Radio propagation

#1. The process which causes the reduction in signal strength as range from a transmitter increases is known as:

• Aabsorption
• Bdiffraction
• Cattenuation
• Dionisation

#2. Which of the following will give the greatest surface wave range?

• A243 MHz
• B500 KHz
• C2182 Khz
• D15 MHz

#3. It is intended to increase the range of a VHF transmitter from 50 nm to 100 nm. This will be achieved by increasing the power output by a factor of:

• A2
• B8
• C16
• D4