Reply to thread

Message

<blockquote data-quote="jeallen01" data-source="post: 1080746" data-attributes="member: 176704">A) When at the central position (of the arc for a motorised dish) most offset dishes will be roughly &quot;horizontal&quot;, but the received beam will be coming in from angle of around 22-24 degrees above that (before it is reflected to the LNB on the feedarm).B&nbsp; ) Assuming that the &quot;pitch&quot; of that roof is effectively a straight sloping line then the actual effect will be dependent on the height of the ridge tiles on the top, and they will be slightly further from the dish than the wall, but it is whichever of the gutter or the top of the ridge that first intercepts it that will determine how &quot;high&quot; that house is in this context.That effect gets more significant as a motorised dish swings towards the edges of the arc because sats in those positions are progressively lower in the sky&nbsp; - I have this issue with the sats to the East as as the roof of a new house stops anything beyond about 53E being received, and even 53E is very iffy and weather dependent - whereas a previous smaller dish used to get to around 56E before that house was built. Maybe that's a diffraction/signal loss effect as the beam is close to &quot;clipping&quot; the highest point?PS: you can see that house in the 1st &amp; 3rd images in my &quot;We see no dishes!&quot; thread posted on Christmas Day.</blockquote>

[QUOTE="jeallen01, post: 1080746, member: 176704"] A) When at the central position (of the arc for a motorised dish) most offset dishes will be roughly "horizontal", but the received beam will be coming in from angle of around 22-24 degrees above that (before it is reflected to the LNB on the feedarm). B ) Assuming that the "pitch" of that roof is effectively a straight sloping line then the actual effect will be dependent on the height of the ridge tiles on the top, and they will be slightly further from the dish than the wall, but it is whichever of the gutter or the top of the ridge that first intercepts it that will determine how "high" that house is in this context. That effect gets more significant as a motorised dish swings towards the edges of the arc because sats in those positions are progressively lower in the sky - I have this issue with the sats to the East as as the roof of a new house stops anything beyond about 53E being received, and even 53E is very iffy and weather dependent - whereas a previous smaller dish used to get to around 56E before that house was built. Maybe that's a diffraction/signal loss effect as the beam is close to "clipping" the highest point? PS: you can see that house in the 1st & 3rd images in my "We see no dishes!" thread posted on Christmas Day. [/QUOTE]

Verification