COM Radio Antenna Proximity to ADAHRS

[Grumpy-Hodge]

Hey folks,
I am installing the ADAHRS module aft of the baggage bulkhead in the RV-9A and underneath the upper longerons (a common place to install).  I am considering installation of a COMM antenna on the aft, top fuselage behind the slider canopy when in the open position.  Is there a minimum distance requirement between the COMM antenna and the ADAHRS module?

Thanks,
Grumpy.

 

[jakej]

Antennas close (close as 1 ft) to the ADAHRS works on all installations I've done on RV's, the skin is doing it's job of shielding

JakeJ

 

[TerryD5120]

I got excited when I saw Grumpy's question concerning comm antenna proximity to the ADAHRS as I have the same question but for a GlaStar. I am considering installing a copper foil dipole antenna on the inside fibreglass wall of the tail cone near the ADAHRS location. The foil would be parallel to the wiring to the ADAHRS. Any thoughts or knowledge as to the possibility of interference appreciated.

Terry
Australia

 

[jakej]

Terry

PM me with your ph # or email & we can discuss this at length. I have a Glasair so I know your concern

Jake J

 

[dynonsupport]

I have a Glasair Sportsman. One of the COM antennas is a copper foil antenna on the inside of the fuse. It's less than a foot away from the dual AHRS units at the closest point. Never had an issue. The wires for the AHRS do run away from the antenna perpendicular for about 1 foot, and then they parallel the antenna for a good 3' run.

 

[TerryD5120]

That's good to know! Bulkhead A is usually aluminum, doesn't that affect the antenna performance in that direction?

Also, what brand of antenna is it? Perhaps the Archer SA006 or the AAE 5T?

Thanks,

Terry.

I have a Glasair Sportsman. One of the COM antennas is a copper foil antenna on the inside of the fuse. It's less than a foot away from the dual AHRS units at the closest point. Never had an issue. The wires for the AHRS do run away from the antenna perpendicular for about 1 foot, and then they parallel the antenna for a good 3' run.

 

[dynonsupport]

The bulkhead in the Sportsman is composite, so it doesn't cause an issue. The cage inside does cause a bit of an issue for things straight ahead. This is my backup radio antenna, the main one is in the vertical stab.

I don't know who makes it. It's sold by Glasair as PN 211-0112-501.