Xref: utzoo rec.radio.shortwave:4710 rec.ham-radio:29153 sci.electronics:16650 Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!csus.edu!ucdavis!csusac!sactoh0!jre From: jre@sactoh0.SAC.CA.US (Jim Earl) Newsgroups: rec.radio.shortwave,rec.ham-radio,sci.electronics Subject: Re: Ground Plane for my CB antenna Summary: Possible correction... Message-ID: <4576@sactoh0.SAC.CA.US> Date: 3 Jan 91 22:53:03 GMT References: <1990Dec31.232808.18508@athena.cs.uga.edu> <1991Jan3.140815.20900@cbnewsl.att.com> Organization: Sacramento Public Access, Ca. USA Lines: 25 In article <1991Jan3.140815.20900@cbnewsl.att.com>, feg@moss.ATT.COM (Forrest Gehrke,2C-119,7239,ATTBL) writes: [some stuff deleted] > BTW, the proper configuration is an upright quarter wave element > and quarter wave length radials. Since in this case the radials > are tuned, they must be exactly quarter wave length. > > Forrest Gehrke feg@dodger.att.com k2bt I believe that the statement about the radials being the same length as the vertical element is incorrect. The ground radials should be 10% *longer* than the vertical element. If you are building a 1/4-wave ground plane for 27 mHz, the length of the vertical element should be around 108". That makes the radials come in around 119". I'm no expert, but that is what I seem to remember reading about them. I also seem to remember something about making sure the radials are "drooping" at a 45-degree angle, because that makes the ground plane closer to the desired 50-ohm impedance. -- Jim Earl - KB6KCP / home: (916) 729-6825 work: (916) 929-0300 x233 INTERNET: jre@sactoh0.SAC.CA.US UUCP: {ames | apple | att | sun}!pacbell!sactoh0!jre or: ucbvax!csusac!sactoh0!jre