One can see the answers to most of these questions in
the picture here:
http://tf.nist.gov/timefreq/images/radiostations/wwvh-large/wwvh5.jpg
All of the verticals are similar in construction ... note the on
ground radials are clearly visible below both antennas in the
array.
The use of radials to reduce ground losses with 1/2 wave verticals
is independent of feed method (base vs. elevated vs. off center) and
feed impedance (only effects matching method - not ground losses).
73,
... Joe, W4TV
> -----Original Message-----
> From: towertalk-bounces@contesting.com
> [mailto:towertalk-bounces@contesting.com] On Behalf Of Bill Aycock
> Sent: Monday, April 06, 2009 9:37 AM
> To: Michael Tope; N7mal
> Cc: towertalk@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?
> 2. what is the feed point impedance?
> 3. Are the lower ends of the "guys" grounded?
> 4. Why is it important that the Coax feeds do not cross?
> 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@dellroy.com>
> To: "N7mal" <n7mal@citlink.net>
> >
> >>----- Original Message -----
> >>From: N7mal
> >>To: John Geiger ; towertalk@contesting.com
> >>>>
> > WWV uses 1/2 wave verticals:
> >
> > http://tf.nist.gov/timefreq/stations/wwv.html
> >
> >
>
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|
