[Elecraft] MMTTY DATA-A or FSK

[dmoes at nexicom.net]

 Joe  you are correct that if there are physical problems and poor 
adjustments it will be bad  but I was assuming a good working setup 
with a quality sound card that is properly adjusted at both the 
computer and K3 that it will be fine.

    I hope that they add the ability to monitor Transmit signal on the 
P3 to see how it looks going out.  however you can see your real 
signal by watching your signal on the many online SDR's, 
http://websdr.org/,  that have waterfall displays in real time.


David Moes
VE3DVY


On Thursday 02/10/2014 at 9:01 am, "Joe Subich, W4TV"  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?
>>
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