[TowerTalk] Tips for Modelling swaged antenna tubing sections

[Mark - N5OT]

Back when I would model stuff all the time (K6STI's YO) I just put in 
the swaged parts as separate segments that were the correct diameter and 
length as the swaged parts. That does not really compensate for the tiny 
bit of transition from larger to smaller, but my segments were chosen 
arbitrarily to be halfway through that tiny bit of transition (i.e. the 
combined lengths added up to the actual phisical length of the HyGain 
part I was modeling.  I figured no matter how inaccurate my method was, 
it was still better than ignoring the swaged part altogether.

73 - Mark N5OT


On 9/29/2020 11:02 AM, jimlux wrote:
> On 9/29/20 8:52 AM, Charles Morrison wrote:
>> No. Outside.
>
> So you have a small bump in diameter. Model it as such. Add a short 1 
> segment wire that is the diameter of the swaged part.
> realistically, if it's a "tiny" part of a wavelength, it's not going 
> to make much difference.
>
>
>>
>> On Tue, Sep 29, 2020 at 11:49 AM jimlux <jimlux at earthlink.net 
>> <mailto:jimlux at earthlink.net>> wrote:
>>
>>     On 9/29/20 8:31 AM, Charles Morrison wrote:
>>      > Is there an accepted reduction percentage that is used ?
>>      >    How do you model the swaged portion of tubing ?
>>      >
>>      > The published HyGain models do not account for it in a separate
>>     tubing
>>      > section, so no hints there.
>>
>>     Isn't the shrunkdown part inside another element? If so, it's not in
>>     the
>>     circuit.
>>
>>
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