[Antennaware] Very Low Dipole Radiation Resistance

[Gedas]

Right. I.e., in my case since we are talking about a short 600' inv-v 
antenna on 630m at 85' I get a calculated value for R(rad) of about 0.66 
ohms.

If I raise this perfect antenna model to approx 1/2-wave above a perfect 
ground I get ~16 ohms and at 1-wavelength above perfect ground ~17.3 ohms.

My goal is to arrive at a somewhat accurate number for EIRP to ensure I 
am compliant with FCC requirements.

I think I have two choices:

1. Should I trust EZNEC and return my ground type to real, add back in 
all my wire losses, and losses in my inductors etc and trust the 
finished dBi gain value provided by the program?

2. Or should I or do I need to install the finished antenna at height 
with all it's inductors and ohmic losses etc and try to make 
measurements of the antenna voltages and currents at the feedpoint in an 
attempt to calculate R(loss) ? I realize I will have to carefully take 
into account the impedance transformation due to the coax feeding the 
antenna since my measurements will be in the shack and not up on the 
tower top.

Opinions or experiences anyone want to share?

Gedas, W8BYA

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On 3/17/2019 12:23 PM, Edward Mccann wrote:
> Noting that the Rr varies as a function of height above ground.
>
> AG6CX
>
> Sent from my iPhone
>
>> On Mar 17, 2019, at 7:38 AM, Dave Cuthbert <telegrapher9 at gmail.com> wrote:
>>
>> Gedas,
>>
>> you are correct. The reported resistive part of the input impedance is the
>> short dipole is the radiation resistance.
>>
>>    Dave KH6AQ, formerly WX7G
>>