1. Reference frequency 10MHz Plate: Y6 Place: SMFP lower surface, under the large sheet metal cover Y6 is a putting in map, on huckepack in temperature-controlled 10MHz-Oszillator (in former times an option; in the meantime standard) sits. 10MHz-Referenz The 10MHz-Referenz is adjusted by C53 in the frequency. 80MHz-PLL From this 10MHz become still further frequencies in Y6 derived; 1MHz, 80MHz, 40MHz. In addition a 80MHz-VCO becomes through a PLL (4046) with the highly exact 10MHz synchronizes. This PLL is adjusted, by one L2 (Resonant circuit inductance) in such a way it adjusts that itself after something Break-in period the PLL Abstimmspannung at MP1 exactly on -8,0V settles down. Parameter: everything completely wurscht; only - Break-in period of 30min. ensure - Modulation switch off ADJUSTED VALUES f (target) = _________________ MHz f (is) = __________________ MHz U (MP1) = _________________ V DC Result: ok /nok Measure best the output frequency with a frequency counter, is tied up at a rubidium frequency standard. 2. FM modulation stroke (TX) Plate: Y6 Place: SMFP lower surface, under the large sheet metal cover The FM modulation transmission stroke becomes likewise on the plate Y6 adjusted; however in three steps: 1. Minimum stop distortion factor (R7) 2. Adjust FM transmission stroke with f=500MHz (R9) 3. Adjust FM transmission stroke with f=460MHz (R12) The frequency modulation is seen technical by the 80MHz Oscillator on Y6 produces. This becomes directly of two Varactor diodes in the frequency affects; indeed Varactor diode GL1 - > PLL binding to the 10MHz-Referenz Varactor diode GL2 - > for production FM modulation. Thus a natural lower by the way results Critical frequency for the FM modulation: with deep NF-frequencies the PLL regulates the modulation!. 1. DISTORTION FACTOR minimize Over as clean a FM modulation - and thus as possible one to receive, one gives the GL2 one to small distortion factor Pre-loading for the Ruhelage.* The alignment for a minimum transmission FM stroke distortion factor one makes with R7. It results of approx. 0.18% rattle/clink reached. Parameter: f=390MHz FM modulation, externally, 1Veff@1kHz NF-frequency feed Modulation stroke: 75kHz ADJUSTED VALUES Klirr= _________________ % Result: ok /nok *Das naturally also something affects the quiescent frequency of the 80MHz-VCOs, why after the distortion factor attitude the 80MHz-PLL possibly must be after-resembled (description see above; L2 in such a way adjust that -8,0V at MP1). 2. FM transmitter stroke with f=500MHz Plate: Y6 Place: SMFP lower surface, under the large sheet metal cover To the adjustment of the correct modulation stroke there are two Alignment places. That is because of the fact that the voltage divider forwards the modulation diode GL2 in a part over a transistor T4 to be bridged and thus made ineffective can. That happened e.g. with the generator frequency of f=500MHz. The FM stroke alignment with f=500MHz takes place with R9. Parameter: f=500MHz FM modulation, externally, 2Veff@1kHz NF-frequency feed Modulation stroke: 100kHz ADJUSTED VALUES Stroke (target) = ___100_________ kHz Stroke (is) = ________________ kHz Result: ok /nok 3. FM transmitter stroke with f=460MHz The transistor T4 closes now and thus becomes R12 effectively. That Alignment thus also with f=460MHz would drive through. The FM stroke alignment with f=460MHz takes place with R12. Parameter: f=460MHz FM modulation, externally, 2Veff@1kHz NF-frequency feed Modulation stroke: 100kHz ADJUSTED VALUES Stroke (target) = ___100_________ kHz Stroke (is) = ________________ kHz Result: ok /nok NOTE: With f=500MHz Pin11a, b a 80MHz-Signal is uncoupled. Transistor T4 leads and the 1fache FM modulation stroke is used. With f=460MHz Pin11a, b however only a 40MHz-Signal leads. Thus the 2fache modulation stroke must be produced, damit's at the end again is correct! T4 becomes closed thereby and it can more NF the varactor diode GL2 modulieren.=> larger stroke 3. FM demodulator (RX) Plate: Y32 Place: SMFP top side, freely accessible The FM demodulator sits on the mixer plate and works on a ZF of 200kHz. The manual strikes to the calibration forwards, a modulated HF-Sendesignal > 100mW with exact defined FM stroke to use (however who has that already?). I suggest another procedure: Direct feeding of the 200kHz ZF by digital Function table with computationally more produced Frequency modulation (e.g. HP8904A, very very exactly!); into that Demodulator via MP9 (caution: Error in the R& S-manual, there became the name „“assign MP9 doubly!) Parameter: Calibration tone generator (e.g. HP8904A): Carrier frequency f=200kHz FM-Hub= 5kHz NF-Frequenz= 1kHz => Amplitude (for instance 200mVs are enough loosely out) make so large, that at Pin7 von B4 of clean TTL levels appears => Feed into MP9 Technology: Before L22 at a side must be however unfortunately unsoldered, thus one the 200kHz-Schwingung non-reactively into those Circuit over MP9 launching can. Importantly: the stroke measurer at the SMFP2-Bedienfeld switch on, thereby Line a11 on High put and thus the stroke measurer only one activates. Alignment: Digital voltmeter to MP14 attach (exit of the FM Demodulator; attainable directly at potentiometer R51; the MP14 gibt' s unfortunately not on the plate!). It must be measurable the following peak voltage US: with 20kHz FM stroke: accurately 5VsSpitzenwert. (=3,536Veff) In accordance with result: U MP14 [Vs] = 0.25 ⋅ modulation stroke [kHz] Alignment through R67: Offset Alignment with ∆f = 0kHz R51: Reinforcement Alignment with ∆f = 20kHz R67: Offset R51: Reinforcement Alignment with ∆f = 0kHz Alignment with ∆f = 20kHz ADJUSTED VALUES U (0kHz) target = ____0_______ V U (0kHz) is = _____________ V U (20kHz) target = ____3,536____Veff U (20kHz) is = ______________Veff Result: ok /nok Note: R67 reacts very sensitively! That is normal. 4. NF-electric rectifier (on Y37 „DC amplifiers “) Plate: Y37 Place: SMFP top side, freely accessible On the DC amplifier among other things the rms measurer, that sits to be adjusted must. In addition one feeds an external Sine signal and resembles the rms electric rectifier (AD536) and following DC amplifier (LF355) off. 1. Offset alignment AD536 NF-entrance of the rms electric rectifier on mass bridge (Minus-Seite of C16 and/or C14 = pin a4 at the contact strip). Best one solders to it a small short circuiting bridge between C16 and mass (e.g. R49). Afterwards please equal the building group Y35 " NF-Verstärker" do not take out, thus a4 for the next steps is short circuit (against a short-circuit feeds itself it in such a way badly…; -) Then digital voltmeters at MP6 (=Ausgang AD536, pin 6) and DC measure. With R52 the possibly existing DC voltage offset at MP6 too Zero crank. ADJUSTED VALUES U (MP6) being ___0_________ V DC U (MP6) Ist= ______________ V DC Result: ok /nok 2. Offset alignment LF355 Digital voltmeters at MP7 wedge and with R51 likewise up Zero adjust. ADJUSTED VALUES U (MP7) being ___0_________ V DC U (MP7) Ist= ______________ V DC Result: ok /nok 3. Amplification factor LF355 a) Now the short-circuit to entrance of the Rms electric rectifier waive and instead directly in a4 a NF-signal of 0,5Vs (= 353,6mVeff) feed (f=1kHz). Because of load by input impedance at the HP8903A at the best 410mV Amplitude stop, then one reaches the 353,6mVeff rather exactly (check!). b) With DC voltmeter at MP7 continue to survey and by means of R53 adjust accurately 1,0VDC. c) On 5,0Vs (3.536 Veff) and clean increase the NF-signal +10,0VDC at MP7 confirm. ADJUSTED VALUES Feed 0,5Vs U (MP7) being ___1,0_______ V DC U (MP7) Ist= ______________ V DC Feed 5Vs U (MP7) being ___10,0_______ V DC U (MP7) Ist= ______________ V DC Result: ok /nok The manual suggests taking if necessary R52 to assistance around those to adjust both alignment tensions correctly. Thus cranks one however the DC offset of the AD536. Because of that quite good Synchronität of the attainable values (e.g. measured: SMFP2 polarad: 0,998VDC <-> 10,023VDC SMFP2 R& S: 0,9984VDC <-> 10,003VDC) do not hold I however for necessary! REFERENCE The NF-Effektivwertgleichrichter becomes for many purposes used; e.g. for the announcement of the FM stroke (- > FM stroke measurer RX), NF-voltmeters or distortion factor measurers. Therefore is in clean alignment here very importantly. 5. A/D transducer (Y22) Plate: Y22 Place: SMFP top side, freely accessible The correct alignment of a/D transducer is extremely important, because it for the most diverse tasks is used (Stroke measurers, distortion factor measurers, NF-voltmeters, DC tension and ammeter, etc.….). Unfortunately the manual refers to another diagram, which is not present me unfortunately. But the concept seems to be like that: Technology: Y22 consists of two circuit parts. First is a NF Filter (pre-emphasis), which makes a PM from FM. The second part is more interesting: it consists of two adjustable DC amplifiers (once 20dB, once 10/20dB switchable) and a AD-transducer. The DC amplifiers leave itself only in their offset, however not in their reinforcement adjust. The AD-transducer stands a voltage range of 0,00..10, 23V. A bit corresponds thereby to 10mV. IMPORTANTLY: ask with all following measurements: GND = BU371 1. Offset alignment B22 (first DC-Amp uA741) Manual says: Preamplifiers on 40dB program: b9, 13a and 13b on TTL 1 put!) = B21 pin 3, 5, 11 BR2 bridges on mass in such a way changes BR2 b11 to GND Circuit and DC voltmeters at MP3 wedge. Adjust V with R32 on zero. I did not program simply nothing at all and the alignment " directly so" made. Goes also. ADJUSTED VALUES U (MP3) being ___0_________ V DC U (MP3) Ist= ______________ V DC Result: ok /nok 2. Offset alignment B23 (second DC-Amp uA741) BR2 let so put open and additionally BR3 (with it the entrance is interrupted to the ADC). Then DC voltmeters on MP4 wedge and with R39 on zero V adjust. ADJUSTED VALUES U (MP4) being ___0_________ V DC U (MP4) Ist= ______________ V DC Result: ok /nok IMPORTANTLY: It can be that the values with the alignment cyclically strongly vary! Then ask all measuring functions (e.g. the internal DC voltmeters) switch off, so that the ADC does not have to work! 3. Offset alignment B6 (AD-transducer) BR2 again back into the starting position, BR3 now on mass put. The AD-transducer to changing bring. The manual suggests, line a19 pulling (each HIGH impulse at Pin21 causes a AD-transformation) in addition, it goes many more simply: Equipment switch on and simply the external DC voltmeter activate. : -) The entrances of the DVMs short circuit. Now the data outputs (Pin3..12) monitors (oscilloscope). Guarantee that Pin3..11 all stand on TTL 0. Then R50 in such a way adjust that Pin12 (=LSB) ignores straight from TTL 1 on TTL 0. ADJUSTED VALUES U (Pin12) being _HIGH-> LOW_ TTL U (Pin12) Ist= ____________ TTL Result: ok /nok 4. Reinforcement alignment (AD-transducer) Now the R& tells; S-manual total nonsense. Allegedly one is to feed 10,22V DC into BR3 accurately and with R46 so adjust that Pin3..11 all stand for pin 12 on TTL 1 and (=LSB) on TTL 0 stands. One can make that and is dreadfully " besides kalibrieren" , because then this kind of the calibration those Inaccuracies of the upstream (and in the reinforcement not alignmentable; -) DC amplifier courses does not consider. Thus we make it many simpler for us (and better): a) All Jumperpositionen again in default position (BR2, BR3). b) With a DC-Kalibrator 10,000VDC into the sockets for that internal DC voltmeters feed (SMFP2-Frontplatte). c) The internal DC voltmeter activate and the measured value in SMFP2-Display read off. d) Adjust in such a way with R46 that accurately " 10,0V DC" in the display stands. e) Likewise try out with other voltage levels. Gggfs. with R46 after-same. E.g. 9.00 VDC are worthwhile (there one has a place more indicator dissolution). ADJUSTED VALUES Feed with DC-Kalibrator (e.g. Fluke 341A) U (in) being _____30____ VDC ______10_________ VDC U (display) Ist= _______ VDC _________________ VDC U (in) being _____9_____ VDC ______1__________ VDC U (display) Ist= _______ VDC _________________ VDC U (in) being _____100m__ VDC ______50m________ VDC U (display) Ist= _______ VDC _________________ VDC U (in) being _____10m___ VDC ______0__________ VDC U (display) Ist= _______ VDC _________________ VDC Feed with AC-Kalibrator (e.g. if necessary HP8903A) U (in) being _____6_____ VAC ______1__________ VAC U (display) Ist= _______ VAC _________________ VAC U (in) being _____100m__ VAC ______10m________ VAC U (display) Ist= _______ VAC _________________ VAC U (in) being _____1m____ VAC U (display) Ist= _______ VAC Result: ok /nok 6. Distortion factor measurer Plate: Y36 Place: SMFP top side, freely accessible On the much-saying plate Y36 " Filter" the two pole filters for 1kHz and 300Hz measuring frequency are developed. Function mode: The pole filter consists of three following absorber circuits for 1kHz-Zweig: 300Hz-Zweig: 1000Hz 300Hz 1010Hz 303Hz 990Hz 297Hz The change-over takes place via a heap of transistors from Type J111, those with 0V gate tension for instance 20..25Ohm resistance between drain and SOURCE to measure leave. As soon as it with -15V at the gate to be headed for, they close. Thus one scolded between the two different pole frequencies (1kHz/300Hz) over. All branches are to be adjusted successively. One makes that as follows: Alignment: a) The description of the R& S-manual completely forgotten (there the balance points are not even correct). b) Oscilloscope with probe to right side of the resistance R113 attach. c) At the SMFP the distortion factor measurer with 1kHz and/or 300Hz activate. d) With a HP8904 now signal of different frequencies with U = 5Veff into the socket " AC-Voltmeter" feed: Alignment • 1000Hz-Polfilter Potentiometer R67, R68 • 1010Hz-Polfilter Potentiometer R97 • 990Hz-Polfilter* Potentiometer R117 • 300Hz-Polfilter Potentiometer R72, R73 • 303Hz-Polfilter Potentiometer R96 • 297Hz-Polfilter* Potentiometer R116 Adjust in each case at the Oszi to minimum. *WICHTIG: with the last pole filter the alignment goes through Pick-up at R113 not (to large load by probe). From there here as Ablgeichkontrolle the distortion factor measurer announcement of the SMFP' s use! There is distortion factor announcements with f=297Hz and/or 990Hz of 0.0% attainable! ADJUSTED VALUES kmin (1kHz) being _0,0__ % (300Hz): ___0.0____% kmin (1kHz) Ist= _______ % (300Hz): __________% Result: ok /nok FM stroke measurer Circuit diagram of the signal process Y36 NF Filter Y32 Y35 Y37 Y22 NF DC AD HF Mixer Amplifier amplifier transducer announcement of Display 7.HF-Leistungsmesser The alignment of the HF cable measurer requires according to manual special HF-Leistungskalibrierquellen, those naturally none Humans have. With a well calibrated URV4 with 10V-/50Ohm Passage measuring head goes in addition. The alignment of the wattmeter takes place on the plate „Y37 DC amplifier “. There the two signals of the HF lie Dummyloads on (first diode: DC signal, proportionally to HF-level is; second diode: serves only for the Temperaturkompen sation for the first diode!). Alignment SMFP on power measurement scolded, but still nothing feed. 1. Offset alignment R23 digital voltmeter at Pin6 von B4 wedge (if necessary soldering on at R34!). With R23 the DC offset on 0V (0,1mV, with difficulty attainable, there Announcement somewhat wackelt) adjust. ADJUSTED VALUES U at B4/Pin6 being _0,0__ V IS: _________ Result: ok /nok 2. Offset alignment R32 now digital voltmeters at Pin6 von B5 wedge (i.e. at MP8). Now with R32 the DC offset on 0V (+/- 0,1mV, with difficulty attainable, since announcement somewhat wackelt) adjust. ADJUSTED VALUES U at MP8 being _0,0__ V IS: _________ Result: ok /nok 3. Reinforcement alignment R70 In order to calibrate the correct announcement, now R70 becomes in such a way rotated that the announcement in the SMFP with the fed Achievement agrees. Manufacture in addition the following measurement setup: SMFP2 HF in URV 4 URV4 measuring head HF-achievement with 10V-Messkopf: max 2W HF! 2m- Radio With the 2m-Funkgerät on small transmitting power for instance 2W HF feed. With directly on the SMFP screwed on the n Measure passage measuring head the fed HF-tension (URV4). The up-to-date fed achievement is: 2 U gemessenURV 4 PSoll (HF) = 50Ohm Now with R70 it calibrates the SMFP in such a way that the correct HF Achievement is indicated. ADJUSTED VALUES P HF in= ______ W Indicate SMFP: _________ W Result: ok /nok DC voltage at MP8 is by the way the HF-tension how follows proportionally: U DCanMP8 = 0.128 ⋅ U HF (URV 4) HF-wattmeter Circuit diagram of the signal process Overload Y45 Y47 Y37 Detector HF HF DC HF Step attenuator Distributor Verstärkerr to the AD of Transducer Test specimen Y22, of there to the announcement 20dB makes absorption,