Frequency Plan

It is important to carefully plan the setup of your sensors before adding them to the system. You can create a table with a list of frequencies and complete it when you add sensors.

Frequencies and intervals

The diagrams below show the bandwidth of the different types of Marport sensors and intervals you must respect when adding other sensors.

Figure 1. PRP sensors (e.g. Catch sensor, Trawl Speed, Spread sensor...)
Example: If the frequency of the sensor is 40kHz, there should be no sensors between 39.9-40kHz and 40-40.1kHz.

Figure 2. Marport Pro sensors (e.g. Trident, Door Explorer, Trawl Navigator, Speed Navigator)
Example: If the frequency of the sensor is 40kHz, there should be no sensors between 39.8-40kHz and 40-50.2kHz.
Figure 3. NBTE sensors (e.g. Speed Explorer, Trawl Explorer, Catch Explorer, Catch Navigator, Door Sounder)
Example: If the frequency of the sensor is 40kHz, there should be no sensors between 39.8-40kHz and 40-40.6kHz.

Figure 4. HDTE narrow band mode

Example: If the frequency of the sensor is 40kHz, there should be no sensors between 39.8-40kHz and 40-41kHz.

Figure 5. HDTE wide band mode
Example: If the frequency of the sensor is 40kHz, there should be no sensors between 39.8-40kHz and 40-42.6kHz.

Frequency of the sensor Bandwidth Mandatory distance with other sensors Recommended distance with other sensors

Examples of frequency allocations

  • We recommend to allocate frequencies between 34 and 56 kHz for wideband hydrophones and between 41 kHz and 44 kHz for narrowband hydrophones.
  • Echosounders are usually placed around 38 kHz, make sure to allow enough distance with them.
Example of a system with Spread, Catch, Trawl Speed sensors and Speed Explorer, Catch Explorer, HDTE and Door Sounder.
Example of a system with Spread sensors with positioning, Catch sensors, Trawl Explorer and Catch Explorer.
Example of a system for purse seining, with a Seine Explorer and depth Seine sensors.
Bandwidth

Mandatory distance with other sensors

Avoid allocating frequencies between 37 and 39 kHz because this range is generally used by echosounders.