Hello Ron W3ZV. New owner of K3 2324 here. Noise at my QTH is local (lights, powerlines, electrical demand) that runs S5-9+ on SSB, depending upon time of day. It's more on AM, less on CW/Data modes. And that's on everything from my 160-L , 80 dipoles, to 3-El Steppir beam. Depending upon band, the K3 takes it at least 2-3 S units down via the dual NB's, and substantially improves the signal selectivity with the NR. I also use a Wellbrook loop for receive, which really helps with eliminating local stuff by 2-4 S units depending upon the source.
I set my IF NB to 1-6, and the DSP NB to 1-6 or 2-6. Check for fidelity on SSB and CW. The NR works for me at 1-1/2 or 2-1/2. Narrow filters are better, and the NB's settings can vary by band. I would be concerned about your S2-3 w/o the antenna connected. If removing the antenna does not quell the noise to S0, then I suggest you have common-mode RF ingress from either your power supply, house wiring, or whatever else your K3 is connected to. See Jim K9AY's article on how to deal with this noise: http://audiosystemsgroup.com/RFI-Ham.pdf. I did and it worked for me. I used Fair-Rite Type 31 beads on every cable and coax in the shack. I also used a Tripp-Lite Ultra power conditioner on the 120V feeds, and ferrite beads on the 240V for the ACOM amp. Two to three S units of noise were lost via the common-mode suppression described. 73 and Merry Christmas from Santa Land -- View this message in context: http://n2.nabble.com/K3-and-noise-tp1695565p1802028.html Sent from the Elecraft mailing list archive at Nabble.com. _______________________________________________ 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
