User's Manual

Guide to the SRX800 Receiver Preliminary
1)CO N F I G ## > 2)SC A N SE T T I N G S
UN D E R S T AN D I N G SC AN CY C L E S
A Scan Cycle is the time it takes for the receiver to scan all frequencies on all
antennas/hydrophones in the specified scan order. The amount of time a scan
cycle lasts depends on the number of frequencies and antennas/hydrophones,
the scan time, and the Total Scan Time. It also depends on two additional
features: Time-Out on Acquisition (TOA) and Master Antenna Preview.
Frequencies and antennas (radio antennas and hydrophones) are scanned in
the order they are entered into the receiver. This is referred to as the Scan Order.
The only conditions that can terminate a scan cycle are stopping data
collection, battery failure, or if all available memory is filled to capacity.
The Total Scan Time is the maximum amount of time a complete scan cycle can
take, but the actual time to complete a scan cycle can be less than this, because
other settings, like TOA, may cause the receiver to adjust the scan time.
If a scan cycle takes less than the calculated total scan time, then the receiver can
be set up to wait until the total scan time has elapsed before starting another scan
cycle. Setting the total scan time allows multiple receivers to synchronize their
scan cycles. It is a power-saving option—the receiver shuts down all antennas
and lowers their gain while it waits for the total scan time to elapse.
If the receiver is not actively scanning, it shuts down all antennas and lowers
their gain to save power.
SE L E C TI N G A CO D E SET
A transmitter code is made up of four pulses that define three pulse intervals.
The time between repetitions of the code is called the Burst Interval. A pulse
interval is the period of time that elapses between two consecutive pulses in a