A communication between a fixed base station and several mobile units, located on ships or aircraft utilising two way radio communication in the VHF and UHF is of frequency band

Options

A. 3 to 30 MHz
B. 30 to 300 MHz
C. 30 to 470MHz
D. 30 to 600 MHz

Explanation

To solve the question regarding the frequency band utilized for communication between a fixed base station and mobile units on ships or aircraft using two-way radio communication in the VHF and UHF range, we can follow these steps:

### Step 1: Understand the Definitions
- **VHF (Very High Frequency)**: This frequency band generally ranges from 30 MHz to 300 MHz.
- **UHF (Ultra High Frequency)**: This frequency band typically ranges from 300 MHz to 3 GHz.

### Step 2: Identify the Frequency Range for Communication
- The question specifies that the communication involves VHF and UHF bands. Therefore, we need to consider the lower limit of VHF and the upper limit of UHF.

### Step 3: Determine the Combined Frequency Range
- Since VHF starts at 30 MHz and UHF ends at 470 MHz (as per the information provided in the video), we can conclude that the frequency range for the communication system in question is from 30 MHz to 470 MHz.

### Step 4: Finalize the Answer
- Based on the analysis, the frequency band for the communication between the fixed base station and mobile units is from **30 MHz to 470 MHz**.

### Final Answer:
The frequency band utilized for two-way radio communication between a fixed base station and several mobile units located on ships or aircraft is **30 MHz to 470 MHz**.

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