Abstract: An adapter (400) for a portable land mobile radio (LMR) transceiver system (414) where the LMR includes a push-to-talk (PTT) transmitter control system. The adapter includes a tip-ring-sleeve (TRS) type interface connector (402) configured to accept a plug (101) from a standard mobile phone headset. An adapter circuit (401) is configured to detect a momentary actuation of an answer/end switch (201) of a standard mobile phone headset when a TRS plug of the standard mobile phone headset is inserted in the interface connector (402). The adapter circuit alternately latches a PTT input of the LMR transmitter control system in either a transmit active state, or a transmit inactive state, in response to actuation of the answer/end switch of the mobile phone handset.

Abstract: An adapter (400) for a portable land mobile radio (LMR) transceiver system (414) where the LMR includes a push-to-talk (PTT) transmitter control system. The adapter includes a tip-ring-sleeve (TRS) type interface connector (402) configured to accept a plug (101) from a standard mobile phone headset. An adapter circuit (401) is configured to detect a momentary actuation of an answer/end switch (201) of a standard mobile phone headset when a TRS plug of the standard mobile phone headset is inserted in the interface connector (402). The adapter circuit alternately latches a PTT input of the LMR transmitter control system in either a transmit active state, or a transmit inactive state, in response to actuation of the answer/end switch of the mobile phone handset.

Abstract: A software-defined radio includes a pair of radio subsystems such as a red (command) and black (data) radio subsystem having an operating environment conforming to the Software Communications Architecture (SCA) specification, for example, as used for Joint Tactical Radio System (JTRS). A clock is read by at least one of the radio subsystems for determining time of day. A processor of the radio subsystem is operative for distributing the time of day to the radio subsystems using a global hardware timing pulse. Each processor can include a free-running timer to which any time sources within the pair of radio subsystems are set.

Abstract: A software-defined radio includes a pair of radio subsystems such as a red (command) and black (data) radio subsystem having an operating environment conforming to the Software Communications Architecture (SCA) specification, for example, as used for Joint Tactical Radio System (JTRS). A clock is read by at least one of the radio subsystems for determining time of day. A processor of the radio subsystem is operative for distributing the time of day to the radio subsystems using a global hardware timing pulse. Each processor can include a free-running timer to which any time sources within the pair of radio subsystems are set.