DIAMOND-WEAVE LITZ COIL by W0HII FOR CRYSTAL RADIO SETS

BUILD YOUR CRYSTAL RADIO!

****Two free 1N34A diodes included****

This is a Diamond-weave hand-wound coil for crystal radios using 250/46 Litz wire. The design is sometimes mistaken as a spider-web coil but since it has no inner former spokes, it is called a diamond-weave. Please Google for crystal radio schematics. See photos. The Wooden stand shown is for demonstration purposes only and is not included.  Two free 1N34A diodes are included. 

 To tune the broadcast band a 365pf variable capacitor is needed, not included.

There are no loss causing formers, coil is self-supporting, air-wound, held together with q-dope glue and sprayed with crystal clear acrylic to strengthen the coil.  Lead length is approximately 6”, and pre-tinned. This coil wound using a 15-pin former, a 36% increase over the 11-pin former, meaning more crossovers for better inductance performance, less inner capacitance.

A 2.5-inch nylon screw and 3 nylon nuts are provided to mount the coil on your set. Each coil measured for proper inductance using an AADE L/C Meter IIB precision meter. See photos.

Coil Dimensions:

Coil ID:          1.650-inches

Coil OD:        3.675-inches

Coil width:    0.375-inches

Inductance:  245.7uH

This coil is new and is sold as-is. Coil will be well packed in its own plastic container (see photo) and shipped within the US via USPS Priority Mail. Note: Postage cost has now approached $10.00, thus the price increase. Please contact if you need additional coils. See my feedback. 73, John W0HII