Reply to thread

Message

<blockquote data-quote="John" data-source="post: 1124733" data-attributes="member: 175005">No you didn't miss it - I did a laser vid&nbsp; some time ago on my 1.8 CM test rig with the feed in the manufacturers position when i was building my test rig - it illuminated at the bottom of the dish but as it revolved around to the sides it started to over-illuminate and eventually the top the laser was about 12&quot; above the top of the dish and sucking in noise.After re-aligning the feed to the adjusted dimensions as per Rima's data it tracked perfectly and a&nbsp; few TP tests showed a better performance.I did the same on the 1.2 CM test rig at ground level using the manufacturers position and it was the same over-shoot at the sides and top of the antenna but i didn't video it.The modded feed holder position on the 1.2 CM to Rima's data sheet again corrected the illumination tracking and an increase of at least 1dB or more was observed on selected TP's over a short time period compared to the standard manufacturers position.It still remains a mystery why this adjusted lnb feed position should show to be better than the factory designed position from Channel Master but iv'e seen it now on two different CM dish sizes to give an increase in performance.&nbsp;&nbsp; Only useful to go to this extreme if your OCD is demanding you to eak the very last drop out of the dish for those border line lock channels or TP's&nbsp; ... normal people probably don't need to go to these extremes</blockquote>

[QUOTE="John, post: 1124733, member: 175005"] No you didn't miss it - I did a laser vid some time ago on my 1.8 CM test rig with the feed in the manufacturers position when i was building my test rig - it illuminated at the bottom of the dish but as it revolved around to the sides it started to over-illuminate and eventually the top the laser was about 12" above the top of the dish and sucking in noise. After re-aligning the feed to the adjusted dimensions as per Rima's data it tracked perfectly and a few TP tests showed a better performance. I did the same on the 1.2 CM test rig at ground level using the manufacturers position and it was the same over-shoot at the sides and top of the antenna but i didn't video it. The modded feed holder position on the 1.2 CM to Rima's data sheet again corrected the illumination tracking and an increase of at least 1dB or more was observed on selected TP's over a short time period compared to the standard manufacturers position. It still remains a mystery why this adjusted lnb feed position should show to be better than the factory designed position from Channel Master but iv'e seen it now on two different CM dish sizes to give an increase in performance. Only useful to go to this extreme if your OCD is demanding you to eak the very last drop out of the dish for those border line lock channels or TP's ... normal people probably don't need to go to these extremes [/QUOTE]

Verification