Installed already this morning the new Beta FW 3.25 in my K3 # 2192 and the difference is day and night,not only the NR works great now but also the low freq end on Rx audio extended down to 40Hz on SSB and AM as well.When NR is enabled now the audio remains with the same quality,only reduce the level a little bid but the noise is gone more than 50 percent at least,and the best of all is that I don't hear anymore the hollow sound that all NR has in other radios,it sounds natural,great job Wayne,day by day we all like this radio more and more,73 to all
AD4C "The difference between genius and stupidity is that genius has its limits".. -- Albert Einstein --- On Wed, 8/12/09, wayne burdick <n...@elecraft.com> wrote: From: wayne burdick <n...@elecraft.com> Subject: [Elecraft] K3 FIRMWARE, Rev. 3.25: Improved NR, 10-Hz SHIFT steps, Received CW WPM display, VFO noise reduction, etc. To: "Elecraft Reflector" <elecraft@mailman.qth.net> Cc: elecraft...@yahoogroups.com, elecr...@yahoogroups.com Date: Wednesday, August 12, 2009, 7:49 PM K3 beta-test firmware revision 3.25 (with DSP rev. 2.21) is now available. There are several new features and significant improvements in this revision; see release notes below. Please send problem reports to k3supp...@elecraft.com. Beta firmware load instructions can be found at http://www.elecraft.com/K3/k3_software.htm 73, Wayne N6KR * * * MCU 3.25 / DSP 2.21, 8-11-2009 New Features: * NOISE REDUCTION (NR) IMPROVEMENTS: Our new NR algorithm has less impact on signal strength, and should no longer make some weak signals “disappear” due to over-processing. We may fine-tune the algorithm in future releases, based on operator evaluation, but we’ve have good reports from early testers.. * VFO TUNING NOISE REDUCTION: Some operators have reported hearing noise on 60, 10, or 6 meters when tuning the VFO under very quiet conditions. If you experience this, try the following: In the CONFIG:VCO MD menu entry, tap ‘1’ until you see “SPI 2” (the default is “SPI 1”). This alters the timing of data sent to the synthesizer, which in turn changes the spectrum of SPI-bus signal noise. It has no impact on performance. You will also need to add two resistors and two diodes to the bottom of the RF board (see application note on our K3 modifications web page). * AUTOMATIC RECEIVER FRONT END PROTECTION: If the K3 is operated too close to high-power transmitters, it’s possible to damage some receiver components. While this rarely happens, we’ve taken steps to prevent it by sensing a high-current condition at the mixer post-amplifier (Q8/Q9) and automatically turning off the preamp and, if necessary, turning on the attenuator. You will need to add one jumper wire on the bottom of the RF board (see application note on our K3 modifications web page). If you don’t add the jumper, operation will be unchanged; firmware can sense whether or not you’ve installed the jumper. * 10-HZ PASSBAND SHIFT STEPS (EXPERIMENTAL): If CONFIG:PB CTRL is set to SHIFT=.01 for a given operating mode, the SHIFT control will provide .01 kHz (10 Hz) steps rather than the original .05 kHz (50 Hz). Especially useful with narrow filter bandwidths. This feature is experimental and has some limitations at present: Applies to CW and DATA only; LOCUT/HICUT cannot be used when 10-Hz SHIFT steps are in effect; WIDTH steps remain 50 Hz in all cases. Not compatible with spur removal function yet (CONFIG: SIG RMV); signals mapped out may reappear. * CW SPEED DISPLAYED WITH DECODED CW TEXT: If the TEXT DEC switch parameter is set to WPM CHK (using VFO B), the speed of on-air CW signals will be shown, along with a small window of CW text. You might see “18w. CQ…”, where “18w.” means 18 WPM. Both text decode and WPM display accuracy can be improved by using narrow filtering and by careful adjustment of the “THR” (threshold) parameter (set with VFO A when the TEXT DEC switch is pressed). * RF GAIN CALIBRATION: The K3’s hardware AGC circuitry can now be calibrated. This may improve both S-meter and RF GAIN control accuracy. To do RF GAIN calibration, use revision 1.2.7.24 or later of K3 Utility (use the RF GAIN calibration function, under Configuration). This procedure calibrates both main and sub receivers. A signal source is required. Future firmware revisions will further improve accuracy, using the calibration data stored by this procedure. Misc. Improvements: * "SK" IS NO LONGER DISPLAYED IN RESPONSE TO NOISE DURING CW DECODE. Incorrect characters are now displayed as ‘*’. * 6 METER SCANNING NO LONGER PROHIBITED. Scanning is limited to the 6-m U.S. ham band (50-54). Exception: In some countries the K3 won’t operate on 6 m at all. * TTY CENTER FREQ NOW DISPLAYED CORRECTLY: In FSK-D and AFSK-A modes, rotating SHIFT now shows the exact center pitch (when indicated by an asterisk). The four available center pitches are 1000, 1360, 1530, and 2210 Hz. Previously the pitch was rounded down to the nearest 50 Hz. For Software Developers: * "RO" COMMAND (RIT/XIT OFFSET READ/SET) ADDED. This command provides a more direct way to set up the RIT/XIT offset, as an alternative to “RU” and “RD”. Set/Response format: ROsxxxx; where s is +/-, and xxxx is 0000-9999. --- http://www.elecraft.com ______________________________________________________________ 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