In April 1928, Pilot Electric Manufacturing and WRNY announced that television broadcast would begin that fall. Pilot would provide the transmitting equipment. Pilot also sold the receivers but Experimenter Publishing magazines provided complete plans that allowed readers to build their own television. The system used by WRNY had 48 scan lines with 7.5 frames per second. The image was about 1.5 inches square. This low resolution picture (without sound) could be transmitted in the 5 kHz audio bandwidth of an AM radio station. (The NTSC 525 line standard definition television signal is allotted a 6 MHz bandwidth.) The first test broadcast was on August 12, 1928. Others had been transmitting television before this but WRNY was the first to have a regular scheduled program. Hugo Gernsback estimated that there were around 2000 television receivers in the New York area.