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Satellite PC Card Receivers, Internet by Satellite
diseqc motor driving issues with one of the LNBs
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<blockquote data-quote="deeptho" data-source="post: 1154487" data-attributes="member: 215446"><p>This isolation is often a problem on lnbs. I also saw it on some LNB yesterday when testing neumoDVB on one computer and watching CNN on TV. Each time I start neumoDVB a little bit of pixellation on CNN. It is one of those narrow neck lnbs.</p><p></p><p>About the WDB: I would argue that power consumption is not the only criterion, but rather</p><p>1) how does rotor react to the the transients at power up. In other words how fast does current increase and how well can equipment cope with that. I have see rotors go bonkers and stop working until reset. That is why neumoDVB never powers up from zero volt to 18Volt in one go. Instead it first goes to 12 V, waits a bit and then goes to 18V</p><p></p><p>2) what kind of transients does the lnb generate itself?</p><p></p><p>If possible, I would start by putting a scope on the system. I use a picoscope. I have cut a small hole in the mantle of some small extension cable, which allows me to grab the inner </p><p>conductor with a probe. This can disrupt RF of course, but that is immaterial for switching testing and I did not even notice an impact on the signals.</p><p></p><p>A workaround (alternative to the splitter solution) could to insert a diseqc switch between motor and lnb. Connect LNB to port 2, 3 or 4. FIrst send diseqc to control rotor. Afterwards send diseqc switch to connect it to port B. This may need software adjustment.</p><p></p><p>Or install the diseqc swicth before the rotor and connect the lnb to port 1 and the rotor </p><p>to port B. First select port B and tune the rotor. Then switch to A.</p><p></p><p>The annoying bit about the last workaround is that you need to know when the rotor has </p><p>stopped before cutting its power. Its advantage is that lnb influence is eliminated.</p></blockquote><p></p>
[QUOTE="deeptho, post: 1154487, member: 215446"] This isolation is often a problem on lnbs. I also saw it on some LNB yesterday when testing neumoDVB on one computer and watching CNN on TV. Each time I start neumoDVB a little bit of pixellation on CNN. It is one of those narrow neck lnbs. About the WDB: I would argue that power consumption is not the only criterion, but rather 1) how does rotor react to the the transients at power up. In other words how fast does current increase and how well can equipment cope with that. I have see rotors go bonkers and stop working until reset. That is why neumoDVB never powers up from zero volt to 18Volt in one go. Instead it first goes to 12 V, waits a bit and then goes to 18V 2) what kind of transients does the lnb generate itself? If possible, I would start by putting a scope on the system. I use a picoscope. I have cut a small hole in the mantle of some small extension cable, which allows me to grab the inner conductor with a probe. This can disrupt RF of course, but that is immaterial for switching testing and I did not even notice an impact on the signals. A workaround (alternative to the splitter solution) could to insert a diseqc switch between motor and lnb. Connect LNB to port 2, 3 or 4. FIrst send diseqc to control rotor. Afterwards send diseqc switch to connect it to port B. This may need software adjustment. Or install the diseqc swicth before the rotor and connect the lnb to port 1 and the rotor to port B. First select port B and tune the rotor. Then switch to A. The annoying bit about the last workaround is that you need to know when the rotor has stopped before cutting its power. Its advantage is that lnb influence is eliminated. [/QUOTE]
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Satellite PC Card Receivers, Internet by Satellite
diseqc motor driving issues with one of the LNBs
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