Attempted to use this mode on 2 passes but was not successful. Several stations tried to work on the first pass over Australia (07:51 UTC 29 Dec) but audio was very weak and there was a lot of interference on the signal. Some stations had difficulty netting onto frequency, probably because they could not hear themselves clearly. On the second pass I could hear no other stations attempting to access and while the downlink signal was strong there were all manner of noises present and only once or twice could I actually hear my voice among the noises. I'm sure that last time AO-51 was in this mode it worked reasonably well. Will be interested to hear reports from other continents to see if the interference was specific to this region.
73 Alex / VK5ALX