The pulsating is the result of the refresh rate of the display and the
1500 Hz tone. Change the TUNE tone to a non- 500 Hz interval such as
1250 Hz. or 1700 HZ as such. Yes, in FLDIGI the TUNE tone is a single
frequency you have selected on the waterfall scale or in the box at the
bottom of the screen.
When you setup and adjust the audio levels, the radio mode must be DATA
A for PSK-31. The audio level for correct ALC indication should show 4
bars solid with the 5th bar flashing. The Elecraft radios DO NOT
operate like other brands in regards to the ALC indications. The
actual ALC in the Elecraft starts at and after the 5th bar on the ALC
scale. Before that the "audio level" is indicated. Then set the PWR
knob on the radio for the power output you desire. DO NOT adjust the
audio level to change power.
There are 3 places where audio level is controlled and each one needs to
be correct. First is the SPKR level out of the computer. This should
be about 30% {-18 dB} or so. Then output attenuation on the lower
right of FLDIGI which should be about -10 dB to -15 dB . Then the Line
Gain on the radio {adjusts by the MIC knob} to about 30. These are
"ball park" numbers and should get you up and running with a clean
signal. If any one or more is near minimum or near maximum, you need
to investigate further.
If needed I can send screen captures.
73
Bob, K4TAX
On 6/25/2019 2:42 PM, Kevin, N4TT wrote:
I've made a few PSK-31 contacts on the K3s and I've not gotten any bad
reports. However, I'm still a little concerned about what I see for ALC.
The video below (no audio) shows the ALC meter responding first to a "TUNE"
command from fldigi. This sounds like a pure tone in the headphones but the
ALC meter responds oddly, almost like it is pulsating. I expected ALC to
pretty much be steady.
Next in the video is just clicking T/R in fldigi with no typing. It sounds
as expected in the headphones (a trilling sound). The ALC response looks
better but I can still see the pulsations in there. I expected to see 4
bars solid and the 5th flashing.
https://photos.app.goo.gl/4AaLaVu1r8UDv5LT9
Am I reading too much into this? Is this how your K3s responds?
I'm using the K3s sound card. Level in Windows is -14.7 dB. Level in fldigi
is -12.7 dB. The level control on the K3s is set for 18.
73,
Kev N4TT
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