Dear Don
My K2/100 is working again
I replaced D16 and D17, resoldered all components of the wattmeter
circuits, and all problems with swr and power readings were solved.
Many, many thanks for your help.
I was not so happy with the ATU/100.
When you try to tune, relays switch, swr leds do not light, LCD
shows swr 1:1, although it should show more than 2:1, switching stops
after 2-3 seconds, and if you tune again the process repeats.
K2/100 and KAT7100 communicate: high or low power indication leds light
according to the power required, Ant 1 and Ant2 switch correctly, all
switches
Maybe there is a problem with U8?
Your kind assistance will be welcome once again.
73
Raimon
EA3EZO
Raimon,
If it were on my workbench, the first thing I would do at this point
is to replace KPA100 D16 and D17, then check the operation of the
wattmeter again.
If I understand correctly, it did work at one time, so no additional
calibration of the wattmeter should be required. If the new diodes do
not correct the bad readings, then you should look for an unsoldered
or poorly soldered connection in the wattmeter circuits - R26, R27,
U5, U6, Q10 and Q11 as well as the associated resistors and
capacitors. Check the schematic to see which components are connected
to the listed devices. Check the lead tinning and soldering of T4 at
the same time.
After the KPA100 is working correctly, add the KAT100 and check the
combination. If you have to obtain 1N5711 diodes to replace the ones
in the KPA100, order 2 for the KAT100 at the same time so you will
have them available in case they are needed.
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