Topband: : Cores on Beverage antennas.

[Mikek]

On 8/4/2018 5:53 PM, Mikek wrote:
> A good reference for Beverage antenna length is by W3LPL,  Search  
> online for his patterns, F/B    info.
>
> If a shorter Beverage wire length is used because of space 
> restrictions,    a near  perfect   feed and  restive termination can 
> appear as a low VSWR,  over a reasonable  frequency range.
> However  here in Maine,  the  ground is typically not close to level 
> in elevation , and  with   variations in soil conductivity,  resonant 
> lengths  are beneficial..
>
> One of the ways to make a wire look  electrically longer is the use of 
> covered wire. (Velocity factor that can vary with type of covering used).
> Also  some have  placed small lumped inducatances  along the way,,  
> Another used a slinky..
>
> Basic understanding about  cores  that most,  excepting mix 33, are 
> inductive,  So have a question for anyone who has tried it.
>
> Will adding many mix, 43, and 77   spaced  cores with a few turns 
> each  along the Beverage wire , lower the basic frequency enough to  
> be beneficial?
>
> ************************************************************************************************************************************************** 
>
>
>  I recently added 9 binocular cores (Fairrite # 2873000202) to my 
> 253ft BOG.
>  Before the Cores my velocity factor was .78
> After installing the cores the VF was .67
>  So, I'm thinking it made my antenna seem to be 16% longer, or went 
> from and apparent 324ft to 377ft.
>  I was shooting for .55 and will add more cores when I get them.
>  Even the the cores are binocular, I only made a single pass through 
> one hole of the core.
> That equals about 8.9uh.
> You probably have this URL, it is the only info I can find.
>> https://www.w8ji.com/slinky_and_loaded_beverages.htm
>
>           Mike Knowlton
>