n4voxgill
Silent Key
On June 20, 2005, FCC Commissioner Jonathan Adelstein gave a speech on Software Defined Radios (SDR) and Cognitive Radios (COG).
SDR is not being pursued because of they are programed with a computer. SDR appeal is that it can have many modes and functions and switch between them. A SDR radio will talk on a trunked radio system with one transmission, then switch to 1.9 GHz and be a cell phone. It will work as a modem connected to a printer to receive a fax. It will almost never become obsolete as it can be modified so easy.
COG is unique as you don't have to program in frequencies, in fact you don't even need assigned frequeancies. A COG radio will find any unused frequency when keyed. It will detect the lowest power setting required to maintain the connection. This permit reuse of frequencies and reduce interference. A COG radio will surrender a frequency and go in seek mode if a higher priority user's COG needs the frequency. This means you can have business and public safety all using the same blocks.
Hook the two together and you will have a radio that may make one transmission on 45 MHz, then next on 4.9 GHz. One transmission may be voice and then it will receive a photograph. Uses are only limited by imagination.
You can read Commissioner's speech at:
http://hraunfoss.fcc.gov/edocs_public/attachmatch/DOC-259417A1.pdf
SDR is not being pursued because of they are programed with a computer. SDR appeal is that it can have many modes and functions and switch between them. A SDR radio will talk on a trunked radio system with one transmission, then switch to 1.9 GHz and be a cell phone. It will work as a modem connected to a printer to receive a fax. It will almost never become obsolete as it can be modified so easy.
COG is unique as you don't have to program in frequencies, in fact you don't even need assigned frequeancies. A COG radio will find any unused frequency when keyed. It will detect the lowest power setting required to maintain the connection. This permit reuse of frequencies and reduce interference. A COG radio will surrender a frequency and go in seek mode if a higher priority user's COG needs the frequency. This means you can have business and public safety all using the same blocks.
Hook the two together and you will have a radio that may make one transmission on 45 MHz, then next on 4.9 GHz. One transmission may be voice and then it will receive a photograph. Uses are only limited by imagination.
You can read Commissioner's speech at:
http://hraunfoss.fcc.gov/edocs_public/attachmatch/DOC-259417A1.pdf
