2006 Crystal Radio Convention
Springfield, MO USA
I (Josh Young) am on the left followed by Mark Rotsch(Battradio) and Mark Hampton (ErrDucks) is on the right. The table is just full of wonderful things-Ceramic Silver plated caps, Litz wire-SP elements, Miscellaneous coils, tools. Truly a radio builders delight! Underneath the table was more of the same wonderful stuff.
This time it is Josh, Kevin and Mark Hampton.
Mark Hampton(Err Ducks) is heading to his truck to pull out some goodies, and Mark Rotsch(Battradio) and I are discussing something or other in depth. Josh's loop is in the foreground.
This is Mark Hampton(Err Ducks) listening to a crystal set through an ultimate matchbox(made by Mark Rotsch) with RCA SP Phones.
Kevin Norton(Krystallo) is playing with a quickly thrown together double tuned Pot Core set that we all go the opportunity to build together. More in picture #8 description.
This is a crystal radio that Kevin(Krystallo) put together and gave to me for allowing the event to be held at my house. It is a nice single tuned Oatbox type radio that sports a home made Catwhisker & mounted crystal.
He also did a real nice job in making a styrene panel on the inside with knurled brass nuts that allows multiple circuits to be explored with the same set. It was very thoughtful of him to do this!
Well, here we have Mark Rotsch’s(Battradio’s) double tuned ferrite DX Set. It has single knob tuning from the two tracking L/C Circuits. This is Marks main DX set, although he is working on others. Coupling can be adjusted by lowering one of the ferrite rods on the ceramic standoff assemblies. It is sitting next to Marks Matchhbox that sports two LS-12’s, O-15, and other Misc. high quality transformers.
This is a X-tal set created by Mark Rotsch again. The set with the Plexiglas front is a simple by pass set made with 660/46 on ft 240-61 toroid's.
Once again this is the little set we all made together. Mark Rotsch(BattRadio) Supplied the parts, and we all pitched in and put it together. Not too bad for a couple hours of work! The coils are 165/46 Litz wound on Pot Cores, and coupling can be adjusted by separating the two coils on the styrene rod. I believe we used HP 5082-2835’s for the detector. It functioned very well, and seemed to be pretty sensitive. We were using the best caps, Litz, RCA SP Phones, and LS-12’s though.
The Ferris wheel loop is 6 feet in diameter (1,83m) ,6 inches (15 mm)wide , counter wound coils of 440/40 littz resulting in 85mh in parallel and 335 mh in series . Left it at Josh's house for him to use. He is comparing it to his 8 foot (2,44 m) loop wound with 18 gage and says that the 6 foot loop with litz is about 25% better than the 8 foot loop. Both loop use almost the same length of wire the 8 foot has 2 coils of 3 turns and the 6 foot loop has 2 coils of 4 turns.
Thanks for the nice descriptions, Josh and Mark R. and thanks to Kevin and Mark R. for the great pictures. It looks like you all had a great time. - Dave