Hi Don, I use the 250 Hz filter for all low-bandwidth data mods and it works fine. In fact it's usually overkill, however it's worth the protection against the receiver blocking with nearby strong signals.
The 1.8 KHz filter is what I normally use for voice-bandwidth data like MT63. It's about minimum bandwidth (in my case) for use with SSB. Normally, I use 2.8 KHz with SSB receive, holding 1.8 in reserve against QRM nearby the frequency. The 2.7 or 2.8 KHz filter is used for TX. This can't be changed and is perfectly fine for TX in all modes except AM and FM. For data modes, the quality of the output signal is determined by the source (sound card for example). The bettery quality sound card - more bits and more range - the better the TX quality. If you're using one of the K3's internal data modes, the quality of the output is determined by the DSP. No worries there either. 73, matt W6NIA On Fri, 28 Jan 2011 12:33:35 -0500 (EST), you wrote: >Dear All, > >I am debating if I should get a narrow filter for PSK and RTTY work. >Currently the most narrow filter I have is the 8 pole 2.1. > >I am thinking about an Inrad 8 pole 500 hz to add to the K3. I am not >having problem, however, the more I use these modes I find that you will >have very close signals for PSK and I am wondering if this will help in >pulling weaker signals in, instead of depending so much on the DSP. > >I also want to know will this filter also be in use when in TX mode to >help limit the bandwith. I wonder this as I worry about bumping up the >power as signals are so close and I do not want to interfer with others. > >I am asking because I am hoping users can give their experience working >these modes before I purchase the filter. > >I dont want to make the same mistake I made with the 2.1 filter for SSB >where I now wish I would have purchased the 1.8 filter. > >Anyway I will appreciate any and all feedback. > >Thanks >Don > >Don >KD8NNU > > >______________________________________________________________ >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 ______________________________________________________________ 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
