Figure 4-2. Radio set, AN/VRC-47 (secure).
Figure 4-3. Radio set, AN/VRC-49 (secure).
4-3. Single-Channel Ground and Airborne Radio System
SINCGARS is the primary radio system used for short- range secure voice communications at brigade/battalion. SINCGARS is the secondary means for CS and CSS units.
SINCGARS is replacing all AN/PRC-77 manpack and AN/ VRC-12 series vehicular mounted and airborne VHF-FM radios. SINCGARS accepts either digital or analog input. It converts the signal into a FH output. In the FH mode, the radio's transmission changes frequency about 100 times per second. This prevents threat interception and jamming units from locating or disrupting friendly communications.
SINCGARS radios may "net" with the AN/VRC-12 series radios by operating in the single-channel mode. Additionally, the AN/VRC-12 series radios may operate within FH nets by using a SINCGARS-FH to single-channel (SC) retransmission system provided by an AN/VRC-92. Figure 4-4 shows an example of an SC to FH retransmission operation.
SINCGARS provides access into the ACUS network through the NRI. The NRI (KY-90) is the interface device which links the SINCGARS with the ACUS communications network. Normally, CNR users gain access through an NRI station located in either a SEN, FES, LEN, or NC.
See FM 11-32 for detailed information on SINCGARS.
Continue with Chapter 4
Table of Contents
Index
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