[TowerTalk] Vertical vs Beam

[Jim Hargrave]

Bill,

I have used this type antenna for several years. It is a very common VHF/UHF
antenna because of its simplicity. It makes a great 17 meter antenna and is
easy to construct without a lot of real estate.

I offer further comment embedded below:

   >-----Original Message-----
   >From: towertalk-bounces at contesting.com
   >[mailto:towertalk-bounces at contesting.com]On Behalf Of Bill Aycock
   >Sent: Monday, April 06, 2009 13:37
   >To: Michael Tope; N7mal
   >Cc: towertalk at contesting.com; John Geiger; Robert Redmon
   >Subject: Re: [TowerTalk] Vertical vs Beam
   >
   >
   >As far as the subject of 1/2 wave verticals goes, the WWV site
   >leaves out a
   >LOT!
   >1. Where is the feed point?

Feed point is at the top of the skirt and the base of the 1/4 wave vertical
on top.
Coax shield to skirt and center to top vertical.

   >2.  what is the feed point impedance?

Nominal 50 ohm. This is accomplished by the angle of the skirt to the driven
element.

   >3.  Are the lower ends of the "guys" grounded?

Nope. They should have insulators at the 1/4 wave point. The more skirt
wires you install the more uniform the radiation pattern.

   >4. Why is it important that the Coax feeds do not cross?

Good question. That one is above my pay grade.

   * 73's Jim W5IFP *


   >Does anyone know?
   >Are the arrangements of the TTers with 1/2 wave verticals like
   >WWV, and if
   >not, why reference it?
   >Bill--W4BSG
   >
   >
   >    ----- Original Message -----
   >From: "Michael Tope" <W4EF at dellroy.com>
   >To: "N7mal" <n7mal at citlink.net>
   >>
   >>>----- Original Message -----
   >>>From: N7mal
   >>>To: John Geiger ; towertalk at contesting.com
   >>>>>
   >> WWV uses 1/2 wave verticals:
   >>
   >> http://tf.nist.gov/timefreq/stations/wwv.html
   >>
   >>
   >
   >
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