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Multi-receiver/TV systems - Domestic only
please help me with my special situation
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<blockquote data-quote="a33" data-source="post: 1030551" data-attributes="member: 332642"><p>As I wrote: Though it can work, I'm no fan of hard switches in setups like these. However, re-reading the complete topic again, I thought of a kind of electronic relay that is on the (european) market already, and does about what you want: the (smart) priority switch! That gives (voltage) control to the 'master port', when that carries power; but when the master port doesn't carry power, the 'slave port' gets power control, and powers the LNB. So it acts like a kind of splitter, which lets the 'master port' power the LNB, and when the master is powerless, the slave powers (and controls) the LNB.</p><p>However, the switching inside the priority switch is done by PIN-diodes, it seems. That means when the master has power, the slave also has signal, but with somewhat irregular signal loss on some frequencies! <strong>When used with 2 stb's, i've never seen reports of problems</strong>, but I don't know if that would be the same with two MSs, as you have.</p><p>I've also never seen reported that the PIN-diode of the slave port was bypassed with (or replaced by) a capacitor, to prevent this irregular signal loss to the slave port. Would be an interesting test for some hobbyist. <img src="https://www.satellites.co.uk/styles/default/xenforo/smilies/smile.png" class="smilie" loading="lazy" alt=":)" title="Smile :)" data-shortname=":)" /></p><p></p><p>I think this kind of solution would be a good try! It would mean continued power to the LNB when MS1 is powerles, but MS2 wants signal. And no 22kHz interference problems, as that is taken care of by the priority switch as well.</p><p>Your 0/22kHz switch would still be needed in this setup, though.</p><p></p><p></p><p></p><p>Thinking further through this line of solving:</p><p>Your MSs give up to 16 volt, but your LNB needs 18 Volts?</p><p>Then you would need a 18 volt power supply, and a 3-way splitter, with all ports ports power pass ONE WAY (with diodes).</p><p>If three ports have (one way) power pass, the 18 volts on one of the ports 'overrules' the 16 volts + superimposed 22 kHz. The power supply port needs a coil of some uH, though, to stop the RF signal to the power supply.</p><p>I must say: <strong>I've never tested this myself, or seen it tested</strong>. I understand your worry about the 22kHz; in the worst case you still need your 0/22kHz switch inbetween.</p><p>I'm not sure if this worry might even be worse in case of a splitter with only ONE port power pass, with the power supply connected to that, and the others don't having power pass. Your 0/22kHz switch might also still be needed in that setup? I 'm not an electronic engineer, alas, so I am not sure of the effects of such splitter-setups....</p><p></p><p></p><p>Your 0/22 kHz switch still is a creative solution for a 22kHz blocker, that I've never thought of before. ;)</p><p>As I've never seen anyone connecting a 0 kHz LNB to a 22 kHz port of a multiswitch before... <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /></p><p></p><p></p><p></p><p>More often I see the use of cascaded multiswitches. So the splitting is done inside of the MSs. Have you thought about such a solution too? Or is that hardly possible in your case?</p><p>Powering receiver-fed multiswitches is an issue here also; with more difficult setups (and multiple multiswitches) people often will use a MS with external power supply again. So that questions such as yours don't arise.</p><p></p><p>The lower voltage of 11/15 volts in your case does cause extra concerns, as does your 0kHz LNB on a 22kHz port.</p><p>It's a challange to think of solutions, though!</p><p></p><p>I hope I helped you with my thoughts. No guarantees that my solutions would work. Your questions, however, are not standard as well.... <img src="https://www.satellites.co.uk/styles/default/xenforo/smilies/smile.png" class="smilie" loading="lazy" alt=":)" title="Smile :)" data-shortname=":)" /></p><p></p><p>Greetz,</p><p>A33</p><p></p><p><em>Edit: BTW, anyone else on this forum with experience of the effects of (power passing) splitters, and the YES/NO passing of 22kHz signal from various ports? Would be nice to know how these splitters react, in practice.</em></p></blockquote><p></p>
[QUOTE="a33, post: 1030551, member: 332642"] As I wrote: Though it can work, I'm no fan of hard switches in setups like these. However, re-reading the complete topic again, I thought of a kind of electronic relay that is on the (european) market already, and does about what you want: the (smart) priority switch! That gives (voltage) control to the 'master port', when that carries power; but when the master port doesn't carry power, the 'slave port' gets power control, and powers the LNB. So it acts like a kind of splitter, which lets the 'master port' power the LNB, and when the master is powerless, the slave powers (and controls) the LNB. However, the switching inside the priority switch is done by PIN-diodes, it seems. That means when the master has power, the slave also has signal, but with somewhat irregular signal loss on some frequencies! [B]When used with 2 stb's, i've never seen reports of problems[/B], but I don't know if that would be the same with two MSs, as you have. I've also never seen reported that the PIN-diode of the slave port was bypassed with (or replaced by) a capacitor, to prevent this irregular signal loss to the slave port. Would be an interesting test for some hobbyist. :) I think this kind of solution would be a good try! It would mean continued power to the LNB when MS1 is powerles, but MS2 wants signal. And no 22kHz interference problems, as that is taken care of by the priority switch as well. Your 0/22kHz switch would still be needed in this setup, though. Thinking further through this line of solving: Your MSs give up to 16 volt, but your LNB needs 18 Volts? Then you would need a 18 volt power supply, and a 3-way splitter, with all ports ports power pass ONE WAY (with diodes). If three ports have (one way) power pass, the 18 volts on one of the ports 'overrules' the 16 volts + superimposed 22 kHz. The power supply port needs a coil of some uH, though, to stop the RF signal to the power supply. I must say: [B]I've never tested this myself, or seen it tested[/B]. I understand your worry about the 22kHz; in the worst case you still need your 0/22kHz switch inbetween. I'm not sure if this worry might even be worse in case of a splitter with only ONE port power pass, with the power supply connected to that, and the others don't having power pass. Your 0/22kHz switch might also still be needed in that setup? I 'm not an electronic engineer, alas, so I am not sure of the effects of such splitter-setups.... Your 0/22 kHz switch still is a creative solution for a 22kHz blocker, that I've never thought of before. ;) As I've never seen anyone connecting a 0 kHz LNB to a 22 kHz port of a multiswitch before... :D More often I see the use of cascaded multiswitches. So the splitting is done inside of the MSs. Have you thought about such a solution too? Or is that hardly possible in your case? Powering receiver-fed multiswitches is an issue here also; with more difficult setups (and multiple multiswitches) people often will use a MS with external power supply again. So that questions such as yours don't arise. The lower voltage of 11/15 volts in your case does cause extra concerns, as does your 0kHz LNB on a 22kHz port. It's a challange to think of solutions, though! I hope I helped you with my thoughts. No guarantees that my solutions would work. Your questions, however, are not standard as well.... :) Greetz, A33 [I]Edit: BTW, anyone else on this forum with experience of the effects of (power passing) splitters, and the YES/NO passing of 22kHz signal from various ports? Would be nice to know how these splitters react, in practice.[/I] [/QUOTE]
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please help me with my special situation
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