Test render, another bit of vintage kit for my virtual radio shack, still got plenty to build. The Yaesu YO-100 is a station monitor scope that will allow you to monitor and adjust your transmitter for the cleanest signal possible. The YO-100 is compatible with virtually all transmitters and transceivers. The cabinet and front panel design of the YO-100 matches that of the FT-101B/277B and FT-201 series of Yaesu equipment. The features include a wide range of inputs for monitoring many different modes, such as SSB, CW and Digital. A built-in 1500 Hz and 1900 Hz tone generators greatly adds to the versatility of this station accessory. This two-tone generator produces the proper audio signals to perform a "trapezoidal" pattern for testing the linearity of a transmitter or amplifier.