K3 CW filtering
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Hi,
Am readying myself to invest in a K3. I am a CW op, rarely on any other mode, (haven't used any other mode in over four years). I chase DX and enjoy the occasional contest but am not a dedicated contester. On the other hand, I tend to go 100% into any of my endeavours and when I contest, I contest to the best of my abilities. I currently have an Omni V with a set of Inrad CW filters and find them a tad too ringy for my liking though I find the 2.4kHz with the 250Hz narrow filter in line pretty effective. I find the 250Hz filter with the 250Hz narrow filter also selected almost too noisy for my pleasure. Sans ringing, I would love a 50Hz filter but reality says I need something wider. That probably says enough about my CW desires as regards the K3. With that, what filter should I go with to maximise my CW experience? Thanks, Gary KA1J _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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_______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Gary Smith
"With that, what filter should I go with to maximise my CW experience? "
I took the posted advice that only the first 30 dB of attenuation really mattered for a roofing filter, and therefore I ordered the 5-pole CW filters (500 and 200 Hz). I am happy with the choice. The main reason to use the roofing filters in the first place is to prevent the DSP from overloading. I once had a receiver that had FB DSP selectivity but no roofing filters and that would overload ("de-sense") when strong signals were nearby. It is a good feeling to dial the selectivity down to 200 Hz and know that nothing will get through above and below that little window. Ringing doesn't seem to be an issue. Of course, YMMV, and other people feel good about having the steeper skirts of the 8-pole filters. 73, John W2XS K3 #919 (etc.) |
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In reply to this post by Gary Smith
----- Original Message -----
From: "Gary Smith" <[hidden email]> > > With that, what filter should I go with to maximise my CW experience? > Like John W2XS I went with the 500 & 200 Hz filters. In CQ WPX CW I could slowly tune up 20M and work the European stations in between the loud east coast stations - it was like they were not there. Very impressive! And no ringing. I have not cranked the width down to 50 Hz, but the times that I did were pretty effective. I had a 1.8 filter that I thought was going to be good for SSB and OK for CW. I didn't like it on SSB and it was too wide on CW - stations 1 KHz away would nail the AGC, so I traded it for a 1.0 filter. So .... for CW I believe that the 1.0, 500, 200 is an excellent combination, although I have not had the chance to use the 8 pole narrow CW filters if one is to believe the numbers that W4ZV, W4TV, and others have come up with comparing the 5 and 8 pole filters, it doesn't appear that there is a whole lot of difference between them. At least not to the average human ear! That's how I see it here in the woods in MI! 73 Hank K8DD _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by John W2XS
>"With that, what filter should I go with to maximise my CW experience?" I ordered the default 2.7 kc 5-pole and added a 500 cycle 5-pole for CW, and the performance is far beyond my expectations. Most of the time I operate CW with the DSP set to 300 to 500 cycles, so the 500 cycle roofing filter is always in the circuit when I'm operating CW. Paul N4LCD _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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