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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Cold \ Frost - better signal
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<blockquote data-quote="Terryl" data-source="post: 1139275" data-attributes="member: 369937"><p>It could be that the crystal oscillator in the LNB is moving closer to the correct frequency needed for the down conversion, most LNB's use a Phase Locked Loop circuit to derive the correct down conversion frequency (the LO frequency) of the satellite transponders, the PLL circuit relies on a crystal to keep it on a set frequency, if the crystal is off a bit (too high or low) so is your down-conversion frequency.</p><p></p><p>The cold weather is causing the crystal to move up or down, thus moving the PLL frequency closer to the correct down conversion frequency.</p><p></p><p>Professional quality LNB's use a Temperature Controlled crystal oscillator circuit (TCXO) to keep things on the right frequency.</p><p></p><p></p><p></p><p>Sorry, too much coffee...</p></blockquote><p></p>
[QUOTE="Terryl, post: 1139275, member: 369937"] It could be that the crystal oscillator in the LNB is moving closer to the correct frequency needed for the down conversion, most LNB's use a Phase Locked Loop circuit to derive the correct down conversion frequency (the LO frequency) of the satellite transponders, the PLL circuit relies on a crystal to keep it on a set frequency, if the crystal is off a bit (too high or low) so is your down-conversion frequency. The cold weather is causing the crystal to move up or down, thus moving the PLL frequency closer to the correct down conversion frequency. Professional quality LNB's use a Temperature Controlled crystal oscillator circuit (TCXO) to keep things on the right frequency. Sorry, too much coffee... [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Cold \ Frost - better signal
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