|
-
POSTING RULES

-
Donate yearly (please).
-
Advertise in here!
-
Today's Posts
|
Insert Pics
|

04-07-2009, 11:20 AM
|
|
|
|
Join Date: Feb 2008
Location: Thousand Oaks, CA
Posts: 183
|
|
Trutrak Digiflight IIVS question
I have not even set up my autopilot yet but it is installed. I turned it on today and the heading said 125. I keyed my mic and the heading swung pretty large like 40 degrees. Does this mean I the wires to the servos are too close to my comm antenna cables?
|

04-07-2009, 11:45 AM
|
 |
|
|
Join Date: Feb 2005
Location: Huskerland, USA
Posts: 5,862
|
|
It must. When I keyed my mic the oil pressure shot up 40 PSI.....until I moved the wire away from the coax.
__________________
RV-7 : In the hangar
RV-10 : In the hangar
RV-12 : Built and sold
RV-44 : 4 place helicopter on order.
|

04-07-2009, 12:11 PM
|
|
|
|
Join Date: Mar 2008
Location: Springdale, AR
Posts: 547
|
|
RF Interference
You are definitely getting some strong RF interference into the AP to affect the azimuth gyro. Try moving your comm antenna wires as was suggested by Geico266. Let me know if you have any further trouble.
|

04-07-2009, 12:21 PM
|
 |
|
|
Join Date: Jan 2005
Location: Louisville, Ga
Posts: 7,840
|
|
An earlier poster had problems....
....while he was in the hangar. It was suggested that RF could be bouncing off walls, roof, etc and to take it outside.
Regards,
__________________
Pierre Smith
RV-10, 510 TT
RV6A (Sojourner) 180 HP, Catto 3 Bl (502Hrs), gone...and already missed
Air Tractor AT 502B PT 6-15 Sold
Air Tractor 402 PT-6-20 Sold
EAA Flight Advisor/CFI/Tech Counselor
Louisville, Ga
It's never skill or craftsmanship that completes airplanes, it's the will to do so,
Patrick Kenny, EAA 275132
Dues gladly paid!
|

04-07-2009, 12:23 PM
|
 |
|
|
Join Date: Jun 2005
Location: Cedar Park, TX
Posts: 3,156
|
|
Also, be aware that funny things happen with RF inside the garage or hangar that very well may not occur outside.
__________________
Scott Card
CQ Headset by Card Machine Works
CMW E-Lift
RV-9A N4822C flying 2200+hrs. / Cedar Park, TX
RV8 Building - fuselage / showplanes canopy (Done!)
|

04-07-2009, 01:18 PM
|
|
|
|
Join Date: Dec 2006
Location: Atlanta, GA
Posts: 1,231
|
|
Most folks who see something funny happen on the TT autopilots experience pitch, not heading, problems.
Make sure you use the latest recommendation for coax (RG58 is no longer considered the right choice); run your antenna wire away from other wires if possible; make sure you have good grounds; etc.
If you still experience problems after all of that, you might check out this thread on the TruTrak forum. $20 has provided a solution to RF/AP interference in a few reported cases now.
|

04-07-2009, 03:33 PM
|
|
|
|
Join Date: Feb 2008
Location: Thousand Oaks, CA
Posts: 183
|
|
Thanks
I ordered that part from Digikey. Thanks for the link. I am going to pull my comm coax out of the bundle and try and separate it from the other wires which is very hard considering the amount of space I have.
I really cant understand why the guy that wired my airplane, which has done many lancairs, bundled all my coax cables along with everything else and still claims he has never had a problem doing it this way. 
|

04-08-2009, 08:03 PM
|
|
|
|
Join Date: May 2006
Location: Woodland, CA
Posts: 104
|
|
Quote:
Originally Posted by pierre smith
....while he was in the hangar. It was suggested that RF could be bouncing off walls, roof, etc and to take it outside.
Regards,
|
It does. I've measured the VSWR, as well as, the transmitted and reflected power directly, both inside and out. The difference is quite dramatic.
__________________
Chris Zavatson
N91CZ
Lancair 360
http://www.n91cz.com/
|
| Thread Tools |
Search this Thread |
|
|
|
| Display Modes |
Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
All times are GMT -6. The time now is 06:54 AM.
|