GENERAL DESCRIPTION The EICO Model 330 Solid-State RF Signal Generator is a high-quality instrument intended for general service of AM and FM radios, television receivers, and communication equipment. Covering the frequency spectrum (between 100 kHz and 54 MHz in five fundamental bands, it serves as an excellent source of modulated or unmodulated RF as well as audio. FEATURES 1. The RF oscillator consists of a bootstrap circuit that is characterized by low RF distortion. The oscillator output is buffered by an emitter-follower stage to minimize loading effects. 2. A vernier control permits any frequency to be set easily and accurately on any of the five tuning bands. 3.. A self-contained, low-distortion, 400-Hz audio oscillator is included in the instrument. It may be used in conjunction with a calibrated front panel modulation control to internally modulate any frequency on the dial from 0 to 100%. The 400-Hz audio signal is also made available at front panel jack-top binding posts. 4. Input terminals are provided for modulating the RF output with an external signal. 5. Both coarse and fine RF attenuators provide smooth and efficient control of the RF output signal. 6. Each of the five tuning bands is equipped with a separate turret-mounted, slug-tüned coil and piston trimmer that are conveniently accessible to facilitate accurate frequency alignment. 7. The copper-plated chassis minimizes interference, and a coaxial output cable provides low-loss signal injection..