PERSONNEL. THIS UNIT CONTAINS NO OPERATOR SEAVICEABLE PARTS. WARNING: USING THIS EQUIPMENT IN A MANNER NOT SPECIFIED BY THE ACCOMPANYING DOCUMENTATION MAY IMPAIR THE SAFETY PROTECTION PROVIDED BY THIS EQUIPMENT. CASE, COVER OR PANEL REMOVAL Removing protective covers from the Test Set exposes the operator to electrical hazards that can result in electrical shock or equipment damage. Do not operate this Test Set with the case, cover or panels removed. SAFETY IDENTIFICATION IN TECHNICAL MANUAL The following terms draw attention to possible safety hazards, that may exist when operating or servicing this equipment, CAUTION: IDENTIFIES CONDITIONS OR ACTIVITIES THAT, IF IGNORED, CAN RESULT IN EQUIPMENT OR PROPERTY DAMAGE (E.G., FIRE). WARNING: IDENTIFIES CONDITIONS OR ACTIVITIES THAT, F IGNORED, CAN RESULT IN PERSONAL INJURY OR DEATH. SAFETY SYMBOLS IN MANUALS AND ON UNITS ZX CAUTION: Refer to accompanying doouments. 7p AC OF DO TERMINAL: Terminal inat may supply or be suppiied with ac or de voltage. DC TERMINAL: Terminal that may supply or be supplied with de voltage. ‘\) AC TERMINAL: Terminal that may supply or be supplied with ac or alternating voltage. \/ device is connected ON or disconnected OFF, EQUIPMENT GROUNDING PRECAUTION Improper equipment grounding can resuit in electrical shock. USE OF PROBES Check specifications for maximum voltage, current and power ratings of any connector on the Test Set before connecting a probe from a terminal device. Verify terminal device performs within these specifications before using it for measurement, to prevent electrical shock or damage te the equipment. POWER CORDS Power cords must not be frayed, broken nor expose bare wiring when operating this equipment. USE RECOMMENDED FUSES ONLY Use only fuses specifically recommended for the equipment at the specified current and voltage ratings. INTERNAL BATTERY This unit contains a fead-acid battery, serviceable only by a qualified technician. CAUTION: SIGNAL GENERATORS FOR MAINTENANCE AND OTHER ACTIVITIES CAN BE A SOURCE OF ELECTROMAGNETIC INTERFERENCE (EMI) TO COMMUNICATION RECEIVERS. SOME TRANSMITTED SIGNALS CAN CAUSE DISRUPTION AND INTERFERENCE TO COMMUNICATION SERVICES OUT TO A DISTANCE OF SEVERAL. MILES. USERS OF THIS EQUIPMENT SHOULD SCRUTINIZE ANY OPERATION THAT RESULTS IN RADIATION OF A SIGNAL (DIRECTLY OR INDIRECTLY) AND SHOULD TAKE NECESSARY PRECAUTIONS TO AVOID POTENTIAL COMMUNICATION INTERFERENCE PROBLEMS.TITLE INTRODUCTION HOW TO USE THIS BOOK ------------20---e een nn cence ncn n ncn te eee ene nent rere nnn en aen nanan ene conn naman eeunama nes 6 INSTALLATION ------ 22-2222 one ee ne eee nt ene een nee renee renee re rane nanan meena 7 Cable Statement, Power Up Procedures Applying AC Power, Battery Power Operation, Applying External DC Power ------------0rcnre-nannnn nena ne 7 CONTROLS, CONNECTORS AND INDICATORS --------+0 20 ------c eens eee nee ne ence nem nmem mene nnn eens ce nee anc nnn ences 8 RECEIVER TESTING Measuring Receiver Center Frequency, et al -----------+++++---2-02-2oeeo> -17 Receiver Center Frequency - 42 dB SINAD Sensitivity Modulation Acceptance Bandwidth Measuring Receiver Audio Output Level Measuring Receiver IF Bandwidin ------+++-+---2--2-0 ence ene ne ne cent erence ener nnn nn ne nen nen nee nena ene rme nares 23 Monitoring Paging Receivers --------------++---------- nn eeo nee ren ene nee en tren ne nnn ne eee eee 26 TRANSMITTER TESTING ---------2---se-eseeteesecceescceennccaseeseceee sceae cence seeeeeeesnecaeenenaeecnrenewennareceeene 30 wane nec c een nn ene enta sate tna nnenecennennnsenanansen see cneeanceseceancnanete 31 Measuring Transmitter HarmonicsTABLE OF CONTENTS (Cont’ TITLE PAGE TRANSMITTER TESTING (Cont'd) Measuring Transmitter Frequency Error ----------------2--2---en enc ee cence cn enc nner en en cnet eee 34 Measuring Transmitter Distortion Analyzing litermod Distortion - Isolation and Insertion Loss --- Monitoring DCS & CTCSS -------------+--- +++ == 00 v2 0 en nen een nnn enn nnn 43 DCS or CTCSS Generate --------------------+-----2 0-2 2n nen n nnn enn nnn nnn ene nee 44 DCS or CTCSS Receive How To Find An Unknown Transmitter Frequency FILE SYSTEM OPERATION How To Create A File File Management-----------------0e-ees-nn een e een nn ens ee anna nn ene n an nea nn ean nan e nn en eu nee tra cm etme nema e eee eee 51 How To Retrieve A File ----------------- 2-2-2222 e een nn nee ene ene nn teen ee ne ne ee een erent neers 53 BATTERY FUSE REPLACEMENT -------------- 2-220 2ne ne ne eee nn ne eee ern canner ene eee eee n ene ranean ene 54 EXTERNAL CLEANING SPECIFICATIONS ----This publication was developed to aid the communication service technician in using the COM-120B Communications Service Monitor to analyze certain common transmitter and receiver performance parameters and should be used in conjunction with the COM-120B Operation and TMAC Manuals. Tests included were selected because of appropriateness, application to as wide a specirum of equipment as possible and minimum amount of auxiliary equipment required to perform the test. The scope of this publication does not ailow the inclusion of specific troubleshooting techniques, nor quarantee that the included tests are suitable for all applications. Consult materiat from the UUT manufacturer for specific test requirements or other appropriate tests. This Application Guide contains actual field applications of the COM-120B Communications Service Monitor, The Application Guide is divided into three categories: Receiver Testing, Transmitter Testing and File System Operation. Each Application is preceded by the name of the test and is comprised of a brief overview with highlights of the application. There is a detailed test setup illustration following each Application. Refer to the front and rear panel illustrations to identify the controls, connectors and indicators referenced in the Application Guide.INSTALLATION CABLE STATEMENT For continued EMC compliance, double shielded and propery terminated external interface cables must be used with this equipment when interfacing with the RS-232, IEEE-488 GPIB and Reference Connectors. POWER UP PROCEDURES The Internal Battery, if installed, charges automatically whenever the COM-120B is connected to @ power source and the Main Power Switch is ON. The Power Supply is designed to sense applied voltage and automatically compensate with no further actions required. APPLYING AC POWER ] 1. insure proper fuse is installed in AC FUSE Holder. Connect power cord to AC Input Connector. Piug cord into power source. Insure proper grounding. 4. Set Main Power Switch to ON (“I" on switch). Power APPLIED indicator lights when power is available. 5. Press COM-120B Front Panel Power ON Key to activate unit. Power ON Indicator lights. BATTERY POWER OPERATION 1. Press COM-120B Front Panel Power ON Key. 2. Power ON Indicator lights. Option 01 required for battery operation. Power cycles off after approximately 10 minutes of operation. Flashing Power ON Indicator denotes low battery charge. APPLYING EXTERNAL DC POWER ] i. Insure proper fuse is installed in DC FUSE Holder. 2. Connect power cord to DC Input Connector. 3. Plug cord into power source. Power APPLIED Indicator lights when power is availabie. 4. Press COM-1208 Front Panel Power ON Key to activate unit. Power ON Indicator lights.COM-120B Front Panel00607132 COM-120B Rear Panel® Test Mode Keys @® instruments Keys @) DATA ENTRY Keys GEN Test Mode Key, accesses Generate Test Mode Operation Screen. REC Test Mode Key, accesses Receive Test Mode Operation Screen. DPLX Test Mode Key, accesses Duplex Test Mode Operation Screen. SPCL Test Mode Key, accesses Optional Operation Modes. SCOPE Key, accesses Oscilloscope Operation Screen. ANLYZ Key, accesses Spectrum Analyzer Operation Screen. MTRS Key, accesses Independent Meters Functions. AUDIO Key, accesses Audio/Data Generators Functions. Numeric Keys, use to enter numeric (0-9) values. *k Key, use for DTMF functions. # Key, use for OTMF functions. +/- Key, use to set sign of entered value. « Key, use to enter decimai point in numeric values. SHIFT Key, use for alphabetic function of Front Panel Keys (see table). ENTER Key, selects data field for edit or completes an editing action. 10KEY SHIFT KEY SHIFT KEY SHIFT GEN A 5 J AUDIO GEN REC B 6 K * 1 c . 0 u 2 D scope |M # v 3 E ANLYZ N STORE w +l F 7 ° RCL x DPLX G 8 Pp SHOW LIST | ¥ SPCL H io e SETUP z 4 1 MTRS Ra TAB [space] © contRot Keys @ ANTENNA Connector/A\ ESC Key, use to escape an editing action without change to parameters. HOLD SCRN Key, use to freeze current screen. Press any key to return to normai operation. START/STOP Key, use to start or stop the following operating functions: Reset One Shot in Oscilloscope Operation Bit Error Rate Meter (Option 07) LTR® Trunking (Option 14) Input connector to monitor “off-the-air" signals. Also used as a connection for low power (10 W maximum) signals. CAUTION: DO NOT EXCEED 0.25 W MAXIMUM CONTINUOUS INPUT OR DAMAGE TO THE COM-120B MAY RESULT. 44€Q) PHONES Connector @) SCROLL SPINNER @ va ConnectorA\ @ aux ar ourAy AUDIO/DATA aend\ Provides access for using Headphones when audio signal is present. Allows operator to scroll through cusrent test mode operation screen, scroll through lists of parameter selections and actively increase and decrease one digit of numeric parameters. 502 Connector for high power input or cutpul signals. CAUTION: DO NOT EXCEED 200 MAXIMUM CONTINUOUS INPUT OR DAMAGE TO THE COM-120B MAY RESULT. 500 Auxiliary oulpul connecter for RF signals. CAUTION: DO NOT EXCEED 0.25 W MAXIMUM CONTINUOUS INPUT OR DAMAGE TO THE COM-1208 MAY RESULT. 6002 connector for output of audio and data generators. Access is selectable from individual generator setup screens. CAUTION: DO NOT EXCEED 20 V MAXIMUM CONTINUGUS INPUT OR DAMAGE TO THE COM-120B MAY RESULT. 12miciacc AN @ vata scroi ext mooA\ aupio/pata wA\ selectable from individual generator selup screens. CAUTION: DO NOT EXCEED 20 V MAXIMUM CONTINUOUS INPUT OR DAMAGE TO THE COM-120B MAY RESULT. Provides access for microphone or accessory equipment. Both generate and receive lines are available. CAUTION: DO NOT EXCEED 20 V MAXIMUM CONTINUOUS INPUT OR DAMAGE TO THE COM-120B MAY RESULT. Allows operator to scroli though current test mode operation screen, scroli through list of parameter selections and actively increase and decrease one digit of numeric parameters. 100 kQ2 connector allows input for external modulation source. CAUTION: DO NOT EXCEED 20 V MAXIMUM CONTINUOUS INPUT OR DAMAGE TO THE COM-120B MAY RESULT. 100 kQ connector allows input of external audio and data signals. CAUTION: DO NOT EXCEED 30 V MAXIMUM CONTINUOUS INPUT OR DAMAGE TO THE COM-120B MAY RESULT. 13® B B @ @ MEMORY Keys PCMCIA Card Siot Soft Function Keys Power ON LED Power APPLIED Dc inputA\ pC FuseA\ STORE Key, selection allows operator to store current Operation Screen and all current parameters for future. RECALL Key, selection allows operator to recall previously stored Operation Screens. SHOW LIST Key, provides access to menu of all storage lists. SETUP Key, provides access to setup menu for system information and system configuration. Provides access to enhance software capabilily. Provides access to defined function, Denotes unit is ON when lit. Denotes power is provided to the unit when lit. Accepts dc power cord to supply de power (12 to 30 Vdc) to COM-1208. CAUTION: DO NOT EXCEED 12 TO 30 Vde OR DAMAGE TO THE COM-120B MAY RESULT. 10 A, 32V Slo-Blo Fuse is provided for dc operation. 14O@OOO® ® @ AC InputA\ Ac FuseA\ Main Power Switch Baitery Access Panel RS-232 Connector GPIB Connector Reference Connector 120B MAY RESULT. Accepts ac power cord to supply ac power (90 to 265 VAC) to COM-120B. CAUTION: DO NOT EXCEED 90 TO 265 VAC OR DAMAGE TO THE COM-120B MAY RESULT. Two 2 A fuses are provided for ac operation. CAUTION: ONLY USE A 2 A FUSE OR DAMAGE TO THE COM-120B MAY RESULT. Switches power applied ON and OFF. Provides access to battery. Provides serial interface for remote operations with COM-120B. IEEE-488 connector provides parallel interface for remote operation with COM-120B. Provides connection tor input of external 10 MHz Reference Signal. 1aWoo OO eon 00000 | oooonooo. oo Oo OO 0) O03 a Controls, Connectors and Indicators shown here in bold are used during Receiver Testing. 00607138: MEASURING RECEIVER CENTER FREQUENCY, et al This procedure configures the COM-120B RF Generate Operation Screen to measure Receiver Center Frequency, Modulation Acceptance Bandwidth and 12 dB SINAD Sensitivity (Receiver Sensitivity}. Why are these measurements important? The Receiver Center Frequency test determines if the local osciilators are close to the design frequency and if the iF is aligned properly. Measurement of Modulation Acceptance Bandwidth, while set up to do the normal 12 dB SINAD Sensitivity test, quickly determines the radio's overall low level signal performance. Bandwidth and 12 dB SINAD Sensitivity all contribute fo a receiver's performance at low signai levels, RECEIVER CENTER FREQUENCY The receiver center frequency is the frequency that produces the best SINAD reading. MODULATION ACCEPTANCE BANDWIDTH Modulation acceptance bandwidth is measured by increasing the deviation unti! distortion occurs in the 1 kHz tone due to bandwidth limitations. 12 dB SINAD SENSITIVITY SINAD is the acronym for Signal + Noise And Distortion. SINAD is the voltage ratio of signal, noise and distortion to noise and distortion and is expressed in dB, 12 dB is the most common SINAD specification point. SINAD is a more accurate method of measuring the readability of a signa! because distortion is measured in the 1 kHz signal in addition to quieting. A badly distorted audio signal fails a SINAD test. 17psoeaeO @ oon 00000 09 oce0e 8 ao G600 6 ac ooc0 a auDIO OUT ANTENNA IN Bebe Lever: 130.0, 68m L UR sf GENT | ad “Wed See. Cent Fw a ! i 1 Deviation: 5.00 eH -af | 1 kHz + msidiv Foimat: TONE SOURCE: — int Med Freq 1000.0 Hef Shape: Sive — ee Audio/Data, filters SiNAD i 12.3 48 LINE: AF DEC | HP: OFF LP: OFF AF LEVEL 0.90 Vrms eanurtse Use the Data Entry Keys, Data Scroll Spinner and Data Scroil Keys to edit the appropriate fields. Connect the COM-120B T/R RF IN/OUT to the Unit Under Test (UUT) ANTENNA IN via a coaxial cable. Connect the UUT AUDIO OUT to the COM-120B AUDIO/DATA/SINAD IN via a coaxial cable. 18He GEN AUDIO / DATA FILTERS SEfUP MENU, BAND HIGH LINE Pass. PASS FILTER, PRESS. "EXEC" 1. ACIVATE SELECTION SPEAKER PHONES | wT. mop onga7 198 To start, cursor to the Audio/Data Filter LINE field. Press F1 (LAE DES}, Press F6 [CONFIG |. Make the appropriate edits to the RF Gen Audio/Data Filters Setup Menu. Don’t forget to press F5 ~ EXEC to activate the selection. Fe (RETURN ] exits to the previous screen. Cursoring to the Level field gains access to F5 “SINAD= | and F6 [S#ON/OFF | Press F6 |S=ON/OFF f and the COM-120B goes to work in pursuit of the 12 4B target. Deactivate the SINAD search function when 12 dB is reached on the SINAD Meter. Adjust the RF field for the highest SINAD Meter reading to reveal the actual UUT Center Frequency. 12 dB SINAD SENSITIVITY Measure Receiver Center Frequency first to ensure accurate test results. Cursor to the Level field and press FS [CSINAD= | Set the SINAD= field to 10 dB or 12 dB (as specified by the Receiver Manufacturer) and press F6 | RETUAN ) Press FO |S=ON/OFF} to activate the SINAD search function, Press Fe |S=ON/OFF | to deactivate the SINAD search function after the Level settles. This Level is the Receiver Sensitivity Level, 19Buipus A GENT Mou Sic GENT FM RECEIVER RESPONSE CURVE MODULATION |ACCEPTANCE BANDWIOTH Sova 5.0094 4 RK 1 msidiv: Format: TONE < source) mime Few 10004 Shape: Sine _—_ Snape AF LEVEL SIRAD ata Futore | o.00 rms 52.0 a0 ue: AF DEC HP: OFF LP: OFF BP: OFF I 0807159 Measure Receiver Center Frequency first to ensure accurate test results. Cursor to the Level field and press FS [_SINAD= J set [SINAD=] to 12 dB and press Fe (RETURN) Press F6 | SzON/OFF } to activate the SINAD search function. Press F6 {S=ON/OFF | to deactivate the SINAD search function after the Level settles. Now, increase the COM-120B Level 6 dB. 20MEAQUFING neverven iu AUDIO OUTPUT LEVEL i This procedure configures the RF Generate Operation Screen to measure Receiver Audio Output Level. Why measure the receiver audio output fevel? The audio output jevel of a receiver is dependent on internal audio amplifier circuitry. The inherent audio amplifier circuitry increases the energy level of the audio frequency cutput signal which must have enough drive to effectively reproduce the original input. This test provides a visual representation of the audio output level. What goes in, must come out! ag thor ociur E 600 OHM LOAD AUDIO OUT (eee l| oe Eee 00 boooo noonooo Qa a ANTENNA iN conser tarUse the Data Entry Keys, Data Scroll Spinner and Data Scroll Keys to edit the appropriate fields. Connect the COM-120B T/R RF iN/OUT to the Unit Under Test (UUT) ANTENNA IN via a coaxial cable, Measure Receiver Center Frequency first to ensure accurate test results. to press FS EXEL am tO activate the selection. F6 exits to the previous screen. Now, adjust the UUT Audio Output for the desired output. Cursor to the AF LEVEL field and press F1 [__Z00M_} Press F2 dém~—} to reveal impedance for dBm reading. The COM-1208 uses a standard 600 Ohms default. The ‘Z = field is editable from 0 to 1000 Ohms. Attach an external load between the UUT Audio Output and the COM-120B AUDIO/DATA/SINAD IM input. The illustration uses a 660 Ohm load. The Audio Frequency Level Meter reading that results is the Audio Output Level of the UUT. 22Pe MEASURING RECEIVER : IF BANDWIDTH This procedure configures the AF Generate Operation Screen to measure Receiver IF Bandwidth, Why check the receiver IF Bandwidth? The IF filtering network determines the receiver's selectivity. If toc narrow, audio distortion is produced. If too wide, there may be adjacent channel interference. Symmetry of the IF filter is important for recovering audio with the lowest distortion, TEST SETUP (oo oGggg So (e] 00 5000 0 ooe0oc0o0 6 oo Oooo oO AUDIO OUT aaf hove 130.0 dBm GENT 8 HIGH une PASS PASS PASS FILTER [riren FILTER Wes sar cn ee Dew S00 ke Format TONE =i Freq 1000.0 H2 | Braga: Sine ites | LNg: AE DEC Hp: OFF LP: OFF AP LEVEL 9.00 Vins Use the Data Entry Keys, Data Scroli Spinner and Data Scral! Keys to edit the appropriate fields. Connect the COM-120B T/R RF IN/OUT to the Unit Under Test (UUT) ANTENNA IN via a coaxial cable. Measure Receiver Center Frequency first to ensure accurate test results, | pimes stad _jorr * soonz | 6 atte |" PRESS “EXEG" TO ACTIVATE SELECTION “17. SPEAKER (PHONES | INT- MOD oco7198 To gain access to the RF Gen Audio/Data Filters Setup Menu, press F6 alter setting the Audio/Data Filler Line field to AF DEC. Make the appropriate edits. Don’t forget to press F5 EXEC to activate ihe selection. Fe RETURN | exits to the previous screen. Cursoring to the Level field gains access to F5 [CSINAD= 7] and Fe [S=ON/OFF'), 24Activate the SINAD search function and the COM-120B goes to work in pursuit of the 12 dB target. Press F6 to deactivate the SINAD search function when 12 dB is reached on the SINAD Meter. This Level is the Reference Sensitivity. Increase this COM-i20B Level 60 dB. Now, increase the COM-120B RF field until the SINAD Meter reads 12 dB. Note the rasulling “frequency as: the» Upper Frequency. 2 Now, decrease the COM-120B RF field past the UUT Genter Frequency until the SiNAD Meter reads 12 dB. Note «the “resulting frequency “as. ‘the: Lower Frequency. Mathematically, subtract the Lower Frequency from the Upper Frequency to obtain the Receiver [F Bandwidth. oa IF Response Curve 38 NOTESThis procedure configures the RF Generate Operation Screen to monitor Paging Receivers. Why test pagers? Propagation, fading, shading and oft-frequency conditions are some of the things that affect a paging system. Individual pagers react differently to variations in signal level, modulation and frequency. The objective is to determine pager reaction. The key to successful pager testing requires the simulation of real-world conditions that affect pager operation. “Flaky” pagers are a source of frustration and may cause a loss of revenue and customers. geocoo aongea 26LAU, DATA Fu =e [Decision 400} --90.0 dBm, <400 MHz) #2.5 dB otherwise VSWR: <1.45:1 (0.25 to $100 MHz) <1.23:1 (>100 to $400 MHz) <1,38:1 (>400 MHz) Accuracy: Spectral Purity Residual FM: <20 Hz (rms, 0.3 to 3 kHz BW) Residual AM: <0.5% (rms, 0.3 to 8 kHz BW) Harmonics: <-26 dBo Non Harmonics: <-50 dBe (<1000 MHz) <-40 dBe (>1000 MHz) 59 W CW continuous 100 W CW (90 sec/3 min) 150 W CW (30 sec/3 min) 200 W CW (15 sec/3 min} (AUX): Up to 0.25 W Input Protection (T/R): 56Frequency Modulation Range: Resolution: Accuracy: Distortion: Suppiemental Characteristic Rate: EXT MOD Sensitivity Ampiliude Modulation: Range: Resolution Accuracy: 100 Hz to 100 kHz 10 Hz (0.01 to 2.55 kHz) 50 Hz (2.60 to 12.75 kHz) £5% + residual FM, (1 kHz rate, GEN1, GEN 2, EXT MOD) £10% + residual FM (DATA GEN) 415% + residual (DTMF GEN) <2% (1 KHz sine wave, 10 kHz deviation, 0.3 to 3 kHz BW) 10 Hz to 20 kHz-FSK rates up to 40 kbps 2 kH2/¥pk £10% (FM Narrow) 10 kHz/Vpk £10% (FM Wide) 30% to 90% 1% 25% + residual AM (1 kHz rate, GEN1, GEN2, EXT MOD, S400 MHz and <+7 dBm or >400 MHz and <0 dBm) 215% + residual AM (DTMF GEN, <400 MHz and <+7 dBm or >400 MHz, <0 dBm) EXT MOD Sensitivity: Supplemental Characteristic Rate: Phase Modulation Range: Resolution: Accuracy: EXT MOD Sensitivity: Supplemental Characteristic Rat 9% to 11% Vpk 100 Hz to 10 kHz 0.1 to 10 radians peak 0.1 radians £5% + residual PM (1 kHz rate, GEN1, GEN2, EXT MOD) £15% + residual PM (DTMF GEN) 2 tad/Vpkt10% 100 Hz to 6 kHz AUDIO/DATA GENERATORS A.F. Generator #1 Frequency Range: Frequency Resolution: Frequency Accuracy: Output Range (High Lyi): Output Resolution (High Lvl): 5 Hz to 20 kHz (sine wave only) 8 Hz to 10 kHz (other wave shapes) Ot Hz Same as Master Oscillator 40.1 Hz 0.01 fo 2.5 Vpk (into 150 Q) 0,01 Vpk ovOutput Rang (Low Lvl): Output Resoiution {Low Lvl): Output Accuracy {Low Lvl): THD: Wave Shape: A.F. Generator #2 Frequency Range: Frequency Accuracy: Output Range (Hig? Lvl): Output Resolution (High Lvl): Output Accuracy (High Lvl): 0.1 to 250 mVpk (into 180 9) ot mv 24% full range £0.25 mVpk {$10 kHz, 0.03 Vpk) 10 kHz, 0.08 Vpk 2 MHz, 1 kHz tone, 3.3 kHz deviation, 15 kHz IF BW, C-Message weighted filter, 10 KHz FM deviation meter range, 15°Cs to $35°C) <2.5 WV otherwise 10 W GW (5 sec with alarm) 300 kHz, 15 kHz BX BW (3.0 dB) 230.0 dB Down 300 kHz #485 kHz 15 kHz 415 kHz 0.20 Vpk/kHz £10% (10 kHz range) 0.10 Vpk/kHz 440% (20 kHz range) AM: OM: range) 0.02 Vpk/kHz £10% (100 kHz range) 1.13 40.06 Vrms (80% modulation) 0.2 Vpk/Rad 110% SELECTIVE RF COUNTER ] Frequency Range: Supplemental Characteristic Tunable Range: Resolution: Accuracy: RF Level: 250 kHz to 999.9999 MHz (The received frequency must be within the IF bandpass of the COM-120B.) 100 Hz to 999.9999 MHz (characteristics below 250 kHz are not specified) THz Same as Master Oscillator #2 Hz 0 to $3 dBm (T/R Connector) -60 to 0 dBm (Antenna Connector) RF FREQUENCY ERROR METER ] Meter Range: Meter Accuracy; Meter Resolution: 0 Hz to 100 kHz Same as Master Oscillator +2 counts 1 Hz (10 sec gate time) 10 Hz (1 sec gate time) 5aRF Level: 0 to 58 dBm (T/A Connector} -60 fo 0 dBm (Antenna Connector) AF FREQUENCY COUNTE! | Frequency Range: Accuracy: Resolution (1 sec gate time): Supplemental Characteristic input Signal Level SCOPE/DYM Inout: FREQUENCY MODULATION METER Range: Resolution: 10 Hz to 20 kHz Same as Master Oscillator £1 counts 0.1 Hz (1 see gate time, 10 to 500 Hz) 1 Hz (1 sec gate time, >500 Hz to 20 kHz) 0.1 Hz (10 sec gate time) 90 mVpp {50 mV range, any waveform) 450 mVpp (any waveform) 10 kHz, 20 kHz, 50 kHz, 100 kHz full scaie 10 Hz (10 kHz range) 400 Hz (20 kHz, 50 kHz, 400 kHz ranges) Modulation Rate: Carrier Range: Carrier Level: 0 to 20 KHz 250 kHz to 999.9999 MHz (The received frequency must be within the IF bandpass of the COM-1208.) 0 to 83 dBm (T/A Connector) -60 to 0 dBm (Antenna Connector) SMODULATION METER i Range: Resolution: Accuracy: Modulation Rate: Carrier Range: Carrier Level: 1, 2, 8, 10 rad peak full scale 0.01 rad (1 and 2 radian ranges) 0.1 rad (5 and 10 radian ranges) £5% of full scale #0.1 rad £1 count + source residual PM (300 kHz 1F BW, 4 kHz tone, 1 rad deviation, C-message weighted filter) 100 Hz to 6 kHz 250 kHz to 999.9999 MHz (The received frequency must be within the IF bandpass of the COM-1208.) 0 to 53 dBm (T/R Connector) -60 to 0 dBm (Antenna Connector) 60Range: Resolution: Accuracy: Modulation Rate: Cartier Range: Carrier Level: Supplemental Characteristic AGC Attack Time: 1% to 100% 0.1% 5% of full scale 41 count + source residual AM (300 kHz IF BW, 1 kHz tone, 50% AM depth, C-Message weighted filter} 50 Hz to 10 kHz 250 kHz to 999.9999 MHz (The received frequency must be within the iF bandpass of the COM-120B.) 0 to 83 dBm (T/R Connector) -60 to 0 dBm (Antenna Connector} 60 ms RF POWER METER ] Meter Ranges: Resolution: Accuracy: 2 mW to 200 W in a 1-2-5 sequence 1% of full seale or 0.1 mW whichever is greater £10% +0.7 mW +1 count (>200 mW or temperature 15°C to 3°C) £15% +0.1 mW +1 count (<200 mW or 18°C < temperature <35°C) Wr Lever Mange: 6 1W We euy Ww oaveraye puwer Supplemental Characteristic Usable Level: 0.2 mW to 200 W average power (characteristics below 2 mV not specified) 50 W CW continuous (80°C) 100 W CW (90 sec/3 min, 50°C) 150 W GW (30 sec/3 min, 50°C) 200 W CW (15 sec/3 min, 50°C) VSWR: 1.15:4 (0.26 to 100 MHz) 1.23:1 (100 to 400 MHz) 1.38:1 (>400 MHz to 999.9999 MHz) Audibie and visuat {if applied power exceeds 200 W in the 200 W range or temperature exceeds 105°C) RECEIVE LEVEL METER | Range: +104 te -30 dBm (15 kHz IF BW) -80 to -30 dBm (300 kHz IF BW) Supplemental Characteristic Operating Conditions: Alarms: +3 dB 250 kHz to 999.9999 MHz (The received frequency must be within the IF bandpass of the COM-120B.} Accuracy: Frequency Range aiAccuracy: +0.5% distortion +1 count (1% to 10%) £2% distortion £1 count (>10 lo 20%) Signal Frequency: 1 kHz Suppiementai Characteristic Signal Level: 0.04 to 200 Vims (SCOPE/DVM input) 0.15 to 15 Vrms (AUDIO/DATA input) SINAD METER ] Range: 8 to 30 dB Resolution: 0.1 dB Accuracy: +1 dB xt count (at 12 dB) Signal Frequency: 1 kHz Supplementai Characteristic 9.03 to 200 Vrms (SCOPE/DVM input) 0.15 to 15 Vims (AUDIO/DATA input) DIGITAL VOLTMETER 1 Signal Level: Ranges: 50 mV to 200 V ina 1-2-5 sequence Range (OC): 40 mV to 200 Vde (SCOPE/DVM input) (AC): 410 mV to 200 Vins {SCOPE/DVM input) 450 mV to 15 Vims (AUDIO/DATA input) $0 mV to 200 V (1-2-5 sequence) 3.5 digit Meter Ranges: Resolution: OSCILLOSCOPE Bandwidth (3 dB): 50 kHz Verticat Ranges: 10 mY to 200 V per division (1-2-5 sequence) Max Input Voltage: 200 Vpk Accuracy: 5% full scale Resolution: 1% full scale Coupling: DC, AC and GND Supplemental Characteristic Resolution 256 data points, 8 major divisions Horizontal Ranges: 100 jisec to 100 ms per division (1-2-5 sequence) Resolution: 1% full scale Accuracy: 1% full scale Supplemental Characteristic 500 data points, 10 major divisions 1 M&, unbalanced Resolution: impedance: 62Display: Log, 2 and 10 ¢B per division Center Frequency: 250 kHz to 999.9999 MHz ‘splay ‘9, 2 an per aivisi Vertical Resolution: 14B Supplemental Characteristic Range (Dynamic): 60 dB Tunable Range: 100 Hz to 999.9999 MHz . (characteristics below 250 kHz Bandwidth Switching are not specified) Error: <3 dB Resolution: 400 Hz Log Linearity: £2 dB (referenced to -40 dBm} Frequency Span £3 dB (<15°C, 235°C) Ranges: 1 kHz to 100 MHz per division in Input Attenuator: 0, 30 dB (Antenna Connector) a 1-2-5 sequence + zero span INPUT/OUTPUT CONNECTORS A : + fh Acouraay 5% of span wit RS-232 Connector Fronaoney Span Normal, Split Screen Operations Mode: Off, PC (Input/Output) Modes: Resolution Baud Rates: 400, 150, 300, 600, 1200, 2400, Scan Width Bandwidth 4800, 9600, 19200, 38400 4100 MHz 3 MHz Stop Bits: 1.2 bo Mae 3 Mae Parity: Odd, Even, None 10 MHz 3 MHz Handshake: None, Xon/Xoff, CTS/RTS 5 MHz 300 kHz 2 MHz 300 kHz MASTER OSCILLATOR 1 MHz 300 kHz 500 KHz 30 KHz TCXO 200 kHz 30 kHz Frequency: 10 MHz fee ane So nz Uncertainty: 40.1 PPM z 2 20 kHz 3 kHz Temperature Stability: £0.2 PPM (0°C to 50°C) 10 kHz 3 kHz Aging: +£0.5 PPM/year 5 kHz 3 kHz 2 kHz 300 Hz 1 kHz 300 Hz 0 KHz 30 kHz ARDC Input: 12 to 30 Vdc Power Consumption AC: 180 W maximum De: 150 W maximum Supplemental Characteristic Power Consumption {AC): 110 W typical (Dc): 90 W typical GENERAL CHARACTERISTICS ] Operating Temperatures 0° to 50°C 40.0 cm (15.75"} wide, 19.0'cm (7.5") high, 42.9 cm (16.875") deep (without bail handle and front panel cover) 44.0 cm (17.32") wide, 19.0 om (7.8") high, 83.7 em (24.125") deep (with bail handle and front panel cover) 17.3 kg (38.5 Ibs) (without options, lid, accessories} Dimensions: Weight: WHEN OPERATING THE EQUIPMENT IN THE NORMAL HORIZONTAL POSITION, MAINTAIN AT LEAST TWO INCHES (2FIVE CENTIMETERS) OF CLEARANCE BETWEEN THE EQUIPMENT SIDE WITH EXHAUST FAN AND OBJECTS OR WALLS. IF OPERATING IN A RACK, MAXIMUM AMBIENT TEMPERATURE MUST BE AT OR BELOW 40°C. OPTIONS ] 01 Internal Battery. Provides self-contained power. 02 0,01 PPM Oven Time Base. The oven time base replaces the standard TCXO and is recommended for customers maintaining 800/900 MHz systems. 30 kHz IF Filter, The 30 kHz filter is required when ordering Option 15. 04 #2 Variable Function Generator. The generator replaces the standard fixed 1 kHz generator. Generate Amplifier. An internal 26 dB amplifier for those requiring additional AF output level. 07 Data Generator/BER Meter. The Data Generator/Bit Error Rate Meter is available for testing digital characteristics of transceivers. 08 SSB Receive Filter. The SSB filter is available for customers requiring the capability to monitor SSB signals. 09 RCC Signaling. Provides MTS, IMTS and Tone Remote Control signaling. 0; 3 0! a 64cCcIR EURO repeaters and mobiles. pzye naret 18 AMPS Mobile Station Test. Auto and manual test Be Tone Bpevel facilities to verify proper operation of AMPS mobiles, ger ee transportables and portables. POCSAG 16 EDACS*. Provides test capability for EDACS repeaters 12 Tracking Generator, Tracking Generator and Spectrum and mobiles. Analyzer provide amplitude vs. frequency display when sweeping cavities, duplexors, ete. NOTES