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KXPA100 Application Notes

Application Notes Description
KXPA100 Kit Builder Alert: Operation with External Power Amplifiers The KXPA100/KX3 combination is designed to interface with the KPA500 amplifier. If another power amplifier is used that presents more than +5V on the keying line, damage may occur to KXPA100 amplifiers. Applies to KXPA100's with serial numbers less than 0700. Any amp after serial number 700 has this designed in as it left the factory. Applies to Kit and Factory-built KXPA100s.
KXPA100 Kit Builder Alert: Serial Data Noise Suppression Under certain conditions when the KX3 and the KXPA100 are connected to a personal computer via the PC port, noise from serial data may be audible in the receiver. This App Note describes an easy fix.
Elecraft KXPA100 + KX3 Power Calibration (Optional) The KXPA100 is factory calibrated to an Elecraft lab-standard KX3 transceiver, measuring and saving expected KX3 drive power for a given KXPA100 output power. This alignment is performed separately on each band and is generally accurate. 
Elecraft KX3 VFO Tuning Noise Suppression Modification The hardware modification described here is an alternative for those who have the KXFL3 module. In most cases the mod will reduce the noise on some bands, especially on 6 meters where it is the most noticeable. It is not guaranteed to reduce or eliminate noise, so you may still want to use the firmware techniques described above on some bands.