> There's a button labeled "RIT" and an associated knob especially for that > purpose.
Wes, Here's an example of using APF in conjunction with RIT. I normally leave my CW offset at 650 Hz. Some of my CW operating is very weak signal DX on the low bands. When copying extremely weak DX in the midst of static crashes, I need to temporarily shift pitch to less than 400 Hz. Some ops, including W4ZV, have noted that weak CW copy can improve when low pitch is used. I also don't want to tamper with my normal CW offset if I don't need to. By engaging in RIT, I would like to temporally dip the incoming pitch, leave my CW offset alone where I want it 95% of the time, and then adjust the frequency of the APF to match/peak the incoming pitch selected by RIT. If I want to experiment with different pitch settings based on band conditions, I also want the ability for the APF peak to track the pitch I've selected on RIT. That requires a tunable APF. This is precisely what the FT-1000/D gave its users. Of course, the greater the departure of the RIT pitch from the offset may require a wider DSP filter setting and/or roofing filter. But under these weak band conditions, wide DSP and roofing filters are just fine when band activity and adjacent interference is low or moderate. When I'm working early morning grayline DX on 80m or 40m, I rarely encounter strong adjacent stations since conditions are long and stateside is not heard much of the time. Because of this, my overall Rx bandwidth is generally set to 2.8 kHz or greater. Even when weak DX is running split and listening up 2 kHz, there's ample separation to allow a filter settings wide enough to depart a few hundred Hz from the CW offset. Paul, W9AC ______________________________________________________________ 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
