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How to set DAX TX Gain programmatically?

Howard K7JNX
Howard K7JNX Member ✭✭
in SmartSDR API

I'd like to modify the DAX TX gain from a program but cannot discover how to do it by watching with Wireshark.

When I manipulate the DAX RX gain slider in SmartSDR DAX 3.7.3 it is easy to see commands going to the radio, e.g. C37097|audio stream 0x4000009 slice 0 gain 28 when I adjust the slice A gain slider.

But no command at all is shown when I adjust the TX gain slider. ???? (If I click off the blue TX button I see C37124|stream remove 0x84000001, and if I click it on again I see C37126|stream create type=dax_tx)

I have also tried using the TXGain and Gain properties of a FlexLib DAXTXAudioStream object, but although I can get and set them, they have no effect.

Answers

  • David Decoons, wo2x
    David Decoons, wo2x Member, Super Elmer Moderator

    I may be wrong but I believe the slider changes the attenuation in Windows under sound devices, not in the radio.

    Dave wo2x

  • Howard K7JNX
    Howard K7JNX Member ✭✭

    Interesting idea (controlling TX level via Windows sound device volue), but this is apparently not the case. I tried bringing up System → Sound → All Sound Devices → Properties for DAX Audio TX. Manipulating the volume there has absolutely no effect on the level between e.g. WSJT-x and the Flex, nor does manipulating the SmartSDR DAX TX Gain Slider make any changes to the Windows DAX Audio TX device slider

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