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Hobbyists Create DIY Super TV Antenna

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Old 03-15-2008, 07:20 AM   #1
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Default Hobbyists Create DIY Super TV Antenna

Have any of you OTA fans read about this new updated "old" antenna design? Cooler still, the Open-Source approach means you can get the specs for free and DIY.

WES

Freshly Exhumed writes "Retired and hobbyist antenna engineers working together in the Digital Home forums have taken an obscure 1950s UHF TV antenna called the Hoverman [PDF] and subjected the design to modern software-based computer modeling in hopes of optimizing its middling performance. The result: the new Gray-Hoverman antenna is more powerful than similar commercially manufactured consumer antennas in every category, sometimes by whopping amounts. Best thing yet: they've released the design, diagrams, and schematics under the GPLv3 so that we can roll our own! Quoth one of the testers, a former U.S. Government antenna engineer: 'Boy, this antenna is hot... This antenna is a vast, and I mean REALLY VAST improvement over anything I have used.' The home thread of the Gray-Hoverman development gives the background of their great work."

Read more of this story at Slashdot.

http://hardware.slashdot.org/article...21223&from=rss
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Old 03-15-2008, 04:47 PM   #2
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not that new, not that hot.
fine for people close to the transmitters.

not impressed.
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Old 03-15-2008, 05:51 PM   #3
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Quote:
Originally Posted by scootski View Post
not that new, not that hot.
fine for people close to the transmitters.

not impressed.
Not so fast, there.

I use an old 4-bay Hoverman from Radio Shack with an Archer pre-amp (also Radio Shack). It picks up all of the UHF stations, analogue and digital, from Lyon Mountain, NY (51 miles away), Terry Mountain New York (56 miles away) and Mount Mansfield, VT (81 miles away). The "spread" in bearings to the transmitters is over 45 degrees and I have the antenna "pointed" mid-way between Mount Mansfield and Lyon Mountain (A rotor is out of the question because the antenna feeds TV in 4 rooms). Reception is very good on all channels. So, I guess 81 miles is close enough in my situation. Needless to say, I have bookmarked the site.

Last edited by BrianO; 03-15-2008 at 05:55 PM.
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Old 03-15-2008, 06:28 PM   #4
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Originally Posted by scootski View Post
not that new, not that hot.
fine for people close to the transmitters.

not impressed.
But most others are in fact impressed.
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Old 03-15-2008, 07:19 PM   #5
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But most others are in fact impressed.
naw... there are cheaper and better... homemade with
better range and narrower beamwidths...

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Old 03-15-2008, 08:25 PM   #6
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lol...I can pick up one channel from b'ham at 100+ miles on a coat hanger....well not that well because of cci, but it goes to show that there is anomalies out there where stations at great distances can be picked up on cheesy antennas. (its analog 33 actually from Tuscaloosa I believe) with the 91xg it comes in perfect.
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Old 03-15-2008, 09:02 PM   #7
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naw... there are cheaper and better... homemade with
better range and narrower beamwidths...
So you're keeping them a secret?
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Old 03-15-2008, 11:06 PM   #8
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Fine for people close to the transmitters.
Assuming a line of sight; I found a paper clip with one "leg" bent out and stuck into the "antenna in" worked nicely as an antenna. Ok at my church but I've got a hill right behind my house.
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Old 03-17-2008, 04:26 PM   #9
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So you're keeping them a secret?
I used to have tons of Xerox'ed copies from tons of magazines
years ago on building TV antlers... other electronics projects
too... but wouldn't you know it... we threw all the crap out
a year ago... cleaning my Ham Room....

and then... yupper... all this new HDTV stuff hits the fan and
ALL MY notes are gone ! DAMN! I wish i still had it all...but i
don't.

Had neat articles from even the days of the little bitty
Pop'Tronics magazines Xeroxed too... and other mags.
I even had a couple of obscure engineering books on TV
antennas only... that i Xeroxed... had all the data as to
elements sizing and phasing etc....

but it's all gone now.
(It was a case-of-paper sized box...FULL. Very heavy.
ALL on making and designing TV antlers).

So, if and when i do a homebrew creation, i will take notes
and post it.

I really wish i had all that stuff yet... it would be Prime Time
IF I still had it ! DAMN !

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Old 03-19-2008, 10:29 AM   #10
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not that new, not that hot.
fine for people close to the transmitters.

not impressed.
Me neither. It doesn't appear to be any better than a CM-4221, and inferior to a 4224 or 4228: http://www.digitalhome.ca/ota/supera...erformance.htm
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Old 03-19-2008, 12:18 PM   #11
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Me neither. It doesn't appear to be any better than a CM-4221, and inferior to a 4224 or 4228: http://www.digitalhome.ca/ota/supera...erformance.htm
It's 56" of wire bent up every 7" at 90 degree angles, and a foil blanket background, what could be easier? cheaper? faster? Check the specs.. sure better than paying $ and from the forum posters.. it's better.
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Old 03-19-2008, 03:14 PM   #12
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It's 56" of wire bent up every 7" at 90 degree angles, and a foil blanket background, what could be easier? cheaper? faster? Check the specs.. sure better than paying $ and from the forum posters.. it's better.
I totally agree... plus you can construct a bunch of them and
phase them too.... fer cheap.

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Old 03-19-2008, 05:05 PM   #13
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I don't think there's been that much "new" in antenna design in the last 30 - 50 years. The difference now is we can use computer modeling and better test gear to optimize designs. Of course, the desire to receive HDTV off-air means a lot of the designs are up-banded, or in the case of a rhombic all of a sudden become practical.

I still plan on building my larger UHF rhombic despite my success with the commercial antennas. I did modify one of these http://www.solidsignal.com/prod_disp...om=Large#xview with an additional reflector and that lets me pick up two channel 13s.

Last edited by donnyjaguar; 03-19-2008 at 05:09 PM.
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Old 03-20-2008, 06:21 AM   #14
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Originally Posted by ah802 View Post
It's 56" of wire bent up every 7" at 90 degree angles, and a foil blanket background, what could be easier? cheaper? faster? Check the specs.. sure better than paying $ and from the forum posters.. it's better.
Laying down a credit card, and waiting for your $50 CM4228 to arrive is certainly easier.
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Old 03-20-2008, 08:53 AM   #15
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Quote:
Originally Posted by donnyjaguar View Post
I don't think there's been that much "new" in antenna design in the last 30 - 50 years. The difference now is we can use computer modeling and better test gear to optimize designs. Of course, the desire to receive HDTV off-air means a lot of the designs are up-banded, or in the case of a rhombic all of a sudden become practical.

I still plan on building my larger UHF rhombic despite my success with the commercial antennas. I did modify one of these http://www.solidsignal.com/prod_disp...om=Large#xview with an additional reflector and that lets me pick up two channel 13s.
I visited the above link, well... that certainly can NOT be called
robbery... nice price there ! That is a possible indeed at that
price. Nice find.
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