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DISH SETUP: Single sat, Multi-Sat & Motorised
C band LNB on Fibo 120?
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<blockquote data-quote="Captain Jack" data-source="post: 834337" data-attributes="member: 243342"><p>OK, the day has been sunny but bluddy cold! Did as much as I wanted to and here is the report.</p><p></p><p>First I tried simply replacing the Ku band LNB on the Fibo with the C band one using Trust's holder *without the feedhorn* and I got a decent signal (9d<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite6" alt=":cool:" title="Cool :cool:" loading="lazy" data-shortname=":cool:" /> on the Arabic channels on 3E in linear. This I could get on my 85cm dish. Then I swung the dish to 5W and stuck the depolariser plate that came with the LNB (looks like a thick piece of circuit board with the circuit on it). Managed to get some channels mainly in the higher band with ORTB being the strongest.</p><p></p><p>Next I tried placing the LNB *with* the feedhorn at an offset angle, next to the sub-reflector but got very, very poor results. The focal point of the LNB is a lot further than the sub-reflector and I think one of the LNB support arms was in the way. Either way, I couldn't get more than around 5dB on 3E so I abandoned that idea.</p><p></p><p>Next, I tried placing the LNB back where it was but this time with the feedhorn and, surprisingly, I got a better signal with it than without, despite me thinking that the huge feedhorn would be blocking some of the signal heading towards the sub-reflector.</p><p></p><p>[ATTACH]52368[/ATTACH]</p><p></p><p>I was now getting around 10.6dB on 3E channels without the depolariser plate and around 8dB with. So far so good. Made a few adjustments and a crappy and a very temporary holder, which I intend on replacing tomorrow with something studier.</p><p></p><p>Went scanning around the arc and have received the following satellites:</p><p></p><p>3E, 5W, 11W, 22W, 27.5W and 20E.</p><p></p><p>[ATTACH]52364[/ATTACH][ATTACH]52365[/ATTACH][ATTACH]52366[/ATTACH][ATTACH]52367[/ATTACH]</p><p></p><p>Had signal but no lock on 10E, 1W and a bunch of others.</p><p></p><p>[ATTACH]52362[/ATTACH][ATTACH]52363[/ATTACH]</p><p></p><p>I expected to receive 37.5W and 17E but got nothing at all from either of these satellites.</p><p></p><p>I cannot really see beyond 45E so couldn't test any of the more interesting (to me) channels.</p><p></p><p>My next step, I guess, is to fabricate my own depolariser plate to squeeze more out of circular channels but I need to read on it since I don't really know where to start! Unless someone can send me a few of their own to try? <img src="https://www.satellites.co.uk/styles/default/xenforo/smilies/smile.png" class="smilie" loading="lazy" alt=":)" title="Smile :)" data-shortname=":)" /></p><p></p><p>I also wonder how a 1.2m Channel Master will perform relative to the Fibo as Fibo isn't really designed for C band.....</p></blockquote><p></p>
[QUOTE="Captain Jack, post: 834337, member: 243342"] OK, the day has been sunny but bluddy cold! Did as much as I wanted to and here is the report. First I tried simply replacing the Ku band LNB on the Fibo with the C band one using Trust's holder *without the feedhorn* and I got a decent signal (9dB) on the Arabic channels on 3E in linear. This I could get on my 85cm dish. Then I swung the dish to 5W and stuck the depolariser plate that came with the LNB (looks like a thick piece of circuit board with the circuit on it). Managed to get some channels mainly in the higher band with ORTB being the strongest. Next I tried placing the LNB *with* the feedhorn at an offset angle, next to the sub-reflector but got very, very poor results. The focal point of the LNB is a lot further than the sub-reflector and I think one of the LNB support arms was in the way. Either way, I couldn't get more than around 5dB on 3E so I abandoned that idea. Next, I tried placing the LNB back where it was but this time with the feedhorn and, surprisingly, I got a better signal with it than without, despite me thinking that the huge feedhorn would be blocking some of the signal heading towards the sub-reflector. [ATTACH]52368.IPB[/ATTACH] I was now getting around 10.6dB on 3E channels without the depolariser plate and around 8dB with. So far so good. Made a few adjustments and a crappy and a very temporary holder, which I intend on replacing tomorrow with something studier. Went scanning around the arc and have received the following satellites: 3E, 5W, 11W, 22W, 27.5W and 20E. [ATTACH]52364.IPB[/ATTACH][ATTACH]52365.IPB[/ATTACH][ATTACH]52366.IPB[/ATTACH][ATTACH]52367.IPB[/ATTACH] Had signal but no lock on 10E, 1W and a bunch of others. [ATTACH]52362.IPB[/ATTACH][ATTACH]52363.IPB[/ATTACH] I expected to receive 37.5W and 17E but got nothing at all from either of these satellites. I cannot really see beyond 45E so couldn't test any of the more interesting (to me) channels. My next step, I guess, is to fabricate my own depolariser plate to squeeze more out of circular channels but I need to read on it since I don't really know where to start! Unless someone can send me a few of their own to try? :) I also wonder how a 1.2m Channel Master will perform relative to the Fibo as Fibo isn't really designed for C band..... [/QUOTE]
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DISH SETUP: Single sat, Multi-Sat & Motorised
C band LNB on Fibo 120?
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