Chuck, you don't need to match the filters if you buy the 8 pole filter which the 400 Hz is, but the extra cost to match the filters is less than the difference between the 8 pole and 5 pole. I have the 2.7K, 500 and 250 and I am happy. The narrow filters only are effective when there is a strong signal in the bandpass of the wider filter. The DSP filter will handle signals that are not really strong. You need the 2.7K for sure but one comes with the K3 and another with the sub-receiver. So the best thing to buy for CW is the 500 Hz 5 pole or the 400 Hz 8 pole. Willis 'Cookie' Cooke K5EWJ
________________________________ From: callen1155 <[email protected]> To: [email protected] Sent: Wed, February 24, 2010 4:30:15 PM Subject: [Elecraft] Determining best roofing filter with DSP?? Hello guys. Sorry about all the questions but I think this is the last one before I press the "buy" button for a K3. Once again a question about cw roofing filters. I am initially ordering the K3 without the 2nd receiver but do plan on getting one within a year. That said, and knowing it's best to have 'matching roofing filters' for both receivers, even after all the reading I still have no idea what would be the best roofing filter to get. It seems to be such an individual choice. Ideally, I'd prefer to purchase only one filter (or one for each receiver) and want to make the best filter choice for my operating. So if I order the K3 with no roofing filters, can I determine from operating with just the DSP which cw roofing filter would be the optimal one for me. Or is the above an exercise in futility and I just need to order say a 400 and see how that does before I'll know? But then again I guess it wouldn't be 'matched'' when I get one for the second receiver. Too many decisions! thanks again. chuck af4xk -- View this message in context: http://n2.nabble.com/Determining-best-roofing-filter-with-DSP-tp4629030p4629030.html Sent from the [K3] mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] 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:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
