Total posts : 45366
Thanks much for your willingness to share your adventures and for the great writeups with pics. Some of the best technical advances happen when investigators share the step by step investigations during development rather than waiting until everything is perfect and polished. For example, anyone wanting to follow your lead knows the small wire is not optimum and can save $$$ and time. You also are getting feedback which we all hope is useful.
Regarding Litz wire, you probably know that the DC resistance doesn’t tell much other than the AC resistance has to be greater than this number, thus the smaller the better. Litz wire is intended to lower the AC resistance. A source I used in the 50’s and 60’s (yes I know I sound younger when I type) was old radios and TVs. Console radios built in the 30’s used regular enameled wire in the coils but in the 50’s most table top radios used Litz wire both for IF coils and for antennae. The antennae were commonly spider web wound (as you are doing) on the Masonite back cover plate. Transistor portables from the 60’s and later which used ferrite rod antennas also had Litz wire wound on the rods. These are probably easier to obtain as junkers. Maybe for a few bucks at an antique mall one could find such a treasure, but if it works or is repairable and is old enough it would be a crime against antiques to tear it apart for the Litz. The IF coils in these radios are usually dipped in beeswax and it is easy to retrieve the Litz wire with a little gentle heating. Also if you have never soldered to Litz wire, you are in for a great adventure when you attempt to do so. Just some thoughts and keep us posted.