# Red

> A 25 kHz drifting-boat channel recorded near Singapore in November 2024, over a 100-400 m range with a 3-element vertical array and impulsive ambient noise.

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LLMS index: [llms.txt](/llms.txt)

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* Experiment:
  * Location: Singapore
  * Date recorded: November 2024
  * Center frequency: f<sub>c</sub> = 25 kHz
  * Bandwidth: B = 9.6 kHz
  * Symbol rate: R = 9.6 ksym/s
  * Distance: d = 100-400 m
  * Tx/Rx/water depth: d<sub>T</sub>/d<sub>R</sub>/d<sub>w</sub> = 6 m/4.6 m/8-20 m
  * Mobility: drifting
  * Receiving array: vertical, M = 3 elements, &#8467; = 0.8 m spacing (numbered top to bottom)
* Parameters:
  * Sampling rate in delay: f<sub>s</sub> = 2R
  * Total delay coverage: up to 40 ms
  * Sampling rate in time: R/100 for the channel response, 2R for the phase/delay
  * Total time coverage: 50 seconds