Posts tagged ‘antenna’

Lock Your Car Better With Your Chin

By Chad Upton

I think everybody has done it. You’re walking away after parking your car and you can’t remember if you locked it. You turn around to lock it and you’re too far away – or – maybe your car has remote start and you want to warm it before you leave work in the winter. You can see it in the parking lot, but you’re too far away.

There is something that may help.

If you push the car remote against your skin, and then press the button, your body will act like a giant antenna to extend the signal. I don’t know how safe this is, but it works.

I first heard about this a few years ago and I was in disbelief, until I tried it. Not only does it work, according to New Scientist, it can almost double the range of your key fob.

When I first heard about it, I was told to push it against my chin. It turns out you can push it again your arms or other body parts too. It relies on a principle called capacitive coupling, the same principle that the capacitors on electronic circuit boards rely on.

This doesn’t work for all types of radio frequency remotes, it works best with relatively low frequency signals with rapidly changing currents, which is what many car remotes use.

You may have heard that the iPhone 4 is having signal issues when the exterior antenna is touched in a certain way and you may be wondering why it has the opposite affect on the iPhone. The difference between the iPhone problem and capacitive coupling is that there is no insulator between the transmitter and your body with the iPhone, but with your car remote, the plastic case acts like an insulator. Again, this is precisely how capacitors on circuit boards work — two conductors are separated by an insulator.

It should be noted that some car remotes may use a different frequencies and types of signals, so you’ll have to test yours to see if it works for you.

Big thanks to Max Surguy for reminding me about this one, such a great tip!

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Sources: New Scientist

Photo: nailkennedy (cc)

July 9, 2010 at 5:00 am 5 comments

How to Get Free HDTV Channels

When I say free, I don’t mean free with your paid cable or satellite package.  I mean 100% free without paying for any service.

When television broadcasting began in North America, the broadcasts were completely free. The costs associated with producing TV were covered by program sponsors (advertisers). TV signals were received over the air, so all you needed was a television and an antenna (aka “rabbit ears”). This worked great at the time because TV was new and nobody knew if it was going to be successful; laying cable to distribute signals didn’t make any sense and satellites weren’t an option yet.

Once television was a proven success, viewers wanted more content on bigger and better televisions. Today, those demands haven’t changed, but the technology has.

Receiving signals over the air was not perfect, there were a limited number of channels that could fit in the airwaves. Reception was spotty, but Cable and Satellite services came along with more channels and reliable signals that didn’t require any adjustments.

The technology has changed again. The development of digital signals has allowed broadcasters to fit many channels in the same space that used to only fit one channel. Although it caused a lot of disruptions in June of 2009, the United States ceased all analog TV signals within a specific frequency range. That means the once crowded airwaves are much more useful with digital signals that can stuff more channels in the same space.

Some broadcasters have been distributing their television signal over-the-air for more than 50 years and they continue to do so, now in digital. The secret to picking up these free channels: rabbit ears.

Seriously.

To many people, this will sound like a huge step back, and in some ways it is. You’re not going to find John and Kate or Jersey Shore on the free channels, but it could be worse: you might find John and Kate or Jersey Shore on the free channels.

If you’re on a budget; or you only watch the most popular network shows; or you want to stick it to the cable-man; or you want to pickup really good HD signals on a TV without a cable box or satellite receiver, then this is an option to consider. In many cases, digital over-the-air signal quality rivals cable and satellite signals, where signals are highly compressed because of bandwidth limitations.

Digital rabbit ears are much better than the coat hangers of the past — if you’ve upgrade to a digital cordless phone in the past couple years, you’ll understand the difference in reception, reliability and clarity that digital signals offer.

Depending on where you live, your channel selection will vary. In some places, you can get 10+ HD channels and dozens of standard digital channels, all for FREE! If you live in the United States, you can enter your zipcode in AntennaWeb’s search engine to see a list of the channels you should receive. In many places, you should get most (or all) of your favorite prime time shows in free HD. All you need is an HDTV, an ATSC tuner (most HDTVs have one built in) and an antenna. Here are some examples of affordable indoor and outdoor antennas that you can buy.

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Photo: Dano (cc)

January 5, 2010 at 1:27 am 14 comments


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