Network remote control system External speaker Standard hand microphone (as supplied) VC-Tuning unit (for Sub-band) Linear amplifier/power supply Narrow CW filter, 300 Hz. IF: 9.005 MHz, Main band Narrow SSB filter, 1.2 KHz. IF: 9.005 MHz, Main band Narrow CW filter, 300 Hz. IF: 8.9 ...