[600MRG] TNX for Replies, Ending Thread - RF Ammeter Placement and Antenna Feedpoint Location

[Gedas]

ok so is it safe for me to summarize it this way.....unless one can 
accurately measure all of the other "collective losses" there does not 
seem to be a practical method available for physically measuring R(rad) 
without supplemental data from models of the antenna.

Gedas, W8BYA

Gallery at http://w8bya.com
Light travels faster than sound....
This is why some people appear bright until you hear them speak.

On 3/12/2018 6:11 PM, Eric NO3M wrote:
> The "measured" value using an analyzer into the unmatched end of the 
> loading circuit will include all collective losses + R(rad), which is 
> useful for calculating the efficiency.  Determining R(rad) itself 
> using a reasonably accurate model is still the most practical method 
> as Ed mentions.  There are other tools like spreadsheets and online 
> calculators floating around that can come close if the antenna is 
> generic (ie. flat-top loaded monopole).  I don't think these alternate 
> methods handle situations like sloped top loading.
>
> 73 Eric NO3M
>
>
> On 03/12/2018 05:42 PM, Gedas wrote:
>>
>> Hi Ed, so good to hear from you again ! I chose my words very 
>> carefully. Eric used the term Measured and that is what I wanted to 
>> learn more about. I use and enjoy modeling and know of several 
>> calculated approaches to arrived at the value. But again, that word 
>> "measured" got my attn. and was wondering if he would be willing to 
>> share any practical approaches at arriving at a value of R(rad)...73
>>
>> Gedas, W8BYA
>>
>>
>
>
>
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