2007

• 2007-03-11 – Radio Trunking system PTT Latency and Overloading Part 2

2005

• 2005-05-23 – Radio Trunking system PTT Latency and Overloading Part 1

2001

• 2001-02-13 – Maximize trunking system via modulation level tuneup

1998

• 1998-02-05 – Full duplex 800 MHz SMR telephone