[Elecraft] KPA 100 L16 and RFC1

[Jim Wiley]

Ray -

Is it possible that the toroids are wound the "wrong" direction? Check 
the assembly illustrations carefully.  It makes a difference whether the 
winding starts in a "clockwise" or "counter-clockwise" manner as to 
whether or not the leads line up with the solder holes in the PC board.  
Use of adhesives to secure coils is usually not recommended - although I 
cannot see how it could hurt, performance wise. Securing the toroids to 
the board could make future servicing difficult.  There have been few or 
no reports of toroids coming loose or having wires break, even in mobile 
service.

- Jim, KL7CC


On 12/9/2012 1:31 PM, Ray Collins wrote:
> I am constructing the KPA 100 and have just fitted L16 and RFC1 (both blue cores wound with 37 turns of 26 gauge wire).  I am having difficulty getting the two toroids to sit securely on the PCB because the leads do not align with the holes in the PCB so preventing the toroids from being pulled tight against the board.  The toroids seem quite wobbly and I am concerned that with shock and vibration, the wires will break.  Any suggestions?  How about a very small amount of epoxy adhesive between toroids and PCB taking care to avoid the windings?
>
> Many thanks,
>
> Ray
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