[Elecraft] ALC implementation

[Joe Subich, W4TV]

Among other issues, this article is incorrect when calling for the
"Device" (Master) volume level in Windows to be set to 100%.  Nearly
every sound card for which I've seen test results has increased
distortion above the 70 - 80% level (-1 to -2 dB or -3 to -6 dB
depending on the driver calibration) and some "inexpensive" devices
have significant distortion above 50% (-3 or -10 dB depending on
driver calibration).

One will have a cleaner signal, all other things being the same, by
setting the Windows "Device" (Master) slider down a bit and increasing
the transceiver mic gain (Line In, DATA In, etc.) slightly.  In most
cases, with the sound card "Master" at 70 - 80%, the transceiver mic
gain will still be relatively low.

73,

    ... Joe, W4TV


On 2019-06-28 10:18 AM, Andy Durbin wrote:
> Does anyone know of any rig that uses "compression" rather than linear gain control to implement ALC?
> 
> ref - https://www.dropbox.com/s/f4uaop5tqwzaweu/FT8Noise6.docx?dl=1
> 
> 73,
> Andy, k3wyc