[Elecraft] Use of Coolant Spray OK?

[Don Wilhelm]

Todd,

That means that you have not found the offending bad solder connection.
Keep trying, and use a soldering temperature of 750 degrees F when reflowing
the joints.  If you see a 'bubble' of flux when you heat the solder
connection, that is a sign that insufficient temperature was applied when
the soldering was initially done.  Often a bit of extra flus and solder will
help, but be prepared to wick away any excess solder too.

Keep trying, you are on the right track.

73,
Don W3FPR

> -----Original Message-----
>
> I have K2/100 #1130 which I use for field day and occasional mobile use. A
> couple of years ago, an instability on receive began which would
> eventually
> disappear after a few minutes of warmup. Signals sounded ‘chirpy’ and
> somewhat raspy. Later, I found that the same problem manifested itself on
> the transmitted signal. I went through the Control and RF boards and
> resoldered many connections in hope that a poorly-soldered joint would be
> the culprit. That seemed to clear the problem up for a few months, but it
> reappeared. I’m just now getting around to troubleshooting the
> problem after
> a hiatus of about a year and hope to have the rig ready for the Wisconsin
> QSO Party as a mobile entrant four weeks from now. I spent the better part
> of today re-resoldering <g> the same places I had done so before, but the
> instability remains.
>
>
>
> The rig stabilizes as it heats, usually after about five minutes, but band
> as well as filter changes can bring the instability back for a
> few moments.
> Eventually, the problem disappears with extended use.
>

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