Search results
Results from the WOW.Com Content Network
Invisible Fence Inc. (commonly referred to as Invisible Fence Brand) is a company that designs radio pet fences for cats and dogs. Manufactured and distributed by Radio System Corporation, the company sells wireless and fenceless systems that were first introduced in 1973. [ 1 ]
A pet fence or radio fence, is an electronic system designed to keep a pet or other domestic animal within a set of predefined boundaries without the use of a physical barrier. A mild electric shock is delivered by an electronic collar if its warning sound is ignored.
Encoder receiver transmitter (ERT) is a packet radio protocol developed by Itron for automatic meter reading. [1] The technology is used to transmit data from utility meters over a short range so a utility vehicle can collect meter data without a worker physically inspecting each meter. The ERT protocol was first described in U.S. patent ...
We’ve all been there. It’s 2 a.m. and you hear an eardrum-piercing beep. Your first reaction is to cover your head with a pillow and ... Read moreHow to reset a smoke alarm that won’t stop ...
A pager, also known as a beeper or bleeper, [1] is a wireless telecommunications device that receives and displays alphanumeric or voice messages. One-way pagers can only receive messages, while response pagers and two-way pagers can also acknowledge, reply to, and originate messages using an internal transmitter.
Overview diagram of COSPAS-SARSAT communication system used to detect and locate ELTs, EPIRBs, and PLBs First generation EPIRB emergency locator beacons. An emergency position-indicating radiobeacon (EPIRB) is a type of emergency locator beacon for commercial and recreational boats, a portable, battery-powered radio transmitter used in emergencies to locate boaters in distress and in need of ...
Bose's millimeter wave spectrometer, 1897. The spark transmitter is inside the box (R). The galena detector is inside the horn antenna (F) with a thumbscrew (t) which adjusted the pressure of a metal point against the crystal. The battery (V) creates a current through the detector measured by the galvanometer (G)
To get the voice signal to the remote transmitter, dedicated telephone lines connected these stations to Houston. NASA could either build a parallel system for operating the transmitters—one line to carry the audio and another to carry the control signal for the PTT button ( out-of-band signalling )—or combine these two systems together ...