Just get a new rubber bumper. Not only does that glue make a mess of
things, but it has potential for changing the inductance.
73,
Don W3FPR
On 4/15/2014 5:35 PM, TheMG . wrote:
I've put a piece of paper under the bumper and re-installed L33 held
tightly down against the board (pushing the resistor down so it holds
it tightly).
No observed drift in frequency after a couple hours other than the
normal temperature-related drift (about 10Hz downward).
This does seem to confirm that the bumper conductivity was in fact the problem.
Looks like I will need a new rubber bumper. I'm not sure what happened
to this one to make it conductive, but it's definitely not something I
did as I did not use any cleaning chemicals when initially building
the K2 (not even alcohol).
I'm also considering just securing L33 in place with a dab of
electronics-grade silicone and leaving it at that. Although Elecraft
does not recommend it I don't see how it would be a problem if the
proper type of silicone is used that is non-corrosive, non-conductive,
designed specifically for electronics use. If it's good enough for use
in aircraft electronics... it ought to be fine for this. Of course, it
would make it slightly more difficult to remove L33 in the future if
for some reason it was ever necessary to remove it, but not
impossible. I'm not too worried about that.
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]
