[Elecraft] K3: using data modes with MixW

[Julian, G4ILO]

Tom Whiteside wrote:
> 
> I participate in Army MARS nets where MT-63 is used in tandem with voice
> nets.    I would like to be able to use the K3 Data mode to be able to
> automatically switch from microphone to line in and to automatically set
> the compression to 0.    That seems to work but I see MixW display a
> frequency offset when the mode is changed and the transmission is indeed
> offset from where it would be just using SSB.
> 
> The K3 considerately provides an option to combine the mic and line in
> inputs and doing that plus manually turning down the speech compression is
> a very reasonable work around but I am wondering if there is another trick
> in the K3 and or MixW that would allow the original plan of switching to
> data mode to work?     
> 
> 
MixW has an option to enter frequency offsets for each mode, so using that
you might be able to compensate for the shift you are seeing. However I
think the problem is basically because you are (I assume) using LSB for
phone, whereas USB is used by the K3 for data. So I think you need to use
the option in MixW that says default digi mode is RTTYR (i.e. reverse
sideband.) That will make data use LSB. (Not knowing anything about MT-63 I
don't know if that is OK - some modes work on either sideband others don't.)

MixW will display a different frequency in data mode, because it shows the
frequency of the actual data transmission (i.e. carrier + audio offset) not
simply the frequency of the suppressed carrier, as it does in SSB. But it
will not actually change the transceiver frequency switching from LSB to
RTTYR.

-----
Julian, G4ILO. K2 #392  K3 #222.
http://www.g4ilo.com/ G4ILO's Shack   http://www.ham-directory.com/ Ham
Directory    http://www.g4ilo.com/kcomm.html KComm for Elecraft K2 and K3 
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