DD vs. Concentric in the heat?

[marcomo]

I remember reading in the past that a DD/Widescan coil cannot handle being in high temperatures as well as a concentric.

Assuming this is true, can Bryce or any of the other knowledgeable people here elaborate on why?

 

[Critterhunter]

I would assume a DD would handle high tempertures better, but probably not for the reasons you're asking. Concentric coil winding placement is VERY picky. It doesn't take much to put a coil out of alignment, and even slight temperture changes can cause a coil that isn't well built to become unstable. I had one 12" white aftermarket coil for my QXT Pro that would work fine until it warmed up after about ten minutes in the sun. For the longest time I couldn't figure out what was causing this until I read more on building my own coils. Now I know why they made that coil white. After trying two brand new ones they both experienced the same problem.

Anyway, from what I've researched in coil building DD designs are less picky at alignment than concentrics. That's one of the reasons they are more popular among home coil builders, along with being easier to tune.