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Search: Posts Made By: BrookeEngineer
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Forum: Rumours & News
7th Apr 2014, 21:17
Replies: 11,831
Views: 24,239,494
Posted By BrookeEngineer

Hydrophones etc

The input frequency is translated to something you can hear.

The PSR-1 VIetnam era seismic intrusion detector has input frequency that's well below human hearing and shifts that up. When you...
Forum: Rumours & News
7th Apr 2014, 01:26
Replies: 11,831
Views: 24,239,494
Posted By BrookeEngineer

Spread spectrum underwater location beacon system...

Spread spectrum underwater location beacon system (https://www.google.com/patents/US4951263)
Includes transponder mode to activate pinger.
The process gain in a spread spectrum system can easily be...
Forum: Rumours & News
29th Mar 2014, 01:45
Replies: 11,831
Views: 24,239,494
Posted By BrookeEngineer

141 Battery Incidents 20 March 1991 to 17 Feb...

141 Battery Incidents 20 March 1991 to 17 Feb 2014

http://www.faa.gov/about/office_org/headquarters_offices/ash/ash_programs/hazmat/aircarrier_info/media/battery_incident_chart.pdf

I remember...
Showing results 1 to 3 of 3


 
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