Rockinghorse Winner wrote:
I was checking the lengths for a 15 M dipole up 18 feet and the EZNEC
calculated length was about 10% longer than using 468/F. I was wondering if
the EZNEC calculation takes other factors into consideration and what these
may be? Thanks alot.




CUL8R



R*Horse





"Take a look behind you - upstream - now you begin to
recognize this country, don't you?"

"Yes, I do recognize it now. It is the most wonderful
thing I ever heard of; by a long shot the most
wonderful - and unexpected."

Mark Twain
Life on the Mississippi



http://rwinner.blogspot.com
Hi RH, The proximity to ground, the ground type, and the length will
be the factors that determine the source impedance of the dipole. I
just ran a dipole cut for 21.3 Mhz by the formula, 18' up over real
ground and found it to be off by 3%. Moved it up to 36' and it was off
by 1%. Your 10% sounds a bit high. The conductor size of a wire
dipole will have some effect at 15m, but I did not try anything
different than #12 wire.
Gary N4AST