-=> On -Mo-Se  97 21, Stan Black said to Ivy Iverson,<=-
-=>"About High Gain Antennas fo...,"<=-
 
Hi, Stan;
 
 SB> Couldn't you just add another colinear section and matching section
 SB> to the 10' antenna you have now to make it really kick?  Might take
 SB> enclosing it in some  pvc or something like that.  Just a thought!
 
Actually, I'm not too worried about the strength of the antenna, (why else
would I use the PVC?), it's made of 3/4 inch electrical conduit, however
the insulator between sections is a 3/4 inch dowel.  I have been unable to
find anything better.  I would like to find someone who has 1 In. diaameter
nylon rod and a lathe that could turn it down to my specs.  The phasing
stub is a hairpin made of #10 galvanized, threaded rod, so it would take a
pretty large pipe to contain it.
 
But my question was this: The bottom 5/8 section, (5/8 wave above the
matching section), is, according to the article, 3 dB gain, and adding
a second 5/8 and matching stub increases it another 3 dB to 6 dB.  I
would like to know _IF_ each additional 5/8 section and phasing stub
will add ANOTHER 3 dB: 3+3+3+3=12 dB, (actually a little less because of
losses), or if sucessive sections add less each time.  I would just LOVE
to get about 30-35 W ERP out of my little 5W HT, (and a booming half of
a KW effective when I can afford a more powerful mobile for the shack!)
IOW, if I added 2 more colinear sections, would the gain increase to
aproximately 12 dB, or would it be signifigantly less?
 
TNX ES 73 DE KB9QPM
   Ivy
 
 
 
... Double your dipoles. Double your flux.
 
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