Display MoreThis is not what AMSAT recommends and how the Link budget for QO-100/Es'hail-2 was designed
A 60cm should be the minimum for receive...
A 40cm dish might be sufficient for portable operation, but only if all components of your receive system are fully optimized and you are in the center/middle regions of the QO-100 footprint..
Anyhow, we should always improve hearing performance and not become a crocodile...
Of course I know the Amsat recommendations. The purpose of my comment was to encourage new users not to be frightened by thinking large antennas are needed. Certainly not for the transponder NB.