Provision is made for external frequency - shift keying.
Other features include TVI reduction, cw muting for a 75A receiver, a cw sidetone oscillator, a blower, door interlock switches, fuses and an overload relay. Exciter tuning is ganged to one control. With the exception of the power amplifier output circuit, the entire rf section is tuned by the frequency selector control. The accurately calibrated exciter tuning dial indicates the exact frequency in kilocycles for each of seven amateur bands. Only the scale for the band in use is visible.