: elecraft@mailman.qth.net
Subject: Re: [Elecraft] OT- Radials for Vertical Antenna
Elevated radials are better than buried, but more radials are better than a few
or none. A good minimum number (for each band) would be 8.
Many studies on this have shown many more than 8 per band (like 25) is much
12:33 PM
To: Randy Cook
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] OT- Radials for Vertical Antenna
Elevated radials are better than buried, but more radials are better than a
few or none. A good minimum number (for each band) would be 8.
Many studies on this have shown many more than 8
; elecraft@mailman.qth.net
Sent: Tuesday, July 2, 2013 8:17 AM
Subject: Re: [Elecraft] OT- Radials for Vertical Antenna
Actually, I don't think we're disagreeing. But if so, point(s) taken.
I didn't mention that elevated radials shouldn't be used with a ground
mounted vertical (I wouldn't try
I would appreciate any help from the group on my unusual antenna situation. Not
really Elecraft related, so OK to respond off line.
Recently, we had to gut our back yard, as several Redwood trees were
undermining a retaining wall. Bad situation. So, the trees had to go, and with
them my
Randy,
Also a CA ham, but a bit to the east of you, up here in Folsom. We've got
several redwoods and they serve me well for an 88 foot doublet at 45 feet, and
two Inverted L's - one for 80 and one for 160. However, I use the K3's
diversity receive a LOT and for my other antenna, I have a
band(s) do you want to operate? If 20 meters, you might consider an end
fed half wave vertical that would not need much ground system.
73 - Mike WA8BXN
---Original Message---
From: Randy Cook
Date: 07/01/13 12:30:28
To: elecraft@mailman.qth.net
Subject: [Elecraft] OT- Radials
Elevated radials are better than buried, but more radials are better
than a few or none. A good minimum number (for each band) would be 8.
Many studies on this have shown many more than 8 per band (like 25)
is much better and, of course, much harder and expensive to field.
I have a 33' vertical
Hi Randy,
I have plotted several of the ground radial count versus loss studies.
http://www.kn5l.net/GroundRadialStudy/#figure2
A plot of minimum radial length versus number of radials is:
http://www.kn5l.net/GroundRadialStudy/#figure4
The above may help you with your antenna selection.
John
Mike WA8BXN wrote
I think elevated radials need to be tuned, that is a particular length for
a
given band. If you will be operating multiple bands, a set is needed for
each band.
If elevated radials are not tuned and not quarter wave, the efficiency may
be even higher than with quarter wave
All of the no radial verticals that I've seen are electrically 1/2
wavelength long and so behave as an end-fed dipole. Since the feed point
impedance is very high, there is very little current flowing and so a ground
connection has relatively little impact on the efficiency.
Another great
Elevated radials need not be tuned (whatever matching network is used
should resolve the tuning, BUT if the radials are to be effective in
cancelling the horizontally polarized radiation, pairs must be arranged
180 degrees apart. Yes, they can bend, but will be most effective if
the bends are
might consider an end
fed half wave vertical that would not need much ground system.
73 - Mike WA8BXN
---Original Message---
From: Randy Cook
Date: 07/01/13 12:30:28
To: elecraft@mailman.qth.net
Subject: [Elecraft] OT- Radials for Vertical Antenna
I would appreciate any help
Consider the OCF vertical dipole.
Mel
From: Ron D'Eau Claire r...@cobi.biz
To: elecraft@mailman.qth.net
Sent: Monday, July 1, 2013 2:24 PM
Subject: Re: [Elecraft] OT- Radials for Vertical Antenna
All of the no radial verticals that I've seen
, July 01, 2013 3:06 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] OT- Radials for Vertical Antenna
Mike,
Tuned radials are really not needed in an elevated radial setup.
You just put an ATU at the base of the vertical section and run 2-4 radials
from the ground of the ATU. The only
Hi Randy and All,
A lot of answers to your questions, but I think what you really need to do
is read the extensive coverage of this topic by Rudy Severns, N6LF. Go to
this website:
http://www.antennasbyn6lf.com/
There are at least two groups of QEX articles you probably would be most
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