Re(3): [Antennas] High Take-off Angle of 1/4 wave Vertical??

Thu Mar 24 14:11:27 EST 2005

k6mhe at arrl.net writes:
>At 08:50 PM 3/23/2005, David wrote:
>>>Yes, a mobile/portable situation, and thinking perhaps I am not getting
>lo
>>angles because of poor radials or poor grounding
>>The reduction of lower angle radiation (for less than 5/8-wavelength 
>vertical) is caused by a poor location!
>>A vertical with a poor radial ground system over sea water will have a 
>lower takeoff angle that a vertical with an excellent radial ground
>system 
>over dry desert land.
>>>73,
>Danny, K6MHE

OK, Danny... you are right. We are not fully communicating.
I somewhat understand the radials and take-off angle, so forget the
radials for the moment.
I had that second question then. I'll rephrase it two ways: 
1) What happens, if anything, to the take-off angle if a poor RF ground
occurs with a vertical feedpoint?
2) Say I am feeding a vertical directly with a RG-8 coax, ...all else
aside, does anything happen to the take-off angle if I put a high RF
resistance (say, 30 - 1000 ohms) between the coax sheild and the normal
physical "ground" point at the vertical's feedpoint?
NOTE: This resistance I talk about for this new discussion could be a 
simulation of a "bad RF ground" connection either to the radial system,
...or to the vehicle in a mobile situation. Do you see what I'm getting at?
David
w7dbh