[Antennas] Wire Antenna Questions/Opinions

2002年11月06日 09:36:29 -0800

Good Morning,
	Now, between questions and opinions, there has to be something in 
this one for everyone :)
	I've just about finalized my ideas for the two wire antennas I will 
put up hopefully before the end of the year (unless the rainy season 
comes early). Before I start scrounging up materials and lining up 
help for the TV mast party, I thought I'd briefly describe what I 
want to do and solicit your comments and opinions. I have a specific 
question or two about one of the antennas that involves a choice in 
placement, so hopefully I can get a good answer or two on that. 
	The first one, whose configuration is pretty much set, is a tilted 
delta loop of about 350 feet of 12 AWG in roughly an equilateral 
shape with the point up. It will be fed from a lower corner with 
open wire line to a air core choke balun, then into the shack 
through an SPC type of transmatch. The apex will be about 65-70 feet 
high with the base between 10 and 15 feet above the ground. It will 
be oriented broadside N/S. Its support by the way is a 50 foot TV 
mast on the roof, with non-metallic guys except on the lowest ring. 
I had excellent results with a very similar antenna about 2/3'rds 
this size, but with the base even lower...about 6-8 feel in that 
case..so I'm hopeful about his one. I would enjoy any and all 
comments, suggestions and discussion on this one 
	The second one has a choice to be made before I finalize its 
configuration. In any case, it will be a simple dipole, 12 AWG, 
center fed with open wire line through a coaxial choke balun to the 
shack and an SPC design transmatch. It will also be oriented 
broadside N/S (no real choice on either orientation).
	Option A has a length of about 100 feet and both ends at about 50 
feet above the ground, i.e. essentially a level flat top.
	Option B has a length of between 125 and 130 feet, one end at the 
same 50 feet, but the eastern end will be about 15' above the 
ground..i.e. a sloper. 
	I'd be particularly interested in how the two options might compare 
on the lower bands (80/40). On one hand I can have the height for 
the whole length, but only 100 feet, the other has more length but a 
lot closer to the ground on one end. Comments?
		Thanks for your time. Please feel free to email direct since I 
receive the list in digest form. 
		Dennis
	-----------------
"If you can remain calm, you just don't have all the facts"
Dennis Wade
KG6ZI
Carmichael, CA