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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Interference between signals on dual output lnb?
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<blockquote data-quote="Channel Hopper" data-source="post: 11409" data-attributes="member: 175144"><p>It could be that the signals used at RF for both recveivers have not followed the N+5 and N+9 rule where none of the broadcast frequencies should be set either 40 or 72MHz from each other.</p><p></p><p>However inside the more modern receivers are many operating frequencies.</p><p></p><p>Those from the PSU (switchmode), the tuner/demodulator, the main and sub processor circuits, each with their own crystal or oscillator settings.</p><p></p><p>Each creates both main and harmonic frequencies, and owing to the nature of the beast, these are rarely filtered out completely, leaving some to propogate to the rear panel connections. </p><p></p><p>CE approval does have specific requirements for output signals through the usual RF, SCART and accessory ports, but these are rarely if ever adhered to once full production has started on a product</p><p></p><p>I believe that whichever receiver was fitted in the RF chain first was the one that has a fault and the frequencies generated have created interference with the RF output</p><p></p><p>Sometimes however the individual boxes can interfere with each other as a matter of RF connections being made in a fashion that generates trouble on their own.</p></blockquote><p></p>
[QUOTE="Channel Hopper, post: 11409, member: 175144"] It could be that the signals used at RF for both recveivers have not followed the N+5 and N+9 rule where none of the broadcast frequencies should be set either 40 or 72MHz from each other. However inside the more modern receivers are many operating frequencies. Those from the PSU (switchmode), the tuner/demodulator, the main and sub processor circuits, each with their own crystal or oscillator settings. Each creates both main and harmonic frequencies, and owing to the nature of the beast, these are rarely filtered out completely, leaving some to propogate to the rear panel connections. CE approval does have specific requirements for output signals through the usual RF, SCART and accessory ports, but these are rarely if ever adhered to once full production has started on a product I believe that whichever receiver was fitted in the RF chain first was the one that has a fault and the frequencies generated have created interference with the RF output Sometimes however the individual boxes can interfere with each other as a matter of RF connections being made in a fashion that generates trouble on their own. [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Interference between signals on dual output lnb?
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