[Elecraft] MMTTY DATA-A or FSK

[Joe Subich, W4TV]

> 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?
>
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