Portable AM Crystal Radio

Here's the schematic of the portable version of my Crystal Radio.

Portable AM Crystal Radio - Schematic
It was wired on a piece of perforated board.

Two 4.7 mH moulded inductors, connected in series at the feed point, resonate the 0.75 m long telescopic antenna at 612 kHz (frequency of the 200 kW AM station located 20 km away).

Portable AM Crystal Radio
At first nothing was heard even on the shack roof. However, on moving around, a favourable spot was found where the reception was indeed quite good.
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