Insert pauses during broadcast interruptions

Hello, I am analyzing a FSK-modulated signal from a Claber rain sensor. The broadcast is interrupted at regular intervals by short breaks (6 ms) and one long break (20 ms). The demodulated data only shows one pause during the long break, but not during the short breaks. Is there a way to insert pauses during the short breaks as well? Currently, the short broadcast interruptions are interpreted as zeroes, which is probably incorrect.