On 7/25/2017 7:11 PM, Bill Breeden wrote:
I found that I was missing stations that were calling on the skirts of my 400 Hz filter, so I added a 1 kHz filter. When I tune the band to answer CQs I still prefer listen through the 400 Hz filter.
It's important to remember that IF bandwidth is determined by DSP, and continuously adjustable. The plug-in filters are ROOFING filters -- their primary function is to protect the DSP from overload by very strong stations outside the bandwidth of the DSP IF. They have the secondary function of adding the filtering provided by the DSP, and when the DSP and the roofing filter are at the same bandwidth, the filter skirts become steeper (sharper).
Bottom line -- we don't need to buy a 1 kHz filter to get 1 kHz IF bandwidth, because the DSP already provides that. This is not your grandfather's radio! :)
73, Jim K9YC ______________________________________________________________ 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
