On Sat,3/7/2015 9:11 AM, Mike Markowski wrote:
If you're a cw operator, I make heavy use of the 400 Hz filter. Not too narrow (usually), and not too wide.
There's a potential misunderstanding here. The plug-in filters are ROOFING filters, and are there to protect the IF from overload by VERY strong signals. The IF bandwidth is NOT dependent on those filters. Rather, the IF in a K3, like the KX3, is filtered by DSP. Those filters DO add to the selectivity of the K3 by virtue of a process called "cascading," whereby they make the K3's filter skirts fall off more sharply when the roofing filter is the same bandwidth or narrower than the DSP IF.
So -- you DO probably need a CW roofing filter if you're a contester, or if you have a close-in neighbor who is active on the same bands when you are. For general operation, the IF is enough.
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]
