Wireless Trigger Box4

• One WTB 4, connected to the source, detects the trigger pulse from the source and then transmits it to the seismograph
• The second WTB 4, connected to the seismograph, receives the message from the source and starts the seismograph.

• Internal Radio Trigger Module (RTM)
• Internal 3 Watt VHF radio
• Internal 99 watt-hour rechargeable battery
• Internal GPS module

• The source WTB 4 can trigger multiple WTB 4 equipped seismograph
• The recorder WTB 4 can receive trigger messages from multiple WTB 4 equipped sources

Multiple source and seismograph systems can be deployed in 2D or 3D configurations.

Each Wireless Trigger Box 4 (WTB 4) unit must acquire a valid GPS lock from either the internal GPS or the optional external GPS unit. The Source WTB 4 is connected to the source with a hammer switch or other device and detects the switch closure (the falling edge) of the signal. The Source WTB 4 calculates the GPS time of the event, then transmits that GPS time and position of the event to the Recorder WTB4 units via VHF radio. The Source WTB4 also saves the GPS time and position of the event on the optional Removable Ruggedized Memory Plug. The Recorder WTB 4 receives the trigger time, then adds 1/2 second to it. The Recorder WTB 4 then sends a pulse exactly 1/2 seconds after the Source Trigger Time to trigger the seismograph. All seismographs then require a 1/2 second pre-trigger time offset to start recording.

• Removable External Memory: backs up time breaks at the source
• External GPS Module: To mount the GPS unit outside the source
• Internal Battery: 99.9 watt-hour LION (runs 24 hours depending on use)
• External 1/2 Wave Radio Antenna.: Extends radio range to 3 miles (depends on terrain)
• Navigation App: Allows Navigation and viewing of WTB4 status