Frequency Converters and Associated Products. Sept 2012.pdf

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Visit us at www.work-microwave.deSatellite ConverterAutomatic Level Control (ALC)Filter AmplifierWORK Microwave delivers as stand-alone unit oroptionally within downconverters application specificALC Filter Amplifiers. The picture above shows astand-alone unit.The input of this unit can be connected to the IFoutput of the downconverter.The picture below shows a block diagram of theapplication specific ALC Filter Amplifier. The signal isbandpass filtered on the input as well as on theoutput. Both bandpass filters are identical.The pictures on the next page show typical amplitudefrequency responses of such filters. The overall filtercharacteristic of the complete unit results from aseries connection of the two identical filters, doublingall attenuation values in dB, which means that e.g. astop-band suppression of 50 dB for one filter results ina overall stop-band suppression for the complete unitof about 100 dB (for the same frequency point).In between these filters a variable gain stage allowsadjustment of the signal level. A small portion of theoutput signal level is coupled to an RMS detector.A digitally implemented control algorithm using amicroprocessor allows to select a specified outputlevel and keeps the output level constant, even if theinput signal varies within the allowed level range. Theoperational parameters of the ALC amplifier can beconfigured from the front panel processor as well asfrom remote. Also monitoring of the ALC amplifier ispossible from the front panel processor as well asfrom remote. Besides the main ALC output an ALCMonitor Output is available on the rear panel.ALC Input140 MHzBandpass140 MHzBandpassALC OutputALC Monitor140 MHzALCControllerADCFront PanelController522012-09-17
Satellite ConverterAutomatic Level Control (ALC) Filter AmplifierTypical Amplitude-Frequency Response ofone 140 MHz Bandpass Filter with 34 MHzBandwidth.Typical Amplitude-Frequency Response ofone 140 MHz Bandpass Filter with 54 MHzBandwidth.Typical Amplitude-Frequency Response ofone 140 MHz Bandpass Filter with 75 MHzBandwidth.Typical Amplitude-Frequency Response ofone 140 MHz Bandpass Filter with 110 MHzBandwidth.2012-09-17 53
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Frequency Converters and Associated Products. Sept 2012.pdf

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