Joshua, If you primarily operate CW or other digital modes, try using Rx Equalization and drop anything above about 800 Hz by anywhere from 0 to -16dB. I think if you operate primarily SSB you are stuck with having to have Rx Equalization pretty much open above 800 Hz.
73, Tom - W4BQF -----Original Message----- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Fred Jensen Sent: Tuesday, March 24, 2015 10:49 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] KX3 Roofing filter question Joshua, Probably not. The ultimate BW of your receiver is set by the DSP and noise power is "sort of" proportional to BW. The purpose of the roofing filters is to protect the ADC sampler at the head end of the DSP from very strong signals that could drive it to saturation. Noise, other than atmospheric and galactic, needs to be attacked at the source. Like getting rid of your switching wall warts and power supplies. So long as the atmospheric noise is not saturating the ADC, reducing the DSP BW is the only really effective way to reduce it's impact, and that's a lot easier on CW than on SSB. Different roofing filters are not likely to make much difference at all unless they're more narrow than your DSP setting. On 3/24/2015 7:24 PM, Joshua Gould wrote: > All, > > Would the roofing filters help reduce atmospheric noise? I'm having a > heck of a time hearing anything over the S5 noise levels that I seem > to be dealing with of late. But at least it's better than the S9 > noise I was getting from switching power supplies under my desk... > > > 72, > Joshua Gould > K8WXA > EM89pn ______________________________________________________________ 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 alderm...@windstream.net ______________________________________________________________ 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
