AP74/HS34 Installation

[bule]

I have installed the AP74 and HS34 on my RV6A. Wiring harness fabricated by SteinAir for my particular installation. I have a Garmin 250XL and a Garmin 496 connected to the HS34.
Both Units appears to be feeding the HS34 simultaneously and obviously confusing the AP74 regardless of the NAV source selected (1 or 2). Is there something internal to the HS34 that would allow this to happen?
On a separate note, I seem to have the ALT hold sensitivity adjusted to where it maintains altitude without oscillating. However, maintaining directional control in any mode is either too jittery or sluggish. The nose tends to wonder or jerk to maintain heading. Maybe it is confused by the dual feed problem above?
One final question, it seems as though the auto pilot wants to intercept a selected course at 90 degree angle and max bank angle even if the course selected is 10-15 degrees off heading. Is this normal?

 

[dynonsupport]

You can display bearing pointers from both devices simultaneously when you have the HS34 (you can change what the BRG pointers are sourcing on the fly, as described in the manual), but the main indicator - the CDI - should remain with one NAV source at a time. Are you saying the CDI is changing, or just that you're seeing both BRG sources?

On you AP issues - do you see this in both HDG and TRK mode, or just HDG? If just HDG, then improving the compass calibration may help. Also, what are all the settings you're using for on your roll servo?

Autopilot intercepts should max out at a 45 degree angle of course, though it may take a few moments to stabilize the intercept course. Can you take a picture of the EFIS+HSI screen in action when it's doing this? Also, confirm you're talking about NAV mode when you're seeing this.

 

[bdirdal]

Hello
I do have the HS34 installed together with EFIS D100 as I needed this as exspansion. I plan to install Auto pilot and then need the AP74, can I replace the HS34 with the AP74 and still have the espansion possibillity with the HS74?
This due to lack of space in my panel.

Regards
Borge

 

[Dynon]

Borge - I'm not sure I understand the question here. But basically, think of the HS34 as a device that can handle multiple inputs, including ARINC-429 sources. It also has controls that are centered around manipulating those external navigation sources. In contrast, the AP74 is centered around providing external autopilot controls. So they're not really interchangable. But in other words - which expansion capability of the HS34 are you referring to as the one that you needed?

 

[bdirdal]

I use the HS 34 to control EDC-D10A compass and nothing else.
Can that be done with the AP74?

 

[Dynon]

Do you mean that you only use it to adjust the heading bug? If so, yes, the multipurpose knob on the AP74 can be used to adjust the heading and altitude bugs, and also the baro setting.

 

[bdirdal]

Thanks

 

[bdirdal]

One more question, I will change out the HS34 with the AP74 module. looks like I can use the same D25 connector to connect to direct to my new AP74 module without changing any pins?
Please confirm.

Thanks

 

[jakej]

Come on Borge : be fair, YOU need to check that, it’s just a simple read of the pin outs for each connector. Surely you have the time to do that easy simple job?

 

[Dynon]

The power, DSAB, and audio pinouts are the same, but you'll want to do a full comparison on the electrical connections using the installation guide to make sure you fully understand how everything transfers over.

 

[bdirdal]

Thanks, i will[ch128077]