Description
Class H03J : TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
Subclass 3/14: Continuous tuning (H03J 7/00, H03J 9/00 take precedence; combination of continuous and discontinuous tuning other than for bandspreading H03J 5/00) Details Electrically-operated arrangements for indicating correct tuning Visual indication, e.g. magic eye