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Old 06-28-2009, 06:36 PM   #11 (permalink)
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Originally Posted by divxhacker View Post
Well, I went shopping for DTV antennas, and was looking for an antenna with plenty of elements.

This one caught my eye:



I ordered it. However, what I got was this one:



That's the Walito 2602. Very similar to the QuantumFX ANT-108 I actually received:





Manual was riddled with Engrish. "Coockial cable" "Rotalon push button" "Emote controller" amongst correct spellings in repetitions elsewhere. Spanish language half had no errors. The remote control and power unit are covered with paper stickers. Needless to say, I was quite sunk. I asked the seller for a $10-$15 partial refund.

Then I tried it. Oooh. It worked.

Have a look at this raw, uncut video:

+ YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.


Yes, I just realized my biggest goof: I HAD THE TV SOUND OFF! Well, I did say "raw," didn't I? Besides, I think the sound is gone on that TV. It IS beat up, as I have to bang it ala-Onslow to get it to work right.

You'll see a velcro-docked camera in front of the TV. That's a CVS one-time-use camcorder hooked to a custom computer cable, which is how the video was recorded. I have 7 of these cameras. They're wonderful, and cheap to replace if need be.


I mounted it "apartment style", on a short CD spindle, setting it on the TV.

Rotation motor didn't work, as it was a brushless "A/C pulse rotation" motor that are used in cheapo electric analog pool clocks. Sure it has few parts to corrode, but if it was parked in a midpoint, it won't budge. If it had a solenoid that tapped the motor to run, then it would work all the time. Another idea would be a plastic spring-tooth system so that the magnetic pole of the motor wheel would be at the correct position to move when power was applied. Maybe washing the sticky grease inside out with WD-40 could help. Cheap Tongcheng brushless motor. Yes, I took apart the motor from the A-Neutronics, to show what it uses inside.

I extended the dipole bar, and open the reflector cup.

All but one of the pre-transition stations came in. It would probably come in once I put the antenna in the attic.

Some pixelation occurred, but that's because:
I had 2 computers running in the same room as the antenna
There are 2 500 GB external hard drives running at 80% full capacity by the computers
Antenna was mounted 4 feet off the ground
There is a garage door 15 yards in front of the antenna
There's a digital radio clock running 6 inches behind it
The creator-autographed Naked Mole Rat on top of the radio clock is running interference

As for low-power stations, not seen in the test... they come in okay.

One more thing I haven't tested yet: I hope the remote control receiver box does not share the same fault I found with the A-Neutronics control box: The rotation motor control box reacted to a laptop's IrDA transmitter in "broadcast" mode. That means when the laptop was "broadcasting" in infrared, the A-Neutronics antenna jiggled around like it had a nervous tic. It frightened me at first until I found out what was going on.

Want more hardcore raw tests like this? Let me know.
Hello all! First post here. Question for the OP, how far away are you from the broadcast towers? I have been exploring the little amplified rotating antennas before I make my move and some specs say way more than I believe. I am high on a hill and want to receive stations ~85 miles away. Nothing available locally around here so overload will not be an issue.

I currently have Dish Network but I only get the "Big 4" plus The CW via LiL in HD on the dish. I wanted to complement this service with all the HD plus the digital subs I could get. My receivers could actually add all these channels into my Dish programming guide.

Again, to the OP, how far away are you from the broadcast towers?
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Old 06-28-2009, 07:22 PM   #12 (permalink)
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If you measure an antennas performance in miles you will often be fooled and disappointed. There are so many other factors in antennas that the mile maybe 40 miles for one person and 20 for the next the box will always read some crazy huge number like 100 miles.
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Old 06-28-2009, 07:50 PM   #13 (permalink)
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If you measure an antennas performance in miles you will often be fooled and disappointed. There are so many other factors in antennas that the mile maybe 40 miles for one person and 20 for the next the box will always read some crazy huge number like 100 miles.
All that you say is true for the most part. But wouldn't you say my question is a start? I am not saying one question + one answer = one solution. I am looking for input. I am exploring.

But hey little Piggie. Nice to meet ya.
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Old 06-28-2009, 09:30 PM   #14 (permalink)
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Hello all! First post here. Question for the OP, how far away are you from the broadcast towers?
Yes, sir, yassuh! According to my TVFool plot, the channels that I receive well are in the "green zone," at the 2-3 degree mark. 30 miles away, pretty much.
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Old 06-29-2009, 03:55 AM   #15 (permalink)
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The towers there are 560 meters above sea level and the valley isn't a long way above sea level in comparison. So in terms of TV reception the coastal plains of LA are nearly perfect for TV reception.

The look down angle from a mountain transmitter's range is much better than one on a tower in relatively flat terrain that has to deal with obstacles in it's path, such as tall buildings and foliage.

Every location requires different styles of antenna is my point. What works great in one town won't in the next.
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Old 07-11-2009, 10:48 PM   #16 (permalink)
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Hello everyone.

Thanks for the excellent review and video Divx!

Ive been interested in info on those rotating chinese antennas. The one Lava ANT-104 just commented on was 1 of 2 or 3 similar style antennas that I was checking out.

I have the Quantum FX indoor antenna and its performing similar to the Radio Shack 1880.....very well. Recommended.

I also have the A-Neutronics AV-891 on the way. Id be interested in your review and comments on it Divxhacker, when you get it. I really enjoyed your video on the OP antenna and have posted a link to it on AVSforum in the Indoor Antenna thread.

Till tommorrow.



Lava 2065

Youtube Video





Lava 2805






Youtube Video






No name given

Quote:
Frequency: 45 - 860 MHZ
Turning Degree: 360
Impedance: 75 Ohms
Wavelength: < 1,5
Gain: 25 - 35dB
Reception Range: 50 miles or more (Reception Distance estimate is based on line of sight open terrain factors)
Infrared Remote Control
VHF/UHF
Weight: 5 lbs.
NOISE REDUCTION
ULTRA SHARP
Infra-Red Remote System
45 Feet "F" type COAXIAL CABLE NOTE: You can add more coax if you need a longer run
Measurements : 29" Long X 26" Wide X 18.5" Depth

The last 2 were the ones I was considering acquiring and testing....which look like they might have a more substantial build quality (rotor housing looks robust and who would have thunk it ROUND!)....at least more robust than the others there.

There is also this crazy looking thing....

Youtube Video

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Old 07-11-2009, 11:28 PM   #17 (permalink)
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NRA "Nitro" 3000




Here is the A-Neutronics AV 891 I have on the way. Looks promising with dual loops like the RS 1880, ClearStream2, and the Quantum FX indoor....plus reflector screens (and a bit further back than the table top models perhaps? that would be good I think). Concerned about the sizing (Ive been fooled by pics before).....and the rotor looks weak, amp mounted at balun box? We'll see.



I also have a Cornet ET-8DA here currently...havent really gotten it out and messed with it yet.....which is a lot like the Terk HDTVo....with log periodic UHF elements and fold out VHF folded dipoles. Should work well.


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Old 07-12-2009, 10:02 AM   #18 (permalink)
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Id be interested in anybodies comments on those antennas.

What are the driven elements?

Its tough to see the jumper feedlines.

It looks like the Nitro 3000's active elements are the longer aluminum tubes on the top and bottom on the frontside with a bunch of smaller directors in front of it........and the large VHF (High) dipole towards the rear. And it has a rounded corner reflector with a focus at where (on VHF frequencies? and on UHF frequencies?)

Is this a stacked UHF antenna combined with a VHF dipole all in front of a parabolic corner reflector?

Fascinating!

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Old 07-12-2009, 10:10 AM   #19 (permalink)
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The No Name Antenna, looks to have the large VHF (High) dipole driven and combined with the middle sized UHF driven dipole with 5 smaller directors in front of it. Plus the VHF dipoles acts as a reflector as well and the mesh screen is reflecting UHF as well. And a decent looking rotor.

Seems like a somewhat sensible reasonable setup.

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Old 07-12-2009, 10:16 AM   #20 (permalink)
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Piggie said this about the Lava ANT 104:


Quote:
This antenna is based on better antenna theory. it uses folded dipoles for directors and has 7 of them.

I am not too sure why they are using 2 folded dipoles for driven element (the ones broken in the middle with red caps. Unless it has a 2:1 balun because 2 folded dipoles in parallel would be about 150 ohm.

Then it has a VHF reflector. This antenna should have about 4 to 5 db on UHF and 2 to 3 on VHF.

I can't see where it says amplified which would be good for those that don't need an amp.

I might make a good attic antenna for someone that didn't need more than just a tiny bit more gain than rabbit ears.

However 50 ft of coax if hooked to it would just about kill the gain out of it if its not amplified.

$20 makes it the right price also to compete against antennas built to be outside for years. I am not sure how long the plastic mount or rotor would last.

Note: The Cornet ET-8DA above.....the fold out VHF dipoles are plastic housings (presumably with some wire in there somewhere. This Lava ANT-104 is likely to be similar.....ie....those fold out dipoles and reflectors are NOT aluminum tubing but plastic with some metal in there somewhere.....Im guessing. Though from this video it looks like they may be aluminum.

http://www.youtube.com/watch?v=3hOo6...eature=related

I noticed that fellow customized his antenna, adding a length of aluminum tubing to his UHF dipole as well.

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