[Antennaware] Help with Short Dipole

[Gedas]

Hi Guy. ok now that I have an initial model built correctly I can 
proceed with my experimentation. You had asked "The next question, what 
are you trying to accomplish with this? You wanting to put this in the 
air? Coming up with the coils will be interesting. 1265 ohms X is a lot 
of wire turns." The simple answer is pure fun mixed with a little science.

In reality I have the property to make a full sized inv-v type dipole 
for this frequency and suspend it from 85' but I realize even this would 
be a pure cloud warmer as the antenna is kissing the ground. Your 
analogy of the 40m antenna is spot on. But I could eliminate the 
inductors completely if I wanted to. I am doing this out of curiosity. I 
like to see how reality differs from different models using different 
models.

Ok, so getting back to this antenna.....I already have the 160m dipole 
up in the air operating and it is purely curiosity driving me to try 
this antenna. I know with 100% certainty that I will be going with a 
vertical radiator fed against some sort of ground but given I like to 
play with antennas, in particular model them, build them, and actually 
put them on the air this is only for my personal gratification and my 
own curiosity.

I should note that the values of "R" for the inductors in my model were 
100% guesses on my part before I did any calculations. That was going to 
be my next question to you. I was wondering if a half-way accurate 
number for the resistive component could be obtained before the 
inductors built and measured. I do own a VNA (actually an ENA) from 
Agilent that may help me get an accurate number but I am wondering how 
accurate the number would be based on the predicted Q from some of the 
better Inductor Calculator programs out there.

I have just run several calculations to make a large inductor using a 
4.5" dia form and if one can trust the predicted Q at this frequency to 
be around 400 is it safe to initially use a value of 3.2 ohms for R?

I will of course measure it with the VNA to see how close this number is 
but is this the value for R that I would use (R derived from XL/Q) ?

Gedas, W8BYA

Gallery at http://w8bya.com
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