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Satellite Systems - What to Buy - What to install
Advice on install
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<blockquote data-quote="Captain Jack" data-source="post: 945367" data-attributes="member: 243342"><p>Stephen, your main issue was LNB setup - without correct local oscillator frequencies, you would never get a lock and you were luck to get a lock on 28E.</p><p></p><p>To explain how it works, let's take BBC World News frequency 10778 MHz. This is FAR too high a frequency for the cable to carry, which are limited to carry up to 2500 MHz. So, one of the LNB's main job is to convert those high frequencies to bring into a range that the cable can handle. This is where the local oscillator (LO) frequency comes in. For the frequency in the example, the LO is 9750 MHz. This essentially tells the LNB by how much the frequency should be dropped by. So, 10778 minus 9750 = 1028 MHz - that's the actual frequency that the receiver "sees" on the cable.</p><p></p><p>Now, there's a cut off point at 11700 MHz, where the LO changes from 9750 MHz to 10600 MHz - this is controlled by the 22 kHz tone (again don't touch this one either - leave it on auto). This means mean that satellite frequencies above 11700 MHz are being converted by 10600 MHz. So, a frequency of 12632 MHz on satellite is reduced by 10600 MHz to 2032 MHz for the cable to carry to the receiver.</p><p></p><p>There are two blocks of frequencies:</p><p></p><p>Low band: 10750 MHz to 11699 MHz - LO is 9750 and 22kHz is off</p><p>High band: 11700 MHz to 12750 MHz - LO is 10600 and 22kHz is on</p><p></p><p>Your low band LO was set to 11595 MHz, which means your entered frequency of 11637 was down-converted to just 42MHz. The lowest down-converted frequency possible is 1000 MHz (10750 minus 9750). With LO of 11595, you should potentially receive frequencies from around 12595 MHz to 12750 MHz, but the details would appear wrong on screen. This is probably what was happening with 28E.</p><p></p><p>OK, that's enough drilling... for now, just keep it simple.</p></blockquote><p></p>
[QUOTE="Captain Jack, post: 945367, member: 243342"] Stephen, your main issue was LNB setup - without correct local oscillator frequencies, you would never get a lock and you were luck to get a lock on 28E. To explain how it works, let's take BBC World News frequency 10778 MHz. This is FAR too high a frequency for the cable to carry, which are limited to carry up to 2500 MHz. So, one of the LNB's main job is to convert those high frequencies to bring into a range that the cable can handle. This is where the local oscillator (LO) frequency comes in. For the frequency in the example, the LO is 9750 MHz. This essentially tells the LNB by how much the frequency should be dropped by. So, 10778 minus 9750 = 1028 MHz - that's the actual frequency that the receiver "sees" on the cable. Now, there's a cut off point at 11700 MHz, where the LO changes from 9750 MHz to 10600 MHz - this is controlled by the 22 kHz tone (again don't touch this one either - leave it on auto). This means mean that satellite frequencies above 11700 MHz are being converted by 10600 MHz. So, a frequency of 12632 MHz on satellite is reduced by 10600 MHz to 2032 MHz for the cable to carry to the receiver. There are two blocks of frequencies: Low band: 10750 MHz to 11699 MHz - LO is 9750 and 22kHz is off High band: 11700 MHz to 12750 MHz - LO is 10600 and 22kHz is on Your low band LO was set to 11595 MHz, which means your entered frequency of 11637 was down-converted to just 42MHz. The lowest down-converted frequency possible is 1000 MHz (10750 minus 9750). With LO of 11595, you should potentially receive frequencies from around 12595 MHz to 12750 MHz, but the details would appear wrong on screen. This is probably what was happening with 28E. OK, that's enough drilling... for now, just keep it simple. [/QUOTE]
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Satellite Systems - What to Buy - What to install
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