Yes Gary, After blowing then away in a CQ 160m Contest by 1m points I
figured it was rather an expensive lesson they learn.
I was using my 51ft top loaded vertical and a lot of wire under it. 73 Clive
GM3POI
-Original Message--
Subject: Re: Topband: HFTA, Radio Arcala, general comments
More comments.
Radio Arcala – My only experience with them is in CQ WW CW a couple years ago.
There was another OH up that a way running a vertically polarized antenna (I
don't remember at the moment if it was a vertical or a 4-Square). This other OH
had a stronger signal than Radio Arcala for
Thanks to all who responded to my inquiry. The antenna is up and running.
Base is around 60 ft and the top of the tee is around 170 ft. it seems
to be working pretty good. Thanks for the advice.
73 Bill K4XS/KH7XS
___
Topband reflector -
Rik,
I think your suggestion is part of the point of this discussion. Modeling
things at higher frequencies, like 40 meters, wouldn't apply to how 160
works.. IF what we are saying is true or has merit. The only way to know
that 160 truly is different is to model at 160 :) :)
Anything tall or new received good reports, if I told the other person it was
tall or new. This is a common result, similar to the well-known G5RV effects.
Pick an unpopular antenna like a G5RV and say you are using it in a test, and
even if you do not actually switch antennas the G5RV will get
OK I'm confused.
All the AM radio stations registered with FCC publish curves showing 2.5, 0.5,
and 0.15 mV/m contours. I'm assuming these are field strengths on the ground
e.g. low angles.
http://radio-locator.com/cgi-bin/pat?call=WGNservice=AMstatus=Lhours=U
I always thought that these were
Ionosphere reflection layers are a ever changing part of the DX signal. Yes,
every antenna has its day, but the what angle is consistently better ?. My
experience has been the angle gets higher above ground as the frequency is
lowered. Also this angle is not the same between the equator and
Qualitative or Quantitative...Let me get this straight. If I call CQ
and the band is open to Europe on 160 and nobody replies after a couple
of hours with my TX antenna #1 with no replies and after switching to
antenna #2 I work a dozen stations in rapid succession, that should tell
me
On Thu, Oct 25, 2012 at 1:46 PM, Bruce k...@myfairpoint.net wrote:
AM broadcast band antennas 5/8 1/2 wave tall are rarely used any more.
I noticed a reduction of the tall AM towers starting about the 1960's.
73
Bruce-K1FZ
Wouldn't that have corresponded to the FCC's reduction in
On 10/25/2012 1:46 PM, Bruce wrote:
AM broadcast band antennas 5/8 1/2 wave tall are rarely used any
more. I noticed a reduction of the tall AM towers starting about the
1960's.
73
Bruce-K1FZ
Bruce, I would add one exception to that and that would be the use by
some broadcasters
AM broadcast band antennas 5/8 1/2 wave tall are rarely used any more.
I noticed a reduction of the tall AM towers starting about the 1960's.
An optimized half-wave design (180-195 electrical degrees) is still the
height of choice for AM broadcasters. There are many factors, including
I was involved in broadcast engineering for many years ( probably one of
the reasons for my interest in 160m and AM ).
There were numerous technical write ups about stations who wanted the
maximum theoretical ground wave signal and spent big bucks to put up 5/8
wave verticals. They were
There were numerous technical write ups about stations who wanted the
maximum theoretical ground wave signal and spent big bucks to put up 5/8
wave verticals. They were always disappointed in the unexpectedly reduced
coverage area that resulted.
Most of the reasoning for this unexpected
- Original Message -
From: Guy Olinger K2AV olin...@bellsouth.net
To: Bruce k...@myfairpoint.net
Cc: topband@contesting.com
Sent: Thursday, October 25, 2012 10:56 AM
Subject: Re: Topband: Best angle of radiation ?
Wouldn't that have corresponded to the FCC's reduction in
Qualitative or Quantitative...Let me get this straight. If I call CQ
and the band is open to Europe on 160 and nobody replies after a couple
of hours with my TX antenna #1 with no replies and after switching to
antenna #2 I work a dozen stations in rapid succession, that should tell
me
Received my 7O6T QSL card via snail mail today for three lower bands. Time
to celebrate with a 12 FL OZ diet pepsi.
Bruce
___
Topband reflector - topband@contesting.com
Why we are talking about A B test knowing that the ionospheric signal is
fading up and down at least 10dB!?
This can be verified by anybody having a stable carrier as a receiving
signal and monitor it for few minutes...
For a proper A B test one should switch A B very fast and record
Herb
A good way to test a TX antenna is to listen to one of the many SDR
receivers available on line
We can use the reverse beacon network. RBN, select DX spot HF 160m
http://www.reversebeacon.net/dxsd1/dxsd1.php?f=3
The SDR return the signal intensity in db and you can compare with
Bruce-K1FZ wrote:
AM broadcast band antennas 5/8 1/2 wave tall are rarely used any more.
I noticed a reduction of the tall AM towers starting about the 1960's.
Guy Olinger replied:
Wouldn't that have corresponded to the FCC's reduction in clear-channel
strategies, and more local market
Lloyd Berg N9LB wrote:
There were numerous technical write ups about stations who wanted the
maximum theoretical ground wave signal and spent big bucks to put up 5/8
wave verticals. They were always disappointed in the unexpectedly reduced
coverage area that resulted. Most of the reasoning
Most of the reasoning for this unexpected negative result was attributed
to the minor high-angle lobe produced by the 5/8 wave coming back down and
interfering with the main lower angle signal. As a result, those station
who had experimented with 5/8 wave towers usually reduced them to 1/2
On 10/25/2012 11:51 AM, Tom W8JI wrote:
Qualitative or Quantitative...Let me get this straight. If I call CQ
and the band is open to Europe on 160 and nobody replies after a
couple of hours with my TX antenna #1 with no replies and after
switching to antenna #2 I work a dozen stations in
How we test really depends on what we need to know.
In order to estimate what is the real elevation angle (3dB or HPBW) of an
antenna on far field, we should gather quantitative data.
Tom, what you are after with your measurements/observation?
The key to accurate testing is time span of the
Qualitative or Quantitative...
The above term comes from the measurement technique. I'll explain theme below.
Qualitative measurement are when the measurement of a phenomenon or object
parameter is expressed as meeting a certain criteria or is better/worst then
another one, without figures.
Ward N0AX wrote:
... The electron gyrofrequency (I just *love* saying gyrofrequency, don't
you?) in the lower layers ... is much closer to 1.8 MHz and causes the wave
coupling to change dramatically in ways that are not well understood. This
changes with latitude and time of day (or night).
From N4IS:
Another advantage is to know if the band is open, thing not so common
nowadays, I don't raise a skimmer in EU for several weeks, JA, ZL or VK
since August.
Keep in mind that both of the Skimmers in ZL have very poor reception on
160. ZL2RV is using a short active antenna, and I
In order to estimate what is the real elevation angle (3dB or HPBW) of an
antenna on far field, we should gather quantitative data.
Tom, what you are after with your measurements/observation?
Only which is louder compared to a standard I maintain.
If one will intend to use a statistical
I was having an educational discussion with a friend tonight about the
ramifications of feeding a vertical with an elevated transmission line. The
situation would be he does not want to dig up the mesh for the 20' around the
base. It was suggested to bring the transmission line out of the ground
FWIW, this is what I do. I have 450 ohm line 5 feet high
over a mesh ground screen. There is a balun at the end of
the line and coax drops down onto the mesh for the final
few feet to the feed point. Seems to work fine.
Rick N6RK
On 10/25/2012 7:41 PM, D Rodman MD wrote:
I was having an
I´ve tried to inquire how it works but it has been awfully
silent from that direction.
I can tell one story, no science in this but for whatever it´s
worth.
During a CQWW CW 160 contest I was sitting on a frequency running
stations, it was around 19Z so I worked lots of Asia JA´s and
stuff. All
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