[Antennas] Krazy Antenna Idea

2002年5月01日 17:14:36 -0700

Sorry, Mark, I sorta don't understand what the heck youare saying.
George said put it on the ground and forget about the elevated carport.
I have abit of land N of the carport to do such, but that is the back 
lawn. So it might come down to the best of what is available.
Chris opr VE7HCB
At 03:42 PM 2002年05月01日 -0700, Mark wrote:
>Ahh .. finally .. the Empower has no clothes Thanks, George .. that is such
>a neatly written response I have seen hams waller around trying to get
>their ground mounted / ground buried radials laid out to "resonant"
>frequency .. HAR .. t'ain't there, when you lay that waarrr on/in the
>ground! Unless you are laying on silica (sand), and, note even then, ain't
>resonant!!!! Now, not to say a 2 foot radial will work like a 65 foot
>radial on 75 meters, BUT .......... 73, Mark .. retired broadcast
>engineer .. AA6DX
>----- Original Message -----
>From: "George, W5YR" <[email protected]>
>To: "Chris BONDE" <[email protected]>
>Cc: <[email protected]>
>Sent: Wednesday, May 01, 2002 2:37 PM
>Subject: Re: [Antennas] Krazy Antenna Idea
>>> > Radials that are in contact with the ground are detuned by the ground and
> > need not be resonant. They are there to collect return currents within
> > about 1/4-wavelength of the base of the antenna. Length is not critical -
> > the more the better.
> >
> > Radials that are elevated need to be resonant to be effective. That means
> > that their length is critical as are their surroundings. They cannot lay
>on
> > something like a carport roof that would detune them. They cannot be
> > connected to ground or anything except an insulator at the far end. Snow
> > will probably detune the radials, perhaps substantially.
> >
> > A radial that starts out in the air, runs along a roof and then dives down
> > to be connected to ground is not really a radial but an extended "ground"
> > wire that is too long to have much effect.
> >
> > I see little need to elevate the antenna for 160. Put it on the ground and
> > put out as many radials as you can of whatever lengths you can fit into
>the
> > property. More shorter radials are better than fewer longer radials. Snow
> > will have little effect.
> >
> > I would forget about the carport . . .
> >
> > 73/72/oo, George W5YR - the Yellow Rose of Texas
> > Fairview, TX 30 mi NE of Dallas in Collin county EM13qe
> > Amateur Radio W5YR, in the 56th year and it just keeps getting better!
> > QRP-L 1373 NETXQRP 6 SOC 262 COG 8 FPQRP 404 TEN-X 11771 I-LINK 11735
> > Icom IC-756PRO #02121 Kachina 505 DSP #91900556 Icom IC-765 #02437
> >
> >
> > Chris BONDE wrote:
> > >
> > > I have been planning on being on 160m. The upper portion, say 1850 to
>1975.
> > > I have a carport that runs E-W, that is the length, the mountain to the
>N
> > > fairly well prohibits propagation that way.
> > >
> > > If I mount a vertical on the N side of the carport, run the radials E-W
>on
> > > the N edge, S-E and S-W to the diagonal corners, and, S on the width,
>with
> > > possibly, the radials from the N wrapping along the edge to join the
> > > diagonals which could go to the ground and be grounded, along with the
> > > width N-S going to ground over the edge. This is the first question how
> > > would that work for the radial system? How would the snow on the roof
>of
> > > the car port, up to 4ft deep, dry and wet, influence the radials plus
>the
> > > antenna. Now that is something else.
> > >
> > > __________________O________________________
> > > ! / |
> > > \ |
> > > | / | \
> > > |
> > > etc
> > > Any comments on this radial system?
> > >
> > > Chris opr VE7HCB
> > - - -
> >
> > Your moderator for this list is:
> > Larry Wilson KE1HZ [email protected]
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