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Published on Aug 11, 2016
Roger introduces 4 new tuning-boxes designed for tuning a magnetic antenna like a loopstick- (ferrite-rod), a frame-, loop- or spiderweb-antenna or any other (inductive) magnetic antenna. 2 models are for tuning with a variable capacitor of the plastic-film type. The other 2 models use varactor-diodes for tuning. The tuning-boxes are designed for greatest versatility, highest Q-factor and sensitive frequency tuning. The signal from the resulting resonant LC- or tank-circuit is buffered with a JFET so that the Q-factor of the LC-circuit is not diminished (only 10 Mohm load-resistance to the LC-circuit). Input-connection is with high-quality binding-posts that also accept 4mm banana-plugs with 19mm spacing. Output-connection is with 4mm banana jacks or with a BNC-connector.