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<blockquote data-quote="s-band" data-source="post: 963050" data-attributes="member: 407744">I’m just getting back into satellite stuff and refurbishing my 1988ish IRTE 1.5m PF dish. I tried a Titanium C1W LNBF taped to the side of the Ku LNB and it wasn’t too bad so I decided to make a more permanent mount.. I took a photo of the Ku feed with the camera back on the rear of the dish. That was printed 1:1 to use as a template to cut the scalar ring to avoid the tripod rod and to mark out the fixing positions. I aligned the new feed using a line parallel to the two top tripod rods. The scalar ring is mounted using one of the existing feed bolts (torx screw in photo) and an M3 fixing drilled and tapped into the Ku feed clamp. The scalar ring is not really in the right position relative to the focal point of the dish but it works ok adjusting the LNBF position for best signal and ignoring the setting for f/d of the dish. The offset is about 5.5 degrees (orbital position) relative to the Ku feed. The photo looking directly at the feeds was taken with the dish pointing to 55.5W on C band. Only the narrower bandwidth signals manage to crawl through the trees but it works. I’ve attached&nbsp; couple of xml files from EBSPro for 40W &amp; 55.5W. 40W is reasonably clear of the trees. I think the performance is probably 1-2dB below what it should be if the C band feed were at the prime focus. I can’t lock anything that is much lower than 38dBW eirp. I used to have a 10ft Winegard on C band (and regret selling it!) which could manage around 30dBW with a lot of sparklies. That sort of ties in with -6dB loss for 1.5m vs. 3m and 2dB for the bodged feed position.[ATTACH]91097[/ATTACH] [ATTACH]91098[/ATTACH]</blockquote>

[QUOTE="s-band, post: 963050, member: 407744"] I’m just getting back into satellite stuff and refurbishing my 1988ish IRTE 1.5m PF dish. I tried a Titanium C1W LNBF taped to the side of the Ku LNB and it wasn’t too bad so I decided to make a more permanent mount.. I took a photo of the Ku feed with the camera back on the rear of the dish. That was printed 1:1 to use as a template to cut the scalar ring to avoid the tripod rod and to mark out the fixing positions. I aligned the new feed using a line parallel to the two top tripod rods. The scalar ring is mounted using one of the existing feed bolts (torx screw in photo) and an M3 fixing drilled and tapped into the Ku feed clamp. The scalar ring is not really in the right position relative to the focal point of the dish but it works ok adjusting the LNBF position for best signal and ignoring the setting for f/d of the dish. The offset is about 5.5 degrees (orbital position) relative to the Ku feed. The photo looking directly at the feeds was taken with the dish pointing to 55.5W on C band. Only the narrower bandwidth signals manage to crawl through the trees but it works. I’ve attached couple of xml files from EBSPro for 40W & 55.5W. 40W is reasonably clear of the trees. I think the performance is probably 1-2dB below what it should be if the C band feed were at the prime focus. I can’t lock anything that is much lower than 38dBW eirp. I used to have a 10ft Winegard on C band (and regret selling it!) which could manage around 30dBW with a lot of sparklies. That sort of ties in with -6dB loss for 1.5m vs. 3m and 2dB for the bodged feed position. [ATTACH]91097[/ATTACH] [ATTACH]91098[/ATTACH] [/QUOTE]

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