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Dreambox Support Forum
Help to tune for C-Band Chanels in 600PVR
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<blockquote data-quote="izefisherman" data-source="post: 402150" data-attributes="member: 233523"><p>Option two is really only needed if the receiver cannot be configured for a LOF of 5150MHz. The C vs. fake Ku band frequency math only fools the tuner to tune the right IF frequency with a Ku-band frequency input. C and Ku band only exist in the LNB, the same downconverted frequency band is used in both cases. </p><p></p><p>To make option 2 work in your case you cannot enter LOF 5150MHz in the DM600PVR LNB setup. You have to use the universal Ku-band setup 9750/10600MHz with switchover at 11700MHz, then connect the C-band LNB and enter a calculated "fake" Ku-band frequency. I can confirm it works well, I use the trick frequently as my experimental 120cm dish carries a Ku-band LNB one day and a C-band LNB the next day and I don't want to change settings for that LNB all the time. </p><p></p><p>Looking at the specs for your LNB reveals it is a special type that receives and converts V and H simultaneously. Then only horizontal channels will work if LOF 5150MHz is entered. If you want to use option 2 with both polarisations you must use 5750MHz in the conversion formula for vertical frequencies. It is also a good idea to set the switchover frequency to a higher value than 11700MHz, say 12100MHz as you want to use the full input frequency range of the tuner in this case as the vertical channels will appear above the horizontals on the IF band. </p><p></p><p>So this dual LOF C-band LNB complicates things a bit, the originally suggested options were meant for a typical voltage switching V/H (L/R) C-band LNB with a LOF of 5150MHz. But even your case can be overcome using fake frequencies if the receiver can't handle the special LNB by default.</p><p></p><p></p><p></p><p>I don't understand this statement. If Mathew (or anyone) wants to use a C-band LNB with a receiver set up for a Universal Ku-band LNB the suggested conversion math applies perfectly and must be used to fool the receiver into tuning the right IF frequency.</p></blockquote><p></p>
[QUOTE="izefisherman, post: 402150, member: 233523"] Option two is really only needed if the receiver cannot be configured for a LOF of 5150MHz. The C vs. fake Ku band frequency math only fools the tuner to tune the right IF frequency with a Ku-band frequency input. C and Ku band only exist in the LNB, the same downconverted frequency band is used in both cases. To make option 2 work in your case you cannot enter LOF 5150MHz in the DM600PVR LNB setup. You have to use the universal Ku-band setup 9750/10600MHz with switchover at 11700MHz, then connect the C-band LNB and enter a calculated "fake" Ku-band frequency. I can confirm it works well, I use the trick frequently as my experimental 120cm dish carries a Ku-band LNB one day and a C-band LNB the next day and I don't want to change settings for that LNB all the time. Looking at the specs for your LNB reveals it is a special type that receives and converts V and H simultaneously. Then only horizontal channels will work if LOF 5150MHz is entered. If you want to use option 2 with both polarisations you must use 5750MHz in the conversion formula for vertical frequencies. It is also a good idea to set the switchover frequency to a higher value than 11700MHz, say 12100MHz as you want to use the full input frequency range of the tuner in this case as the vertical channels will appear above the horizontals on the IF band. So this dual LOF C-band LNB complicates things a bit, the originally suggested options were meant for a typical voltage switching V/H (L/R) C-band LNB with a LOF of 5150MHz. But even your case can be overcome using fake frequencies if the receiver can't handle the special LNB by default. I don't understand this statement. If Mathew (or anyone) wants to use a C-band LNB with a receiver set up for a Universal Ku-band LNB the suggested conversion math applies perfectly and must be used to fool the receiver into tuning the right IF frequency. [/QUOTE]
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Linux Based Receivers
Dreambox Support Forum
Help to tune for C-Band Chanels in 600PVR
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