Richard, When you key the amp using the cable from key out (K3) to key in (KPA-500), do you see the little asterisk next to the frequency on the KPA display? That's the symbol that shows the I/O module key-in line is getting pulled to ground by that cable. If you're not getting that symbol, I would suggest that you have a problem with the I/O module or that cable. If you are getting that symbol, but seeing no RF out on the LED display, it sounds like it's a problem in the PA module (which would be consistent with a sequential drop in power). I'm assuming you've gotten no fault indications and the voltage is within specified limits.
Rob K6RB > Elecraft Group..... > > Just working CW on 15 Meters with my K3 and KPA500 when I noticed the > Power Output LED Indicators starting to drop and continuing until all > were out and the PA dropped out of the Keyed Mode. With KPA500 is > attached with the AUX Cable to the K3 the Symptoms are: (Note: Unit > has been in operation w/o any issues for 3 to 4 weeks) > > 1. Unit is powered up > 2. In the "OPER" Mode, No Keying Up or any indications of any power output > 3. In the "STBY" Mode, LED's indicate both 100 Watts and a <1.5 SWR > Reading > > Again in the "OPER" Mode there is no indication of either a Relay > Keying Up or Power Output. Obviously these are related. Relay not > keying up prevents any Drive to get to the KPA nor any Power Output to > be generated. > > I added back the TX Keyed Line from the K3 to the KPA and still on Po. > I have also taken the unit apart (I built the unit) and checked the > obvious items. I.E. Wires Pinched or Shorted. Connection Loose. > Proper Wire Dressing, "wiggled" any and all boards in case of any > intra-board contact issues......etc. Nothing seems to be out of line > nor is there any "smell" or "odor" of any tell tail component > failures. Unit has been put back together and retested with the same > symptoms. > > I will be calling Elecraft later this AM but in the meantime I thought > I would send a note and look for a possible solution from the > "Elecraft Brain Pool". > > Thanks, > Richard "Dick" Griest - WB4VMH > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
