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Thanks, Joanne!! You nailed it ! ! ! ! When it comes to RF, there is NO GROUND. However, there is a 'return' for RF fields. I often point out that the Crab Nebula doesn't need a 'ground' to fill the known universe with copious amounts of RF energy. The ISS doesn't need a 'ground' to communicate with earth from LEO. Our Voyager probes which have left the influence of our Sun don't need 'ground' to communicate with the big dishes on earth. Communications through amateur repeaters using hanke-talkies doesn't require a 'ground'. Someday, maybe, just maybe, before I push up daisies, people will realize 'ground' isn't what they envision it is. Grounding or earthing for safety is quite well founded in sound theory and engineering practices. However, 'grounding' to alleviate 'RF in the shack' is quite bogus in both theory and good engineering practices. The latest ARRL publication titled "Grounding and Bonding for the Radio Amateur" finally got it correct after decades of bad information from that organization regarding the subject. I STRONGLY recommend it to anyone having trouble with the subject. The Brits got it right: they 'earth' for safety, NOT for RF RETURN. How can we ever, in our life times, get this fact across???????
Dave - WØLEV
On Fri, Nov 17, 2017 at 5:19 PM, jdow <jdow@...> wrote:
There is another site worth consulting once you discuss audio. Go find Jim Brown's, K9YC, fine set of articles. (Conveniently it's at "http://k9yc.com/".) Jim Brown is a retired professional theater audio fellow. One of his main gigs was a theater in the same building in Chicago as a large bunch of high power TV transmitters. Perforce he learned how to properly handle audio in a high RF environment where even 60 Hz hum is a severe enemy.
Dave - WØLEVJust Let Darwin Work