Loop Antenna Crystal Radio

A loop antenna crystal radio is of interest on account of its selectivity and portability. But, with respect to signal strength, it is no match for a crystal radio using an external vertical wire antenna and earth.

If signal strength could be considerably improved with increased loop size, then its portability would be compromised.

It may be configured as parallel-tuned or series-tuned.

1. Parallel-tuned version 

Parallel-tuned Loop Antenna Crystal Radio

2. Series-tuned version

Series-tuned Loop Antenna Crystal Radio

The loop antenna was rigged up using a 4-legged stool as a makeshift frame. The stool was laid on its side on the table, making it convenient to wind the loop on its legs.

4-legged stool as Loop Antenna frame

Both the versions were tested with the loop oriented end-on towards the local 612 kHz, 200 kW AM broadcast station.

Signal strength was the same with both, though a far cry from another crystal radio using a vertical wire antenna and earth.

Related post: Another Loop Antenna Crystal Radio
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