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#1
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Buck wrote:
Today I see a lot of antennas preferring above ground radials. Maybe decoupling the radials from ground lowers ground losses? :-) -- 73, Cecil http://www.qsl.net/w5dxp ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= East/West-Coast Server Farms - Total Privacy via Encryption =--- |
#2
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On Mon, 07 Feb 2005 08:40:51 -0600, Cecil Moore
wrote: Buck wrote: Today I see a lot of antennas preferring above ground radials. Maybe decoupling the radials from ground lowers ground losses? :-) There have been a number of changes in technology theory in the last 30 or so years. When I was a Novice, the vertical antenna manufacturers provided information about how to use above-ground radials, but that was typically for a raised antenna such as roof mounting it. IIRC, the above ground Hustler 4BTV and the Taylor antennas both had to be lengthened a little to be resonant in the same place as the ground mount and radials had to be tuned. Reports at that time were that antenna efficiency was best when the antenna was ground mounted and had 8-16 radials buried. However, while not optimum, the minimum ground was to be an 8-foot ground rod at the base of the antenna. Baluns seemed to be a new technology, I don't recall the term "ferrite beads", and RF in the shack wasn't a big issue. One common practice was having a ground rod as close to your rig as possible and making sure the rig, PS, antenna and everything electrical near the rig was grounded to the ground rod. Today the electrical code for homes forbids that due to ground-loops. Some of these changes take some getting used to. It's a strange feeling to realize that what you knew for so long is no longer true. -- 73 for now Buck N4PGW |
#3
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Buck wrote:
Some of these changes take some getting used to. It's a strange feeling to realize that what you knew for so long is no longer true. Think about what will be accepted as being true after someone figures out how to demodulate entangled particle beams. -- 73, Cecil http://www.qsl.net/w5dxp ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= East/West-Coast Server Farms - Total Privacy via Encryption =--- |
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