[Elecraft] Data A default frequency center

[Joe Subich, W4TV]

Even with JT65A (JT65-HF) one does not want Fc=1.26.  The JT65 decoder
looks for "sync" tones at 1.26 +/- 1 KHz but since the actual JT65
signal extends up about 250 Hz from the sync tone, the filter should
pass *at least* 250 - 2500 Hz (L0=0.25, HI=2.50 or BW=2.20, FC=1.38).

Since "NOR" in DATA A is FC=1.50, BW=0.40, the easiest way to handle
a different "default" is to save modified values as NORM1 or NORM2
and recall the appropriate one rather than <NOR>.

73,

    ... Joe, W4TV


On 9/25/2012 10:56 AM, Matthew Zilmer wrote:
> Well, technically, DATA A doesn't need a way to change Fc.  Since the K3 doesn't actually process anything in DATA A, it's all up to whatever external sound you're using.
>
> There was some yammering about allowing a shift of Fc for DATA A, for example to 1.28 KHz, a while ago.  This was for JT65A which has an offset center from the nominal 1.5 KHz used in DATA A.  I don't recall the results of that email thread, because it was several years ago.
>
> No - whatever issues you find, you're not alone on this reflector.
>
> 73,
>
> Matt Zilmer
> Consultant - Product Management Dept.
> Magellan Navigation / MiTAC Digital Corp.
> Tel: (909) 394-6052
> Cell: (909) 730-6552
> In status quo voluntas non sufficit
>
>
> -----Original Message-----
> From: jmb-f5lci at orange.fr [mailto:jmb-f5lci at orange.fr]
> Sent: Monday, September 24, 2012 4:16 PM
> To: elecraft at mailman.qth.net; Matthew Zilmer
> Subject: Re: [Elecraft] Data A default frequency center
>
>
> Thank you,
> I had tried PITCH without result for DATA A I feel less alone...
> 72
>
> Le Mon, 24 Sep 2012 22:52:28 -0000, Matthew Zilmer <mzilmer at magellangps.com> a écrit:
>
>> Here's the K3 OM's comment on the PITCH control:
>>
>> PITCH
>> CW sidetone PITCH,
>> PSK center pitch,
>> FSK / AFSK MARK tone and
>> shift (pg. 31), or FM tone setup (pg. 29)
>>
>> For DATA A, the manual doesn't really state how to shift Fc.
>>
>> Matt Zilmer
>> Consultant - Product Management Dept.
>> Magellan Navigation / MiTAC Digital Corp.
>> Tel: (909) 394-6052
>> Cell: (909) 730-6552
>> In status quo voluntas non sufficit
>>
>>
>> -----Original Message-----
>> From: elecraft-bounces at mailman.qth.net
>> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of F5LCI
>> Sent: Monday, September 24, 2012 1:49 PM
>> To: elecraft at mailman.qth.net
>> Subject: [Elecraft] Data A default frequency center
>>
>> It is *1.50 by default.
>> As I often use JT65 and no other data mode, how to set it to *1.28 by
>> default ??
>>
>> 72 from FO land
>>
>>
>>
>> --
>> View this message in context:
>> http://elecraft.365791.n2.nabble.com/Data-A-default-frequency-center-t
>> p7563234.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 at 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 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>