COMPARISON IN FREQUENCY AND TIME DOMAIN OF AM AND FM MODULATED CARRIERS WITH SPECTRUM ANALYZER AND OSCILLOSCOPE

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How to fix a Delta Meccanica Coaxial switch

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In questo video le operazioni da eseguire per revisionare questo commutatore coassiale. I problemi principali possono essere causati da saldature fredde, da ossido sui pin della db25 e dal relè a bordo della scheda elettronica che risulta bloccato. Vedremo come smontare e rimontare il dispositivo e come eseguire un test di corretto funzionamento. Buona visione.
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HOW TO REPAIR THE LNB POWER SUPPLY ON THE SAT RECEIVERS PROFLINE TRSrm

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  HOW TO REPAIR THE LNB POWER SUPPLY   ON THE SAT RECEIVERS PROFLINE TRSrm AT FIRST WE HAVE TO TELL THAT YOU THAT IF YOU HAVE THIS KIND OF FAILURE 99% OF THE TIME , DEPENDS FROM THE BAD WIRING OF THE EQUIPOTENTIAL GROUND   SYSTEM . THIS MEANS THAT BEFORE CHANGING THE RECEIVER , YOU HAVE TO CHECK TO HAVE THE GROUNDING KIT ON THE SAT INPUT CABLE POSSIBLY BEFORE COMING INTO THE SITE , CONNECTED TO A GOOD COMMON EQUIPOTENTIAL GROUND POINT AND THE CASE OF THE RECEIVER ALSO CONNECTED WITH HIS GROUNDING SCREW TO THE SAME POINT OR AT LEAST TO THE COMMON GRUNDING POINT OF THE RACK THAT HAS THEN TO BE CONNECTED TO THE GOOD COMMON EQUIPOTENTIAL GROUND POINT . OF COURSE ALSO THE DISH AND THE LNB HAS TO FOLLOW THE SAME PRINCIPLES . IF NOT , YOU WILL CONTINUE TO DESTROY THE RECEIVER WITH LIGHTNINGS AND YOU ARE LIABLE FOR THIS DAMAGE . …………………………………………………………………………………………………………… The Profline TRSrm receivers are the most common SAT receivers we used all around .There are two types : A)    
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WHY USE THE ONE PORT RETURN LOSS MEASUREMENT INSTEAD OF THE TWO PORT TRANSMISSION LOSS MEASUREMENT

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How to tune a Coaxial Filter     In Fig.1 is shown the connection between Spectrum Analyzer-Rhotector (VSWR Bridge ) and a Coaxial Filter:                                                             Fig. 1. Connections between the instruments.   With this kind of connection you can measure the Return Loss or the Standing Wave Ratio of the coaxial filter at port F (shown in Fig. 1), Table 1 reports the relationship between the R.L and the VSWR. Table 1. Return Loss and SWR.     The Coaxial Filter is tuned by rotating the four knobs named Lin, Lacc1, Lacc2 and Lout, as in Fig 2. Delta Meccanica provides a graduation and a table for  the first position where is better to start the tuning. Fig. 2. Tuning Kobs. Delta Meccanica provides a graduation and a table for  the first position where is better to start the tuning. Table 1 shows the settings on two commonly used models of Delta Meccanica Coaxial Filters.                                                            
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