[kwlug-disc] Home made indoor TV Antenna

Jason Locklin locklin.jason at gmail.com
Wed Apr 16 12:58:52 EDT 2014


On Wed 16 Apr 2014 12:30:26 PM EDT, Khalid Baheyeldin wrote:
> On Wed, Apr 16, 2014 at 12:20 PM, <zixiekat at gmail.com
> <mailto:zixiekat at gmail.com>> wrote:
>
>     I think one of the largest factors in me getting stations from
>     Toronto, is Baden tower is directly between my house and toronto.
>     And being only 4km away, CKCO interferes.
>

The Baden tower is VHF, while all the CN tower stations are UHF (except 
CTV).  Your best bet would be to massively attenuate VHF signals with a 
high-pass filter. I have a UHF/VHF combiner that you could borrow to 
test. They are about 10 bucks, and you can just leave the VHF tap 
unconnected or connected to a short wire to ensure that nearly all of 
CKCO's signal is blocked.

-Jason

>     I'd be willing to try a nice yagi antenna, but don't really want
>     to put out the money just to test something I get via streaming
>     (CBC).
>
>
> I know they stream section by section here
> http://www.cbc.ca/player/News/Canada/
> Which means you have to "hunt" for what segment/show.
>
> Is there a live stream of CBC News without the hunting in a browser?
>
>
>     Sent from my BlackBerry 10 smartphone on the Rogers network.
>     *From: *John Johnson
>     *Sent: *Wednesday, April 16, 2014 11:43 AM
>     *To: *KWLUG discussion
>     *Reply To: *KWLUG discussion
>     *Subject: *Re: [kwlug-disc] Home made indoor TV Antenna
>
>
>     Thanks Joe, for reading and commenting.
>     I did mention: additional elements, such as directors and
>     reflectors,...
>
>     I would put your Fresnel lens and waveguide and "boost"
>     technologies would come under additional elements.
>
>     Regards
>     JohnJ
>
>     On 2014-04-16 11:28, Joe Wennechuk wrote:
>>
>>
>>>     Basically: more metal in the sky == more captured signal (YMMV)
>>>
>>>
>>     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.
>>
>>     ________________________________
>>
>>>     Date: Wed, 16 Apr 2014 11:11:13 -0400
>>>     From: jvj at golden.net <mailto:jvj at golden.net>
>>>     To: kwlug-disc at kwlug.org <mailto:kwlug-disc at kwlug.org>
>>>     Subject: Re: [kwlug-disc] Home made indoor TV Antenna
>>>
>>>     On 2014-04-16 09:55, Colin Mackay wrote:
>>>     I have one of these:
>>>     <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>
>>>     [ 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.
>>>
>>
>>>     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.
>>>
>>
>>>     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
>>>
>>
>>>     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
>>>
>>>
>>>
>>>
>>>
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>>>
>>
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>>>
>>      		 	   		
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>>     .
>>
>>
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> --
> Khalid M. Baheyeldin
> 2bits.com <http://2bits.com>, Inc.
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