Rebroadcast from July 27, 2013. The Dark Spectrum follows a series of electromagnetic (EM) spectrum mapping, interception and transmission performance structures, which the SPEKTR collective started exploring in 2004. Their new work in this series will focus on processes of encoding/decoding of the EM spectrum and natural/man made signals. SPEKTR will collectively spend time with a standard suite of tools: HF, VHF, UHF and L-band Receivers and Transmitters software defined radios, home-brew VLF receivers, and ELF probes complimented by software toolkits (COTS and custom coded) to decode, encode and visualize digital signals. Combined with image and audio recording devices and manipulation strategies, the collective will work together to develop new ideas and segments for a new performance focusing on the digital and encoded/encrypted signals domains.