Rohde & schwartzSMDU_249.3011_Vol.1_Manual 电路图.pdf

《Rohde & schwartzSMDU_249.3011_Vol.1_Manual 电路图.pdf》由会员分享，可在线阅读，更多相关《Rohde & schwartzSMDU_249.3011_Vol.1_Manual 电路图.pdf（154页珍藏版）》请在收音机爱好者资料库上搜索。

1、( DEL Fi5. 2-4 Fi. 4-1 Fi5. 4-2 Fi5. 4-;L Fiez.4-4 Fi5. 4-5 Fi. 4-6 Fi. 4-7 Fi. 1-1 Fi. 1-2 Fi5. 2-1 Fi-1 Fis;.2-2 to5-4 Fi. 5-5 to 5-13 Table 2-1 Removing and Opening the Subassemblies 148 CormterY7 148 OscillatorYl .149 Range Switch Yl0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149

2、 .AmplifierY2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 MixerOscillator Y6150 RF Attenuator Y4 Power Supply Y9 .150 151 151 . Modulation Unit Y8. 1.05-GHz Frequency Range-Extension SMDU-B3 and 1.05-GHz Frequency Doubler SMDU-B5 152 Doubler Y301.152 152 153 153 Bandpass Filters 0.5

3、- 1 GHz Y302 and Final Stage Y303 Incorporating Options into the SMDU Synchronizer SMDU-Bl. 1.05-GHz Frequency Range Extension SMDU-B3 and 1.05-GHz Frequency Doubler SMDU-B5 153 1-GHz Frequency Meter SMDU-B4 154 Modification of Synchronizer SMDU-Bl 154 Real power with mismatch23 Equivalent circuit d

4、iagram of a noise voltage source 24 Control circuits of amplifier Y2 74 Block diagram of AF processing circuit 86 Distortion meter with level control 90 Block diagram of control logic in modulation unit 92 SIMPIBX. mode. 95 DUPIBX. mode96 Relaymode98 Block diagram including all options Radiotelephon

5、e test assembly Controls RF levels Logic levels Inside views Contact occupation of socket BCD OUTPUTS/RECORDER Appendix R 35169 -9 ._:t ;,_. i ,. ,(i: 1,:-.-11 -.-. 2.Preparationfor Use and OperatingInstructions The valuesmentionedin thissectionare not guaranteed;onlythe specifica- tions givenin 1.3

6、 are binding. ( 2.1Legend for Fig. 2-1 The reference rrumbers to2refer to the control elements of the Synchro- nizer SMDU-Bl, which can be incorporated subsequently. FunctionRef.No.IEngraving 1 I 392-525784-1050 286-395572-790 196-290510-580 118-198 85-119 63.5-88 49-64.5 I I 0.14-50 2 Pushbuttons f

7、or selecting the frequency range. The red engraving of the upper three ranges (510 to 1050) is applicable if the 1.05-GHz Frequency Range Extension SMDU-B3 or the 1.05-GHz Frequency Doubler SMDU-B5 is incorporated and button 2 depressed.- Button for frequency doubling. Pressing this button doubles t

8、he upper three frequency ranges if the 1.05-GHz Frequency RangeEx.- tension SMDU-B3 or the 1.05-GHz Frequency Doubler SMDU-B5 is incorporated. Then the red engravings apply. Digital frequency readout. Operating mode and frequency range are selected by means of buttons11 Internal RF or AF or ex- tern

9、al frequencies applied to sockets45 , 46 ,47can be measured. Button10per- mits the resolution to be multipliedby ten. 4SYNCHRONButton for cutting in synchronization (no synchronization possible, when pushbutton 11EXT. 20 - 525 MHz is depressed). With synchronization on, lamp.2lights up. The state of

10、 synchronization is indicated on meter6 Pilot lamp lighting up with synchronization mode. 6CONTROL VOLT.Meter for indicating the state of synchroni- zation. 1 CH. SPACING 12.5/20/25/50/100/ 150 kHz Switch for selecting the spacing of the locked frequencies for synchronization. With synchronization m

11、ode (buttonand one of buttons 11, except for EXT. 20 - 525 MHz, pressed) and when turning the fine-tuning control 50, the signal generator frequency varies according to the selected spacing of the locked frequencies. R 35169 - 11 Ref.No.EngravingFunction () 8FINE IDNINGButton for cutting in fine tun

12、ing. Fine tuning of the synchronized signal generator frequency is made with rotary switch.2 . FREQ. FINEincoaxial rotary control for tuning of the synchronized signal-generator frequency; !button8must be depressed. Outer knob: 1 rotation=about 106of selected frequency spacing nner knob: 1 rotation=

13、about 0.1% of selected frequency spacing 10RESOL. xlOButton for multiplying the resolution of frequency readout2byten. 11 0.5 - 1 GHz 20 -525 MHzEXT. 15 Hz - 30 MHz :INT. Buttons for selecting the operating mode and the frequency range of frequency read- out2.Internal (INT.) or external (EXT.) frequ

14、encies canbemeasured, external sig- nals being fed into sockets,46or 47 Frequencies from 525 MHz to1GHz can be measured only if the 1-GHz Frequency MeterSMDU-B4is incorporated. 12MOD. INT. EXT. AM Blttons for cutting in the amplitude modu- lation and for selecting internal or extern- al AM. With ext

15、ernal AM, the signal is fed into socket51 With button23AM de- pressed, meter15indicates the modula- tion depth (adjusted with35 ) 13IPREEMPH. 6dB/OKT. 14IMOD. INT.FM EXT. Buttons for cutting in a preemphasis of 6dB/octave with FM. Blttons for cutting in the frequency modu- lation and for selecting i

16、nternal or ex- ternal FM. With external FM, the signal is fed into socket With button23FM depressed, the frequency deviation is indi- cated on meter1.2(adjustment with17 ). Meter for indicating the modulation depth, the frequency deviation, the phase devia- tion, the voltage at modulation-generator

17、output41 , the voltage at AF voltmeter in- put44-,-thedistortion or the SINAD ratio. The type of indication is selectedbymeans of buttons23 , the range of indication with switch22 lYpe and range of indica- tion are displayed on16 16Illuminated display of type of indication selected with buttons23(kH

18、z, rad,%,mV) and of indicating range selected with22 R 35169 - 12 Ref .No.EngravingFunction ( 18 20 10 100 kHz MOD.GENERATOR FIXEDVAR. 6 3 2.7 1 0.4 0.3 kHz FREQ. 10-30 3-10 1-3 0.3-1 0.1-0.3 0.03-0.1 kHz Push-pull rotary knob for adjusting a fre- quency deviation up to 10 kHz (in) or up to 100 kHz

19、(out). The frequency modulation is selected with If button23FM is de- pressed, the frequency deviation is indicated on meter1.2 The button permits adjustment of the phase deviation if13is pressed. Button for selecting the fixed frequencies set with19(released) or the ranges set with19Pressed) and tu

20、nable with.! . Buttons for selecting the fixed frequencies (left column) or the frequency ranges (right column) of the modulation generator depend- ing on the position of button18 Fine tuning of the modulation frequency is made with21 ,the frequency being indicated on roor-L. Scale for indicating th

21、e frequency of the internal modulation generator if18is pressed. The frequency rangeisselected with19 ,fine tuning of the frequency is made with21 With button AF INT.11 pressed, the digital frequency readoutL indicates the accurate modulation frequency if one of buttonsMOD.12or14is pressed. .C:- 21

22、22RANGE AUTO STOP MAN. Rotary knob for adjusting the frequency of the modulation generator if13is pressed. Ihefrequency range is selected with buttons 19and the frequency read on20 With button AF INT.Qpressed, the frequency of the modulation generator is indicated on the digital readoutL .The modula

23、tion ge- nerator is operative only if at least one of buttonsMOD.oris pressed. Range selector for meter15 .In the upper position the indicating range is selected automatically, in mid-position the momentary range is preserved and each time when setting the switch to the lower position switchover to

24、the next range is effected. The indicating range is displayed on1. R35169 - 13 Ref.No.EngravingFunction (. INDICATION FM fM 6dB/OKT. AM MOD. GEN. AFVOLIM. Buttons for selecting the type of indication of meter15 lhemeasuring unit (kHz, rad, %.mV) is displayed on16 24DEV.METER ON Button for switching

25、in the deviation meter. lhemode is selectedbymeans ofEJ.,28 The deviation is indicated on1.2with buttonFM23pressed. If the test signal present at46or47is unmodulated, the spurious deviation is indicated. + Button for indicating the negative or the positive deviation. 26LED indicating that the deviat

26、ion meter is ready for operation. It lights up only if the frequency of theRFsignal present at 46or47is within the operating range TOr pulling range with Duplex AFC) of the deviation meter and its level is sufficient. 28 RELAISON fup OFF flow Switch(3positions) for selecting the relay mode. Up: Uppe

27、r band (f) Centre: Relay opetion off Down: Lower band (f1 ) Relay mode OFF is iAfl!catedbythe LED. SIMPLEX DUPLEX-AFC Button for selecting the simplex or duplex mode in the case of deviation measurements. ZERO IRotary knob for compensation of the devia- tion amplitude in relay operation. CCITT FILTE

28、RButton for switching in the CCITT filter. This filter is switched in only if one of buttons FM2ortfM23together with 24or if button AF VOLlM.2is pressed. DIST. 1kHz Button for switching in the distortion meter. The distortion meter is switched in only if one of buttons FM23orfM23 together with24or i

29、f button AF VOLlM. is pressed. Meter15indicates the distortion,%appears on readout16 If no signal is present, LED UNCAL. lights up on.12 The CCITT filter30can be connected for distortion measurements. ZERO IIRotary knob for compensation of the devia- tion phase in relay operation. R 35169 - 14 .:) R

30、ef.No.EngravingFunction d.2 SINADButton for connecting the SINAD ratio meter. The notes given under L! also apply. The SINAD values 6/12/20 dB are markedby LEDs on meterl2 .They light up if the corresponding range is selected. 34LEVEL Push-pull rotary knob for adjusting the out- 0.5vput voltage of t

31、he modulation generator at 5Vsocket 41 When pushing the knob, output voltages down to 0.5 V and when pulling it, levels up to 5Vcan be adjustediWith button 23 MOD.GEN. depressed, the adjusted voltage i indicated on meter 15.The modulation generate is only operative if at least one of the butt MOD. 1

32、2 or 14 is depressed. % Rotary knob for adjusting the modulation depth. The amplitude modulation is selected with buttons.! With buttonE,2AM de- pressed, the modulation depth is indicated on meter15 36Crank-type knob for adjusting the RF output voltage. 21. Fine scale of the RF output attenuator; gr

33、aduated in 0.1-dB steps for adjusting and reading small level differences. oillil Power switch; pressedon. ,i.2 RFOutput socket for RF voltage (adaptable). 50QIheoutput level can be read on scale 40RFOFFIlluminated button for cutting off the RF voltage. The output impedance of output is not affected

34、. Due to the incorporated Overload Protection SMDU-B2, this button lights if an external voltage is fed into output 39 41MOD. GEN.Output socket of modulation generator. Ihe :100kQ EXT.FREQ. METER 15 Hz -30MHz UE10mV 10kQ40 pF MAX.3V Input socket for the AF voltmeter. If button _52AF VOLIM.is depress

35、ed, the external signal voltage is indicated on meter15 When button21.is pressed, the distortion is indicated: With buttonpressed, the SINAD ratio can be read. Input socket of frequency meter for external s!gnals from 15 Hz to30MHz. The frequency of the signal applied is indicated on digital readout

36、2if buttonl!EXT.15 Hz - 30MHz is depressed. Signals with an ampli- tude between 10 mV and3V can be measured. Voltages up to10V (alsoDCvoltage) do not damage the frequency meter. 46EXT.FREQ.+DEV. METER 20 - 525MHz UE)10 mV :50Q MAX.3V Input socket of frequency and deviation meter for external signals

37、 from20to525 MHz. The frequency of the signal applied is indicated on3if button11EXT.20 - 525MHz is depressed. The deviation is in- dicated onl2if buttons24and FM23 are pressed. Signals with an amplitude between 10 mV and 3V can be measured. If the minimum voltage is10 mV, the input is cut off; zero

38、 is in- dicated on3and 26 goes out. Voltages up to - iv v,a.io.,c,A.onotut.i.;:.,.,t:the testinput. R35169 - 16 _,. . - -,- ,. 525lliz, the non-doubled frequency is available at this outQut. Output socket for recording the test results. From the frequency meter the frequency is available inBCDcode;

39、from meter15the indication voltage is available; 1-V-full deflection. In addition, the internal operat- ing voltages are taken to this output (see Fig.2-2). Byconnecting points49and50,the resolu- tion of the digital frequency meter is in- creasedbythe factor of 10. R35169 - 18 ( Ref.No.EngravingFunc

40、tion 62115VT1,6D125VVoltageselectorwithpower fuse, and 220V T 0,8B235Vspare fuses on the inside of the cover plate. 63AC SUPPLYAC-supplyreceptaole. 2.2Preparationfor Use(For operatingcontrolssee Fig.2-1) 2.2.1AdJustingto the Local AC-supplyVoltageand SwitchingOn ( The SMDU complieswiththe safety reg

41、ulationsaccordingto VDE0411Class I. ClassI requiresinsulationof the circuitscarryingAC supply duringopera- tion. In addition,all exposedconductingelementsthat are likelyto be immediatelyalivein the case of a failure,must properlyand permanently be connectedwitheach other and withthe non-fusedearthed

42、conductor.The power plug shouldthereforebe insertedonly into an earthing-contacttype socket.Do not interruptthe non-fusedearthedconductorwhen usingextension lines. Connectthe terminal,ifany, permanentlyto a non-fusedearthedcon- ductor. The SMDU is factory-adjustedfor operationfrom220V AC supply.Bych

43、anging the positionof the voltageselector62the set can also be operatedfrom 115, 125or 235 V. Forthis purposeunscrewthe fuse from62and remove the coverplate. lurn the cover plate untilits markerline points to the desiredAC-supplyvoltageand put it on again. Screwin the fuse required for the selectedA

44、C-supplyvoltage: (_ T1.6D for115or125V To.8B for220or235V Connectionto the AC supplyis made via socketand the power cable supplied.Variationsof the AC-supplyvoltageup to:10%of the ratingsdo not affectthe performanceof the set as specifiedin section1.3.With heavierfluctuations,a transformeror AC-volt

45、agestabilizershould be connectedaheadof the signal generator. The set is switchedon withbutton Whenthe set is switchedon and the power fuse is intact,the digitaldisplay)_Ll.ght.sup. R35169 - 19 2.2.2Adjustingthe Zeroof the Meter If the SMDUis switchedoff,the pointerof meter1.2must be at scale zero.

46、Correct, if necessary, with the recessed screw below the meter. Before checking or adjusting the zero, wait a few minutes after the set has been switched off in order to avoid incompletely discharged capacitors causing a reidual deflection. The electrical zero is identical with the mechanical zero.

47、Meter6(only with incorporated Synchronizer SMDU-Bl) serves as indicator, its zero (centre) cannot be corrected. (,) 2.2Operating Instructions_(FnnpPing cnnols see Fig. 2-1) 2.2.1RF Oscillator 2.3.1.1Adjusting the Frequency Select the desired frequency with the corresponding buttonl .The frequency ra

48、nge is indicated beside the button and the associated frequency scale is arranged on the same level. The red engravings are applicable if the 1.05-GHz Frequency Range Extension SMDU-B.3or the 1.05-GHz Frequency Doubler SMDU-B5 is incorporated and buttongdepressed. Coarse adjustment of the frequency is made with tuning knob49and fine ad- justment with the outer tuning ring2Q .For highly accurate setting use the internal frequency meter. Depress buttonl!RF INT. and read the signal generator frequency on displayL ,in the frequency range 0.14 to 5C MHz wit