Pace makers operate at higher frequencies than generally used Ham radio. Also pace makers are encrypted making them relatively immune to spurious RF and hackers. Also many newer models are MRI certified. MRI operate with RF that can get much high power than Ham Transmitters with frequency ranging near most Ham radio and general broad cast bands depending on the gyro magnetic ratio-- not to mention the high magnetic field. It is best to check with the pace maker mfg referencing the model number on your Pace maker ID card to set your mind at ease. I doubt they will be a problem with Ham transmitters. However some are not MRI certified-- depending on the mfg and date.