[Elecraft] [K2]...Hot glue toroids to PCB???

[Geoffrey Mackenzie-Kennedy]

Mike,

When mounting toroidal coils used at HF which sit upright on a pcb, my 
practice is to glue a small shim or spacer flat onto the main pcb where the 
coil is to be placed, and then glue the toroidal coil onto the spacer. I 
make spacers from scrap pieces of fibreglass pcb, the type that does not 
have any copper or from which the copper has been removed. The end result is 
that the toroid is spaced slightly off the main pcb and any groundplane or 
tracks (heaven forbid) that might be under the toroid.

The glue that I use is a type of homebrewed "coil dope".  I do not know if 
hot glue would work, applying it might overheat the toroidal core.

Mounting toroidal coils that sit flat on a pcb is quite another ball game.

73,
Geoff
GM4ESD


Mike-WE0H wrote on Monday, March 02, 2009, at 7:43 AM


> Building my K2. Does anyone see any issues with using hot glue to glue
> the toroids down to the boards? I've never had issues gluing toroids
> down in my 600 meter projects. Inductance values have never changed from
> no glue to glued down. But with the K2, it just doesn't seem right to
> leave the toroids loose without gluing them to the boards. So what do
> you guys think, glue or no glue?
>
> Many thanks,
> Mike
> WE0H