Extended Data Figure 1: Block diagram of the low-band system.
From: An absorption profile centred at 78 megahertz in the sky-averaged spectrum
The inset images show: a, the capacitive tuning bar that feeds the dipoles at the top of the balun; b, the SubMiniature version A connector at the bottom of the balun coaxial transmission line where the receiver connects; c, the low-1 receiver that is installed under its antenna with the ground-plane cover plate removed; and d, the inside of the low-1 receiver. The LNA is contained in the secondary metal enclosure in the lower-left corner of the receiver. SW, switch.
