Hello Joel!
In the K3, the first 5 bars of the "ALC" bargraph indicator are just
audio level. Traditional ALC - reducing drive to to transmit strip to
control power level - does not occur until somewhere between the 5th and
6th bar. So the directions to have 4-5 bars of ALC just means that the
audio drive level to the DSP is at the correct level for the transmit
power control loop to work properly without introducing distortion from
the audio leveling control logic.
Underdrive it and you'll likely get creeping power levels as the MCU in
the K3 attempts to control peak power by adjusting the RF drive level in
the transmit path. Overdrive it and you may get some amount of
distortion from the transmit audio gain control loop within the DSP code.
The DSP code in the K3 that monitors, limits and reports audio drive
levels has not changed in years.
On 10/16/15 4:18 AM, Joel Black wrote:
...I have owned my K3 for several years. In that time, when using data modes in
DATA A, I have been told consistently to set ALC so that the fifth bar just
flickers...
I have read other groups / boards where folks are adamant about setting *every*
radio so that ALC is zero.
With the 5th bar flickering the "ALC" in the K3 *IS* zero in the sense
they are being so insistent about. ALC in the traditional sense does
not being until the 6th bar comes on.
73,
Lyle KK7P
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