GRT Avionics

The 10.1 has audio output pins in one of the D-sub connectors. Usually these wires have not been installed unless the builder has installed them or someone told their installer to install them. Wires have to be installed into the Connector "B" 25-pin D-sub on the back of the 10.1 display a...

You can leave the body in as long as it doesn't interfere with the safety operation. It is held in by red loctite so trying to remove it is not recommended. There are 2 more holes in the cylinder shear base that you can rotate under the arm. The shear screw is a custom part. You have to order it fro...

Usually the problem is that your web browser has changed the name of the file by adding numbers and dashes or parentheses. Many browsers now automatically rename the file if they know you've downloaded a file with the same name before. Check the name of the HHXRUp.dat file on your drive. If it has a...

Altimeter Calibration is described in the HXr User Manual in the Altimeter Calibration section. You can calibrate with just the field elevation and altimeter pressure setting (Partial) or from zero all the way up to your plane's maximum using a test set (Full). HXr Documentation: https://grtavionics...

There is no easy way to make them compatible. An EIS made with more current processor hardware (roughly since the year 2008-2009 and around serial number 19800) can be internally modified by us to do it.

The remote EIS doesn't have independent limits so that is something you can only do with a non-remote EIS.

Did you change the Tach Sensitivity (Tach1Sen) to High? Electronic ignition tach signals are often low voltage and require the High sensitivity setting.

1. Tach2 requires hardware and I think it was added in 2009 along with version 75.

Is it still holding courses and turning to new courses or is it also performing poorly? When the EFIS sends a bunch of commands to the servo in a short period of time but the plane doesn't respond, it issues a TRIM REQUIRED alarm. The roll servo doesn't measure force so the EFIS doesn't actually kno...

When you have two servos (roll and pitch) their outputs are connected together. The servos have a simple serial transmitter that's compatible with most modern RS232 receivers at 9600 baud. I think the main thing is the negative voltage is weaker. It allows one of them to drive the wire while the oth...

It's worse than that. Even when one is not sending it will still interfere and fight with the other trying to send data. Normal RS232 is always driving the output trying to force the wire to a specific voltage and that includes when idle. The only way to connect two outputs is to have a switch to se...