Mark VK5QI, and I have recently documented the set up and use of a receiver for LilacSat-1.
This cubesat has a 2m FM uplink and a 70cm digital down-link that uses a custom modem and Codec 2.
Our documentation is targeted at anyone with a laptop running Ubuntu 16.04 (though other versions may work too), a RTLSDR, LNA, UHF antenna, an Internet connection, and a few hours of time. We have written several scripts that help install and build all of the software you need – in particular GNU Radio.
You can find everything you need here. LilacSat-1 will re-enter in August, so time is of the essence!
73, David VK5DGR