Digital Readout Model 244

Plugs into the accessory socket of the Model 540. Six digits show actual transmitted and received frequencies to hundreds of Hertz. The VFO output frequency, which is 9 MHz away from the operating frequency, is counted and a 9 MHz preset is either added to or subtracted from the count by means of the front panel mode switch, thus eliminating all VFO crystal tolerance errors. The 9 MHz oscillator tolerance error is eliminated by setting the time base gating oscillator to WWV. A COUNT position on the mode switch permits using the 244 as a straight 50 kHz to 22 MHz frequency counter. Includes cable. Housed in matching enclosure.