[Elecraft] KX1 - Power Amplifier Q6 Installation Question

[Don Wilhelm]

  Barry,

Yes, this is sometimes a problem - in all cases, the lockwasher between 
the spacer and the board must be present to make the standoff the 
correct height.  I have omitted the second lockwasher in some cases, and 
in others, I have used already compressed lockwashers that have been 
laying on my workbench.  Your technique of squashing the lockwashers 
with vise-grips was a good one  I am glad you were ultimately successful.

73,
Don W3FPR

On 4/7/2011 7:52 AM, K8QI wrote:
> I am currently building Serial # 2520.    Going well with no problems found
> during the testing of Phase #1 or #2.   Thanks to all for the great
> suggestions to a new kit builder.
>
> Figure 24 shows the installation of the standoff using 2 split washers, One
> below and one on top of the board.   I am not able to get the threads to
> catch using the 2 washers.    So I only used the one on the top of the board
> to maintain the correct heigth of the standoff.   I am a little concerned
> that the threads from the 3/16 Pan head and the Nylon 1/4 Flat Head may
> contact inside the standoff and result in the Power Amplifier Q6 being loose
> and not making good contact with the Thermal Pad.  Did anyone else have this
> problem?   What was your solution?
>
> During the solder process for the Power Transistor Q6, the instructions
> state to "Temporarily secure Q6 with a 4-40 flat head screw....."     My
> question is should I use the nylon flat head or the metal flat head for this
> solder step.   Any possibility of deforming the nylon flat head during the
> soldering process due to heat transfer?   My thought is no, use the nylon.
> Thought I would ask, since I already have the question above.
>
> If all goes well, I hope to have my new KX1 on the air on 20 and 40 meters
> this weekend.
>
> Thanks and 73,
>
> Barry K8QI
>