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Satellite TV receivers & systems support forums
Fringe Reception General
fibre lnb from global invacom
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<blockquote data-quote="halb" data-source="post: 687813" data-attributes="member: 259442"><p>Perhaps I should have investigated a bit further regarding the noise figure of the Fiber LNB from Invacom before actually buying one. The data sheet says 0.5 dB. I think that is what you get. I've spent a good 3 days fine tuning the fiber lnb now and it performs poorly compared with my existing Invacom quatro QTF 031 or Swedish Microwave single polarity LNB's. I've lost most of the fringe reception channels I was aiming at (1 deg W - in a "deep null" area close to Barcelona). It is difficult adjusting this LNB as the analogue-digital-analogue conversion (LNB->fiber optic cable, MDU box -> standard output), seems to cause the signal to arrive at the receiver in discrete steps of 4%, where previously I could detect variations of 1%. The more powerful stations have improved significantly, the ones without bad weather reserve have disappeared altogether. Now, I'm about to mount the good old QTF 031 again and regain the hazzle of having to use more than one receiver (DiseqC swithes are ruled out as the loss in them eats away all my signal, so I've been using one receiver for each polarity VH,VL,HH and HL). Perhaps like fellow member Snap I also received one of the poorer Fiber LNBs - after all half of them must be below average - but unless I did something wrong in which case there's still hope, I'll go back to the safe old technology. I'd appreciate any help anyone might have on this topic as well as links to non-commercial testing reports. My dish is a prime-focus 3.1 meter (25meter antenna cable), all lnb's I've tested are also prime focus versions using the standard C120 adjustable feedhorn from Invacom.</p></blockquote><p></p>
[QUOTE="halb, post: 687813, member: 259442"] Perhaps I should have investigated a bit further regarding the noise figure of the Fiber LNB from Invacom before actually buying one. The data sheet says 0.5 dB. I think that is what you get. I've spent a good 3 days fine tuning the fiber lnb now and it performs poorly compared with my existing Invacom quatro QTF 031 or Swedish Microwave single polarity LNB's. I've lost most of the fringe reception channels I was aiming at (1 deg W - in a "deep null" area close to Barcelona). It is difficult adjusting this LNB as the analogue-digital-analogue conversion (LNB->fiber optic cable, MDU box -> standard output), seems to cause the signal to arrive at the receiver in discrete steps of 4%, where previously I could detect variations of 1%. The more powerful stations have improved significantly, the ones without bad weather reserve have disappeared altogether. Now, I'm about to mount the good old QTF 031 again and regain the hazzle of having to use more than one receiver (DiseqC swithes are ruled out as the loss in them eats away all my signal, so I've been using one receiver for each polarity VH,VL,HH and HL). Perhaps like fellow member Snap I also received one of the poorer Fiber LNBs - after all half of them must be below average - but unless I did something wrong in which case there's still hope, I'll go back to the safe old technology. I'd appreciate any help anyone might have on this topic as well as links to non-commercial testing reports. My dish is a prime-focus 3.1 meter (25meter antenna cable), all lnb's I've tested are also prime focus versions using the standard C120 adjustable feedhorn from Invacom. [/QUOTE]
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Fringe Reception General
fibre lnb from global invacom
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