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.
_______________________________________________
Elecraft mailing list
Post to:
[hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft
Help:
http://mailman.qth.net/subscribers.htmElecraft web page:
http://www.elecraft.com
Locked
