Holger,
Those resistance values indicate that D16 and D17 in the KPA100 are
faulty. The resistance in the forward direction should normally be much
lower. You can check to see if your ohmmeter is reading properly by
measuring a new or known good small signal diode.
I believe if you check the power output with an external wattmeter and
connected to a dummy load, you will find a higher than normal power even
though the K2 display and LED Bargraph indicate no power.
You might want to check D1 and D2 in the KAT100 as well.
73,
Don W3FPR
On 5/5/2014 3:09 PM, dl9...@dl9hda.de wrote:
Hi,
my K2 works well but I have issues with my KPA100. KPA100 and KAT100
are both situated in an external enclosure but the KAT100 is
permanently disabled (cal-mode). I used the KPA100 to drive my
tube-amplifier ...
I cannot exactly say what happend but for a year or so the maximum
output power on all bands has been only 60W. It's enough for the
tube-pa but now the output is zero.
If I change the band or hit the antenna-switch the relays are working.
So the communication seems to be OK.
While pressing tune the K2 says high current and there is absolutely
no output-power an the K2 and of course at the KPA100. (The K2 without
any connections to the second enclosure works pretty well!!!).
So the first guess was to check the diodes D16 and D17. I did not
desolder them but I made some measurements with mit Fluke 177.
D16: Diode-Voltage zero and the other direction shows 0.390 V. The
resistor-values are 95.7 KOhms and 104,6 KOhms
D17: Diode-Voltage zero and the other direction shows 0.387 V. The
resistor-values are 95.5 KOhms and 105,2 KOhms
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com
