Defining The Frequency Sweep (Chirp) Within Each Transmission - Simrad ES80 Reference Manual

For CW transmissions:
• Long pulses provides longer detection range. They make the ES80 less sensitive for
noise, but offer lower range resolution.
• Short pulses provides shorter detection range. They make the ES80 more sensitive for
noise, but offer higher range resolution.
For FM transmissions:
• Long pulses provide longer detection range, but offer lower range resolution.
• Short pulses provide shorter detection range, they make the ES80 more sensitive for
noise, but offer higher range resolution.
Tip
When you select
Auto
current operational mode, depth and bottom conditions. For normal use, we recommend
that the pulse duration is set to Auto.
Procedure
1 Open the
Operation
2 Select
Normal Operation
Observe that the
3 For the relevant channel, set
4 Select to save the selected setting and close the dialog box.
OK
Defining the frequency sweep (chirp) within each
transmission
The ES80 supports wideband transmissions using frequency sweeps. This is often
referred to as "chirp", and means that the transmission frequency changes from a "start"
frequency to an "end" frequency within the transmission. In order to use the frequency
sweep ("chirp") functionality, you must use frequency modulated (FM) pulses. You must
also use a wideband transducer that supports the complete frequency range.
Context
The
Start Frequency
("chirp"). If the parameters for start and end frequencies are unavailable, the transducer
used on the relevant channel does not support wideband transmissions. In order to use the
frequency sweep ("chirp") functionality, you must use frequency modulated (FM) pulses.
406273/C
, the ES80 will automatically select the best pulse duration for the
menu.
.
dialog box opens.
Normal Operation
Pulse Duration
and parameters are used to set up a frequency sweep
End Frequency
Operating procedures
to your chosen value.
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