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<blockquote data-quote="2old4this" data-source="post: 4426" data-attributes="member: 174998">In London, 1m should be sufficient for all signals, even on a monoblock arrangement.There is no &quot;default&quot; left or right LNB which picks up the signals. To understand what's going on, you need to visualise where the satellites are in the sky, and what is happening to the signals as they are reflected from the dish to the LNBs.For those of us in the northern hemisphere, the Hotbird cluster of satellites (13 degrees east) appear to the right of the Astra1 cluster (19.2east).The dish should be aimed between the two - at 16east.Then, the signal from Hotbird comes down from the right and is reflected by the dish to the left. The signal from Astra comes down from the left, so is reflected by the dish off to the right. Therefore, looking upwards from the dish to your monoblock, it is the right LNB which receives Astra, and the left one which receives Hotbird.But imagine that you (mis-)aligned the dish too far left (east) so that both Astra and Hotbird were &quot;on the right&quot;. In that case, both signals would be bouncing in from the right and be reflected off to the left. The result could be that the Hotbird signal misses the monoblock altogether, but that the Astra signal finds the left LNB that normally would receive the Hotbird signals. So you need to be careful. If I were you, I would use a simple-stupid method of making sure the signals you are getting are on the &quot;correct&quot; LNB. Simply obscure one of the feedhorns (place something over the front of one half which is opaque to microwaves - such as a damp piece of cardboard). Then you KNOW that any signal you can get is coming from the OTHER LNB, and can derive conclusions on which DiSEqC setings are doing what - as well as whether your dish is aligned (if you blocked off the right LNB and still got Astra you know your dish is too far to the left).2old</blockquote>

[QUOTE="2old4this, post: 4426, member: 174998"] In London, 1m should be sufficient for all signals, even on a monoblock arrangement. There is no "default" left or right LNB which picks up the signals. To understand what's going on, you need to visualise where the satellites are in the sky, and what is happening to the signals as they are reflected from the dish to the LNBs. For those of us in the northern hemisphere, the Hotbird cluster of satellites (13 degrees east) appear to the right of the Astra1 cluster (19.2east). The dish should be aimed between the two - at 16east. Then, the signal from Hotbird comes down from the right and is reflected by the dish to the left. The signal from Astra comes down from the left, so is reflected by the dish off to the right. Therefore, looking upwards from the dish to your monoblock, it is the right LNB which receives Astra, and the left one which receives Hotbird. But imagine that you (mis-)aligned the dish too far left (east) so that both Astra and Hotbird were "on the right". In that case, both signals would be bouncing in from the right and be reflected off to the left. The result could be that the Hotbird signal misses the monoblock altogether, but that the Astra signal finds the left LNB that normally would receive the Hotbird signals. So you need to be careful. If I were you, I would use a simple-stupid method of making sure the signals you are getting are on the "correct" LNB. Simply obscure one of the feedhorns (place something over the front of one half which is opaque to microwaves - such as a damp piece of cardboard). Then you KNOW that any signal you can get is coming from the OTHER LNB, and can derive conclusions on which DiSEqC setings are doing what - as well as whether your dish is aligned (if you blocked off the right LNB and still got Astra you know your dish is too far to the left). 2old [/QUOTE]

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