Two USRP N210s for each transponder. Both are sync'd to the house reference and used timed streaming so the recordings are synchronised. The 'Zoom' tabs focus in on the transponder signal.
VIdeo: Recording both ISEE-3 transponders at Arecibo after first contact
Tweets by @SpaceRef | Tweets by @nasahackspace | Tweets by @LunarOrbiter |