Topband: [TowerTalk] Feed Point Choke Question

[Artek Manuals]

Jim

Not asking anyone to debate anything... Just asking for real world 
physical measurement that the difference in this particular case is 
measurable and significant

I am from Missouri ( really) ...show me

Dave
NR1DX

On 11/7/2020 1:56 PM, Jim Brown wrote:
> I will not be drawn into debates about scientific concepts that have 
> long been well understood.
>
> 73, Jim K9YC
>
> On 11/6/2020 12:58 PM, Artek Manuals wrote:
>> 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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>>
>
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-- 
Dave Manuals at ArtekManuals.com www.ArtekManuals.com


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