G.E. YRS-1

Single Sideband is a form of Amplitude Modulation. An ordinary AM signal consists of a carrier frequency and two sideband signals, occurring immediately above and below the carrier frequency. A single sideband signal results from removing the carrier frequency and one of the two sidebands, thus drastically reducing interference.

Although single sideband transmission and reception systems had been used for years by commercial stations, the complex equipment required discouraged use by consumers and amateurs. The 1948 GE YRS-1 was the first simplified method of selective single sideband reception requiring no critical filter networks, crystals, or specialized components.

The first button (Single Sideband 1) allows reception of one sideband signal. It will be either the upper or lower sideband - depending on which side of the received frequency the oscillator operates. The second button (Single Sideband 2) allows reception of the other side band. The third button (Locked Oscillator) provides a strong, non-fading artificial carrier, reducing the distortion on fading signals. The forth button (Normal Reception) allows for just that.

Information taken from: GE Ham News Volume 3, Issue 6 from 1948 and from the Encyclopedia Of Electronics edited by Stan Gibilisco, 1985. A TAB Professional Reference Book.