It's been said the previous system model was unrealistic.     The ARC-5 "FAR" NDB Frequency range and frequency is set on the main control box i.e.   Senaki-Kolkhi Outer NDB = 335 kHz Frequency Range = 310-640 Dial/Kneeboard = 334 kHz   The ARC-5 "NEAR" NDB Frequency range is set on the NDB 1/2/3 Switches and frequency is set on the main control box (it should need little if any adjustment) i.e.   Senaki-Kolkhi Inner NDB = 688 kHz NDB frequency range switch "NDB 3" = 640-1300 Dial/Kn