[WVDXA] Question of the day

[Greg Lee]

Hi Don,
  Thanks for the reply. to answer one of your questions. the manufactuer  recomends using a 4 to 1 balun made by array solutions to feed the  smaller vertical, monted at the base.....not sure but think the bigger  one is the same.....i'm going to call them and find out a few things so  will know more later....Greg
  
W8DL at aol.com wrote:          Greg
   
  Two questions.
   
  (1) first how many and how log should the radials be ? First no matter the   length the more the better. That was easy. Second Ideally the radials should be   about 10 percent longer than a quarter wave ( approx 70 feet for an 80   meter vertical. ) NOTE: if you don't have room for 70 ft radials it is better to   install lots of shorter ones. I have two 65 ft verticals I use on 80 and 40   meters. Each vertical has 64 radials that are 70 feet long.
  I use matching networks at the base of each vertical and feed them as 1/4   wave verticals on 80 meters and 1/2 wave verticals on 40 meters
   
  (2) Which vertical will work best on 160 ? since both the 65 ft and 53   ft vertical are both much shorted than the size of a full quarter wave on   160 meters the answer as to which will be the most effective on 160 meters   is dependent upon HOW they are loaded ( Top , Mid, or Base ). All other things   being equal If done properly the top loaded vertical will be more effective. So   if the 53 foot vert is a top loaded design it would probably be more effective   than a 65 foot vert with base loading. There are many other things that   affect the losses in an antenna, such as the "Q" of the loading   system. So just to choose from the length alone is not a good plan,.   You must know all the other factors.
   
  The above assumes ground mounted verticals with the radials   either on the ground surface or buried a few inches
   
  I hope this helps
   
  73's  Don W8DL
   
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73,
GREG LEE, W8GG  
15290 HANNAN TRACE ROAD  
CROWN CITY, OHIO 45623  
  
PHONE: 740-256-1181  


 
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