If it is RF feedback, the proper way to deal with it is at the source - in your antenna system.
An easy way to check it is to cut a quarterwave wire for each band that is troublesome - attach one end of the wires to the ground terminal on your tuner and the other end just stretches out and attaches to nothing excpet an insulator. There will be high RF Voltage on the open end of the wires, so keep them clear of human and pet contact and keep them far enough away from objects to prevent arc-overs (treat the far ends sort-of-like the end af an antenna). If these wires correct the problem, then you do have work to do on the antenna system. If they do not help, then you can look further for a K2/100 or KAT100 problem. >From your description, I would think something is causing a very high current draw (even for a very short time) - your power supply may be going into foldback limiting and the K2 powers off momentarily. The other possibility is that the resettable fuse in th ebase K2 is tripping and causing the power off condition (yes - it is powering off since you see the ELECrAFt on the display). Is this by any chance happening most frequently on 40 meters? 73, Don W3FPR > -----Original Message----- > > I have a K2/100 with a KAT100. For the most part, all works well as > expected. > > Intermittently, though, when I press the TUNE button, the KAT100 will > chatter briefly as if finding a match, and then it suddenly stops > and the K2 > acts as if its CPU has been re-set; the bargraph and the LCD go blank > briefly, then the ELECrAFt sign-on message appears briefly and > finally the > frequency is re-displayed. During this time, however, the power supply > indications are normal and the LCD backlight remains on. > > This problem seems to be frequency-dependent and seems to happen > more often > at high power, which leads me to think it is an RF feedback issue. > > However, I've noticed that turning the power down to bottom end of the > high-power range (approx 12 W) usually doesn't help, yet turning > it slightly > lower than that, to get into the low-power range (approx 10 W), does. > > Any advice on how to solve it? > > Thanks > _______________________________________________ Elecraft mailing list Post to: [email protected] 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
