A more effective discard mechanism for Selective Repeat ARQ is achievable, where the discard mechanism exhibits a sender-initiated discard signaling scheme. In an embodiment, the oxidation product comprises an oxide of the metal fuel which is doped degenerately. The signal obtained by the photoelectrical conversion is sent to a controller 9. The ammunition containers can be ammunition belt boxes. According to the invention, the coil tapers toward the insulator. Additionally, the method includes selecting a cluster from the clusters of RSTD estimates.