<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body bgcolor="#ffffff" text="#000000">
<big>Thanks Joe, for reading and commenting.<br>
I did mention: </big><big>additional elements, such as directors and
reflectors<tt>,</tt></big><tt> ...</tt><br>
<big><br>
I would put your Fresnel lens and waveguide and "boost" technologies
would come under </big><big>additional elements.</big><br>
<big><br>
Regards<br>
JohnJ<br>
</big><br>
On 2014-04-16 11:28, Joe Wennechuk wrote:
<blockquote cite="mid:SNT149-W27D5ACDDBB1A67AEE263A5AF530@phx.gbl"
type="cite">
<pre wrap="">
</pre>
<blockquote type="cite">
<pre wrap="">Basically: more metal in the sky == more captured signal (YMMV)
</pre>
</blockquote>
<pre wrap="">You can also use fresnel lense, or some type of waveguide antenna to boost the signal. There is a lot of DIY about this. I have never built one for Television, but I did do a Pringles can waveguide for wifi, and it was amazing how good it actually worked.
________________________________
</pre>
<blockquote type="cite">
<pre wrap="">Date: Wed, 16 Apr 2014 11:11:13 -0400
From: <a class="moz-txt-link-abbreviated" href="mailto:jvj@golden.net">jvj@golden.net</a>
To: <a class="moz-txt-link-abbreviated" href="mailto:kwlug-disc@kwlug.org">kwlug-disc@kwlug.org</a>
Subject: Re: [kwlug-disc] Home made indoor TV Antenna
On 2014-04-16 09:55, Colin Mackay wrote:
I have one of these:
<a class="moz-txt-link-rfc2396E" href="http://cdn3.volusion.com/m5ytq.j6phj/v/vspfiles/photos/CM-3000A-2.jpg?1385029454"><http://cdn3.volusion.com/m5ytq.j6phj/v/vspfiles/photos/CM-3000A-2.jpg?1385029454></a>
[ edit ]
Did try an 8-bay like in the walmart link above, to no avail.
While I do not have recent experience with RF, my experience with
antenna technology goes back, way back. Perhaps, a decade or 2 or 3 or
4.
That said, IMHO, the basic principles remain.
Please note that I am trying not to sound pedantic. Nor write an essay.
</pre>
</blockquote>
<pre wrap="">
</pre>
<blockquote type="cite">
<pre wrap="">And I apologize for any perceived pedantry and the length.
RF is really a higher frequency of the Electro-Magnetic radiation.
And RF itself covers a wide range of frequencies, for the purposes of
this discussion from MW (medim-wave used for AM radio) though to
microwave.
Excluding the plumbing and stripline technologies of microwave,
reception of the lower frequencies, including VHF, UHF, UHF-HD, etc.
depend on the first principle, i.e. signal capture.
By "signal capture" I mean the capture of the RF radiation in "the
ether", in the desired frequency band. This "signal" will include a
multitude of channels or sources, each with its own content modulation
methods. This "signal" will also include channels or sources from
frequency bands outside of the desired frequency band.
Presumably one of the channels or sources is the desired source in the
desired frequency band. After "signal capture" a variery of
technologoies come in to play to suss out the desired channels or
source from the "captured signal". These technologies include filters,
amplifiers, tuners, etc. And are not the point of this discussion.
Returning to "signal capture", the first principle mentioned above,
involves the principle of induction, i.e. the generation of an
electrical signal in a conductor by the RF energy "in the ether".
Tesla, Hertz, Lenz, Faraday, Maxwell and Fessenden (a Canadian in the
bunch) and others have studied, researched and documented this process.
</pre>
</blockquote>
<pre wrap="">
</pre>
<blockquote type="cite">
<pre wrap="">
However, basically, the strength of the induced electrical signal in
the conductor depends on the properties of the conductor and the
strength of the RF radiation at the point of induction.
We cannot do much about the strength of the RF radiation at the point
of induction.*
That leaves the conductor, and the properties of the same. One of the
properties of the conductor is its "size" or "length" relative to the
frequency of the RF radiation. The "size" or "length" of the conductor
can be used to "tune" the conductor to specific frequency bands. This
can be in a 1:1 relation (full wave) , or in 1:n where n is even
multiples, or more common n:1 where the conductor is in even fractions
of the frequency, e.g. half-wave, quarter-wave, etc.
Basically: more metal in the sky == more captured signal (YMMV)
IMO Antenna packaging like flying saucer is like that of fishing lures
at Canadian Tire. The item must first attract the buyer and whether or
not the item actually works in the wild is secondary.
* Some technologies can improve the strength of the RF radiation at the
</pre>
</blockquote>
<pre wrap="">
</pre>
<blockquote type="cite">
<pre wrap="">point of induction. These include placement and orientation of the
conductor, i.e. antenna. These also include additional elements, such
as directors and reflectors, as seen on Yagi VHF antennas and the
bow-tie on on the Walmart HI-DEF antenna.
/essay
Regards
John Johnson
_______________________________________________ kwlug-disc mailing list
</pre>
</blockquote>
<pre wrap="">
</pre>
<blockquote type="cite">
<pre wrap=""><a class="moz-txt-link-abbreviated" href="mailto:kwlug-disc@kwlug.org">kwlug-disc@kwlug.org</a>
<a class="moz-txt-link-freetext" href="http://kwlug.org/mailman/listinfo/kwlug-disc_kwlug.org">http://kwlug.org/mailman/listinfo/kwlug-disc_kwlug.org</a>
</pre>
</blockquote>
<pre wrap="">
_______________________________________________
kwlug-disc mailing list
<a class="moz-txt-link-abbreviated" href="mailto:kwlug-disc@kwlug.org">kwlug-disc@kwlug.org</a>
<a class="moz-txt-link-freetext" href="http://kwlug.org/mailman/listinfo/kwlug-disc_kwlug.org">http://kwlug.org/mailman/listinfo/kwlug-disc_kwlug.org</a>
-----
Checked by AVG - <a class="moz-txt-link-abbreviated" href="http://www.avg.com">www.avg.com</a>
Version: 2014.0.4355 / Virus Database: 3882/7349 - Release Date: 04/15/14
.
</pre>
</blockquote>
<br>
</body>
</html>