The Signal/One Model CX7 is a self-contained, deluxe integrated station, designed for the professional-amateur radio operator. The construction technique utilizes solid-state circuitry throughout, with the exception of the Nixie tubes and the transmitter power amplifier stage which is a ceramic-metal tube. The Model CX7 is capable of operation in the SSB, CW, FSK and compatible AM mode. Frequency coverage includes all the amateur bands between 1.8 and 29.7 MHz with provisions for accepting spare crystals permitting operation in the non-amateur frequencies from 2 to 3, 4 to 7, or 8 to 14 MHz. Two separate VFQO's provide the capability of simultaneously receiving two separate frequencies within the same band and transmitting on either. Tuning to the precise frequency is accomplished by observing the arabic numerals being indicated by the Nixie tubes while adjusting the VFO control for the desired display.