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Terrestrial Broadcasting
Terrestrial Television, Digital and Analogue
Switch Mode Power Supply Woes - New Aerial/Mast head amplifier.
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<blockquote data-quote="Terryl" data-source="post: 1057847" data-attributes="member: 369937"><p>This could be fixed with some small ferrite beads at the entrance to the centre conductor from the power supply, but that would mean opening it up to do their work for them.</p><p></p><p>Switching supplies are very very RF noisy, as most run around 200 KHz or so and have multiple harmonics that run right through most upper broadcast bands, that's why we never went to switching supplies in our TV and AM/FM stereo monitors, it would have been cheaper to do so, but the shielding and RFI suppression costs would counter the savings.</p><p></p><p>And by the looks of that PSU, it may be better to make your own, as I dont see any way to add shielding, if you do open it, can you post some photos.</p></blockquote><p></p>
[QUOTE="Terryl, post: 1057847, member: 369937"] This could be fixed with some small ferrite beads at the entrance to the centre conductor from the power supply, but that would mean opening it up to do their work for them. Switching supplies are very very RF noisy, as most run around 200 KHz or so and have multiple harmonics that run right through most upper broadcast bands, that's why we never went to switching supplies in our TV and AM/FM stereo monitors, it would have been cheaper to do so, but the shielding and RFI suppression costs would counter the savings. And by the looks of that PSU, it may be better to make your own, as I dont see any way to add shielding, if you do open it, can you post some photos. [/QUOTE]
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Terrestrial Broadcasting
Terrestrial Television, Digital and Analogue
Switch Mode Power Supply Woes - New Aerial/Mast head amplifier.
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