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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Dead DiSEqC Switch
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<blockquote data-quote="Terryl" data-source="post: 1013828" data-attributes="member: 369937"><p>Screwdriver or BFH....It still will be FUBAR, a Diseqc switch is basically a transistorized switch controlled by a 22 kHz tone or tone pulses telling it what port to activate.</p><p></p><p>It also supplies DC power to the selected device or devices, if you have an understanding of electronics here is a simple schematic diagram of one.</p><p>[ATTACH=full]106470[/ATTACH] </p><p></p><p>The satellite receiver (connected to port XS1) selects the proper LNB by sending the switch a series of 22 kHz pulses, this input port also supplies the necessary DC power to run the switch and the attached LNB's.</p><p></p><p>The Diseqc decoder IC (DD1) decodes the commands and selects the proper port by turning on a set of power transistors, this turns on the correct LNB by supplying the DC power it needs to run, some LNB's also use a DC switching voltage to select the correct transponder polarity, the switch does not care what the DC voltage is, it just supply's what DC voltage what is coming in on the input, this could be +14 or +18 volts DC.</p><p></p><p>Now when the switch has turned on the correct LNB it has a direct signal path back to the receiver, the other LNB's are tuned off, so they can affect the signals from the selected LNB.</p><p></p><p>Now a multi receiver switch is far more complicated then this simple single receiver to 4 LNB's switch.</p><p></p><p>If you want me to tell you how that type works it will cost you a case of Scotch and you will have to wait till I find my professors hat.</p></blockquote><p></p>
[QUOTE="Terryl, post: 1013828, member: 369937"] Screwdriver or BFH....It still will be FUBAR, a Diseqc switch is basically a transistorized switch controlled by a 22 kHz tone or tone pulses telling it what port to activate. It also supplies DC power to the selected device or devices, if you have an understanding of electronics here is a simple schematic diagram of one. [ATTACH=full]106470[/ATTACH] The satellite receiver (connected to port XS1) selects the proper LNB by sending the switch a series of 22 kHz pulses, this input port also supplies the necessary DC power to run the switch and the attached LNB's. The Diseqc decoder IC (DD1) decodes the commands and selects the proper port by turning on a set of power transistors, this turns on the correct LNB by supplying the DC power it needs to run, some LNB's also use a DC switching voltage to select the correct transponder polarity, the switch does not care what the DC voltage is, it just supply's what DC voltage what is coming in on the input, this could be +14 or +18 volts DC. Now when the switch has turned on the correct LNB it has a direct signal path back to the receiver, the other LNB's are tuned off, so they can affect the signals from the selected LNB. Now a multi receiver switch is far more complicated then this simple single receiver to 4 LNB's switch. If you want me to tell you how that type works it will cost you a case of Scotch and you will have to wait till I find my professors hat. [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Dead DiSEqC Switch
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