"Engineering is *always* about compromises. -- Ron AC7AC" While I certainly agree in theory, I don't think I'm making many with the K3. I picked my roofing filters on the basis of contesting and non-contesting.
For non-contesting there's very little that strains the DSP. For general puttering about with 800-1000 hz CW, the 1.8 roofing is good enough. DSP does it. For puttering SSB, the 5 pole 2.7 does it. For SSB contesting, started with stock in the MP, then 2.1 INRAD's, and finally 1.8 INRAD's. So it's 1.8 in the K3, been there, done that. I never use the 1.8 in puttering mode, I use 1.8 exclusively in contests. For CW contesting, I go on the basis that there is an S9+40 station up 500 hz. I set my roofing filter to the width I want to hear and the DSP to match (400 for running and 250 for S&P). With a 5 element 40m quad on Europe out at NY4A, and certain Europeans running "plentiful" power plus yagis, S9+40 up 500 hz is common past experience, not conjecture. BC carriers are often off scale. In the K3 the 400 clearly whacks down the S9+40 up 500 down to a DSP manageable value. To wit: At home (not NY4A) I was listening to a 40 over BC signal on 7125 last night with the K3 on 8 pole 400. Even turning on the preamp (carrier 60 over tuned in), tuned up and down 500 hz I could hear right down to S3 ish noise on speech breaks with fast AGC on. I could also hear their buzzy 120 hz harmonic residuals (100 db below carrier?) between QRN peaks. All that with no ringing. MP can't get anywhere near that using 2nd and 3rd IF INRAD 400's. Thas what I need. I didn't notice any compromises running around anywhere. Also, FWIW, when I added DSP to my K2's A->B mods it really improved performance. K2 sounds a bunch more like the K3 than the MP, either way you read that sentence. 73, Guy K2, K3 #1239 -- View this message in context: http://n2.nabble.com/K3%3A-2.1-vs-1.8-tp474969p527703.html Sent from the Elecraft mailing list archive at Nabble.com. _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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
