Heathkit SB-310 Receiver Bands: 3.5, 5.7, 7.0, 9.5, 11.5, 14.0, 15.0, 17.5, and 26.9 MHz. Three amateur radio bands: 80, 40, and 20 meters. 26.9 MHz CB band Dual Conversion Receiver circuitry ( IF at 8.395 MHz and 3.395 MHz) Three IF Crystal Filters........5 kHz AM, 2.1 kHz LSB and USB 400 Hz CW) Controls: Fast, Slow, and AGC off Function Knob: Power Off, Stby, OPR, Cal. Mode Control: LSB, USB, CW, and AM AF Gain: volume control, pull out the knob for AGC OFF Preselector Control RF Gain Control Main Tuning Control - covers 500 kHz of each band Rear connections: Antenna Mute 500 ohm out Speaker Output - 8 ohm Hi-Fi output Spare jack