[amsat-bb] Is ISS Digipeater not always on for use?

The reason I ask is because the other day when ISS was xmit SSTV, I was able to digipeat through the 145.800 ax.25. As this was my first ever try at such a mode, I wasn't real sure what the heck I was doing.

The last couple days I have tried to digipeat through but don't even hear anything on 145.800/145/990 .

73,