Hi Richard,
comments in line below.
On 08/07/2017 17:15, Richard Shaw wrote:
Should I not be using the Mic input and use Line In instead? Will the
results be different?
Probably yes. The mic input (may be the same socket as the line in
input) usually has significant gain applied before the ADC, usually via
a stepped gain stage with something like 10dB, 20db and 30dB steps.
Probably by switching two op amps in series with 10db and 20dB gain
respectively. You don't want any of that stuff if you are feeding a line
level to your sound card input.
I'm even less sure what to do about the playback volume.
Application based playback volume set to 100% (0dB)
Output Device -> Line out volume set to ~50% (-19dB)
WSJT-X Pwr slider set about 6 notches down from the top to get ~20w out.
Same advice apply in reverse. Set all digital gain controls to 0dB FS
and use an analogue control that is after the DAC. The rig mic gain (or
DATA input level in the rig menu) and power controls are good candidates
for setting your transmitted power. You should only really consider
using the Pwr slider to reduce output more than the analogue controls
allow. Again it is not critical but the more digital attenuation you
apply (or gain) the more the resolution of your transmitted waveform is
decreased.
73
Bill
G4WJS.
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