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For years, garage door openers automatically reversed when they struck an object; the beam sensor provides extraMy first response was to disconnect the beam sensor. That's when I read: "It's the Law: Garage door openers must be provided with an external entrapment protection system such as aauto glass repair great falls mt 'beam sensor' to help protect against entrapment between thelowes garage doors openers prices bottom of the garage door and the floor. solid core wood door slabTHIS SYSTEM CAN NOT BEgarage door repair 818 For Congress to mandate this kind of safety equipment is nothing short of bureaucratic

are so timid, gullible and short-sighted, Congress, egged on by busybody interest groups, gets away with micro-managing ourYou say, "What's wrong with you, Williams, there's no such thing as being too safe. If beam sensors save just one American life, it's worth it!" I agree that people should take reasonable measures to protect both themselves and others againstWhat's reasonable precaution and what's negligence has been well established by common law. But what about the bromide: if it saves just one life, let's do it? If we did everything that saved lives, we'd do all manner ofFor example, we could save tens of thousands of lives by lowering the highway speed limit from 65 mph to 5 mph. Additional lives could be saved by a Federal Aviation Administration regulation mandating that airplanes not come within 200 miles of each other and requiring only one plane to be taxiing atThat would eliminate mid-air collisions and ground

Each year many children suffer traumatic, sometimes fatal injuries falling from trees. A law requiring safety nets under all trees would prevent such mishaps. I know that you're saying, "Williams, you're being ridiculous!" Let's examine your claim with a couple of simple questions. Do you deny that a 5 mph speed limit would virtually eliminateI don't believe any reasonable person would denyNext question: if you accept the principle "if it saves just one life", why wouldn't you support a 5 mph speed limit law? You can hem and haw all you want, but your rejection of a 5 mph speed limit boils down to: the lives saved by a 5 mph speed limit wouldn't be worth the inconvenience. In other words, there's a tradeoff between safety, saving lives and everything else. A case can be made for certain safety regulations such as speed limits and other traffic safety measures because one person's actions can cause harm to another. garage door regulations are beyond the pale.

It's up to me to decide the level of safety for my family and me, not WashingtonProfessed concern about safety is little more than a Trojan Horse for tyrants and their useful idiot accomplices to By the way, my solution for the garage door opener beam sensors was to tape the light beams together, so they're "looking at" one another, and put them on the shelf.My new favourite toy is a cheap $20 USB TV tuner. It’s made to receive DVB-T signals, which aren’t even used in North America. So what use could I possibly have for it? Back in February, Linux kernel developer Antti Palosaari discovered that certain USB TV tuners can be configured to send the raw, unprocessed radio signal straight to the computer for decoding in software. (They use this mode when tuning FM or DAB radio signals. Think of it as the Winmodem approach to radio.) Palosaari realized that by running the right software, almost any radio signal could be received by these tuners. Not long thereafter, the RTL-SDR project was born, allowing these tuners to be used in Linux.

I should note that receiving (and transmitting) radio signals in software is nothing new. Software-defined radio has been around for years, but the hardware required (such as the Ettus Research USRP has generally been expensive. The availability of a $20 software-defined radio receiver has truly opened up the world of radio to anyone who takes the time to learn. Since getting my hands on a compatible TV tuner, I’ve been able to listen to police radio, pager networks, garage door openers, air traffic control, and lots more. I recently tweeted that I had succeeded in tracking the aircraft in my area by using my TV tuner as an ADS-B receiver and feeding the output into Google Earth. This caught the interest of a pilot friend of mine, so I thought I’d put together a tutorial for anyone interested in capturing these signals. Although the tutorial is specific to ADS-B, keep in mind that the software tools (and in particular GNU Radio) can be reconfigured to tune in virtually any radio signal.

So let’s get started! Purchase a USB TV tuner based on the Realtek RTL2832U chip. For best results, choose one that uses the Elonics E4000 tuner, which will let you tune in the widest range of frequencies, from 64 to 1700 MHz. The OsmoSDR site has a list of supported hardware to get you started. I chose the Newsky TV28T tuner, which I purchased from Aliexpress. (I paid 40 USD for two tuners, shipping included.) If you’re not running it already, download and install Ubuntu Desktop 12.04 LTS. I would recommend using the 64-bit version. Install all the available Ubuntu software updates using Update Manager and restart. Download, build and install GNU Radio using the build-gnuradio script. This can be done in a terminal window by running the following commands: Note that GNU Radio is quite a large piece of software and has a lot of dependencies, so the install process can take a long time. Download, build and install gr-air-modes. This is the piece of software that knows how to decode the ADS-B signals that many planes transmit.

In a terminal window, run the following commands: Plug in your TV tuner, and check whether you can receive ADS-B traffic by running the following in a terminal window: If it works, you should see output like the following:Type 11 (all call reply) from c0636c in reply to interrogator 0 with capability level 6Type 17 BDS0,5 (position report) from c078b2 at (45.199942, -75.541590) at 30050ftType 11 (all call reply) from c078b2 in reply to interrogator 0 with capability level 6Type 17 BDS0,9-1 (track report) from c078b2 with velocity 443kt heading 259 VS 1664Type 17 BDS0,5 (position report) from c078b2 at (45.199616, -75.544069) at 30075ftType 17 BDS0,5 (position report) from c078b2 at (45.199265, -75.546504) at 30100ft We’re already seeing some GPS coordinates and altitudes! Press CTRL-C to stop it for now. If you don’t see any traffic, try going outside for better reception. To see the output in a more convenient form, we’ll use Google Earth. Download the 64-bit .deb version from the download page, and open the file to run the installer.

For nicer-looking fonts in Google Earth, install the xfonts-75dpi and xfonts-100dpi packages by running the following in a terminal window: sudo apt-get install xfonts-75dpi xfonts-100dpi Then log out and log back in so the new fonts will get loaded. If Google Earth fails to launch, it may be because it can’t find libGL. (This happened on one of my two laptops.) To fix it, run the following command in a terminal window: sudo ln -s /usr/lib/i386-linux-gnu/mesa/libGL.so.1.2 /usr/lib/libGL.so.1 Run uhd_modes.py again, this time telling it to write its output to a KML file, the format used by Google Earth. In a terminal window, run the following: In Google Earth, select “Network Link” from the “Add” menu. Enter “Planes” in the “Name” field, then click the Browse button next to the “Link” field and choose the “planes.kml” file in the file chooser. Click on the “Refresh” tab and set a time-based refresh to occur periodically with a frequency of 5 seconds.