Rohde & schwartzSMDU_249.3011_Data_sheet 电路图.pdf

L;:/!A .;)( ;!: llJ(ULI -i:! .; o=r_._._, o:l I HJIW 1.JW - Figure 1SMDU 249.3011.56test assembly for FM radiotelephonesin a single cabinet 249 310-2- RadioFans.CN 收音机爱 好者资料库 SMDU ApplicationModel Furtherinformation in data sheet AM/FMradiotelephones Radiotelephone model249.3011.06 AM radiotelephonesandRadiotelephone stereobroadcastreceiversmodel249.3011.09 (in combinationwithCB sets) AM/FMradiotelephones,Radiotelephone airborneVOR/ILSandand air-navigation249 311 communicationequipmentmodel249.3011.07 AirborneVOR/ILSandAir-navigation communicationequipmentmodel249.3011.08249 301 and249 311 Low-costsignalgeneratorStandard model249.3011.02249 301 General-purposesignalgeneratorUniversal model249.3011.04249 301 Allmodelsare suitedforuse as theinterferingsourcein two-sourcemeasurements Table1Themodelsin theSMDUsignal-generatorfamilyandtheirapplicationsin radioengineering .)I. Models SMDU02,04 and 08 are described in detail in separate data sheets. The main characteristics of these models are given in table 2. ModelModulationModulationOutputAutoranging modulation meter specially suited forgeneratorand AF voltmeter SMDU02-0.4 and 1 kHz1vno SMDU04Stereo broadcasting15Hz to 150kHz5 mV to 1 Vyes SMDU08Stereo broadcasting15Hz to 150kHz5 mV to 1 Vyes and VOR/ILS signals Table 2 Characteristics of general-purpose signal-generator models SMDU02,04 and 08 Options This option is fitted as standard equipment in the Radio- telephone Test Assemblies SMDU06, 07, 09 and 56. It protects the RF output of the signal generator against Figure 2 SMDU models 04 and 08W.externally applied power of up to 50W. All models of the SMDUcan be fitted with the following five mutually independent options. The options can be ordered together with the signal generator or added later as required. , - This option is fitted as standard equipment in the Radio- telephone Test Assembly SMDU 249.3011.56. Long-term frequency stability is improved to that of a synthesizer while the high spectral purity of afree-running oscillator is maintained. Operation is greatly simplified by thechannel-steppingfacilitywithswitch-selected steps of 12.5, 20, 25, 50, 100 or 150kHz and by the wide-ranoe, high-resolution electronic fine tunina. -3 -249 310 RadioFans.CN 收音机爱 好者资料库 SMDU VOR/ILSUNIT .SMDA-Z214.3115.02 Add-on units ModelSMDU249.3011.56 issuppliedasafully equipped RadiotelephoneTestAssembly.The remaining models can be equipped for radiotelephone and air-com- munication equipmenttesting by combining them with a number of add-on units. For special applications, such as antenna testing and sequential-tone meas- urements, further instrumentation is available (see pages7 and 15). 111111.POWER TEST ADAPTER 1111SMDU-Z2242.4012.52 This unit permits matched connection of the radio- telephone to the test assembly,further signal gener- ators (for multi-source measurements) and to an analyzer. It also permits switchover between receiver and transmitter measurements without reconnection of the cables. The power test adapter, which is stand- ard equipment in the SMDU56, is a particularly eco- nomic way to provide these essential functions. RadiotelephoneModes:Connector forConnector for connectorreceiver measurementsfrequencymeter,signal generator power/frequency/deviationdeviationmeterand analyzer measurementsthird signal generator e ,r,:.oS, . ,Ic t .,. = Powerindication rapid settling wide indicatedrange Ranges 0.3to30W Connectorfor analyzerand second signalgenerator Figure 3 The power test adapter for the SMDU (see also data sheet 242201) AM UNIT .SMDU-Z1 242.2010.53(60-Wmodel) 242.2010.52(30-Wmodel) The AM unit makes for even greater operating ease and provides the additional function of modulation- depth measurement.The AM unit is available in 30-W and 60-W models, and differs from the power test adapter through the additional features shown in figure 4. Also provided are recorder outputs for the carrier voltage and the modulation depth. In both cases a DC output voltage of 1V3%corresponds to full scale on the front-panel meter. Modulationdepth indication simultaneouswith Automaticor manualrange selection with AF outputof demodulated input signal c . -r:a.r:l 0 Automatic switchover of transmit/receive measurements Two time constantsModulation-depth forAMindicationranges of 40and 100% Figure 4 The AM unit for the SMDU (see also data sheet 242201) 249 310 The VOR/ILS unit is for use in all measurements on VOR/ILSreceivers according to the ARINGand RTCA recommendations (see data sheet 249311). VOR/ILSUNIT .SMDA-Z214.3115.10 This model of the VOR/ILS unit includes a decade DOM (difference in depth of modulation) switch. The switch can be set in steps of 0.001DDM. Figure 5 VOR/ILS unit with decade DOMstep switch Ine511iDOMn.,.!ODOM .,_,. .i .:oo;- - -., 877;it:o,r:r.,:;.Ili ,:!. ,:. :. : e_ . _.:.:!.: .:,JJ1: 11111tfl. -:. .l . -:11c_._. :A; - !I. . . - TEST ASSEMBLY FOR AIRBORNEVOR/ILS AND COMMUNICATIONEQUIPMENT The outstanding advantage of this test assembly for air-navigationreceivers is thebuilt-inmonitoring facility. The complete system for testing VOR/ILS receivers thus comprises an AF generator, an RF generator and a monitor. Other features of the test assembly are self-test and calibration facilitiesby means of which the accuracy of the modulation- depth, DOM-null and VOA-phase measurements can be checked and restored as necessary (see data sheet 249311). .,a 8n: .sc-v .<tL.lIXNIL<SlW.lfAClt:COO<.SllP:; w -.fi55Tu:.:.:)-r-r-. 00010 .2.:._ . liiiAgl- .,:.- ;- - - .) i .;=.-.: :i.;. . = .,. . - I- *ULUU.: - ; :7-,_ -. - D n . Ei 8 -._.-.,. .,.: . g.Fr. :fi1.: :j!I o to:5.!-, Figure 6 VOR/ILS test assembly -4- SMDU High-accuracy,cost-effectiveradiotelephone . testassembls Channel crosstalk in stereo modulation as a functionI Io100200soo400soo eoo100ooo soo1000MH of modulation frequency1 - Figure 9 Signal-to-noise ratio with 1-Hz measuring bandwidth for various carrier offsets as a function of carrier Figure 7 FM modulation distortion and crosstalk of SMDU09I Ifrequency Thisthird generation of radiotelephonetest assemblies is the result of many years experience in the field. The Radiotelephone Test Assembly SMDU is ideal for all measurements in development, test department, production and servicing. Its low price makes the SMDU an attractive solution in all such applications. The convenient operating controls and the provision ofsemi-automated testroutinesmake forgreat rationalization of the measurement process. Even in measurements involving a number of error sources is the overall accuracy of the result assured.Thus, for example, in the measurement of SINAD sensitivity according to the method of CEPT,the errors of level meter, deviation meter and voltmeter, range switch- over and SINAD filter are all taken into account. The worst-case error in making this measurement with the SMDU is less than 3 dB, less than half that of the test sets normally used. Since the AF voltmeter uses a true rms rectifier, as specified in the test method, no additional error is thereby introduced. Although it would be possible to manufacture cheaper test assemblies by not taking account of these meas- urement specifications, the use of such equipment, even for servicing purposes, would be of dubious value.Where required, the SMDU incorporates instru- ments of an accuracy found previously only in spe- cialized, separate units. The test assembly is already in use by many national authorities with responsibility forradio traffic.The SMDU 06, forexample, is registered with the Deutsche Bundespost under the number 27609415,and the AM Unit SMDU-Z1 under the number 276094155. COST EFFECTIVENESS The SMDU combines the necessary measurement % 3 -1.: -1 -1;sis;,. -Typ;calvalues _,.,.1 I I 0.5 0.3 0.1 0.05 I 100200 kHz f- FM modulation distortion measuredwith a distortion- free modulating signal of 15Hz to 53 kHz as a func- tion of frequency deviation accuracy with an attractive price. The test assembly makes use of many of the subassemblies of the signal-generator family of the same name, thereby gaining the advantage of advanced design techniques and permittinghigh-volume productionand auto- mated.testing. The SMDU is conceived in such a way as to permit the multiple use of many subassemblies and the cost-saving fulfilment of varying measurement requirements through the creation of different models of the basic signal generator. The possibility of later extension by the incorporation of options has also been foreseen fromthe design stage. Thus, for example, the SMDU09 is suitable for testing high- qualitystereo-broadcastreceiverscombinedwith Citizens Band radiotelephones for use in cars. WIDE FREQUENCY AND LEVEL RANGES The test assembly has a frequency range of 0.14 to 525MHz which may be extended to 1050MHz by the addition of option SMDU-B3or SMDU-B5.This range covers all present and planned radiotelephone bands as well as many other services, and is also adequate for broadband measurements. Figure 8 Level inaccuracy as a function of frequency - I 2 dB 1.5 Level range 0.1V to 0.5V EMF 1 - : +as-t-,r-,Typicalerror.,.,; -,_ 0.10.30.5 1351030 50 100300500 Hz The extremely wide range of the output-signal level (0.05V EMFto 2V EMF) covers all possible require- ments, from the testing of high-sensitivity receivers to overdriving, blocking and similar situations where a high voltage is necessary. The excellentlevel accuracy throughout the entire frequency range is illustrated in figure 8. HIGH SPECTRALPURITY The high spectral purity of the output signal allows 1 150 j Offet dBfrom earner100 kHz r- - :Offset._ g140 .1c!:!20.!Typ1calvaluas , I- - - J f-J<,. LlI.- . . . ,: _ -. -, I FREQUENCY METER Frequency switchover internal/externall -!II-:w Synchronizer on/off SYNCHRONIZER Locking range indication Digital display AF to UHFlw- .lI!I I I IJl.J. Electronic lftMl14 II!IIII1t.tJ!I!IIIJ RF GENERATOR Coarse tuning withIIIII111 111 pushbuttons and analog scale .L.L._YL-I!TI!J IXTIHMODUATION Automatic or manual range selection Operating mode Range indication Coarse/fine drive (continuously tunable over entire-. - range without reversal of direction) POWER METER Figure 11SMDU Radiotelephone Test Assembly with AM Unit SMDU-Z1 U,.w_ij MHz !XT. FRIQ. +HUBIDIV MUIR t.5 -1Gth U!lOmV JiriiHO 2:.Q-USMM VI!lOmV ,.,son 15 H1 - 3 Mlti U110MV HlOOpF MAXJV ,. lHltt:-: Indication 249 310- 8 - SMDU I l 4 DEVIATION METER INDICATION LevelAutomatic or manualSelection of TEST FILTER CCITT Harmonic distortion SINAD ratio MOOULATIONr: fM ioo DPt- lT ClHI ,lltHH it! lIC .;()Il111 lIlllUlG ;.i1V 11,11 .1,l:rd.11_/rJ,._ 1:11,1 .;!:.; .11 -10t,illGICICI-D-Ml tl i-I:.,i .:.-.!I-I I liIIRF OUTPUT ATTENUATOR with coarse/fine scale !II MOO.MOD. GEN. HF RF :etfl.:It-A.USOFF ons llODIDf PlM Time constants IndicationRange AM MODULATION-DEPTHMETER - 9 - 249 310 SMDU Test connectors SWEEPINGAF MEASUREMENTS Voltage distortion with/without CCITT filter Demodulated AF generator RF voltage from radiotelephone 249 310 Frequency MOOULATION-1I external;=1DEVIATION METER eAF output voltage ROHDE.<JH.)I I . 1 111 ,Receiver I .L_i i!i! iL_JiLoudspeakerI _,_,AF voltmeter)output IJ .I NotesI !;OPTIONSL_J *Standard equipment in Radio- telephone Test Assembly SMDU 249.3011.56 Only in AM Unit r:=- SMDU radiotelephonemodel Beat frequencymeasurement IBCD AF 249310 Freq. meter 15Hz- 30 MHz ator AF logic Autoranging Figure 13 Block diagram of the RT Test Assembly RF Input/outputI AFgenerator -12- SMDU Specifications Frequency without options.0.14to 525MHz with option.0.14to 1050MHz Reference crystal,internal or external.10MHz, aging 5X10-/month Resolutionof display0.14to 50MHz50 to 800MHz800to 1050MHz 1 or 10Hz10 or 100Hz0.1 or 1 kHz Tuning modes andFree-running With synchronizer1) frequency instability unsynchronized lockedwith fine tuning Channel spacingsnone12.5/20/25/50/100/150 kHz12.5/20/25/50/100/150kHz + 0, -1% Tuning rangeunlimitedsteps equal20 to 160kHz according to channel spacingto channel spacing Warmup time10min3h15min1 h15min1 h Measuring interval5 min10min10min1 h10min1 h Temperature changenonenone1=c1=c1=c1=c 0.14to 200MHz<3kHz< 1.5kHz < 100Hz 200to 525MHz< 4 kHz< 3 kHz< 5 X 10-a+ 10Hz 525to 1050MHz< 8 kHz< 6 kHz < 5 x10-7 Spectral purity Signal-to-noise ratio with 1 Hz measuring bandwidth approximately 140dB; see figure 9 on page 5. FrequencyHarmonicsSpurious suppressionSpurious frequency deviationSpurious depth MHzsuppressiondBHzof amplitude modulation (<1VEMF) 200MHzCCITTweightingCCIRweightingCCITTCCIR dBfrom carrierfrom carrier(0.3to 3 kHz)(20Hz to 15kHz)weightingweighting 0.14to 50 26 (typ. 30)90 90 (typ. 100) <7 35 (typ. 40) 110 110 <7 35 (typ. 40) 11090<10< 40 (typ. 20)< 10-4 26 (typ. 30) 11070<20 20 (typ. 26)100 20 (typ. 30)<20< 60 (typ. 30) Incidental AM for FM with fmod=1 kHz . 1 MHz) Incidental synchronous cpMfor 30%AM depth I 0.14to 20MHz I 20to 110MHz I 110to 525MHz Modulation index .M/fmod I < 0.02 (typ. 0.01) I < 0.1 (typ. 0.05) I < 0.2 (typ. 0.1) RF outputof signal generatorN female connector, adaptable4)(Dezifix A base) Output EMF or power.0.05tVto 2 V or -139 to +13 dBm Source impedance. 50 Q VSWRfor levels < 0.2V EMF< 1.2 (f < 525MHz); 525MHz) Output voltage error (total error) 0.4 to 525MHz . <1dB for 0.1 tVto 0.5V EMF remainder of range 20mV into 50 Q ConnectorBNC female Frequency meter(7-digit readout) Frequency rangeVoltage ranqe MaximumInputResolutionGate timeInput impedance 15Hz to 30 MHz10mV to 3 V10v1 or 10Hz1or0.1s10kQII20pF 20to 525MHz10mV to 3 V 10v10 or 100Hz1 or 0.1s50 Q 500to 1000MHz5)30 mV to 1 V3V10 or 100Hz2 or 0.2 s50Q Permissible noise voltage . 5 mVpp Data valid for direct signal input. When signal is fed via SMDU-Z1 or Z2 measurement range of power meter applies. 15mV above 470MHz. 1) With option2)With option 3) With option 4) With the aid of screw-in assemblies the user can easily adapt this SMDU-B1SMDU-B3SMDU-B5connector to other systems; see data sheet 902100. 5)With option SMDU-B4 -13-249310 SMDU Specifications AF generator and modulationvalues in brackets with synchronizer AF generatorAM1)FMcpM EMF<1V,fc=0.4to400MHz AF generator0.3/0.4/1/2.7/3/60.03to 10Oto 200.3 to 6 or modulation frequency in kHz0.03to 30 contin.0.1 to 20) Indication/frequencyresolutionanalog/1 Hz digital Output voltage/modulationrange1 mV to 5 V into 200QOto approx. 98loOto 10/100kHz3)0 to 100rad < 1500radM< 10/100kHz Harmonic distortion/modulation< 0.5lo(0.1to 1OkHz)<1.5%2)< 1lo < 1lo distortion Measurement range (indication)10mVto 10V (7ranges)10/30/100lo1/3/10/30/100kHz1/3/10/30/1oorad Error limits (2loof rdg +1.5lo (4loof rdg +1.5lo (5loof rdg +1.5loas FM+phase of fsd) above 3 mVof fsd)2)of fsd)response Phase response up to 3/6 kHz < 0.2 dBI<0.4 dB 1) Double tolerances in range 400to 525MHz. 2)For 30 Hz to 4 kHz, m < 80lo.3) Max. devia