On 8/8/2015 2:31 PM, Lyle Johnson wrote:
In addition to Joe's excellent advice, you may need to set the Tx output
level for the soundcard in DM780 to a higher-than-default level. In the
DM780 version I have on my computer, I have the Transmit Level sliders
for Master and Wave both set to about 70.
Not yo pick on Lyle ... only to piggyback on the thread ... given some
of the gross misinformation about sound cards and Windows around these
days, when you set up your sound card, right click on the "microphone"
and/or "Speaker" sliders in the Windows Sound control panel and select
"dB" for the scale. Once you do that, the best starting points are
0.0 dB for *inputs* (mic and/or line) and -3.0 dB for *outputs*
(speaker or headphones). Those levels reflect the driver settings and
tend to be independent of sound card brand.
At 0.0 dB for the input, the sound card is not providing further gain
for the input signal which minimizes the chances of overflowing the
ADC input. Similarly, most sound cards are much "cleaner" at 3 dB or
more below maximum output (that's typically 80 to 83 percent). If
the rig has sufficient gain, I tend to prefer -6.- dB (67%) since some
of the "inexpensive" USB powered sound cards lack proper regulation and
bypassing which makes them very dirty at maximum levels.
73,
... Joe, W4TV
With that, my K3 (S) LINE (IN) gain is set to 23 for 4-5 bars of ALC
using PSK31.
YMMV,
73,
Lyle KK7P
On 8/8/15 6:36 AM, Joe Subich, W4TV wrote:
> Any other ideas??
Are you using MODE=DATA and data sub-mode=DATA_A?
> MIC SEL was set to Line In I changed it to FP
>
> MIC+LIN was set to NA and I set it ON and the MIC level is set to 60.
Set MIC+LIN back to OFF, set Mic SEL back to Line In, place DM780 in
PSK31 transmit and adjust the Mic Gain (actually Line Gain in DATA_A)
for four bars of ALC with the fifth just flickering then adjust PWR Out
for no more than 50W.
73,
... Joe, W4TV
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