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  #1  
Old 09-26-2014, 03:13 PM
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TMann TMann is offline
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Default ELT Antenna in Composite Aircraft

Okay, so I've got the new style ELT.

Believe it or not, the plane (which has 85 hours on it) did not have an ELT.

I bought the new version (406 satellite & 121.5 civilian) and will be installing it tomorrow. I would like to add a foil antenna but the question is what size legs and at what orientation?

I'm assuming that if the civilian frequency is a comm that the usual 20.3" will work for each leg but what about the satellite band? Do I need something different for that?
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Last edited by TMann : 09-26-2014 at 03:54 PM.
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Old 09-26-2014, 05:42 PM
NeilK NeilK is offline
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Default Re: ELT Antenna in Composite Aircraft

Jim Wier is the best person to ask about this. http://www.rst-engr.com

I did snag this from another site...

http://www.matronics.com/forums/view...1ca5ac45ec04b3
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Old 09-26-2014, 06:45 PM
gisnar gisnar is offline
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Default Re: ELT Antenna in Composite Aircraft

I used the antena that came with the 406 ELT, placed it behind the seat on my longeze. Constructed a ground plane from copper foil that I got from a local hobby store. Local avionics shop said it broadcasts just fine, hope never to find out for real.
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Old 09-26-2014, 07:07 PM
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TMann TMann is offline
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Default Re: ELT Antenna in Composite Aircraft

The unit comes with 2 antennas. One is as a portable (handheld), and the other is a whip for remote mounting.

I'm now considering mounting the whip horizontally in the engine compartment using the stainless firewall as the ground plane. I have to check to make sure the cowl is Fiberglass vs. Carbon Fiber. I also need to verify that a horizontal mount will still work.
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Old 09-29-2014, 10:10 AM
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Default Re: ELT Antenna in Composite Aircraft

Quote:
Originally Posted by gisnar View Post
I used the antena that came with the 406 ELT, placed it behind the seat on my longeze.
Any pics?
Did you mount it vertical up the back? I'm trying to picture how you did this. If I did t the way they illustrate it, I would have it in the floor with 6 lengths of foil 60 degrees of separation and the antenna sticking straight up. I don't think that is the answer that I'm looking for.

I saw a nice example of an antenna that was foil but I don't think that is considered to be a TSO'd installation.

The instructions that came with mine had conflicting information.
One part has the following:
2.2.2 ANTENNA LOCATION AND INSTALLATION
In order to meet the requirements of TSO-C91a and FAR 91.207, an External Antenna must be used. The Portable Antenna (if supplied) with the unit is for use only after the unit has been removed from the aircraft.

While another section has this:
2.2.2.2.4 Integral Antenna Installation: (AK 451.017-4(S))
The integral Antenna AK 451.017-4(S) is fastened to the ELT-(AP) with Integral Antenna, ELT-(S). This Antenna required no ground plane. The antenna ground plane installation is not required.
Type of aircraft:
The AK 451.017-4(S) Integral Antenna is designed for installation for any aircraft including fix wing and helicopters.
Installation:
Installation is not required.
The AK-451 (AP) with Integral Antenna and AK-451-(S) are the best ELT configurations for composite aircraft because the Antenna ground plane is not required.


The manufacturer's instructions present a mutually exclusive set of directions.
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Long-EZ/20B Infinity R/G Chpt 18
Velocity/RG Restoration
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Last edited by TMann : 09-29-2014 at 10:49 AM.
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