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ELEKTR NIKA Frequency Control Modes OFET 91

Learn about the frequency control modes of OFET 91, including frequency setting with number keys, frequency modification with cursor keys, frequency tracking with sweep, receiver controlled by transmitter, frequency setting in carrier ± tone format, special transmitter tracking mode, end-to-end loss measurement, and group delay distortion measurement.

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ELEKTR NIKA Frequency Control Modes OFET 91

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  1. FREQUENCY CONTROL MODES OFET 91 Frequency Setting with Number Keys Frequency Modificationwith Cursor Keys Sweep (Fr receiver = Fr transmitter) One Fr. (Fr receiver = Fr transmitter) Fr receiver = Carrier ± Tone Fr receiver = Carrier ± Fr transmitter END to END Loss Measurement Group Delay Distortion Measurement To learn more click on note! ELEKTR NIKA

  2. Frequency Setting with Number Keys To set a new frequency use the NUMBER keys as usual. E.g. 3825 Hz Notice: don’t touch the cursor keys ELEKTR NIKA

  3. Frequency Modification with Cursor Keys Modification of frequency in 1Hz, 10 Hz 100Hz etcsteps. The frequency STEP can be selected with the HORIZONTAL cursor keys FREQU: 100.000 kHz FREQU: 100.000 kHz FREQU: 100.000 kHz FREQU: 100.000 kHz FREQU: 100.100 kHz FREQU: 100.200 kHz The FREQUENCY can be modified with the VERTICAL cursor keys Notice: don’t touch the number keys ELEKTR NIKA

  4. Frequency Tracking with Sweep Selectable ranges ELEKTR NIKA

  5. Receiver controlled by the Transmitter The TRANSMITTRER & RECEIVERmode is intended for fix frequency measurements. The test parametersofreceiver and transmitter can be set separately but the synchronic frequency control is also provided. If we select the Txfrequency setting mode the receiver automatically follows the change of transmitterfrequency. ( Fr receiver = Fr transmitter ) ELEKTR NIKA

  6. Receiver Frequency Setting in Carrier ± Tone Format Test instructions of FDM systems often specify the test frequency in format: Carrier ± Channel ( Tone) Frequency. ET 91 provides the separate setting of carrier and tone frequencies and so: No frequency calculation is required! Select mode Final display format Set carrier Set tone ELEKTR NIKA

  7. Special Transmitter Tracking Mode During the test of FDM equipment often required a special transmitter tracking when: ■ audio frequency test signal is applied to the input of tested channel and ■ the modulated high frequency signal is measured In that case: Receiver Frequency (Rx)= Carrier ± Transmitter Frequency (Tx) In special transmitter tracking mode of ET 91 two parameter can be set: ■ the frequency of transmitter between 200Hz and 4 kHz in 1 Hz steps and ■ the carrier between 1kHz and 2400kHz in 1kHz steps The test frequency of level meter is automatically set ADVANTAGES:No frequency calculation is required ! In case of test series only one frequency setting is required ! ELEKTR NIKA

  8. END to END Loss Measurements with MTTS MTTS METHOD: ■The transmitter generates 35 test tones ■The receiver measures the 35 test tones simultaneously ADVANTAGES: ■No synchronisation is necessary between the two instruments ■The measuring time is shorter than that of other methods ELEKTR NIKA

  9. Group Delay Distortion Measurement with MTTS ET 91 applies the multi tone test method described in Recommendation ITU-T O.81 Appendix I MTTS METHOD: The transmitter generates 36 test tones ■ Frequency range: 100 to 3600 Hz ■Frequency step: 100 Hz ■Level: -20 dBm / frequency The receiver measures the 36 test tones simultaneously ADVANTAGES: ■No synchronisation is necessary between the two instruments ■Group delay and signal level measurement at the same time ■The measuring time is shorter than that of other methods ELEKTR NIKA

  10. THANK YOU FOR YOUR ATTENTION!

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