[Elecraft] [Elecraft_K3] K3 Beta Firmware Rev. 3.57: Synchronous AM Detection (AM-S); misc. improvements

[dalej]

Installed 3.57 this morning.  I am listening to Radio Zealand now, at  
0945 Z on 9765 Khz.  Sync det seems to work very well.  I'm trying it  
back and forth between AM and AM-S.  I am using the VFO tracking and  
it locked right on, but my VFO display reads 9.764.991.  Perhaps I'll  
have to re-check calibration sometime, no biggie here.  I like this  
sync det.  It now makes me wish I had the 15 Khz filter in addition to  
my 6 Khz. filter.

Thankyou Elecraft for another flawless upload.  Am using the Mac and  
that utility which also has been flawless here.

73
Dale, K9VUJ


On 10, Nov 2009, at 20:33, 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 k3support at 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.
>
>
>
>
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