This evening I finished installation of the KRX3 that I ordered back in April, and I ran into a problem with poor sensitivity on the Aux port I thought others might be interested in.
After I completed installation of the KRX3 and went through the requisite VCO calibration, filter setup, etc., I found that the receiver worked flawlessly on the main antenna, but sensitivity on the Aux port was poor (about 30 dB below that of the Main antenna port). Thinking that I might have a bad TMP cable from the KRX3 Aux port to the KAT3, I pulled the KRX3 out, removed the KRX3 circuit board from the shield, and used an ohmmeter to confirm continuity. All was well. I reassembled the KRX3 and reinstalled it, same problem. I then removed the top portion of the shield while the KRX3 remained in situ, and sensitivity on the Aux port was normal. Spark arrestor, SA1, is mounted very close to the edge of the circuit board. In my KRX3, this component has "leaning" towards the outside edge of the board sufficiently to allow the top shield to short it to ground. Bending the leads of SA1 just slightly so that it was away from the edge of the board resolved the problem. Scott N7NB _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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.htm Elecraft web page: http://www.elecraft.com
