This just establishes the low-pitched rolloff by adjusting the filter position relative to zero-beat.
Setting it to 0.1 or 0.2 (the default) will have the least impact on the CW passband. 0.1 provides better low-end audio. 0.3 is for cases where you have such extreme signals that you need to lop off a bit more of the low end to eliminate any vestige of low-pitched opposite-sideband signals. For 99% of users, 0.1 or 0.2 will suffice. Shifting the crystal filter center frequencies should not be necessary. I recommend just sticking with the offsets printed on the filters (0.00 for all 8-pole filters). 73, Wayne N6KR On Feb 5, 2014, at 5:40 AM, Mike K2MK <k...@comcast.net> wrote: > I installed the 4.81 beta firmware and I am able to change the crystal filter > offset as described in the firmware notes. I can hear slight differences in > a CW signal between 0.1, 0.2, and 0.3 KHz. What I don't understand is what > does it mean. Previous to this release I would have assumed that the crystal > filter is centered on my chosen CW pitch suggesting a 0 KHz offset. If I > choose one of the 3 offsets am I now listening (and transmitting) slightly > off zero beat. Why would I want this? Wouldn't I also want a 4th choice of 0 > KHz? > > Explanations in layman's terms would be appreciated. > > 73, > Mike K2MK ______________________________________________________________ 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
