On Fri,2/26/2016 8:50 AM, lstavenhagen wrote:
Quick question - do the 8 pole roofing filters have more attenuation, as a general rule, in their passbands than the 5 pole?
Yes, but the difference doesn't matter -- it's in the IF, not the front end. Further, there is an menu adjustment for each filter to equalize the IF gain when switching between filters.
The advantage of 8-pole filters is smoother response in the passband of wider filters, and steeper skirts. In general, roofing filters are only needed for high QRM conditions like contesting. Their function is to protect the DSP from overload by strong signals outside the desired passband. When the DSP IF is set to a bandwidth close to that of the roofing filter, the two filters cascade to provide even steeper skirts. Again, needed only under contest conditions.
It's amazing the things one can learn by reading the manual. :) 73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
