R&S FSQ Signal Analyzer - Rohde & Schwarz

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R&S FSQ Instrument Functions 6. Level correction with average value LO/IF ports for external mixers - Option R&S FSU-B21 If an average value is to be taken into account instead of the frequency-dependent level correction, enter the following parameters for the selected band in the SELECT BAND table: ➢ Enter the table with [ FREQUENCY : EXTERNAL MIXER : SELECT BAND} dB ]: ➢ Enter the average of the conversion loss into the field AVG CONV LOSS: {conversion loss} dB ] ➢ Enter the type of mixer (in this example 2-port mixer) into the field PORTS. ➢ Enter the permissible harmonic (in this example even, since a double-diode mixer is used) into the field EVEN/ODD HARMONICS: By pressing ENTER a list box will be opened to select the permissible harmonic. The entered average value is taken into account for the spectrum display irrespective of the frequency. The precision that can be obtained depends on the frequency response of the mixer. With this type of level correction measurements can be easily performed at single frequencies. 7. Taking into account the cable loss in the IF path On performing level correction, the conversion loss of the mixer and also the insertion loss a0 of the cable used to tap off the IF signal are to be taken into account. This additional loss is frequency-dependent. ➢ Determine the insertion of the cable at the intermediate frequency fIF = 404.4 MHz. ➢ For level correction with average value, add the cable insertion loss to the average conversion loss. ➢ For frequency-dependent level correction, increase every reference value by the insertion loss to the same extent. ➢ For this the cable loss can be entered via a transducer table. Such a table should only contain two reference values (band start and end) for which a0 is specified. 8. Functions for signal identification The spectrum represented in Fig. 4.41 contains the input signal and also a large number of unwanted mixer products. Two functions are provided by the R&S FSQ to identify real input signals. The implemented methods are described in section “Signal Identification” on page 4.290. The AUTO ID function is used in this example. ➢ Activate the function AUTO ID with [ FREQUENCY : EXTERNAL MIXER : SIGNAL ID : AUTO ID ] . To obtain a display with the correct level when using AUTO ID, the tolerance limit taken as a basis for the use of AUTO ID is to be adapted to the mixer (see explanations on the AUTO ID function and “Remarks Concerning Signal Identification with AUTO ID” on page 4.292). The tolerance limit has been set to 5 dB in this example. 4.300 Operating Manual 1313.9681.12 - 01
R&S FSQ Instrument Functions 1 AP CLRWR LO/IF ports for external mixers - Option R&S FSU-B21 ➢ Adapt the tolerance limit with [ FREQUENCY : EXTERNAL MIXER : SIGNAL ID : AUTO ID THRESHOLD : {tolerance limit} dB ]. The trace shown in Fig. 4.42 is obtained in which unwanted mixer products are blanked out. Ref -20 dBm -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 RBW 3 MHz * VBW 1 MHz SWT 50 ms Marker 1 [T1 ] -35.08 dBm 58.000000000 GHz Center 56 GHz 800 MHz/ Span 8 GHz Fig. 4.42 Output spectrum of the multiplier recorded with an external mixer and AUTO ID Operating Manual 1313.9681.12 - 01 4.301 1 A EXT
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R&S ® FSQ Signal Analyzer Operatin
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