++++++++++++++++++++ To: xppq at pyramid.net, elecraft at mailman.qth.net Date: Wed, 14 Aug 2002 07:17:08 -0700 Subject: Re: [Elecraft] Strange behavior K2/ 100 From: k6se at juno.com xppq at pyramid.net wrote: "I am operating CW, when every once in awhile I hear a brief change in tone , with a long DAH and the "LOW BATTERY" alarm appears on the LED. There is NO battery , just a 13.5 vdc power supply !" ========== You probably have the voltmeter probe switch (S1) on the control board in the "EXT" postion. Switch it to "INT" and it should cure your problem. 73, de Earl, K6SE +++++++++++++++++++ From: "Don Brown" To: "Steve Knell" , "Elecraft" Subject: Re: [Elecraft] K2 #2751 - IT LIVES!!! Date: Wed, 14 Aug 2002 09:21:44 -0500 Hi This is usually caused by the voltmeter switch on the control board in th= e wrong position. I don't think anyone uses the built in voltmeter so I p= ut a dab of silicone rubber on the switch so it can not get switched to t= he external voltage position. A small piece of tape would work also. Don Brown KD5NDB ----- Original Message ----- From: Steve Knell Sent: Wednesday, August 14, 2002 9:05 AM To: elecraft at mailman.qth.net Subject: [Elecraft] K2 #2751 - IT LIVES!!! Thanks to Elecraft for this very neat electrical and mechanical design. My K2 went together and worked first time without a hitch. I just had my first K2 QSO with Max, PA1MAX on 40M and he said it sounded great... I do get the "LO Batt" warning though - using a 20A Yaesu power supply! Anyone had a similar problem or have any ideas where to start looking? Thanks, Steve AB6ZA/G0CKP K2 #2751 +++++++++++++++++++ To: xppq at pyramid.net, elecraft at mailman.qth.net Date: Wed, 14 Aug 2002 14:10:34 -0700 Subject: Re: [Elecraft] Strange behavior K2/ 100 From: k6se at juno.com Josh, N7XM wrote: "checked the S1 switch on control board it is OK - might be RF getting in?" ========== Yes, RF getting into the voltage and current sensing circuits on the control board is a known problem, particularly on 160 and 80 meters. There is a recommended mod to either replace or parallel C42 (0.01 mFd) on the control board with a 0.1 mFd capacitor to alleviate this problem. However, I believe you said you are using the KPA100, and this mod is included with the KPA100 kit, so perhaps (if it is indeed RF getting into this circuitry) your K2 needs even more capacity there. 73, de Earl, K6SE +++++++++++++++++++