Bob,
It is normal for the K2 to develop full power if the VRFDET signal is
not being sent to the K2 microprocessor. The 20 watts is not the
problem, but the result.
For some reason, the VRFDET signal is not getting from the KAT100 back
to the K2. First check the cable between the KIO2 (or KPA100) and the
KAT100 to be certain it is connected like the illustration in the KAT100
manual.
If your wattmeter calibration for the KAT100 was successful, you had
good level signals at the inputs to U5, and I conclude there is no
problem with T1 or the diodes in the wattmeter.
Check U5 with RF power applied to the KAT100 - you should have the same
voltage at U5 pin 1 as the voltage at U5 pin 3. If that is true, check
the voltage at U6 pin 3 and the VRFDET signal at U6 pin 6 (should be
about half the voltage of pin 3). Be certain you have an active enable
signal (near +5v) to U6 pin 8.
If you do have a VRFDET signal at KAT100 U6 pin 6, but none at the K2,
then there is something wrong with the wiring of the VRFDET signal path.
73,
Don W3FPR
F5UL wrote:
> In the lasr email ,I forgot to say that evec with more than 20w output
> on the
> power meter, the indicated power on the display was only 0.4 w!!!
>
> Rectification : about VREFDET it is 0.8 v , not 1.3v!
>
> VALC (Q8 emeteur) power set to 0 v=0.8, powet set to max v=2.6 v
>
> Puting back the KAT2 I have the same reaction power out ~20w with
> VREFDET 3.8 v whatever
> power asked for.
>
> With the KAT2 the display is giving the real power as I have on the
> external wattmeter (more or less 20/22w)
>
> Regards F5UL/Bob
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