What are the MCB HI frequencies?

What are the MCB HI frequencies?

• A. 130.25 & 330.25
• B. 135.1 & 335.1
• C. 118.2 & 258.2
• D. 133.25 & 333.25

Answer: (D)

MCB HI frequencies use a cross-band pairing: a civil VHF frequency in the 118–136 MHz range paired with a corresponding UHF frequency in the 300–399 MHz range so both bands access the same channel. The VHF value must be a valid civil aviation frequency, and the UHF value should be the matching counterpart for that channel. 133.25 is a valid civil VHF frequency, and 333.25 is its UHF counterpart. They share the same channel designation across bands, which is why this pair is used for MCB HI. The other options either don’t represent valid or matching cross-band HI channels, so they don’t fit the standard pairing.

MCB HI frequencies use a cross-band pairing: a civil VHF frequency in the 118–136 MHz range paired with a corresponding UHF frequency in the 300–399 MHz range so both bands access the same channel. The VHF value must be a valid civil aviation frequency, and the UHF value should be the matching counterpart for that channel.

133.25 is a valid civil VHF frequency, and 333.25 is its UHF counterpart. They share the same channel designation across bands, which is why this pair is used for MCB HI. The other options either don’t represent valid or matching cross-band HI channels, so they don’t fit the standard pairing.