[K2] frequency drifting

[oe9fwv]

this morning I was trying a new antenna for portable use and therefore I
turned my K2 on. When I was first listening I thought I had not connected
the antenna because no sound came out of the radio. I switched it on and
off and suddenly it worked.
Then I listened to a station on 80m and suddenly it was slowly drifting
away - I could follow it with the VFO for some seconds, then it
disappeared completely (the radio went silent) and with a small plop it
was there again on its original frequency. The frequency display did not
move when this happened unless I turned the VFO. This repeated several
times, I switched the radio on and off, no joy, but after a short time, I
guess about half a minute or so the problem had disappeared.
I could make QSO and everything looks ok.
What could this be?

73! de Werner OE9FWV

--
es gibt Leute sind dümmer als ein Büchse Whiskas. Denn
im Whiskas hat es immerhin ein bisschen Hirn.....


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[Don Wilhelm-4]

Werner,

My best guess - a bad solder connection that responds to thermal changes.
It could be either in the VFO or the BFO.  The first thing to determine
is which of the two is causing the drift, then track it down to the
component that is causing the problem.
Because it does not fail after a short warmup period, it real source may
be difficult to find unless one has access to an environmental chamber.
It may be easier to reflow the solder in both areas and hope it does not
re-appear.

73,
Don W3FPR

Dr. Werner Furlan wrote:

> this morning I was trying a new antenna for portable use and therefore I
> turned my K2 on. When I was first listening I thought I had not connected
> the antenna because no sound came out of the radio. I switched it on and
> off and suddenly it worked.
> Then I listened to a station on 80m and suddenly it was slowly drifting
> away - I could follow it with the VFO for some seconds, then it
> disappeared completely (the radio went silent) and with a small plop it
> was there again on its original frequency. The frequency display did not
> move when this happened unless I turned the VFO. This repeated several
> times, I switched the radio on and off, no joy, but after a short time, I
> guess about half a minute or so the problem had disappeared.
> I could make QSO and everything looks ok.
> What could this be?
>
> 73! de Werner OE9FWV
>  

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