[TowerTalk] Feed Point Choke Question

[Artek Manuals]

Jim

Show me the ACTUAL antenna range pattern measurement data  with and 
without the common mode choke on a a similar antenna, with a reasonable 
SWR ( LESS THAN 1.5:1)  and the feed line has been brought down 
perpendicular to the plane of the antenna and I will concede you the point

Dave
NR1DX


On 11/6/2020 3:37 PM, Jim Brown wrote:
> On 11/6/2020 12:28 PM, Artek Manuals wrote:
>> The short answer is how tight you make the turns will have little 
>> real world effect. 
>
> That short answer is WRONG.
>
> Use the RG-8X I would probably use the #31 core over the
>> 43 . The poor mans 8 turns of coax 4-5" in diameter without ferrites 
>> will probably actually work as well. 
>
> Define "work." The important thing a choke should do is kill common 
> mode current on the feedline that couples noise to the antenna and 
> fills in nulls in the antenna's pattern. That "poor man's" solution 
> won't do much for that. If "work" means it won't overheat, yes, it 
> would "work."
>
>> Depending on SWR and feed line dressing (always perpendicular to the 
>> plane of the beam the need for choke at all� is arguable
>
> It's arguable only if you don't understand the problem, or don't care 
> about noise or the antenna's nulls.
>
> 73, Jim K9YC
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-- 
Dave Manuals at ArtekManuals.com www.ArtekManuals.com


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