[Elecraft] K3 Firmware 2.10,1.81 problems

[Joe Subich, W4TV]

I suspect this is an issue of MixW not correctly interpreting the 
information received from the K3.  When in Data modes, the frequency 
reported by the K3 will vary depending on which data sub mode is in 
use. 

Data      Default
sub-mode  sideband   Reported frequency

 FSK D      LSB      RTTY MARK 
AFSK A      LSB      RTTY MARK 
DATA A      USB      USB/LSB "CARRIER" frequency 
 PSK D      USB      RF frequency (carrier +/- 1 KHz)

MixW assumes data modes from the K2 are LSB (there is no separate 
K3 driver).  The firmware "error" prior to the new beta caused 
MixW to get the sideband right for Data A by chance.  Mix W's K2 
setting assumes that the CAT data represents VFO frequency (or 
carrier) instead of 'MARK' as the K3 reports.  If you use FSK D 
and AFSK A with a "standard"  2125 Hz Mark, set the Digi "Cat 
correction" to -2125.  If you are using FSK D, set "FSK center 
fq" to 2210 [(2125 + 2295)/2] ... if you are using AFSK A, check 
"AFSK in place of FSK" 

With Data A, I’m afraid that the author of MixW will need to  
create a new K3 driver that assumes USB operation in data modes. 
Ideally, before then Wayne will have time to implement separate 
"mode" get/set commands (on the list) for the digital submodes 
(FSK D: MD6;/MD9;, AFSK A: MD8;/MDC;, and DATA A: MDA;/MDD;) so 
MixW (and other digital software) can tell which mode is being 
used from the IF; response.  Then when the authors of MixW (and 
other software) do K3 specific support they will be able to 
properly need to do a K3 setting to reflect carrier vs. RF and 
sideband for each of the digital sub-modes. 

73, 

   ... Joe, W4TV 
 



> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Andrew Forrest
> Sent: Friday, June 27, 2008 6:31 AM
> To: elecraft at mailman.qth.net
> Subject: [Elecraft] K3 Firmware 2.10,1.81 problems
> 
> 
> Dear All.
> 
> operating a K3 with latest beta firmware, using PSK on data 
> modes with MixW. The frequency display on MixW now shows 
> incorrect frequencies for the signals received in data mode. 
> On SSB frequencies displayed appear correct. On data they 
> appear about 3KHz low and on data reverse about 3KHz high. 
> This tested on 20m band.  Everything OK before update.
> 
> Anyone else seeing this behaviour? or is it me that has the 
> problem?
> 
> thanks
> 
>   73 Andrew M1KAZ
> 
> 
> 
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