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Megasat HD800 original Software

Neue RAPS Senderliste Astra 19,2, Hotbird, Türksat vom 11.1.2010

This is circuit 13.8V, 40A Switching Power Supply,It is high current power supply switching regulator.And Nice Circuit for power user. This article was originally published (in a slightly modified form) in the QST magazine, December 1998 and January 1999, and in the Radio Amateur's Handbook, 1999. Visit the American Radio Relay League for information on these publications, and a world of ham radio related things! Design decisions There are several different topologies for switchers in common use, and the first decision a designer must take is which of them to consider. Among the factors affecting the decision are the power level, the number of outputs needed, the range of input voltage to be accepted, the desired tradeoff between complexity, quality and cost, and many more. For this power supply I decided to use the half bridge forward converter design. This topology connects the power transformer to a bridge formed by two power transistors and two capacitors. It is reasonably simple, puts relatively low stress on the power transistors, and makes efficient use of the transformer's magnetic capabilities.The second basic decision is which switching frequency to use. The present trend is to use ever higher frequencies. But by doing so it becomes more difficult to filter out the RF noise inevitably generated by the switching. So I decided to stay at a low switching frequency of only 25 kHz for the full cycle, which due to the frequency doubling effect of the rectifiers results in 50 kHz on the output filter. For the main switching elements, bipolar transistors or MOSFETs can be used. Bipolars have lower conduction losses, while MOSFETs switch faster. As in this design I wanted to keep the RF noise at an absolute minimum, very fast switching was not desired, so I used bipolar transistors. But these tend to become too slow if the driving is heavier than necessary. So, if the transistors have to switch at varying current levels, the drive to them must also be varied. This is called proportional driving, and is used in this project. The half bridge converter is best controlled by pulse width modulation. There are several ICs available for this exact purpose. I chose the 3524, which is very simple to use and easy to find. Any 3524 will do the job. It can be an LM3524, SG3524, etc. This basically ends the big decisions. From now on, designing the circuit is a matter of calculating proper values for everything.

Oltre al problema dell custom ID troviamo anche quello che alcuni dek non sono del tutto compatibili per problemi di telecomando, di audio o di tuner (ad esempio Digital M50 riguardo al telecomando). Prenderemo quindi in considerazione i seguenti "pseudo cloni" che differiscono oltre che per il custom ID anche per il tuner e nella fattispecie parliamo di: 31001-01020 = Satycon ALI FTA 31001-01024 = Stark TEC 4000 FTA Analizzando la stringa I2CTuner vediamo la differenza: 0C0000000D00000000000000001200B8 (tyran/smart) 0D0000000C00000000000000001200B8 (satycon/Stark tec) Apriamo il fw, ad esempio SATYCON_ALIFTA_V10.5.abs precedentemente scaricato, con l'alifixer e selezioniamo l'opzione edition -> editor-fixes Orijinal görüntüsünü görmek için buraya tıklayın. 672x532 px. si aprono due maschere (test-Fixes) nella prima (Original) ho copiato ed incollato la stringa I2CTuner da cambiare 0D0000000C00000000000000001200B8 (satycon-stark tec) mentre nella maschera sottostante (Patch) ho messo la stringa 0C0000000D00000000000000001200B8 (tyran/smart) e poi ho clikkato 1->applica e successivamente sul tasto 2->parchear Orijinal görüntüsünü görmek için buraya tıklayın. 672x532 px. e si è generato il firm con il tuner modificato per tyran & cloni Orijinal görüntüsünü görmek için buraya tıklayın. 672x473 px. Il risultato sarà un fw moddato con nome SATYCON_ALIFTA_V10.5_MOD-TEST_FIXED.abs salvato nella stessa cartella dove risiede il file originale. Attenzione che questo file così come creato non può essere inviato direttamente al dek in quanto necessita anche la modifica del custom ID come già ampiamente spiegato nei post precedenti. (Ali chipset tuner modifiyesi) Ali universal fixer