K2 - Low Power - T1 put in wrong

[konigsburg]

I was helping my friend debug his K2 #3920. It is the qrp version and
will put out up to 4W no matter how the power knob is turned. So if you
want less than 4W, the power was as specified. When we turned the knob
to increase the power grater than 4W, the power would stay at 4W. The K2
also indicated that only 4W were going out. The output power was
measured with a W1 and attached to a dummy load (measured 50 ohm).

We started trouble shooting as in the manual and we found that T1 had
two problems. The first is that there was one extra secondary winding
(green wire). The second problem was that the green wire was installed
into #1 and #2 and the red wires were put into #3 and #4. We are
obviously going to fix both of these problems.

We did check T2, T3, and T4 and they seem to be correct.

We are not engineers, so our question is, could T1 explain these
symptoms, or should we keep looking for other things?

Thanks

:) PK (Paul - K3MZ  K2 #3135  K3 #xxx)
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[Don Wilhelm-3]

PK,

Yes, T1 could explain the problems that you encountered.  Correct T1 and
then see how it behaves.  Yes, there could be another problem, but that
remains to be seen after T1 is corrected.

73,
Don W3FPR

Paul K wrote:

> I was helping my friend debug his K2 #3920. It is the qrp version and
> will put out up to 4W no matter how the power knob is turned. So if you
> want less than 4W, the power was as specified. When we turned the knob
> to increase the power grater than 4W, the power would stay at 4W. The K2
> also indicated that only 4W were going out. The output power was
> measured with a W1 and attached to a dummy load (measured 50 ohm).
>
> We started trouble shooting as in the manual and we found that T1 had
> two problems. The first is that there was one extra secondary winding
> (green wire). The second problem was that the green wire was installed
> into #1 and #2 and the red wires were put into #3 and #4. We are
> obviously going to fix both of these problems.
>
> We did check T2, T3, and T4 and they seem to be correct.
>
> We are not engineers, so our question is, could T1 explain these
> symptoms, or should we keep looking for other things?
>
> Thanks

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