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Author Topic: Digital TV antenna  (Read 5928 times)
AJ4CU
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Posts: 78




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« on: March 08, 2011, 09:20:32 AM »

Hi All,

Has anyone out there built or have a design for a digital tv antenna? I would like to place one on my tower for when cable goes out.

Thanks all...

73 DE AJ4CU
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K7KBN
Member

Posts: 2802




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« Reply #1 on: March 08, 2011, 09:32:07 AM »

Just determine the frequency of the signal you're concerned with and build an antenna for that range.  The antenna doesn't care whether the signal is analog or digital, just its frequency.

73
Pat K7KBN
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73
Pat K7KBN
CWO4 USNR Ret.
K5LXP
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Posts: 4484


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« Reply #2 on: March 08, 2011, 11:19:06 AM »


<www.wa5vjb.com/references/CheapYagi4HDTV.pdf>


Mark K5LXP
Albuquerque, NM
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K2DC
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Posts: 1362


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« Reply #3 on: March 08, 2011, 11:32:42 AM »

Google is your friend.  Just do a search on Homebrew DTV antenna and you'll find lots of stuff.  Typical materials are wood for frames, metal screen material or tin foil for reflectors, coat hangers for elements, 300 ohm twin lead or hookup wire for phasing harnesses, all really cheap and available stuff.  There are a million ways to go.

GL & 73,

Don, K2DC

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KB4MB
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Posts: 295




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« Reply #4 on: March 09, 2011, 08:47:42 AM »

I am adding an antenna myself - and for me, the time and energy wasn't worth the 50 dollars to buy a good one with lots of elements, when I can spend that energy on ham antennas. 

I found one with shipping under 50, range is 60 miles, and will mount on the side of the tower, no problem.
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VA3WXM
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Posts: 277




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« Reply #5 on: March 09, 2011, 11:16:53 AM »

Google "Gray-Hoverman".
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N9MXY
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Posts: 237




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« Reply #6 on: March 09, 2011, 02:06:02 PM »

I just put up a small 4 bay antenna today at 40' and it beats my deep fringe RS LP/Yagi with a 12' boom at 60'.  Very suprising for an antenna that is all of 24" wide 30" tall and 4" deep. It'd Based on the Hoverman design
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KB4MB
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Posts: 295




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« Reply #7 on: March 09, 2011, 06:23:17 PM »

Can you give us a link?
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W0BTU
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« Reply #8 on: March 09, 2011, 09:31:50 PM »

I built this, and it works for me. I'm watching NOVA on PBS right now using that antenna indoors.

http://www.wa5vjb.com/references/CheapYagi4HDTV.pdf

I'm 49 miles from the station (KOZK, 100 kW).
« Last Edit: March 12, 2011, 10:52:08 AM by W0BTU » Logged

K8AC
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Posts: 1472




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« Reply #9 on: March 10, 2011, 06:53:27 AM »

While that design make work OK for the UHF channels, be aware that not all the digital channels are in the UHF range.  In many areas, at least one of the old VHF channels will be found as the home of a digital station.  In our area, channel 11 is used by a digital station and that frequency is somewhere down around 198 MHz.  The newer "digital TV" antennas generally have much shorter elements (they don't cover the old channels 3-7 and maybe higher).  The beauty of the commercial products is that they are usually engineered to last decades out in the elements without problems.  At our location, we have access to around 20 digital stations over the air, about 1/2 of those offering HD.  Dig out those old Alliance rotors and erect a TV antenna outside.  Even homeowner's associations can't prevent a reasonable installation today.
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KB4MB
Member

Posts: 295




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« Reply #10 on: March 10, 2011, 08:22:59 AM »

In my area in North Carolina, only like one out of 40 channels are VHF, and don't go by the station numbers, as most had been relocated.  The only way to check is to go to antennaweb.com or tvfool.com and put in your area.  It will tell you the size you need and distance and direction.
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KD4LLA
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Posts: 459




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« Reply #11 on: March 10, 2011, 02:17:15 PM »

An antenna does not care whether a signal is digital or analog.  My scanner antenna receives (800mhz) P25 digital just as easily as it does (VHF/UHF) analog.  The tvfool.com site can provide what "virtual" channels there are in your area.

Mike
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N9MXY
Member

Posts: 237




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« Reply #12 on: March 10, 2011, 06:28:02 PM »

We have one VHF channel here in Indy and it is the only channel with a lower signal with the new antenna at 40' vs the old antenna at 60'.  The signal is 83 now compared to 95 with the old antenna, I start to get dropout at 70. First decent day I get it's going up to 60' and I'll see if it's the coax or the antenna that is making the difference.

I got mine from ANTENNAS DIRECT.COM  It's a little DB4 $45 including shipping.  It's supposed to have a wide capture area, which is good for me because my stations are sattered around on a 30 degree arc, If I can get them without walking the rotor around I'll be a happy camper!
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K8AC
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Posts: 1472




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« Reply #13 on: March 12, 2011, 10:33:49 AM »

The DB4 is a UHF-only antenna.  Raising it will do nothing for the VHF channel. 
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N9MXY
Member

Posts: 237




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« Reply #14 on: March 13, 2011, 07:42:47 PM »

Well it seems to be recieving the VHF signal well enough where it's at but why wouldn't putting it up higher improve the signal? if nothing else the coax termination would be higher in the air?

I think maybe Wednesday I'll find out.... I'm really more curious at this point if my 75' of quad shield RG6 that I took off my Sat dish is that much better at UHF than 125' of standard RG6 which is what's at the top of the tower.
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