You nailed the proverbial nail on the head. The combination of narrow roofing filter, great DSP filtering, cut-off and the feature of zero-beat the pitch to the other station works magic in those pile-ups. Unfortunately, the CWT is not really useful when the DX working SPLIT. In this case you have to rely on your ears to match the tone of the station currently in QSO with the DX using the SUB. After practicing for a while I am able to come pretty close to call on the same frequency where the last QSO was just ended. Works almost every time. In my opinion, the APF is the work in progress, just too much ringing when the frequency is noisy. When the band is quiet and the signal is just very weak, the APF works fine. Somebody mentioned to add Q adjustment. I agree. I would even propose to add this adjustment INSTEAD of APF position adjustment with the SHIFT knob. The position is better adjusted with main VFO in FINE mode. Just an opinion.
73, Igor, N1YX -----Original Message----- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of John Harper Sent: Monday, November 29, 2010 7:25 PM To: Elecraft Subject: [Elecraft] APF in CQWW; and DXing in general w/K3 The past weekend's CQWW was the first time I've had the opportunity to use my new K3 in those types of band conditions and I'd been looking forward to doing just that. I S&P'ed the whole 'test and used it to tweak and twiddle with the K3's various functions, notably the NB settings. I didn't use APF that much due to the pace of the contest but there were two occassions where an On/Off comparison was the difference between me copying the stations or not copying. There were probably more than two but these stick out in my mind because they were both new band-countries on 80m (KH2, UA0), so I was motivated and thankful to be able to get them logged. The real amazement to me wasn't the APF but the ability to tune to a pile-up at 500Hz, hearing an amalgam of callsigns, then dial the selectivity down and hear the target revealed in splendid isolation. Pile-ups were fun and I think of them as a cross between chess and fishing. I'm at a loss as to how to explain the ability to get thru a pile-up on 80m with 100W and a dipole but I'm beginning to believe it's due to the abilty to precisely zero-beat, as opposed to the more general way I was doing it before with the wider selectivity necessitated by my previous rig. Results in the contest seem to confirm that for me. John AE5X http://www.ae5x.com/blog ______________________________________________________________ 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
