The 100 Watt PA module simply converts the QRP version into a standard QRO HF radio, QRP is still possible when the power level is reduced, thus making the K3 able to do double-duty as a QRP/QRO radio. In fact, the front panel display automatically switches between the 1-10 watt and the 1-100 watt scales when the K3 switches from the low power IPA to the higher power unit, nice feature Elecraft!
