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

[Joe Subich, W4TV]

It's possible that there is some intermodulation between the 
timecode and the voice.  What I'm hearing in Sync-AM sounds 
like clipping or crossover distortion that does not seem to be 
present on any other AM signal. 

73, 

   ... Joe, W4TV 
 

> -----Original Message-----
> From: Jack Smith [mailto:jack.smith at cliftonlaboratories.com] 
> Sent: Thursday, November 12, 2009 1:05 PM
> To: lists at subich.com
> Cc: 'drewko'; Elecraft at mailman.qth.net
> Subject: Re: [Elecraft] [Elecraft_K3] K3 Beta Firmware Rev. 
> 3.57: Synchronous AM Detection (AM-S); misc. improvements
> 
> 
> Joe:
> 
> Could WWV/WWVH's 100 Hz time code subcarrier be part of the problem?
> 
> Jack
> 
> 
> Joe Subich, W4TV wrote:
> > I also notice that the tracking will lock up anywhere +/-
> > 25 cycles of nominal.  I've heard one case where AM sync 
> > did not sound particularly good ... that's with some of 
> > the metrological voice broadcasts on WWV/WWVH. Still that 
> > appears to be a case where the sync AM is amplifying an 
> > issue at the source because the normal envelope detector 
> > does not sound very good either. 
> >
> > 73,
> >
> >    ... Joe, W4TV
> >  
> >
> >
> >   
> >> -----Original Message-----
> >> From: elecraft-bounces at mailman.qth.net
> >> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of drewko
> >> Sent: Thursday, November 12, 2009 8:37 AM
> >> To: Elecraft at mailman.qth.net
> >> Subject: Re: [Elecraft] [Elecraft_K3] K3 Beta Firmware Rev. 
> >> 3.57: Synchronous AM Detection (AM-S); misc. improvements
> >>
> >>
> >> I also think the sync det works great. My VFO locks 4 or 5 Hz
> >> high using the 13 KHz filter. The 2.7 KHz filter locks right 
> >> on the money. Switching to the narrower filter will also lock 
> >> signals that are too weak to lock on the wide filter. Not 
> >> that you'd want to use the 2.7 filter for listening to AM 
> broadcasts. 
> >>
> >> 73,
> >> Drew
> >> AF2Z
> >>
> >>
> >> On Thu, 12 Nov 2009 03:59:38 -0600, Dale, K9VUJ wrote:
> >>
> >>     
> >>> 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
> >>>
> >>>
> >>>       
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