Topband: Elementary Inverted L questions

[Artek Manuals]

Technically the insulation should electrically lengthen the antenna 
about 1.5-2 % (lower the frequency)

As Wes said the dimensions would be helpful. is the flat op horizontal 
or does it slope down if it slopes how low is the far end?

I dont think 17 turns of RG400 is doing much for you on 160M but with a 
ground mounted radials (IMO) not likely needed...what is the "R" at X=0.

�Are you measuring R+jX at the antenna or at the shack end of the coax? 
How long is the coax

Dave
NR1DX



On 3/25/2021 11:54 AM, Wes wrote:
> How long is the vertical section?� The insulation should have minimal 
> effect.
>
> Wes� N7WS
>
>
> On 3/25/2021 8:07 AM, N4ZR wrote:
>> I have been trying to replace my inverted L, which broke a few weeks 
>> ago, and am having all sorts of puzzlements. Please be kind - I was a 
>> history major.
>>
>> 1.� The inverted L broke at the turn, so I went looking for sturdier 
>> wire.� I wound up with some #14 insulated recommended by our local RF 
>> maven, and put up 140 feet initially, figuring I would prune it *up* 
>> into the CW part of the band.� Imagine my surprise when it showed up 
>> resonating at 1977 KHz (on an AA-55 Zoom).� Does insulation have such 
>> a profound effect on velocity factor?
>>
>> 2.� My feedpoint arrangement has 17 turns of RG-400 as a common mode 
>> choke, with the radial field connected to the RG-400 shield at the 
>> antenna end.� Initially I tried measuring the resonance without the 
>> radial connection.� No resonance and infinite SWR. I connected the 
>> radial field (8 X 70-foot radials on the ground) and that's when I 
>> saw the 1977 KHz resonance (X crossing zero). SWR at minimum was 
>> above 2:1.� Does this make sense?� I know the radial field is 
>> inadequate for good performance, but...
>>
>
> _________________
> Searchable Archives: http://www.contesting.com/_topband - Topband 
> Reflector

-- 
Dave Manuals at ArtekManuals.com www.ArtekManuals.com


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