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Today's Topics:
1. Re: Stacked verticals - followup (David Raymond)
2. The Quest to save AM radio (Ken Claerbout)
3. Re: Stacked verticals - followup (HAROLD SMITH JR)
4. Re: The Quest to save AM radio (rfoxwor1@tampabay.rr.com)
5. Measuring Vertical input parameters while installing radials
(Eduardo Araujo)
6. Re: More anecdotal "stories" to cause one to stop and....
(Richard Fry)
----------------------------------------------------------------------
Message: 1
Date: Tue, 10 Sep 2013 15:01:27 -0500
From: "David Raymond" <daraymond@iowatelecom.net>
To: "Bill Cromwell" <wrcromwell@gmail.com>, <topband@contesting.com>
Subject: Re: Topband: Stacked verticals - followup
Message-ID: <832F1E4536934B84BE0D014FAA4516F4@radiocomputer>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=response
We have a Franklin antenna at WHO, 1040 KHZ, here in Des Moines. I've
been
told it is one of the few remaining in the country.
73. . . Dave
W0FLS
----- Original Message -----
From: "Bill Cromwell" <wrcromwell@gmail.com>
To: <topband@contesting.com>
Sent: Tuesday, September 10, 2013 12:34 PM
Subject: Re: Topband: Stacked verticals - followup
Hi Ed,
The engineer at WTIC responded. That station does not have a Franklin
antenna but has "series fed halfwave" during the day and switches in a
second one at night, phased to change the radiation pattern. He also told
me that their 'sister station', KDKA in Pittsburgh, does use a Franklin
antenna. Some members near Pittsburgh may want to roll by for a peek at
it.
73,
Bill KU8H
On 09/06/2013 04:13 PM, Edwin Karl wrote:
There are several interesting articles if you Google "Franklin Antenna"
they are mechanically BIG and require feeding ingenuity (hams are known
for this feature ...) but are stacked verticals, note- phase the top
element
to avoid cancellation.
If memory serves me right WTIC in Hartford phased two of these puppies,
but it's been a long time ...
73!
ed k0kl
_________________
Topband Reflector
_________________
Topband Reflector
------------------------------
Message: 2
Date: Wed, 11 Sep 2013 19:29:00 -0500 (CDT)
From: Ken Claerbout <k4zw@verizon.net>
To: Topband@contesting.com
Subject: Topband: The Quest to save AM radio
Message-ID: <14507091.1201183.1378945740542.JavaMail.root@vms170033>
Content-Type: text/plain; charset=UTF-8
"Exactly right. Isn't small government wonderful?" That's really not the
problem. Many federal agencies, including the one I work at, have plenty
of money and personnel. It's more a function of priorities and who sets
them.
Years ago when I was in a Master's program, one of the courses I took was
Telecommunications Law taught at the George Mason University School of
Law. It was taught by an adjunct professor who was an attorney at the FCC.
I was the only engineer in the class. It was a fantastic class, the best
one of the program! One of the things we looked at was expanding broadband
access in the US. BPL was prominent at the time. I remember trying to make
the case about its interference potential to existing services and I was
basically told I hear you, your right, but you are barking up the wrong
tree. It was clear many of the decisions were being made by policy types
and not by people that understood its implications, especially the
technical part. If BPL was going to be defeated, it would happen because
it wasn't financially viable, not on technical merits, because it harmed
existing services. Who could be against greater broadband access for the
public? Are other services like guys with t
heir ham radios and AM broadcast stations (who listens to AM) going to
trump that objective?
I'm more dubious about greater enforcement than some it appears. It's an
uphill battle on many fronts. Aren't there powerline RFI cases that have
gone unresolved for years because the FCC won't step in or won't enforce
their own standards? Besides, how long have guys like K1MAN and KZ8O been
on double secret probation, and nothing can be done about them?
Ken K4ZW
------------------------------
Message: 3
Date: Wed, 11 Sep 2013 20:01:08 -0700 (PDT)
From: HAROLD SMITH JR <w0rihps@sbcglobal.net>
To: David Raymond <daraymond@iowatelecom.net>, Bill Cromwell
<wrcromwell@gmail.com>, "topband@contesting.com"
<topband@contesting.com>
Subject: Re: Topband: Stacked verticals - followup
Message-ID:
<1378954868.24080.YahooMailNeo@web181503.mail.ne1.yahoo.com>
Content-Type: text/plain; charset=iso-8859-1
Hello Dave.
Years ago, 70 or so. I was brought up in Marshall, MO. Television was't
around.?
We listened to WHO, KCMO and KMOX most of the time. My folks had a BIG?
RCA Console with many metal tubes and covered BC, and 2 SW bands. Sure?
wish I had it now.?
73 ?Price W0RI
We have a Franklin antenna at WHO, 1040 KHZ, here in Des Moines.? I've
been told it is one of the few remaining in the country.
73. . . Dave
W0FLS
----- Original Message ----- From: "Bill Cromwell" <wrcromwell@gmail.com>
To: <topband@contesting.com>
Sent: Tuesday, September 10, 2013 12:34 PM
Subject: Re: Topband: Stacked verticals - followup
Hi Ed,
The engineer at WTIC responded. That station does not have a Franklin
antenna but has "series fed halfwave" during the day and switches in a
second one at night, phased to change the radiation pattern. He also told
me that their 'sister station', KDKA in Pittsburgh, does use a Franklin
antenna. Some members near Pittsburgh may want to roll by for a peek at
it.
73,
Bill? KU8H
On 09/06/2013 04:13 PM, Edwin Karl wrote:
There are several interesting articles if you Google "Franklin Antenna"
they are mechanically BIG and require feeding ingenuity (hams are known
for this feature ...) but are stacked verticals, note- phase the top
element
to avoid cancellation.
If memory serves me right WTIC in Hartford phased two of these puppies,
but it's been a long time ...
73!
ed k0kl
_________________
Topband Reflector
_________________
Topband Reflector
_________________
Topband Reflector
------------------------------
Message: 4
Date: Thu, 12 Sep 2013 9:57:13 +0000
From: <rfoxwor1@tampabay.rr.com>
To: topband@contesting.com
Subject: Re: Topband: The Quest to save AM radio
Message-ID: <20130912095713.WGEQC.24505.root@hrndva-web13-z01>
Content-Type: text/plain; charset=utf-8
Unlikely to ever get past the starting gate as AM Broadcast is a worldwide
allocation and I'd think that many other nations have an opinion on this.
73 Bob k2euh
---- Mike Armstrong <armstrmj@aol.com> wrote:
Brad,
*I* say.... GOOD, let them kill AM broadcast and give the band to US.....
we will put it to good use.... he he he he. Plus, since so many people
have AM broadcast receivers> _________________
Topband Reflector
------------------------------
Message: 5
Date: Thu, 12 Sep 2013 05:28:21 -0700 (PDT)
From: Eduardo Araujo <er_araujo@yahoo.com>
To: Topband <topband@contesting.com>
Subject: Topband: Measuring Vertical input parameters while installing
radials
Message-ID:
<1378988901.91116.YahooMailNeo@web160704.mail.bf1.yahoo.com>
Content-Type: text/plain; charset=iso-8859-1
Hi everyone, I recently complete the installation of +100 1/4 radials for
the 1/4 vertical.
I measured input vertical parameters using AIM4170 from 1600 to 2000Kc
I assumed it is not something new for many of you, but I wonder if the
information I collected may be of interest for some of the group members.
I have available for sharing BMP or JPG images of each scan which were run
at 2, 4, 8, 16, 32, 60 and +110 radials. Also, I have the .scn files for
each scan which could be viewed using AIM4170 SW even though you don?t
have the unit.
The good thing looking at the files using the sw is that you can move the
cursor and have all the values at all fcies from 1600-2000 Kc
In case someone is interested, let me know and I will see the way to share
it.
?73 to everyone.... Eddie, LU2DKT
PS: By the way, what a nice toy the AIM !!!, Even though I bought it more
than one year ago, this is the first time I use it
------------------------------
Message: 6
Date: Thu, 12 Sep 2013 09:35:01 -0500
From: "Richard Fry" <rfry@adams.net>
To: <topband@contesting.com>
Subject: Re: Topband: More anecdotal "stories" to cause one to stop
and....
Message-ID: <4D0373FEE0024E75A5830E161C68B4ED@ToshLaptop>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Paul Christensen, W9AC wrote:
The surface wave tool most be used in conjunction with the normal modeling
application to get a complete and accurate vertical profile from 0 through
90 degrees.
Agreed.
That a vertical monopole 5/8 wavelength and less in height, using a less
than perfect ground plane has a certain takeoff angle above the horizon
where radiated field is maximum is a very common (almost universal) belief
of ham radio operators This is based on the use of MoM software such as
NEC
to model only its far-field elevation pattern.
The graphic below shows a different conclusion when considering the
surface
wave in NEC evaluations, for the parameters shown.
The NEC far-field pattern for 0.1 km shows a maximum field intensity of
590
mV/m at an elevation angle of 23 degrees (the assumed "takeoff angle").
It
also shows that the field at an elevation angle of 5 degrees is 348 mV/m.
The NEC surface-wave pattern for 0.1 km shows that the maximum field lies
in
the horizontal plane rather than at 23 degrees, and is about 890 mV/m
rather
than 590 mV/m.
The surface wave analysis also shows that the field radiated toward
5-degree
elevation is about 850 mV/m, rather than the 348 mV/m shown by the
far-field
analysis. Of course, the ratios of these fields are even greater for
elevation angles below 5 degrees, and infinite in the horizontal plane.
It is true that at great distances from a vertical monopole, the radiation
present at low vertical angles is much less than at higher angles. But
that
does not mean that the greater radiation directed at low elevations __as
launched by the monopole__ no longer exists. The radiation toward an
elevation angle of 5 degrees shown in the surface wave plot continues in
essentially a straight line, to reach the ionosphere.
It is the radiation launched at these low elevation angles that can
provide
the greatest single-hop range and fields for skywaves reaching that range,
even though its existence might be unrecognized, or disregarded.
http://s24.postimg.org/6nchfpt1h/NEC_FF_vs_NF_Calcs.jpg
R. Fry
------------------------------
Subject: Digest Footer
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End of Topband Digest, Vol 129, Issue 20
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