[Elecraft] Problem setting up K3s with WSJTv1.7

[Jim Miller]

I'm seeing some problems getting the audio right with 1.7 with my K3s. I'm
in DATA-A mode.
I'm using the K3s internal USB audio device.

I have the power slider on WSJT near the max, setting it completely to the
max causes K3s audio input overload regardless of where I set the Windows
Mixer input slider. I have the Windows mixer levels for the K3 set to
-7.7db. With these settings the K3 Input level shown on the mixer panel is
about 70% when tone is asserted by Tune which seems acceptable, i.e. not
saturated.

I then adjust the LineIn level on the K3s. When the level is too low (e.g.
3) the ALC meter pulses with about a 0.5 second rate between no bars and 5
bars. LineIn set to 4 shows the same pulsing but between 4.5 to 6 bars.
Setting LineIn to 5 yield a more stable display but still oscillating
between 6-7 bars.

This pulsing/oscillation doesn't seem right to me. With a steady Tune tone
from WSJT I would expect a steady rather than pulsing/oscillating ALC
display.

BTW, this is true even in K3S Test mode so no RF is being generated.

PC is bonded to the K3s rather well.

I even removed the K3S Aux connector to ensure something wasn't getting in
that way.

I'm also seeing a power spike on the initial tone assertion in Echo mode.
So I did a TX gain calibration at 5 and 50w and still see the same. The
power spike is what got me looking more closely at the ALC levels.

My next test will be putting a scope on the K3S to look to see if there
really is a RF power spike or something is screwy with my newish ACOM 1500.
I haven't seen any power spiking on CW modes.

I'd like to also look at the audio input level from WSJT but don't have a
good idea on how to do that since the internal K3S audio codec is being
used. Perhaps the headphone out level would show the spike (if it is being
generated by WSJT) as well if AGC is off?

Suggestions welcomed!

73

jim ab3cv







.