Hi Wayne This was one of the features that I 'really' wanted in the K3 and I am so pleased it works so well.. Enjoying my SW listening all the more now Thanks!
73 John VE3NFK wayne burdick wrote: > > K3 beta-test firmware revision 3.57 (with DSP rev. 2.45) is now > available. > > This revision includes Synchronous AM detection, which has a clear > advantage over the regular AM detector during selective fading. In > this mode, the K3 can optionally track AM stations that may be > slightly mistuned, as you might find in an AM round-table on 75 m. > It's also convenient for automatically zeroing in on AM broadcast > stations. > > There are other considerations when using Synch AM, so you should read > the release notes (below) before trying it. We'll be further refining > our AM-S implementation in a later release, based on your feedback. > > 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 3.57 / DSP 2.45, 11-7-2009 > > Misc. Improvements: > > * TUNE SWITCH: “Double beep” with NR on eliminated. > > * DATA A: Loss of power when using TUNE corrected. > > New Feature: Synchronous AM Receive > > * SYNCHRONOUS AM: Outperforms regular AM during selective fading. > Provides optional automatic VFO tracking of AM signals up to +/- 2.5 > kHz. > > Select AM mode, then hold ALT to select AM-S. The -S icon flashes > slowly if the signal is noisy. Select AM-S LSB or USB using SHIFT; > one of the two sidebands may reduce QRM. Sync AM also works with > diversity receive. (Note: Some AM broadcast stations encode their > carrier, resulting in a low-pitched noise when Sync AM is turned on.) > > With Sync AM you can tune manually, or use automatic VFO tracking: > > -- If tuning manually, you need to tune to within +/- 10 Hz of the > actual > carrier frequency, at which point the K3 will phase-lock to the > carrier. > > -- To enable VFO tracking, tap CWT, which turns on the T icon. Or, > tap SPOT to engage VFO tracking just long enough to lock. When > tracking is on, the VFO may “hunt” slowly across a span of several > Hz. > > IMPORTANT: For AM QSOs, use SPLIT mode when VFO tracking is > turned on. VFO B (TX) will remain fixed while VFO A tracks RX signals. > > Limitations: At present, VFO B cannot auto-tune in AM-S. Also, both > VFOs will always be in the same mode (AM-S LSB or USB). > > Remote Control Command Changes: > > * UP0/DN0/UP$0/DN$0 moves VFOs 1 Hz. Similarly, UP8 and UP9 > move the VFOs by 100 and 200 Hz, respectively. > > > ______________________________________________________________ > 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 > > -- View this message in context: http://n2.nabble.com/K3-Beta-Firmware-Rev-3-57-Synchronous-AM-Detection-AM-S-misc-improvements-tp3983997p3990331.html Sent from the Elecraft 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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
