From Moon-Net 9 mars 2019:
Hi Dave
It very much depends on the size of the station you are working, the Spreading, the Lunar degradation and the use of QRA64-D. If you attempt to work some of the better stations such as HB9Q (10 Meter dish), OK1KIR (4.2 metre dish), G3WDG (3 metre dish) or W5LUA (5 meter dish) it should be easy with a 1 metre dish. It is possible to work them under good conditions with 5 watts and a 77 cm dish using QRA64-D. It is also possible to copy the DL0SHF beacon (7.2 metre dish) on a 10x13 cm horn under good conditions. With a 1 metre dish should be able to copy the beacon with even the worst conditions and have several dB to spare.
73 Rex VK7MO
Work the World with WSJT-X - Dr. Joe Taylor
by Rex Moncur, VK7MO and Charlie Suckling, G3WDG
2. "Getting the best out of QRA64 on 10 and 24GHz" G3WDG, 9 jan 2017 v1.6 PDF