Edgetech 4380 MULTIBEACON, User Hardware Manual

Page: 21 / 39

3-1
SECTION 3: SETUP AND ACTIVATION
This section describes how to configure and activate the 4380 multi-beacon.
3.1 Pre-deployment
The following sub-sections describe considerations and setup before deploying the unit.
3.1.1 Calculating the Duration of Deployment
Before deploying the unit, use these calculations in order to figure out the amount of battery life available
for the mission:
i. The Lithium Ion battery packs, when fully charged and in fresh condition, provide 30 Watt-hours
of energy (2.0 A-Hr).
ii. The energy used per reply is the product of the transmit power and the pulse length, (e.g., 150 W
into hemispherical acoustic projector consumes 1.5 Watt-seconds of energy, or .00042 Watt-
hours of energy for a 10mS PRN coded reply).
# OF PINGS 1.5 mS CW PULSE 10 mS PRN CODED PULSE
SOURCE LEVEL LOW HIGH LOW HIGH
Omnidirectional
transducer 400,000 175,000 70,000 25,000
Directional
transducer 350,000 125,000 55,00 18,000
Table 3-1: Number of Pings Based on 2-Second Interrogation Interval.
iii. The quiescent (standby) power for the transponder receiver is .0045 Watts.
The quiescent power when operating in responder mode is 0.15 Watts.
3.1.1.1 Battery Life Equations & Examples
P = # of seconds between replies
H = # of hours of operation
For Transponder operation with Omni Projector:
( eq.1 ) H hours = 30 Watt-Hours / (.0045 + 1.5/P)