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Crystal Radios Of The 2004 Contest Entrants

Page 2

Dan Petersen

Crystal Radio Group contest Entry 2004

Here is a picture of Dan's set, the "Litz Blitz". This set is in the XSS Newsletter as an article in the March, 2004 issue.


Brian Wingard

Crystal Radio Group contest Entry 2004

Notice the FT114-61 cores and large diameter wire. Brian uses separate cores for Lo Band/Hi band.

Crystal Radio Group contest Entry 2004

Crystal Radio Group contest Entry 2004

Steve Bringhurst

Crystal Radio Group contest Entry 2004

Steve uses a BC-221 as the basis for his BCB set. The BC-221 is a frequency meter, WWII vintage.

Crystal Radio Group contest Entry 2004

Crystal Radio Group contest Entry 2004

Mike Tuggle

Crystal Radio Group contest Entry 2004

Mike Tuggle's record smashing DX set.


Mike Branson

Crystal Radio Group contest Entry 2004

Crystal Radio Group contest Entry 2004

The matching unit.

Crystal Radio Group contest Entry 2004

Crystal Radio Group contest Entry 2004

Jack Bryant

Crystal Radio Group contest Entry 2004

I started putting the set together on January 5, 2004...way late! I used a black plastic clipboard for the front and a clear orange plastic one for the chassis plate. 1"x3" small boards are used to hold up the chassis plate. I installed the coil supports during the contest and the phone jack afterward.

This set is a modified bandpass unit, but uses two separate coil assemblies. Each assembly consists of toroids wound on FT114-61A cores for the antenna and detector coils. Each assembly has it own coupling coil, connecting the antenna and detector circuits.

Here are the specs:

Lo Band
Antenna: FT114A-61, 33T #18

Couping Coil:FT-82-61, 10T ant side, 5T detector side,    tapped every turn (det side only) Detector: FT114A-61, 40T #18

High Band

Antenna: FT114A-61, 22T #14 Couping Coil:FT-82-61, 10T ant side, 5T detector side,    tapped every turn (det side only) Detector: FT114A-61, 20T #14

The audio transformer is one of the Fair Radio 100k:100 ohm units. The headphones are Dynalec mic elements. I started with one of the ITT diodes, then settled on one with a blue stripe (characteristics unknown).

Crystal Radio Group contest Entry 2004

Continued on Page 3.