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

[Don Wilhelm]

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...