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Up to 50% Off on Garage Door Repair at Jtm Garage Door Service

JTM Garage Door Service
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charyl
3 years ago
Adam was on time and very proficient. He explained all to me and answered all my questions. I will call them again. Thanks for the conversation and teaching me more about garage doors!!

Highly Trained and Certified Technicians 28 Pt Safety Inspection Lube & Tune up on Door and Opener Licensed Bonded Insured Full Warranties

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If you find a better price somewhere else, let us know. We’ll cover the difference, worry free. See full details at gr.pn/bpg

Choice Of:

  • Garage Door Lube and Tune-Up with Safety Inspection
  • Garage Door Lube and Tune-Up with Roller Replacement and Safety Inspection

Garage-Door Openers: Signaling Security

Learn a little about the technology inside the little remote in your car with Groupon's examination of garage-door openers.

In 2012, garage doors throughout southeastern Connecticut mysteriously seized up. The culprit? A military submarine base.

Annoying as it may have been, there was nothing sinister behind this pattern. Rather, it was simply a side effect of the way all remote-entry garage-door systems are designed. Each time you open or close a garage door, the remote and the receiver inside have a brief conversation in code—a conversation that happens to be conducted via radio signals over the airwaves. The unfortunate homeowners in Connecticut eventually learned that the signal emitted from the submarine base’s radio-communication system shared a frequency with their garage-door systems, and the more powerful military signal drowned out the information their remotes were trying to transmit.

The codes transmitted by garage-door remotes have gotten far more complex over time. As early as the 1960s, burglars learned to use radio scanners or “code grabbers” to pick up the code when the homeowner used it to open the door; they could then re-transmit the code to gain entry themselves. In response, most remotes today use rolling codes that can generate billions of combinations.

This is possible because each time a message is sent between remote and receiver, each part of the system also selects and stores a new code. Those codes will always be in sync because each has been programmed with the same pseudo-random number generator—that is, a formula that produces a sequence of numbers that would appear random to anyone not possessing the formula. (Beware, however: it is possible to desynchronize the system by pressing the remote button out of range of the opener more times than the system’s built-in tolerance for error will permit.) Once this is done, the remote and receiver are ready to kick the system's motor into gear and help you begin or end another day on the road.

Need To Know Info

Promotional value expires 90 days after purchase. Amount paid never expires. Appointment required. Valid only within 20 miles of zip code 85117. Limit 12 per person. May be repurchased every 365 days. Limit 1 per visit. Limit 1 per household. Valid only for option purchased. Merchant's standard cancellation policy applies (any fees not to exceed voucher price). Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services. Learn about Strike-Through Pricing and Savings

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