Nate:
You should run your MIC gain such that you see 4 bars of ALC with the
5th just flickering occasionally on voice peaks. Make this adjustment
with compression at zero. Then, adjust the compression as desired. I
generally set it so that voice peaks show 10 dB compression. The first
4 bars on the ALC display are in fact just a VU meter. ALC action
begins at the 5th bar. Elecraft transceivers set the power out with a
closed feedback loop [PWR setting], not the MIC gain.
Driving the ALC too hard will create IMD which, among other things, will
show up as energy on the opposite sideband. It all happens in the RF
chain after the DSP has generated the SSB.
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
On 8/28/2019 9:40 AM, Nate Bargmann wrote:
I received a note this morning advising that I should check my ALC as he
is seeing some energy on USB when I check into a 75m voice net on LSB.
I am using an MC-50 microphone and am running the mic gain at 35 and the
compression at 11. My thinking was that generating opposite sideband
energy would be quite difficult with the K3's DSP. Am I wrong?
I'll try working with him some morning and back down the mic gain a bit
and see what that does for him.
73, Nate, N0NB
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