4 Band Double Tuned Preselector

Posted on Feb 6, 2014

The circuit requires an RF input which can be from a longwire or a loop antenna. The Preamplifier has a range from 550kHz (Medium Wave) up to 30 MHz in the SW band. The input Switch S1, applies voltage to a set of relays which switch in the appropriate coils. The preamplifier is double tuned on the input having two IFT coils for each RF range, inp

4 Band Double Tuned Preselector
Click here to download the full size of the above Circuit.

ut applied to G1 of a double gate MOSFET. Gain control is applied to G2 and the output is taken from the DGMOSFET drain terminal. Click here for a picture of David`s MW loop. Click here to view a finished picture of this project.

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