10.4.3 User Manual Contents April 17, 2020
Firmware: 5.2.1 Page 68 of 142
7.2
Frequency Separation
For dual head sonar operation, the transmit frequencies of the two sonars must not overlap. When
2 sonars are selected the NORBIT GUI automatically applies a frequency separation to the sonars.
This separation is determined in the following way. When a center frequency is selected that GUI
will choose a bandwidth, by default, of 40kHz. For instance, when 400kHz is used with the default
bandwidth of 40kHz, the sonars ping through a total frequency range of 360kHz-440kHz, with one
sonar pinging a range of 360kHz to 400kHz, and the second sonar pinging from 400kHz to 440kHz.
This allows the sonars to ping in sync without interference.
If you wish to change the frequency spread, you can do this by simply adjusting the bandwidth. The
closer you put the bandwidth to 80kHz the more frequency overlap will occur. If you desire to operate
the sonars individually you can simply unlink them. To control a sonar, click on the wedge associated
with the desired sonar and adjust the settings as required.
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