To: | <topband@contesting.com> |
---|---|
Subject: | Topband: Vertical SWR Problems |
From: | "George & Marijke Guerin" <gmguerin@voyager.net> |
Date: | Thu, 2 Dec 2004 11:17:26 -0500 |
List-post: | <mailto:topband@contesting.com> |
Hi All, Let me address two issues. Ground effectiveness: To my ears the team vertical guys were not loud from 3D2XA. I believe Ken's note about only 2 radials is the issue. One needs to have a minimum of 30 radials each about 20 meters/66 feet or longer as a minimum unless one is on a saltwater flat. Some years ago a crew with a Battle Creek Special in central Oceana area only put out a few radials the first week and had a very poor signal. When they put out the rest of the radials they put out a decent signal and worked the entire North American continent and some Europe on their sunrise. For what it is worth, 32 radials 1/8 wavelength long is better than 16 radials 1/4 wavelength long, as the larger number of radials handles the near in return currents much better Base loaded verticals: As to base loading Titanex verticals, yes the antenna may have a 11 or 12 ohm feed point impedance, with a lot of capacitive reactance, but they supply and/or recommend a large inductor to base load the vertical up to 160 meters. Tapping the loading coil up some number of turns from the bottom/ground end will find a match close to 50 ohms for the coax cable feed line. 73 George K8GG
|
<Prev in Thread] | Current Thread | [Next in Thread> |
---|---|---|
|
Previous by Date: | Re: Topband: Vertical SWR problem, Ulrich Weiss |
---|---|
Next by Date: | Topband: HS72B, Paul Playford |
Previous by Thread: | Topband: Info from VK9XG, George Taft |
Next by Thread: | Re: Topband: Vertical SWR Problems, George & Marijke Guerin |
Indexes: | [Date] [Thread] [Top] [All Lists] |