Also, how is an MTTF determined if you do not have a failure at the conclusion of your teting? It seems from the data sheets I have seen as they are just inserting a guess (on the first failure) into the equations and computing the MTTF based in this guess.
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?
The committment to RF has already been made, but we have thought of opto-isolation (IR) to bring the offending wires down to the controller (it is an expensive option). Transmitters output a 13.56MHz on/off keyed (data is the carrier) ID signal with a random delay. The purpose of the system is...
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...
The product as I inherited it is an 13.56MHz access control system. It is used in the care of dementia patients who have a tendancy to wander off (potentially into harms way). The system is comprised basically of a small transmitter worn by the patient and a receiver at facility exits. These...
I would like to supply more information and get your input. I am working with an on/off keyed signal so there is no baseband and rf we are only dealing with one frequency, 13.56MHz. I am not sure if array is the proper term when I am describing my idea. (I get the idea in an array the elements...
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...
