ERF relay operation. An ERF signal will not automatically pass through a retransmit RT to an outstation. If possible, RT C
and D should have all required FH data before being taken to their site. RT A and C must have the same FH data. RT B
and D will have the same FH data. In the following example, RT A is the NCS, and RT D has the MODE switch set to
Before starting this procedure, make sure communication is possible between links.
NCS (RT A) tells RT C to break the retransmit link (set FCTN to LD) and to standby for ERF.
RT C sets FCTN to LD.
NCS (RT A) sends ERF to RT C; then RT C stores ERF, and changes MODE to FH-M.
RT C has RT D standby for FH update. e
RT D sets FCTN to LD and MODE to FH.
RT C sends FH update data to RT D; then RT D stores data (RT D must have same FH data as RT C to receive
RT C sets MODE to FH and FCTN to RXMT.
RT D sets MODE to FH-M, and has RT B stand by for FH update.
RT B sets FCTN to LD and MODE to FH.
RT D sends FH update data to RT B; then RT B stores data.
RT D sets FCTN to RXMT.
Retransmit operation is now possible.
Note: An option is for RTs C and D to take the ERF at the same time from station A
Then, RT D can ERF to station