Uploaded August 2016 | Updated September 2026, 1 week ago

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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.

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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.

Detailed Description, Datasheets, Schematics etc:
ANTENNA-TUNER1:
ak-modul-bus.de/stat/magnetantennen_abstimmgeraet_1_antennatu.html
ANTENNA-TUNER2:
ak-modul-bus.de/stat/magnetantennen_abstimmgeraet_2_antennatu.html

Shop: ak-modul-bus.de/stat/radio_hf_div.html

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Shop: ak-modul-bus.de

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