Topband: Homebrew capacitors

[Bill Cromwell]

Hi Jim,

When I used it I connected the center conductor at one end and the braid 
at the other end. The bit that I used for the small coupling capacitance 
was not very long. Even the short length I used kept the output of one 
circuit further away from the input of the other circuit.

Some antenna circuits use them by connecting one leg of the antenna to 
the center conductor and the shield at the same end to the next leg of 
the antenna. I believe I am thinking of a trap that was tuned this way. 
The coax was the resonating capacitance for the trap and the open end 
could be trimmed to resonance, sealed against the weather and then - 
rolled up conveniently. I did not build that circuit but have kept it in 
mind as a possibility. It probably depends more on what is convenient.

73,

Bill  KU8H


On 09/29/2013 07:42 PM, Jim GM wrote:
> Could have saved more money with a Piece of RF-9913 or RG8 coax cable about
> 25pF per foot plenty voltage rating.
>
>
> Only thing can some one please help me on this, do I connect the center
> conductor on one end of the cable and use the shield on the other end? Or
> just use the  center conductor and shield on one end, while the other end
> are floating not used and not tied together?
> Diagram below 0= connection point.
>
>       ________________________________0
>
>       ________________________________0
>
> OR
>
>       0________________________________
>        _________________________________0
>
>
> Jim K9TF
>