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DISH SETUP: Single sat, Multi-Sat & Motorised
Eutelsat 8B, 8W -Weird spectrum analyser traces
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<blockquote data-quote="jeallen01" data-source="post: 994731" data-attributes="member: 176704"><p>I have now got vma's s/w running the 138MHz-4GHz Simple S/A connected to the LNB pass-through o/p on my TM5402-3 and am scanning some of the LNBs for the sats that the machine can connect to via the DiSEqC switch.</p><p></p><p>Most of the spectrums look fairly “normal”, except for those on 8W High Band, where I am consistently seeing something like in the attached screen shots - one is of the full High Band, and the other is from when I narrowed the frequency range</p><p></p><p>The traces at the lower end of the spectrum are jumping around, second by second, from about +16dB to -40dB of the “average” background levels at those frequencies - there was about an hour between the two screenshots, but I was getting the same thing 2 days ago, and so it's not a short-term occurrence.</p><p></p><p>So far, I haven’t seen this on any of the other sats I’ve looked at <u>- any thoughts on what those signals are, or, if they are artefacts, then what might be causing them</u>?</p><p>(vma suggested corroded connectors, but I don't think that's the reason or I think I would have seen the same thing on the same frequency ranges on from the other LNBs, which have all been installed on a total of 3 dishes this year</p><p>My own left-side thought is that this is a sign of a failing LNB on the dish for that sat. OTOH, could it be a sign of a failing transponder, or something else, actually on the satellite?)</p><p></p><p>Thanks in advance.</p><p></p><p>John</p></blockquote><p></p>
[QUOTE="jeallen01, post: 994731, member: 176704"] I have now got vma's s/w running the 138MHz-4GHz Simple S/A connected to the LNB pass-through o/p on my TM5402-3 and am scanning some of the LNBs for the sats that the machine can connect to via the DiSEqC switch. Most of the spectrums look fairly “normal”, except for those on 8W High Band, where I am consistently seeing something like in the attached screen shots - one is of the full High Band, and the other is from when I narrowed the frequency range The traces at the lower end of the spectrum are jumping around, second by second, from about +16dB to -40dB of the “average” background levels at those frequencies - there was about an hour between the two screenshots, but I was getting the same thing 2 days ago, and so it's not a short-term occurrence. So far, I haven’t seen this on any of the other sats I’ve looked at [U]- any thoughts on what those signals are, or, if they are artefacts, then what might be causing them[/U]? (vma suggested corroded connectors, but I don't think that's the reason or I think I would have seen the same thing on the same frequency ranges on from the other LNBs, which have all been installed on a total of 3 dishes this year My own left-side thought is that this is a sign of a failing LNB on the dish for that sat. OTOH, could it be a sign of a failing transponder, or something else, actually on the satellite?) Thanks in advance. John [/QUOTE]
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DISH SETUP: Single sat, Multi-Sat & Motorised
Eutelsat 8B, 8W -Weird spectrum analyser traces
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