Interface with S-Tec-30
Posted: Wed Mar 01, 2017 3:33 pm
I have my Mini-AP connected to my S-Tec-30 via the GRT ARINC interface to the S-TEC-30 ARINC interface through a switch that allows me to choose between the Mini-AP and the 430W.
The 430W recently replaced a 420W and the interface between it and the S-Tec-30 works very well.
The Mini-AP however does not work as well as I think it should...allow me to explain:
Using the Mini-AP Heading-bug mode (in a manner similar to the NSD-1000 HSI that the Mini-AP recently replaced), when I select a heading greater than 45 degrees (or so) away from my current heading, the commands from the Mini-AP to the S-Tec-30 provide for a standard-rate turn until the heading gets to within 20 degrees of the new selection - at which point the Mini-AP commands half-standard turn rate for about ten degrees - then takes an excruciatingly long time to close on the selected heading.
The NSD-1000 would command standard-rate turn to a smooth rollout within the last few degrees. Granted, this is using the analog heading mode of both the NSD-1000 and the ARINC interface for the S-Tec-30.
The 430W (when I perform a similar 45 degree course change) commands a standard-rate turn to a smooth rollout within the last few degrees. This uses the same ARINC adapter that the Mini-AP's ARINC adapter is attached to so I know that the 430W to S-Tec-30's ARINC adapter's ARINC signal stream can command the desired turn rate and rollout.
Since the ARINC interface is data-stream based, it seems as though the output from the Mini-AP adapter is not the same as the output from the 430W.
Anyone else running a S-Tec-30?
Anyone else experienced this with a different autopilot?
Anyone want to educate me on ARINC interfaces if my understanding is incorrect?
Thanks,
Ralph Capen
The 430W recently replaced a 420W and the interface between it and the S-Tec-30 works very well.
The Mini-AP however does not work as well as I think it should...allow me to explain:
Using the Mini-AP Heading-bug mode (in a manner similar to the NSD-1000 HSI that the Mini-AP recently replaced), when I select a heading greater than 45 degrees (or so) away from my current heading, the commands from the Mini-AP to the S-Tec-30 provide for a standard-rate turn until the heading gets to within 20 degrees of the new selection - at which point the Mini-AP commands half-standard turn rate for about ten degrees - then takes an excruciatingly long time to close on the selected heading.
The NSD-1000 would command standard-rate turn to a smooth rollout within the last few degrees. Granted, this is using the analog heading mode of both the NSD-1000 and the ARINC interface for the S-Tec-30.
The 430W (when I perform a similar 45 degree course change) commands a standard-rate turn to a smooth rollout within the last few degrees. This uses the same ARINC adapter that the Mini-AP's ARINC adapter is attached to so I know that the 430W to S-Tec-30's ARINC adapter's ARINC signal stream can command the desired turn rate and rollout.
Since the ARINC interface is data-stream based, it seems as though the output from the Mini-AP adapter is not the same as the output from the 430W.
Anyone else running a S-Tec-30?
Anyone else experienced this with a different autopilot?
Anyone want to educate me on ARINC interfaces if my understanding is incorrect?
Thanks,
Ralph Capen