL 26 AFGEN Out
The internal function generators can be used to externally modulate the transmitter. Two variable rate function generators, DTMF, DCS, Ext Mod source and Microphone sources are available. 1st Jan 01 advancing wireless test 27 Post Detection Filters Careful attention to filter settings must be maintained to avoid measurement errors. 1st Jan 01 advancing wireless test
28 Tone Decoding Care must be taken to ensure that the Filter for the Audio Counter is set correctly prior to decoding. 1st Jan 01 advancing wireless test 29 RF Frequency Error Meter Frequency tuning can be easily done by setting the Range to a fixed range.
Set the Gate time to 0.1 S to take fast readings 1st Jan 01 advancing wireless test 30 Audio Frequency Counter The Audio counter offers more resolution when zoomed. For rates less than 300 Hz, 0.1 Hz resolution can be obtained with a 1 S gate time. 1st Jan 01 advancing wireless test 31
RF Power Meter The dBm scale provides a convenient way to measure cable loss by using a reference cable. A 0.4 dB cable loss can cause 10% error in Power measurement. If not accounted for. 1st Jan 01 advancing wireless test 32 RF Level Meter Measures the signal strength an off the air signal through the Antenna port.
The level may vary with different IF bandwidth selections. For maximum accuracy, perform the SET LVL calibration procedure. 1st Jan 01 advancing wireless test 33 Deviation Meter The Deviation meter must be zeroed when DC coupled. When AC coupled, zeroing is not required. Transmitter Maximum deviation is the greater of the two values 1.11 1.10
Deviation Symmetry = Deviation (higher) - Deviation (lower) Deviation (higher) 1.11 1st Jan 01 advancing wireless test X 100 = 0.9% 34 Duplex Operation Move the cursor to these fields to expand the screen to access all of the Receiver or Generator functions. Simultaneously Generate and Receive operation for Full Duplex Any Offset between Generate and Receive frequencies in 2.5 kHz steps
1st Jan 01 advancing wireless test 35 Questions? 1st Jan 01 advancing wireless test 36 Oscilloscope Display Modes: LIVE AVG RECALL MIN
HOLD COMPARE PK HOLD LIVE-REF STORE REF-LIVE 1st Jan 01 Trigger Modes: NORMAL AUTOMATIC 1 SHOT advancing wireless test 37 Scope Input Selections INTERNAL INPUTS: Detector Out Audio/Data Gen Out
Notch Residual AF Cntr DTMF/SINAD 1st Jan 01 Data Decoder RF Power Demod Out Conn. Mod Meters EXTERNAL INPUTS: SCOPE/DVM - GND SCOPE/DVM - AC SCOPE/DVM - DC advancing wireless test 38 Peak Hold Feature
The scope PK and MIN Hold feature allows monitoring of maximum and minimum modulation variations. Monitor FM or AM Broadcast Monitor Transmitter Deviation 1st Jan 01 advancing wireless test 39 Spectrum Analyzer Independent control of Sweep Rate and RBW Reference Level Offset adjustment Offset Tracking Generator Signal Find feature Split Screen / Dual mode operation Zero - Full Span display modes in 1,2,5 sequence
1st Jan 01 advancing wireless test 40 Spectrum Analyzer Span Sweep RBW COUPLE DFLT Frequency SET REF FIND FIND LVL CONFIG Sweep Width Split Track Gen ON/OFF DEFAULT
LOCK CONFIG Center Freq Offset 1st Jan 01 Mode AVG RECALL PK Hold COMPARE MIN Hold LIVE-REF STORE REF-LIVE LIVE Marker REF Scale Units advancing wireless test
41 Peak and Min Hold Like the scope, the Spectrum Analyzer supports a Peak and Min hold feature. Verify signal amplitude does not vary Verify that a channel does not go off the air. Verify presence of spuratic interference signals. Identify the frequency of pulsed or short duration signals. 1st Jan 01 advancing wireless test
42 Using the Tracking Generator for Antenna Isolation The problem: How to ensure that RX and TX antennas are sited correctly to maximize isolation and thereby prevent RX desensitization? Solution: Tracking generator swept across TX band with RX antenna connected to analyzer input. RX in 1st Jan 01 advancing wireless test TX out
43 The Return Loss Bridge (AC4105) Return Loss Bridge Signal Generator DUT Port Source Return Loss is the difference between a measured reference signal, and the measured DUT . Reflected Spectrum Analyzer It can be used to check the degree of
mismatch of filters, antennas, receiver inputs, amplifier inputs and isolators. CAUTION: Measurements cannot be made beyond the directivity (resolution) of the bridge itself. 1st Jan 01 advancing wireless test 44 Antenna Measurements using a Return Loss Bridge (AC4105) Antenna VSWR / Return Loss Measurement Reflected Source 1st Jan 01
VSWR Bridge Out (DUT) advancing wireless test 45 Conversion Charts 1st Jan 01 advancing wireless test 46 Using the Tracking Generator for Cable Fault This image shows a series of nulls
due to an open at the end of a cable EasySpan for Windows Specialized software allows calculation of distance Antenna Input Tee connector on Tracking Generator (AUX) Output Distance ft.= Cable under test 1st Jan 01 advancing wireless test 492 * Vel. Factor Delta Freq. in MHz 47
Using the Tracking Generator for Filter Tuning This image indicates the characteristics of a filter Notch depth of 86.78 dB Frequency tuned to 461.8358 MHz 3 dB Bandwidth of 198.4 kHz Measurements Notch Depth Bandwidth Insertion Loss at Passband 1st Jan 01 advancing wireless test 48
Duplexer Tuning Split screen mode Simultaneously view wide and narrow windows Additional range can be obtained by reducing the Resolution Bandwidth and slowing the sweep speed. 1st Jan 01 makes Duplexer tuning easy. Set a 0 dBm reference with cables. Switch between 0 and 30 dB input attenuation to tune for insertion loss or notch depth.
advancing wireless test Store and Recall Up to 50 Storage Locations are available. Storage Locations are labeled 0 - 49. Screen settings that are saved are: Generator, Receiver, Duplex Generator advancing wireless test 50 Stored Setups 1st Jan 01 advancing wireless test 51 2.5 MB Internal File System Formatting of the File
System is similar to a standard DOS file System. Access the File system through the SHOW LIST key. 1st Jan 01 advancing wireless test 52 Stored Screen images Screens can be saved as PCX or BMP formats Saved screens (PCX or BMP) can be stored to the internal Flash File System Saved screens (PCX or BMP) format can be stored to the external PCMCIA card 1st Jan 01 advancing wireless test
53 Stored Screen images 1st Jan 01 advancing wireless test 54 Storing Screen Images Setup Key 11 Print Screen Setup Screen Images may be stored into the internal 2.5 MB file system by pressing the HOLD SCRN key and Printing to the file system
Setting the filename to *.* will create filenames automatically beginning with 00000001.pcx Setting the filename to test*.* will create filenames automatically beginning with test0001.pcx 1st Jan 01 advancing wireless test 55 Retrieving Screen Images Screen Images may be extracted from the COM-120B internal File system with a standard terminal program using XMODEM and a pinto-pin RS-232 connection. Setup the COM-120B RS-232
Host, 9600, 8 Data Bits 1, Stop Bit, Parity None, CTS/RTS Handshake, RCI Echo OFF, RCI Control ON Setup Hyperterminal for Direct connection Mode Direct Baud 9600, 8 Data Bits, 1 Stop Bit, Parity None, Hardware Handshake In Hyperterminal type the following command mmem:down:xmode filename.pcx filename.pcx would be substituted with a valid filename that appears in the COM-120B file directory. In Hyperterminal select File Transfer via XModem 1st Jan 01
advancing wireless test 56 File Download Example 1st Jan 01 advancing wireless test 57 PCMCIA Card Slot 1st Jan 01 Standard Computer PC Type 1 or type 2 card interface.
Will accept either Flash or Static RAM Memory Cards. Can be configured to use Hays Compatible PCMCIA Modem or a Serial card. Use to connect to a remote computer running EasySpan for Windows. Can be used to Load the Test Set Operating System or transfer screen images to a PC. advancing wireless test 58 Executing the EDACS Option 1st Jan 01
The EDACS option is accessed by pressing the SPCL key and selecting Item 4 for EDACS Trunking advancing wireless test 59 EDACS Option 1st Jan 01 Auto-test Radio or Repeater Repeater Simulator Manual test for Radio
Radio Simulator Manual test for Repeater Setup Screen Required for both Manual and Automatic tests Configure system parameters Configure Frequency list Store and Label Setups advancing wireless test 60 Setup - System Configuration Information in this screen is used by all other EDACS test modes and must be configured correctly for proper operation Note: (System Band Selection) Narrow (900 MHz)
- 4800 baud - 12.5 kHz ch bw Wide (400 / 800 MHz) - 9600 baud - 25 kHz ch bw The Control and Working Channel numbers must be different Required Information 1. TX / RX frequencies of at least two channels 2. The Site ID number 3. The System Data Rate 1st Jan 01 advancing wireless test 61 Entering the frequency list The channel frequencies are set to the Standard FCC frequency list by default pressing either the 800 or 900 MHz keys
User defined frequencies may be entered by selecting USER If USER is selected, the operator may enter any frequency that he wishes for both the Mobile RX and the Mobile TX Only Two channel frequencies are required to enable radio testing 1st Jan 01 advancing wireless test
62 Test setup for Radio Test Connect Transmitter Output to COM120B TR Type N jack Connect Radio Receive Audio Output to the COM-120B Audio / Data SINAD Input Connect COM-120B Audio / Data GEN OUT to Radio TX Audio TX Audio PTT 1st Jan 01
advancing wireless test RX Audio 63 Manual Test for Radio To test a radio, select the Repeater Simulator Enter the Working Channel number
Select the input port to TR Select the 30 kHz IF filter Set Output level to -40 dBm Set Output port to TR Adjust the COM-120Bs receiver Squelch control until the audio is squelched off Key the Radio The Group ID, Logical ID and Call Type will be decoded System messages appear here 1st Jan 01 advancing wireless test 64 Manual Radio Tests (Radio initiated call) With the Transmitter keyed, the
following measurements can be made Power Frequency Deviation Voice Low Speed Data AF Frequency Distortion Note: Positioning the cursor to the Deviation field allows filter selections for DATA (300 Hz Low Pass) or Voice (300 Hz High Pass). Selecting DATA will allow measurement of Low Speed Data. Selecting Voice will filter out the Low Speed Data. 1st Jan 01 advancing wireless test 65
Manual Tests (Radio Initiated Call) 1st Jan 01 High Speed Data Deviation can be measured with the Extended Measurement Scope mode Configure the scope as shown Key the Transmitter and press the HOLD SCRN button when the waveform appears advancing wireless test
66 High Speed Data Capture High Speed data burst should be approximately 3 kHz Deviation Low Speed Data should be approximately 750 Hz Deviation The DETECT selection for Scope Coupling allows the data to be unfiltered On the first data burst the radio transmits ID information on the Control Channel and requests a working channel.
The second data burst is transmitted on the working channel approximately 200 ms later. 1st Jan 01 advancing wireless test CC WC 67 Manual Tests (Repeater Initiated Call) Configure Function Generator 1 for a 1000 Hz tone with 3 kHz
deviation. Move the Cursor to the Call Type field and press the CALL function key. The radio squelch should open and a 1 kHz tone should be heard. Note: To enable a 1 kHz tone, position the cursor to the Mod Source field and select FM The Deviation and frequency can then be entered 1st Jan 01 advancing wireless test 68 Manual Tests (Repeater Initiated Call) After placing a call, the
demodulated audio can be analyzed with a Distortion, SINAD or Audio Level meter. The COM-120B RF Output level can be adjusted to find the 12 dB SINAD sensitivity of the radios receiver. Note: The COM-120B cannot receive or decode the transmitter if the Distortion, SINAD or AF Level meter are turned on. 1st Jan 01 advancing wireless test 69
Store setups Now would be a good time to save the setups Select the STORE key A label name and location can be entered The setups and frequency list that have been entered will be stored under this label name after pressing the SAVE key.
1st Jan 01 advancing wireless test 70 Automatic Test Feature The COM-120B can test the radio automatically The Registration test requires that the radio be configured for automatic login registration The Radio Test requires only an RF connection from the Transmitter Output to the COM-120B TR connector 1st Jan 01
advancing wireless test 71 Automatic Test Feature The Audio test requires audio connections to the Audio/Data GEN Out and the Audio/ Data SINAD IN connectors Any test feature may be Enabled or Disabled as required 1st Jan 01 advancing wireless test 72
Printing / Capturing Test Results Print Directly to an RS-232 Printer Print to a Standard Terminal Program Allows storage of test results Note: Set RS-232 parameters from the system Setup screen prior to entering the EDACS Option Automatic test results may be captured and saved using a terminal program RS-232 cable connection to a PC is a direct pin-to-pin connection 1st Jan 01 advancing wireless test
73 BER Meter Data Rates (BPS) 75, 150, 300, 600, 1200, 2400, 4800, 9600 RF or Base band operation is supported 1st Jan 01 advancing wireless test 74 EasySpan for Windows 1st Jan 01 advancing wireless test
75 Applications Library 1st Jan 01 advancing wireless test 76 EasySweep This memory resident application leads the operator and controls the COM-120B to make many standard measurements automatically. 1st Jan 01 advancing wireless test 77
Common Operator Problems 1st Jan 01 Unit will not Decode tone formats Improper filter settings for the AF Counter The Squelch is not set correctly The Analyzer display does not look correct The COUPLE function needs to be selected for the SCAN width selected The SET REF function was activated with a signal connected Nothing shows up when I turn on the Tracking Generator An offset has been entered into the Tracking Generator The RF Signal Generator has no output Output port is set to TR Gate or AUX Gate
The Function generator is turned on but has no output The Function generator is set to Burst mode advancing wireless test 78 Common Operator Problems 1st Jan 01 The Power meter reading is not correct The Frequency is not entered The cable loss was not compensated for The cable loss was compensated as negative value instead of positive The SINAD meter is too unstable to use
Averaging has not been turned on The Deviation meter is not accurate They have not taken residual FM into account The Scope Demod is not centered The Deviation meter is DC coupled and needs to have an FMZ operation performed The Scope vertical position needs to be adjust with the receiver squelched off advancing wireless test 79 Questions? 1st Jan 01 advancing wireless test
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