KX1 - Power Amplifier Q6 Installation Question

Posted by K8QI on Apr 07, 2011; 11:52am
URL: http://elecraft.85.s1.nabble.com/KX1-Power-Amplifier-Q6-Installation-Question-tp6250034p6249642.html

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