RTFM!
As a particular example, consider the bit allocations for message
type 1, an essential part of almost all FT4 and FT8 QSOs. These
basic messages usually contain two 28-bit call signs, an optional
acknowledgment R, and a four-character locator, signal report, RRR,
RR73, or 73. Table 1 shows that this message type consists of fi elds
with the tags c28, r1, c28, r1, R1, g15, and i3. The r1
fi elds are normally 0; the value 1 implies a /R call sign suffi x to
indicate “rover” status in a North American VHF contest.
4FQD是对的，以上内容摘自FT4 and FT8 Communication Protocol, /R后缀的含义是北美VHF竞赛中用来表示漫游（rover）状态。
