I would like to put my K2/100 back to a basic K2 as part of debugging some problems I've had around power and RFI distortion. I have the K2, KPA100, KSB2, and KNB2 installed. My plan is to only remove the KPA100 at first to see if that corrects the problems I've been having.
As I understand it, removal of the KPA100 involves only the following: 1. Disconnect the ribbon cable that goes between the KPA100 and P4 on the control board 2. Disconnect the Aux 12v connector that goes between the KPA100 and the Aux 12v jack on the main board 3. Disconnect the Aux RF connector that goes between the KPA100 and the Aux 12v jack on the main board 4. Disconnect the SPKR connector that goes between the KPA100 and the SPKR jack on the main board 5. Install the SPKR connector from the original top cover to the SPKR jack on the main board and screw on the original top cover (in an uncharacteristic fit of planning, I did keep the original top cover). 6. Uncover the BNC RF out jack on the K2 base and use that in place of the SO-239 on the KPA100. My original top cover did have the KIO2 installed for interface to the KAT100, and it is my understanding that I can simply plug that into P4 on the control board. Is there anything else I need to do? For reference, my problems at the moment are as follows: 1. I get RFI distortion on digital and SSB on the lower frequencies (40 and 80 meters). I get the distortion when feeding the K2 directly into a dummy load and I get it when feeding the K2 into a Buddipole about 100' from my shack. I do not get the distortion when running an FT-897 in similar circumstances. 2. The output power is not consistent. On tune, my MFJ 941E and Elecraft W1 usually read about twice what the K2 says it is outputting (about 20w). On CW, the readings per the MFJ and W1 disagree with what is dialed into the K2 although the amount and direction of the difference varies by band. 2. Going straight into a 50 ohm dummy load, (no MFJ, no W1), the K2 is reading SWRs of 5: or 6:1 in tune mode. When I put the MFJ and the W1 in the line, they both read 1:1 even though the K2 continues to read 5: or 6:1. I believe that the MFJ and W1 are reasonably accurate based on testing against other devices. Thanks, Jon KB1QBZ ______________________________________________________________ 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
