Garmin, Narco and Becker offer fully solid-state options that fi t most any panel. Just don’t skimp on the budget for installation and interface.

By Larry Anglisano

While transponder replacement ranks near the bottom of most owners’ upgrade list, eventually—and often unexpectedly—you’ll be writing a check for a few grand on a transponder upgrade. You’ll likely rely on your shop’s recommendation for replacement options but there are several issues and a handful of models to consider. A proactive replacement may even be warranted given the modern technology found in many new models.

Here’s a review of the current market offerings in ATC transponder gear and a review of the important accessories that should be addressed during installation. Think Long-Term …