TDMA, or Time-Division-Multiple-Access is a very effective way of allowing a lot of radios to share one radio channel.  Used extensively in GSM cellular and APCO public-safety systems, TDMA excels at allowing quick and reliable access to radio channels.  Raveon’s M7 series of GPS tracking radios use TDMA to send GPS position information, status, and [...]

Raveon Technologies data radio modems can have either wide band IF filters, which are used on 25kHz or 30kHz spaced channels, or narrow-band IF filters, which are used on 12.5kHz spaced channels. 

As the picture above illustrates, it is possible to have twice the number of radio channels, when everyone uses 12.5kHz narrow band radios. 
So, why [...]

Wireless SCADA
In a traditional wired SCADA system, a device is monitored by some type of computer or other human-to-machine interface.  The user may have something as simple as an LED indicator, or as complex as a computer server for the operator.  The human interface communicates to another electronic device that is remotely located at the [...]