Phil: I'm also primarily a CW operator. I chose the 1 KHz filter for "normal" wide CW contest use when I want to be aware of stations around my run frequency. I chose a 1.8 KHz filter for SSB contesting based on recommendations from friends whose opinions I respect. The 1.8 kHz filter is also helpful for wide CW.
I also have the 400 Hz and 250 Hz eight pole filters. I don't think the 400 and 250 are enough different to recommend that configuration. If you're an RTTY enthusiast, the 250 Hz filter may be just what you need. Upon reflection, I perhaps should have gotten the 200 Hz 5-pole instead of the 250 Hz 8-pole. I ordered this on the first announcement at Visalia, and went with my best guesses. I chose the 2.8 kHz filters for steep skirts and also to avoid matching issues with the sub receiver's filter. I'm not sure they were necessary, but it's all subjective. I didn't want to be in mid-contest and wish then that I'd spent a relatively few dollars more for better skirt selectivity. One reason to choose the 2.8 8-pole over the 2.7 five-pole is if you plan on using a sub receiver. You should either match the 2.7 kHz five-pole filters or get two 2.8 kHz filters. I chose the latter. I don't require ESSB, AM transmit, or FM, and my main RF board is full with 250, 400, 1000, 1800, and 2800 eight-pole filters. I have fewer filters on my sub receiver. Also review Eric's detailed Roofing Filters essay at http://www.elecraft.com/K3/Roofing_Filters.htm Nice to have the choices, but there are a lot of them! 73 de Dick, K6KR -----Original Message----- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Phil Hystad Sent: Wednesday, December 23, 2009 11:41 AM To: Elecraft Reflector Subject: [Elecraft] K3 Filter Option Questions (revisited yet again) One of the things that I have not yet decided is the filters to get for my K3 order. I am firm on getting the 400 Hz 8-pole filter (80 percent or so CW ops). But, I like to scan the band looking for signals with a wider filter, say around 1 to 1.2 KHz. Do I need to get the 1 K filter. If I remember right, I can set DSP filtering to about 1 KHz which may be good enough or is there an advantage to the 1 KHz filter. Also, is there a good reason to swap out the 5-pole 2.7 kHz filter for the 2.8 KHz 8-pole? I presume this gives the filter sharper skirts so you can cut off those close stations a bit better but I am curious as to how much better. Since the dollar cost differences in decisions regarding filters is not that great I would prefer answers that ignore the cost issue. So far, I am planning on getting the following filters with a ? on the 1 KHz 8-pole and 2.8 KHz 8-pole: 400 KHz 8-pole 1 KHz 8-pole ?? 2.8 KHz 8-pole swap for 2.7 KHz 5-pole ?? 6.0 KHz 8-pole 73, phil, K7PEH ______________________________________________________________ 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
