[Elecraft] MMTTY DATA-A or FSK

[Brian Moran via Elecraft]

We used two K3s for a M/2 in last weeks's contest, and did over 2000 Q's; I second the N1MM / FSK recommendation, as there are few variables to manage if I don't have to worry about TX levels. 


Also, it's definitely an opinion, but on the receive side, I personally dislike seeing other ops using ENTERLFs in macros during contests, as it can lead to "chasing the information up the screen" on the receive side. It's possible to click on a call in the MMTTY receive window to get it to enter into the logger using N1MM/MMTTY, which is one of the nice features. With ENTERLF printing, if one clicks a fraction of a second too late, the information has scrolled.  A couple of spaces (double bag!) can do the job of resetting the decoder to letters instead. Don't even get me started on unusual exchanges. A long exchange that's different from everyone else e.g. "PLEASE COPY 5NN CALIFORNIA CALIFORNIA BTU" instead of "599 03 CA" isn't doing you any favor.


Don't forget the K3 has a built-in data decoder, for an additional vote on what the other station sent, if MMTTY and 2-Tone aren't enough.


Brian N9ADG



On Thursday, October 2, 2014 6:00 AM, "Joe Subich, W4TV" <lists at subich.com> wrote:
 



> risk is any off frequency noise from the sound card, harmonics etc
> will also get transmitted not really a big issue if the sound card is
> good quality.

Not quite accurate ... one can have a professional quality sound card
and if the levels are too high, the connections are not correct, the
ground gets opened, one has a significant degree of common mode RF on
the feedline, one has power supply issues, etc. DATA_A can be very
badly distorted/wide.  AFSK A is not subject to those issues as long
as the narrow filter (CONFIG: AFSK TX) is enabled.

73,

    ... Joe, W4TV


On 2014-10-02 7:30 AM, david Moes wrote:
> With AFSK-A  the K3  has very a narrow DSP filter to maintain a really
> good transmit IMD  so you need to keep the modulating frequencies
> within  the chosen preset filter range  1275 in my setup.  You can use
> the waterfall to tune but you need to use DATA-A instead of AFSK-A risk
> is any off frequency noise from the sound card, harmonics etc will also
> get transmitted   not really a big issue if the sound card is good
> quality.   I found that with the P3 the markers lined up with the mark
> frequency  so tuning with the VFO was quite convenient without the P3  I
> may have been more tempted to use Data-A and tuning with the mouse
>
> David Moes
> President: Peterborough Amateur Radio Club.
> dmoes at nexicom.net
> VE3DVY,  VE3SD
>
> On 10/2/2014 06:32, David Cole wrote:
>> Why only tune the radio, and not use the Waterfall?
>
> ______________________________________________________________
> 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
> Message delivered to lists at subich.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
Message delivered to brianmo at yahoo.com