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"Dave M" wrote in message
news Meindert -- I generally agree with your statement regarding shields. The question I have, though, is as follows Given that the ground for an SSB antenna carries a lot of RF current, and given that all grounds end up tied together at some point aboard a vessel, by leaving the shields ungrounded at one end, isn't there a risk of creating a parasitic antenna out of your signal shields. As long as the indiviual runs of cable are shorter than 1/10 wavelength, they don't have any influence. You can break longer runs from an RF point of view by placing toroid cores every 1/10 wavelength and turn the cable a few times through these toroids. In such a case, grounding the shield at both ends is better, but should be done through a capacitor, to prevent any DC of low frequency currents from floating through the shield. The basic idea is that you prevent any current from flowing through the shield. Meindert |
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