SINCGARS Frequency Hopping operates in which frequency range?

SINCGARS Frequency Hopping operates in which frequency range?

• A. 90.0000 MHz to 224.9999 MHz
• B. 225.0000 to 511.9999 MHz
• C. 30.0000 MHz to 87.9750 MHz
• D. 30.0000 MHz to 511.9999 MHz

Answer: (C)

Frequency hopping works by rapidly switching across a defined set of frequencies to hide the transmission and resist jamming. For SINCGARS, that set is within the VHF FM band from 30.0 MHz up to 87.9750 MHz. This range is chosen because VHF offers good line-of-sight propagation and manageable antenna size for field equipment, while hopping across channels in this band makes interception and jamming much harder. Frequencies outside this band—whether higher in the UHF region or spanning beyond 87.9750 MHz—aren’t part of the SINCGARS hopping scheme, which is why those other ranges aren’t correct.

Frequency hopping works by rapidly switching across a defined set of frequencies to hide the transmission and resist jamming. For SINCGARS, that set is within the VHF FM band from 30.0 MHz up to 87.9750 MHz. This range is chosen because VHF offers good line-of-sight propagation and manageable antenna size for field equipment, while hopping across channels in this band makes interception and jamming much harder. Frequencies outside this band—whether higher in the UHF region or spanning beyond 87.9750 MHz—aren’t part of the SINCGARS hopping scheme, which is why those other ranges aren’t correct.