The UHR upgrade requires a unique projector, which covers the normal 200 – 400 kHz frequency
range, but can also provide the necessary power to operate at 700 kHz. The projector is specially
labelled with a blue indicator on the end of the projector.
When 700 kHz is selected, the swath sector will automatically be reduced to 60°. The UHR upgrade
is intended for short range operation. In the UHR mode of operation, the across track beamwidth is
0.3° and the along track beamwidth is 0.6°: true Ultra High Resolution sonar.
5.5.1.2 UHR Operation Suggestions
When operating at the high 700kHz frequency it will be necessary to increase Power and Absorption
significantly (Absorption set to 200dB/km). Along with this will be a possible increase in Pulse
Length, Gain and Spreading Loss. As frequency increases so does the effect of attenuation and this
is why, when in UHR mode, the sonar operating settings need to be increased to increase the total
power going into the water and the higher gain needed to receive the attenuated signal. As stated
the UHR mode is for short range operation.
5.5.2 Ping Rate Limit
The Sonic 2024/2022 can transmit at a rate up to 60 Hz (60 pings per second), this is called the Ping
Rate. At times, it may be desirable to reduce the ping rate to reduce the collection software file size
or for other reasons. Highlight the box next to Ping Rate Limit and the ping rate limit drop down
box will be activated; select a predefined ping rate or enter a manual rate.
Figure 41: Ping Rate Limit
5.5.3 Sector Coverage
The Sonic 2024/2022 allows the user to select the swath sector from 10° to 160°. All 256 beams are
used, no matter what the selected sector coverage that is chosen. The smaller the sector, the
higher the sounding density is within that sector. Changing the Sector Coverage can be done on the
fly, with no need to stop recording data or to go offline.
Page 51 of 210
Version 5.0 Rev r002
Date 05-08-2014
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