The Smart Coupler II converts the digital information coming out of the hand-held GPS to the analog error signal used by the NAVAID Autopilot.  This device was developed by Porcine Associates.  It is available as an external add-on from Porcine Associates or built in to the autopilot from Navaid Devices.

Using a dedicated microprocessor, the Smart Coupler strips cross-track error information from a string of alpha-numeric characters generated by the GPS at intervals of one to two seconds.  The sensitivity of the converted output signal is fixed at ± 150 millivolts (0.15 volts) at a full scale of 1.25 miles.  The output is buffered so that it can drive both the autopilot and, if you wish, and external CDI.  The sensitivity of the CDI needle will be the same, i.e. 0.25 miles per dot, or 1.25 miles full scale.

The Smart Coupler II has an external momentary-contact switch that allows the pilot to select whether to use course or ground track (heading) data.

PERFORMANCE

The performance of the Navaid autopilot with the GPS coupler should be indistinguishable from that obtained with a panel mounted GPS set to the same 0.25 miles/dot sensitivity.  This means that a course change of 90° at a waypoint is accomplished gracefully with minimal overshoot (one or two zero-crossings) in settling to the new course.

AVAILABILITY

The Smart Coupler II is an option built into the autopilot, available from Navaid.   Or for a retrofit add-on please contact Jim Ham at Porcine Associates.

GUARANTEE

The guarantee on the autopilot includes the coupler.  This means that we unconditionally agree to refund the full purchase price of the coupler if you are not satisfied with its performance.

SELLING PRICE

The Smart Coupler II is a $150.00 option to the autopilots base price of $1300.00.   The price of the external unit is determined independently by Porcine Associates.