Transmit ALC and Per-Band Power Control
To eliminate transmit splatter, all ALC in the K3S is applied before the narrow first-I.F. crystal filter. However,
with some vocalizations, speech energy may build up within a narrow crystal filter to produce a slight peaking
effect. Because of this, the user should set the transceiver’s power output level such that it peaks at or below the
safe level for any external amplifier under all speech conditions.
To facilitate this, optional per-band power control can be used (see CONFIG:PWR SET). This compensates for
per-band gain variation in the external amp or the K3S itself, reducing the need for ALC. For example, all
crystal filters have a small amount of ripple (typ. +/- 0.5 to 1.0 dB) that can result in a slight difference in
average power output between LSB and USB with some voice characteristics. But since you typically use only
one of the two sidebands on a given ham band, per-band power control can conveniently compensate for small
variations.
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