BELOW_BROADCAST_BAND

Published:2009/7/16 3:35:00 Author:Jessie | From:SeekIC

Simple solidstate converter can be used with any good communication receiver covering 3.5-4 MHz to bring in stations from 5-550 kHz (200 meters and up). Input coil L1 is changed from 0.28 H for 5-11 kHz to 120 μH for 250-550 kHz in eight steps, as given in article. C2 consists of two 3-gang variable capacitors with stators wired in parallel, gang-tuned with dial cords. Trimmer C7 is 1-12 pF, adjusted to give reliable starting of FT-2433500-kHz crystal. L2 is 80-90 μH for 80 meters, and loopstick is for broadcast band. -K. Cornell, 200 Meters and Up Receiving Converter for Low Frequencies, Ham Radio, Nov. 1976, p 24-26.



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