VAC 4.60 tuning for usage with JTDX/WSJT-X.

Created by Igor UA3DJY on March 15th, 2019.

1. Install both WSJT-X and JTDX, set VAC Line 1 as output audio device in WSJT-X and input audio device in JTDX, push Tune button in WSJT-X and monitor signal in JTDX waterfall.

There is an example of the dirty signal with multiple breaks:

VAC1

 

Check VAC ‘ms per int’ settings:

VAC2

 

and reduce value there until signal breaks will disappear (you will have to switch off JTDX/WSJT-X to get permission to change this value):

VAC3

VAC4

Now try to change audio TX frequency by the CTRL+click in WSJT-X waterfall, monitor signal in JTDX, there is the normal behaviour:

VAC5

In some setups broken spectrum can be observed at frequency change, for instance like this one:

VAC6

If you getting such behaviour then run VAC control panel as admimistrator and try to change there capture and render ports from Auto to WavePci (you will have to switch off JTDX/WSJT-X to get permission to change this values):

VAC7

WavePci is hardcoded as capture/render port in VAC 4.15. Now try change TX frequency in WSJT-X and make sure that proper port selection have eliminated broken signal in your setup:

VAC8

Set this settings to every VAC cable being used in JTDX/WSJT-X. Now you are ready to go on air.