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  #1  
Old 11-13-2019, 04:04 PM
Eddie P's Avatar
Eddie P Eddie P is offline
 
Join Date: Oct 2007
Location: Aptos, CA (previously Reno, 21 years!)
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Default ADSB antenna under baggage bay

Hi folks getting ready to drill the hole to mount my antenna for the ADSB (UAT Echo).

I recently had the seats and floors out for the CI. Wanted to install at that point but things got busy and ended up getting her all buttoned up to fly before I could install the antenna.

My transponder and VHF antennas are under the pilot seat floor area. Install guide says to keep 1 meter away from those antennas and the ADSB antenna. This leads to an idea to install the ADSB antenna in the wing inspection panel area, the nose area just behind the cowl, or in the aft bag bay floor area.

Are there any particulars that would be advisable to know about, that would have me avoid mounting the ADSB antenna under the bag bay? It would be to the aircraft left side... to the left of the elevator control bell crank structure. I?d simplify everything with the GPS antenna aft of the passenger seat and a single wire run from the avionics bay to the bag area.

The wings are slightly more problematic (though doable) since I have to use longer cable runs and find a new way to get cables out there.

Thanks!
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  #2  
Old 11-13-2019, 04:39 PM
RVDan RVDan is offline
 
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I have my ADS-B In antenna there. Works fine.
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  #3  
Old 11-14-2019, 05:37 AM
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Carl Froehlich Carl Froehlich is offline
 
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I mounted both the ADS-B antenna and receiver aft of the rear baggage compartment. The antenna aft of that bulkhead and the receiver just forward. The receiver is connected to the rest of the SkyView system via a single, four conductor shielded wire. The antenna lead is less than a foot long.

Fourth plane like this - works well.

Carl
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  #4  
Old 11-14-2019, 03:10 PM
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Eddie P Eddie P is offline
 
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Thank you Carl and Dan!
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  #5  
Old Today, 05:41 AM
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Saville Saville is offline
 
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When installing the ADS-B antenna behind the passenger seat - whether in the baggage area or on the top of the fuselage, what route do you take to run the wire from the antenna forward to the device (be it an GDL-82 or some other device).?

I took a cursory look Sunday and there didn't seem to be any clear routes.

Thanks
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  #6  
Old Today, 06:27 AM
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Carl Froehlich Carl Froehlich is offline
 
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For a retrofit, one option it to run it under the right longeron, like you run the static line under the left longeron.

Note - mount the antenna and ADS-B receiver aft of the baggage compartment, not under the floor of the baggage compartment. Do not mount the antenna on top of the fuselage.

Carl
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  #7  
Old Today, 06:33 AM
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Saville Saville is offline
 
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Quote:
Originally Posted by Carl Froehlich View Post
For a retrofit, one option it to run it under the right longeron, like you run the static line under the left longeron.

Note - mount the antenna and ADS-B receiver aft of the baggage compartment, not under the floor of the baggage compartment. Do not mount the antenna on top of the fuselage.

Carl
Are you talking the lower longerons?

Why should we not mount the antenna on the top of the fuselage aft of the Pax seat (under the canopy but aft enough so the bar clears it when you close the canopy)?
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Old Today, 06:56 AM
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Carl Froehlich Carl Froehlich is offline
 
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Quote:
Originally Posted by Saville View Post
Are you talking the lower longerons?

Why should we not mount the antenna on the top of the fuselage aft of the Pax seat (under the canopy but aft enough so the bar clears it when you close the canopy)?
Upper longerons.

Not mounted on top of the fuselage for the same reason you don't mount your transponder antenna on top of the fuselage. For that matter I don't know of an ADS-B antenna with a low enough profile to allow the canopy frame to slide over it.

The only thing I mount on top of the fuselage is the GTN-650 GPS antenna, just aft of the rear passenger seat and under the canopy. I mount it there only because the GTN-650 is finicky on where you mount the GPS antenna.

Carl
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  #9  
Old Today, 07:00 AM
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Quote:
Originally Posted by Carl Froehlich View Post
Upper longerons.

Not mounted on top of the fuselage for the same reason you don't mount your transponder antenna on top of the fuselage. For that matter I don't know of an ADS-B antenna with a low enough profile to allow the canopy frame to slide over it.

The only thing I mount on top of the fuselage is the GTN-650 GPS antenna, just aft of the rear passenger seat and under the canopy. I mount it there only because the GTN-650 is finicky on where you mount the GPS antenna.

Carl
My apologies...I was thinking "GPS antenna" and you were speaking ADS-B antenna.

Now what you say makes sense to me.

I would like to mount the GDL-82 puck on the fuselage behind the passenger seat.
However I looked at running coax along the upper longeron Sunday and the pathway seemed stopped by the front seat fixture - the fixture against which the top of the front seat rests.
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Last edited by Saville : Today at 07:07 AM.
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  #10  
Old Today, 08:23 AM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
 
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Gregg,

I'm not familiar with the GDL-82 setup, so I looked at the install manual. It seems to me this is an clunky way to get ADS-B, but I guess you have reason to do so.

For running the coax, there are tooling holes in the mid cabin support bar brackets (front seat bar) to use.

Carl
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