Elecraft KXPA100 Manual - Manual (Page 23)

23
Rear Panel Attenuator Switch
In addition to the front panel controls and indicators, there is a 3 dB ATTEN switch on the rear panel (see
Figure 8). This switch manually controls an attenuator at the amplifier input that reduces the drive power by
half. If the driving power exceeds 8 watts with the attenuator switch in the
OUT/AUTO position, the attenuator
switches in automatically for several seconds to protect the amplifier from unintentional, temporary excess RF
drive, but will switch out again automatically. The
IN position inserts 3dB attenuation at all times.
Figure 8. Attenuator Switch on Rear Panel.