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

[Jack Smith]

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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