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![]() "Steve N." wrote in message ... snip Another concern (though I have no experience with roofs, just autos) is the intermitent contact (as opposed to a rectifying junction, as Richard points out) that is possible. If there are joints that can make and break, say in the wind, you may have noise generated. Chain-link fences would be susceptable to this as well. Wether or not it produces noise in your receiver, I would think, is rather unlikely, unless you were somewhere near a broadcast station or another ham for reasons described next. It's mostly a problem if you are running two or more rigs at the same time. Your 2M packet rig could interfere with your 2M ragchew. The Navy, for whom I work, bonds (or isolates) everything topside for exactly the reason you stated. The intermittent contacts are noise generators. The tools for detecting some troublesome items are a rubber mallet and a pair of handhelds. One guy in radio transmits a carrier, while listening on a nearby freq. If he hears anything, he grabs his handheld and barks, "What was that you just tapped on?" Primitive but functional. Every spark, no matter how small, is an RF generator. Chains are awful. We hate chains. |
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