[Elecraft] K3: data modes - bizarre behavior

[Richard Ferch]

Yes, of course, but that is not in the least surprising. The question 
is: Why doesn't RMS Express work properly in DATA A mode? This is 
precisely the kind of application that DATA A was intended for.

73,
Rich VE3KI


On 02/01/2012 7:53 AM, W4GRJ wrote:
> I use RMS Express Winmor,  DSM780&  FlDigi MT63, Airmail Pactor and MIL110A, they all work perfect with the rig left in USB.
>
> Jack
> W4GRJ / AFA4DG
>
> On Jan 2, 2012, at 3:43, Richard Ferch<ve3iay at storm.ca>  wrote:
>
>> W4GRJ wrote:
>>
>>> Just leave the K3 in USB, do not change to data mode. RMS Express will set to
>>> the correct freq. You will not have to make any adjustments.
>>
>> If this is correct, and RMS Express tunes to the correct frequency in
>> USB mode but not in DATA A mode, then there may be an error in RMS
>> Express. DATA A is exactly the same as USB except for disabling
>> compression and EQ and the default choice of input audio path (line in
>> instead of microphone). In particular, the frequency display in DATA A
>> and USB is the same. A setup that works in USB should work in DATA A
>> without changes.
>>
>> What I suspect might be happening is that RMS Express might be
>> programmed to handle DATA A as if it were a USB version of AFSK A. In
>> AFSK A, the K3's dial displays the RTTY mark frequency, whereas in DATA
>> A the dial displays the suppressed carrier frequency. If the RMS Express
>> programmers assumed that in DATA A the radio's indicated frequency was
>> the center of the bandpass instead of the suppressed carrier frequency,
>> they would program it to tune the radio 1.5 kHz too high in DATA A.
>>
>> 73,
>> Rich VE3KI
>>
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