Menu description
93
850--164186 A
There is a selection between three different pulse lengths: short,
normal and long. In addition the pulse length will change
automatically in accordance with the selected range. The table
shows the different pulse lengths for CW and FM. The pulse
length in CW is given in milliseconds (ms).
FM (Frequency Modulation):
In the FM mode, the transmitter pulse is frequency modulated.
This provides a stable echo presentation and greater ability of
detection as noise and reverberation are reduced.
There is a selection between five different modes:
FM AUTO. - Chooses automatically the optional number of
frequencies (1 – 8) for the selected range.
FM1 - Transmits one-frequency pulse with a total pulse length of
1ms.
FM2: - Transmits two-frequency pulses with a total pulse length
of 4 ms.
FM4: - Transmits four-frequency pulses with a total pulse length
of 16 ms.
FM8: - Transmits eight-frequency pulses with a total pulse length
of 64 ms.
The selected number of frequencies are transmitted in one ping,
and the receiver unit undertakes a spectrum analysis to compare
the received echoes with the transmitter’s frequency code. This
provides a filtering effect, where only “own echoes” are
displayed, and noise and other echoes are reduced. The table on
thepreviouspageshowsthemaximumFMmodeforallranges.
The maximum FM mode will automatically be selected when
using FM AUTO.
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