Thursday, December 17, 2009

eznec maps

I'm in the process of brainstorming some antenna changes. Given my lot size I can do 2 x 77 ft verticals spaced 85 ft apart with the axis parallel to the road I live on. The road I live on is at a 15 deg offset south of E-W, so I wanted to be able to see where I would cover on each band 160 80 and 40.

I have a multiband 2 el phasing harness from Array Solutions.


This is a clever solution by W9AD that allows phasing by switching in various coaxial delay lines and a lumped 180 deg element. By judicious choice of line length you can acheive all kinds of possibilities. Here are the possibilities for my proposed 160 80 40 array:
-------------------------------------------------------------------------------

40M 77ft vert 85ft separation zero deg phase 15 deg offset for Burkholm Road 5.2 dB gain

This is a Map centered on my QTH to help judge coverage:




40M 77ft vert 85 ft sep 180 deg phase 15deg offset

These are the only 2 useful choices for 40M


80M 77ft vert 85ft sep 0 phase 15 deg offset for burkholm




80M 77ft vert 85ft sep 180 deg phase 15 deg offset for Burkholm


80M 77ft vert 85ft sep 90 deg phase 15 deg offset for Burkholm



80M 77ft vert 85ft sep 270 deg phase 15deg offset for Burkholm

These are the only useful modes for 80M


160M 77ft vert, 85ft sep 0 deg phase 15 deg offset for Burkholm





160M 77ft vert 85ft sep 180 deg phase 15 deg offset for Burkholm


160M 77ft vert 85ft sep 135 deg phase 15 deg offset for Burkholm


160M 77ft vert 85 ft sep 225 deg phase 15 deg offset for Burkholm

Good F/B and a little to a lot of gain depending on solution. I should be able to make this array band following. Not as good as dedicated 4 squares but my property is just not big enough for that

73