[Elecraft] [Bulk] [K2] Loose screws on KPA100 Q1 and Q2

[Bill Coleman]

On Mar 1, 2011, at 5:29 PM, K1FFX wrote:

> A reminder to new KPA100 builders ... the very last step in the KPA100
> construction manual is on page 55 and reminds the builder to go back and
> tighten the screws that hold down Q1 and Q2 after 5 hours of normal use.
> 
> I just opened up my K2/100, following the ARRL DX contest, and sure enough
> ... all 4 screws were loose and required the suggested 1/8 turn.

Every time I have the K2 open, and the KPA100 shield off, I check this. I've only found them loose the first time, and I've had the KPA100 board off the heat sink a couple of times.

> And, as long as I have the top off, I'm seeing if can route the ribbon cable
> more optimally, and will tweak the filter alignment.

Ribbon cable position makes a difference, I found. However, once set, the filters seem to stay put. Here's my tips on setting up and aligning the filters:
http://boringhamradiopart.blogspot.com/2010/02/configuring-elecraft-k2-crystal-filters.html




Bill Coleman, AA4LR, PP-ASEL        Mail: aa4lr at arrl.net
Web: http://boringhamradiopart.blogspot.com
Quote: "Not within a thousand years will man ever fly!"
            -- Wilbur Wright, 1901