Agilent Technologies 11970-90031 manual Signal Identification

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Operation

Operation

Using the Mixers with the E4407B Spectrum Analyzer (Option AYZ)

Signal Identification

The IF output of a harmonic mixer will contain a signal at the intermediate frequency of the analyzer whenever the harmonic frequency of the LO and the frequency of the RF differ by the intermediate frequency.

As a result, within a single harmonic band, a single input signal can produce multiple responses on the analyzer display, only one of which is valid (see Figure 2-3.). These responses come in pairs, where members of the valid response pair are separated by 642.8 MHz and either the right-most (for negative harmonics) or left-most (for positive harmonics) member of the pair is the correct response.

Figure 2-3.

Identification of valid responses is achieved by simply turning on the signal-identification feature. (instrument preset selects the Image Suppress signal identification mode.) Press Input/Output, Input Mixer, Signal Ident (On) and note that now only the valid response (35 GHz) remains.

Press Peak Search to place a marker on the remaining response. The signal-identification routine can introduce slight amplitude errors which is indicated by the message Signal Ident On, Amptd Uncal. Refer to Figure 2-4..

After identifying a signal of interest, press Signal Ident (Off) before making final amplitude measurements. Note that Image Suppress should only be used to identify the fundamental signal and not for accurate amplitude measurements.

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Chapter 2

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Contents Manufacturing Part Number OctoberCertification Limitation of Warranty Page Contents Service General Information Introduction Serial NumbersSeries Harmonic Mixers Mixer Connection Kit, Option Specifications Waveguide Connector Screws11970 Series Specifications LO Harmonic Number LO Input Frequency Range Model RF Frequency Range 11970 Supplemental Characteristics Specifications Operation Operating Precautions IntroductionGetting Started Mixer ConnectionsGetting Started Loading Data Viewing DataSet up the equipment Harmonic Mixer SetupAmplitude Calibration Manually Entering Conversion-Loss DataSignal Identification Chapter Spectrum Analyzer Amplitude Calibration Signal Identification AYZ Using the Mixers with the 856X Series Spectrum Analyzers External Mixer SetupSelect the Frequency Band External Mixer Frequency RangesSave the average conversion-loss value Select the band of interestSignal Identification 10 Store and correct for conversion lossIdentify signals with the frequency-shift method 11 Signal Responses Produced by a 50 GHz Signal in U Band12 Response for Invalid Signals Identify signals in wide frequency spans 14 SIG ID AT MKR Performed on an Image Signal15 SIG ID AT MKR Performed on a True Signal Using the Mixers with MMS Analyzers Preliminary OperationEquipment Connection Operation Band SelectionAmplitude Calibration for a Single Frequency External Mixing Bands and Associated Mixing Harmonics Band Harmonic Number N Frequency Range GHzSets which active input port will be selected when the Instr Frequency Ranges and Corresponding Harmonic Numbers Conversion Loss Versus Frequency Correction For further information, consult the Agilent 70900B Using the Mixers with the 8566B Spectrum Analyzer 17External Mixer ConnectionProcedure Amplitude CalibrationSignal Identification 19 Sample Mixer Calibration Table Performance Tests Test Record Performance Test Procedures DescriptionRecommended Test Equipment for 11907K Recommended Test Equipment for 11970A Recommended Test Equipment for 11970Q Recommended Test Equipment for 11970U Recommended Test Equipment for Recommended Test Equipment for 11970W Specifications Conversion Loss and Frequency ResponseDescription 11970V 50.0 GHz 11970W 75.0 GHz For 11970V or W Then press Center Frequency Conversion Loss and Frequency Response Conversion Loss and Frequency Response Performance Test Setups 1 Performance Test Setups 2 Conversion Loss and Frequency Response Test Record Conversion Loss and Frequency Response Test Record Specification Average Noise Level TestAverage Noise Level Test For 11970V or W Average Noise Level Test Average Noise Test Record Average Noise LevelService Maintenance RepairsReplaceable Parts Circuit Description11970 Series Mixer Schematic Diagram Accessories and Replaceable Parts Part Number DescriptionAgilent Technologies Sales and Service Offices European Field OperationsMaintenance