[Elecraft] [K3S] WSJT-X v1.80rc1 FT8 Even/Odd Noise Difference?

[Bob McGraw K4TAX]

I'll be glad to make and supply screen shots of my WSJT-X and K3S set-up 
if anyone wishes.   I find all works correct with the values and 
settings I use.   I do use DATA A mode thus only one USB cable from the 
radio to the computer.

73

Bob, K4TAX


On 8/26/2017 10:05 AM, Don Wilhelm wrote:
> Bret,
>
> I am not certain why that document says to choose the Microphone and 
> Speaker.
> Normal DATA A modes will use LINE IN instead of microphone and LINE 
> OUT instead of speaker.
>
> In other words, you may be overdriving the input to the soundcard 
> which will give you a 'funny' waterfall display as well as being 
> varied by the AF Gain control.  The LINE IN gain on the K3/K3S is 
> controlled by the LINE IN menu setting, and once set will remain 
> fixed.  You can also use the computer soundcard slider to adjust the 
> volume.
>
> Similarly, the microphone level when microphone is selected for the 
> K3/K3S input may prove to be difficult to adjust for the required 4 
> bars on the ALC meter with the 5th bar flashing.  It should be better 
> to use the LINE IN setting.  The MIC GAIN is used to control the LINE 
> IN level when LINE IN is selected.
>
> Remember with Elecraft gear to set the audio as described - 4 bars on 
> the ALC meter with the 5th bar flashing is the NO ALC point for the 
> K3/K3S/KX3/KX2.  Do not attempt to control the power with the audio 
> level, set the audio as indicated and control the power with the POWER 
> knob.  Yes, Elecraft controls power differently than other amateur 
> transceivers.
>
> 73,
> Don W3FPR
>
> 73,
> Don W3FPR
>
> On 8/26/2017 10:29 AM, MaverickNH wrote:
>> On my K3S/100 using WSJT-X set up as per http://tiny.cc/K3S-WSJT-X with
>> v1.80rc1 on FT8 I adjust my RF knob to a 30dB noise level. I often 
>> see ~10dB
>> difference between even/odd 15sec cycles with no visible difference in
>> background noise on the waterfall. That is, at 28-32dB on even I 
>> might see
>> ~40db on odd. Is this just faint signals on one 15sec cycle not 
>> apparent on
>> the waterfall on the other 15sec cycle? But if I hunt around for open
>> waterfall areas I seem to always see that ~10dB difference. Hmmm...
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