K2 problem with SSB transmit

[Gary D Krause]

I've noticed lately that my K2 will stop transmitting on SSB after a
short period of time.  It has happened before.  If I turn it off and let
it sit a while, it will work fine again.  It seems to me that perhaps it
is some kind of thermal problem.  I haven't had a chance to look at it
yet but, if anyone else has had this problem and knows what to look for,
I would appreciate it.  My K2 is the 10 watt version.  CW works great
with no problems.
Thanks,
Gary N7HTS
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[Don Wilhelm-4]

Gary,

That is the classic symptom of a poor soldered (or unsoldered) connection.
If you can get it to fail (and keep it in a failing state), then you can
troubleshoot it, but if not, take a critical look at all the soldering
on the KSB2 board and reflow anything that looks like a bad solder
connection.

If you see a rounded mound of solder on any connection, that is a
suspect joint.  A mound of solder will mask a bad connection - and the
cause is usually that the solder pad did not receive adequate heat
during the initial soldering process. The soldering tutorial on the
Elecraft Builders Resource page has renderings of good and bad solder
joints should you not be familiar with what to look for.

73,
Don W3FPR

Gary Krause wrote:

> I've noticed lately that my K2 will stop transmitting on SSB after a
> short period of time.  It has happened before.  If I turn it off and
> let it sit a while, it will work fine again.  It seems to me that
> perhaps it is some kind of thermal problem.  I haven't had a chance to
> look at it yet but, if anyone else has had this problem and knows what
> to look for, I would appreciate it.  My K2 is the 10 watt version.  CW
> works great with no problems.
> Thanks,
> Gary N7HTS
>

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[Gary D Krause]

Thanks Don.  I'm glad to hear that it's a classic symptom.  Checking the
soldering was the first thing I was planning to do.
Thanks,
Gary N7HTS

Don Wilhelm wrote:

> Gary,
>
> That is the classic symptom of a poor soldered (or unsoldered)
> connection.
> If you can get it to fail (and keep it in a failing state), then you
> can troubleshoot it, but if not, take a critical look at all the
> soldering on the KSB2 board and reflow anything that looks like a bad
> solder connection.
>
> If you see a rounded mound of solder on any connection, that is a
> suspect joint.  A mound of solder will mask a bad connection - and the
> cause is usually that the solder pad did not receive adequate heat
> during the initial soldering process. The soldering tutorial on the
> Elecraft Builders Resource page has renderings of good and bad solder
> joints should you not be familiar with what to look for.
>
> 73,
> Don W3FPR
>
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