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DISH SETUP: Single sat, Multi-Sat & Motorised
KA Band section
Turksat 4A Ka Band A now active
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<blockquote data-quote="deeptho" data-source="post: 1143316" data-attributes="member: 215446"><p>My first ever Ka-band result. Unfortunately only 1 mux so far, and a spectrum which has many false peaks.</p><p>This is on a 1.2M dish. I found 2 other muxes in the spectrum, one with a decent signal but only data.</p><p></p><p>The LNB is in an offset position, which actually made it easier to adust the focal spot without potentially detuning the dish</p><p>for Ku (I spent much time on that). I found an initial approximation by using a Ku LNB in the offset position first. This gave me a signal</p><p>a strong as the main Ku-band LNB. After inserting the kA LNB I got a 1dB signal in the spectrum. With some more fiddling I could</p><p>elevate the signal on 18768L to about 5dB. The LNB is not yet rigidly secured. This is using a chinese LNB (BWEI).</p><p></p><p>Could the false spectral peaks be the result of some resonance due to the depolarising plate (that probably</p><p>did not originally come with the LN<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite6" alt=":cool:" title="Cool :cool:" loading="lazy" data-shortname=":cool:" />? The peaks are huge in value and they can also be seen on the V8 finder, so they are not</p><p>a problem with neumoDVB or with the DVB card. </p><p></p><p>I also noted that tbs6909x can better cope with this weird spectrum than the tbs5927. It locks faster for example.</p><p></p><p>Have others also encountered such false peaks ok Ka LNBs? I seem to remember reading something about a similar problem but can't find the </p><p>relevant thread (may not even be on this forum). The peaks are very strong, often occur at the same frequencies (with sometimes a small difference in frequency) and they are definitively not coming from a satellite.</p><p></p><p>In any case, it is a start. In the screenshot 4 real muxes are present. All the other peaks, especially the huge ones, are fake.</p><p></p><p>In the process of testing I found and fixed several minor bugs in neumoDVB. These will be committed later. </p><p></p><p>I also noticed that attaching an inclinometer to a rotor can magically move the dish. Probably this is due to the magnets</p><p>in the inclinomater generating signals causing the rotor to reset. :-<</p><p></p><p>[ATTACH=full]147817[/ATTACH][ATTACH=full]147819[/ATTACH]</p></blockquote><p></p>
[QUOTE="deeptho, post: 1143316, member: 215446"] My first ever Ka-band result. Unfortunately only 1 mux so far, and a spectrum which has many false peaks. This is on a 1.2M dish. I found 2 other muxes in the spectrum, one with a decent signal but only data. The LNB is in an offset position, which actually made it easier to adust the focal spot without potentially detuning the dish for Ku (I spent much time on that). I found an initial approximation by using a Ku LNB in the offset position first. This gave me a signal a strong as the main Ku-band LNB. After inserting the kA LNB I got a 1dB signal in the spectrum. With some more fiddling I could elevate the signal on 18768L to about 5dB. The LNB is not yet rigidly secured. This is using a chinese LNB (BWEI). Could the false spectral peaks be the result of some resonance due to the depolarising plate (that probably did not originally come with the LNB)? The peaks are huge in value and they can also be seen on the V8 finder, so they are not a problem with neumoDVB or with the DVB card. I also noted that tbs6909x can better cope with this weird spectrum than the tbs5927. It locks faster for example. Have others also encountered such false peaks ok Ka LNBs? I seem to remember reading something about a similar problem but can't find the relevant thread (may not even be on this forum). The peaks are very strong, often occur at the same frequencies (with sometimes a small difference in frequency) and they are definitively not coming from a satellite. In any case, it is a start. In the screenshot 4 real muxes are present. All the other peaks, especially the huge ones, are fake. In the process of testing I found and fixed several minor bugs in neumoDVB. These will be committed later. I also noticed that attaching an inclinometer to a rotor can magically move the dish. Probably this is due to the magnets in the inclinomater generating signals causing the rotor to reset. :-< [ATTACH type="full"]147817[/ATTACH][ATTACH type="full"]147819[/ATTACH] [/QUOTE]
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DISH SETUP: Single sat, Multi-Sat & Motorised
KA Band section
Turksat 4A Ka Band A now active
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