[HCARC] January 2015 QST

[Kerry Sandstrom]

Gary,

If you look at the blue curve which is the curve generated using the 
higher accuracy model for ground,  there is about 1 dB difference 
between an antenna at 40 ft and one at 25 ft.  The curve is actually 
fairly broad.  The dielectric constant for our area is 8 but I don't 
know the conductivity off hand.  Using the Army-type NVIS antenna in an 
inverted V arrangement, I don't see a tower is needed at all.  A single 
25 ft pole should be more than adequate.  Yes, Dale's broadband 80 meter 
dipoles should work fine.

Kerry



Interesting - that 40-60 feet gives the best cloud warming effect vs 
cost. Of course here in South Texas even the 40-60 foot elevation is a 
myth for most Hams, mobile or otherwise.  I think we are needing to 
build a couple more of the tower trailers the club owns.  That would get 
us up to the 40-50 foot level if 2 of them were positioned to run one of 
Dale's broadband 80 meter dipoles between.  To that effect, Gordon Green 
has the club trailer at his qth looking how to redesign it to be slide 
onto a 16 foot flatbed trailer.  He and I will publish the results of 
the design changing.  Then all we need is another couple to put at the 
Red Cross to support another 80 meter dipole there.

Gary J
N5BAA