[TowerTalk] Verticle Antenna Question

[David Jordan]

Its not just for safety.  Typically, a 1/4 vertical over a reasonable 
radial system will have a low input impedance of about 25-30 ohms.  The 
coil shunted across the input raises the input impedance to match the 52 
ohm coax.

I used #12 vinyl coated house wire wrapped around a broom handle to 
create the form.  Then just prunned it a turn at a time till I got a 
nice match in the middle of the band.

Go for it,
dave
wa3gin

Lee Buller wrote:

>Liberal Arts Major type of question.....
>
>On some verticle antennas (i.e. Butternut) there is a
>coil between the feed point and ground.  The coil is
>about 1 1/2" in diameter and about 10 to 12 turns.  I
>think it is used for a DC ground return for
>lightening.  Then again....I may be wrong.
>
>If I was to fabricate my own 1/4 wave verticle...is
>such a thing needed for safety since my verticle I am
>planning does not have an actual ground-ground...but a
>ground plane instead.  I would say the the antenna is
>going to be a 1/4 wave ground plane.
>
>Lee - K0WA
>
>
>In our day and age it seems that Common Sense is in short supply.  If you don't have any Common Sense - get some and use it.  If you can't find any common sense, ask for help from somebody who has some common sense.
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