Bob, for a good understanding of the concepts of phasing in these RX antennas,
read Chapter Seven of ON4UN's Low Band DXing. The length of the delay lines
primarily affects the placement of the nulls of the array while the voltage
output of the antennas and amplifiers controls the depth of the
What about pushing them thru holes in the wall? I do that with the radials
for a pair of 2 wire Beverages that terminate at trees right at the wall
which has been there since at least the early 1800's.
If you have to push 2-3 thru the same hole it shouldnt matter.
Carl
KM1H
- Original
On 8/10/2012 11:17 AM, N2TK, Tony wrote:
I shunt feed my tower for topband. I use variable vacuum caps and a vacuum
relay at the base to switch between the low end and the high end of the
band. It seems to work okay. I have 100' buried radials spaced 10' at the
ends from o degrees going
I can run a NEC simulation tomorrow to see how much radials up and over
affect things.
Dave WX7G
On Aug 10, 2012 10:16 AM, Herb Schoenbohm he...@vitelcom.net wrote:
On 8/10/2012 11:17 AM, N2TK, Tony wrote:
I shunt feed my tower for topband. I use variable vacuum caps and a
vacuum
relay at
I would expect an up and over to clear the wall would result in a
choke-like effect on the radial and would, at best, reduce the radial's
effectiveness.
It should be easy to just drill some small (maybe 1/4?) holes through
the wall in a few places to pass the radials through. With a decent
hammer
Dennis, W0JX, is nearly correct but didn't go far enough.
In the last few years I've had up several Hi-Z two element arrays, a Hi-Z 4-sq,
and a Hi-Z 2-3 array. They all exhibit the same characteristics. Depending on
the element spacing used, the upper frequency limit may be over 7 MHz. For
Simulation will tell the tale but in the mean time we have two things
caused by the up-and-over that we can mull over:
1) There is cancellation of the magnetic fields by the up-and-over wires
thereby minimizing any additional inductance to the normal radial return
current.
2) current is induced
Hi Carl,
The guys that built the stone wall did too good a job. I have been looking
for that proverbial hole in the wall.
N2TK, Tony
-Original Message-
From: ZR [mailto:z...@jeremy.mv.com]
Sent: Friday, August 10, 2012 12:07 PM
To: N2TK, Tony; 'topband'
Subject: Re: Topband: Radials
Tnx Dave,
That would be very helpful.
73,
N2TK, Tony
-Original Message-
From: topband-boun...@contesting.com [mailto:topband-boun...@contesting.com]
On Behalf Of DAVID CUTHBERT
Sent: Friday, August 10, 2012 12:20 PM
To: Herb Schoenbohm
Cc: N2TK, Tony; topband
Subject: Re: Topband: Radials
Thanks Bill and Herb about drilling a hole through the wall. That could be
tough. It is a stone wall with no mortar. It is about 20-28 thick. It is
well constructed with large field stones. It would be rough to drill through
all of that. I had thought about taking portion of the wall apart but
Tony, no need to fret about drilling. I would say than going under is
better than going over. The crews who do direct burial for cable TV and
fiber have special directional drill attachments that you should try to
borrow. the will go straight down along the wall until they get to the
dirt
Rent a hammer drill with a 1/2 or 3/4 bit and an extension. Takes about 15
minutes a hole as long as you have AC out there. My 3/4 bit is 12 long and
Ive used it several times to bust up big boulders at or near the surface in
the yard.
Start at a point where there is space between 2 rocks to
Tony the walls of my house are Stone and about the thickness of your wall.
When I came to installing a good ground system I drilled through the stone
wall fairly easily and ran copper tubing through for the ground. I do not
see any difference between that and your Wall. Give it a try with a good
The directional drilling rigs used for fiber installation under
highways, etc., aren't *attachments*, they are big hydraulic machines
with 6 figure price tags. I doubt very much anyone would lone one out,
and I wouldn't want to borrow one if I didn't know how to run it. Also,
directional drilling
Tony,
If snaking one or more wires under the fence isn't feasible, I would
simply run a buss wire around the base of the stone wall to the nearest
opening and then back down the other side. Attach your radials to this
buss wire on the tower side, and the continuation of these radials
from the
I use 5 two wire Beverages for 10 directions and have good directivity down
to the 175 KHz LF BCB and they are only 500-700' long. Performance seems to
exceed published info. On the US BCB its like aiming a long yagi on 2M,
multiple stations on the same frequency can be heard with ease during
On 8/10/2012 4:52 PM, Bill Wichers wrote:
The directional drilling rigs used for fiber installation under
highways, etc., aren't *attachments*, they are big hydraulic machines
with 6 figure price tags.
Bill I used here a Bobcat with a vibrating plow attachment for short
runs. It also had a
ZR wrote:
Sometimes I wonder if its my very poor RF ground conditions that tilt the
wave more and result in the performance of a much longer antenna.
Carl
KM1H
My ground is high conductivity according to the FCC map, so
maybe that doesn't explain the performance.
Rick
N6RK
How does it work way down into LF?
Carl
- Original Message -
From: Rick Karlquist rich...@karlquist.com
To: ZR z...@jeremy.mv.com
Cc: rich...@karlquist.com; topband@contesting.com
Sent: Friday, August 10, 2012 8:14 PM
Subject: Re: Topband: RX 4 SQ Phasing
ZR wrote:
Sometimes I
For those of you that use LOTW, HK0NA logs were supposedly uploaded to LOTW
today. Having said that I didnt get 160 confirmed as yet even tho I am in their
log books. I am guessing it takes a long time to process 195000 QSOs in the
LOTW system so I will wait a day or two before I start
Just an out of the box thought...
Anyone guess what would happen if the radials going over
the wall were coax shielded ?
Signed,
Anonymous :-))
...
--- On Fri, 8/10/12, Herb Schoenbohm he...@vitelcom.net wrote:
From: Herb Schoenbohm he...@vitelcom.net
Subject: Re:
Anyone guess what would happen if the radials going over
the wall were coax shielded ?
That's a VERY interesting thought. Somebody model it please.
Bob VE7BS
___
UR RST IS ... ... ..9 QSB QSB - hw? BK
Maybe it is too late at night, but why would it make any difference whether
a radial was coax shielded or not?
Radials perform lying on the ground, slightly buried under ground, or even
elevated. The recent FCP discussion revealed a lot about this.
If a radial runs along the ground and then up
I use 5 two wire Beverages for 10 directions and have good directivity down
to the 175 KHz LF BCB and they are only 500-700' long. Performance seems
to
exceed published info. On the US BCB its like aiming a long yagi on 2M,
multiple stations on the same frequency can be heard with ease during
Here's how I lay radials in the woods with heavy brush.
I have a ~15 foot long piece of wooden oak stairway handrail. The kind
you see for basement stairs. It's about 2 inches in diameter and has a
flat on one side so it's D shaped in cross section.
With the flat facing down, cut a bevel on
If a radial runs along the ground and then up over a wall, what difference
would it make?
Good question.
The radial only goes up for 4 feet and back down for 4 feet.
That is exactly like adding a 4-foot shorted stub in series with the radial.
All that worry about induced current in a 4-foot
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