My $0.02... Soldering radials -- for many years, dating from my first career in broadcasting, I have used silver-bearing plumbing solder commonly available in hardware stores and home centers. This is typically tin (Sn) with 0.25% or 0.5% silver (Ag). I tried the cheaper 100% tin, but the silver dramatically improves the solder flow and bond to the copper. Clean copper and the right flux is essential. Scotchbrite or similar pads are good; sandpaper may be needed to cut through deeper oxidation. The liquid acid flux works best, but is messy and corrosive -- wear gloves and wash things off when done. Paste flux works fine if the copper is clean, and is a lot easier to work with.
I can't say enough about cleaning the copper -- everything is easier that way. A good physical connection helps too, since it will require less solder and flux. Finally, if you're concerned about protecting a soldered joint, a coating of black silicone or "liquid electrical tape" works well. 73, Gary K9AY _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
