Topband: soldering radials

[K9AY]

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