Hi Wayne The APF is fantastic. This is the best enhancement to the K3's receiver ever.
The APF performance puts the K3 ahead of every other radio on CW receive. There is just no comparison. Anyone not using a K3 with the APF will be at a huge disadvantage in a contest. The APF is scary with its potential. This is the first time that a DSP ënhancement has impressed me. 73 John --- On Wed, 11/3/10, Wayne Burdick <n...@elecraft.com> wrote: > From: Wayne Burdick <n...@elecraft.com> > Subject: [Elecraft] K3 Beta Release: APF for CW; "Fast Monitor" & improved TX > gate for voice modes > To: "Elecraft Reflector" <elecraft@mailman.qth.net>, > elecraft...@yahoogroups.com, elecr...@yahoogroups.com > Date: Wednesday, November 3, 2010, 1:05 PM > K3 beta-test firmware revision 4.17 > (with DSP rev. 2.65) is now > available. This release includes our new APF (audio peaking > filter) > for CW mode, which has been helping K3 field testers work > "extreme" > weak DX for the past several days. > > For voice modes, there's a "Fast Monitor" option (TX voice > monitor > without the processing delay). Also included is a > much-improved TX > Noise Gate. > > See detailed release notes below. > > Please send any questions to k3supp...@elecraft.com. > For instructions > on how to load beta firmware, see: > > http://www.elecraft.com/K3/k3_software.htm > > 73, > Wayne > N6KR > > * * * > > MCU 4.17 / DSP 2.65 / FPF 1.14, 11-2-2010 > > NOTE: Be sure to install all firmware files for this > release, > including FPF 1.14. Otherwise your menu text will be > incorrect. > > * APF (AUDIO PEAKING FILTER) ADDED: APF provides enhanced > copy of weak signals in CW mode, and is especially useful > when > signals are at the noise level. The K3’s APF is patterned > after > the most successful analog APF implementations, and is > equally > effective in user tests. To use APF, make sure CONFIG:DUAL > PB > is set to APF. (This is the default. “NOR” restores the > original DUAL PB > function.) Then hold DUAL PB to turn APF on/off. A special > DSP > graphic display is used to show that APF is in effect. At > the time > APF is activated, the regular I.F. SHIFT setting, if any, > is “frozen,” > and SHIFT then controls the center pitch of the APF filter > in 10-Hz > steps. APF is independent for the main and sub receivers, > as well > as for presets I and II. Switching between these two > presets is a > convenient way of turning APF on/off quickly. > > * ADDED VOICE TX “FAST MONITOR”: Normally the voice > monitor includes a ~20-ms delay, which is necessary to hear > how your > on-air signal will sound (with compression, etc.). If you > prefer to not > hear any delay in the voice monitor, set CONFIG:TX MON to > FAST. > Note: You’ll still hear the delayed and processed monitor > if you > adjust the MIC, CMP, TX EQ or TX GATE settings while > transmitting. > > * TX NOISE GATE IMPROVEMENT: The Noise Gate/Downward > Expander for voice modes has smoother response and much > improved performance near the threshold. > > * NARROW AF FILTER IMPROVEMENT: Adjusting SHIFT and > WIDTH when using very narrow DSP filters no longer causes > ‘pop’ artifacts. > > ______________________________________________________________ > 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
