Looking at MTTF and MTBF data, if the MTTF of a device is 20,000 hrs (say 100 devices are tested)does that mean we should expect one device to fail after 20,000 hrs out of a population of 100 or that the expected life of any individual it 20,000 hrs?
I am working on an RF based access control system. Small 13.56MHz transmitters are detected by a receiver/controller to grant or deny access to a doorway.
The problem is the 13.56MHz signal couples easily to metal surfaces and other wiring and re-radiates near the receiver triggering many...
Is it possible to create a loop antenna array to make loop antennas more omnidirectional? I would like to modify our current reciever. It consists of two loop antennas, one of which appears to be a parrisitic element. I would like an antenna that would be "more" omnidirectional. I...
