I agree with Jim, very strong signals will wash out a waterfall but have very little effect on decodes. I have decoded extremely weak signals only a fewHz away from strong signals. I leave filters at 2700hz and NEVER use anotch filter on any WSJT modes. 73, Dave N4DB
On Sunday, August 27, 2017, 6:41:03 PM EDT, Jim Brown <j...@audiosystemsgroup.com> wrote: All very good advice. BUT - how close is he? How much bandwidth is he occupying? How many dB down at how many Hz from the center of his signal? AND VERY important -- K1JT has repeatedly advised to NOT to any filtering ahead of WSJT-X, because the phase shift associated with the filter degrades decoding. I have locals in the range of 5-20 miles from me and both they and I are running power (me, a KPA500). Depending on what direction each of our antennas are pointed, the "red" can be pretty wide. But that does NOT mean that WSJT-X cannot decode signals in that red zone! Further, the colors in the waterfall are absolute level at input to WSJT-X. ANY signal will have sidebands. If, for example, he's 40 over S9 (not unusual at two miles), even the cleanest of radios with modulation will be S9 within 200-300 Hz of his signal. 73, Jim K9YC On 8/27/2017 11:07 AM, Bob McGraw K4TAX wrote: > A couple of things to check. Be sure the Line Output from the radio is not > set to high such that it is driven into distortion. > > Also check the computer CODEC gain isn't too high and it being driven into > distortion. This is set in Windows Sound device Recording Level. > > Also make sure the ALC is ON and handling the signal. Perhaps some attention > on the input of the receiver is in order. > > The receiver Noise Blanker should be OFF. ______________________________________________________________ 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 Message delivered to dhbl...@yahoo.com ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
