[Elecraft] Compounds to retain windings in place on toroid cores

[Jack Smith]

Mike:

If it isn't needed--which is is not in the K2--don't use it. My 
measurements do not, for example, show the long term effect of retaining 
compounds. Nor do they show what happens when the temperature is 
increased and some compounds soften. I'm reasonably confident Q-Dope is 
stable from working with it over some considerable time, but I don't 
have the same confidence factor for the other compounds.

All of the K2 toroids are wound to X number of turns, not to a specific 
inductance value. Any shift in the windings from being un-retained are 
highly unlikely to change the inductance more than the typical 
core-to-core variation. (Ferrites are commonly quoted as +/- 20% 
core-to-core variance and powdered iron is more like +/- 10%. Windings 
shift after measurement might account for 1 or 2% change.)

Jack K8ZOA


Mike-WE0H wrote:
> Why not use hot glue on the toroids in the K2? That link shows hot glue 
> as a very good wire retaining compound. Does anyone have any data that 
> suggests a K2 would not function to the manufacturer's spec's if hot 
> glue was used on all the toroids?
>
>